DE102006062219A1 - Vibration type measuring transducer for use in e.g. coriolis-mass flow measuring device, has two wired points arranged such that relative distance between points remains unchanged also with vibrating measuring tube - Google Patents

Abstract

The transducer has a vibrating measuring tube conducting a medium, and a counter oscillator (20) fixed at an inlet-side of the measuring tube by formation of a coupling zone. A sensor arrangement (50) is held at the counter oscillator for detecting vibrations of the measuring tube. An exciter arrangement (40) is held at the counter oscillator for moving the measuring tube, and two wired points are arranged such that a relative distance between the points remains unchanged also with the vibrating measuring tube.

Description

The The invention relates to a, especially for use in one Coriolis mass flow meters suitable, transducer of the vibration type.

In order to determine parameters, for example a mass flow rate, a density, a viscosity etc., of media flowing in a pipeline, for example liquids and / or gases, in-line measuring devices are used, in particular as Coriolis mass flowmeters, the forces by means of a transducer of the vibration type and a connected thereto operating and evaluation, in the flowing medium forces, such as Coriolis forces, induce and derived from these generate the at least one parameter corresponding to representative measurement signal. Such in-line gauges with a vibration-type transducer have long been known and have become equally established in industrial use. So z. B. in the EP-A 317 340 , of the US-A 53 98 554 , of the US-A 54 76 013 , of the US-A 55 31 126 , of the US-A 56 91 485 . US-A 57 05 754 , of the US Pat. No. 5,796,012 , of the US-A 59 45 609 , of the US-A 59 79 246 , of the US-A 60 06 609 , of the US-B 63 97 685 , of the US-B 66 91 583 , of the US-B 68 40 109 , of the WO-A 99 51 946 . WO-A 99 40 394 or the WO-A 00 14 485 , Coriolis mass flow meter, each with a vibration transducer described. Each of the transducers shown therein comprises a single straight, in operation vibrating measuring tube for guiding the medium, which communicating tube communicates with the pipe via an inlet pipe branching in on the inlet side and an outlet pipe piece exiting on the outlet side, and an exciter arrangement which operates the measuring pipe by means of at least one thereof acting electromechanical, esp. Electro-dynamic, vibrator excites to bending vibrations in a tube plane, and a sensor arrangement with, esp. Electro-dynamic, vibration sensors for at least selective detection of inlet-side and outlet-side vibrations of the measuring tube and for generating mass flow influenced by the electrical sensor signals. In addition, each of the transducers shown, esp. Directly on the inlet tube piece and the outlet tube piece fixed, the measuring tube with counter-oscillator coupled thereto and the intended excitation and sensor arrangement enclosing converter housing. In addition to the measures provided for detecting vibrations of the measuring tube vibration sensors, the transducer, as, inter alia, in the EP-A 831 306 , of the US-B 70 40 179 , of the US-A 57 36 653 , of the US-A 53 81 697 or the WO-A 01/02 816 proposed, even more, esp. The detection of rather secondary measures such. As temperature, acceleration, strain, tension, etc., serving on the inner part arranged sensors.

Just measuring tubes known to cause bending vibrations according to a first natural vibration form - the so-called Drive or payload mode - stimulated, in the flowing medium Coriolis forces. These in turn lead to that the excited bending vibrations coplanar bending vibrations according to a second natural mode of higher and / or lower order - the so-called Coriolis fashion - superimposed and accordingly the inlet side by means of the sensor arrangement and outlet side detected Vibrations also have a mass flow dependent, measurable phase difference. Usually become the measuring tubes such, especially used in Coriolis mass flow meters, transducers in Nutzmode at a momentary resonance frequency of the first natural mode, esp. At constant-controlled oscillation amplitude, excited. There this resonant frequency esp. Of the current density of the Medium dependent is, can by means of market Coriolis mass flow meter alongside the mass flow at least also the density of flowing Media can be measured directly.

One Advantage of straight measuring tubes exists z. B. in that they practically in any mounting position, especially after one carried out in-line Cleaning, to be emptied residue-free with high security can. Furthermore, such measuring tubes in comparison z. B. to an omega-shaped or helically curved measuring tube much easier and therefore cheaper to produce. Another Advantage of a vibrating in the manner described above, straight measuring tube is compared to curved measuring tubes z. B. also in it see that in the Measurement mode via measuring tube Virtually no torsional vibrations in the connected pipeline be caused. In contrast, there is a particular problem of above-described transducer in that, because of Mutual lateral deflections of the vibrating single Measuring tube equal frequency oscillating shear forces can act on the pipeline, and that this transverse forces so far only very limited and only with a very high technical Expense can be compensated.

To improve the dynamic balance of the transducer, esp. To reduce such generated by the vibrating single measuring tube, the inlet side and the outlet side acting on the pipe transverse forces include those in the EP-A 317 340 , of the US-A 53 98 554 , of the US-A 55 31 126 , of the US-A 56 91 485 , of the US Pat. No. 5,796,012 . US-A 59 79 246 . US-A 60 06 609 , of the US-B 63 97 685 , of the US-B 66 91 583 , of the US-B 68 40 109 or the WO-A 00 14 485 each transducer shown at least one integral or multi-part counter-oscillator, which is fixed on the inlet side to form a first coupling zone on the measuring tube and the is fixed to the measuring tube on the outlet side to form a second coupling zone. Such bar-shaped, esp. Tubular, or realized as aligned with the measuring tube body pendulum swinging oscillate in operation for each measuring tube out of phase, esp. Inphasic, whereby the effect of the measuring tube and counter-oscillator respectively caused lateral shear forces and / or transverse pulses minimized to the pipeline and possibly also be completely suppressed.

at mark popular transducers with a single measuring tube and a counter-oscillator coupled thereto is the vibration generator the exciter arrangement by means of at least one usually on the counteroscillator fixed, at least at times by a current traversed and at least temporarily by a magnetic field interspersed coil and one on the measuring tube fixed, cooperating with the at least one coil anchor educated. For most transducers of the type described are the vibration sensors of the sensor arrangement constructed according to the same principle as the aforementioned vibration exciter. Accordingly, the vibration sensors of such a sensor arrangement usually by means of a coil by means of at least one usually fixed on the backswing, at least temporarily by a stream traversed and at least temporarily interspersed by a magnetic field Coil and one on the measuring tube fixed, cooperating with the at least one coil anchor educated. Each of the aforementioned coils is also by means of at least a pair of electrical leads with the mentioned operating and evaluation of the in-line meter connected. The connection lines are common on as possible short ways from the coils over guided the counteroscillator towards the converter housing.

Transducers of the type described with a single measuring tube and counteroscillator have esp. In such applications proven in which the medium to be measured has a substantially constant or only to a very small extent variable density, ie in such applications in which one on the connected Pipe-acting resultant from the transverse forces generated by the measuring tube and the opposing forces generated by the counteroscillator can be easily set to zero in advance without further notice. In contrast, such transducers, esp. In accordance with the US-A 55 31 126 or the US-A 59 69 265 when used for media having a wide range of varying density, e.g. B. different, successively to be measured media, albeit to a lesser extent, practically the same disadvantage as transducers without counteroscillator because the aforementioned resultant are also dependent on the density of the medium and thus can be different from zero to a considerable extent. In other words, even by at least the measuring tube and the counteroscillator formed inner part of the transducer is globally deflected during operation due to density-dependent imbalances and concomitant lateral forces from an assigned static rest position.

One way to reduce density-dependent shear forces is z. B. in the US-A 52 87 754 , of the US-A 57 05 754 , of the US Pat. No. 5,796,010 or the US-B 69 48 379 described. In the transducers shown there are generated by the vibrating single measuring tube, rather medium or high frequency oscillating transverse forces by means of a very heavy counterweight compared to the measuring tube and possibly a relatively soft coupling of the measuring tube to the pipeline, so practically by means of a mechanical low pass, from the pipeline, kept away. However, a major disadvantage of such a transducer is, inter alia, that the mass of the counter-oscillator required to achieve a sufficiently robust damping increases disproportionately with the nominal diameter of the measuring tube. Conversely, when using such a massive Gegenschwingers but also ensure that with increasing mass ever lower minimum natural frequency of the transducer is still far away from the also very low natural frequencies of the connected pipe. Various further possibilities for reducing the density-dependent transverse forces, z. B. in the US-A 59 79 246 , of the US-B 63 97 685 , of the US-B 66 91 583 , of the US-B 68 40 109 , of the WO-A 99 40 394 or in the WO-A 00 14 485 proposed. In the compensation mechanisms shown, the core is to expand a bandwidth within which the counteroscillator and cantilever are effective, by a suitable interaction of the individual components of the inner part of the transducer. In particular, from the US-B 63 97 685 a transducer of the aforementioned type is known in which provided as a mass compensatory measure for the excitation oscillation, a first balancing mass and connected in the plane perpendicular to the longitudinal axis of the center plane designed as a compensating cylinder Gegenschwingers with this and as a mass compensatory measure for the Coriolis oscillation a second balancing mass and a third balancing mass are provided and the second balancing weight and the third balancing weight are formed as end regions of the counteroscillator. In this way, it is to be achieved that the existing of the measuring tube and the compensation cylinder oscillatory inner part for both the excitation vibrations of the measuring tube and for the Coriolis oscillations of the measuring tube in mass is at least largely balanced. From the WO-A 00 14 485 is also a transducer of the vibration type for a medium flowing in a pipeline, in which an inlet-side first arm which is coupled to the measuring tube in the region of a third coupling zone lying between the first and second coupling zones and which has a center of gravity in the region of the measuring tube, and an outlet-side second arm , which is in the region of a lying between the first and second coupling zone fourth coupling zone coupled to the measuring tube, and having a lying in the region of the measuring tube center of gravity, are provided. Each of the two cantilevers is intended to carry out equalizing vibrations which are designed so that the transverse impulses are compensated and thus a center of mass of an inner part formed from measuring tube, excitation arrangement, sensor arrangement and the two cantilevers is held stationary. Furthermore, in the WO-A 99 40 394 a transducer of the aforementioned type described in which the generation of the lateral forces on the inlet side counteracting opposing forces serving the first arm and the generation of the lateral forces on the outlet side counteracting opposing forces serving second arm are provided. In this case, the first arm both in the region of the first coupling zone on the measuring tube and the inlet side on the converter housing and the second arm both in the region of the second coupling zone on the measuring tube and the outlet side fixed to the converter housing, so that the counter-forces are formed so that the measuring tube despite the generated transverse forces is held in an assigned static rest position. Finally, in the US-B 66 91 583 and the US-B 68 40 109 each transducer shown, in each of which in the first coupling zone substantially rigidly fixed to the measuring tube, counteroscillator and inlet tube piece first boom and in the region of the second coupling zone substantially rigidly fixed to measuring tube, counteroscillator and Auslaßrohrstück second boom are provided. The two, esp. Arranged symmetrically to the center of the measuring tube, serve here to dynamically generate bending moments in the inlet or outlet pipe piece when the vibrating measuring tube moved laterally together with the counteroscillator and thus the two coupling zones from their respective assigned static rest position are formed, wherein the bending moments are formed so that pulses are generated in the deforming inlet pipe piece and in the deforming Auslaßrohrstück, which are opposite to the transverse pulses generated in the vibrating measuring tube. The two arms are designed and arranged in the transducer so that a lying in the region of the inlet pipe section center of gravity of the first arm and a lying in the Auslaßrohrstücks center of gravity of the second arm, despite the measuring tube is laterally displaced from its assigned static rest position, substantially remains stationary in a static rest position. The basic principle of this compensation mechanism is rather to interfere with the measurement and / or the connected pipe lateral displacement movements of the vibrating measuring tube, which are superimposed on the primary, the measurement effects causing deformations in the transducer dynamically balancing, opposing deformations of the inlet and outlet pipe section and eliminate as much as possible. By a suitable vote of the inner part, the deformations of inlet and outlet pipe piece can be formed so that the transverse pulses compensate each other largely independent of current vibration amplitudes and / or frequencies of the measuring tube. In a corresponding manner, thus also the transverse forces generated by the vibrating measuring tube can be substantially compensated by means of transverse forces generated by the deforming inlet tube piece and by the deforming outlet tube piece.

investigations on transducers However, the type described have revealed that anyway the inner part in the above sense, even with fluctuating density almost perfectly mechanically balanced, still causing significant interference in the vibration measurement signals may occur. In particular, first shown that this disorders not only equal to the vibrations of the measuring tube but that yourself these errors unfortunately also directly in the for the mass flow measurement precipitate essential phase difference and thus not to one insignificant adulteration of the measurement result to lead can. moreover can these disorders rather not reproducible and so far not readily available foreseeable manner. This is accompanied by a subsequent, For example, algorithmic compensation of these disturbances measuring signals almost impossible. More Investigations have also shown that the disorders of the aforementioned type at least indirectly from the above leads caused.

Furthermore, it has been shown that, especially in the sections of the connecting lines, which are laid practically free-running between the inner part and the converter housing, with oscillating inner part due to relative movements of the individual leads with each other, capacitive and inductive conduction and / or stray impedances changed over time and As a result, interference voltages or currents are induced directly in the leads. In addition, it has been recognized that in conventional laying of the leads - for example, along a portion of the antiphase further on a formed between two guying points for the respective connection line "open air" towards the Transducer housing - alone due to the damping effect of the relatively thin, moving wires and insulation of each of the two sensor signals an additional phase shift is impressed, in a phase difference changing manner; this in particular despite effective suppression of lateral displacements of the inner part formed by means of measuring tube and counteroscillator relative to the converter housing as a result of fluctuating density. In other words, the zero point of the measuring transducer is influenced by the connecting line to such an extent that even if the measuring tube does not flow through the medium, the measuring transducer would erroneously detect a mass flow which is different from zero. To make matters worse, that caused by the leads zero offsets are quite considerably dependent on the operating temperature and / or duration of the transducer.

in the Related to the interference caused by the connection lines in particular the aforementioned "open air route" as a disruptive cause and insofar for the measuring accuracy highlighted, this surprising meadow even for such Parts with a comparatively massive and heavy counter-oscillator. Namely in the aforementioned area Inner part and converter housing over the Connecting lines, Although rather weak, but for the aforementioned zero point instability to a considerable extent with each other mechanically coupled. Due to the relative movement of the two, the free-running line sections each intercepting guying points swinging inner part unfold the inevitably deformed thereby and / or moving line sections unfortunately their damping effect in the way that the phase difference is changed between the two sensor signals. It could here Although it can be stated that Combining the connection lines to a harness along with a placement of one of aforementioned guy points near a node of the above mentioned Coriolis modes - so practically at the center of the antitheses - a certain reduction the disturbances can be achieved. However, unfortunately, it was also noted that the aforementioned Zero error even with a very small deviation from the Perfectly central position, especially in the order of production and / or assembly technology representable tolerances, and associated with a slight eccentricity of the effective damping force or even a minor one Asymmetry of a damping force lining in terms of of the mentioned Vibration node is again of considerable extent; this in a oscillating with considerable amplitude counter-oscillator even more.

Otherwise it is the aforementioned "open air route" because of over the total operating time seen high number of oscillating cycles of the inner part also a mechanically highly stressed part of the connection lines, through an appropriate selection of resistant materials for the Lead wires and Insulations as well as a corresponding material thickness bill is to wear. Accordingly, you can the connection lines both for reasons the electrical as well as the mechanical strength not arbitrary kept thin and thus not in the sense of zero error be made mechanically ineffective without further notice.

A The object of the invention is therefore the type of holder and laying of connecting cables for transducers to improve the vibration type so that the harmful influence of the leads on the accuracy of measurement of such transducers, esp. At their respective zero point, largely suppressed or at least significantly minimized.

To achieve the object, the invention consists in a transducer of the vibration type for a medium flowing in a pipe medium., Which transducer a at least temporarily vibrating in operation measuring tube for guiding the medium, wherein the measuring tube via an inlet side einmündendes inlet tube piece and an outlet side opening with Auslaßrohrstück the pipeline communicates, a counteroscillator which is fixed on the inlet side of the measuring tube to form a first coupling zone and which is fixed to the measuring tube on the outlet side to form a second coupling zone, a first arm which is coupled to the inlet tube section and the measuring tube in the region of the first coupling zone, and having a center of mass located in the region of the inlet pipe section, and a second arm, which is coupled to the outlet pipe section and the measuring tube in the region of the second coupling zone, and a mass located in the region of the outlet pipe section has at least a portion of the counter-oscillator supported sensor arrangement for detecting vibrations of at least the measuring tube, an at least partially supported on the counter-oscillator exciter arrangement for driving at least the measuring tube, a fixed at the inlet tube piece and the Auslaßrohrstück converter housing, and connecting lines, esp. For the exciter arrangement and / or for the sensor arrangement comprises, from which leads at least one at least selectively supported on an inner part of the transducer formed by means of measuring tube, counteroscillator and the two arms and at least selectively on the converter housing. In addition, it is provided in the transducer according to the invention, that a portion of at least one of the inner part and transducer housing salary Erten connecting line between two spaced, selbige lead punctually fixed guying points free-running runs, of which a first anchor point on the inner part of the transducer and a second clamping point on the converter housing is arranged, and that the two guying points are arranged so that a relative distance therebetween even with vibrating measuring tube remains substantially unchanged.

Of Further, the invention consists in one, for example as Coriolis mass flowmeter, density meter, viscosity meter or the like trained, in-line measuring device for measuring and / or monitoring at least one parameter, for example a mass flow a density and / or a viscosity, one in a pipeline flowing Medium, in which in-line meter a transducer the above type is used.

To a first embodiment of the invention it is provided that the between the two guying points extending portion of the at least one lead is moved essentially free-swinging.

To a second embodiment of the invention it is provided that the between the two guying points extending portion of the at least connecting line essentially, especially permanently, kept free of tensile stresses is.

To A third embodiment of the invention provides that at least the at least one held at the guying points connection line in the further course along at least a portion of the Gegenschwingers misplaced and at least selectively fixed to it.

To A fourth embodiment of the invention provides that at least the at least one held at the two guying points connecting cable in the further course along an inner wall surface of the transducer housing misplaced and at least selectively fixed to it.

To a fifth Embodiment of the invention, it is provided that the measuring tube and counter-oscillator in Operation at least temporarily and / or proportionately in a payload mode oscillate laterally, in which they are substantially coplanar bending vibrations in to execute a common imaginary vibration level. To a development of this embodiment is also provided that the at least one held at the two guying points connection line at least partially outside the common plane of vibration of measuring tube and counter-oscillator also fixed on the counter-oscillator.

To a sixth embodiment of the invention it is provided that the measuring tube in Operation at least temporarily bending vibrations about an imaginary bending vibration axis executing, which imaginary connects the two coupling zones. To a development of this embodiment of the invention is provided that too the counteroscillator during operation at least temporarily bending vibrations performs a bending vibration axis, and wherein the at least a connection lead held on the cantilever at least partially, in particular predominantly, along a bending oscillating counteroscillator substantially non-distorting neutral fiber of the antiphase at selbigem is fixed.

To a seventh embodiment of the invention it is provided that the measuring tube in the essential is straight. According to a development of this embodiment The invention are measuring tube and counteroscillers aligned with each other substantially coaxially.

To an eighth embodiment of the invention it is provided that measuring tube in is essential straight and in operation at least temporarily bending vibrations about a bending vibration axis and at least temporarily torsional vibrations one substantially parallel to the bending vibration axis, especially coincident, torsional vibration axis.

To a ninth embodiment of the invention it is provided that the measuring tube in Operation at least temporarily bending vibrations about an imaginary bending vibration axis and each of the two arms in operation at least temporarily torsional vibrations around a substantially transverse to the bending vibration axis perform imaginary axis of rotation.

According to a tenth embodiment of the invention, it is provided that the measuring tube executes at least temporarily bending vibrations about an imaginary Bieschwwingungsachse and that the coupling zones are at least temporarily laterally moved with vibrating measuring tube from a static rest position. Further, the cantilevers are designed so that each of the two cantilevers due to the lateral movement of the coupling zones torsional vibrations about an essentially transverse to the bending vibration axis, imaginary axis of rotation executes. In particular, each of the two arms has at least one rest point, which remains stationary even in laterally moved coupling zones in a stationary static rest position and / or a relative distance to a both of the inlet pipe piece and From the outlet tube piece remote area of the converter housing substantially retains. According to a development of this embodiment of the invention, it is further provided that the at least one attached to the boom connection line is at least partially supported within its at least one rest area. Alternatively or in addition thereto, provision is made for a section of the at least one connecting line supported on the cantilever to extend essentially freely between two bracing points, of which at least one first bracing point is located on the arm supporting the connecting line, in particular within its at least one rest area and / or is coincident with the at least one point of rest, arranged. A second bracing point for the at least one connecting line held on the boom can, in particular, be arranged on the converter housing, especially vis-a-vis the first bracing point.

To An eleventh embodiment of the invention is provided that the at least a connection lead held on the cantilever at least partially, in particular predominantly, adhesively is fixed on the boom.

To a twelfth Embodiment of the invention is provided that at the first boom at least a first connection line and a second lead is supported on the second cantilever.

To A thirteenth embodiment of the invention is further provided that the two connection lines at least along the respective supporting arm in the same way laid and / or at least on each bracket holding in the same way fixed and / or mutually substantially symmetrical, esp. At least in terms of an inertia main axis of the antiphase are mirror-symmetrical, laid.

To A fourteenth embodiment of the invention provides that the first Tie point is placed on one of the boom, so that the at least one held at the two guying points connection line is fixed to at least one of the two arms. After a Further development of this embodiment of the invention is also provided, that the at least one held at the two guying points connection line at least partially outside a common plane of vibration of measuring tube and counter-oscillator on Boom is fixed. It can be on the the connecting line holding bracket placed first anchor point with the at least coincide a rest point or at least within at least be arranged a rest region of the boom.

Furthermore The at least one held between the two guying points lead at least proportionately adhesive be fixed to the boom and / or the second guying point for the at least a boom supported on the boom vis-a-vis the first Clamping point on the converter housing be arranged.

To a fifteenth Embodiment of the invention is provided that all leads are held on the same boom.

To A sixteenth embodiment of the invention is provided that at least two of the connection lines are combined to form a pair of wires, and that at least a pair of wires is supported on at least one of the arms.

To a seventeenth embodiment of the invention comprises the transducer furthermore at least one temperature sensor fixed on the counteroscillator and connecting cables for this.

To An eighteenth embodiment of the invention comprises the exciter assembly at least one coil and connecting cables for it. In an advantageous manner Way is the at least one coil of the exciter assembly with the Counter-oscillator mechanical, esp. Rigid, coupled.

To A nineteenth embodiment of the invention comprises the sensor arrangement at least one coil and connecting cables for it. In an advantageous manner Way is the at least one coil of the sensor assembly with the Counter-oscillator mechanical, esp. Rigid, coupled.

To A twentieth embodiment of the invention comprises the transducer at least one on the measuring tube fixed temperature sensor and / or at least one strain sensor fixed to the measuring tube and connecting cables for this.

To a twenty-first embodiment of the invention is provided that at least the at least one held between the two guying points lead during operation at least temporarily electrical power leads.

To a twenty-second embodiment of the invention is provided that on one of the two outriggers all the connection lines held are.

To a twenty-third embodiment of the invention is provided that either at least one of the connection lines at each of the two outriggers is held or that on one of the two arms none of the leads is supported.

To a twenty-fourth embodiment of the invention is provided that this Measuring tube at least partly encased by the backswing.

To a twenty fifth Embodiment of the invention it is provided that the counteroscillator substantially tubular is.

To a twenty-sixth embodiment of the invention is provided that measuring tube, inlet tube piece and the Outlet pipe piece through each Segments of a single, one-piece Tube are formed.

To a twenty-seventh embodiment of the invention is provided that everybody the boom fixed at least partially directly on the counter-oscillator is.

To a twenty-eighth embodiment of the invention is provided that everybody the boom by means of a deferred on the counter-oscillator Sleeve formed is.

To a twenty-ninth embodiment of the invention is provided that everybody the two arms has a mass that is at least equal to the Mass of the backswing is.

To a thirtieth Embodiment of the invention it is provided that each of the two arms has a mass less than 5 times the mass of the antiphase.

To a thirty-first Embodiment of the invention it is provided that each of the two arms essentially tubular or sleeve-shaped is. According to a development of this embodiment of the invention it is further envisaged that each the boom has a maximum wall thickness, the bigger than a greatest wall thickness of the counter-oscillator is. Optionally, each of the boom also a smallest Wall thickness that is larger than a largest wall thickness of the Gegenschwingers is.

To a thirty-second Embodiment of the invention is provided that the inlet tube piece and outlet tube piece substantially are just. According to a development of this embodiment of the invention it is further provided that the inlet pipe piece and the outlet pipe piece to each other as well as to a longitudinal axis imaginarily connecting the two coupling zones of the transducer are aligned substantially aligned.

According to a thirty-third embodiment of the invention, it is provided that the first boom has a first moment of inertia about an imaginary first axis of rotation lying in the first coupling zone and a second mass moment of inertia about an imaginary second axis of rotation substantially parallel to the measuring tube longitudinal axis and the second cantilever has a first mass moment of inertia around a lying in the second coupling zone, to the first axis of rotation substantially parallel imaginary second axis of rotation and a second mass moment of inertia about an axis parallel to Meßrohrlängsachse imaginary second axis of rotation. According to a development of this embodiment of the invention, it is further provided that a ratio of the first mass moment of inertia of each arm to its respective second mass moment of inertia is less than 5, esp. Less than 2 and / or each of the first two moments of inertia at least 0.01 kg · m ² and / or that each of the two second moments of inertia is at least 0.01 kg · m ² and / or that a quotient of the first moment of inertia of each boom to its respective mass is less than 0.03 m ² , esp. In one area is between 0.001 m ² and 0.01 m ² , and / or that a ratio of the quotient of the first arm as well as a ratio of the quotient of the second arm to a cross-sectional area of the measuring tube A _{10 is} less than 10.

One The basic idea of the invention is the guy point for the connection lines, in which they are hinged mechanically effective on the inner part, in to relocate such areas of the inner part, which hardly in operation or in negligible Measurements relative moved to each other and so a very small influence on the Zero point of the transducer to have.

It has also been found that the coupling zones and / or the arms coupled to the measuring tube are particularly suitable for this purpose. The ua also because these areas of the inner part in operation, esp. Even with fluctuating density of the medium to be measured, relative to the surrounding converter housing little or even not be moved. In addition, the inner part can even advantageously be dimensioned and tuned so that at least the extension arms have rest points which, despite laterally moved coupling zones, for example as a result of variable medium density, essentially remain in a rest position assigned during installation. Further improvements in the zero-point stability of the transducer can also be achieved by laying the leads along the counteroscillator, in particular on one of its essentially undistorted neutral fibers, while being guided substantially symmetrically, in particular mirror-symmetrically with respect to at least one main axis of inertia the Gegenschwingers - for example, a substantially senk right to a longitudinal axis of the measuring tube and / or the counter-oscillator extending.

One Advantage of the invention is that by positioning the guying points for the respective connection line at laterally comparatively little moving sections of the inner part due to the comparatively low mechanical load of the same not only a significant stabilization of the zero point but Improvement of the operational stability of the transducer can be achieved.

following The invention and other advantages of an embodiment explains which is shown in the figures of the drawing. Same parts are provided in the figures with the same reference numerals. if it the clarity is, is on already mentioned Refers to reference numerals in the following figures.

1 shows an in-line measuring device insertable into a pipeline for measuring at least one parameter of a medium carried in the pipeline,

2 shows an embodiment of an in-line measuring device of 1 suitable transducer of the vibration type with a measuring tube and a counter-oscillator and end-side arms in a perspective side view,

3a , b show the transducer of 2 cut in two different side views,

4 shows the transducer of 2 in a first cross section,

5 shows the transducer of 2 in a second cross section,

6 show schematically bending lines of the measuring tube and an a to d counter-oscillator oscillating in a lateral bending mode vibration,

7a , b show in various, partially sectional views of an embodiment of an end-side cantilever of a transducer according to 2 .

8th schematically shows a section of the transducer with according to 6c ) vibrating tube, and

9 shows a comparison to the embodiment of 2 slightly modified variant of a transducer of the vibration type.

In the 1 is an insertable into a - not shown - piping, for example, designed as a Coriolis mass flowmeter, density meter, Viskositätsmeßgerät or the like, in-line measuring device, the measuring and / or monitoring of at least one parameter, such as a mass flow, a density, viscosity, etc., of a medium flowing in the pipe. For this, the in-line measuring device comprises one in a corresponding electronics housing 200 accommodated - not shown here - operating and evaluation of the in-line meter electrically connected transducers of the vibration type, which is flowed through during operation according to the medium to be measured. In the 2 to 5 Corresponding embodiments and embodiments of such vibration-type transducers are shown schematically. In addition, the principal mechanical structure and its mode of action with those of those in the US-B 66 91 583 or US-B 68 40 109 shown transducer comparable. The transducer is used in a flowing medium mechanical reaction forces, eg. B. Massedurchflußabhängige Coriolis forces, density-dependent inertial forces and / or viscosity-dependent frictional forces to produce the measurable, esp. Sensory detectable, act back on the transducer. Derived from these reaction forces can be in the manner known in the art, for. B. a mass flow m, a density ρ and / or a viscosity η of the medium are measured.

For guiding the medium comprises transducer - in the embodiment shown single, substantially straight - measuring tube 10 which vibrates during operation and is thereby repeatedly elastically deformed, oscillating around a static rest position. To minimize on the measuring tube 10 acting disturbing influences as well as for the reduction of emitted by the transducer to the connected pipe vibration energy is in the transducer further one - here substantially parallel to the measuring tube 10 running - backswing 20 intended. This one is, as well as in 3 shown to form a - practically an inlet end of the measuring tube 10 defining - first coupling zone 11 # inlet side and the formation of a - practically an outlet end of the measuring tube 10 defining - second coupling zone 12 # on the outlet side on the measuring tube 10 fixed. The counter-oscillator 20 can be tubular - or box-shaped running and for example so at the inlet end and at the outlet end to the measuring tube 10 be connected, that he, as from the synopsis of 2 and 3 seen, substantially coaxial with the measuring tube 10 is aligned and thus the measuring tube 10 from the backswing 20 is sheathed. In addition, the counter-oscillator 20 designed much heavier than the measuring tube in the present embodiment 10 ,

To flow through the medium to be measured is the measuring tube 10 via an inlet pipe section which opens into the region of the first coupling zone on the inlet side 11 and via an outlet side in the region of the second coupling zone opening, in particular to the inlet pipe section 11 substantially identical, outlet tube piece 12 according to the medium to the laxative or laxative - not shown here - connected pipe. Intake pipe section 11 and outlet pipe piece 12 are in the embodiment shown essentially executed straight and to each other, the measuring tube 10 and in alignment with an imaginary longitudinal axis L practically connecting the coupling zones. According to one embodiment of the invention corresponds to a length, L ₁₁ , of the inlet pipe section 11 and a length, L ₁₂ , of the outlet pipe section 12 each at most 0.5 times a length, L ₁₀ , of the measuring tube 10 , In order to be able to provide a most possible compact transducer, in particular, both the inlet pipe piece 11 a length, L ₁₁ , as well as the Auslaßrohrstück 12 a length, L ₁₂ , each less than 0.4 times a length, L ₁₀ , of the measuring tube 10 is.

Advantageously, measuring tube 10 , Inlet and outlet pipe pieces 11 . 12 be made in one piece, so that for their production z. B. can serve a single tubular semi-finished product. Instead of that measuring tube 10 , Inlet pipe piece 11 and outlet pipe piece 12 are each formed by segments of a single, one-piece tube, these, if necessary, but also by means of individual, subsequently assembled, z. B. welded together, semi-finished products are produced.

As in 2 and 3 schematically illustrated, the transducer according to the invention further comprises one in the region of the first coupling zone with the inlet pipe piece 11 and the measuring tube 10 coupled first boom 15 one in the region of the inlet pipe section 11 lying mass center of gravity M ₁₅ , and one in the region of the second coupling zone with the Auslaßrohrstück 12 and the measuring tube 10 coupled second boom 16 , one in the area of the outlet pipe section 12 lying mass center of gravity M ₁₆ . In other words, the two, in particular substantially identical, possibly even identical, cantilever 15 . 16 so arranged in the transducer, that the respective center of mass M ₁₅ , M ₁₆ from the measuring tube 10 , Esb. lying in the flight, is spaced. The two booms 15 . 16 So are so far eccentric on inlet and outlet pipe and accordingly eccentric to measuring tube 10 and counter-oscillators 20 supported. According to a further embodiment of the invention, the boom 15 shaped and on the measuring tube 10 mounted so that its center of mass M ₁₅ substantially in a region of half a length of the inlet pipe section 11 is and is the boom 16 shaped and on the measuring tube 10 attached, the center of gravity M ₁₆ substantially in a region half a length of the Auslaßrohrstücks 12 lies. In order to obtain a compact transducer as possible is provided according to an embodiment of the invention, each of the boom 15 . 16 such that a length, L ₁₅ and L ₁₆ , the same highest 0.9 times a length, L ₁₁ , of the inlet pipe section 11 and a length L ₁₂ , the Auslaßrohrstücks 12 and / or at most a 0.5 times a length, L ₁₀ , of the measuring tube 10 equivalent. In particular, everyone is the jib 15 . 16 further designed so that the respective length thereby also possible smaller than a 0.4 times the length, L ₁₀ , of the measuring tube 10 is.

The means of the measuring tube 10 , the antitheses 20 , the inlet pipe section 11 , the outlet pipe section 12 as well as the two outriggers 15 . 16 formed inner part of the transducer is, as from a synopsis of 1 and 3 can be seen, further in an inner part medium-tight and largely pressure-resistant enveloping converter housing 30 vibrationally supported, which at each of the coupling zones remote end of the inlet and outlet pipe piece 11 . 12 is fixed accordingly. In the event that the transducer is releasably mounted to the pipeline, the inlet pipe section is 11 and the outlet pipe piece 12 in each case a first or second flange 13 . 14 formed accordingly. The flanges 13 . 14 can at the same time as an integral part of the converter housing 30 be educated. If necessary, inlet and outlet pipe pieces 11 . 12 but also directly with the pipeline, z. B. by welding or brazing connected.

For the preparation of the individual components of the aforementioned inner part can be virtually any of the usual for such transducers materials such. As steel, titanium, tantalum, zirconium, etc., or appropriate combinations of these materials are used. For example, the use of titanium for measuring tube 10 and the inlet pipe piece 11 and the outlet pipe piece 12 shown to be particularly suitable during, for example, for reasons of cost savings, both for the counteroscillator 20 and the outriggers 15 . 16 as well as the converter housing 30 the use of steel is beneficial. In order to enable a simple and cost-effective production of the boom as well as the transducer, each of the two arms 15 . 16 for example, be substantially tubular or sleeve-shaped, so that it is practically by means of a counter-oscillator 20 deferred, esp. Metallic, sleeve can be formed, esp. Even if the counter-oscillator 20 already with the measuring tube 10 has been connected. According to a further development, each of them has the respective boom 15 . 16 forming sleeves each have at least one annular groove. As can be seen from the synopsis of 2 and 3 casually, each of the at least two annular grooves in the present embodiment is substantially coaxial, esp. Concentric, to a substantially parallel to the longitudinal axis L inertial main axis of the respective arm 15 . 16 aligned. Alternatively to the use of the aforementioned sleeves for the booms 15 . 16 But these can also be combined with the counter-oscillator 20 for example, but also be made in two pieces by means of a single tubular semi-finished in one piece or by means of two tube halves.

During operation of the transducer, the measuring tube 10 - As already mentioned several times - at least temporarily to lateral bending vibrations, esp. In the range of a natural resonant frequency, so excited that it bends in this so-called Nutzmode essentially according to a natural first mode of natural vibration. The bending oscillations are aligned substantially transversely to a, in particular coincident, bending oscillation axis which is essentially parallel to the longitudinal axis L and which comprises the two coupling zones 11 # . 12 # connects imaginary with each other. According to one embodiment of the invention, the measuring tube 10 in this case with an oscillation frequency, f _exc , excited as precisely as possible a natural resonant frequency of the so-called f1 eigenmodes of the measuring tube 10 corresponds, ie a symmetrical eigenmode in which, as in 6b ) to d) shown schematically, the vibrating, but not flowed through by the medium measuring tube 10 is bent substantially symmetrically with respect to a central axis perpendicular to the longitudinal axis and thereby substantially comprises a single antinode. Equally, the counter-oscillator also becomes 20 , as in 6b shown schematically, in the operation of the transducer also excited to bending vibrations, which are substantially coplanar, but substantially out of phase with the bending vibrations of the measuring tube 10 are formed. Thus, during operation, the measuring tube and counteroscillator oscillate laterally, at least temporarily and / or proportionally, in a useful mode in which they execute substantially coplanar bending oscillations in a common imaginary plane of oscillation.

In the event that the medium flows in the pipeline and thus the mass flow m is different from zero, by means of the above-mentioned vibrating measuring tube 10 induced Coriolis forces in the medium flowing through. These in turn act on the measuring tube 10 back and cause an additional, sensory detectable - but not shown here - deformation of the measuring tube 10 according to a natural second mode of natural vibration, which is superimposed on the excited Nutzmode substantially coplanar. The instantaneous expression of the deformation of the measuring tube 10 is here, esp. In terms of their amplitudes, also dependent on the instantaneous mass flow m. As a second mode of natural vibration, the so-called Coriolismode, can, as usual in such transducers, z. B. the natural mode of the anti-symmetric f2 eigenmodes, ie those with two antinodes and / or the natural mode of the anti-symmetric f4 eigenmodes serve with four antinodes. According to one embodiment of the invention are also measuring tube 10 and counter-oscillators 20 dimensioned so that the empty measuring tube 10 a lowest natural natural frequency, f ₁₀ , which is greater than or equal to a lowest natural natural frequency, f ₂₀ , of the antiphase 20 is. In particular, measuring tube 10 and counter-oscillators 20 in this case dimensioned so that filled with water measuring tube 10 has a lowest natural natural frequency, f _{10, H2O} , which is at least equal to a lowest natural natural frequency, f ₂₀ , of the antiphase 20 is. According to a further embodiment of the invention is also provided, measuring tube 10 and counter-oscillators 20 in terms of their vibration characteristics match each other so that a lowest natural natural frequency, f _{10, H2O} measuring tube 10 even then at least 1.1 times a lowest natural natural frequency, f ₂₀ , of the antitheses 20 corresponds when it is completely filled with water. With a measuring tube 10 of titanium with a nominal diameter DN of about 55 mm, a length, L ₁₀ , of about 570 mm and a wall thickness of about 2.5 mm, a natural resonant frequency, f _{10, air} , of the f1 eigenmode of the empty measuring tube would be about 550 Hz, while a natural resonant frequency, f _10, H 2 O, of the f1 eigenmode of the water-filled measuring tube would be about 450 Hz.

According to a further embodiment of the invention are measuring tube 10 and counter-oscillators 20 further dimensioned so that a mass, m ₂₀ , the Gegenschwingers 20 at least 5 times a mass, m ₁₀ , of the measuring tube 10 equivalent. When using a tube made of steel with an outer diameter of about 100 mm and a wall thickness of about 10 mm, taking into account the dimensioned in the manner described above measuring tube for the Gegenschwingers 20 a mass, m ₂₀ , on the order of about 10 kg.

According to a development of the invention, the measuring tube leads 10 furthermore, in particular on the basis of in the US-B 68 40 109 shown transducers, at least temporarily during operation torsional vibrations about a with the longitudinal axis L or the aforementioned bending vibration axis substantially parallel, esp. Complementing, torsional vibration axis. Torsional vibration axis, bending vibration axis as well as the longitudinal axis L can, as in such transducers quite üb Lich, be coincident. For the measuring tube described above 10 For example, a lowest natural resonant frequency would result for the torsional vibrations in the range of about 750 Hz.

For generating mechanical vibrations of the measuring tube 10 - Be it now bending vibrations and / or torsional vibrations - the transducer further includes a, esp. Electrodynamic, excitation arrangement 40 , This serves to a fed by means of the operating and evaluation electronics, electrical excitation _energy E _exc , z. B. with a regulated current and / or a regulated voltage in a on the measuring tube 10 , z. B. pulse-shaped or harmonic, acting and this convert elastically deforming exciter force F _exe in the manner described above. The excitation force F _exc can here, as in 4 shown schematically, be bidirectional or unidirectional and formed in the manner known to the expert z. B. by means of a current and / or voltage control circuit, in terms of their amplitude and, z. B. by means of a phase-locked loop, be adjusted in terms of their frequency.

As exciter arrangement can, for. B. a simple differentially on measuring tube 10 and counter-oscillators 20 acting immersion coil assembly with a mechanical, esp. Rigid, to the counteroscillator 20 coupled cylindrical exciter coil, which is traversed by a corresponding excitation current in operation, and with a at least partially immersed in the excitation coil permanent magnet armature, the outside, esp. Centrally, on the measuring tube 10 is fixed, serve. Furthermore, the exciter arrangement 40 z. B. as an electromagnet or, such as. B. in the WO-A 99 51 946 shown to be realized as a seismic pathogen. For detecting vibrations of the measuring tube 10 can z. Example, be used for such a transducer usual sensor arrangement, in the manner known to those skilled in the way by means of an inlet-side first vibration sensor 50A and by means of an outlet side second vibration sensor 50B the movements of the measuring tube 10 detected and converted into a corresponding first or second sensor signal S ₁ , S ₂ . As sensors 50A . 50B can z. B. the vibrations relative to the counteroscillator, z. As differentially measuring, electrodynamic velocity sensors or electrodynamic displacement sensors or acceleration sensors can be used. Instead of electrodynamic sensor arrangements or in addition to the same can also by means of resistive or piezoelectric strain gauges measuring or opto-electronic sensors for detecting the vibrations of the measuring tube 10 serve.

According to a further embodiment of the invention, the excitation arrangement 40 as well as in 2 to 4 shown, designed and so arranged in the transducer that they at the same time, esp. Differentially, on measuring tube 10 and counter-oscillators 20 acts. I'm in the 4 embodiment shown, the exciter assembly 40 for this purpose, at least one first excitation coil through which the excitation current or excitation sub-current flows during operation, at least temporarily 41a on, at one with the measuring tube 10 connected lever 41c is fixed and over this and one from the outside at the counter-oscillator 20 fixed anchor 41b differentially on the measuring tube 10 and the backswing 20 acts. This arrangement also has the advantage that on the one hand the counter-oscillator 20 and thus also the converter housing 100 kept small in cross-section and still the exciter coil 41a , especially during assembly, is easily accessible. In addition, there is a further advantage of this embodiment of the exciter arrangement 40 also in that any used, especially at nominal widths of over 50 mm no longer negligible heavy, bobbin 41d also on the backswing 20 can be fixed and thus virtually no effect on the resonance frequencies of the measuring tube 10 to have. However, it should be noted at this point that, if necessary, the exciter coil 41a also from the backswinger 20 and accordingly the anchor 41b from the measuring tube 10 can be held.

In a corresponding manner, the sensor arrangement 50 be designed and arranged in the transducer that through them the vibrations of the measuring tube 10 and counter-oscillators 20 be detected differentially. I'm in the 5 The embodiment shown comprises the sensor arrangement 50 one on the measuring tube 10 fixed, here outside of all inertial main axes of the sensor array 50 arranged, sensor coil 51a , The sensor coil 51a is as close to one on the backswing 20 fixed anchor 51b arranged and magnetically coupled thereto so that in the sensor coil by a rotational and / or lateral, their relative position and / or their relative distance changing relative movements between the measuring tube 10 and counter-oscillators 20 influenced, variable measuring voltage is induced. Due to such an arrangement of the sensor coil 51a can be detected at the same time both the above-mentioned torsional vibrations and the possibly excited bending vibrations at the same time. If necessary, the sensor coil 51a but also on the backswing 20 and in a corresponding manner the anchor coupled thereto 51b on the measuring tube 10 be fixed.

According to a further embodiment of the invention is further provided to build vibration exciters and vibration sensors according to the same principle of action, esp. Essentially form each other structurally. Furthermore, it is also possible Lich, coil and / or anchor of exciter and / or sensor assembly waiving a mediating lever to fix each directly to the measuring tube or the counteroscillator.

For connecting the excitation arrangement as well as the sensor arrangement to the mentioned operation and evaluation electronics of the in-line measuring device are further according to connecting lines 60 provided, which are at least partially routed within the converter housing and at least temporarily conduct electricity during operation. The leads may be at least partially as electrical, at least partially wrapped in an electrical insulation wires, esp. With a mean cross-sectional diameter of less than 2 mm (for example, in an order of 0.5 mm and 1.2), z. B. inform of twisted wires, so-called "twisted pair" cables, ribbon cables and / or coaxial cables. Alternatively or in addition to this, the connection lines can also be formed, at least in sections, by means of conductor tracks of a, in particular flexible, optionally painted circuit board. In addition, the connection lines, for example, in the case of using optical vibration sensors, may be proportionately formed as at least temporarily light guiding optical fiber cable according to the operation.

According to one embodiment of the invention is also provided, the connecting lines 60 at least partially to lay sections along the Gegenschwingers and to support it at least selectively. According to a further development of the invention, it is further provided that the connecting lines routed along the counteroscillator and secured thereto are each adhesively fixed to the counteroscillator. The connection lines can thereby be fixed in an advantageous manner by placing them in an electrically insulating layer applied to the counteroscillator 70 are embedded from adhesive, sufficiently break-resistant as well as elastic material. This layer 70 For example, it may be substantially continuous or as in 2 be interrupted sections interrupted. The embedding makes it possible on the one hand, that in a very simple way a stable, permanent fixation of the connection line 60 can be created. On the other hand, when using an electrically insulating material for the embedding layer, an electrically comparatively less solid material can be selected for the insulation of the line, or even bare wire can be used as connecting lines. As the leads fixing layer 70 Here, for example, a correspondingly applied glass or glass solder, ceramic, enamel or a plastic compound can serve. As the leads to the counter oscillator fixing plastic material come z. As metal adhesive, resins or silicone in question. For buffering any thermally induced expansion of the counter-oscillator, it may be advantageous for the connecting leads to be curved in themselves, in particular arc-shaped or meander-shaped, laid on the counteroscillator 20 to fix.

As well as from the synopsis of 2 and 3b readily apparent, the leads are in the further course to a provided in the converter housing implementation D, for example made of glass, ceramic and / or plastic, led from where they continue to the mentioned operating and evaluation of the in-line measuring device. Here is a section of each of the leads 60 runs in each case between two bracing points, of which a first bracing point a1 is placed on the inner part leading the connecting line and a second bracing point is placed on the converter housing a2. The running between the respectively associated two guying points section of the leads is laid in an advantageous manner essentially free-running, and if possible so that it is essentially, esp. Permanently, kept free of tensile stresses. Depending on the position of the two guying points, it may also be necessary to use one or the other connecting line in the further course along the inner Wandoberffläche of the converter housing 30 to relocate and at least at times to fix it.

For the case described above, that also the counteroscillator performs at least at times to a considerable extent flexural vibrations about a bending vibration axis, according to a further embodiment, further provided on the counteroscillator 20 supported connection cables 60 at least proportionally, especially predominantly, along an armature which is essentially non-distorting in bending-bending counteroscillator, to transfer the neutral oscillator of the counter-oscillator and fix it accordingly. This has, inter alia, the advantage that the affected connecting lines on the one hand comparatively little moves and thus also mechanically little burdened and on the other hand even only slightly back to the inner part mechanically. In addition, it can be advantageous, at least in connection lines with comparatively strong isolation and / or in the case of a swinging oscillator having a large amplitude, that the connection lines are substantially symmetrical, in particular mirror-symmetrical with respect to one of the main axes of inertia T1, T2, T3 of the inner part formed by measuring tube and counteroscillator at least one inertial main axis T1, T2, T3 of the counteroscillator, so as to achieve an equally symmetrical possible damping lining along the inner part or anti-symmetries in the damping lining due to damping forces in possibly at least partially moving Anschlussleitun to avoid. In this case, the axis of symmetry may be, for example, an inertia main axis T2, and / or T3 of the inner part, which is essentially perpendicular to a longitudinal axis T1 of the inner part and, to that extent, of the measuring tube and / or the counter-oscillator.

As already mentioned several times, when excitation of the Nutzmodes in the vibrating in the manner described above, single measuring tube 10 As is known, lateral forces Q i generate due to mass accelerations associated with the bending oscillations; Thus, laterally aligned transverse pulses also occur in the transducer in a corresponding manner. For example, with a vibration amplitude of about 0.03 mm, a lateral force of about 100 N would result for the above-mentioned stainless steel measuring tube. In the event that these transverse forces Q ₁ can not be compensated, this leads to the fact that at the inlet pipe section 11 and at the outlet pipe piece 12 Suspended inner part of the transducer is moved according to laterally from the assigned static rest position. Along with this, as in 6c and d schematically shown, also the coupling zones 11 # . 12 # at least temporarily moves laterally out of a static rest position with vibrating measuring tube.

Accordingly, the lateral forces would Q ₁ via inlet and outlet pipe 11 . 12 at least partially also act on the connected pipe and thus also let them vibrate. As further explained, the measuring tube 10 also by means of the backswing 20 , are practically only dynamically balanced for a single medium density value, but at best for a very narrow medium density range, cf. 6b , Rather, but the measuring tube 10 and consequently virtually the entire inner part with fluctuating medium density ρ from the rest position, in the 6a to d symbolized by the longitudinal axis L, are laterally displaced, and at low density ρ below the medium density value, as in the 6c shown schematically, in the direction of its own vibratory motion or at high density ρ above the mentioned medium density value, as in 6d shown, in the direction of the oscillatory motion of the Gegenschwingers 20 , In this respect serves the counter-oscillator 20 So rather to the transducer for exactly one predetermined, z. As a most common during operation of the transducer or critical medium density value, z. B. the density of water, as far as to balance dynamically, that the transverse forces generated in the vibrating tube Q _{1 are} fully compensated as possible and the latter then virtually does not leave its static rest position, see. 6a . 6b , To a simple as possible manageable tuning of the Gegenschwingers 20 to the mentioned medium density value and then actually excited waveform of the measuring tube 10 to enable, according to an embodiment of the invention, the counter-oscillator 20 discrete mass pieces 201 . 202 , especially detachable, attached. The mass pieces 201 . 202 can z. B. screwed onto corresponding, externally fixed to the measuring tube from the outside Stud bolts or on the measuring tube 10 be deferred short pieces of pipe. Furthermore, a corresponding mass distribution over the counteroscillator 20 z. B. also be realized by molding of longitudinal or annular grooves. A suitable for each application mass distribution can in advance in the manner known to the expert z. B. by finite element calculations and / or by means of experimental measurements are readily determined. If necessary, of course, more than the two mass pieces shown 201 . 202 be used.

For further improved dynamic balance of the transducer, esp. For media with significantly varying density ρ, are - also with a view to the in the US-B 66 91 583 or the US-B 68 40 109 shown decoupling principles for bending and / or torsional vibrations - the boom 15 at inlet pipe piece 11 , Backlash 20 and measuring tube 10 as well as the boom 16 on outlet pipe piece 12 , Backlash 20 and measuring tube 10 essentially rigidly coupled. In this case, the, in particular as close as possible to the measuring tube 10 arranged out, boom 15 . 16 both material and with positive and / or non-positive with the other component of the inner part, for example, the counter-oscillator 20 be connected. Accordingly, the boom, z. B. welded, soldered, clamped and / or pressed on. In this way, by means of the boom 15 . 16 equally eccentric, ie not in the associated center of mass M ₁₅ or M ₁₆ , acting on the respective fixing point first moments of inertia, J _15x , J _16x , created, the no main moment of inertia of the respective arm 15 . 16 are. For example, each of the boom 15 . 16 for it at least proportionately directly at the Gegenschwinger 20 be fixed. For the aforementioned case, that the boom 15 . 16 each on counter-oscillator 20 and / or the associated connecting pipe piece to be clamped, they can, for. B. also be fixed by means of appropriate screw. So is in the 7a , b from the jib 15 shown an advantageous clamping connection for boom of the type described. The boom is in this case by means of at least two mutually parallel passage bolts 15 . 15b and corresponding nuts 15c . 15d after pushing on the backswing 20 fixed, the two through bolts 15a . 15b in on opposite sides in the boom 15 arranged through holes 15e . 15f are placed. To prevent accidental re-loosening of nuts 15c . 15d These, if necessary, after assembly in addition to the respective through-bolt in a suitable manner, for. Example by means of metal adhesive, adhesive and / or, z. B. by welding and / or soldering, are firmly bonded. To get the best possible adhesion between boom 15 and counter-oscillators 20 at acceptable clamping forces in the through bolts 15a . 15b and in the backswing 20 to ensure, in the variant shown here in addition to the longitudinal axis L are substantially aligned and at least on the counteroscillator 20 and the measuring tube 20 facing front section radially continuous longitudinal slots 15g . 15h incorporated.

For lateral movements of the two coupling zones 11 # . 12 # , For example, as a result of density-dependent imbalances between measuring tube 10 and counter-oscillators 20 and / or externally coupled into the transducer disturbing vibrations are on the part of the boom 15 in the inlet pipe section 11 and on the part of the jib 16 in the outlet pipe section 12 each bending moments generated due to the eccentricity and inertia of the boom 15 . 16 are formed so that concomitant deformations of inlet and outlet pipe piece 11 . 12 the lateral movements of the coupling zones 11 # . 12 # are opposite. In other words, the jibs are 15 . 16 shaped and dimensioned so that resulting first moments of inertia J _15x , J _16x about a transverse to the longitudinal axis L, but spaced from a parallel inertial main axis of the respective boom imaginary axis of rotation D _15x , D _16x , although a rotation of the boom 15 . 16 with accelerated lateral displacement of the coupling zones 11 # . 12 # , however, allow the respectively associated center of masses M ₁₅ , M _{16 to} remain, at least laterally, essentially stationary in the static rest position given to them on account of the concrete mechanical geometric properties of the arms 15 . 16 each assigned. In that regard, each of the centers of mass M ₁₅ , M ₁₆ practically forms a fulcrum for the bending moments generating rotational movements of the boom 15 . 16 , As a result, so each of the two cantilevers performs as a result of the lateral movement of the coupling zones in operation at least temporarily torsional vibrations about a substantially transverse to the bending vibration axis, imaginary rotation or torsional vibration axis D _15x , D _16x . As a result, therefore, each of the two arms has at least one resting point or a resting area immediately surrounding this, which also in laterally moved coupling zones 11 # . 12 # essentially stationary in an associated static rest position and / or substantially maintaining at least a relative distance A to a portion of the transducer housing remote from both the inlet tube and outlet tube sections.

The moment of inertia J _15x , J _16x , the cantilever acting eccentrically on the respective fixing point in the aforementioned manner 15 . 16 thus force - due to accelerated lateral displacement movements V of the measuring tube 10 oscillating around the respective mass center of gravity M ₁₅ or M ₁₆ , which is practically stationary, an additional rotation of the respectively associated fixing point about the imaginary first perpendicular to this lateral displacement movement V and to the longitudinal axis L or to the imaginary second rotation axis D substantially parallel to the first _15x , D _16x , cf. 6c and d. This, in 8th shown enlarged again, twisting virtually the entire inlet-side first coupling zone 11 ^# , esp. Of the inlet end, in turn, at least partially causes an additional, to the displacement movement V of the measuring tube 10 opposite bending of the inlet pipe section 11 , which corresponds to a practically uniaxial, transverse force-free and thus largely shear stress-free bending; in an analogous manner, the Auslaßrohrstück 12 also bent in opposite directions to the sliding movement V.

The two booms 15 . 16 are, as well as in the 1 to 4 , shown, one-sided, ie only in the region of the coupling zones 11 # . 12 # fixed. In order to suppress any unwanted vibration modes may further, as in 8th shown schematically, but additional the stabilization of the centers of mass M ₁₅ , M _{16 of} the boom 15 respectively. 16 be provided in their respective rest position spring and / or damping elements, the, z. B. transverse to the main plane of oscillation or, as shown here, lying substantially in the main plane of oscillation in each case on the cantilever mass and the converter housing 30 are fixed.

The dimensioning of the inner part, incl. The measuring tube, the Gegenschwingers, the inlet and Auslaßrohrstücks and the boom, and thereby influenced bending of inlet and outlet pipe 11 . 12 can, for. B. by means of computer-aided simulation calculations or by means of experimental measurements to be optimized so that generated by the bending counter forces Q _2, the above-mentioned transverse forces Q ₁ in the vibrating measuring tube 10 be completely or at least largely compensated over as wide a range of variation of the medium density, in such a way that outside the converter housing 30 and thus also at the connected pipe virtually no through the vibrating measuring tube 10 , If necessary, the entire oscillating inner part caused lateral forces occur. Any deformations of the connected pipe due to the bending moments thus generated, for example, by a correspondingly high bending stiffness of the converter housing 30 be easily suppressed.

According to another embodiment of the invention it is provided that the measuring tube 10 , driven by the exciter assembly, in operation to a predominant extent and / or at least temporarily with a vibration frequency, f _exc , vibrate, which corresponds to at least 1.5 times a natural low natural frequency of a vibratable inner part of the transducer, which - as already stated - At least by means of the measuring tube 10 Himself, the antitheses 20 , the inlet pipe section 11 , the outlet pipe section 12 as well as the two outriggers 15 . 16 is formed. In other words, the natural resonant frequency of the Nutzmodes should correspond to at least 1.5 times, but preferably more than a 2 times the lowest natural natural frequency of the inner part. In the dimensions of the inner part presented here would be the lowest natural natural frequency with empty measuring tube, for example, about 250 Hz or less, while it would be in water-filled measuring tube on the order of 200 Hz or less.

Further investigations have now shown that this aforementioned requirement thereby effectively, esp. While maintaining the in the US-B 66 91 583 or the US-B 68 40 109 shown decoupling principle, realized and thus, esp. In the US-B 66 91 583 or the US-B 68 40 109 shown transducers, significant improvements in immunity to interference and extent also the accuracy of in-line measuring devices of the type described can be achieved that each of the two arms 15 . 16 is designed so that it is compared to the mass, m ₁₀ , of the measuring tube 10 significantly larger mass, m ₁₅ , m ₁₆ , and that at least on the order of the mass, m ₂₀ , the Gegenschwingers 20 , Therefore, it is further provided in the inventive transducer according to an embodiment that the counteroscillator 20 and the outriggers 15 . 16 are dimensioned so that the mass, m ₁₅ or m ₁₆ , of each of the two arms 15 . 16 at least equal to one mass, m ₂₀ , of the backswinger 20 is. According to a further embodiment of the invention, each of the two arms has 15 . 16 a mass, m ₁₅ , m ₁₆ , which is greater than 1.5 times the mass, m ₂₀ , of the counter-oscillator 20 , Depending on the nominal diameter of the measuring tube used, thus, the mass, m ₁₅ , m ₁₆ , of each of the two arms 15 . 16 readily greater than 10 times the mass, m ₁₀ , of the measuring tube 10 be. Furthermore, it could be found that good results can be achieved in terms of immunity when each of the two arms 15 . 16 a mass, m ₁₅ , m ₁₆ , which is smaller than a 5 times the mass, m ₂₀ , of the counter-oscillator 20 or, at least for measuring tubes large nominal diameters above 50 mm, the highest even only a 3 times the mass, m ₂₀ , the Gegenschwingers 20 equivalent.

According to a further embodiment of the invention, each of the boom 15 . 16 such that a respective mass, m ₁₅ , m ₁₆ , more than 5 kg, esp. More than 10 kg, is, in particular but less than 50 kg.

To provide a sufficiently large mass, m ₁₅ , m ₁₆ , each is the cantilever 15 . 16 formed according to a further embodiment of the invention so that it has at least one largest wall thickness, which is greater than a maximum wall thickness of the Gegenschwingers 20 is. Furthermore, in the illustrated embodiment, each of the cantilevers 15 . 16 but also so dimensioned that he a smallest of its wall thicknesses greater than the largest wall thickness of the Gegenschwingers 20 is, whereby not only a correspondingly high mass, m ₁₅ , m ₁₆ but also one compared to measuring tube 10 and counter-oscillators 20 correspondingly high bending stiffness for each of the booms 15 . 16 can be achieved.

worin E₁₁ das Elastizitätsmodul vom Material des Einlaßrohrstücks 11 repräsentiert und I₁₁ eine für die Schwingungen des oben bezeichneten Innenteils wirksames oder mittleres axiales Flächenträgheitsmoment des Einlaßrohrstücks 11 ist. Dieses Flächenträgheitsmoment ergibt sich in bekannter Weise gemäß der Beziehung:

According to a further embodiment of the invention, at least the measuring tube 10 and the outriggers 15 . 16 matched to each other so dimensioned that filled with water measuring tube 10 has a lowest natural natural frequency, f _{10, H2O} , for which at least:

where E _{11 is} the modulus of elasticity of the material of the inlet pipe section 11 and I _{11 represents} an effective axial axial moment of inertia of the inlet pipe section for the oscillations of the above-identified inner part 11 is. This area moment of inertia results in a known manner according to the relationship:

In this case, the expression E ₁₁ · I ₁₁ / L ³ ₁₁ practically corresponds to that through the inlet pipe section 11 certain, for the oscillations of the inner part ultimately authoritative spring constant, which is practically the same at least for a substantially symmetrical structure of the inner part of the analogously determined spring constant of Auslaßrohrstsücks 12 , In that regard, equally valid in substantially symmetrical structure

According to a further embodiment, it is provided that for the oscillation frequency, f _exc , in operation with the measuring tube 10 at least temporarily vibrates to a large extent, the following applies:

As a result, so are the input and the outlet pipe piece and the masses, m ₁₅ , m _{16 of} the boom 15 . 16 coordinated so that already by them a lowest natural natural frequency of the inner part below the expected in operation of the density of the medium to be measured vibration frequency, f _exc , of the measuring tube 10 is defined.

und durch den Ausleger 16 zumindest die Bedingung

erfüllt sind.To this, as well as a possible delay as possible twisting the boom 15 . 16 and so far to achieve a high bandwidth of the decoupling mechanism are the boom 15 respectively. 16 further shaped and on the measuring tube 10 fixes that a quotient of the aforementioned first mass moment of inertia, J _15x , J _16x , by the respective associated jib m ₁₅ or m ₁₆ as small as possible. Experimental studies have further shown that, especially when using relatively heavy and so far more sluggish arms 15 . 16 For example, each more than 10 kg, a comparatively high immunity to interference of the transducer with consistently high dynamics can be achieved if the quotient J ₁₅ / m ₁₅ , J _16x / m ₁₆ , the respective mass moment of inertia, J _15x , J _16x , each arm 15 . 16 to its respective mass, m ₁₅ , m ₁₆ , is kept smaller than 0.03 m ² , esp. In a range between 0.001 m ² and 0.01 m ² . In addition, it could be found by examining the vibration behavior of transducers of the type described different nominal diameters that good results can be achieved in terms of noise immunity and dynamics, if a ratio of the aforementioned quotient J _15x / m ₁₅ , the cantilever 15 as well as a ratio of the quotient J _16x / m ₁₆ , the second boom 16 to a cross-sectional area of the measuring tube A ₁₀ (meaning the surface area) as small as possible, esp. Less than 10, is held. In view of this, it is provided according to a further embodiment of the invention, the boom 15 . 16 in each case depending on the selected for the actual transducer nominal diameter DN of the measuring tube and dimensioned so that by the boom 15 at least the condition

and by the boom 16 at least the condition

are fulfilled.

According to a further embodiment of the invention are the boom 15 . 16 and further configured such that each of the first two moments of inertia, J _15x , J ₁₆ , is at least 0.01 kg · m ² .

For the case mentioned above, that the transducer is to be operated in a dual mode, in which the measuring tube 10 both at least temporarily performs bending vibrations and at least temporarily torsional vibrations, in addition to the respective mass moment of inertia, J _15x , J _16x , each arm 15 . 16 around the associated axis of rotation, D ₁₅ , D ₁₆ , certainly also those second moment of inertia, J _15z , J _16z , the boom 15 . 16 of interest, counteract the accelerated rotations of the same about an in each case to the longitudinal axis L substantially parallel imaginary axis of rotation, D _15z , D _16z . For the transducer shown in the embodiment, in which the arms are aligned with both inlet and outlet pipe piece as well as with measuring tube and counter-oscillator, correspond to the mass moment of inertia, J _15z , J _16z , substantially one of the three main moments of inertia of the respective arm 15 . 16 and the axis of rotation, D _15z , D _16z , essentially the respectively associated inertia major axes. According to another embodiment of the invention are the boom 15 . 16 Therefore, dimensioned such that a ratio, J _15x / J _15z , J _16x / J _15z , the respective first mass moment of inertia, J _15x , J ₁₆ , each arm 15 . 16 to its respective second moment of inertia, J _15z , J _16z , less than 5, esp. _Less than 2.

_Thus , at least for the above-described case, that each of the first two moments of inertia, J _15x , J _16x , is at least 0.01 _kg.cm ² , each of the two second _{moments of} inertia, J _15z , J _16z , should be at least about 0.01 kg · m ² .

The outriggers 15 . 16 are according to a further embodiment of the invention further configured so that they have a lowest bending stiffness about the respective axis of rotation D _15x , D _16x , which is greater than a comparable bending stiffness E ₁₁ · I ₁₁ inlet pipe section 11 and a corresponding flexural rigidity E ₁₂ · I _{12 of} the outlet pipe section 12 with respect to the same axis of rotation D _15x or D _16x . For the above-mentioned case, that also the corresponding length L ₁₅ , L _{16 of} the respective cantilever 15 . 16 is chosen to be much smaller than the corresponding length, L ₁₁ , of the inlet pipe section 11 and the corresponding length, L ₁₂ , of the outlet pipe section 12 , It can also be readily ensured that the corresponding spring constant of each of the boom 15 . 16 is always greater than the above-mentioned, to E ₁₁ · I ₁₁ / L ³ ₁₁ proportional spring constant of the inlet pipe section 11 and the corresponding spring constant (~ E12 · I ₁₂ / L ³ ₁₂ ) of the outlet pipe section 12 ,

For optimal adaptation of the required Masses, moments of inertia and / or bending stiffness of the boom 15 . 16 to the, in particular by measuring tube 10 and / or counter-oscillator 20 , actually given values can, in addition or alternatively to the above-mentioned annular groove, also also, as in the 7a and 7b based on the jib 15 indicated, with the longitudinal axis L substantially aligned longitudinal grooves 15i . 15j be provided in the respective boom. In this case, the transducer according to the invention, as can be easily seen from the preceding explanations, characterized by a variety of settings that allow the expert, esp. Even after a specification of external or internal installation dimensions, a compensation of the measuring tube 10 and possibly in the counter-oscillator 20 operationally generated shear forces to achieve a high quality. The aforementioned parameters, in particular the masses, m ₁₅ , m ₁₆ , the first and second moment of inertia J _15x , J _16x , J _15x , J _16x , as well as the ratios derived therefrom can readily within wide limits to the by the for the measuring tube 10 actually provided nominal diameter DN as well as the measures provided for the transducer installation length be adjusted accordingly.

To further improve the vibration characteristics of the transducer and, consequently, to further improve the accuracy of measurement is further provided according to a further embodiment of the invention that at least one lead 601 the current during operation at least temporarily leading, possibly also fixed to the counter-oscillator in a suitable manner connecting leads 60 as well as in 2 shown schematically on at least one of the two arms 15 . 16 is held. This may, for example, be a connecting line from a line pair provided for the excitation arrangement, and / or a connecting line from a line pair provided for the sensor arrangement. Further, it is also possible to support both leads of such a pair of wires on one and the same arm. But it may also be advantageous - both in terms of any induction of interference voltages in operationally live leads and in view of any mechanical damping effects of the leads to the inner part - as in 9 shown, a first connection line 601 such a pair of cables on the first boom 15 and a second connection line 602 same pair of cables on the second boom 16 to hold accordingly.

The fixation of the leads 601 . 602 For example, again at least proportionally, in particular predominantly, adhesively on the respective cantilever. As mentioned earlier, the leads can 60 at least partially be paired together, for example, as a "twisted pair" - or as a coaxial cable. Therefore, according to a further embodiment of the invention, at least two of the connecting lines are combined to form a line pair, and that is at least one line pair on the innermost part, esp. At least one of the boom 15 . 16 , held accordingly. This can for example be done so that some of the leads are at least partially fixed directly to the boom, while in turn further leads are supported, for example, by means of cable ties. Nevertheless, however, each of the possible Erten on the cantilevered connecting lines are each adhesively secured at least in sections on the boom.

The leads are guided in accordance with a further embodiment of the invention in the manner in the inner part that laid along the counter-oscillator and optionally at least selectively fixed thereto line sections 610 '' with laid along the boom and there also fixed line sections 601 '' essentially aligned. For the case described above, that measuring tube 10 and counter-oscillators 20 according to a further embodiment of the invention, it is further provided that the at least one connecting line held on the cantilever is at least temporarily executed coplanar bending oscillations in a common-here of the inertial main axes T1, T2 imaginary spanned vibration level 601 Fixed at least partially outside the common plane of vibration of the measuring tube and counter-oscillator on the boom, esp. Along a aligned with the above-mentioned neutral fiber of the bending oscillating counteroscillator line.

According to a further embodiment of the invention, it is further provided that the first guy point a1 is arranged on the boom supporting the connection line and the second guy point a2 is arranged vis-a-vis on the converter housing. It is further provided that the extending between the two guying points a1, a2 section 601 ' the at least one cantilevered on the boom connecting line is kept substantially free of tensile stresses; this in particular permanently also in accordance with the operation oscillating inner part and any temperature fluctuations. If necessary, in the further course, the connecting cable laid in this way may also in each case also extend along an inner wall surface of the converter housing 30 misplaced and at least selectively fixed to it.

At the in 2 In the variant shown, the measuring transducer according to the invention is further designed in such a way that all of the connecting lines, which at least temporarily carry current during operation, are supported at least in sections on the same arm. This has the advantage, inter alia, that the connection successively merged into a common trunk group and led in the course with relatively little effort and optionally also can be fixed additionally. Alternatively or in addition thereto, the transducer according to the invention can also be designed such that none of the power leads carrying at least temporary electrical current are held on one of the two arms. This in particular even if, as well as in 2 represented, on the other of the two arms all of the operating at least temporarily electrical current leading leads are supported. Alternatively, it is also possible to fix the connection lines proportionally to the first arm and proportionally to the second arm accordingly, so that at least one of the connecting lines is supported on each of the two arms. Therefore, according to another - in 9 shown schematically - variant of the invention provided on the first arm 15 at least a first connection line 601 and on the second boom 16 at least a second connection line 602 to hold. According to one embodiment of this variant of the invention, it is further provided that the two connecting lines 601 . 602 at least along the respective holding cantilever laid in the same way and / or at least on the respective holding arms are fixed in the same way. In a further embodiment of the invention is further provided that these two leads 601 . 602 are moved substantially symmetrically to each other.

As already mentioned, at least one essentially free-running section of each connecting line runs between two bracing points a1, a2, of which the first (a1) on the inner part carrying the connecting line and the second (a2) correspondingly on the converter housing 30 is placed. According to an embodiment of the invention, the two guying points a1, a2 are arranged so that a relative distance A 'therebetween also in the above sense bend-bending measuring tube to reduce on the part of the leads in the inner part in the operation of any coupled damping forces 10 remains essentially unchanged or at most only slightly changed. This can be, for example, in the area of the coupling zones 11 # and 12 # , esp. But on the boom 15 . 16 to be given to a sufficient degree.

in the Considering that the in the manner described above by means of the measuring tube, the Gegenschwingers, the inner part formed of the two arms and the inlet and the outlet pipe section can be dimensioned that in Operation of each of the two outriggers has at least one rest point, which also at least laterally associated associated coupling zone laterally remains substantially stationary in an associated static rest position, such resting points or these immediately surrounding resting area are suitable of the boom for fixing leads in as position for the first guy point. On the one hand can be achieved so that the respective Connection cable to no or very little mechanical stress due to vibration of the inner part is exposed and the other at least in this area no significant on the inner part retroactive Damping forces generated. To reduce possibly from the connection lines caused on the vibrating inner part, esp mentioned Coriolis modes asymmetric, retroactive Damping forces is therefore according to a Further development of the invention provided, the at least one on the boom supported connection cable at least partially to its at least one point of rest or at least within an at least rest area immediately surrounding it is held. It is particularly advantageous here, the first guy point so to place on the boom that he with the at least one rest point substantially coincident. To minimize the length the free-running portion of the so-supported connection line is according to one Further development of the invention, the second guy point for this lead Vis-a-vis of the first guy point arranged on the converter housing.

As already mentioned, the transducer can be provided in addition to the intended for the detection of vibrations of the measuring tube vibration sensors, such as in the EP-A 831 306 , of the US-B 70 40 179 , of the US-A 57 36 653 , of the US-A 53 81 697 or the WO-A 01/02 816 proposed, even more, esp. The detection of rather secondary measures such. As temperature, acceleration, strain, voltage, etc., serving on the inner part arranged sensors 80 exhibit. The accordingly provided connecting lines can then be performed in the same way as, the connecting lines for the sensor and / or the exciter arrangement, optionally combined with these to form a trunk group. Accordingly, it is further provided in a further embodiment of the invention that the transducer least one fixed to the counteroscillator temperature sensor and / or at least one fixed to the counteroscillator strain sensor and leads 603 for it. In particular, it is further provided that of the leads for the temperature sensor and / or the strain sensor at least one, esp. All, is at least partially supported on at least one of the two arms; esp. In the same way as the leads for the exciter and / or the sensor assembly.

The transducer according to the invention is characterized by a considerably reduced Asymmetry in the occurring along the oscillating inner part Dämpfungskraftbelag and is both for measuring tubes with rather smaller nominal sizes DN, esp. In the range of less than 10 mm, and in particular for use in piping with a caliber of more than 50 mm and concomitantly also suitable for measuring tubes with nominal widths of substantially greater than 40 mm. Incidentally, it is no longer difficult for a person skilled in the art to suitably modify the exemplary variants shown with respect to the guidance and / or fixation of the leads in the manufacture of such transducers according to the actual circumstances by a somewhat different routing within the meaning of the teaching of the invention ,

Claims (53)

Vibration-type transducer for a medium flowing in a pipeline, which transducer comprises: - a measuring tube which vibrates at least temporarily during operation ( 10 ) for guiding the medium, wherein the measuring tube ( 10 ) via an inlet pipe branching in on the inlet side ( 11 ) and via an outlet-side outlet pipe piece ( 12 ) communicates with the pipeline, - a counter-oscillator ( 20 ) forming a first coupling zone ( 11 #) is fixed on the inlet side of the measuring tube and the formation of a second coupling zone ( 12 #) on the outlet side of the measuring tube ( 10 ), - one with the measuring tube ( 10 ) coupled on the inlet side first boom ( 15 ), - one with the measuring tube ( 10 ) coupled on the outlet side second boom ( 16 ), - at least partially on the counter-oscillator ( 20 ) supported sensor arrangement ( 50 ) for detecting vibrations of at least the measuring tube ( 10 ), - at least partially on the counter-oscillator ( 20 ) held pathogen arrangement ( 40 ) for driving at least the measuring tube ( 10 ), - one at the inlet pipe piece ( 11 ) and at the outlet pipe piece ( 12 ) fixed converter housing ( 30 ), and - connecting lines, esp. For the excitation arrangement and / or for the sensor arrangement, of which leads at least one at least selectively supported on a by means of measuring tube, counteroscillator and the two arms formed inner part of the transducer and at least selectively on the transducer housing, - wherein a Section of at least one of the inner part and converter housing content Erten connection line between two spaced, selbige lead point fixed fixing points free-running, of which a first anchor point on the inner part of the transducer and a second clamping point is arranged on the converter housing, and - arranged with the two guying points are that a relative distance therebetween remains substantially unchanged even with a vibrating measuring tube. transducer according to the preceding claim, wherein the running between the two guying points Section of the at least one connecting line substantially free-running is relocated. transducer according to one of the preceding claims, the section extending between the two guying points the least connecting line essentially, especially permanently, kept free of tensile stresses is. Transducer according to one of the preceding claims, wherein at least the at least one held on the guying points connection line in the further course along at least a portion of the Gegenschwingers ( 20 ) and at least selectively fixed to it. transducer according to one of the preceding claims, wherein at least the at least one held at the two guying points lead in the further course along an inner wall surface of the transducer housing misplaced and at least selectively fixed to it. transducer according to one of the preceding claims, the measuring tube and counter-oscillators in operation at least temporarily and / or proportionally in a Nutzmode laterally oscillate, in which they are substantially coplanar bending vibrations in a common imaginary plane of vibration To run. transducer according to claim 6 or 7, wherein the at least one held at the two guy points lead at least partially outside the common plane of vibration of measuring tube and counter-oscillator on Counter-oscillator is fixed. Transducer according to one of the preceding claims, wherein the measuring tube executes during operation at least temporarily bending vibrations about an imaginary bending oscillation axis, the two coupling zones ( 11 # . 12 # ) connects imaginary with each other. Transducer according to the preceding claim, wherein the counteroscillator during operation at least at times performs bending oscillations about a bending oscillation axis, and wherein the at least one held between the two bracing points lead at least partially, esp. Mostly, along a in biegeschwingendem Gegenschwinger substantially non-distorting neutral fiber of the Gegenschwingers is fixed to selbigem. A transducer according to claim 8 or 9, wherein the measuring tube ( 10 ) is substantially straight. A transducer according to the preceding claim, wherein measuring tube ( 10 ) and counter-oscillators ( 20 ) are aligned substantially coaxially with each other. transducer according to claim 10 or 11, wherein the measuring tube during operation at least Torsional vibrations at times around one with the bending vibration axis essentially parallel, in particular coincident, torsional vibration axis performs. A transducer according to the preceding claim, wherein the first cantilever ( 15 ) one in the region of the inlet pipe section ( 11 ), and wherein the second cantilever ( ₁₅ ) 16 ) one in the region of the Auslaßrohrstücks ( 12 ), M ₁₆ . A transducer according to any one of claims 8 to 12, wherein each of the two cantilevers, during operation at least at times, performs torsional vibrations about an imaginary axis of rotation (D _15x , D _16x ) substantially transverse to the bending oscillation axis. A transducer according to any one of claims 8 to 13, wherein the coupling zones ( 11 # . 12 # ) are moved at least temporarily laterally from a static rest position with vibrating measuring tube. A transducer according to the preceding claim, wherein each of the two cantilevers, due to the lateral movement of the coupling zones, performs torsional vibrations about an imaginary axis of rotation (D _15x , D _16x ) substantially transverse to the bending vibration axis. transducer according to claim 15 or 16, wherein each of the two arms at least has a rest point or a rest area surrounding it, which is also substantially stationary in the case of laterally moved coupling zones in an associated static rest position persists and / or a relative distance (A, A ') to one both from the inlet pipe section as well removed from the outlet pipe section Area of the converter housing essentially retains. transducer according to the previous claim, wherein the first guy point on a the boom is placed so that the at least one of the two Clamping points held connection lead to at least one the two outriggers is fixed. transducer according to the previous claim, wherein the at least one of the two Clamping points held connection lead at least partially outside the common plane of vibration of measuring tube and counter-oscillator on Boom is fixed. transducer according to the previous claim, wherein the at least one of the two Clamping points held connection lead at least partially held within the at least one rest area of the boom is. transducer according to the previous claim, wherein the first guy point on the the connection line holding bracket within which at least one rest area is arranged. transducer according to the previous claim, wherein the first guy point on the boom coincident with the at least one resting point. transducer according to one of the claims 18 to 23, wherein the at least one between the two guying points supported connection cable at least partially adhesive is fixed on the boom. transducer according to one of the claims 18 to 24, wherein the second clamping point for the at least one of the boom supported connection cable Vis-a-vis of the first guy point arranged on the converter housing is. transducer according to one of the preceding claims, furthermore comprising at least one temperature sensor fixed to the counteroscillator and connecting cables for this. transducer according to one of the preceding claims, wherein the exciter assembly at least one coil and leads for it. transducer according to the preceding claim, wherein the at least one coil of Exciter arrangement with the counteroscillator mechanically, esp. Rigid, is coupled. transducer according to one of the preceding claims, wherein the sensor arrangement at least one coil and leads for it. transducer according to the preceding claim, wherein the at least one coil of Sensor arrangement with the counteroscillator mechanically, esp. Rigid, is coupled. Transducer according to one of the preceding claims, wherein at least the at least one held between the two clamping points lead in operation at least temporarily elektri electricity. transducer according to one of the preceding claims, where all leads are held on the same boom. transducer according to one of the preceding claims, wherein on one of the two arms all of the connecting lines are held. transducer according to one of the preceding claims, wherein on each of the two arms at least one of the connection lines is held. transducer according to one of the claims 1 to 32, wherein at one of the two arms none of the leads is held. Measuring transducer according to one of the preceding claims, wherein the measuring tube ( 10 ) at least partially from the counter-oscillator ( 20 ) is sheathed. Transducer according to one of the preceding claims, wherein the counteroscillator ( 20 ) is substantially tubular. Measuring transducer according to one of the preceding claims, wherein measuring tube ( 10 ), Inlet pipe piece ( 11 ) and the outlet pipe piece ( 12 ) are each formed by segments of a single, one-piece tube. Transducer according to one of the preceding claims, wherein each of the arms ( 15 . 16 ) at least proportionately directly at the counter-oscillator ( 20 ) is fixed. Transducer according to one of the preceding claims, wherein each of the arms ( 15 . 16 ) by means of a counter-oscillator ( 20 ) pushed sleeve is formed. Measuring transducer according to one of the preceding claims, wherein each of the two arms ( 15 . 16 ) has a mass, m ₁₅ , m ₁₆ , which is at least equal to the mass, m ₂₀ , of the counter-oscillator ( 20 ). Measuring transducer according to one of the preceding claims, wherein each of the two arms ( 15 . 16 ) has a mass, m ₁₅ , m ₁₆ , which is smaller than a 5 times the mass, m ₂₀ , of the counter-oscillator ( 20 ). Measuring transducer according to one of the preceding claims, wherein each of the two arms ( 15 . 16 ) is formed substantially tubular or sleeve-shaped. A transducer according to the preceding claim, wherein each of the arms has a maximum wall thickness greater than a maximum wall thickness of the counter-oscillator ( 20 ). A transducer according to the preceding claim, wherein each of the arms ( 15 . 16 ) has a smallest wall thickness which is greater than a maximum wall thickness of the counter-oscillator ( 20 ). Measuring transducer according to one of the preceding claims, wherein the inlet pipe piece ( 11 ) and outlet pipe piece ( 12 ) are substantially straight. A transducer according to the preceding claim, wherein inlet tube piece ( 11 ) and outlet pipe piece ( 12 ) to one another and to a longitudinal axis (L) of the transducer imaginarily connecting the two coupling zones are aligned substantially aligned. Transducer according to one of the preceding claims, wherein the first cantilever ( 15 ) has a first moment of inertia, J _15x , about an imaginary first axis of rotation, D _15x , located in the first coupling _zone , and a second mass moment of inertia, J _15z , about an imaginary second axis of rotation, D _15z , substantially parallel to the measuring tube axis and wherein the second cantilever ( 16 ), a first moment of inertia, J _16x , about an imaginary second axis of rotation, D _16x , substantially parallel to the first axis of rotation, D _15x , and a second mass moment of inertia, J _16z , about an imaginary second section substantially parallel to the tube axis _Fulcrum , D _16z , has. A transducer according to the preceding claim, wherein a ratio, J _15x / J _15z , J _16x / J _15z , the first mass moment of inertia, J ₁₅ , J ₁₆ , of each cantilever ( 15 . 16 ) at its respective second mass moment of inertia, J _15z , J _16z , less than 5, especially less than 2. A transducer according to claim 47 or 48, wherein each of the first two _{moments of} inertia, J _15x , J _16z , at least 0.01 kg · m ² and / or wherein each of the two second _{moments of} inertia, J _15z , J _16z , at least 0.01 kg · m ² is. A transducer according to any one of claims 47 to 49, wherein a quotient J ₁₅ / m ₁₅ , J ₁₆ / m ₁₆ , the first mass moment of inertia, J _15x , J _16x , of each cantilever ( 15 . 16 ) to whose respective mass, m ₁₅ , m ₁₆ , is less than 0.03 m ² , in particular in a range between 0.001 m ² and 0.01 m ² . A transducer according to the preceding claim, wherein a ratio of the quotient J _15x / m ₁₅ , of the first cantilever ( 15 ) as well as a ratio of the quotient J ₁₆ / m ₁₆ , of the second arm ( 16 ) to a cross-sectional area of the measuring tube A _{10 is} less than 10. A transducer according to the preceding claim, wherein the first cantilever ( 15 ) the condition

and the second boom ( 16 ) the condition

fulfill. Use of a transducer according to a the previous claims in an in-line meter for measuring and / or monitoring at least one parameter, in particular a mass flow, m, a Density, ρ, and / or a viscosity, η, one in a pipeline flowing medium in particular a Coriolis mass flowmeter, a densitometer, a Viscosity meter or the like.