CN1185525A - Injection device for injection of fuel - Google Patents
Injection device for injection of fuel Download PDFInfo
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- CN1185525A CN1185525A CN96114064A CN96114064A CN1185525A CN 1185525 A CN1185525 A CN 1185525A CN 96114064 A CN96114064 A CN 96114064A CN 96114064 A CN96114064 A CN 96114064A CN 1185525 A CN1185525 A CN 1185525A
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Abstract
A fuel injector which can gradually increase injection rate at the begining and cut-off at once in the end is characterized in that two throttle orifices are overlapped at the inlet of a hydraulic oil cylinder, the lower throttle orifice is small in hole diameter and large in chamfer, and the upper throttle orifice is large in hole diameter and small in chamfer.
Description
The present invention relates to the sparger that burner oil is used, the especially the sort of hydraulic jack that is provided with in nozzle body is pressed in nozzle needle on the valve seat and the injection of fuel shutoff by the piston of this hydraulic jack; When removing the hydraulic pressure of above-mentioned hydraulic jack, above-mentioned nozzle needle mentioned and carry out the sparger that burner oil that fuel sprays is used by fuel pressure.
The fuel-injection pump of furnace bosh type is just being proposed to replace with the fuel injection system of pressure accumulation type now as the fuel injection system of diesel engine, the fuel-injection pump of furnace bosh type is by cam plunger to be pushed to when spraying at every turn, and by camshaft and mechanical governor the revolution of motor is fed back to the control tooth bar, the fuel feed that sprays for 1 time by this control tooth bar control.
And the fuel injection system of pressure accumulation type is by compression pump fuel to be pressurizeed, and pressurized fuel pressure accumulation in addition in common rail for example, be contained in the pressure that three-way valve in the sparger is removed piston by conversion group, nozzle needle is mentioned and burner oil; Be applied to fuel pressure on the piston opportunity in regulation again, nozzle needle is pressed on the valve seat and stops to spray.
Like this, the fuel injection system of pressure accumulation type is different with common fuel injection system, and it makes nozzle needle carry out switch by fuel pressure.Fuel is divided into two paths in sparger, i.e. the path of using to the hydraulic jack fueling used of the path of burner oil and drive controlling nozzle needle.When not spraying, be added in edge on the nozzle needle with respect to path and mention the power of direction, improve the power of nozzle needle being depressed by the piston of hydraulic jack by burner oil, nozzle needle is pressed on the valve seat and forms closed condition.Relative therewith, when burner oil, will compress the fuel pressure that feeds to hydraulic jack of nozzle needle remove, by fuel pressure effect, nozzle needle with opening of valves, with regard to burner oil.
On the other hand, as the fuel injection system of diesel engine, be when beginning to spray, will increase Spraying rate lentamente to its desired characteristic.This specific character is fuel temperature to be reduced the characteristic that requires in order to reduce the nitrogen oxide quantity in engine noise and the exhaust in order to prevent the diesel engine knocking.
And, when stopping to spray, require fuel is cut off apace.That is, the spray characteristic of fuel is sharp Spraying rate to be cut to zero characteristic, can prevent to produce in the exhaust hydrocarbon or black smoke by this specific character.
But in above-mentioned accumulator fuel injection device, characteristic that fuel sprays and the characteristic that stops to spray by removing fuel pressure from the fuel oil cylinder and applying the fuel pressure decision to the fuel oil cylinder, promptly depend on fuel pressure respectively basically.Therefore this problem is arranged, promptly must obtain opposite characteristic by the fuel pressure of the common rail of uniform pressure.
The present invention makes for sort this problem out, and the sparger that provides a kind of burner oil that such fuel injection characteristic arranged to use is provided, promptly can produce retardation phenomenon especially between its fuel injection rate when beginning to spray and when stopping to spray.
In order to achieve the above object, the present invention takes following technological scheme:
The sparger that a kind of burner oil is used, it is to be provided with hydraulic jack in nozzle body, by the piston of this hydraulic jack nozzle needle is pressed on the valve seat and the injection of fuel shutoff, and when removing the hydraulic pressure of above-mentioned hydraulic jack, above-mentioned nozzle needle mentioned and carry out that fuel sprays by fuel pressure, it is characterized in that:
It is that the many pieces of restricting orifices that have an aperture are provided on the intake section of above-mentioned hydraulic jack with overlapping, and above-mentioned aperture is with respect to the edge chamfering in above-mentioned hydraulic jack, the outside or formation curved surface.
The sparger that a kind of burner oil is used, it is to be provided with hydraulic jack in nozzle body, by the piston of this hydraulic jack nozzle needle is pressed on the valve seat and the injection of fuel shutoff, and when removing the hydraulic pressure of above-mentioned hydraulic jack, by fuel pressure above-mentioned nozzle needle is mentioned Yan and carries out that fuel sprays, it is characterized in that:
It is that control panel and restricting orifice are provided on the intake section of above-mentioned hydraulic jack with overlapping, above-mentioned control panel is the inner vortex chamber that forms, above-mentioned restricting orifice is the aperture that central part is provided with the gateway that constitutes above-mentioned vortex chamber, and with respect to control panel, be configured in above-mentioned oil cylinder opposition side on.
The sparger that a kind of burner oil is used, it is to be provided with hydraulic jack in nozzle body, by the piston of this hydraulic jack nozzle needle is pressed on the valve seat and the injection of fuel shutoff, and when removing the hydraulic pressure of above-mentioned hydraulic jack, above-mentioned nozzle needle mentioned and carry out that fuel sprays by fuel pressure, it is characterized in that:
It is that central part is had the restricting orifice that aperture and periphery have longitudinal furrow, and be provided in the intake section of hydraulic jack with respect to the spring that above-mentioned restricting orifice is pushed on stepped part ground, and above-mentioned step part is the longitudinal furrow of inaccessible and hydraulic jack opposition side.
Invention is to be provided with hydraulic jack in nozzle body, by the piston of this hydraulic jack nozzle needle is pressed on the valve seat and the injection of fuel shutoff; And when removing the hydraulic pressure of above-mentioned hydraulic jack, above-mentioned nozzle needle is mentioned and carry out the sparger that burner oil that fuel sprays is used by fuel pressure, it is characterized in that: it is that the restricting orifice that majority has an aperture is provided on the intake section of above-mentioned hydraulic jack with overlapping, the outer ledge of above-mentioned aperture be the ground chamfering of above-mentioned relatively hydraulic jack or the formation curved surface.
In this structure, shape by the aperture of the most restricting orifices on the intake section that is provided in hydraulic jack with being overlapped, resistance in the time of can be the fuel pressure of removing hydraulic jack increases, and can reduce the resistance when hydraulic jack applies fuel pressure, thereby make the characteristic when beginning to spray and the characteristic when stopping to spray between have retardation phenomenon.
The present invention is provided with hydraulic jack in nozzle body, by the piston of this hydraulic jack nozzle needle is pressed on the valve seat and the injection of fuel shutoff; And when removing the hydraulic pressure of above-mentioned hydraulic jack, above-mentioned nozzle needle is mentioned and carry out the sparger that burner oil that fuel sprays is used by fuel pressure, it is characterized in that: it be control panel and restricting orifice life be provided on the intake section of above-mentioned hydraulic jack, above-mentioned control panel is the inner vortex chamber that forms, above-mentioned restricting orifice is the aperture that central part is provided with the discrepancy that constitutes above-mentioned vortex chamber, and with respect to control panel, be configured in above-mentioned oil cylinder opposition side on.
Like this, if use this structure, by control panel and the restricting orifice on the intake section that is provided in hydraulic jack with overlapping, when removing fuel pressure, hydraulic jack producing eddy current, the adverse current zone takes place in heart portion therein, thereby reduces the stream basal area effectively, and does not produce this eddy current when applying fuel pressure, thus, between characteristic from hydraulic jack releasing fuel pressure time the and the characteristic when hydraulic jack applies fuel pressure a retardation phenomenon just can be arranged.
The present invention is provided with hydraulic jack in nozzle body, by the piston of this hydraulic jack nozzle needle is pressed on the valve seat and the injection of fuel shutoff, and when removing the hydraulic pressure of above-mentioned hydraulic jack, above-mentioned nozzle needle is mentioned and carry out the sparger that burner oil that fuel sprays is used by fuel pressure, it is characterized in that: it is the intake section that has central part aperture and periphery that the restricting orifice of longitudinal furrow is arranged and be provided in hydraulic jack with respect to stepped part ground by the spring that presses restricting orifice, and above-mentioned stepped part is the longitudinal furrow of inaccessible and hydraulic jack opposition side.
Like this, removing fuel pressure from hydraulic jack is that center hole by restricting orifice carries out, therewith relatively, the fuel oil cylinder is applied aperture that fuel pressure is the central part by restricting orifice and the longitudinal furrow on the periphery carries out, thereby just may make between the applying of the releasing of fuel pressure and fuel pressure and produce speed difference.There is a hysteresis to resemble between the characteristic in the time of like this, just making the characteristic when beginning burner oil and stop burner oil.
The present invention has following positive effect:
The present invention is the intake section that many pieces of restricting orifices is configured in with overlapping hydraulic jack, and these restricting orifices have outer ledge by with respect to aperture hydraulic jack ground chamfering or the formation curved surface.
Like this, have retardation phenomenon thus between the characteristic in the time of just making the characteristic when hydraulic jack is removed hydraulic pressure and apply hydraulic pressure, when the beginning burner oil, can get spray characteristic slowly by these many pieces of restricting orifices, can fast shut-off when stopping to spray.
The present invention is the intake section that control panel and restricting orifice is configured in with overlapping hydraulic jack, and control panel wherein is inner formation vortex chamber; Restricting orifice be have the aperture of the gateway that constitutes the vortex chamber at central part, be configured in respect to control panel with the oil cylinder opposition side on.
Like this, at the hydraulic pressure of removing it from hydraulic jack, by the eddy current that occurs in the vortex chamber effective cross sectional area is diminished, can make the characteristic of characteristic when applying hydraulic pressure when removing hydraulic pressure slow, between the characteristic when making the characteristic when beginning burner oil and stopping burner oil retardation phenomenon is arranged, can provide a kind of has the fuel of only spray characteristic to spray the sparger of usefulness.
The present invention has aperture to central part, and periphery has a restricting orifice of longitudinal furrow and be provided in the intake section of hydraulic jack with respect to the spring that stepped part is pushed above-mentioned restricting orifice, and above-mentioned stepped part is the longitudinal furrow of inaccessible and hydraulic jack opposition side.
Like this, when removing the hydraulic pressure of hydraulic jack,, only carry out the releasing of hydraulic pressure, and when applying hydraulic pressure, just can apply hydraulic pressure by the center hole of restricting orifice and the longitudinal furrow of periphery by center hole by the inaccessible above-mentioned longitudinal furrow of above-mentioned stepped part.Therefore, just can form characteristic slowly, the rapid Spraying rate characteristic in the time of obtaining stopping to spray by the Spraying rate when beginning to spray.
Following with reference to accompanying drawing, embodiments of the invention are elaborated:
Fig. 1 is the integrally-built flow diagram of expression accumulator fuel injection device of the present invention.
Fig. 2 is the profile diagram of the action of expression sparger of the present invention.
Fig. 3 is the profile diagram of the concrete structure of expression sparger of the present invention.
Fig. 4 is the profile diagram of structure of the restricting orifice of expression hydraulic jack intake section of the present invention.
Fig. 5 is the profile diagram of the fuel stream major component at the expression restricting orifice place when stopping to spray of the present invention.
Fig. 6 is the chart of mentioning characteristic of expression nozzle needle of the present invention.
Fig. 7 is the chart of the variation of expression fuel injection rate of the present invention.
Fig. 8 is expression the restricting orifice on the hydraulic jack intake section and the shunting oblique drawing of control panel structure of being installed in of the present invention.
Fig. 9 is the profile diagram of Fig. 8.
Figure 10 is the profile diagram of restricting orifice of the present invention.
Figure 11 is of the present invention the profile diagram of vortex chamber's pattern ground expression.
Figure 12 is the top view of above-mentioned vortex chamber of the present invention.
Figure 13 is the top view that expression periphery of the present invention is provided with the restricting orifice of longitudinal furrow.
Figure 14 is the profile diagram of expression above-mentioned restricting orifice of the present invention.
Figure 15 is the profile diagram of the configuration of expression restricting orifice up and down of the present invention.
Figure 16 is the profile diagram of the action of expression releasing fuel pressure of the present invention.
Figure 17 is the expression profile diagram that applies the action of fuel pressure of the present invention.
Fig. 1 is the process block diagram of the whole fuel injection system structure with sparger that burner oil uses of expression the 1st mode of execution of the present invention, and this fuel injection system is provided with the pressurize compression pump 10 of usefulness of fuel.Compression pump 10 is provided with plunger 11, by the cam 12 that is installed on the camshaft this plunger 11 is pushed to, and makes the fuel of pressurized chamber 13 in upside space of plunger 11 pressurized.
Fuel in the fuel tank 15 are by precipitator 16 and filter 17 backs, attracted by charge pump 18, by 19 backs of the fuel filter on the discharge side that is arranged on charge pump 18, be fed to 13 li of the pressurized chambers of plunger 11 upsides of above-mentioned compression pump 10.Pressurized chamber 13 makes fuel revert to fuel tank 15 by one-way valve 20.
The discharge side of above-mentioned pressurized chamber 13 by one-way valve two and and the common rail 23 of formation pressure accumulating chamber be connected.One-way valve 24 is installed on the common rail 23.This one-way valve 24 constitutes pressure restrictor, opens above setting value at the pressure of common rail 23, makes fuel revert to fuel tank 15 sides.Common rail 23 also by flow limiter 25 be connected with sparger 26.Flow restrictor 25 is the members that cut off action when the fuel flow rate that flows through sparger 26 increases singularly, stop abnormal injection to be used.
For this fuel injection system being carried out whole control, the controller for electric consumption 30 that contains computer is being set.Electric control device 30 is connected with the pressure transducer 31 of pressure in detecting common rail 23.Be connected pump control valve 32 between the pressurized chamber 13 of compression pump 10 and the one-way valve 20 that leaks side, its electromagnetic coil 33 is by above-mentioned electric control device 30 controls.
Connecting respectively on the electric control device 30 throttle sensor 35 that detects the accelerator card amount of entering into, detection of engine revolution motor rotary sensor 36, be arranged on cylinder discriminating sensor 37 on the motor, be arranged on the cylinder discriminating sensor 38 on the pump.
Below, the structure of the sparger 26 that is being connected with Flow restrictor 25 by common rail 23 is described, as Fig. 1, Fig. 2 and shown in Figure 3, nozzle body 40 is installed in the forward end of this sparger 26.Nozzle body 40 is held in nozzle needle 41 slidable, and the fore-end of this nozzle needle 41 is pressed on the valve seat 42, thus, the fuel that sprays from spout 43 is controlled.Main oil well 44 also is being set in nozzle body 40, just fuel pressure often can be added to this main oil well 44 by fuel passage 45.
Below, illustrating in greater detail restricting orifice 52,53, the intake section of the hydraulic jack 51 that piston 50 is held in can be slidably, be provided with in nozzle body is as illustrated in fig. 4 setting 2 pieces of restricting orifices 52,53 especially overlappingly.These restricting orifices 52,53 have aperture 56,57 respectively at their central part.
Wherein, the aperture 56 of the restricting orifice 52 of upside has the aperture bigger than the aperture 57 of the restricting orifice 53 of downside.And the intake section of these apertures 56,57 all has and constitutes plane of inclination 58.In these plane of inclination, the restricting orifice 52 of the ratio upside of the restricting orifice 53 of downside big.By being overlapped in this wise, the restricting orifice 52,53 that has aperture 56,57 respectively sets, and form the chamfering that has the plane of inclination respectively at their intake section, just the equivalent circuit with one-way valve 54 shown in Figure 1 and throttle orifice 55 is identical on function, the characteristic that characteristic when making the fuel injection beginning and fuel spray when stopping to have difference, makes the fuel injection rate characteristic have retardation phenomenon.
Three-way valve 59 is as shown in Figure 1-Figure 3 being assembled on top in sparger 26 inside.By compression helical spring 60 three-way valve 59 is pressed to the below, with its bullet upward by solenoid 61.And, when solenoid 61 does not have excitation, shown in Fig. 2 A, fuel passage 62 is connected with the aperture 63 of three-way valve 59.The opening 64 of link to each other the earthing with this aperture 63, below the bottom of three-way valve 59 forms, opening.
When solenoid 61 did not have excitation, three-way valve 59 also cut off fuel passage 62 and fuel passage 65.Fuel passage 65 is connected with the aperture 66 that effusion fuel is used.
Below, the action of the fuel injection that is formed by system shown in Figure 1 is described.Part output, driving charge pump 18 and compression pump 10 by motor.Charge pump 18 arrives fuel filling in the pressurized chamber 13 of compression pump 10 by fuel filter 19 by the fuel that precipitator 16 and filter 17 attract in the fuel tank 15.
The plunger of being pushed to by cam 12 11 is the fuel pressurization of pressurized chamber 13, and by being supplied to common rail 23 behind the one-way valve 22, carried out the pressure accumulation of fuel by this common rail 23.Wherein, when compression pump 10 is pressurizeed by cam 12, pump control valve 32 is controlled by electromagnetic coil 33 switches, the computer of electric control device 30 according to the deviation of the pressure of goal pressure and common rail 23, suitably computing makes the time that pump control valve 32 is cutting out, and it often is controlled to goal pressure.
If illustrate in greater detail this action, promptly be to control pump control valve set on the compression pump 10 32 by electromagnetic coil 33, when pump control valve 32 is closed, plunger 11 is pushed to, fuel is just pressurized, and when pump control valve 32 is unlocked, under the occasion that plunger 11 is brought to, fuel revert to fuel tank 15 by pump control valve 32 and one-way valve 20, by pump control valve 32 effusion pressure.Compression pump 10 changes discharge capacity by making pump control valve 32 ON-OFF, the desired value ground feedback control on the computer of formation pressurization electric control device 30, the signal of the pressure transducer 31 of common rail 23.
A little a bit just can not correctly carry out unusually by the common rail 23 interior pressure feedback controls that above-mentioned electric control device 30 forms, when the pressure in public oil pipe 23 surpasses the setting pressure of one-way valve 20, the one-way valve 24 that constitutes pressure restrictor is unlocked, and fuel pressure just escapes into fuel tank 15 sides.
Like this, accumulate certain pressure for 23 li at common rail, this pressure is added on the sparger 26 by Flow restrictor 25.
Fuel pressure in the above-mentioned common rail 23 acts on the nozzle needle 41 by fuel passage 45 and main oil well 44 simultaneously.
At this moment, the power of effect is that the piston 50 of hydraulic jack 51 is accepted the power downwards that caused by fuel pressure and the pushing spring 49 power sum below push rod 48 is pressed to downwards.Therewith relatively, power upward is that nozzle needle 41 is accepted the main oil well upwards power of effect 44 that part of, that caused by fuel pressure.
Because the diameter of the piston 50 of hydraulic jack 51 wherein is more much bigger than the diameter of the slipper seal portion of nozzle needle 41, and the power downwards of pushing spring 49 effects is much bigger, thereby the fore-end of nozzle needle 41 just is pressed on the valve seat 42, in these valve seat 42 parts, nozzle needle 41 is with fuel cut-off, and formation there is not spray regime.
Electric control device 30 detects the accelerator pedal amounts of entering into by throttle sensor 35, and by the revolution of rotary sensor 36 detection of engine.Also as required, according to the only discharge time of other information computing and injection opportunity.Then, make solenoid 61 excitations on the opportunity of regulation.
Immediately, three-way valve 59 is moved upward, makes it to hold shown in Fig. 2 B by solenoid 61 effects and rises to the top.Like this, owing to three-way valve 59 is lifted off a seat, thereby the upside space segment of hydraulic jack 51 is connected with aperture 66 by fuel passage 65.Therefore, pushing the aperture 56,57 of the restricting orifice 52,53 of fuel pressure by hydraulic jack 51 of the piston 50 of hydraulic jack 51, fuel passage 65, aperture 66 and leak.Just the piston 50 with hydraulic jack 51 that is formed by fuel pressure is pressed to the power releasing of below thus.
Like this,, nozzle needle 41 is pressed to making every effort to overcome of top obey the pushing force that pushes spring 49, will spray 41 and mention upward, the fore-end of this nozzle needle 41 is left from valve seat 42 by the fuel pressure that is applied on the main oil well 44.Like this, just carry out the injection of fuel by spout 43.
Because when releasing acts on the fuel pressure on piston 50 tops of above-mentioned hydraulic jack 51, be configured in aperture 56,57 one-tenth throttles of a pair of restricting orifice 52,53 on the intake section of hydraulic jack 51, thereby the releasing of fuel pressure is carried out lentamente.Like this, nozzle needle 41 can be slowed down with respect to the rate of climb of valve seat 42.
After this, shown in Fig. 2 A, when removing the excitation of solenoid 61, by compression helical spring 60 effects three-way valve 59 is moved downwards for another example, the front end of three-way valve 59 cuts off fuel passage 62,65.Fuel pressure is by fuel passage 62, aperture 63, acts on above the piston 50 of hydraulic jack 51 through the aperture 56,57 of Rectifier plate 52,53, nozzle needle 41 pressed to powerfully the below shown in Fig. 2 A.
Like this, because as shown in Figure 4 and Figure 5, the sparger 26 that carries out the fuel injection forms this structure at the intake section of hydraulic jack 51, the i.e. structure that the different mutually 2 kinds of restricting orifices 52,53 of the chamfering of the pore size of aperture 56,57 and plane of inclination 58 size are overlapped, thus the difference in flow that forms on the fuel flow direction guarantee to become maximum, until 1.5.
Promptly, the restricting orifice that varies in size 52 of the pore size of aperture 56,57 and inclination area 58,53 one-tenth 2 grades ground are overlapped, the coincident configurations of restricting orifice 52,53 is made hydraulic jack 51 sides dispose the aperture 57 with smaller aperture due, restricting orifice 53, dispose the aperture 56 with larger aperture, the restricting orifice 52 that the plane of inclination 58 of less chamfering is arranged in the above with plane of inclination 58 of big chamfer dimesion.
When injection beginning, fuel is overflowed from hydraulic jack 51.At this moment fuel flows as shown in Figure 4.Promptly partly produce in the lower edge of the aperture 57 of the restricting orifice 53 of downside and peel off, this part forms pressure loss.After this, when entering this aperture 56, produce again in the lower edge of this aperture 56 part and to peel off, to produce pressure loss for aperture 56 by restricting orifice 52.Like this, produce at 2 positions under the state of pressure loss, fuel pressure just is disengaged.
Therewith relatively, in hydraulic jack 51, applying fuel pressure, pushing with piston 50 under the occasion of nozzle needle 41, fuel flows as illustrated in fig. 5.At this moment, at the intake section of the aperture 56 of restricting orifice 52,, fuel is flowed smoothly by plane of inclination 58 effects.And when passing through the aperture 57 of restricting orifice 53,, fuel is flowed also smoothly by 58 effects of chamfering plane of inclination.Therefore, when in hydraulic jack 51, applying fuel pressure, can not produce and peel off.
Like this, because the time from hydraulic jack 51 releasing fuel pressures, its edge section at the inlet side of the aperture 56,57 of restricting orifice 52,53 is produced peels off, and, when in this hydraulic jack 51, applying fuel pressure, the plane of inclination 58 that constitutes by chamfering by the intake section of the aperture 56,57 of throttling also plate 52,53, it is not produced peels off, thereby can form as shown in Figure 1 single generation 54 and the structure of the shunt circuit equivalence of throttle orifice 55, this has retardation phenomenon the characteristic when characteristic in the time of making the injection beginning of fuel and injection stop.
That is, the mentioning of the nozzle needle of being pushed by the piston 50 of this hydraulic jack 51 41 forms shown in Figure 6, the nozzle needle 41 during with respect to injection beginning to mention the decline of spraying the nozzle needle 41 when stopping lentamente then be characteristic jumpy.Among Fig. 6, ordinate is represented the h that mentions of nozzle needle, horizontal ordinate express time (crank angle) t.Therefore, fuel injection rate also with regard to as illustrated in fig. 7, to increase gradually when injection beginning when injection stops then be sharply to stop.Among Fig. 7, ordinate is represented the Spraying rate a of fuel, horizontal ordinate express time (corner of crank) t.
In beginning during burner oil,, then can alleviate diesel knock, just can suppress the rising of the interior combustion temperature of cylinder thus if with the characteristic that fuel injection amount is increased.Therefore can reduce the nitrogen oxide in the exhaust.Again owing to when stopping to spray, carry out the fast shut-off of fuel, thereby the partial combustion in the later stage that can prevent to burn, hydrocarbon or black smoke in the exhaust can be reduced.
Below, with reference to Fig. 8-Fig. 9 another mode of execution is described.As Fig. 8 and shown in Figure 9, this mode of execution is to have the restricting orifice 52 in hole 56 in the intake section configuration of hydraulic jack 51, and overlaps ground configuration control board 68.Form a pair of central side recess 69, the mutual eccentric opening 70 of symmetry prejudicially that forms with respect to its central part on this control panel 68, the intake section of these eccentric openings 70 is communicated with below, and is connected these eccentric openings 70 by the path 71 on the direction that is connected with central side recess 69.
Like this, as shown in Figure 9, the intake section that is configured in hydraulic jack 51 after control panel 68 coincidences of restricting orifice 52 and recess 69 with formation vortex chamber, because nozzle needle 41 is under the state that is pressed on the valve seat 42, so make that this nozzle needle 41 rises, during the beginning burner oil, just make the downside of fuel from Fig. 9 in the hydraulic jack 51 to aperture 56 ground of upside ground, the recess 69 of eccentric opening 70, central side by control panel 68 and restricting orifice 52 from the downside side flow that makes progress.
At this moment, when fuel when the eccentric opening 70 of control panel 68 path 71 by the direction that is connected with central side recess 69 flows, in the liquid stream at recess 69 places, produce eddy flow,, be accelerated during at aperture 56 places of restricting orifice 52 by the character of free vortex flow by throttling.By such acceleration, make the center of vortex chamber 69 that the adverse current zone take place, thereby reduce the stream basal area effectively.
This eddy current as shown in Figure 9 only takes place when fuel is above hydraulic jack 51 leads to, applying fuel to hydraulic jack 51, nozzle needle 41 is pressed on the valve seat 42 and when stopping burner oil, because the aperture 56 of restricting orifice 52 is littler than the vortex chamber 69 of control panel 68, eddy flow does not take place in the flowing of fuel, the stream basal area just equates with aperture 56 areas of restricting orifice 52 that when pressing nozzle needle 41, the energy of flow of fuel in hydraulic jack 51 promptly carried out.
If the fuel the when fuel pressure in the bright in theory hydraulic jack 51 is removed flows, and then is as described below.As shown in figure 10, the diameter that fluid is passed through is the pressure reduction of front and back of the throttle orifice of d when being taken as Δ p, obtains [formula 1] by bernoulli principle.Wherein, when getting [formula 2], then obtain [formula 3], [formula 4], wherein, because Δ p=p1-p2 and Q=AV, thereby obtain [formula 5].
Owing in fact exist flow coefficient c, thereby just obtain [formula b] when counting when this flow coefficient of consideration and with it.
As shown in figure 10, be finish-machined under the circular-arc occasion, then obtain [formula 7] at the knuckle of the intake section of the aperture of restricting orifice.
Then, when being sized to the each several part under the eddy generation occasion as shown in figure 11, flow coefficient c is [formula 8], and the characteristic value K of vortex chamber is then provided by [formula 9], [formula 10], by r
c/ r
cFinish and decide parameter, just can ask c from k.For example in following formula, c is got into 0.2 and when asking k, k=0.23.Therefore obtaining [formula 11] works as r
i=3mm, r
cDuring=0.5mm, Si=1.08mm
2
That is, when getting [formula 12],, just can flow velocity be reduced to 1/5 by the flow direction of liquid stream by the vortex of affix with respect to the throttle orifice of 0.5mm.
Below, with reference to Figure 13-Figure 17 another mode of execution is described.This mode of execution is the intake section at the hydraulic jack 51 that piston 50 can be contained in slidably the inside, along restricting orifice 52 that is disposing center hole 56 up and down respectively and the restricting orifice 53 that center hole 57 is arranged.Wherein, restricting orifice 53 pressed to the below by the effect of spring 74, and therewith relatively, the restricting orifice 52 of upside pressed to the top by the effect of spring 73.The feature of this mode is that the restricting orifice 52 that is positioned at upside not only has center hole 56 but also is provided with longitudinal furrow 72 especially at outer circumferential side.
In this structure, establishing when spraying, because the piston 50 by hydraulic jack 51 is applied to power downwards on the nozzle needle 41, bigger than the power upward that is accompanied by fuel pressure that is applied on the nozzle needle 41, thereby nozzle needle 41 is pressed on the valve seat 42.
At this moment, be arranged on the state that the up and down a pair of restricting orifice 52,53 of the intake section of hydraulic jack 51 is in respectively as shown in figure 15, static under the state that the restricting orifice 53 of downside joins in the upper end with hydraulic jack 51; The restricting orifice 52 of upside is static under the state that joins with stepped part 75.At this moment, three-way valve 59 is in the state shown in Fig. 2 A, applies fuel pressure to the piston 50 of hydraulic jack 51, and fuel passage 65 is cut off.
Then, when the beginning burner oil, shown in Fig. 2 B, 59 paths to the upside fueling of hydraulic jack 51 of three-way valve cut off, and path 65 is communicated with, thereby make fuel leak.At this moment, rise owing to the effect by fuel pressure makes nozzle needle 41, thereby piston 50 is also risen, the restricting orifice 53 that makes downside overcomes spring 74 and acts on and rise as illustrated in fig. 16.
But at this moment, the restricting orifice 52 of upside is in and stepped part 75 contacted states, and the longitudinal furrow 72 on the periphery by stepped part 75 obturations.Therefore, the center hole 56 of the small size that fuel can only be by restricting orifice 52 escapes into the top, thereby makes the rate of climb of nozzle needle 41 slack-off.Just Spraying rate reduces therefrom, can prevent diesel knock, thereby can suppress fuel temperature, can reduce the quantity of the nitrogen oxide in the exhaust.
When stopping burner oil, shown in Fig. 2 A, the fuel passage 65 of three-way valve 59 to be cut off, fuel pressure is applied on the piston 50 of hydraulic jack 51, and nozzle needle 41 is descended.At this moment, the restricting orifice 52 of upside is descended as illustrated in fig. 17, the upper limb of the longitudinal furrow on the periphery 72 is open, thus make the fuel pressure restricting orifice 53 of quantity sufficient, and the center hole 57 by this restricting orifice 53, the fuel of quantity sufficient is flow in the hydraulic jack 51.Therefore, can be promptly apply fuel pressure to the piston 50 of hydraulic jack 51, can be with the fuel fast shut-off.Therefore, fuel can cut off well when spraying end, can improve fuel cost, and hydrocarbon or black smoke in the exhaust are tailed off.[formula 1]
[formula 2]
v
1 0[formula 3]
[formula 4]
[formula 5]
[formula 6]
[formula 7]
C 1[formula 8]
[formula 9]
[formula 10]
[formula 11]
[formula 12]
S
i1.08mm
2
Claims (3)
1, the sparger used of a kind of burner oil, it is to be provided with hydraulic jack in nozzle body, by the piston of this hydraulic jack nozzle needle is pressed on the valve seat and the injection of fuel shutoff, and when removing the hydraulic pressure of above-mentioned hydraulic jack, above-mentioned nozzle needle mentioned and carry out that fuel sprays by fuel pressure, it is characterized in that:
It is that the many pieces of restricting orifices that have an aperture are provided on the intake section of above-mentioned hydraulic jack with overlapping, and above-mentioned aperture is with respect to the edge chamfering in above-mentioned hydraulic jack, the outside or formation curved surface.
2, the sparger used of a kind of burner oil, it is to be provided with hydraulic jack in nozzle body, by the piston of this hydraulic jack nozzle needle is pressed on the valve seat and the injection of fuel shutoff, and when removing the hydraulic pressure of above-mentioned hydraulic jack, above-mentioned nozzle needle mentioned and carry out that fuel sprays by fuel pressure, it is characterized in that:
It is that control panel and restricting orifice are provided on the intake section of above-mentioned hydraulic jack with overlapping, above-mentioned control panel is the inner vortex chamber that forms, above-mentioned restricting orifice is the aperture that central part is provided with the gateway that constitutes above-mentioned vortex chamber, and with respect to control panel, be configured in above-mentioned oil cylinder opposition side on.
3, the sparger used of a kind of burner oil, it is to be provided with hydraulic jack in nozzle body, by the piston of this hydraulic jack nozzle needle is pressed on the valve seat and the injection of fuel shutoff, and when removing the hydraulic pressure of above-mentioned hydraulic jack, above-mentioned nozzle needle mentioned and carry out that fuel sprays by fuel pressure, it is characterized in that:
It is that central part is had the restricting orifice that aperture and periphery have longitudinal furrow, and be provided in the intake section of hydraulic jack with respect to the spring that above-mentioned restricting orifice is pushed on stepped part ground, and above-mentioned step part is the longitudinal furrow of inaccessible and hydraulic jack opposition side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96114064A CN1072770C (en) | 1996-12-19 | 1996-12-19 | Injection device for injection of fuel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96114064A CN1072770C (en) | 1996-12-19 | 1996-12-19 | Injection device for injection of fuel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1185525A true CN1185525A (en) | 1998-06-24 |
| CN1072770C CN1072770C (en) | 2001-10-10 |
Family
ID=5121907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96114064A Expired - Fee Related CN1072770C (en) | 1996-12-19 | 1996-12-19 | Injection device for injection of fuel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1072770C (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101529079B (en) * | 2006-10-23 | 2012-06-06 | 罗伯特·博世有限公司 | Fuel injection valve device |
| CN102828872A (en) * | 2006-03-03 | 2012-12-19 | 甘瑟-许德罗玛格股份公司 | Fuel injection valve for internal combustion engines |
| CN103977922A (en) * | 2008-10-22 | 2014-08-13 | 格瑞克明尼苏达有限公司 | Portable airless sprayer |
| CN104806399A (en) * | 2015-04-03 | 2015-07-29 | 西安交通大学 | High-pressure common rail fuel injector control valve directly driven by end face cam rotary servo motor |
| US9545643B2 (en) | 2008-10-22 | 2017-01-17 | Graco Minnesota Inc. | Portable airless sprayer |
| CN110312861A (en) * | 2017-02-14 | 2019-10-08 | 罗伯特·博世有限公司 | The low tension loop of restricting element and the fuel injection system with restricting element |
| CN110848060A (en) * | 2019-10-14 | 2020-02-28 | 中国北方发动机研究所(天津) | Electric control pressure accumulation oil sprayer |
| US10926275B1 (en) | 2020-06-25 | 2021-02-23 | Graco Minnesota Inc. | Electrostatic handheld sprayer |
| US10968903B1 (en) | 2020-06-04 | 2021-04-06 | Graco Minnesota Inc. | Handheld sanitary fluid sprayer having resilient polymer pump cylinder |
| US11707753B2 (en) | 2019-05-31 | 2023-07-25 | Graco Minnesota Inc. | Handheld fluid sprayer |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4164326A (en) * | 1978-04-06 | 1979-08-14 | General Motors Corporation | Electromagnetic fuel injector nozzle assembly |
| SU909262A2 (en) * | 1980-04-02 | 1982-02-28 | Коломенский Филиал Всесоюзного Заочного Политехнического Института | Injection nozzle with hydraulic locking of needle |
| SU1038527A2 (en) * | 1982-03-29 | 1983-08-30 | Коломенский Филиал Всесоюзного Заочного Политехнического Института | Injection with hydraulically locking needle |
| JPS60162049A (en) * | 1984-02-02 | 1985-08-23 | Diesel Kiki Co Ltd | Fuel injection valve controller |
-
1996
- 1996-12-19 CN CN96114064A patent/CN1072770C/en not_active Expired - Fee Related
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| CN102828872A (en) * | 2006-03-03 | 2012-12-19 | 甘瑟-许德罗玛格股份公司 | Fuel injection valve for internal combustion engines |
| CN101529079B (en) * | 2006-10-23 | 2012-06-06 | 罗伯特·博世有限公司 | Fuel injection valve device |
| US11446689B2 (en) | 2008-10-22 | 2022-09-20 | Graco Minnesota Inc. | Portable airless sprayer |
| CN103977922A (en) * | 2008-10-22 | 2014-08-13 | 格瑞克明尼苏达有限公司 | Portable airless sprayer |
| US9517479B2 (en) | 2008-10-22 | 2016-12-13 | Graco Minnesota Inc. | Portable airless sprayer |
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| US9914141B2 (en) | 2008-10-22 | 2018-03-13 | Graco Minnesota, Inc. | Portable airless sprayer |
| US11759808B1 (en) | 2008-10-22 | 2023-09-19 | Graco Minnesota Inc. | Portable airless sprayer |
| US11623234B2 (en) | 2008-10-22 | 2023-04-11 | Graco Minnesota Inc. | Portable airless sprayer |
| US10919060B2 (en) | 2008-10-22 | 2021-02-16 | Graco Minnesota Inc. | Portable airless sprayer |
| US11446690B2 (en) | 2008-10-22 | 2022-09-20 | Graco Minnesota Inc. | Portable airless sprayer |
| CN104806399B (en) * | 2015-04-03 | 2017-06-06 | 西安交通大学 | The high pressure common rail injector control valve that edge cam rotating servo motor directly drives |
| CN104806399A (en) * | 2015-04-03 | 2015-07-29 | 西安交通大学 | High-pressure common rail fuel injector control valve directly driven by end face cam rotary servo motor |
| CN110312861B (en) * | 2017-02-14 | 2021-08-31 | 罗伯特·博世有限公司 | Throttle element and low-pressure circuit of a fuel injection system having a throttle element |
| CN110312861A (en) * | 2017-02-14 | 2019-10-08 | 罗伯特·博世有限公司 | The low tension loop of restricting element and the fuel injection system with restricting element |
| US11707753B2 (en) | 2019-05-31 | 2023-07-25 | Graco Minnesota Inc. | Handheld fluid sprayer |
| CN110848060B (en) * | 2019-10-14 | 2022-03-15 | 中国北方发动机研究所(天津) | Electric control pressure accumulation oil sprayer |
| CN110848060A (en) * | 2019-10-14 | 2020-02-28 | 中国北方发动机研究所(天津) | Electric control pressure accumulation oil sprayer |
| US10968903B1 (en) | 2020-06-04 | 2021-04-06 | Graco Minnesota Inc. | Handheld sanitary fluid sprayer having resilient polymer pump cylinder |
| US10926275B1 (en) | 2020-06-25 | 2021-02-23 | Graco Minnesota Inc. | Electrostatic handheld sprayer |
| US11738358B2 (en) | 2020-06-25 | 2023-08-29 | Graco Minnesota Inc. | Electrostatic handheld sprayer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1072770C (en) | 2001-10-10 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20011010 Termination date: 20100119 |