DE3335151A1 - Film welding device, especially for domestic purposes - Google Patents

Abstract

The invention relates to a film welding device, especially for domestic purposes, having a pump, from which at least one air channel extends, which air channel encloses a connection nozzle insertable between two films, for example of a film bag. The object is to be achieved of substantially reducing the danger of sucking in filling product and especially of reducing contamination of the air channels and the pump and of improving the cleanability. To achieve this object, it is proposed to dispose a liquid trap (36, 62, 78, 80; 644; 740) in the air channel (22, 12; 640; 730, 732), which allows air to pass easily but liquid to pass only greatly retarded, if at all. <IMAGE>

Description

Foil sealing device, in particular for household purposes

The invention relates to a film sealing device, in particular for household purposes, according to the preamble of claim 1.

Such a film welding device is known from the German Offenlegungsschrift 26 18 581. Here is one, showing an air duct bent at right angles Connection piece for a foil bag through a housing cover wall with one end inserted into a suction chamber formed in the housing. The suction chamber has in the middle of the housing a side suction opening behind the one of one Electric motor driven radial fan is arranged.

With such devices there is the problem that goods to be packaged, in particular liquid is sucked out of the foil bags and the air channels and in particular also dirty the fan and the engine compartment. With the device according to the German Offenlegungsschrift 26 18 581 is a part of the sucked in good sit down in the suction chamber 17.

Device too much good and in particular due to carelessness of the user liquid in the device, it will eventually be relatively low due to the horizontal suction opening sucked in by the blower. In addition, liquid sets in shape particularly fine droplets do not come off, but remain in the airflow in suspension and is sucked in by the fan and contaminates it.

The invention is based on the object of providing a film welding device according to to create the preamble of claim 1, in which the risk of being sucked in of filling material and in particular contamination of the air ducts and the pump is essential reduced and the cleanability improved.

According to the invention, this object is achieved by the combination of features of the characterizing part of claim 1.

The liquid barrier, which can be designed in different ways can be adapted to the suction power or

to train the adjustable suction power to ensure a sufficiently safe Barrier against the passage of water with good air permeability at the same time in normal operation.

The air duct preferably includes a bracket in which to operate The liquid barrier is removable for cleaning or replacement purposes is. A common one can be used for preferably parallel suction and pressure channels Be arranged lock, which is operationally expandable as one piece.

A section of the air duct, in particular the The connection piece is detachably attached to the device during operation and contains the liquid barrier (Claim 3). This makes it easier to clean the device and to clean or

the replacement of the liquid barrier.

A filter can serve as a liquid barrier (claim 4).

The filter preferably consists of an expressible and expedient one Washable elastic, porous material that is absorbed after being pushed out Liquid and / or Can be washed out and pressed out again immediately is. Alternatively, however, a disposable filter can be used, which as soon as its flow resistance for air has decreased too much due to the absorbed liquid is exchanged for a new one. Commercially available filters can be used as such filters Tobacco filters, especially cigarette filters, which have the advantage to be easily available.

The filter can protrude a little from the end of the connecting piece. On the one hand, this has the advantage that it can be easily grasped and cleaned or cleaned Exchange purposes can be pulled out of the connection piece and on the other hand indicates by discoloration whether and to what extent it is wetted with liquid.

The connection piece can, however, also be approximately parallel to the direction of air movement have extending access opening closable by means of a closure element, behind which the filter is arranged. Such film sealing devices are known where the connection piece, which is also referred to as a nozzle, in one section seen transversely to the direction of flow, has a U-shaped profile that opens downwards and during operation on the underside of the contact surface of the device on the cover side for the foils is closed.

A lower clamped one below also forms over sub-areas Foil a boundary that closes the air duct of the connection piece. At this Embodiment, the filter can be particularly simple, e.g. after being folded up of the connecting piece. There are also known film sealing devices that in the case of such connecting pieces, which are open at their underside, protruding downward Have mandrels, the one below when the connection piece is moved into the operating position Pierce the lower foil and hold it in place. Such mandrels can be particularly simple Holders for the filter are used by having it prepared with or without it Openings on the thorns being speared.

The air duct can have a window through which the filter is visible is (claim 9) so that the degree of wetting of the filter is optically controllable.

According to a preferred embodiment is a liquid barrier arranged between a settling space for the liquid and the pump (claim 10). This settling space will at least contain the larger particles of the air flow absorb entrained good. Its separation effect can be achieved through various internals, such as through-flow sieves or labyrinths can be improved, with these internals are expediently arranged to be operationally removable for cleaning. Of the In order to have as large a storage volume as possible, one in his sedimentation room Have an outlet opening for the air arranged in the upper area. One can its side walls be kept a little lower and an overflow channel into one Form the adjacent room of the device, from which the fan draws in the air. Even this second room can form an additional settling room, but this is due to the suction opening of the fan, which is arranged at a relatively low height, is less Has storage capacity for separated goods.

A valve, preferably a float valve, can also be used as a liquid barrier serve, which is actuated by the liquid level in the settling space (claim ii). this enables very simple, practical designs. E.g. as a valve body directly a buoyant and preferably elastic ball or roller, e.g. are removably arranged in a cage.

The settling space is preferably in an operationally removable space from the device Container formed (claim 12) and may have a window with a Housing opening or

corresponds to a window in the housing and a visual control the degree of filling allowed. In particularly expedient forms that the container contained in the settling space a structural unit with the connecting piece and can be removed from the device together with this. In this way, the entire air duct with all air barriers contained therein from the rest, the electrical components, such as, for example, the device containing the motor and sealing bar is removed and conveniently located under running water or be cleaned in the dishwasher (claim 13). Alternatively or additionally, the top wall of the settling space can act as a liquid barrier a liquid- and airtight barrier wall up to the upper edge of the lower one The delimitation of the air outlet opening of the sedimentation area protrudes downwards (claim i4). As soon as the liquid level in the settling chamber is the lower edge of the barrier wall approaches, the air flow is greatly restricted and, if it rises further, it is finally reduced stopped completely. The barrier wall must be sufficiently far below the level of the lower edge of the The air outlet opening of the sedimentation chamber protrudes to prevent liquid from flowing over to avoid over this edge, as the pump, e.g. in the form of a fan, depending on The suction power will slightly increase the water adjacent to the outlet opening.

In a space arranged between the settling space and the pump can an additional liquid barrier in the form of a filter can be arranged (claim 16). This filter acts as a blower protection filter. The filter can either be releasably attached to the removable container containing the settling space, whereby it is accessible for cleaning on the one hand, but on the other hand the danger there is that when emptying the settling space additional liquid into the filter device. It can therefore be useful to have this filter removable by itself to arrange in the housing part containing the electrical components or to place it in a separate slot for occasional items that can be removed from this housing part To accommodate cleaning or replacement.

According to a further embodiment for which an independent protection is stressed regardless of a liquid barrier in the air duct, the effective suction or blowing power can be adjusted at the connection piece. According to a structurally particularly simple embodiment is the air output by an adjustable Ancillary air opening in the air duct or the pump can be adjusted. In a radial fan the secondary air opening can be achieved by having a cantilevered and Radial fan wheel open on one side, e.g. together with the driving electric motor pushed more or less close to a housing wall containing the suction opening will. Furthermore, especially when using a pump in the form of a fan, the air output or the air pressure through a pressure relief valve with adjustable Opening pressure can be set. This valve can be placed directly in the air flow or be arranged in the secondary air opening. These suggestions apply to both Suction air channels as well as for compressed air channels. In the case that these two channels at least are combined over part of their course, two can be next to each other in different Direction opening overpressure valves can be arranged. The air ducts can also adjustable throttling devices of a different type included. In the case of use a piston pump or a diaphragm pump can with a constant delivery stroke the entire space of the cylinder can be enlarged, reducing the delivery rate for compressible media how air can be changed. Of course, there are also various electrical or electronic ones Adjustment or control devices can be used on the electric drive motor the pump and can contain control loops.

According to a preferred embodiment, the air flow or the suction resistance can be measured and in the event of a sudden decrease in Air flow or in the event of a sudden drop in pressure caused by the product being sucked in, the engine power is suddenly reduced or completely by electrical means switched off and a timer are set in motion after a predetermined time controls the drive motor back to full power or the preselected power. This has the advantage that, on the one hand, when the connection piece is blocked by the sucked-in material the material is no longer sucked in and, on the other hand, the operator e.g. through the lowering of the engine noise is made aware of the operating error and until the timer expires, the arrangement of foil bags and Foil sealing device to change relative to each other and the contents up close to remove the connecting piece. The air pressure can e.g. by means of a per se known pressure-sensitive switch and the flow by means of a in the closing direction pre-tensioned air flap pushed open by the air flow and actuating a switch or a heated wire cooled by the air flow.

In the following, exemplary embodiments of the invention are illustrated schematically Drawings explained in more detail.

It shows: FIG. 1 a plan view of a film welding device, wherein the pressure bar is omitted for simplicity; Fig. 2 is a section essentially along the line II-II in Fig. 1; Fig. 3 in an enlarged view of a section in a section essentially along the line II-II a second position of the Jet; 4 shows an enlarged section of a section essentially along the line IV-IV in Fig. 1; Fig. 5 is a section essentially along the line V-V in Figure 4; FIG. 6 in a section corresponding to that of FIG. 3 shows a modified embodiment of a connecting piece and FIG. 7 in a section Another modified embodiment approximately parallel to the contact surface of the device a connection piece.

The film welding device shown in Figures 1 to 5 has a base housing 2 with a top wall 4, the top side as a contact surface for the foils to be welded or

a foil pouch 6 to be welded shut is used. Along the in Fig. 1 lower front edge of the top wall 4 extends a heating wire on the top 8, on which the foils are vertically displaceable for welding by means of a not shown Pressure bar are pressed in a known manner. A bottom 10 of the housing extends over its entire base, while the top wall 4 behind the Heating wire 8 has a rectangular recess from one narrow-sided end, those from an operationally removable container 12 placed on the floor 10 is essentially completely filled out. The container 12 has a flat lid 14, the surface of which extends as an extension of the surface of the top wall 4 and together with this results in a contact surface that corresponds to the floor plan of the device. In the cover 14, a large rectangular one is adjacent to a front end Opening 16 is formed, next to that in the rear area, i.e. in Figures 1 up to 3 upper area of bearing blocks 18 and 20. A connection piece 22 for the As can best be seen in FIG. 4, the film bag points, in section, transversely to the direction of flow a profile corresponding to an inverted low U, where the free legs form the side walls and with side bearing knobs in storage troughs the bearing blocks 18 and 20 are locked. This connecting piece 22 extends forward beyond the opening 16 in the lid 14 and forms with the open front end 24 a suction nozzle. The open underside of the connecting piece 22 is from the cover 14 closed when the connection piece is folded down completely on its surface is. The profile of the connecting piece 22 is closed at the rear by a wall 26, which cooperates with the rear edge of the opening 16 in a sealing manner. From the the connecting bridge of the U-profile forming top wall 28 of the connecting piece 22 protrudes a mandrel 30 below an angle of 900 away, which is connected to a second, much smaller opening 32 in the cover 14 cooperates around a lower one drawn through under the connecting piece 22 To clamp the film layer 34 of the film bag 6.

An upper film layer 35 is drawn over the connection pieces 22. A the entire cross section of the connecting piece 22 occupying filter 36 in the form of a washable sponge is with a preformed opening over the for it as Hold or the passage channels tion serving mandrel 30 pushed. The porosity / des Sponges 36 are chosen so roughly that there is not only air but also liquid can flow through, but with the impingement of liquid, the flow is strongly braked.

This prevents large quantities of material from being sucked in quickly can be. The operator has time to change the bag or device store in order to keep the goods away from the connection piece again. The structure of the filter 36 is chosen so that when no more liquid is supplied, the liquid is sucked out of the filter for the most part and this again for the flow is free of air.

among other things instead of a sponge-like filter could here / also a sieve may be used with several sieve surfaces arranged one behind the other will. The filter 36 or a sieve inserted in its place, which also represents a filter, serve as a coarse filter.

The container 12 has an actual one closed by the cover 14 Container 38 with a rectangular one resting on the bottom 10 of the base housing Bottom 40, a rectangular front wall 42 protruding perpendicularly therefrom, a rectangular one vertical rear wall 44 and an outer rectangular vertical end wall 46 and an inner end wall 48. The actual container is made of a transparent one Plastic made so that through the outer end wall 46 or the rear wall 44 the parts of the outer wall of the device form the liquid level in the container 12 is visible. The bottom 10 of the base housing 2 has one at its rear At the end of a piece of protruding guide extension 50 to guide the container 12 as well a centering lug 52, which is connected to a recess on the underside of the bottom 40 of the actual container 38 cooperates to center the latter.

The inner end wall 48 of the actual container 38 has approximately in the center a round air outlet opening 54. Between the end walls 46 and 48 is parallel to these the bottom 40 and the front wall 42 and the rear wall 44 connecting, one Partition 56 is formed, the top edge of which, parallel to the cover 14, is somewhat lower lies than the upper edges of the other side walls of the actual container 38. The partition 56 divides the actual container 38 into one under the connecting piece 22 or the rectangular opening 16 in the cover 14 arranged settling chamber 58 and a filter chamber 60 containing the air outlet opening 54. Between the partition wall 56 and the inner end wall 48 extends parallel thereto a filter 62, the with the cover 14 removed in guides 64 and 66 on the front wall 42, the Floor 10 u.

the rear wall 44 are formed, is pushed in and can be operational can be pulled out upwards for cleaning purposes after removing the cover 14. The filter 62 which delimits the entire flow path between said ones Walls occupies, consists of a washable, sponge-like elastic material, the pores of which are so fine that the liquid cannot be caught by the air stream even when the filter is completely clogged with liquid by the suction pressure of the pump is pulled out. This filter 62 represents a fine filter or protective filter for represents the pump to be described.

One extends over the entire depth from the front wall 42 to the rear wall 44 extending valve cage 70 is provided with a crosswise to the partition 56 seen in Section U-shaped end section 72 clamped over the upper end of the partition wall 56 and forms the lower limit of an overflow channel 74, its upper limit the cover 14 forms. A normal closes at the inverted U-shaped end section 72 U-shaped central section, which due to large air passage openings 76 a Forms basket in which a roller body 78 of a float valve can rest. On these The middle section is followed by an outer end section, which in turn is reversed Has a U-shaped profile and rests against the cover 14 with its connecting web. Its outer free leg 80 extends from the front wall 42 to the rear wall 74 from the cover 14 vertically downwards, being a little below the lower limit of the overflow channel 74 protrudes downwards and is liquid-tight without openings Represents transverse wall. The valve roller 78 has an elastic inside Foam core and has an elastic, liquid-tight skin and on the outside is much lighter than water, so that there is only a little floating on it Piece is immersed.

The valve roller 78 is cylindrical in shape and extends in parallel to the partition wall 56 up to each close to the front wall 42 and the rear wall 44 of the container and lies free in the valve cage 70.

The top wall 4 and the bottom 10 of the base housing 2 are with one another connected by a continuous front wall 82, one not shown right side wall, a rear wall 84 extending to the container 12, to the at a 0 angle 90 one adjoins the inner end wall 48 of the container 12 adjacent transverse wall 851 and a longitudinal wall adjoining it at right angles 86, which extends parallel to the front wall 42 of the container 12 and in turn through a narrow end wall, not shown, adjoining it at right angles the front wall 82 is connected. The transverse wall 85 has one with the outlet opening 54 of the container 12 communicating round suction opening 88, behind which a radial fan wheel 90 is arranged overhung on the shaft 92 of an electric motor 94. The fan wheel 90 represents the pump of the device in this case. The sucked air can through Openings 96 in the bottom 10 escape from the interior of the base housing 2.

The lid 14 of the container 12 has one adjacent to the inner one End wall 48 extending slot-like through opening 98 for regulating the suction force on the connecting piece 22, which is connected to a socket in a manner not shown 2 slidably guided control slide 100 interacts. In a modification of the one shown In the embodiment, it may be expedient for the control slide on the cover 14 to be displaceable to lead so that it interferes with the removal of the container 12 less.

The film sealing device according to Figures 1 to 5 works like follows: Depending on the product to be welded in, the appropriate suction force or suction power is used preselected by setting the control slide 100 on the secondary air opening 98. Then a film bag 6 is pulled over the connecting piece 22 and on the top wall 4 and the cover 14 of the device aligned. Then by means of a not shown Switch of the electric motor 94 switched on and thus the radial fan 90 started and air sucked out of the foil bag. The airflow flows first through the coarse filter 36, which allows liquid to pass through, but strongly brakes and thus prevents large quantities of product being sucked in. Entrained by the filter 36 Liquid can settle in the settling space 58 in which the flow is deflected. The air flows through the openings 76 of the valve cage 70, the overflow channel 74, the filter chamber 60 and the filter 62 and the outlet opening 54 to the radial fan 90 to. Small drops of liquid that may still be entrained in the air stream are removed by the fine filter 62 collected. If there is gradually a larger amount of fluid has collected in the settling space 58, it carries the roller-shaped valve body 78 upwards until it finally completely closes the overflow opening 74 and so that the work stops. The container 12 must then be removed from the base housing 2 and opened for cleaning.

A suitable design of the valve cage 70 can bring about that the air flow suddenly pulls the valve body 78 with it and against the Overflow opening 74 pulls it over a certain point as soon as the settled liquid pulls it over Level has increased. In the event that valve body 78 due to poor cleaning is stuck in the valve cage 70, offers the downwardly projecting wall 80 of the valve cage 70 an additional security, since it restricts the flow strongly or interrupts it completely, when the liquid level has risen above its lower edge. When including For some filling goods, it may be useful to place the coarse filter 76 in the connecting piece 22 should be omitted if it clogs too quickly due to good parts carried along and thus hinders work.

In the embodiment of Figure 6, the device is essentially as known from German Offenlegungsschrift 26 18 581. In a Top wall 604 one Base housing is a connection piece 622 for a film bag 606 guided away from the top wall or slidably towards the top wall. The connection piece 622 has a rearward, the top wall 604 penetrating Connection section 630, from which an im Cross-section of flat rectangular tube 632 extends with a parallel to the top wall 604 extending bottom wall 634, from which a mandrel 636 protrudes downward, which for Perforating and holding the clamped between top wall 604 and bottom wall 634 The lower film of the film bag 606 is used. The bottom wall 634 and the top wall 632 of the connecting piece together with side walls 638 form a suction channel 640, in from the front end to one of the top wall 640 protruding a little downwards Stop 642, a filter 644 corresponding in cross section to the suction channel 640 is inserted is. The suction channel 640 has a slightly funnel-shaped at its front end Extension 646 to facilitate the insertion of a filter 644. The filter 644 is longer than the distance between the stop 642, measured in the direction of flow and the front end of the suction tube 632, so that it is a little forward in use protrudes and is easily exchangeable. As is the case with the foil bags in general are transparent, the front end of the filter as well as through the transparent one End section 643 of the top wall 632 also has its rear end checked for coloring ingested liquid can be monitored. The filter is washable, elastic Sponges formed with such a cell structure that it is usually found in The suction pressures used do not allow liquid to pass through, or only to a very small extent leaves. This filter 644 largely prevents all contamination of the air duct. It can be of particular advantage to use such a filter with a connection piece, as shown in Figures 1 to 4, to be used, as there is particularly easy also the walls surrounding the filter, which can be wetted by liquid, are cleanable.

In a modification of the embodiment shown, the connecting piece have a circular cross-section suction channel, in the as in the embodiment According to FIG. 6, a commercially available cigarette filter can be partially inserted from the front end is.

The modified connection piece shown in a highly schematic manner in FIG 722 has a suction channel 730 and next to it a blowing channel 732, which through a Partition wall 734 are divided into a connecting piece 722. The partition 734 extends does not extend to the front end 736 of the connecting piece 722 and forms with her Front end 738 a stop for a filter 740 penetrating both channels, which has the same function and structure as the filter 644 according to FIG. In the blowing operation there is no risk of filling material being sucked in, however it is also advisable to have a blower duct to prevent contamination from spraying into it Well to protect. It is known to alternate a connection piece with a channel to be connected to the suction or discharge side of the pump. In this case, the Filters arranged in the connection piece to protect against contamination in both operating modes.

In the above description it was assumed that the The top side of the device, which forms the contact surface for the foils, is arranged horizontally is. The devices described can, however, also have a vertically extending top wall or contact surface can be used. The filters are largely independent of their position. Of the Liquid settling space with the float valve, which is shown in particular in FIG is, would have to be arranged pivoted by 900 about the longitudinal axis in order to not to impair the function of the float valve and the connecting piece would then have to be in the rearmost or uppermost area of the top wall or the lid of the open into the inserted container. When arranging the Overflow opening in the rear upper corner is also with a corresponding design of the valve an operation with either a horizontal or vertical or inclined contact surface possible for the foils.

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Claims (19)

Claims 1. Foil sealing device, especially for household purposes, with a pump from which at least one air duct goes out, the one between two Foils, for example a foil pouch, comprises insertable connecting pieces, d a d u notices that in the air duct (connecting piece 22, container 12; Suction channel 640; Suction channel 730, blowing channel 732) a liquid barrier (filter 36, 62, float valve 78, barrier wall 80; Filter 644; Filter 740) is arranged. 2. Foil welding device according to claim 1, characterized in that the air duct has a holder (mandrel 30, valve cage 70, retaining cheeks 64, 66; suction duct 640; Connection piece 722) has the liquid barrier (filter 36, 62, float valve 78, barrier wall 80; Filter 644; Filter 740) is removable for operational use. 3. Foil sealing device according to claim 1 or 2, characterized in that that a section of the air duct, in particular the connecting piece (22; 622; 722) is operationally releasably attached to the rest of the device and has the liquid barrier. 4. Foil sealing device according to one of claims 1 to 3, characterized in that that a filter (# 6, 62; 644; 740) serves as a liquid barrier. 5. Foil welding device according to claim 4, characterized in that the filter is an elastic, porous one that can be squeezed out and preferably washed out Material, e.g. a sponge. 6. Foil sealing device according to claim 4 or 5, characterized in that that the filter (644) protrudes a piece from the end of the connecting piece (622). 7. Foil sealing device according to claim 4 to 6, characterized in that that the connecting piece (22) has an extending approximately parallel to the direction of air movement, has closable access opening by means of a closure element (cover 14), behind which the filter (36) is arranged. 8. Foil welding device according to claim 7, characterized in that the connecting piece (22) is arranged on the device so as to be movable relative to the latter is and as a closure element a part (cover 14) of the film contact surface of the device serves. 9. Foil sealing device according to one of claims 4 to 8, characterized in that that the air duct (suction duct 640) has a window (643) through which the filter (644) is visible. 10. Foil sealing device according to one of claims 1 to 9, characterized in that that a liquid barrier (filter 62, float valve 78) between a settling space (58) for the liquid and the pump (impeller 90) is arranged. 11. Foil sealing device according to one of claims 1 to 3 or 10, characterized characterized in that a valve, preferably a float valve, is used as the liquid barrier (78) which is actuated by the liquid level in the settling space (58) is used. 12. Foil sealing device according to one of claims 1 to 11, characterized characterized in that a settling room (58) is operational in one of the rest of the device removable container (12) is formed. 13. Foil welding device according to claim 12, characterized in that the container (12) containing the settling space (58) is a structural unit with the connecting piece (22) and can be removed together with this from the remaining device. 14. Foil sealing device according to one of claims 10 to 13, characterized characterized in that as a liquid barrier one of the top wall (cover 14) of the Downwardly protruding liquid- and airtight barrier wall (80) serves, which extends to below the upper edge of the lower limit of an air outlet opening (74) of the settling space (58) extends downwards. 15 film welding device according to one of claims 10 to 14, characterized characterized in that the settling space (58) has a window (rear wall 44, outer end wall 46) and the device housing (base housing 2) have a corresponding opening having. 16. Foil sealing device according to one of claims 1 to 15, characterized characterized in that in one between the settling space (58) and the pump (impeller 90) arranged space (filter space 60) arranged as a liquid barrier a filter (62) is. 17. Foil sealing device according to one of claims 4 to 16, characterized characterized in that the filter (36) is so large-pored that the pump (impeller 90) Can and preferably suck liquid, especially water, through it a settling space (58) is arranged downstream of the filter. 18. Foil sealing device, in particular according to one of claims 1 to 17, characterized by an adjusting device (secondary air opening 98, control slide 100) for the suction or blowing power effective at the connection piece (22). 19. Foil welding device according to claim 18, characterized in that an adjustable secondary air opening as a setting device (secondary air opening 98, Control slide 100) is used in the air duct or in the pump.