EP2151280A2 - Pump device and method for operating a pump device - Google Patents

Abstract

The device has liquid branching pipes (20, 21), and an inlet valve (2) arranged between a liquid input pipe (6) and a pump chamber (3). An outlet valve (4) is arranged between the pump chamber and a liquid outlet pipe (7), where input- and output valves are self-closable. The liquid branching pipes stand in liquid-connection with the liquid outlet pipe and/or the pump chamber. A branch-off valve is designed as a material deformation valve, and a liquid opening is released by material deformation of elastic material. An independent claim is also included for a method for operating a pump device.

Description

The invention relates to a pump device for Flüssigkeitszerstäubervorrichtungen, which has at least one fluid input line, at least one pumping chamber and at least one fluid outlet line, and at least one input valve between at least one fluid inlet line and at least one pumping chamber and at least one output valve between at least one pumping chamber and at least one fluid outlet line , Furthermore, the invention relates to a liquid atomizer and a scenting device. Moreover, the invention relates to a method for operating a pumping device.

In many applications, it is necessary to pump relatively small amounts of liquid while bringing it to a relatively high pressure. This is the case, for example, in so-called pump atomizers. For example, by a user through a mechanical operation pumped a small amount of liquid to a corresponding pump, thereby pressurized, and ejected in the direction of a nozzle head. At the nozzle head, the pressure of the liquid causes a sputtering of the same into many small to smallest drops. The liquid is thus broken up into a mist of minute liquid droplets, often referred to as sputtering.

Such pump sprayers, since they are often disposable, must be relatively simple and inexpensive to build. Nevertheless, the pump sprayers should work reliably. If possible, the pump sprayers should also meet relatively high hygienic requirements. Furthermore, such pump sprayers should be as universally usable.

Over the years, a wide variety of detailed designs of such pump atomizers have become known. For example, in DE 101 54 237 A1 discloses an atomizer which is manually operable. The nebulizer includes a spring acting as a compression spring energy storage and a cylinder and a piston, two channels and two valves. The sputtering can be initiated by triggering a locking mechanism by hand. The energy storage is located outside of the reservoir for the liquid. In the energy storage mechanical energy can be supplied by hand. The distribution of the droplet size in the atomizer jet is independent of the experience and behavior of the person operating the atomizer; it can be adjusted reproducibly.

Although such pump sprayers are well functioning, there is still a potential for detail improvements. A problem that has not yet been solved is, for example, a cost-effective one Pump atomizer for very small fluid output quantities to construct.

Known systems are designed so that a minimum application rate of about 30 microliters can not be undershot production technology. A significant reduction of these application rates is not possible without functional impairment by a stroke limitation of the pump in most cases. Also, it is hardly possible to reduce the geometry of the arrangement such that the minimum application rate is significantly reduced.

However, there are applications in which it is necessary or desirable to discharge smaller amounts of liquid. An example of this is, for example, scenting devices for motor vehicles. Here it is desirable to discharge very small amounts of liquid, so that the fragrance can be concentrated higher, and thus the reservoir must take up less space.

If very small amounts of liquid are to be sprayed, special micropumps or nebulizers based on piezos have hitherto usually been used. However, these technologies are not available by default and are also expensive.

Another problem with many known pump atomizers is moreover that they are sensitive to position. As a result, the function of the pump sprayer is guaranteed only within a relatively narrow angular range about the vertical. However, if the position of the pump atomizer differs significantly from it, a reliable function of the pump sprayer is often no longer guaranteed. This is undesirable by nature.

The object of the invention is thus to propose a pumping device for Flüssigkeitszerstäubervorrichtungen, which is as universally applicable. In addition, the object of the invention is to propose a liquid atomizer which is as universally usable as possible and a scenting device which is as universally usable as possible. Furthermore, the invention consists in proposing an improved method for operating a pumping device.

It is proposed, a pumping device for Flüssigkeitszerstäubervorrichtungen having at least one fluid input line, at least one pumping chamber and at least one fluid outlet line, and disposed between at least one fluid input line and at least one pumping chamber at least one input valve and between at least one pumping chamber and at least one fluid outlet line at least one output valve is to be formed such that at least one fluid branch line is provided. With the aid of the fluid branch line, it is possible to divert a portion of the fluid being pumped or the fluid still to be pumped instead of delivering the corresponding fluid to the fluid exit line and, in turn, to a "consumer". The branched off fluid can be used, for example, for other purposes or, in particular, can be returned to a suction region where it can again be available to the pump device. Thus, only a portion of the fluid is "effectively", ie spent on the actual "consumer". In turn, the discharged fluid quantity can be reduced in a particularly simple manner. This makes it possible, in particular, to be able to continue to use pumping devices with a substantially "classic" design. Due to the proposed modification, however, these may "pump" or discharge significantly smaller amounts of liquid under certain circumstances. Since the proposed modification can be carried out very inexpensively, thereby a very cost-effective pumping device can be realized which, however, can handle very small to very small amounts of liquid. The ratio of effectively discharged fluid and branched fluid can be ensured by appropriate measures, such as in particular by a corresponding dimensioning of the fluid resistance of the "consumer" and the fluid resistance of the fluid branch line. For example, it is possible to suitably dimension the length or the diameter of the fluid branch line. A fluid is to be understood as meaning, in particular, liquids, gases, liquid-gas mixtures and supercritical fluids. Optionally, the fluids may also contain, to some extent, solids in the form of suspended solids (eg, smoke, suspensions).

Alternatively or additionally, it is possible that at least one valve, in particular an input valve and / or an outlet valve of the pump device is designed as a self-closing valve, in particular designed as a force-loaded valves. For example, it can be avoided that ball valves can fall out of their closed position in the event of an "overhead position" of the pumping device, and thus can no longer effect a fluid closure. The self-closing function can be realized in a simple way by acting on the preform body of the valve with a force which is effected or mediated, in particular, by means independent of the closure body. The application of force can be selected such that it is slightly larger than a gravitational force and / or acceleration force acting on the closure body (eg caused by impacts, centrifugal forces, deceleration forces, etc.).

It may prove useful if at least one self-closing valve is spring loaded and / or magnetic. A force application of the closure body of the self-closing valve, for example, by means of a spring (in particular by means of a coil spring) particularly simple and inexpensive, but still very reliable realized. It is also possible to close the self-closing valve by means of magnetic forces. For example, it is possible that the valve closure body is designed as a permanent magnet and the magnetic fields generated by the permanent magnet interact with other assemblies of the valve, which may be made in particular of a ferromagnetic material. Of course, it is also possible conversely that the permanent magnet is designed in conjunction with other assemblies of self-closing valve, and the magnetic fields generated by this with the valve closure body, which is made for example of a ferromagnetic material, interact. Particularly advantageous in an embodiment with magnetic forces, it may be that the fluid channel can be kept free of fluid flow obstructing internals substantially.

In particular, it is advantageous if at least one fluid branch line is in fluid communication with at least one fluid outlet line and / or at least one pumping chamber. Experiments have shown that such an arrangement can be realized in a particularly favorable manner without the functionality of the pump device having to suffer. Incidentally, it is particularly advantageous if the fluid branch is in fluid communication with at least one fluid outlet line. Here it is possible to carry out the fluid branching line in the form of a simple opening (for example by means of a bore, an orifice element, etc.).

It is also possible that at least one fluid branch line is provided with at least one branch valve. Such a design is particularly useful when the fluid branch line is in fluid communication with at least one pumping chamber. Here, tests have shown that the provision of a branch valve can prevent problems with the suction process (filling the pumping chamber) particularly effective. Thereby, a functional impairment of the pumping device can be prevented in a simple manner particularly effective. However, it is also possible to provide branch valves even if the fluid branch line communicates with other elements, such as a fluid exit line. Here it is possible, for example, to effectively prevent a fluid kickback, which could adversely affect the pumping behavior of the pumping device.

It is also possible that at least one valve, in particular at least one branch valve, is designed as a material deformation valve, in which a fluid opening is released by a material deformation of an elastic material. With the proposed embodiment, it is particularly possible to realize a special simple and inexpensive but still reliable valve. In particular, it should be noted that pumping devices are often designed as a disposable component, and therefore problems with material fatigue phenomena play a relatively minor role in the rule. A possible construction results, for example, when a provided with one or more openings tubular element is provided with an elastic hose pushed over it. When pressure is applied to the inside of the tube, the tube expands and, when a certain pressure difference is exceeded, allows fluid to escape from the tube interior to the outside. In the reverse direction, however, a fluid passage is effectively prevented.

A meaningful training opportunity may result if at least one fluid branch line is formed in multiple stages. This can be realized, for example, by connecting a plurality of openings or orifice devices in series. In each case a kind of intermediate chamber can be provided between the individual openings. It is also possible, moreover, that the respective geometric position of the passage openings is offset from one another (for example in the axial, radial and / or angular respect). With such a construction, it is possible, for example, to realize a fluid branch line, which has a relatively high flow resistance for passing through fluid, but is still made compact and has a relatively small space.

In addition, it can be advantageous if a defined proportion of pumped and / or still to be pumped fluid is branched off via the fluid branch line. This can be done, for example, by appropriately adjusting the fluid resistance of "consumer" and fluid branch line. For example, if the fluid branch line is designed as an opening, its fluid resistance over the length and diameter of the opening (possibly also on the number of parallel and / or serially arranged openings) can be adjusted. It is particularly advantageous if the portion of the branched off fluid is more than 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80% or 90% and / or the fraction of the branched off fluid is less than 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80% or 90%. In this way, an optimized for the particular purpose pumping device can be formed.

In addition, it may prove to be expedient if the outlet of the fluid branch line is fluidically connected to the fluid input line. With the proposed construction, it is possible that the branched off Portion of the pumped fluid, for example, in the reservoir from which the fluid input line removes the fluid is returned. In this way, no fluid is "lost", so that a particularly economical pumping device can be realized. In addition, in the pumping device is not necessarily a fluid leakage into unwanted areas inside.

A particularly useful further education possibility arises when the fluid input line is connected to a Flüssigkeitszerstäuberdüse. In this way, a particularly cost-effective, universally applicable liquid atomizer can be realized.

Furthermore, a liquid atomizer, in particular a liquid atomizer for a scenting device is proposed which has at least one pumping device with the structure described above. In this way, a cost-effective and universally applicable liquid atomizer can be realized. In particular, the liquid atomizer can also carry out particularly small amounts of liquid. This is particularly interesting in the field of scenting devices, since it is desirable here for reasons of space to be able to use particularly highly concentrated scent. However, so that it does not come to an excessively strong scenting, the discharged amounts of fragrance must be chosen correspondingly small.

In addition, a scenting device is proposed, which has at least one pump device with the structure described above and / or at least one liquid atomizer with the structure described above. The scenting device then has the advantages and properties already described in connection with the pump device or the liquid atomizer in an analogous manner. In the Scenting device may in particular be a scenting device for a vehicle, preferably for a motor vehicle, preferably for a power-driven land vehicle. The land vehicle may be any rail-bound and / or non-slung vehicle in any manner. Of course, an application in an aircraft, a watercraft and / or in a building is conceivable.

A useful embodiment results when the scenting device has at least one actuator device for actuating at least one pump device and / or at least one liquid atomizer. In this way, the scenting can be done automatically. In particular, it is possible to release the fragrances intermittently in order to prevent habituation effects on the released fragrance. In this way, it is possible for the vehicle occupants to perceive the scenting over a substantially unlimited period of time.

Finally, a method for operating a pumping device is proposed in which a portion of the pumped fluid and / or the still to be pumped fluid is diverted and in particular is returned to the suction of the pumping device. The method can be further developed in the sense of the further training possibilities already described. The proposed method has the properties and advantages already described in connection with the pump device, the liquid atomizer and the scenting device in an analogous manner.

Fig. 1:

Einen schematischen Querschnitt durch ein erstes Ausführungsbeispiel eines Pumpzerstäubers mit Bypassbohrung;

Fig. 2:

einen vergrößerten Detailausschnitt eines Teils des in Fig. 1 gezeigten Pumpzerstäubers;

Fig. 3:

einen schematischen Detailausschnitt eines zweiten Ausführungsbeispiels eines Pumpzerstäubers mit Bypassbohrung;

Fig. 4:

einen schematischen Detailausschnitt durch ein drittes Ausführungsbeispiels eines Pumpzerstäubers mit Bypassbohrung;

Fig. 5:

einen schematischen Detailausschnitt durch einen Pumpzerstäuber mit magnetisch kraftbeaufschlagtem Ventil.

In the following the invention will be explained in more detail by means of embodiments and with reference to the accompanying drawings. Show it:

Fig. 1:

A schematic cross section through a first embodiment of a pump sprayer with a bypass bore;

Fig. 2:

an enlarged detail of a part of the in Fig. 1 shown pump sprayer;

3:

a schematic detail of a second embodiment of a pump sprayer with a bypass hole;

4:

a schematic detail through a third embodiment of a pump sprayer with by-pass hole;

Fig. 5:

a schematic detail through a pump sprayer with magnetically kraftbeaufschlagtem valve.

In Fig. 1 is shown in a schematic cross-sectional view of a pump sprayer 1 according to a first embodiment. The pump sprayer 1 has an inlet channel 6, which is fluidically connected via an inlet valve 2 with a pumping chamber 3. Via an outlet valve 4, the pumping chamber 3 can deliver fluid in the direction of the outlet channel 7. The output channel 7 discharges the fluid in the direction of a spray nozzle 9. A part of the outlet channel 7 and the atomizing nozzle 9 are arranged in a spray head 8. The pump 5 of the pump sprayer 1 is actuated by depressing or releasing the spray head 8.

The input valve 2 is formed in the present embodiment illustrated with a valve ball 10 which rests in its Schließstellututig in a valve seat 11. The output valve 4 is formed in the presently illustrated embodiment with a sealing element 12 which is axially displaceably mounted in an outer cladding tube 13 and with a sealing plate 14 works together. The lower edge of the sealing element 12 forms, together with the sealing plate 14, the outlet valve 4. The sealing plate 14 is arranged integrally on a pin 15 which is movably arranged with play in the lower region of the outlet channel 7. The play between pin 15 and outlet channel 7 is so large that fluid can pass through the gap between channel wall 16 and pin 15. In the in Fig. 1 shown position of the pump sprayer 1, the exhaust valve 4 is closed because the sealing member 12 is pressed by a first coil spring 17 in the direction of the sealing plate 14. In an analogous manner, the sealing plate 14 is pressed by a second spiral spring 18 in the direction of the sealing element 12. Seal member 12 and sealing plate 14 are thus printed together fluid-tight.

If the pump sprayer 1 is actuated by the spray head 8 is pressed down, so the volume of the pumping chamber 3 of the pump 5 decreases, and the fluid contained in the pumping chamber 3 is pressurized. At the same time, the valve ball 10 is pressed into its valve seat 11, so that the input valve 2 is closed in a fluid-tight manner.

After a certain actuation path of the spray head 8, the lower region of the sealing element 12 touches a stop web 19, which is formed in the outer cladding tube 13. If the spray head 3 is pressed further down, the sealing element 12 is lifted off from the sealing plate 14 with the aid of the stop web 19. The outlet valve 4 opens, and a certain amount of fluid is released into the outlet channel 7.

A first part of the quantity of fluid released into the outlet channel 7 exits the spray head 8 via the atomizing nozzle 9 in the form of a fluid mist.

However, a two part of the pumped by the pump 5 amount of fluid is fed back into the storage area for the fluid to be pumped. Accordingly, this second fluid portion is not output from the spray head 8 in the form of a fluid mist. Accordingly, this proportion reduces the amount of fluid released per actuation of the spray head 8. The pumping power of the pump 5 can be reduced in a simple manner.

The return of the second part of the pumped by the pump 5 amount of fluid via a bypass opening 20, an annular space 22 and an outlet opening 21. The bypass opening 20 is provided in the channel wall 16 of the outlet channel 7. The annular space 22 is formed by the channel wall 16 and the outer cladding tube 13. The annular space 22 "drains" the amount of fluid supplied via the bypass opening 20 via the outlet opening 21. The outlet opening 21 returns the portion of the fluid pumped by the pump 5 back into the fluid reservoir 23, from which the pump 5 via its input channel 6 to refers to pumping fluid. The arrangement of bypass opening 20, annular space 22 and outlet opening 21 is in Fig. 2 shown in enlarged view. To clarify the arrangement, the first coil spring 17 is not shown for reasons of clarity,

In dargesteliten embodiment, the output of the pump (5) is 50 microliters. This corresponds to a customary for pump sprayer 1 liquid output. The amount of the amount of liquid discharged via the spray head 8 is reduced to 5-8 microliters through the two openings 20, 21 (bypass opening 20, outlet opening 21). For this purpose, the bypass opening 20 and the outlet opening 21 have a diameter of approximately 0.3 mm in each case.

Then, the spray head 8 is released again, the spray head 8 is brought by means of the coil springs 17, 18 back up to the starting position. During its return movement, the volume of the pumping chamber 3 of the pump 5 increases. The increase in volume of the pumping chamber 3 causes a negative pressure to be created in the pumping chamber 3. As a result, the valve ball 10 is lifted off the valve seat 11. The input valve 2 opens. This in turn has the consequence that fluid is sucked into the pumping chamber 3 of the pump 5 via the inlet channel 6.

In Fig. 3 is a modification of the in Fig. 1 and 2 shown Pumpzerstäubers 1 shown. In the presently illustrated pump sprayer 24, the outlet opening 21 is arranged in the axial direction of the pump sprayer 24 further down. The outlet opening 21 is thereby located in a region in which it is covered by a region of the sealing element 12 in the resting state (unactuated state) of the pump sprayer 24. This makes it possible to provide a fluid-tight, liquid-tight and / or gas-tight closure of the fluid container 23 To achieve the outside world when the pump sprayer 24 is not operated. This is particularly welcome from a hygienic point of view. In addition, no fluid can escape from the fluid container 23 when, for example, the pump sprayer 24 is inclined (tilted).

In Fig. 4 a further embodiment of a pump sprayer 25 is shown, which again compared to the in Fig. 1 and 2 illustrated embodiment 1 or, compared to in Fig. 3 illustrated embodiment 24 is modified. In the presently illustrated embodiment of the pump sprayer 25, only a single outlet opening 26 is provided for the fluid pumped or pumped by the pump 5. The outlet opening 26 is provided in a region of the outer cladding tube 13 which defines the pumping chamber 3 of the pump 5. In addition, in the field of Outlet opening 26 on the outside of the outer casing 13, a piece of hose 27 attached, the hose piece 27 is made of an elastic material. If the volume of the pumping chamber 3 of the pump 5 is reduced and thereby the fluid in the pumping chamber 3 is pressurized, the fluid pressure causes the hose piece 27 to lift off the outer jacket 13 slightly. As a result, fluid can escape from the pumping chamber 3 and into the chamber Fluid reservoir 23 flow back, where it is available for further pumping operations. Of course, parallel to the passage of fluid through the outlet opening 26, as before, a fluid outlet into the outlet channel 7 occurs, which transports the fluid to the atomizing nozzle 9, where it emerges as a fluid mist. The effluent via the outlet opening 26 fluid content reduces the exiting via the spray head 8 fluid quantity. As a result, the pump 5 can "effectively" pump a significantly smaller amount of fluid than is the case with conventional pump atomizers.

When the spray head 8 is released again after the pumping operation has ended, the volume of the pumping chamber 3 of the pump 5 increases. Now, fluid enters the pumping chamber 3 via the inlet valve 4. During this return phase, the piece of tubing 27 lies sealingly on the outlet opening 26. As a result, no liquid or gas can flow into the pumping chamber 3 via the outlet opening 26. It should be noted that at relatively low liquid levels in the fluid container 23 (in FIG Fig. 4 not shown) otherwise gas (eg air) would sucked into the pumping chamber 3 angel, which would have the consequence that the pump sprayer 25 only to a very limited extent - if any - would be functional.

At the in Fig. 4 shown pump atomizer 25, the proportion of the output via the outlet opening 26 amount of fluid not only by the dimensioning of the outlet opening (diameter, length, number), but also be determined by the material properties of the tube piece 27. The more elastic the tube piece 27 is designed, the greater the proportion of the amount of fluid which escapes via the outlet opening 26. The size of the tube piece 27 (and thus the length of the fluid channel in the region of the tube piece 27) also has an influence on the proportion of the fluid escaping via the dispensing opening 26.

In Fig. 5 a further modification of a pump sprayer is shown. In the Fig. 5 In addition or as an alternative to providing a bypass opening 20, an outlet opening 21 or an outlet opening 26, the modification shown can be reacted.

When in Fig. 5 illustrated embodiment of a pump sprayer 30, the inlet valve 4 is formed as a magnetically kraftbeaufschlagtes valve. The inlet valve 4 comprises a valve ball 10, which cooperates with a corresponding valve seat 11. The ball is in the present embodiment 10 made of a ferromagnetic material, such as iron, nickel or an iron alloy, in particular made of steel.

Adjacent to the valve ball 10 of the exhaust valve 4, a ring magnet 28 is provided. The ring magnet 28 is placed outside in the region of the inlet channel 6 on the outer casing 13 and fixed there, for example by means of an adhesive. The ring magnet 28 is designed as a permanent magnet (it is quite conceivable to provide an electrical coil). The magnetic field lines generated by the ring magnet 28 cause that the valve ball 10 made of a ferromagnetic workpiece is pulled into the valve seat 11. As a result, the valve ball 11 at a tilting of the pump sprayer 30 no longer, or only made difficult roll out its valve seat 11. The pump sprayer 30 can thereby be used substantially independent of location.

In order for the liquid to be atomized by the pump atomizer 30 to be sucked into the pumping chamber 3 of the pump 5 of the liquid atomizer 30 even when the pump sprayer 30 (which has, for example, a molded-on liquid container 23), a riser 29 is inserted into the inlet channel 6. The riser 29 may be formed, for example, as a flexible hose, at the lower end of a weight is arranged, the suction of the riser 29 then follows gravity due to the liquid, so that the liquid can be removed in a variety of position of the pump sprayer 30 from the liquid container 23 ,

Claims (14)

Pump device (5) for Flüssiggätsserstäubervorrichtungen (1, 24, 25, 30), comprising at least one fluid input line (6), at least one pumping chamber (3) and at least one Fiuidausgangsleitung (7), wherein between at least one fluid input line (6) and at least one Pump chamber (3) at least one input valve (2) and between at least one pumping chamber (3) and at least one fluid outlet line (7) at least one outlet valve (4) is arranged, characterized by at least one fluid branch line (20, 21, 26). Pumping device (5) according to the preamble of claim 1, in particular according to claim 1, characterized in that at least one valve (2, 4, 27, 28), in particular an input valve (2) and / or an output valve (4), as selbstverschlleßendes Valve (2, 4, 27, 28, Fig. 5) is executed, in particular kraftbeaufschlagt (17, 18, 27, 28) is executed. Pumping device (5) according to claim 1 or 2, characterized in that at least one self-closing valve (2, 4, 27, 28) is spring-loaded (17, 18) and / or magnetic (28), in particular by means of a permanent magnet (28). is carried out magnetically. Pumping device (5) according to one of claims 1 to 3, characterized in that at least one fluid branch line (20, 21, 26) is in fluid communication with at least one fluid outlet line (7) and / or at least one pumping chamber (3). Pumping device (5) according to one of claims 1 to 4, characterized in that at least one fluid branch line (20, 21, 26) is provided with at least one branch valve (27). Pumping device (5) according to one of claims 1 to 5, in particular according to claim 4, characterized in that at least one valve (2, 4, 27, 28), in particular at least at least one branch valve (27) is formed as a material deformation valve (27), in which a fluid opening (26) is released by a material deformation of an elastic material (27). Pumping device (5) according to one of claims 1 to 6, characterized in that at least one fluid branch line (20, 21, 26) is formed in multiple stages. Pumping device (5) according to one of claims 1 to 7, characterized in that via the fluid branch line (20, 21, 26) a defined proportion of pumped and / or still to be pumped fluid is diverted, in particular more than 10%, 20% , 30%, 40%, 50%, 60%, 70%, 80%, 90% and / or less than 10%, 20%, 30%, 40%, 60%, 60%, 70%, 80%, 90%. Pumping device (5) according to one of claims 1 to 8, characterized in that the output of the fluid branch line (20, 21, 26) is fluidically connected to the fluid input line (6). Pumping device (5) according to one of claims 1 to 9, characterized in that the fluid outlet line (7) is connected to a liquid atomizing nozzle (9). Liquid atomiser (1, 24, 25, 30), in particular liquid atomiser (1, 24, 25, 30) for a scenting device which has at least one pumping device (5) according to one of claims 1 to 10. Scenting device, in particular scenting device for a vehicle, in particular for a motor vehicle, preferably for a power-driven land vehicle, comprising at least one pumping device (5) according to one of claims 1 to 10 and / or at least one Flüssigkeitszetstäuber (20, 21, 26) according to claim 11. Scenting device according to claim 12, characterized by at least one actuator device for actuating at least one pump device (5) and / or at least one liquid atomizer (1, 24, 25, 30). Method for operating a pump device (5), in particular a pump device (5) according to one of claims 1 to 10, characterized in that a portion of the pumped fluid and / or the still to be pumped fluid is diverted and in particular in the intake (6) the pump device (5) is returned.

Images