WO2013037580A1

WO2013037580A1 - Pump device for delivering a fluid through a fluid line in a controllable manner

Info

Publication number: WO2013037580A1
Application number: PCT/EP2012/065746
Authority: WO
Inventors: Rafael FREJNO
Original assignee: Makita Corporation
Priority date: 2011-09-15
Filing date: 2012-08-10
Publication date: 2013-03-21
Also published as: DE202011051306U1

Abstract

The invention relates to a pump device (100) for delivering a fluid (2) through a fluid line (3) from a fluid source (4) to a device (1) in a controllable manner, wherein a membrane unit (5) with a membrane (6) is provided, said membrane being fluidically connected to the fluid line (3) in an operative manner, and the membrane (6) can be vibrated such that the fluid flow through the fluid line (3) can be influenced by the vibration in the membrane (6). The aim of the invention is to provide such a pump device which is designed with simple means for regulating the metered quantity of the fluid delivered to the device. This is achieved in that a damping module (8) is provided and is operatively connected to the membrane (6), the vibration in the membrane (6) being dampable using said damping module.

Description

Pump device for the controllable delivery of a fluid through a fluid line

description

The present invention relates to a pumping device for controllably delivering a fluid through a fluid conduit from a fluid source to a fluid receiving or fluid consuming device, wherein a diaphragm assembly having a diaphragm is provided in fluid communication with the fluid conduit, and wherein the diaphragm is vibratable is such that the fluid flow through the fluid line can be influenced by the vibration in the membrane.

State of the art

From DE 20 2009 007 558 Ul, for example, a pump device is known, which is designed as a carburetor unit for providing a fuel-air mixture to an internal combustion engine. The carburetor unit has a device forming air vent for sucking fuel from an opening into the air duct fuel line, so that the fluid is formed by the fuel and the fluid line through the fuel line. The fuel line removes fuel from a fuel control chamber, which is the source of fluid, and in the fuel line is disposed a membrane unit having a diaphragm in fluid communication with the fluid line.

The membrane unit serves as a pump unit, and the membrane is vibrated by an actuator. The actuator has a magnet and a coil, and by energizing the coil, a relative movement between the coil and the magnet can be generated. The magnet is connected to the diaphragm so that the vibration generated by the actuator can be transferred to the diaphragm.

In operative connection with two Tesla diodes, which are introduced into the fuel line, a pumping device is formed, and it is stated that the pumping direction of the Tesla diodes in operative connection with the membrane unit acts against the fuel flow from the fuel control chamber into the air funnel. The fuel flow from the fuel control chamber into the venturi is usually generated by a negative pressure in the venturi, and the venturi has a restriction, so that a venturi effect creates a vacuum in the region of the mouth of the fuel duct into the venturi. By this negative pressure, the fuel from the fuel control chamber is sucked through the fuel line. If the actuator is now activated, and the membrane is vibrated, the membrane acts in conjunction with the Tesla diodes as a pumping unit, which throttles the fuel flow in the fuel line from the fuel control chamber into the air funnel. The stronger the actuator is activated, the lower the result is the flow of fuel from the fuel control chamber into the venturi.

Disadvantageously, the membrane unit is designed as an active membrane unit, so that it represents an electrical consumer. Consequently, in addition to the electronic control of the coil of the actuating element, a power supply of the actuating element is necessary. Thus, a power supply of the actuator must be provided, which requires additional technical effort to form the carburetor unit.

Other pumping devices for the controllable delivery of fluids through a fluid line from a fluid source to a device, such as for consumption of the fluid, may be used, for example, to convey oil to a lubrication point or to convey water to a cooling point of a tool and the like. In particular, manually operated engine working devices with an internal combustion engine for driving a tool have in addition to the fuel metering to a carburettor unit of the internal combustion engine, a plurality of fluid systems, which are also designed with metering devices to regulate the amount of fluid, for example, depending on other operating parameters of the engine tool. For this purpose, it is desirable to form a pump device for conveying a fluid, which does not require an external electrical power supply, but can be controlled in a simple manner.

DESCRIPTION OF THE INVENTION: Problem, Solution, Advantages

It is therefore the object of the present invention, a pumping device for conveying a fluid through a fluid conduit from a fluid source to provide a device which is designed with simple means for controlling the metered amount of fluid to the device. In particular, it is the object of the present invention to provide such a pump device, which is based essentially on passively acting components and can be operated freely by an external electrical power supply.

This object is achieved on the basis of a pump device for conveying a fluid through a fluid line from a fluid source to a device according to the preamble of claim 1 in conjunction with the characterizing features. Advantageous developments of the invention are specified in the dependent claims.

The invention includes the technical teaching that a damping module is provided and operatively connected to the membrane, with which the vibration in the membrane is damped.

The invention is based on the idea that the vibration in the membrane is exaggerated. For example, due to the design of internal combustion engines, a pulsating pressure curve can be available at least in the charge air tract or in the internal combustion engine itself. If this fluid, which oscillates with a pulsating pressure curve, is brought into fluid communication with the membrane, the membrane can also be set in vibration in order to achieve the required pumping action in the fluid line.

The pump device for controllably conveying a fluid through a fluid line from a fluid source to a device can already create a maximum flow of fluid with the externally excited oscillation of the diaphragm, which is sufficient for the respective application, for example for maximum fuel metering to a carburettor unit , maximum delivery of oil to a lubrication point or maximum delivery of water to a refrigeration point. Based on this, the invention makes use of the idea to provide a passive damping module and to connect it to the membrane, with which the vibration in the membrane can be damped, so that starting from a maximum oscillation amplitude of the membrane, the oscillation with the damping module can be reduced to small oscillation amplitudes to control the fluid flow through the fluid line. Consequently, the damping module can act passively, and provision of electrical energy is not required. The passive damping module can be designed so that it can attenuate the vibration in the membrane without requiring an electrical energy source.

Advantageously, the damping module is designed as a passively acting electrical damping module and in particular has a magnetic coil unit with a coil and a magnet, wherein the magnetic coil unit with the membrane cooperates such that the vibration in the membrane generates a relative movement between the coil and the magnet. The generated relative movement between the magnet and the coil of the magnetic coil unit is even provided with this electrical energy. Similar to the construction of a loudspeaker with a diaphragm and a magnetic coil and a magnet, the diaphragm can be vibrated, and the relative movement between the coil and the magnet induces a voltage in the coil, which in turn damps the vibration in the diaphragm.

The damping module can also be formed by a piezoelectric element, which is connected in a corresponding manner with the membrane of the membrane unit according to further embodiments. Furthermore, a mechanical spring or for example a rubber buffer or a hydraulic arrangement can be used, for example a visco-coupling, which can act on the membrane of the diaphragm vibration damping or can cooperate with this vibration damping in some other way and is adjustable in their damping effect.

If the damping module is formed with a magnet coil unit with a coil and with a magnet, the damping module can furthermore have an electrical means which is connected to the coil and forms an electrical load, by means of which the oscillation in the membrane can be changed the electrical means may be, for example, a variable ohmic resistance. If the resistance that is connected to the coil is reduced, the current flow through the resistance of the induced voltage in the coil counteracts the Lorentz effect. Is the ohmic wi Resistance adjustable, so the current flow through the resistor can be changed accordingly. As a result, the electromagnetic force between the coil and the magnet changes, and thus the vibration in the diaphragm can be changed over.

According to an advantageous embodiment of the present invention, the membrane can be set in vibration by an excitation fluid with a pulsating pressure curve, for example by a connection to the pulsating pressure curve in the charge air tract or in the crankcase of an internal combustion engine. It is known that the pressure curve in the crankcase of the internal combustion engine is variable with the rotational speed of the crankshaft of the internal combustion engine, and in each internal combustion engine, which is designed in particular as a two-stroke internal combustion engine, a pressure-pulsating excitation fluid is already available. The pump device according to the invention can consequently use the pulsating pressure curve in the crankcase chamber in order to set the membrane of the membrane unit into a fundamental oscillation.

According to a further advantageous embodiment, at least one Tesla diode can be arranged in the fluid line between the device and the fluid source, which fluidically forms a controllable throttle unit with the membrane unit in operative connection with the Tesla diode, and which is a flow of the fluid from the Counteracts fluid source to the device. The membrane unit may preferably be arranged between two Tesla diodes or preferably connected to the fluid line between the Tesla diodes. Depending on the direction of flow of the Tesla diodes, a pumping action from the fluid source to the device can be created with the swinging diaphragm or, for example in a carburettor, the negative pressure in a venturi of the carburettor forming the device can already supply the fluid from the fluid source are sucked into the air funnel, and by the vibrating membrane, the fluid flow is inhibited. The stronger the throttling effect of the damping module, the greater the fluid flow, for example formed by fuel.

With particular advantage, therefore, the pump device for a carburetor unit for providing a fuel-air mixture to a combustion engine, so that the fluid through fuel and the fluid line are formed by a fuel line through which fuel flows from a fluid source formed by a fuel control chamber to a vent formed by the device. Only through the advantageous arrangement of two Tesla diodes can be created with the diaphragm unit, a pumping device, which counteracts the fuel flow due to the suction effect from the venturi.

Tesla diodes have a higher flow resistance in a reverse direction, and in a forward direction, the Tesla diodes have lower flow resistance. The ratio of the pressure loss in both directions is expressed with the so-called diodicity, which is a dimensionless number. Because of this asymmetric property, such a component is also referred to as a fluidic diode analogous to the diodes in electrical engineering. Due to the vibration of the membrane, the fuel flow from the tank into the air funnel is counteracted. Much vibration thus causes a low flow of fuel. The passively acting electrical damping module thus reduces the fuel flow. Without its function, ie without damping the vibration in the membrane, the fuel flow is consequently the lowest.

The Tesla diodes are inserted with their reverse direction in the fuel line so that the flow of fuel from the fuel control chamber is obstructed in the air funnel. It should be noted that even in the reverse direction a residual flow rate of fuel can get into the air funnel, so that it is ensured that the internal combustion engine is basically supplied with a minimum amount of fuel.

The fundamental vibration of the membrane may be such that no or only a very small amount of fuel passes from the fuel control chamber into the venturi. Only by damping the oscillation in the membrane by means of the passively acting electrical damping module according to the invention can fuel flow from the fuel control chamber into the air funnel take place. If the membrane vibration has no function, then the fuel-air mixture is enriched so that the engine can not be damaged. With further advantage, a fuel nozzle may be arranged in the fuel line, preferably adjacent to the fuel control chamber. As with conventional carburettor units, the amount of fuel supplied to the venturi can be adjusted at the fuel nozzle in the fuel line. Preferably, the fuel nozzle is designed to be adjustable and can be adjusted so that in case of failure of the membrane unit, the mixture is heavily greased, so that damage to the internal combustion engine can be avoided. In the fuel line, preferably the fuel control chamber, the fuel nozzle, the Tesla diodes and finally the mouth of the fuel line can be arranged in the air funnel in series.

The membrane of the membrane unit can be connected by a connecting means, for example a tie rod, with the coil of the solenoid unit, so that the coil relative to the magnet performs the same vibration as the membrane. The magnet may be arranged stationary and the coil, which may have a smaller mass than the magnet, forms the dynamically moving component for generating the relative movement between the coil and the magnet. If a voltage is induced in the coil by the relative movement to the magnet, this can be tapped off via an electrical conductor which, as a connection to the electrically acting means, for example to an ohmic resistance, is at least partially moved with the coil or a current collector is arranged.

Further, the relative movement between the coil and the magnet may be created by connecting the diaphragm to the magnet by a connection means such that the magnet makes the same vibration relative to the coil as the diaphragm. The coil can form the stationary part of the magnetic coil unit, wherein the magnet is moved dynamically with the membrane. However, there is the disadvantage that the mass of the magnet must be vibrated, which may be greater than the mass of the coil.

The membrane can movably limit a fluid space, and the

Fluid space can be connected in particular with a connecting line to the fluid line by means of a connecting element. The fluid space is not basically flowed through with fuel, but the fluid space with the same fluid filled and fluidly connected with it as the fluid flowing through the fluid conduit. For example, the fluid space may be formed by a fuel raum, and the fluid forms the fuel. The fuel in the fuel gap thus forms a fuel column, which is correspondingly connected via a connecting element, which may have a certain volume, with the fuel line between the two Tesla diodes. The vibration of the fuel column in the connecting line forms a pulsation in the fuel line, through which the Tesla diodes unfold their respective blocking effect and Durchlasswirkung. If the Tesla diodes are arranged in the fuel line in such a way that the blocking direction forms the fuel flow direction to the air funnel, then with a stronger pulsation of the fuel in the connecting line and consequently in the connecting element, the fuel flow towards the air funnel is further prevented. Decreases the pressure pulsation, for example, by the load on the solenoid unit is increased by the electrical means, the fuel flow towards the venturi in the fuel line can increase again.

As an alternative to a fuel chamber, which is connected via a connecting line with the fuel line, the fuel chamber can also be integrated in the fuel rail ge, and from the fuel cavities can be branched off a fuel channel, which opens into the air funnel. Consequently, in the same way, the amount of fuel entering the air vent can be changed by the vibration of the membrane, which spatially limits the fuel.

According to a further advantageous embodiment of the inventive carburetor unit, the internal combustion engine may have a control unit, and the electrically acting means of the carburettor unit may be part of the control unit or the electrically acting means may be electrically controllable at least by the control unit. The damping module can generate electrical energy during movement of the membrane of the membrane unit, which can be tapped controllably by the damping module. Furthermore, the damping module can provide an electrical voltage that is proportional to the damping amount of the damping module. The electrical voltage can, for example, form an electrical variable which can be used as a large is usable for operating an internal combustion engine. For example, this electrical variable can be read out by the control unit, and the electrical variable can form a reference variable with which it is possible to deduce the actual amount of fuel that is fed to the air funnel or the electrical variable forms another variable with which an average value can be determined. flow of oil or water or other fluid that is controlled by the pumping device.

The energy generated by the electrically acting means can be made available to other consumers according to another vorteihalften embodiment. Thus, it is conceivable that the pumping device drives a first electrical means, e.g. B. a piezoelectric element, which then drives another electrical means, for. B. another piezoelectric element for driving the Tesla carburetor. In this case, the use of the electrical voltage as a reference variable for the operation of an internal combustion engine remain unaffected by the tap of the electrical energy for supplying at least one further electrical load.

Brief description of the drawings

Further, measures improving the invention will be described in more detail below together with the description of preferred embodiments of the invention with reference to FIGS. It shows:

1 shows a general embodiment of a pumping device according to the present invention,

Fig. 2 is a schematic view of a special pumping device, which is designed as a carburetor unit for providing a fuel-air mixture to an internal combustion engine and

Fig. 3 shows another embodiment of a carburetor unit according to the present invention.

Preferred embodiment of the invention

FIG. 1 shows a pump device 100 for conveying a fluid 2 through a fluid line 3 to a device 1 having the features of the present invention. The device 1 may constitute a consumer of the fluid 2, and the fluid 2 may be constituted, for example, by fuel, by oil or water or the like. The fluid line 3 extends between a fluid source 4 and the device 1, and two Tesla diodes 14 and 15 are arranged in the fluid line 3, the Tesla diodes 14 and 15 throttling the fluid flow in the direction of the device 1 by the Tesla Diodes 14 and 15 are integrated in the reverse direction in the fluid line 3. Between the Tesla diodes 14 and 15 is a connecting element 21, in which a connecting line 20 is fluidically connected to the fluid line 3. Connected to the connecting line 20 is a membrane unit 5, which will be described in more detail below.

The membrane unit 5 has a fluid space 19, which is filled with the same fluid 2, which also flows through the fluid line 3, and which is fluidically connected to the fuel line 3 via the connecting line 20 and the connecting element 21. The fluid space 19 is movably bounded by a diaphragm 6, and an excitation fluid 7 is located on the side of the diaphragm 6 opposite the fluid space 19. The excitation fluid 7 is connected, for example, to the crankcase chamber 13 of an internal combustion engine, and by a pulsating pressure in the engine Crankcase chamber 13, the excitation fluid 7 adjacent to the membrane 6 also has a pressure pulsation. As a result, the diaphragm 6 is set in a fundamental mode.

To the membrane unit 5, a damping module 8 is arranged and mechanically connected thereto, wherein the damping module 8 is shown only schematically. The damping module 8 is designed to be adjustable, and the damping of the damping module 8 and thus the damping of the diaphragm 6 can be changed.

By changing the damping of the diaphragm 6, the "stiffness" of the movement of the diaphragm 6 can be changed. As a result, the pressure pulsation in the connecting passage 20 can be changed, which is transferable to the fluid 2 in the fluid passage 3 through the connecting member 21. A strong pulsation of the fluid column in the connecting line 20 causes a strong blocking effect of the Tesla diodes 14 and 15, and a lower pressure pulsation in the connecting line 20 leads to a stronger flow of the fluid 2 through the fluid line third

FIG. 2 shows a pump device 100, which serves as a carburetor unit 100 for providing a fuel-air mixture to an internal combustion engine is formed so that the fluid 2 is formed by fuel 2. The carburetor unit 100 has an air funnel 1, which forms the device 1 and is sucked in by the charge air for operation of the internal combustion engine. The air flow 26 of the charge air is indicated by an arrow, and the air funnel 1 has a constriction 28, as a result of which a negative pressure is created based on the Venturi effect. By means of this negative pressure in the region of the constriction 28 of the air funnel 1, fuel 2 is sucked out of the mouth 27 of the fluid line 3. The fuel 2 is entrained with the air flow 26, and the thus formed fuel-air mixture is supplied to the internal combustion engine.

The fluid line 3 forms a fuel line 3 and extends between a fluid source 4 forming the fuel control chamber 4 and the mouth 27, and in the fuel line 3, a fuel nozzle 16 is disposed adjacent to the fuel control chamber 4, and the fuel nozzle 16 is made adjustable to to regulate the flow rate of the fuel 2 through the fuel line 3. Between the fuel nozzle 16 and the mouth 27, two Tesla diodes 14 and 15 are arranged, wherein the Tesla diodes 14 and 15 throttle the flow of fuel towards the mouth 27 by the Tesla diodes 14 and 15 in the reverse direction in the fuel line third are integrated. Between the Tesla diodes 14 and 15 is the connecting element 21 in that the connecting line 20 is fluidically connected to the fuel line 3. To the connecting line 20, the membrane unit 5 connects.

To the membrane unit 5, a passively acting electrical damping module 8 is arranged, which forms a magnetic coil unit 8. The magnet coil unit 8 has a coil 9 and a magnet 10, wherein the coil 9 is mechanically connected to the membrane 6 via a connecting means 17. Consequently, the coil 9 performs the same vibration as the diaphragm 6, as indicated by a double arrow. By the lifting movement of the coil 9 relative to the magnet 10, a voltage is induced in the coil 9, which is connected to an electrically acting means 11. The electrically acting means 11 is designed as a passive means and has, for example, an ohmic resistance 12, which is designed as a controllable resistor.

By changing the ohmic resistance of the resistor 12, the current flow through the resistor 12 can be changed, and a lesser Resistance value of the resistor 12 leads to a braking force in the movement of the coil 9 relative to the magnet 10. Thus, the "stiffness" of the movement of the coil 9 is changed relative to the magnet 10, whereby the oscillation amplitude of the coil 9 and consequently the diaphragm 6 can be changed As a result, the pressure pulsation in the connection line 20 can be changed, which is transferable to the fuel 2 in the fuel line 3 through the connection element 21. A strong pulsation of the fuel column in the connection line 20 causes a strong blocking effect of the Tesla diodes 14 and 15, and a lower pressure pulsation in the connection line 20 leads to a stronger flow of the fuel 2 through the fuel line 3.

The advantage of the arrangement according to the invention lies in a simple change of the ohmic resistance 12 in order to be able to change the quantity of the fuel 2 which is allocated to the orifice 27 and consequently to the venturi 1. For the operation of the electrically acting means 11, no external energy supply is necessary, since the basic energy supply is already generated by the pressure pulsation in the excitation fluid 7 with the crankcase chamber 13.

FIG. 3 shows a further exemplary embodiment of the carburettor unit 100 with an air funnel 1, in which a throttle valve 25 is also shown. Adjacent to the venturi 1, a fuel cavity 22 is shown, which is filled with fuel 2. The fuel chamber 22 is again movably bounded by a membrane 6, and the membrane 6 is connected via a connecting means 18 with the magnet 11 of the solenoid unit 8. Thus, the magnet 10 is moved dynamically with the diaphragm 6, wherein the coil 9 according to this exemplary embodiment is designed as a stationary component of the magnet coil unit 8. The excitation of the membrane oscillation of the membrane 6 is again effected by the excitation fluid 7, which is in fluid communication with the crankcase chamber 13 of the internal combustion engine.

The electrically acting means 11 with the ohmic resistor 12 is shown by way of example as part of a control unit 23 which serves to operate the internal combustion engine. Due to the power generation of the electrically acting means 11 in conjunction with the magnetic coil unit 8, this can without external power supply a reference variable for the control unit 23rd provide to obtain a size about the amount of fuel 2, which is supplied to the air vent 1. For this purpose, a fuel ka na I 24, which extends between the fuel 22 and the venturi space 1. Depending on the oscillation amplitude of the membrane 6, which is adjustable by the resistance value of the ohmic resistance 12, the required amount of fuel 2 can be allocated to the air stream 26 in the air funnel 1, the ohmic resistance 1 also being controlled electronically by the coil 9 can be substituted from the control unit 23.

The invention is not limited in its execution to the above-mentioned preferred embodiment. Rather, a number of variants is conceivable, which makes use of the illustrated solution even with fundamentally different types of use. All of the claims, the description or the drawings resulting features and / or advantages, including constructive details or spatial arrangements, can be essential to the invention both in itself and in various combinations. In particular, the principle of the moving magnet 10 according to FIG. 2 can also be used for a carburettor unit 100, as shown in FIG. Furthermore, the embodiment of the magnetic coil unit 8 according to FIG. 1 with a moving coil 9 can be used for a carburetor unit 100 according to FIG. 2. Furthermore, the control unit 23 shown in FIG. 2 can also be used for the exemplary embodiment in FIG. The invention uses a membrane function with attenuator for a so-called Teslavergaser described above. It is further conceivable to use this membrane function with attenuator for other purposes, such as for the targeted introduction and consequently the targeted reduction of engine lubricating oil, similar to a separate lubrication, as known from moped engines with petrol and two-stroke engine oil tank, or as a controllable oil pump Chain lubrication, possibly in combination with Tesla valves or as adjustable water supply unit for cut-off grinder water sets. LIST OF REFERENCE NUMBERS

100 pumping device, carburettor unit

I device, air funnel

2 fluid, fuel

3 fluid line, fuel line

4 fluid source, fuel control chamber

5 membrane unit

6 membrane

7 excitation fluid

8 damping module, solenoid unit

9 coil

10 magnet

II electrically acting agent

12 ohmic resistance

13 crankcase chamber

14 Tesla diode

15 Tesla diode

16 fuel nozzle

17 connecting means

18 connecting means

19 fluid space, fuel room

20 connection line

21 connecting element

22 fuel room

23 control unit

24 fuel channel

25 throttle

26 airflow

27 estuary

28 constriction

Claims

claims

A pumping device (100) for controllably delivering a fluid (2) through a fluid conduit (3) from a fluid source (4) to a device (1), wherein a membrane unit (5) is in fluid communication with a diaphragm (6) is provided with the fluid line (3), and wherein the membrane (6) is set into oscillation, so that the fluid flow through the fluid line (3) can be influenced by the oscillation in the membrane (6), characterized in that a damping module (8 ) and with the membrane (6) is operatively connected, with which the vibration in the membrane (6) is damped.

2. Pump device according to claim 1, characterized in that the damping module (8) is designed as a passively acting electrical damping module (8) and in particular a magnetic coil unit (8) with a coil (9) and with a magnet (10), wherein the Magnetic coil unit (8) with the membrane (6) cooperates such that the vibration in the membrane (6) generates a relative movement between the coil (9) and the magnet (10).

3. A pumping device according to claim 2, characterized in that the damping module (8) comprises an electrical means (11) which is connected to the coil (9) and forms an electrical load, wherein by a change in the electrical load, the oscillation in the Membrane (6) is variable, and wherein the electrical means (11) is in particular a variable resistance (12).

4. Pumping device according to claim 1, characterized in that the damping module (8) by a piezoelectric element and / or a mechanical spring and / or a rubber buffer and / or a hydraulic arrangement, in particular a viscous coupling is formed.

5. Pump device according to one of claims 1 to 3, characterized in that the membrane (6) by an excitation fluid (7) with a pulsating pressure curve is vibrated, wherein the fluid (7) with a pulsating pressure curve, in particular with a crankcase chamber (13) of an internal combustion engine is fluidly connected.

6. Pump device according to one of the preceding claims, characterized in that in the fluid line (3) between the device (1) and the fluid source (4) at least one Tesla diode (14, 15) is arranged which is fluidically connected to the membrane unit (5 ) cooperates.

7. A pumping device according to claim 6, characterized in that the membrane unit (5) in operative connection with the Tesla diode (14, 15) forms a controllable pump unit, the fluid (2) from the fluid source (4) to the device (1). promotes or that the membrane unit (5) in operative connection with the Tesla diode (14, 15) forms a controllable throttle unit, which counteracts a flow of the fluid (2) from the fluid source (4) to the device (1).

8. Pumping device according to one of the preceding claims, characterized in that the membrane (6) by a connecting means (17) with the coil (9) is connected, so that the coil (9) relative to the magnet (10) performs the same vibration as the membrane (6).

9. Pump device according to one of claims 1 to 8, characterized in that the membrane (6) by a connecting means (18) with the magnet (10) is connected, so that the magnet (10) relative to the coil (9) the same vibration performs like the membrane (6).

10. Pumping device according to one of the preceding claims, characterized in that the pumping device is designed for a carburetor unit for providing a fuel-air mixture to an internal combustion engine, so that the fluid (2) by fuel (2) and the fluid line (3) through a fuel line (3) through which fuel (2) flows from a fluid source (4) formed by a fuel control chamber (4) to a venturi (1) formed by the device (1).

11. Pumping device according to one of the preceding claims, characterized in that in the fuel line (3) preferably adjacent to the fuel control chamber (4) a fuel nozzle (16) is arranged.

12. Pump device according to one of the preceding claims, characterized in that the membrane (6) delimits a fluid space (19) movable, wherein the fluid space (19) in particular with a connecting line (20) with the fluid line (3) in a connecting element (21 ), wherein the connecting element (21) is preferably arranged between the Tesla diodes (14, 15).

13. The pump device according to claim 1, wherein the membrane (6) moveably delimits a fuel chamber (22), from which a fuel channel (24) branches off, which opens into the air funnel (1) ,

14. Pump device according to one of the preceding claims, characterized in that the internal combustion engine has a control unit (23), and wherein the electrically acting means (11) is part of the control unit (23) and / or wherein the electrically acting means (11) of the control unit (23) is electrically controllable.

15. Pump device according to one of the preceding claims, characterized in that the electrically acting means (11) electrical

Generates energy that can be provided for at least one other consumer, in particular that by the electrically acting means (11) an electrical variable is provided, which is used as a reference variable for operating the internal combustion engine.