Membrane pump
The invention relates to a diaphragm pump ( 109 ) having a pump housing ( 1 ) on which a disposable cell ( 2 ) is releasably fixable, which disposable cell has a first and a second cell wall ( 3, 4 ) which ( 3, 4 ) define an operating space ( 5 ) between them, and having an operating diaphragm ( 6 ) which ( 6 ) is drivingly connected to an oscillating stroke drive and which ( 6 ) is releasably coupleable with the flexible first cell wall ( 3 ) on its diaphragm flat side remote from the stroke drive. It is characteristic to the diaphragm pump ( 109 ) according to the invention that at least one outlet port ( 12 ) in the operating diaphragm ( 6 ) is provided with a return flow obstructer or a return flow preventer for evacuating the dead space ( 11 ) arranged between it and the first cell wall ( 3 ) (cf. FIG. 1 ).
1. A diaphragm pump ( 101 , 102 , 107 , 109 , 116 , 123 ) comprising:
a pump housing ( 1 ),
a disposable cell ( 2 ) that is releasably fixable to the pump housing, said disposable cell has a flexible first cell wall and a second cell wall ( 3 , 4 ) which define an operating space ( 5 ) therebetween,
an oscillating stroke drive,
an operating diaphragm ( 6 ) drivingly connected to the oscillating stroke drive, said operating diaphragm ( 6 ) is connected at an operating diaphragm edge region to the pump housing and releasably coupleable with the flexible first cell wall ( 3 ) on a diaphragm flat side remote from the stroke drive, and
at least one outlet port ( 12 ) is defined through the operating diaphragm ( 6 ) in an area radially inwardly from the operating diaphragm edge region providing a communication path into an interior of the pump housing on an opposite side of the operating diaphragm from the first flexible cell wall, and a return flow obstructer or a return flow preventer is connected to the operating diaphragm in the interior of the pump housing for evacuating a dead space ( 11 ) arranged between the operating diaphragm ( 6 ) and the flexible first cell wall ( 3 ).
2. The diaphragm pump as claimed in claim 1 , wherein the flexible first cell wall and the second cell wall ( 3 , 4 ) each include an edge region at which they are clamped to the pump housing to define the operating space ( 5 ).
3. The diaphragm pump as claimed in claim 1 , wherein the flexible first cell wall and the second cell wall ( 3 , 4 ) are connected together so as to be fluid-tight in an edge region which defines the operating space ( 5 ).
4. The diaphragm pump as claimed in claim 1 , wherein the flexible first cell wall ( 3 ) lies against the operating diaphragm ( 6 ) during a downward movement of the operating diaphragm ( 6 ) to a bottom dead center.
5. The diaphragm pump as claimed in claim 1 , wherein the flexible first cell wall ( 3 ) is releasably coupleable with the operating diaphragm ( 6 ) by negative pressure.
6. The diaphragm pump as claimed in claim 1 , wherein the flexible first cell wall ( 3 ) is releasably coupleable with the operating diaphragm ( 6 ) by adhesion.
7. The diaphragm pump as claimed in claim 1 , wherein the flexible first cell wall ( 3 ) is releasably coupleable with the operating diaphragm ( 6 ) by prestressing thereof via an elasticity of the flexible first cell wall ( 3 ) itself in a direction of the operating diaphragm ( 6 ).
8. The diaphragm pump as claimed in claim 1 , wherein the return flow obstructer provided in the at least one outlet port ( 12 ) is formed as a nozzle or as a narrowing of a cross section in the outlet port ( 12 ).
9. The diaphragm pump as claimed in claim 1 , wherein the return flow obstructer is provided in the at least one outlet port ( 12 ) and comprises a non-return valve which is movable from a closed position against a restoring force into an open position which opens in a direction opposite the dead space ( 11 ).
10. The diaphragm pump as claimed in claim 1 , wherein the return flow obstructer is provided in the at least one outlet port ( 12 ), and the return flow obstructer has a valve body which is movable between the open position and the closed position.
11. The diaphragm pump as claimed in claim 10 , wherein the valve body is connected integrally to an elastic material of the operating diaphragm ( 6 ).
12. The diaphragm pump as claimed in claim 1 , wherein the return flow preventer comprises a duckbill valve or a flutter valve.
13. The diaphragm pump as claimed in claim 10 , wherein the valve body remains in a closed position during a downward movement of the operating diaphragm ( 6 ) to a bottom dead center due to a mass inertia and is moved into an open position during a stroke movement toward to a top dead center.
14. The diaphragm pump as claimed in claim 10 , wherein a restoring force acting on the valve body is applied by at least one resiliently elastic or rubber-elastic restoring element or by an elasticity of the valve body itself.
15. The diaphragm pump as claimed in claim 14 , wherein the at least one restoring element ( 15 ) comprises a compression spring.
16. The diaphragm pump as claimed in claim 1 , wherein the stroke drive comprises an eccentric drive.
17. The diaphragm pump as claimed in claim 1 , wherein the stroke drive comprises a linear drive.
18. The diaphragm pump as claimed in claim 1 , wherein the stroke drive comprises an electric or hydraulic stroke drive.
19. The diaphragm pump as claimed in claim 1 , wherein a stroke movement of the stroke drive into a top dead center is effected by at least one lifting magnet and a downward movement of the operating diaphragm ( 6 ) into a bottom dead center is effected by a resiliently elastic or rubber-elastic restoring part.
20. The diaphragm pump as claimed in claim 1 , wherein a stroke movement of the stroke drive into a top dead center is effected by a resiliently elastic or rubber-elastic restoring part and a downward movement of the operating diaphragm ( 6 ) into a bottom dead center is effected by at least one lifting magnet.
21. The diaphragm pump as claimed in claim 1 , wherein the second cell wall ( 4 ) is formed by at least one part region of a side wall facing the first cell wall ( 3 ) of a dimensionally stable component of the disposable cell ( 2 ).
22. The diaphragm pump as claimed in claim 21 , wherein the dimensionally stable component of the disposable cell ( 2 ) is formed by a single-part plastics material block.
23. The diaphragm pump as claimed in claim 22 , wherein the dimensionally stable component ( 2 ) has interconnected part elements ( 22 , 23 ) which a pump inlet ( 7 ) and a pump outlet ( 9 ) penetrate, and at least one inlet valve ( 8 ) and at least one outlet valve ( 10 ) are provided in a separating plane of the interconnected part elements ( 22 , 23 ).
24. The diaphragm pump as claimed in claim 23 , wherein the at least one inlet valve ( 8 ) or the at least one outlet valve ( 10 ) or both comprise flutter valves.
25. The diaphragm pump as claimed in claim 1 , further comprising a clamping device, and the disposable cell ( 2 ) is releasably fixable on the pump housing ( 1 ) without any tools by the clamping device ( 209 , 216 , 223 ).
26. The diaphragm pump as claimed in claim 25 , wherein the clamping device ( 209 , 216 , 223 ) has a pivot lever ( 24 ) which ( 24 ) is held so as to be pivotable on the pump housing ( 1 ) and is movable between a release position and a hold position.
27. The diaphragm pump as claimed in claim 25 , wherein the pump housing ( 1 ) has first and second housing parts ( 25 , 26 ), between which the disposable cell ( 2 ) is releasably clampable.
28. The diaphragm pump as claimed in claim 27 , wherein the first and second housing parts ( 25 , 26 ) are movable by the clamping device ( 209 , 216 , 223 ) between a holding position where they are brought closer together and a release position where they are correspondingly spaced apart from one another.
29. The diaphragm pump as claimed in claim 27 , wherein the first housing part ( 25 ) receives the stroke drive therein, and the second housing part ( 26 ) is a cover of the diaphragm pump.
30. The diaphragm pump as claimed in claim 27 , wherein the second housing part ( 26 ) has a recess ( 27 ) into which the disposable cell ( 2 ) is insertable in a positive-locking manner.
31. The diaphragm pump as claimed in claim 30 , wherein the disposable cell ( 2 ) protrudes into the recess ( 27 ) for as long as there is overpressure in the operating space ( 5 ).
32. The diaphragm pump as claimed in claim 27 , wherein positioning aids which secure an established relative position between the first housing part ( 25 ) and the disposable cell ( 2 ) are provided between the first housing part ( 25 ) and the disposable cell ( 2 ).
33. The diaphragm pump as claimed in claim 26 , wherein the pivot lever ( 24 ) of the clamping device ( 223 ) is a toggle lever.
34. The diaphragm pump as claimed in claim 33 , wherein the pivot lever ( 24 ), is held in a self-locking pivot position above a dead center of the toggle lever in the hold position of the clamping device ( 223 ).
35. The diaphragm pump as claimed in claim 34 , wherein the pivot lever ( 24 ) is movable from the hold position into the release position of the clamping device ( 209 , 216 ) against a restoring force of at least one resiliently elastic or rubber-elastic restoring element ( 30 ).
36. The diaphragm pump as claimed in claim 33 , wherein the pivot lever ( 24 ) is pivotable about a pivot axis ( 29 ) which is formed as an eccentric.
37. The diaphragm pump as claimed in claim 26 , wherein the pivot lever ( 24 ) is bow-shaped and clamps or fixes the disposable cell ( 2 ) on the pump housing ( 1 ) with a cross web thereof in the hold position of the clamping device ( 209 , 216 , 233 ).
38. The diaphragm pump as claimed in claim 1 , wherein the diaphragm pump has a pump control, and a data storage unit is provided on the disposable cell ( 2 ) for storing specific data of the disposable cell ( 2 ), the pump control interacts with a reader unit in a region of the pump housing ( 1 ), said reader unit communicates with the pump control and reads information from the data storage unit on the disposable cell ( 2 ).
39. The diaphragm pump as claimed in claim 38 , wherein the data storage unit and the reader unit interact with one another in a wireless manner.