Nonrespiratory diaphragm chucking

• US 20010038796A1
• Filed: 03/15/2001
• Published: 11/08/2001
• Est. Priority Date: 03/16/2000
• Status: Active Grant

• Current Assignee: LEWA GmbH (Atlas Copco AB)
• Original Assignee: LEWA Herbert OTT GmbH & Company
• Inventors: Schluecker, Eberhard
• Granted Patent: US 6,464,474 B2
• Time in Patent Office: Days
• US Class Current: 417/383
• CPC Class Codes: F04B 43/0063 bell-shaped flexible members
• CPC Class Codes: F04B 43/067 the fluid being actuated directly by a piston
• CPC Class Codes: F05C 2225/04 PTFE [PolyTetraFluorEthylene]

Abstract

A diaphragm pump with a pump lid, a pump housing and a hydraulically powered diaphragm that is arranged between the former, that delimits a hydraulic chamber from a delivery chamber and that is clamped in a circulating rim. There is provided between the pump lid and the pump housing an insert part, which is located on the side of the pump lid and which limits the delivery chamber and/or an insert part that is located on the side of the pump housing and that delimits the hydraulic chamber, while the diaphragm at its circulating rim is clamped between the insert part and the pump housing or the pump lid or between insert parts.

Claims

1. Diaphragm pump comprising:

a pump lid,

a pump housing,

a hydraulically driven diaphragm arranged between the pump housing and the pump lid, the diaphragm delimiting a hydraulic chamber from a delivery chamber and being clamped at a circulating rim,

at least one of a first insert part located on a side of the pump lid and limiting the delivery chamber and a second insert part between the pump lid and the pump housing located on a side of the pump housing and limiting the hydraulic chamber,

the diaphragm at the circulating rim being clamped between two of the pump housing, the pump lid, the first insert part and the second insert part.

2. Diaphragm pump according to

claim 1

, wherein the delivery chamber is formed by the first insert part on the side of the pump lid and the first insert part located on the side of the pump lid has a first duct connecting the delivery chamber with a delivery duct made in the pump lid.

3. Diaphragm pump according to

claim 2

, wherein the first insert part located on the side of the pump lid, has a second duct connecting the delivery chamber with a suction duct made in the pump lid.

4. Diaphragm pump according to

claim 1

, wherein the pump lid and the pump housing have fastening means for connecting the pump lid and the pump housing with each other in a pressure-supported manner and that, simultaneously, the first insert part, located on the side of the pump lid, as well as the second insert part, located on the side of the pump housing with the diaphragm between them, will be pressed against each other in a chucking manner.

5. Diaphragm pump according to

claim 1

, wherein the first and the second insert parts are so arranged that they directly abut against each other in a radial area around the circulating rim.

6. Diaphragm pump according to

claim 1

, wherein the first and the second insert parts, together with one of the pump lid and the pump housing, constitute tight sealing points for the diaphragm.

7. Diaphragm pump according to

claim 6

, wherein two tight sealing points are arranged spaced on a same diameter.

8. Diaphragm pump according to

claim 7

, wherein the diameter of the tight sealing points is identical or greater in relation to a diameter of the circulating rim.

9. Diaphragm pump according to

claim 6

, wherein between the first and the second insert parts and the pump lid or the pump housing, there are arranged ducts or free turns so that pressure will be spread all the way to the tight sealing points.

10. Diaphragm pump according to

claim 1

, wherein the diaphragm is so chucked between a predetermined press-on pressure between the pump lid and the pump housing that the pressure in an area of diaphragm chucking is below the a flow boundary of the diaphragm.

11. Diaphragm pump according to

claim 1

, wherein in a chucking area, there is provided at least one elastic part, which, when the diaphragm pump is in operation, the at least one elastic part will elastically adjust any occurring decreases in press-on pressure in the chucking area of the diaphragm between the pump lid and the pump housing.

12. Diaphragm pump according to

claim 1

, wherein the diaphragm comprises two or more material layers where at least one elastic part is arranged between at least two layers.

13. Diaphragm pump according to

claim 12

, wherein the elastic part is made as an elastic intermediate layer.

14. Diaphragm pump according to

claim 12

, wherein the elastic part is made as an elastic intermediate ring.

15. Diaphragm according to

claim 12

, wherein the elastic part is made as a weft.

16. Diaphragm pump according to

claim 11

, wherein the elastic part extends in a circumferential direction over an entire circumference of the diaphragm.

17. Diaphragm pump according to

claim 11

, wherein the elastic part is arranged on at least one side of the diaphragm.

18. Diaphragm pump according to

claim 11

, wherein the elastic part comprises one or several elastomer O-rings.

19. Diaphragm pump according to

claim 11

, wherein the elastic part is made as a lip seal.

20. Diaphragm pump according to

claim 11

, wherein the elastic part is made as an integral part of the diaphragm.

21. Diaphragm pump according to

claim 1

, wherein the diaphragm is made of PTFE or PE.

22. Diaphragm pump according to

claim 1

, wherein the diaphragm is made of an elastomer with a protective layer consisting of PTFE.