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CN-115777049-B - Valve and diaphragm pump with inlet and outlet valves

CN115777049BCN 115777049 BCN115777049 BCN 115777049BCN-115777049-B

Abstract

The invention relates to a valve (100), in particular a flat valve or a non-return valve, for a diaphragm pump, comprising a valve chamber (14) surrounded by a valve housing, in which at least one valve seat (4) is provided, which interacts with a valve plate (10), wherein the valve plate (10) is elastically preloaded by means of an outer edge holder (101) by stretching, such that a closing body (1) of the valve plate (10) can be moved against the elasticity of the valve plate (10) at least in the region of its outer edge holder (101) from a closed position, in which the closing body (1) rests sealingly against the valve seat (4), into an open position, wherein the outer edge holder (101) of the valve plate (10) has a web (2), and wherein the outer edge holder (101) has a connecting clip (5), which is connected to the web end of the web (2) facing away from the closing body (1). The valve (100) according to the invention is characterized in that the outer edge holders (101) act only on the closing body (1) in a manner that they are not connected to one another, each outer edge holder (101) having at least two webs (2), the webs (2) of each outer edge holder (101) being connected to one another by means of a connecting clip (5), and each connecting clip (5) engaging at least one assigned holding base (7) of the valve housing from behind, and the connecting clip (5) projecting laterally on both sides from its assigned holding base (7) such that the connecting clip (5) is pretensioned outwards by bending. The invention also relates to a diaphragm pump in which a valve according to the invention is provided as an inlet valve and/or outlet valve (see fig. 1).

Inventors

  • S. KAUFMAN
  • M. Buch
  • A. Witrich

Assignees

  • 凯恩孚罗德斯股份公司

Dates

Publication Date
20260512
Application Date
20210429
Priority Date
20200511

Claims (20)

  1. 1. Valve (100) for a diaphragm pump, having a valve chamber (14) delimited by a valve housing, in which valve chamber at least one valve seat (4) is provided, which interacts with a valve plate (10) which is elastically preloaded by means of an outer edge holder (101) by stretching, such that a closing body (1) of the valve plate (10) can be moved from a closed position against the elasticity of the valve plate (10) at least in the region of its outer edge holder (101) into an open position, in which closing position the closing body (1) rests sealingly against the valve seat (4), wherein the outer edge holders (101) of the valve plate (10) have webs (2) and the outer edge holders (101) have connection clips (5) which are connected to web ends of the webs (2) facing away from the closing body (1), characterized in that the respective outer edge holders (101) act in a manner not connected to one another only on the closing body (1), each outer edge holder (101) has at least two webs (2), each outer edge holder (101) having at least two webs (2) which engage one connection clip (5) from each other via a connection base (7) of the connection clips (7), and the connector clip (5) protrudes laterally on both sides from its associated holding base (7) in such a way that the connector clip (5) is pretensioned outwards by bending.
  2. 2. Valve according to claim 1, characterized in that the connection clips (5) are connected to the closing body (1) separately from one another by means of webs (2) respectively assigned thereto.
  3. 3. Valve according to claim 1 or 2, characterized in that each edge holder (101) has a centering geometry which interacts with a mating geometry of the at least one assigned holder base (7).
  4. 4. Valve according to claim 1 or 2, characterized in that each edge holder (101) has a pair of webs (2), which webs (2) are connected to one another at their ends facing away from the closing body (1) by means of a common connecting clip (5).
  5. 5. Valve according to claim 1 or 2, characterized in that the connector clip (5) of each edge holder (101) has at least one centring or positioning male or female formation (3; 103) which interacts with a complementary mating formation on the at least one assigned holder base (7).
  6. 6. A valve as claimed in claim 1 or 2, characterized in that the connector clip (5) of each edge holder (101) has a generally centrally arranged male formation (3).
  7. 7. A valve according to claim 1 or 2, characterized in that the web (2) of the outer edge-holding part (101) is arranged on the valve plate (10) on opposite sides of the valve seat (4).
  8. 8. A valve according to claim 1 or 2, characterized in that the webs (2) of the edge holders (101) arranged on opposite sides of the valve plate (10) are arranged in pairs in a substantially line.
  9. 9. Valve according to claim 1 or 2, characterized in that at least one retaining base (7) is formed in its circumferential region acted upon by the associated connector clip (5).
  10. 10. A valve according to claim 1 or 2, characterized in that the valve chamber (14) in the valve housing is delimited by enclosed between valve housing parts (8, 15) which abut each other.
  11. 11. Valve according to claim 10, characterized in that the receiving geometry of the valve housing parts (8, 15) lying against each other for receiving the valve plate (10) has an insertion bevel (6) which, when the housing parts (8, 15) are inserted into each other, places the valve plate (10) between the valve housing parts (8, 15) in a use position preloaded on the edge holders (101) of the valve plate.
  12. 12. A valve according to claim 1 or 2, characterized in that the valve seat (4) protrudes beyond the plane formed by the edge-retaining portion (101) of the valve plate (10).
  13. 13. Valve according to claim 1 or 2, characterized in that each connection clip (5) is designed such that the deformation of the edge holding portion (101) in the region of its connection clip (5) due to the pretension is greater than in the region of the web (2).
  14. 14. Valve according to claim 1 or 2, characterized in that the edge holding portion (101) is designed such that in the open position of the valve (100) the extension of the distance between the male formations (3) arranged on opposite sides of the valve plate (10) is compensated by more than half of the additional bending of the connection clip (5) compared to the closed position.
  15. 15. A valve according to claim 1 or 2, characterized in that each retaining base (7) has a height relative to the abutment plane of the valve housing that is greater than the thickness of the valve plate (10).
  16. 16. A valve according to claim 1 or 2, characterized in that the valve plate (10) is held pretensioned between holding bases arranged on both sides of the valve seat (4) so that a tensile stress acts on the web (2) of the edge holding portion (101) even when the material for the valve plate (10) expands.
  17. 17. A valve according to claim 1 or 2, characterized in that the valve seat (4) protrudes from the abutment plane of the valve housing.
  18. 18. Valve according to claim 1 or 2, characterized in that at least one lifting catch (102) is provided on the side of the valve housing facing away from the valve seat (4), the lifting catch (102) protruding from the abutment plane of the valve housing and limiting the maximum deflection of the closing body (1) in the open position of the valve (100).
  19. 19. Valve according to claim 1 or 2, characterized in that the web (2) has a constant cross section in the region between the connection clip (5) on the one hand and its connection to the closing body (1) on the other hand, or the web has a cross-sectional reduction or narrowing in the region of its connection to the closing body (1).
  20. 20. Valve according to claim 1 or 2, characterized in that the valve plate (10) is spaced apart from the valve housing on the outer circumferential side at least in the region of the connection clip (5).

Description

Valve and diaphragm pump with inlet and outlet valves Technical Field The invention relates to a valve, in particular a flat valve or a non-return valve, for example for a diaphragm pump, having a valve chamber which is delimited by a valve housing, in which at least one valve seat is provided, which interacts with a valve plate, which is elastically preloaded by means of an outer edge holder by stretching, such that a closure body of the valve plate can be moved against the elasticity of the valve plate at least in the region of its outer edge holder from a closed position, in which the closure body rests sealingly against the valve seat, into an open position, wherein the outer edge holder of the valve plate has a web and the outer edge holder has a connection clip, which is connected to a web end of the web facing away from the closure body. The invention also relates to a diaphragm pump having at least one inlet valve and at least one outlet valve. Background A valve of the type mentioned at the outset is known from EP 1,555,469 A1, which has a valve chamber enclosed by a valve housing, in which valve chamber at least one valve seat is provided. A valve seat surrounding the valve opening interacts with a valve plate made of an elastic material. The valve plate is held in the valve housing by the outer edge holder and is prestressed by tension, so that the plate-shaped closing body of the valve plate rests sealingly against the valve seat in the closed position of the valve and can be moved by the pressure difference against the elasticity of the valve plate at least in the region of its outer edge holder into the open position of the valve, in which the closing body is lifted from the valve seat. In this case, each outer edge holding part of the valve plate has a transverse web which is connected to the anchor-shaped transverse web at its web end facing away from the closing body. These transverse webs are clamped in corresponding grooves in the valve housing. In the case of such a so-called anchor valve according to EP 1,555,469 A1, the valve plate does not assume an additional sealing function between the housing parts surrounding the valve housing and the valve chamber arranged therein and compression in the sealing region, which adversely affects the function of the valve plate, is avoided. Since the elastic material for the valve plate is not always chemically resistant to the transport medium and may expand slightly, a gap must be provided around the valve plate in the valve chamber, since otherwise the valve plate may bend during expansion and its function may be adversely affected. However, due to this play, the known anchor valve may lose its positive-locking positioning and the position of the valve plate and its closing body above the valve seat is no longer uniquely defined. A discharge valve for a refrigerant compressor is known from US 3 039 487A. The plate-shaped valve section according to DE 10 2016 002 071 A1 is suitable for a valve, for example of a diaphragm pump, and has a central closure body for loading a valve seat, has a section edge for edge-tensioning the valve section between two housing parts, in particular between two head plates of a pump head of the diaphragm pump, and has a plurality of section webs which are connected to the closure body and to the section edge, respectively, wherein at least two adjacently arranged section webs proceeding from the closure body are bent at least partially in opposite directions and/or angled in opposite directions. In order to sealingly close the valve seat in the closed position of the anchor valve, the valve seat typically protrudes from the abutment plane of the valve housing. The greater the tolerance of this projection, the less sealingly the valve plate and its closing body rest against the valve seat, in particular when the valve is stationary. For a perfect closing performance, very small manufacturing tolerances are therefore required, which can be achieved only with great effort, in particular in micropumps. Finally, in particular in micropumps, the known anchor valve can only be installed into the valve housing with difficulty in an automated production process. A check valve is known from EP 0,336,307 A2, the valve plate of which has an annular seal on the outer periphery, which is connected to a central closing body inside the valve plate by means of a plurality of webs. Thus, even if the valve plate is made of a hard elastic or relatively rigid material, the closing body can perform a valve movement relative to the annular seal clamped in the valve housing, the web being arranged transversely to the radial extension between the outer sealing ring and the inner closing body, so that the closing body can be twisted slightly relative to the sealing ring and simultaneously opened or closed during the valve movement. However, since in this known flat valve the sealing ring of the valve plate is clamped in the valve housing, it i