Diaphragm valve

Abstract

A diaphragm valve (1) having a diaphragm (3) that is clamped between two housing parts (9, 10), and wherein by way of the diaphragm (3), a valve seat (6) can be opened and closed. At least one clamping region (23) is formed radially outside of a clamping region (8), which clamping region (23) protrudes from the clamping region (8), and on the end face of which a sealing surface (11, 12) is formed.

Claims

1. A diaphragm valve (1), comprising: a housing (2) having first and second housing parts (9, 10); a diaphragm (3) arranged within the housing (2) and a center region (4) of said diaphragm supporting a valve body (5), which is movable back and forth in order to at least one of close or open a valve seat (6), the valve body (5) comprising a relief opening (16) on an auxiliary valve seat (17) formed thereon, the diaphragm (3) being clamped in by way of a clamping region (8) thereof between the first and second housing parts (9, 10); the diaphragm (3) having two sealing faces (11, 12), which are arranged transverse to a clamping direction (20) and above and below the clamping region (8), the sealing faces are configured on respective end sides (21, 22) of first and second plug-in regions (23, 24) of the diaphragm (3) which run in a direction parallel to the clamping direction (20); the first housing part (9) comprising a first recess (25), and the first plug-in region (23) engages into the recess (25) of the first housing part (9); the second plug-in region (24) is configured in relation to the clamping region (8) on a side which lies opposite the first plug-in region (23), said second plug-in region (24) engages into a second recess (26) of the second housing part (10); and first and second sealing projections (29, 30) protrude from a recess bottom (27, 28) of the corresponding recess and presses against the first and second sealing faces (11, 12), respectively, wherein a height of the first and second sealing projections (29, 30), which protrudes from the recess bottom (27, 28) of the corresponding recess (25, 26) is substantially smaller than a height of the recess such that the sealing projections (29, 30) press into the respective sealing faces (11, 12), which are configured as planar faces; and wherein at least one gap (33) is configured between the respective plug-in region (23, 24) and the corresponding respective recess (25, 26) such that the plug-in regions (23, 24) can be plugged with play into the respective recesses (25, 26).

2. The diaphragm valve (1) as claimed in claim 1, wherein the first and second plug-in regions (23, 24) protrude as projections from the clamping region (8) at right angles.

3. The diaphragm valve (1) as claimed in claim 1, wherein the first and second recesses (25, 26) are configured to extend around the clamping region (8).

4. The diaphragm valve (1) as claimed in claim 1, wherein at least one of the first or second recesses (25, 26) forms a constriction toward an associated one of the recess bottoms (27, 28).

5. The diaphragm valve (1) as claimed in claim 1, wherein the first and second sealing projections (29, 30) have a cross section which is wedge-shaped and tapers toward a free end (31, 32) thereof.

6. The diaphragm valve (1) as claimed in claim 1, wherein the first and second plug-in regions (23, 24) are configured so as to extend around the clamping region (8) having a constant cross-section.

7. The diaphragm valve (1) as claimed in claim 1, wherein the first and second sealing projections (29, 30) extend over a length of the first and second recesses (25, 26), respectively.

8. The diaphragm valve (1) according to claim 1, wherein the valve seat (6) is closed by the center region (4) of the diaphragm (3) lying with the valve body (5) on the valve seat (6), closing the valve seat in a sealing manner.

9. The diaphragm valve (1) according to claim 1, wherein the valve is opened by emptying a pressure chamber (13) via the relief opening (16) into an outlet (15).

10. The diaphragm valve (1) according to claim 9, wherein the emptying of the pressure chamber (13) leads to an internal pressure in an inlet (14) of the second housing part (10), which causes removal of the valve body (5) from the valve seat (6), resulting in liquid flowing out of the inlet (14) into the outlet (15) of the second housing part (10).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention will now be described in greater detail using one exemplary embodiment, but is not restricted to said exemplary embodiment. Further exemplary embodiments result from a combination of the features of single or plural claims among one another and/or with single or plural features of the exemplary embodiment.

(2) In the drawings:

(3) FIG. 1 shows a side view of a diaphragm valve according to the invention,

(4) FIG. 2 shows a sectional view along A-A of the diaphragm valve in accordance with FIG. 1, and

(5) FIG. 3 shows an enlargement of a detail from FIG. 2.

DETAILED DESCRIPTION

(6) FIGS. 1 to 3 show a diaphragm valve according to the invention which is denoted overall by 1 in different views, and will therefore be described together.

(7) The diaphragm valve 1 has a housing 2 which receives a diaphragm 3 and surrounds it in a manner which forms a housing.

(8) A center region 4 of the diaphragm 3 supports a valve body 5 which can be moved between an upper position which is shown in FIG. 2 and a lower position (not shown in further detail), in which the center region 4 of the diaphragm 3 lies with the valve body 5 on a valve seat 6 and closes said valve seat 6 sealingly.

(9) The diaphragm 3 is clamped in by way of a clamping region 8 between a first housing part 9 and a second housing part 10 radially on the outside in relation to a longitudinal axis 7 of the diaphragm valve 1, which longitudinal axis 7 at the same time describes the movement direction of the valve body 5.

(10) Here, the first housing part 9 and the second housing part 10 form the housing 2, possibly with further housing parts.

(11) Here, the diaphragm 3 has a first sealing face 11 and a second sealing face 12, by way of which it seals a pressure chamber 13 firstly and an inlet 14 secondly to the outside.

(12) The inlet 14 is connected via the valve seat 6 to an outlet 15 when the valve body 5 is situated in the abovementioned upper position, and is disconnected from said outlet 15 when the valve body 5 is arranged in the lower position on the valve seat 6. In order to transfer the valve body 5 into the lower closed position, a relief opening 16 on an auxiliary valve seat 17 is closed by way of an auxiliary valve body (not shown in further detail), with the result that the pressure chamber 13 is filled via a filling opening 18 in the diaphragm 3. As a result of the pressure rise, possibly assisted by way of a spring force, the valve body 5 is transferred into the closed position.

(13) In order to open the diaphragm valve 1, the auxiliary valve seat 17 is released, with the result that the pressure chamber 13 can be emptied via the relief opening 16 into the outlet 15. Said pressure relief leads to the internal pressure in the inlet 14 forcing a removal of the valve body 5 from the valve seat 6, with the result that a liquid can flow out of the inlet 14 into the outlet 15.

(14) A folding region 19 which ensures the movability of the diaphragm 3 is configured between the clamping region 8 and the center region 4. Here, the diaphragm 3 is manufactured from an elastic material, for example rubber, or silicone.

(15) The sealing faces 11, 12 are oriented substantially in a direction which results in an alignment transversely with respect to the clamping direction 20. This means that the perpendiculars on the sealing faces 11, 12 run in each case parallel or approximately parallel to the clamping direction 20, by way of which the first housing part 9 is pressed against the second housing part 10.

(16) To this end, the sealing faces 11, 12 are configured in each case on an end side 21, 22 of a plug-in region 23, 24.

(17) Here, in the mounted state, the plug-in region 23 engages into a corresponding recess 25 on the first housing part 11, whereas the plug-in region 24 is plugged into a corresponding recess 26 on the second housing part 10.

(18) A sealing projection 29, 30 which is pressed into the respective sealing face 11, 12 is configured on each of the recesses 25, 26 on a recess bottom 27, 28.

(19) In order to make the plugging into the recesses 25, 26 possible, each of the plug-in regions 23, 24 is configured as a projection which is oriented at a right angle in relation to the clamping region 8 and protrudes from said clamping region 8.

(20) The plug-in regions 23, 24 run in each case around the clamping region 8 and have a constant profile along their course direction.

(21) In a manner which corresponds with this, the respective recess 25, 26 is likewise configured so as to run around the clamping region 8, and is provided with a cross section, with the result that a groove is formed.

(22) The sealing projection 29, 30 is in each case likewise of circumferential configuration and therefore extends over the entire length of the respective recess 25, 26.

(23) The plug-in regions 23, 24 are configured on sides which lie opposite one another in relation to the clamping region 8, with the result that said plug-in regions 23, 24 can engage into the two receptacles of the recesses 25, 26.

(24) The sealing faces 11, 12 are therefore oriented parallel to one another.

(25) When the first housing part 9 is pressed against the second housing part 10, the sealing projections 29, 30 are pressed into the respective sealing face 11 and 12, respectively.

(26) The sealing faces 11, 12 are configured as planar faces which extend around in an annular manner before said pressing-in operation, however.

(27) A groove or the like for receiving the sealing projections 29, 30 is therefore not configured in the sealing faces 11, 12, with the result that a sealing action is not dependent on whether the plug-in regions 23, 24 are plugged into the respective recesses 25, 26 in a correctly oriented manner.

(28) The recesses 25, 26 have a constriction toward the respective recess bottom 27, 28, and thus form an insertion aid for the plug-in regions 23, 24.

(29) As can be seen in FIG. 3, the sealing projections 29, 30 have a cross section which tapers toward the respective free end 31, 32. Therefore, the sealing projections 29, 30 form a wedge shape (in cross section) which protrudes from the recess bottom 27 and 28, respectively.

(30) This can be seen, since the plug-in regions 23, 24 are configured spaced apart from the recesses 25, 26 in the radial direction, that is to say laterally with respect to their course direction.

(31) In the case of the diaphragm valve 1, in the case of which a diaphragm 3 is clamped in between two housing parts 9, 10 and in the case of which a valve seat 6 can be opened and closed by way of the diaphragm 3, it is therefore provided to configure at least one clamping region 23 radially outside a clamping region 8, which clamping region 23 projects from the clamping region 8 and on the end side 21, 22 of which clamping region 23 a sealing face 11, 12 is configured.

(32) If the plug-in region 23, 24 is introduced into the at least one recess 25, 26, at least one gap 33 is configured between the two. Here, the gap 33 is configured, in particular, between a lateral inner wall 34 of the recess 25, 26 and a lateral outer wall 35 of the plug-in region 23, 24. As a result of the gap 33, the plug-in region 23, 24 can be plugged with a play into the respective recess 25, 26. Therefore, the assembly of the diaphragm valve 1 is simplified considerably.

(33) In order to achieve a sufficient sealing action between the diaphragm 3 and the housing parts 9, 10 despite the configuration of the gap 33, a contact pressure between the outer wall of the plug-in region 23, 24 and the inner wall of the recess 25, 26 is therefore greatest between an end side 21, 22 of the plug-in region 23, 24 and a bottom region of the recess 25, 26. Here, the generated contact pressure is particularly great, in particular, in the region of the sealing projection 29, 30. Therefore, a sufficient sealing action is configured in said region.

LIST OF DESIGNATIONS

(34) 1 Diaphragm valve

(35) 2 Housing

(36) 3 Diaphragm

(37) 4 Center region

(38) 5 Valve body

(39) 6 Valve seat

(40) 7 Longitudinal axis

(41) 8 Clamping region

(42) 9 (First) housing part

(43) 10 (Second) housing part

(44) 11 (First) sealing face

(45) 12 (Second) sealing face

(46) 13 Pressure chamber

(47) 14 Inlet

(48) 15 Outlet

(49) 16 Relief opening

(50) 17 Auxiliary valve seat

(51) 18 Filling opening

(52) 19 Folding region

(53) 20 Clamping direction

(54) 21 End side

(55) 22 End side

(56) 23 Plug-in region

(57) 24 Plug-in region

(58) 25 Recess

(59) 26 Recess

(60) 27 Recess bottom

(61) 28 Recess bottom

(62) 29 Sealing projection

(63) 30 Sealing projection

(64) 31 Free end

(65) 32 Free end

(66) 33 Gap

(67) 34 Lateral inner wall

(68) 35 Lateral outer wall