Membranventil

Abstract

Diaphragm valve (1) for influencing a fluid flow, comprising a valve housing (3) in which a valve chamber (26) is formed, which is delimited by a first wall section (33) and a second wall section (80), wherein a first fluid connection (40) and a second fluid connection (41) are formed on the first wall section (33), which are each connected in a fluidic communication manner to the valve chamber (26), and comprising a valve diaphragm (65) made of a rubber-elastic material, which is accommodated in the valve chamber (26) and has a circumferential sealing edge (67) on an outer circumference, which is sealingly connected to the valve housing (3), wherein a sealing surface (70) of the valve diaphragm (65) facing the first wall section (33) delimits a fluid chamber (27) together with the first wall section (33) of the valve housing (3),wherein the valve membrane (65) is designed, in a first deformation state, for a sealing engagement with a first valve seat (47) associated with the first fluid connection (40) and arranged in the fluid chamber (27), and, in a second deformation state, for a release of the first valve seat (47), wherein a back surface (68) of the valve membrane (65) facing away from the sealing surface (70) is fixed at least in regions to a wall region (89) of the second wall section (80), which is arranged opposite the first wall section (33), and wherein a circular-cylindrical fastening pin (71) extending along a pin axis (34) is formed on the back surface (68), which fastening pin is oriented transversely to the sealing surface (70), and wherein the fastening pin (71) has, at a distance from the back surface (68), a projection (72) extending transversely to the pin axis (34) and designed as an annular collar,which is designed for locking the fastening pin (71) in an undercut (90) of the valve housing (3) and / or that a projection of the fastening pin (71) onto the back surface (68) covers less than 10 percent of the back surface (68).

Description

[0001] The invention relates to a diaphragm valve for influencing a fluid flow, comprising a valve housing in which a valve chamber is formed which is delimited by a first and a second wall section, wherein a first fluid connection, a second fluid connection and / or a third fluid connection are formed on the first wall section, which are each connected in a fluidic communication manner to the valve chamber, and comprising a valve diaphragm made of a rubber-elastic material which is accommodated in the valve chamber and has a circumferential sealing edge on an outer circumference which is sealingly connected to the valve housing, wherein a sealing surface of the valve diaphragm facing the first wall section, together with the first wall section of the valve housing, delimits a fluid chamber,wherein the valve membrane is designed in a first deformation state for a sealing engagement with a first valve seat assigned to the first fluid connection and arranged in the fluid chamber, and in a second deformation state for a release of the first valve seat,

[0002] From EP 2 817 543 B1 a diaphragm valve is known which has a valve housing and a valve member which is movable relative to it, wherein the valve member has a diaphragm carrier which can be driven to carry out a switching movement and which carries a sealing diaphragm fastened to it which delimits a valve chamber in which a valve seat is located, wherein the sealing diaphragm has a sealing section which is opposite the valve seat and which belongs at least partially to a loose diaphragm section of the sealing diaphragm which can be lifted off the diaphragm carrier in order to reduce the stress on the sealing diaphragm when the latter is removed from the valve seat during switching.

[0003] DE 10 2005 021 583 A1 discloses a valve device comprising a housing body in which a fluidic chamber with at least one sealing seat is formed, and a switching body that is cast in one piece and comprises a rigid frame and a flexible diaphragm with at least one closing body integrated therein. The switching body is mounted on the housing body, tightly sealing the fluidic chamber with the diaphragm, and with the closing body positioned opposite the sealing seat.

[0004] DE 20 2014 103 142 U1 discloses a diaphragm valve with a housing that defines a drive chamber and a working chamber, wherein the drive chamber and the working chamber are separated by a diaphragm that can close or open at least one sealing seat in the working chamber that is assigned to a flow channel, wherein the diaphragm is fastened in at least one fastening region to a driver arranged in the drive chamber that is movable via a drive, the diaphragm has a reinforcing fabric layer that is embedded in an elastic carrier material of the diaphragm, and cooperating structures are formed in the fastening region and in the driver, by means of and on which a positive or material connection between the elastic carrier material of the diaphragm and the driver is present and which form a fixed connection between the diaphragm and the driver.

[0005] JP 2013-61 019 A discloses an electromagnetic valve comprising an actuator with a fixed iron core and a movable iron core, wherein the valve has an oscillating rocker arm element pivoted to the valve with an oscillation shaft as a center, wherein the rocker arm element is formed differently from a first valve and a second valve, whereby the first valve and the second valve can be pressed vertically against a first valve seat and a second valve seat, and the electromagnetic valve can uniformly exert a sealing force and press the diaphragms vertically against the valve seats.

[0006] JP 2006-57644 A discloses a solenoid valve formed by forming a COM port, an NC port, and an NO port in a housing. To connect the ports to a valve chamber, a first valve seat and a second valve seat are provided in opening portions where the NO port and the NC port are opened in the valve chamber, respectively. A swing valve is also provided, supported in the housing so as to swing by a magnetic mechanism to alternately cause a diaphragm to engage or disengage from the first and second valve seats and switch a connected state of the ports. The area of ​​the COM port is twice or more and 2.5 times or less of the area of ​​the NC port or the NO port.

[0007] The object of the invention is to provide a diaphragm valve which has a reduced flow resistance for both overpressure and underpressure applications.

[0008] This object is achieved for a diaphragm valve of the type mentioned at the outset with the features of claim 1. It is provided that a back surface of the valve diaphragm facing away from the sealing surface is fixed, in particular fastened, at least in part to a wall region of the second wall section, which is arranged opposite the first wall section. Accordingly, in addition to being fixed to the edge of the circumferentially formed sealing edge, which can in particular be designed as a circumferential sealing bead, the valve diaphragm is fixed at the rear to the second wall section, thereby restricting the freedom of movement of a central region of the valve diaphragm extending radially inward from the sealing edge.Preferably, the sealing edge of the valve membrane is clamped in a force-fitting manner or, with a suitable design of the first wall section and / or the second wall section, in a form-fitting manner, thereby also sealingly. Additionally or alternatively, the thickness of the valve membrane can be constant across its entire surface, at least in those membrane regions that are deformed in the first deformation state and / or the second deformation state. If the sealing edge is designed as a sealing bead, it has a greater thickness than the rest of the valve membrane.

[0009] These measures prevent the valve diaphragm from coming into flat contact with the first wall section of the valve housing due to elastic deformation of the central region when the diaphragm valve is used for vacuum applications. This would lead to an undesired blockage or reduction of a fluidically communicating connection between the first fluid connection and the third fluid connection or between the second fluid connection and / or the third fluid connection, which would cause the diaphragm valve to malfunction. In a first embodiment of the first wall section, it is provided with the first fluid connection and a second fluid connection, wherein the diaphragm valve in this case is designed as a 2 / 2-way valve.In a second embodiment of the first wall section, it is provided with the first fluid connection and a third fluid connection, wherein the diaphragm valve in this case is designed as a 2 / 2-way valve. The term "third" in connection with the fluid connection serves merely to distinguish between the two and is not to be understood as a number. In a third embodiment of the first wall section, it is provided with the first fluid connection, a second fluid connection, and a third fluid connection, wherein the diaphragm valve in this case is designed as a 3 / 2-way valve.

[0010] Preferably, the first wall section is formed as the surface of a first valve housing part, which can also be referred to as a channel plate and which can be exchangeably attached to a second valve housing part that forms the second wall section. Thus, for example, by selecting a first valve housing part that has the second fluid connection or the third fluid connection in addition to the first fluid connection, a 2 / 2-way valve can be created without having to influence the valve diaphragm or the second valve housing part or a drive device. Alternatively, a first valve housing part can be selected that has the second fluid connection and the third fluid connection in addition to the first fluid connection, in order to thereby form a 3 / 2-way valve without having to influence the valve diaphragm or the second valve housing part or a drive device.This enables modular adaptation of the diaphragm valve to different applications by replacing the first valve housing part, also known as the channel plate.

[0011] Preferably, the region of the back surface intended for attachment to the wall region of the second wall section is selected such that elastic deformation of the valve diaphragm into the first deformation state or into the second deformation state, which is necessary for a sealing engagement of the sealing surface with the first valve seat or with the second valve seat, is not impaired. Furthermore, by attaching the back surface to the wall region of the second wall section in some regions, an increase in the sealing surface and an increase in the cross section of the fluid space used for a fluid flow can be achieved compared to a valve diaphragm known from the prior art, whereby the desired reduction in flow resistance in the diaphragm valve can be achieved.

[0012] Advantageous further developments of the invention are the subject of the subclaims.

[0013] It is expedient if a fastening pin, preferably of circular cylindrical design, extending along a pin axis and oriented transversely to the sealing surface is formed on the back surface. The fastening pin serves to mechanically connect the valve diaphragm to the wall region of the second wall section. The fastening pin is preferably made of a rubber-elastic material. In particular, the fastening pin is formed integrally with the valve diaphragm. The fastening pin extends along a pin axis that is oriented transversely to the undeformed sealing surface. The undeformed sealing surface of the valve diaphragm is preferably flat, so that the perpendicular orientation of the pin axis allows for an advantageous flow of force between the valve diaphragm and the fastening pin formed thereon, as well as the second wall section.For example, when the fluid chamber is subjected to negative pressure, tensile forces are introduced onto the fastening pin. By supporting these tensile forces, which act from the sealing surface onto the fastening pin, on the wall region of the second wall section, local deformation of the valve diaphragm in the region of the fastening pin is prevented. This prevents unwanted blockage of a fluidically communicating connection between the first fluid port and the third fluid port or between the second fluid port and the third fluid port. Accordingly, even when the fluid chamber is subjected to negative pressure, the switching function of the diaphragm valve is ensured exclusively by the elastic deformation of the valve diaphragm in the region of the first valve seat or the second valve seat.

[0014] In an advantageous development of the invention, it is provided that the fastening pin, at a distance from the back surface, has a projection extending transversely to the pin axis, in particular an annular collar, which is designed for a, in particular elastic, locking of the fastening pin in an undercut of the valve housing and / or that a projection of the fastening pin onto the back surface covers less than 10 percent of the back surface. By locking the projection formed on the fastening pin in an undercut of the valve housing, an advantageous force transmission between the valve membrane and the valve housing is ensured. This applies in particular in the case that the projection is designed as an annular collar, which rests with an annular surface facing the first wall section on a corresponding annular surface of an undercut formed in the valve housing.For example, a bore, in particular one with a circular cylindrical design, is provided in the second wall section, which bore widens, in particular abruptly, with increasing distance from the valve chamber. This preferably forms a circular ring-shaped bearing surface that can be used as an undercut for the fastening pin. It is particularly preferably provided that a distance between the back surface of the valve diaphragm and the projection on the fastening pin is selected to be equal to or slightly smaller than a distance between the wall region of the second wall section and the diameter jump in the bore of the valve housing. Accordingly, when the fastening pin is mounted in the bore in the valve housing, a slight elastic preload is brought about for the fastening pin, which is advantageous for precise, predictable contact of the back surface of the valve diaphragm with the wall region of the second wall section.

[0015] Additionally or alternatively, it is provided that a projection of the fastening pin onto the back surface of the valve diaphragm has a projection area whose size covers less than 10 percent of the back surface. This only slightly influences the overall elasticity of the valve diaphragm, so that the valve diaphragm can assume both the first deformation state and the second deformation state for the sealing connection at the first fluid connection or the second fluid connection exclusively through elastic deformation.

[0016] It is advantageous if the first fluid connection, the second fluid connection, and the third fluid connection are formed on the first wall section, each of which is fluidically connected to the valve chamber, and that the valve diaphragm, in the second deformation state, is designed for a sealing engagement with a second valve seat assigned to the second fluid connection and arranged in the fluid chamber, wherein the third fluid connection is arranged between the first fluid connection and the second fluid connection. With such a design of the first valve housing part, the diaphragm valve is configured as a 3 / 2-way valve. Due to the arrangement, in particular centrally, of the third fluid connection between the first fluid connection and the second fluid connection, an advantageous fluid flow can be achieved from the first or second fluid connection to the third fluid connection or in the reverse direction.Preferably, the valve membrane is partially secured to the wall region of the second wall section in a space extending between the first valve seat and the second valve seat, with its back surface. Particularly preferably, the valve membrane is secured, in particular fastened, to the second wall section exactly opposite the third fluid connection.

[0017] In a further embodiment of the invention, a first coupling pin, preferably with a circular-cylindrical profile, is arranged on the back surface coaxially and opposite a first fluid recess of the first valve seat, and a second coupling pin, preferably with a circular-cylindrical profile, is formed on the back surface coaxially and opposite a second fluid recess of the second valve seat. The first coupling pin and the second coupling pin serve to stabilize the valve diaphragm in the region of the first valve seat and the second valve seat, respectively. This is particularly important when the diaphragm valve is used for vacuum applications, in particular to avoid local deformation of the valve diaphragm in the region of the first valve seat and the second valve seat, respectively.Furthermore, the first coupling pin and the second coupling pin serve to locally connect a region of the back surface of the valve diaphragm to a first actuating plunger and a second actuating plunger, respectively, with which tensile forces can be introduced onto the valve diaphragm in order to lift it from the respective valve seat.

[0018] It is preferably provided that an annular, preferably circular, first depression is formed in the first wall section surrounding the first valve seat, which is designed in particular as a first hollow cone section, and that an annular, preferably circular, second depression is formed in the first wall section surrounding the second valve seat, which is designed in particular as a second hollow cone section, wherein a groove is formed in the first wall section between the first depression and the second depression, wherein a groove width of the groove is at least 70 percent, preferably at least 80 percent, particularly preferably at least 85 percent of a maximum extent of the first depression or the second depression. The first depression assigned to the first valve seat and the second depression assigned to the second valve seat initially serve to create a precisely defined sealing surface on the first valve seat oron the second valve seat. This sealing surface preferably surrounds an orifice of the first valve seat or the second valve seat in a ring-shaped manner.

[0019] It is particularly preferably provided that the first valve seat and / or the second valve seat are designed as a hollow cone section which, starting from the first wall section, is tapered in the direction of the valve membrane in order to ensure a particularly advantageous sealing surface on the respective valve seat for the valve membrane.

[0020] Furthermore, the first recess and the second recess as well as the groove formed between the first and the second recess serve to provide an advantageous cross-section for the fluid that is to flow between the first fluid connection and the third fluid connection or between the second fluid connection and the third fluid connection. Due to the support of the valve diaphragm on the back surface, closure of the groove due to elastic deformation of the valve diaphragm is prevented, particularly when the diaphragm valve is used for vacuum applications. Accordingly, the groove can have a large width relative to the maximum extent of the first recess or the second recess, since, in contrast to the prior art, no support of the valve diaphragm by regions of the first wall section adjacent to the groove is required.It is preferably provided that the first recess and / or the second recess are each circular in shape, so that the groove width can be determined in relation to a diameter of the first recess or the second recess.

[0021] In a further embodiment of the invention, a first bottom region of the first recess and a second bottom region of the second recess and a groove base of the groove are arranged in a common bottom plane. The bottom plane is preferably aligned parallel to a surface of the first wall section facing the second wall section. The arrangement of the first and second bottom regions and the groove base in the common bottom plane enables advantageous fluid flow between the fluid connections. In particular, unwanted vortices and turbulence can be avoided, and low flow resistance for the fluid is achieved.

[0022] Preferably, a center of a connection bore of the third fluid connection is arranged at a distance transverse to a connecting line between the first fluid connection and the second fluid connection that is at least 50 percent of the diameter of the connection bore. Such an arrangement of the connection bore provides space for the arrangement of hose couplings, such as those typically attached to the fluid connections to allow fluid hoses to be attached and removed therefrom.While an arrangement of all hose couplings on the connecting straight line can occasionally result in space problems, the lateral displacement of the third fluid connection relative to the connecting straight line between the first fluid connection and the second fluid connection increases the distance between adjacent hose couplings, which simplifies the operation of the hose couplings on the diaphragm valve.

[0023] In a further embodiment of the invention, it is provided that the second wall section of the valve housing is penetrated by a first guide recess arranged opposite the first valve seat and by a second guide recess arranged opposite the second valve seat, wherein a first actuating plunger is received in the first guide recess in a linearly movable manner and wherein a second actuating plunger is received in the second guide recess in a linearly movable manner and wherein a coupling rocker, which rests with a first end region on a first end face of the first actuating plunger facing away from the valve membrane and which rests with a second end region on a second end face of the second actuating plunger facing away from the valve membrane, is pivotally mounted on the valve housing, and wherein a drive device is arranged in the valve housing,which is designed to initiate a linear drive movement on the first end region or the second end region of the coupling rocker. The two guide recesses each serve to linearly guide the associated actuating plunger, which rests on the back surface of the valve diaphragm with a first or second contact surface facing the valve diaphragm. The actuating plungers serve to transmit actuating forces from the drive device via the coupling rocker to the valve diaphragm. Preferably, the respective actuating plunger pin engages around the respective fastening pin arranged on the back surface in order to enable the advantageous application of both tensile forces and tensile forces to the valve diaphragm.

[0024] The function of the coupling rocker is to positively couple the movements of the first actuating plunger and the second actuating plunger, so that an overflow of fluid between the first fluid connection and the second fluid connection can be at least largely prevented. The coupling rocker thus ensures that the valve diaphragm either assumes the first deformation state, in which the sealing surface of the valve diaphragm is in sealing contact with the first valve seat, or that the valve diaphragm assumes the second deformation state, in which the sealing surface of the valve diaphragm is in sealing contact with the second valve seat.The drive device is preferably designed as a magnetic drive with a magnetic coil, a magnetic yoke, and an armature part arranged so as to be relatively movable in the magnetic coil. The armature part is preferably held in a preferred position by the action of a preloaded spring and is displaced along a coil axis by the action of a magnetic flux provided by the magnetic coil. By displacing the armature part, for example, an actuating force exerted on the first end region of the coupling rocker can be reduced, so that the associated first actuating piston performs a linear movement and the valve diaphragm is lifted from the first valve seat. At the same time, a force is applied to the second actuating piston, so that the valve diaphragm comes into sealing contact with the second valve seat. The armature part is preferably arranged coaxially to the valve seat of the first fluid connection.

[0025] It is particularly preferred that a return spring is assigned to the first and / or the second actuating plunger in order to determine a preferred position for the first or second actuating plunger arranged remotely from the first or second valve seat, and / or that the drive device is designed as a solenoid drive. The task of the return spring is to establish a preferred position for the respective actuating plunger, wherein both the return spring assigned to the first actuating plunger and the return spring assigned to the second actuating plunger are designed such that the respective actuating plunger can be held in a preferred position arranged remotely from the first or second valve seat.

[0026] An advantageous embodiment of the invention is illustrated in the drawing. Fig. 1 a perspective view of a diaphragm valve, Fig. 2 a longitudinal section of the diaphragm valve according to the Fig. 1, Fig. 3 a detail view of a cross section of the diaphragm valve according to the Fig. 1, Fig. 4 a plan view of a valve membrane for the diaphragm valve according to the Fig. 1, Fig. 5 a perspective view of a first valve housing part Fig. 6 a sectional view of the first valve housing part according to the Fig. 5, Fig. 7 a plan view of a first variant of the first valve housing part, Fig. 8 a sectional view of a second variant of the first valve housing part, and Fig. 9 a sectional view of a third variant of the first valve housing part.

[0027] One in the Fig. 1 schematically illustrated diaphragm valve 1 comprises a substantially cuboid-shaped drive housing 2 and a valve housing 3, which is composed purely by way of example of the first valve housing part 4 and a second valve housing part 5. The first valve housing part 4 is attached to an underside of the second valve housing part 5, while the second valve housing part 5 is connected to the drive housing 2. The first valve housing part 4 and a partial region of the second valve housing part 5 extend laterally beyond a cross-sectional profile of the drive housing 2 and thereby form fastening tongues 6, each penetrated by fastening bores 7, thus enabling a screw fastening (not shown) of the diaphragm valve 1 to a valve carrier (not shown).

[0028] As the representation of the Fig. 2, a drive device 10 is accommodated in the drive housing 2, which is designed purely as an example as a solenoid drive. Accordingly, the drive device 10 comprises a solenoid coil 11 wound on a winding body 15 that is rotationally symmetrical to a central axis 12. A recess 16, designed, for example, as a circular cylinder, in the winding body 15 is provided to accommodate a stationary coil core 17 and an armature part 18 mounted for linear movement along the central axis 12. The armature part 18 is elastically supported on the armature part 18 by means of a helical spring 19.An end region of the coil core 17 opposite the armature part 18 is magnetically conductively connected to a purely exemplary C-shaped yoke 20, which extends from a first axial surface 21 of the magnetic coil 11 to a second axial surface 22 of the magnetic coil 11 and which is penetrated by a recess 23 formed coaxially to the central axis 12, through which the armature part 18 projects beyond the yoke 20.

[0029] The magnetic coil 11 can be connected to an electrical power source in a manner not shown in detail, wherein by providing a coil current to the magnetic coil 11, a magnetic flux originating from the magnetic coil 11 is coupled into the coil core 17 and the yoke 20 as well as the armature part 18. In an air gap 24 between the armature part 18 and the coil core 17, there is initially a high magnetic flux resistance, whereby magnetic field forces occur between the armature part 18 and the coil core 17. These magnetic field forces lead to an elastic deformation of the helical spring 19 and to an approach of the armature part 18 to the coil core 17. When the coil current for the magnetic coil 11 is reduced or switched off, the magnetic field forces in the air gap 24 also decrease, so that the helical spring 19 moves the armature part 18 from the approach position (not shown) into the Fig. 2 are shown distance position can shift.

[0030] The first valve housing part 4 is designed purely as an example as a plane-parallel plate, wherein, in addition to the fastening bores 7, a total of three fluid recesses 30, 31, and 32 penetrate the first valve housing part 4. Each of the fluid recesses 30 to 32 has a central axis that is aligned normal to a top side of the first valve housing part 4, also referred to as the first wall section 33 and, for example, flat. The central axis of the first fluid recess 30 is identical to the central axis 12. The second fluid recess 31 has a central axis referred to as the pin axis 34. The third fluid recess 32 has a central axis 35.

[0031] By way of example, it is provided that on an underside 36 of the first valve housing part 4, an opening of the first fluid recess 30 forms a first fluid connection 40. Furthermore, an opening of the second fluid recess 31 forms a second fluid connection 41. An opening of the third fluid recess 32 forms a third fluid connection 42.

[0032] An opening of the first fluid recess 30 associated with the first wall section 33 of the first valve housing part 4 is formed by a first hollow cone section 45 which tapers with increasing distance from the underside 36 of the first valve housing part 4 and forms a first valve seat 47 on an annular end face facing away from the underside 36. By way of example, it is provided that an identical second hollow cone section 46 is assigned to the second fluid recess 31 and forms a second valve seat 47. The first hollow cone section 45 is surrounded by a first recess 49 which, purely by way of example, is circularly cylindrical, and the second hollow cone section 46 is surrounded by a second recess 50 which, purely by way of example, is circularly cylindrical.Between the first recess 49 and the second recess 50 there extends a purely exemplary rectangular profiled groove 51 which is widened in a wedge shape at a first end region 52 facing the first recess 49 and at a second end region 53 facing the second recess 50.

[0033] For example, it is planned that the Fig. 2, Fig. 3, Fig. 5 and Fig. 6, is arranged centrally on a connecting line 54 between the first fluid recess 30 and the second fluid recess 31. By way of example, the third fluid recess 32, which is initially circularly cylindrical, has a conical-segment-shaped mouth region 55 that widens with increasing distance from the underside 36 of the first valve housing part 4. By way of example, it is provided that a first bottom region 56 of the first recess 49, a second bottom region 57 of the second recess 50, and a groove base 58 of the groove 51 are arranged in a common plane that is arranged parallel and spaced from the first wall section 33 of the first valve housing part 4.Furthermore, it is provided that the first hollow cone section 45 and the second hollow cone section 46 extend beyond the first wall section 33 of the first valve housing part 4, which is related to the functioning of the valve membrane 65 described in more detail below.

[0034] By way of example, it is provided that a first diameter 59 of the first recess 49 and a second diameter 60 of the second recess 50 are identical. Furthermore, it is provided that a groove width 61 of the groove 51 is approximately 85 percent of the first diameter 59 and the second diameter 60.

[0035] The second valve housing part 5 has a purely exemplary flat underside facing the first valve housing part 4, which is also referred to as the second wall section 80. A recess 81 is formed in the second wall section 80, the bottom region 82 of which has a predeterminable distance from the second wall section 80. The recess 81 is bordered by a circumferential groove 83, which has a greater distance from the second wall section 80 than the bottom region 82 and which, purely exemplary, has a rectangular profile, as shown in the Fig. 2. The rectangular profile of the groove 83 extends along a profile line not shown in detail, which is, however, identical to one shown in the Fig. 4 in the top view of the valve membrane 65 drawn profile line 66 of a circumferential sealing edge 67.

[0036] Starting from the bottom region 82 of the recess 81, the second valve housing part 5 is, for example, penetrated by a total of three recesses. The first recess can also be referred to as the first guide recess 84. The second recess can be referred to as the second guide recess 85. Both the first guide recess 84 and the second guide recess 85 each extend through a circular sleeve-shaped guide section 87 or 88 adjacent to the bottom region 82, wherein the guide sections 87 and 88 are components of the second valve housing part 5. The third recess 86 extends from the bottom region 82 through a wall region 89, which extends in plate-like fashion between the first guide section 87 and the second guide section 88 and which has an upper side that can be used as an undercut 90 for the valve membrane 65 described in more detail below.

[0037] In the first guide recess 84 of the first guide section 87, a first actuating plunger 93 is accommodated in a linearly movable manner, said plunger having a first circumferential annular collar 95 at an end region facing away from the valve membrane 65. The second actuating plunger 94 accommodated in the second guide recess 85 of the second guide section 88 has a second annular collar 96. Between a first axial surface 97 of the first annular collar 95, which faces the first valve housing part 4, and the upper side of the first guide section 87, a first return spring 99 is arranged, which is designed purely by way of example as a prestressed helical spring and has a Fig. 2 exerts a vertically upward pressure force on the axial surface 97. Similarly, a second return spring 100 is assigned to an axial surface 98 of the second actuating plunger 94.

[0038] In order to ensure a positive coupling of movements of the first actuating plunger 93 and the second actuating plunger 94, a cutting edge bearing 105 is formed on the second housing part 5 purely by way of example, the non-bearing cutting edge 111 of which points in the direction of the first valve housing part 4. A coupling rocker 106 is pivotally mounted on the cutting edge bearing 105, which rests with a first end region 107 on a first end face 101 of the first actuating plunger 93 and with a second end region 108 on a second end face 102 of the second actuating plunger 94. The interaction between the coupling rocker 106 and the actuating plungers 93 and 94 ensures the desired positive coupling for the movements of the two actuating plungers 93 and 94.Movement is initiated on the two actuating plungers 93 and 94 with the aid of the armature part 18, which rests on the first end region 107 of the coupling rocker 106. Without energization of the solenoid coil 11, the armature part 18 presses the first end region 107 and thus the first actuating plunger 93 in the direction of the first valve housing part 4 due to the spring action of the helical spring 19, which also compresses the first return spring 99. If the solenoid coil 11 is energized, the armature part 18 moves closer to the coil core 17, whereby the pressure force of the armature part 18 on the first end region 107 of the coupling rocker 106 is reduced. The spring force stored in the first return spring 99 causes a linear upward movement of the first actuating piston 93 and, due to the forced coupling by means of the coupling rocker 106, a downward movement of the second actuating piston 94.

[0039] The movements of the first actuating plunger 93 and the second actuating plunger 94 occur in opposite directions due to the coupling effect of the coupling rocker 106, with each of the actuating plungers 93, 94 resting against a back surface 68 of the valve diaphragm 65 with a first contact surface 103 or a second contact surface 104, respectively. This allows pressure forces to be transferred from the respective actuating plunger 93 or 94 to the valve diaphragm 65.

[0040] Before assembly into the diaphragm valve 1, the valve diaphragm 65 has a sealing surface 70 surrounded by the sealing edge 67, which is purely exemplary and flat. The sealing surface 70 can be geometrically approximated as a combination of two spaced-apart circular surfaces with a rectangle arranged between them. The sealing surface 70 is, as shown in the Fig. 2 and Fig. 3 faces the first valve seat 47 and the second valve seat 48 and can be pressed sealingly against the respective valve seat 47 or 48 by elastic deformation with the aid of the associated actuating pistons 93 and 94 in the first or second deformation position, so that an outflow of fluid from the respective fluid recess 30 or 31 can be prevented.

[0041] For example, the back surface 68 has a similar geometry to the sealing surface 70, but is provided with a centrally arranged, in the installation situation according to the Fig. 2 is provided with a fastening pin 71 aligned coaxially with the pin axis 34 of the third fluid recess 32, which is formed purely by way of example as a circular cylinder. The fastening pin 71 serves to secure a region of the back surface 68 to the wall region 89 of the second valve housing part 5; accordingly, a diameter of the fastening pin 71 is adapted to a diameter of the third recess 86, which penetrates the wall region 89. Furthermore, the fastening pin 71 is provided with an annular collar serving as a projection 72, which is designed for flat contact with the upper side 90 of the wall region 89 and thus enables a positively locking fastening of the fastening pin 71 to the second valve housing part 5.

[0042] As the installation situation according to the Fig. 2, the valve membrane 65 has first and second coupling pins 73, 74 which are arranged coaxially to the central axis 12 and to the central axis 35 of the second fluid recess 31 and are purely exemplary in the form of a circular cylinder, which are provided for receiving in a first and second axial bore 109, 110 of the first and second actuating plunger 93, 94, respectively. The task of the first coupling pin 73 and the second coupling pin 74 is, on the one hand, to stabilize the valve membrane 65 in the region of the respective valve seat 47 or 48. Furthermore, the first and second coupling pins 73, 74 serve to introduce tensile forces which can be applied by the first and second actuating pistons 93 and 94 depending on the respective functional position, which is determined by the coupling rocker 106 and the axial position of the armature part 18.

[0043] As the installation situation according to the Fig. 2, the first valve housing part 4 and the second valve housing part 5 define a valve chamber 26, wherein the valve chamber 26 is separated by the valve membrane 65 into a fluid-free area, which according to the illustration of the Fig. 2 is to be located above the valve membrane 65 and into a fluid-carrying area which, according to the illustration of the Fig. 2 is located below the valve membrane 65. The fluid-carrying area of ​​the valve chamber 26, which is delimited by the first valve housing part 4 and the sealing surface 70 of the valve membrane 65, is also referred to as the fluid chamber 27.

[0044] As already described above, the first valve housing part 4 is penetrated by a total of three fluid recesses 30 to 32, each of which opens into the fluid chamber 27. Depending on a deformation of the valve membrane 65, which is pressed in a sealing manner either by the first actuating piston 93 onto the first valve seat 47 or by the second actuating piston 94 onto the second valve seat 48, a fluidically communicating connection between the second fluid recess 30 and the third fluid recess 32 or between the first fluid recess 30 and the third fluid recess 32 is blocked or released.

[0045] The Fig. The valve housing part 114 shown in Figure 7 is a variant of the valve housing part Fig. 2, Fig. 5 and Fig. 5 and differs only in the arrangement of the third fluid recess 32. The third fluid recess 32 is arranged here at a distance 115 from the connecting line 54. This simplifies the operation of hose couplings (not shown) of fluid hoses, which can be attached to the respective fluid connections 40 to 42 on an underside of the first valve housing part 114, compared to the first valve housing part 4 due to the greater distance between the fluid connections 40 to 42.

[0046] The Fig. The valve housing part 204 shown in Figure 8 is a further variant of the valve housing part Fig. 2, Fig. 5 and Fig. 5 and differs from the valve housing part 4 in that only the first fluid connection 40 with the associated valve seat 47 and the third fluid connection 42 are provided, which are designed in the same way as in the first valve housing part 4. The first valve housing part 204 can be attached to the second valve housing part 5 instead of the first valve housing part 4 or the first valve housing part 114; the diaphragm valve thus formed (not shown) is then configured as a 2 / 2-way valve.

[0047] The Fig. The valve housing part 304 shown in Figure 9 is a further variant of the valve housing part Fig. 2, Fig. 5 and Fig.5 and differs from the valve housing part 4 in that only the first fluid connection 40 with the associated valve seat 47 and the second fluid connection 41, but without a valve seat, are provided, which are designed in the same way as the first valve housing part 4. The first valve housing part 304 can be attached to the second valve housing part 5 instead of the first valve housing part 4 or the first valve housing part 114 or the first valve housing part 204; the diaphragm valve thus formed (not shown) is then configured as a 2 / 2-way valve.

Claims

[1] Diaphragm valve (1) for influencing a fluid flow, comprising a valve housing (3) in which a valve chamber (26) is formed, which is delimited by a first wall section (33) and a second wall section (80), wherein a first fluid connection (40) and a second fluid connection (41) are formed on the first wall section (33), which are each connected in a fluidic communication manner to the valve chamber (26), and comprising a valve diaphragm (65) made of a rubber-elastic material, which is accommodated in the valve chamber (26) and has a circumferential sealing edge (67) on an outer circumference, which is sealingly connected to the valve housing (3), wherein a sealing surface (70) of the valve diaphragm (65) facing the first wall section (33) together with the first wall section (33) of the valve housing (3) delimits a fluid chamber (27),wherein the valve membrane (65) is designed, in a first deformation state, for a sealing engagement with a first valve seat (47) associated with the first fluid connection (40) and arranged in the fluid chamber (27), and, in a second deformation state, for a release of the first valve seat (47), wherein a back surface (68) of the valve membrane (65) facing away from the sealing surface (70) is fixed at least in regions to a wall region (89) of the second wall section (80), which is arranged opposite the first wall section (33), and wherein a circular-cylindrical fastening pin (71) extending along a pin axis (34) is formed on the back surface (68), which fastening pin is oriented transversely to the sealing surface (70), and wherein the fastening pin (71) has, at a distance from the back surface (68), a projection (72) extending transversely to the pin axis (34) and designed as an annular collar,which is designed for locking the fastening pin (71) in an undercut (90) of the valve housing (3) and / or that a projection of the fastening pin (71) onto the back surface (68) covers less than 10 percent of the back surface (68). [2] Diaphragm valve (1) according to claim 1, characterized by that the first fluid connection (40) and the second fluid connection (41) and a third fluid connection (42) are formed on the first wall section (33), each of which is connected in a fluidly communicating manner to the valve chamber (26), and that the valve membrane (65) in the second deformation state is designed for a sealing engagement with a second valve seat (48) assigned to the second fluid connection (41) and arranged in the fluid chamber (27), wherein the third fluid connection (42) is arranged between the first fluid connection (40) and the second fluid connection (41). [3] Diaphragm valve (1) according to claim 2, characterized bythat a first coupling pin (73) is formed on the back surface (68) coaxially and opposite a first fluid recess (30) of the first valve seat (47) and that a second coupling pin (74) is formed on the back surface (68) coaxially and opposite a second fluid recess (31) of the second valve seat (48). [4] Diaphragm valve (1) according to claim 2 or 3, characterized by that an annular first recess (49) is formed in the first wall section (33) surrounding the first valve seat (47) and that an annular second recess (50) is formed in the first wall section (33) surrounding the second valve seat (48), wherein a groove (51) is formed in the first wall section (33) between the first recess (49) and the second recess (50), wherein a groove width (61) of the groove (51) is at least 70 percent of a maximum extent of the first recess (49) or the second recess (50). [5] Diaphragm valve (1) according to claim 4, characterized by that a first bottom region (56) of the first recess (49) and a second bottom region (57) of the second recess (50) and a groove base (58) of the groove (51) are arranged in a common bottom plane. [6] Diaphragm valve (1) according to one of claims 2 to 5, characterized by that a center point of a connection bore of the third fluid connection (42) is arranged at a distance transverse to a connecting line (54) between the first fluid connection (40) and the second fluid connection (41) which is at least 50 percent of a diameter of the connection bore. [7] Diaphragm valve (1) according to one of claims 2 to 6, characterized bythat the second wall section (80) of the valve housing (3) is penetrated by a first guide recess (84) arranged opposite the first valve seat (47) and by a second guide recess (85) arranged opposite the second valve seat (48), wherein a first actuating plunger (93) is received in the first guide recess (84) in a linearly movable manner and wherein a second actuating plunger (94) is received in the second guide recess (85) in a linearly movable manner and wherein a coupling rocker (106), which rests with a first end region (107) on a first end face (101) of the first actuating plunger (93) facing away from the valve membrane (65) and which rests with a second end region (108) on a second end face (102) of the second actuating plunger (94) facing away from the valve membrane (65), is pivotally mounted on the valve housing (3), and wherein a drive device (10) is arranged in the valve housing (3),which is designed to initiate a linear drive movement on the first end region (107) or the second end region (108) of the coupling rocker (106). [8] Diaphragm valve according to claim 7, characterized by that a return spring (99, 100) is assigned to the first and / or the second actuating plunger (93, 94) in order to determine a preferred position for the first or second actuating plunger (93, 94) arranged remote from the first or second valve seat (47, 48) and / or that the drive device (10) is designed as a solenoid drive.

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