JP2007113764A - Diaphragm type control valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a diaphragm type control valve advantageous to making compact. <P>SOLUTION: A plunger 3 has a first clamping surface 71 facing one side of an inner peripheral part 44 of a diaphragm 4. A valve element 2 has a second clamping surface 72 facing the other side of the inner peripheral part 44 of the diaphragm 4. A body 1 has a holder member 8 having an inner diameter smaller than the outer diameter of the plunger 3 and having a third clamping surface 73 facing the one side in the thickness direction of an outer peripheral part 43 of the diaphragm 4, and a fourth clamping surface 74 facing the other side in the thickness direction of the outer peripheral part 43 of the diaphragm 4 facing the holder member 8. The inner peripheral part 44 of the diaphragm 4 is clamped by the first clamping surface 71 of the plunger 3 and the second clamping surface 72 of the valve element 2. The outer peripheral part 43 of the diaphragm 4 is clamped by the third clamping surface 73 of the holder member 8 and the fourth clamping surface 74 of the body 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a diaphragm type control valve having a diaphragm.

  Conventionally, Patent Document 1 discloses a body having a chamber and a valve port, a valve body that closes and opens the valve port, a plunger that holds the valve body, and a fluid passage chamber that can communicate with the valve port. A diaphragm type electromagnetic valve having a diaphragm to be isolated, an urging member, and an electromagnetic solenoid part for moving a plunger is disclosed.

In Patent Document 2, a body having a chamber and a valve port, a valve body that closes and opens the valve port, a plunger that holds the valve body, and a fluid passage chamber that can communicate with the valve port are isolated. A diaphragm-type solenoid valve having a diaphragm that moves and a solenoid solenoid that moves a plunger is disclosed.
JP 2001-227671 A JP 2004-179118 A

  According to the electromagnetic valve according to Patent Document 1 described above, the inner diameter of the inner wall surface that defines the fluid passage chamber isolated by the diaphragm is set larger than the outer diameter of the plunger. Accordingly, the outer peripheral portion of the diaphragm is fixed to the body at a position having a diameter larger than the outer diameter of the plunger. For this reason, it is necessary to make the outer diameter of the pressure receiving portion of the diaphragm larger than the outer diameter of the plunger, which inevitably increases the outer diameter of the pressure receiving portion of the diaphragm. In this case, the pressure receiving pressure that the pressure receiving portion of the diaphragm receives from the gas in the gas passage chamber increases. As a result, it is necessary to increase the urging force of the urging member. For this reason, the drive elements, such as an electromagnetic solenoid part which exhibits the force which operates a valve body against a biasing member, are enlarged. As a result, the size of the solenoid valve is increased.

  According to the electromagnetic valve according to Patent Document 2 described above, the plunger and the valve body are connected to each other with a thin shaft at a distance in the axial length direction. Furthermore, the plunger moves along the axial length direction when power is supplied to the exciting coil of the electromagnetic solenoid unit, but the moving direction of the plunger is opposite to the case of Patent Document 1. Therefore, when opening the valve body, it is necessary to move the plunger so that the plunger moves away from the electromagnetic solenoid portion. For this reason, a large space is required in the axial length direction of the electromagnetic solenoid portion as the driving element. Therefore, there has been a problem that the solenoid valve becomes larger in the axial direction.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a control valve that is advantageous for downsizing.

(1) A diaphragm type control valve according to aspect 1 includes: (a) a body having a chamber and a valve opening; a valve element that closes and opens the valve opening; a plunger that holds the valve element; In a diaphragm type control valve comprising a diaphragm having a pressure receiving part and partitioning a chamber into a fluid passage chamber and a sub chamber that sometimes communicate with the valve port,
(B) The plunger has a first clamping surface facing one surface in the thickness direction of the inner peripheral portion of the diaphragm, and the valve body has a second clamping surface facing the other surface in the thickness direction of the inner peripheral portion of the diaphragm. ,
(C) The body has a holder member having an inner diameter smaller than the outer diameter of the plunger and having a third clamping surface facing one surface in the thickness direction of the outer peripheral portion of the diaphragm, and an outer peripheral portion of the diaphragm facing the holder member Having a fourth clamping surface facing the other surface in the thickness direction,
(D) The inner peripheral part of the diaphragm is clamped in the thickness direction by the first clamping surface of the plunger and the second clamping surface of the valve body, and the outer peripheral part of the diaphragm is the third clamping surface of the holder member and the body The fourth clamping surface is sandwiched in the thickness direction.

  According to the aspect 1, the valve body is held at the distal end portion of the plunger, and the inner peripheral portion of the diaphragm is sandwiched between the first clamping surface of the plunger and the second clamping surface of the valve body in the thickness direction. Has been. That is, the plunger and the valve body are close to each other. For this reason, an extra space is saved in the axial direction of the plunger, and the length of the diaphragm type control valve in the axial direction can be suppressed. Furthermore, the holder member which has the 3rd clamping surface which faces the one surface of the thickness direction of the outer peripheral part of a diaphragm is provided. Since the inner diameter of the holder member is made smaller than the outer diameter of the plunger, the outer diameter of the pressure receiving portion of the diaphragm held by the holder member can be made smaller than the outer diameter of the plunger. For this reason, the diameter of the pressure receiving portion of the diaphragm can be reduced, and the pressure receiving area of the pressure receiving portion of the diaphragm can be reduced.

  (2) According to the diaphragm control valve according to aspect 2, the urging member that urges the plunger in the valve closing direction or the valve opening direction, and the drive that operates the valve body against the urging force of the urging member Elements are provided. Examples of the driving element include an electromagnetic solenoid unit and a motor. The electromagnetic solenoid unit is a unit that forms an magnetic force by applying an exciting current to the exciting coil and operates the valve body based on the magnetic force. The motor includes a stepping motor.

  When the fluid is supplied to the fluid passage chamber, the pressure of the fluid in the fluid passage chamber is received by the pressure receiving portion of the diaphragm. Due to the pressure received by the diaphragm, a load acts on the plunger along the axial length direction of the plunger. In order to ensure the valve closing or opening of the valve body, an urging member having an urging force that opposes the pressure receiving force acting on the pressure receiving portion of the diaphragm is required. And in the case of the type that the control valve is normally closed and opened by energization, when opening the valve body, the drive element such as the electromagnetic solenoid part and the motor is operated to operate the valve body together with the plunger, Open the valve. In the case of a type in which the control valve is normally open and is closed by energization, when closing the valve body, the drive element such as an electromagnetic solenoid unit or a motor is operated to operate the valve body together with the plunger. Close the disc. At this time, it is necessary to make the force generated by the driving element such as the electromagnetic solenoid unit and the motor larger than the urging force of the urging member.

  In this sense, if the pressure receiving area of the diaphragm is large and the pressure receiving force received by the diaphragm pressure receiving portion is large, the urging force of the urging member increases, and the driving element such as an electromagnetic solenoid portion or a motor that resists the urging member Increase in size. Therefore, in order to reduce the size of the diaphragm type control valve, it is preferable to make the outer diameter of the pressure receiving portion of the diaphragm as small as possible.

  According to this aspect 2, as described above, since the inner diameter of the holder member that holds the outer peripheral portion of the diaphragm is made smaller than the outer diameter of the plunger, the outer diameter of the pressure receiving portion of the diaphragm is set outside the plunger. It can be made smaller than the diameter. For this reason, the diameter of the pressure receiving portion of the diaphragm can be reduced, and the pressure receiving area of the pressure receiving portion of the diaphragm can be reduced. Therefore, it is possible to contribute to downsizing of the urging member and downsizing of the electromagnetic solenoid part, the motor, and the like. As a result, it can contribute to miniaturization of the control valve.

  (3) According to the diaphragm type control valve according to aspect 3, not only the inner diameter of the holder member is made smaller than the outer diameter of the plunger, but also the outer diameter of the pressure receiving portion of the diaphragm is set smaller than the outer diameter of the plunger. Has been. For this reason, the outer diameter of the pressure receiving part of the diaphragm is reduced. Therefore, it is possible to contribute to downsizing of the urging member and downsizing of driving elements such as an electromagnetic solenoid unit and a motor. As a result, it can contribute to miniaturization of the control valve.

  (4) According to the diaphragm control valve according to aspect 4, the inner diameter of the inner wall surface forming the fluid passage chamber is set smaller than the outer diameter of the plunger. This is advantageous for reducing the outer diameter of the pressure receiving portion of the diaphragm. Therefore, it is possible to contribute to the downsizing of the urging member and the electromagnetic solenoid unit. As a result, it can contribute to miniaturization of the control valve.

  (5) According to the diaphragm type control valve according to aspect 5, the plunger has a fitting portion that is one of the concave portion and the convex portion, and the valve body is the other of the concave portion and the convex portion. The valve body is assembled | attached to the plunger by fitting with the fitting part of a plunger, and the to-be-fitted part of a valve body. In this case, it is advantageous to directly clamp the inner peripheral portion of the diaphragm between the first clamping surface of the plunger and the second clamping surface of the valve body. Therefore, it is advantageous to reduce the size of the control valve in the axial direction of the plunger.

  (6) According to the aspect 6, the fitting portion of the plunger has a stopper surface, and the fitted portion of the valve body has a stoppered surface that faces the stopper surface. The positioning of the valve body with respect to the plunger is set by the contact between the stopper surface and the stopper surface. Therefore, the tightening allowance of the inner periphery of the diaphragm is defined. In this case, since the stopper surface and the stopper surface are in contact with each other, it is advantageous to make the clamping force for clamping the inner peripheral portion of the diaphragm constant. Therefore, excessive tightening allowance of the inner peripheral portion is suppressed, and the durability of the inner peripheral portion is improved.

  (7) According to aspect 7, the portion of the body that holds the holder member has the second stopper surface, and the holder member abuts against the second stopper surface, whereby the tightening margin of the outer peripheral portion of the diaphragm is defined. ing. In this case, it is advantageous to make the holding force for holding the outer peripheral portion of the diaphragm constant. Therefore, excessive tightening allowance of the outer peripheral portion is suppressed, and the durability of the outer peripheral portion is improved.

  (8) According to the aspect 8, the pressure member is interposed between the drive element such as the electromagnetic solenoid unit and the holder member, and the holder member is held by the body via the pressure member. In this case, the holder member does not have to be pressed into the body and fixed. Therefore, the work for assembling the holder member is facilitated. The pressure member is interposed between the drive element and the holder member, and holds the holder member on the body. The pressure member may be ring-shaped or non-ring-shaped. The material is not particularly limited.

  (9) According to aspect 9, the fuel supply path for supplying the fuel fluid to the fuel cell stack, the oxidant supply path for supplying the oxidant fluid to the fuel cell stack, and the fuel for discharging the fuel off fluid from the fuel cell stack Of the fuel cell power generation system including a discharge path and an oxidant discharge path for discharging the oxidant off-fluid from the fuel cell stack, the diaphragm type control valve is used for at least one of the fuel discharge path and the oxidant discharge path. It is done. Since this diaphragm type control valve can be downsized, it can contribute to downsizing of the fuel cell power generation system.

  According to the present invention, the inner peripheral portion of the diaphragm is clamped between the first clamping surface of the plunger and the second clamping surface of the valve element. For this reason, an extra space is saved in the axial direction of the plunger, and the length of the diaphragm type control valve in the axial direction can be suppressed. Furthermore, the holder member which has the 3rd clamping surface which faces the one surface of the thickness direction of the outer peripheral part of a diaphragm is provided. The inner diameter of the holder member is made smaller than the outer diameter of the plunger. For this reason, the outer diameter of the pressure receiving part of the diaphragm held by the holder member can be made smaller than the outer diameter of the plunger. For this reason, the diameter of the pressure receiving portion of the diaphragm can be reduced, and the pressure receiving area of the pressure receiving portion of the diaphragm can be reduced. As a result, the pressure received by the pressure receiving portion of the diaphragm from the fluid (for example, gas) in the fluid passage can be reduced. Therefore, it is advantageous for downsizing the diaphragm type control valve.

(Embodiment 1)
Embodiment 1 of the present invention will be described below with reference to FIGS. FIG. 1 shows a cross section of a diaphragm type control valve. FIG. 2 shows the main part. FIG. 3 shows the holder member 8, the diaphragm 4 and the body 1 in an exploded manner. FIG. 4 shows the dimensional relationship of the main part. In FIG. 4, hatching is omitted to avoid complication. The diaphragm type control valve is disposed in a gas flow path through which a gas (fluid) that may contain a liquid component or vapor flows. As shown in FIG. 1, the diaphragm control valve includes a body 1, a valve body 2, a plunger 3, and a flexible diaphragm 4 that forms a film. Further, the diaphragm type control valve includes an urging member 5 and an electromagnetic solenoid unit 6 as a driving element.

  As shown in FIG. 1, the body 1 has a hollow chamber 10, a valve port 11, and a valve seat 12. The valve seat 12 bulges toward the valve body 2 (upward). The valve port 11 is partitioned by a valve seat 12. In order to improve drainage, the valve seat 12 is provided on the lower side of a gas passage chamber 13 (fluid passage chamber) described later.

  A gas supply unit 15 is provided upstream of the valve port 11. A gas discharge unit 16 is provided downstream of the valve port 11. The valve body 2 is disposed in the gas passage chamber 13. A predetermined amount of space for preventing freezing is formed between the outer diameter of the valve body 2 and the inner wall surface 13 f of the gas passage chamber 13 of the body 1. The valve body 2 has a concave fitted portion 20 having a stoppered surface 21. A seal member 22 for sealing the valve port 11 is held at the tip of the valve body 2.

  As shown in FIG. 3, the diaphragm 4 includes a pressure receiving portion 41, a central hole 42 penetrating in the thickness direction, an outer peripheral portion 43 that forms the outer periphery of the diaphragm 4, and an inner peripheral portion 44 that forms the inner periphery of the diaphragm 4. And have. The pressure receiving portion 41 has a convolution portion that has a wave shape in order to secure the deformation amount of the diaphragm 4. The outer peripheral portion 43 of the diaphragm 4 is thick in order to secure a tightening margin and improve the sealing performance. The inner peripheral portion 44 of the diaphragm 4 is made thick so as to secure a tightening margin and improve a sealing property.

  As shown in FIG. 1, the diaphragm 4 partitions the chamber 10 of the body 1 into a gas passage chamber 13 and a sub chamber 14. The gas passage chamber 13 is disposed below the sub chamber 14. The sub chamber 14 communicates with the atmosphere. The diaphragm 4 isolates the gas passage chamber 13 from the sub chamber 14 so that the liquid does not enter the sub chamber 14 when the gas flowing into the gas passage chamber 13 contains a liquid (for example, moisture). It is preferable that the diaphragm 4 is provided with a barrier layer by burying or the like. The barrier layer has high gas barrier properties and liquid barrier properties. Thereby, the prevention of mixing of gas and liquid between the gas passage chamber 13 and the sub chamber 14 is high. The upstream passage 13 u communicating with the gas passage chamber 13 is connected to the gas supply unit 15. A downstream passage 13 d communicating with the gas passage chamber 13 is connected to the gas discharge unit 16. A valve port 11 is formed on the bottom surface of the gas passage chamber 13.

  The plunger 3 is made of a material that can transmit magnetic flux. As shown in FIG. 1, the plunger 3 includes a main body portion 30 that occupies a majority volume of the plunger 3, a medium diameter portion 31 that extends coaxially at the tip of the main body portion 30, and a medium diameter portion 31. And a small-diameter fitting portion 32 extending coaxially at the distal end portion. Here, the axis P1 of the plunger 3 is along the vertical direction. The fitting portion 32 is located on the distal end side of the plunger 3. The fitting portion 32 of the plunger 3 is inserted into the central hole 42 of the diaphragm 4.

  As shown in FIG. 2, the shaft end surface at the tip of the fitting portion 32 of the plunger 3 is a stopper surface 33. The fitting portion 32 of the plunger 3 is fitted into the concave fitting portion 20 of the valve body 2 by press fitting. Thereby, the plunger 3 and the valve body 2 are assembled | attached integrally.

  As shown in FIG. 1, the urging member 5 is a coil spring arranged coaxially with the axis P1 of the plunger 3, and has an urging force that urges the plunger 3 in the valve closing direction (arrow Y1 direction). . The biasing member 5 is disposed in a spring accommodating chamber 36 formed in the main body 30 of the plunger 3. The electromagnetic solenoid unit 6 is assembled to the body 1. The electromagnetic solenoid unit 6 generates a valve opening force (force in the arrow Y2 direction) by energization against the urging force of the urging member 5 that urges in the valve closing direction (arrow Y1 direction).

  As shown in FIG. 1, the electromagnetic solenoid portion 6 includes a ring-shaped plate 60 having an inner peripheral surface 60 i facing the outer peripheral surface of the main body portion 30 of the plunger 3, and a cylindrical shape assembled on the upper side of the plate 60. A housing 61, a cylindrical bobbin 62 formed of an electrical insulating material built in the housing 61, an excitation coil 63 wound around the outer peripheral surface of the bobbin 62 in a ring shape, and an outer peripheral side of the excitation coil 63 And a cylindrical yoke 64 that forms a magnetic path, and a fixed core 65 provided inside the yoke 64. In the space defined by the inner peripheral surface of the bobbin 62, the plunger 3 is movable along the directions of arrows Y1 and Y2.

  The fixed core 65 is disposed inside the exciting coil 63 and is disposed above the plunger 3 so that the plunger 3 can be sucked. The plunger 3 is set between the fixed core 65 and the valve body 2. That is, the fixed core 65 is disposed on the opposite side to the valve body 2 with respect to the plunger 3. The yoke 64 holds the fixed core 65 by press fitting or the like. As shown in FIG. 1, the plunger 3, the biasing member 5, and the fixed core 65 are disposed above the valve port 11. Therefore, the plunger 3, the urging member 5 and the fixed core 65 (electromagnetic solenoid part 6) are arranged on the same side with respect to the valve port 11.

  In use, when an exciting current is passed through the exciting coil 63, a magnetic field is generated and the fixed core 65 is excited. Then, the plunger 3 is sucked by the fixed core 65 and moved in the valve opening direction (arrow Y2 direction), the valve body 2 connected to the plunger 3 moves in the valve opening direction, and is separated from the valve seat 12, The valve port 11 is opened. In this case, although depending on the type of the control valve, the distance at which the valve body 2 is separated from the top of the valve seat 12 is, for example, 0.5 mm or less, 1 mm or less, or 2 mm or less.

  When the valve port 11 is opened as described above, the gas in the gas supply unit 15 flows in the order of the upstream passage 13u → the gas passage chamber 13 → the valve port 11 → the downstream passage 13d → the gas discharge unit 16 of the body 1. In this case, the plunger 3 forms a magnetic path.

  When the valve body 2 is opened, the gas pressure in the gas passage chamber 13 acts on the pressure receiving portion 41 of the diaphragm 4 in the direction in which the valve body 2 is opened (in the direction of the arrow Y2). When the exciting coil 63 is turned off, the plunger 3 is pressed in the valve closing direction (arrow Y1 direction) by the urging force of the urging member 5, the valve body 2 is seated on the valve seat 12, and the valve port 11 is moved. Closed. Therefore, this control valve is closed when the excitation coil 63 is disconnected, and is opened when the excitation coil 63 is energized. Even when the valve body 2 is opened, the gas pressure in the gas passage chamber 13 acts on the pressure receiving portion 41 of the diaphragm 4 in the direction in which the valve body 2 is opened (arrow Y2 direction).

  As shown in FIG. 2, the intermediate diameter portion 31 of the plunger 3 has a ring-shaped first clamping surface 71 that faces one surface of the inner peripheral portion 44 of the diaphragm 4. The upper shaft end surface of the valve body 2 is a ring-shaped second clamping surface 72 that faces the other surface of the inner peripheral portion 44 of the diaphragm 4. The inner peripheral portion 44 of the diaphragm 4 is clamped in the thickness direction by the first clamping surface 71 of the plunger 3 and the second clamping surface 72 of the valve body 2. The first clamping surface 71 and the second clamping surface 72 are flat.

  Here, as shown in FIG. 2, the stopper surface 33 of the fitting portion 32 of the plunger 3 is in contact with the stoppered surface 21 of the concave fitting portion 20 of the valve body 2. Accordingly, the valve body 2 is positioned with respect to the plunger 3 in the axial length direction of the plunger 3. As a result, the amount of interference in the thickness direction of the inner peripheral portion 44 of the diaphragm 4, that is, the clamping force of the inner peripheral portion 44 is made constant. Therefore, it is advantageous in improving the durability and sealing performance of the inner peripheral portion 44 of the diaphragm 4.

  As shown in FIG. 3, a ring-shaped holder member 8 is attached to the body 1. The holder member 8 includes a relatively thick first holder portion 81, a second holder portion 82 that is thinner than the first holder portion 81, a first holder portion 81, and a second holder portion 82. And a step 83 serving as a boundary. The first holder portion 81 is located on the outer peripheral side of the holder member 8. The second holder portion 82 is located on the inner peripheral side of the holder member 8. The thickness t1 (see FIG. 3) of the first holder part 81 on the press-fitting side is thicker than the thickness t2 of the second holder part 82. For this reason, the strength and rigidity of the holder member 8 are ensured. The material of the holder member 8 is not particularly limited, and metals, hard resins, and ceramics can be employed.

  The surface 82x that is the upper surface of the second holder portion 82 is retracted by Δt (see FIG. 1) in a direction closer to the valve opening 11 than the surface 81x that is the upper surface of the first holder portion 81. Thereby, the plunger 3 can approach the holder member 8, and can further contribute to size reduction in the axial length direction of the control valve. As shown in FIG. 3, the inner peripheral surface 8 i of the holder member 8 forms a central hole 86. The inner peripheral surface 8 i is an arc surface that protrudes in an arc shape toward the center of the holder member 8. Thereby, since the inner peripheral surface 8i of the holder member 8 touches the diaphragm 4 smoothly, damage to the diaphragm 4 is suppressed. The fitting portion 32 of the plunger 3 is inserted into the central hole 86 of the diaphragm 8.

  FIG. 4 shows the dimensional relationship. As shown in FIG. 4, the outer diameter of the main body 30 of the plunger 3 is indicated as D1. The outer diameter of the middle diameter portion 31 of the plunger 3 is indicated as D2. The outer diameter D2 is smaller than the outer diameter of the valve body 2. The outer diameter of the fitting part 32 of the plunger 3 is shown as D3. The inner diameter of the inner wall surface 13f that forms the gas passage chamber 13 is indicated as D0. The outer diameter of the outer peripheral portion 43 of the diaphragm 4 is indicated as Dp. The inner diameter of the inner peripheral portion 44 of the diaphragm 4 is indicated as Di (Di≈D3, Di = D3). The outer diameter of the pressure receiving portion 41 of the diaphragm 4 is indicated as Dm. Furthermore, as shown in FIG. 4, the outer diameter of the holder member 8 is shown as D4. The inner diameter of the holder member 8 is shown as D5 (D5≈Dm, D5 = Dm). The inner diameter of the first holder portion 81 of the holder member 8 is indicated as D6. Furthermore, the inner diameter D5 of the holder member 8 is set smaller than the outer diameter D1 of the plunger 3 (D5 <D1). The inner diameter D5 of the holder member 8 is basically the same as the inner diameter D0 of the inner wall surface 13f that forms the gas passage chamber 13. .

  As shown in FIG. 4, the inner diameter D6 of the first holder portion 81 of the holder member 8 is set to be slightly larger than the outer diameter D1 of the plunger 3 (D1 <D6). Since D1 <D6, the main body portion 30 of the plunger 3 can approach the surface 82x of the second holder portion 82 of the holder member 8 in the axial length direction thereof. Thereby, the plunger 3 can approach the holder member 8, and can contribute further to size reduction of the axial length direction of the control valve. The outer diameter D4 of the holder member 8 is set larger than the outer diameter D1 of the main body 30 of the plunger 3 (D4> D1). Since the outer diameter D4 of the holder member 8 is thus increased, the holding area is increased, which is advantageous in securing a holding force for holding the holder member 8 on the body 1.

  As shown in FIG. 3, the holder member 8 has a flat third clamping surface 73. The third clamping surface 73 has a ring shape and faces one surface in the thickness direction of the outer peripheral portion 43 of the diaphragm 4. As shown in FIG. 3, the body 1 has an engagement step portion 18 a that forms a ring shape that engages and holds the holder member 8, and a ring shape that is provided on the inner peripheral side of the engagement step portion 18 a. Engaging step 18b. The engagement step portion 18a includes a ring-shaped engagement surface 19 serving as an inner peripheral surface. The engagement step portion 18 b includes a flat fourth clamping surface 74. The fourth clamping surface 74 faces the other surface in the thickness direction of the outer peripheral portion 43 of the diaphragm 4. On the inner peripheral side of the fourth clamping surface 74, a ring-shaped convex portion 74x is formed upward. The convex portion 74x is advantageous for inclining the cross-sectional shape of the pressure receiving portion 41 of the diaphragm 4 upward. The top surface 74 y of the convex portion 74 x is rounded so as to suppress damage to the diaphragm 4.

  Here, the holder member 8 is press-fitted and fixed to the ring-shaped engagement surface 19 of the engagement step portion 18a. As a result of fixing the holder member 8 as described above, the outer peripheral portion 43 of the diaphragm 4 is sandwiched between the third clamping surface 73 of the holder member 8 and the fourth clamping surface 74 of the body 1 in the thickness direction. When the holder member 8 is fixed to the body 1 as described above, a gap 8k is formed between the holder member 8 and the plate 60 as shown in FIG. Further, the third clamping surface 73 of the holder member 8 abuts on the second stopper surface 18m which is the bottom surface of the engagement step portion 18a of the body 1. For this reason, the third clamping surface 73 of the holder member 8 is positioned in the axial length direction of the plunger 3. As a result, the tightening margin in the thickness direction of the outer peripheral portion 43 of the diaphragm 4 can be made constant, which can contribute to securing the sealing performance and the life of the outer peripheral portion 43.

  According to the present embodiment, as shown in FIG. 2, the inner peripheral portion 44 of the diaphragm 4 is directly sandwiched between the first sandwiching surface 71 of the plunger 3 and the second sandwiching surface 72 of the valve body 2. Yes. For this reason, an extra space is saved in the axial direction of the plunger 3. Accordingly, the axial length of the diaphragm control valve can be suppressed. Furthermore, a holder member 8 having a third clamping surface 73 facing one surface in the thickness direction of the outer peripheral portion 43 of the diaphragm 4 is provided. The inner diameter D5 of the holder member 8 is made smaller than the outer diameter D1 of the main body 30 of the plunger 3. For this reason, the outer diameter Dm of the pressure receiving portion 41 of the diaphragm 4 can be set smaller than the outer diameter D1 of the main body portion 30 of the plunger 3. Therefore, the diameter of the pressure receiving portion 41 of the diaphragm 4 can be reduced, and the pressure receiving area of the pressure receiving portion 41 of the diaphragm 4 can be reduced.

  Here, when gas is supplied to the gas passage chamber 13, the gas pressure in the gas passage chamber 13 is received by the pressure receiving portion 41 of the diaphragm 4. This received pressure acts in the direction (arrow Y2 direction) in which the valve body 2 is opened. Therefore, due to the pressure receiving force, a load acts on the plunger 3 along the axial direction of the plunger 3 in the valve opening direction (arrow Y2 direction). Here, in order to ensure the valve closing performance of the valve body 2, the urging member 5 having an urging force that acts in the valve closing direction (arrow Y1 direction) so as to oppose the pressure received by the diaphragm 4. Is needed. And when opening the valve body 2, the electromagnetic solenoid part 6 is operated, valve opening force is generated, the plunger 3 is moved to the valve opening direction (arrow Y2 direction), and the valve body 2 is opened. At this time, the valve opening force generated in the electromagnetic solenoid unit 6 must overcome the urging force of the urging member 5. In this sense, if the pressure receiving area of the pressure receiving portion 41 of the diaphragm 4 is large and the pressure receiving pressure of the diaphragm 4 is large, the urging force of the urging member 5 in the valve closing direction becomes large, and a valve opening force is generated that opposes this. The electromagnetic solenoid unit 6 is increased in size. Therefore, in order to reduce the size of the diaphragm type control valve, it is preferable to make the outer diameter of the pressure receiving portion 41 of the diaphragm 4 as small as possible.

  In this regard, according to the present embodiment, as described above, the inner diameter D5 of the holder member 8 is set smaller than the outer diameter D1 of the main body portion 30 of the plunger 3, and accordingly, the pressure receiving portion 41 of the diaphragm 4 The outer diameter Dm is set smaller than the outer diameter D1 of the plunger 3. As a result, the diameter of the pressure receiving portion 41 of the diaphragm 4 can be reduced. Further, according to the present embodiment, the inner diameter D0 of the inner wall surface 13f forming the gas passage chamber 13 of the body 1 is set smaller than the outer diameter D1 of the plunger 3 (D0 <D1). And the outer peripheral part 43 of the diaphragm 4 is clamped using the holder member 8 arrange | positioned on the outer side of the gas passage chamber 13. As a result, it is advantageous to further reduce the outer diameter Dm of the pressure receiving portion 41 of the diaphragm 4. Thus, according to this embodiment, since the outer diameter Dm of the pressure receiving part 41 of the diaphragm 4 can be reduced, the urging force of the urging member 5 that resists the receiving pressure can be reduced. As a result, the electromagnetic solenoid part 6 resisting the urging force of the urging member 5 can be reduced in size. Therefore, the diaphragm type control valve can be downsized as a whole.

(Embodiment 2)
FIG. 5 shows Embodiment 2 of the present invention. This embodiment has basically the same configuration and the same operation and effect as the first embodiment. Hereinafter, a description will be given centering on differences from the first embodiment. A concave fitting portion 32 </ b> B is formed at the distal end portion of the plunger 3. The valve body 2 has a convex fitted portion 20B. The valve body 2 is integrally assembled to the plunger 3 by press-fitting (fitting) the concave fitting portion 32B of the plunger 3 and the convex fitted portion 20B of the valve body 2. Also in the present embodiment, the stopper surface 33 of the fitting portion 32B of the plunger 3 is in contact with the stopper surface 21 of the convex fitting portion 20B of the valve body 2. Thereby, the valve body 2 is positioned with respect to the plunger 3 in the axial length direction of the plunger 3. As a result, the tightening amount of the inner peripheral portion 44 of the diaphragm 4, that is, the clamping force is made constant. Therefore, it is advantageous for improving the durability of the inner peripheral portion 44 of the diaphragm 4.

(Embodiment 3)
FIG. 6 shows Embodiment 3 of the present invention. This embodiment has basically the same configuration and the same operation and effect as the first embodiment. Hereinafter, a description will be given centering on differences from the first embodiment. The body 1 has ring-shaped engagement step portions 18 a and 18 b that engage and hold the ring-shaped holder member 8. The engagement step portion 18 a has a ring-shaped engagement surface 19. The engagement step portion 18 b includes a ring-shaped flat fourth clamping surface 74. Here, the holder member 8 is fitted in the engagement surface 19 of the engagement step portion 18a in a non-press-fit state.

  In the present embodiment, as shown in FIG. 6, a pressure plate 69 as a pressure member is interposed between the plate 60 serving as the bottom of the electromagnetic solenoid unit 6 and the holder member 8. The holder member 8 is held on the body 1 via the pressure plate 69. Here, the electromagnetic solenoid part 6 having the plate 60 is fixed to the body 1 by an unillustrated fixture (for example, a bolt member). The electromagnetic solenoid unit 6 is located on the upper side of the body 1. When the electromagnetic solenoid unit 6 is fixed to the body 1, the thickness of the pressure plate 69 pressurized by the plate 60 is reduced, and the holder member 8 is pressed in the thickness direction thereof. As a result, the holder member 8 is fixed to the body 1. Thereby, the outer peripheral part 43 of the diaphragm 4 is clamped in the thickness direction. The pressure plate 69 may be formed of an elastic material such as a rubber material or a porous body so that a pressing force can be exerted in the thickness direction of the pressure plate 69, Alternatively, a corrugated plate structure may be used, or a spring element such as a disc spring may be used.

  According to the present embodiment, the holder member 8 does not need to be press-fitted into the engagement surface 19 of the engagement step portion 18a of the body 1, so that the assembling work of the holder member 8 becomes easy.

(Embodiment 4)
FIG. 7 shows a fourth embodiment of the present invention. This embodiment basically has the same configuration and the same function and effect as the first to third embodiments. Hereinafter, a description will be given centering on differences from the first to third embodiments. This embodiment is applied to a fuel gas supply system of a fuel cell power generation system. The fuel cell power generation system according to the embodiment shown in FIG. 7A includes a fuel cell stack 300 having a plurality of fuel cells, and a supply path 302 (fuel supply path) for supplying fuel gas to the gas inlet 301 of the fuel cell stack 300. A discharge path 304 (fuel discharge path) for discharging off-gas (fuel off fluid) from the gas outlet 303 of the fuel cell stack 300, a fuel source 305 provided upstream of the supply path 302, and a fuel cell in the supply path 302 It has a gas supply valve 306 provided on the gas inlet 301 side of the stack and a first gas discharge valve 307 provided on the gas outlet 303 side of the fuel cell stack 300 in the discharge path 304.

  As shown in FIG. 7A, an oxidant gas supply path 402 (oxidant supply path) for supplying an oxidant gas to the oxidant gas inlet 401 of the fuel cell stack 300, and an oxidant outlet 403 of the fuel cell stack 300. An oxidant gas discharge path 404 (oxidant discharge path) is provided for discharging the oxidant off gas (oxidant off fluid) from the gas. The off-fluid means a gas that has undergone a power generation reaction.

  In the fuel cell power generation system according to the embodiment shown in FIG. 7B, a return path 310 that connects the discharge path 304 and the intermediate portion of the supply path 302 is provided. The return path 310 returns the off gas to an intermediate portion of the supply path 302 and has a return valve 311 that can be opened and closed. Further, the discharge passage 304 has a second gas discharge valve 308. The off gas discharged from the gas outlet 303 of the fuel cell stack 300 may contain fuel. For this reason, the off-gas is returned to the intermediate portion of the supply path 302 via the return path 310 and supplied again to the gas inlet 301 of the fuel cell stack 300 at all times or as necessary. In some cases, the feedback valve 311 can be eliminated in the return path 310.

  In each embodiment described above, at least one of the first gas discharge valve 307, the second gas discharge valve 308, and the feedback valve 311 can be formed by the control valve according to the above-described first to third embodiments. In this case, since the diameter of the diaphragm 4 is reduced as described above, the control valve can be reduced in size. Therefore, it is possible to reduce the size of the fuel cell power generation system.

  In addition, although this embodiment is used for the control valve through which fuel gas flows, it is not limited to this, and may be used for a control valve attached to an oxidant gas system through which oxidant gas such as air flows. The fuel cell power generation system described above is applied to in-vehicle use or stationary use.

(Other embodiments)
Although the electromagnetic solenoid unit 6 is used as a driving element, a motor such as a stepping motor may be used. The present invention is not limited to a fuel cell power generation system, but can be applied to other gas systems such as a cogeneration system using gas. In addition, the present invention is not limited to the embodiment described above and shown in the drawings, and can be implemented with appropriate modifications without departing from the scope of the invention.

  The present invention can be used in gas systems such as fuel cell power generation systems and cogeneration systems.

2 is a cross-sectional view of a control valve according to Embodiment 1. FIG. FIG. 3 is a cross-sectional view of a main part of the control valve according to Embodiment 1. FIG. 3 is a cross-sectional view of a main part of the control valve according to Embodiment 1. 3 is an enlarged cross-sectional view of a main part of the control valve according to Embodiment 1. FIG. It is sectional drawing of the control valve which concerns on Embodiment 2. FIG. It is sectional drawing of the control valve which concerns on Embodiment 3. (A) and (b) are system diagrams of a fuel cell power generation system according to another example of Embodiment 4, respectively.

Explanation of symbols

  1 is a body, 10 is a chamber, 11 is a valve port, 13 is a gas passage chamber, 18m is a second stopper surface, 2 is a valve body, 20 is a fitted portion, 21 is a stoppered surface, 3 is a plunger, 30 Is a body part, 32 is a fitting part, 33 is a stopper surface, 4 is a diaphragm, 41 is a pressure receiving part, 42 is a central hole, 43 is an outer peripheral part, 44 is an inner peripheral part, 6 is an electromagnetic solenoid part (driving element), 69 is a pressure plate (pressure member), 71 is a first clamping surface, 72 is a second clamping surface, 73 is a third clamping surface, 74 is a fourth clamping surface, 8 is a holder member, 300 is a fuel cell stack, Reference numeral 302 denotes a supply path (fuel supply path), 304 denotes a discharge path (fuel discharge path), 306 denotes a gas supply valve, and 307 denotes a first gas discharge valve.

Claims (8)

(A) a body having a chamber and a valve port; a valve body that closes and opens the valve port; a plunger that holds the valve body; and a fluid passage chamber that can communicate with the valve port when the valve is opened In the diaphragm type control valve comprising a diaphragm having a pressure receiving portion and partitioning the chamber into a sub chamber and a sub chamber,
(B) The plunger has a first clamping surface that faces one surface in the thickness direction of the inner peripheral portion of the diaphragm, and the valve body faces the other one surface in the thickness direction of the inner peripheral portion of the diaphragm. It has a clamping surface,
(C) The body has a holder member having an inner diameter smaller than the outer diameter of the plunger and having a third clamping surface facing one surface in the thickness direction of the outer peripheral part of the diaphragm, and the thickness of the outer peripheral part of the diaphragm With a fourth clamping surface facing the other side of the direction,
(D) The inner peripheral portion of the diaphragm is sandwiched in the thickness direction between the first sandwiching surface of the plunger and the second sandwiching surface of the valve body, and the outer peripheral portion of the diaphragm is the holder member A diaphragm-type control valve, wherein the third clamping surface and the fourth clamping surface of the body are clamped in the thickness direction.   The biasing member that biases the plunger in the valve closing direction or the valve opening direction, and a drive element that exerts a force that operates the valve body against the biasing force of the biasing member. A diaphragm type control valve provided.   3. The diaphragm control valve according to claim 1, wherein an inner diameter of an inner wall surface forming the fluid passage chamber of the body is set smaller than an outer diameter of the plunger.   In any one of Claims 1-3, the said plunger has the fitting part which consists of one of a recessed part and a convex part, and the said valve body is a recessed part and a convex part. It has a fitted part consisting of the other, and the valve body is assembled to the plunger by fitting the fitting part of the plunger and the fitted part of the valve body. Diaphragm type control valve characterized by   The said fitting part of the said plunger has a stopper surface in Claim 4, The said to-be-fitted part of the said valve body has a to-be-stopped surface which faces the said stopper surface, The said stopper surface, The diaphragm type control valve, wherein positioning of the valve body with respect to the plunger is set by contact with the stopper surface, and a tightening margin of an inner peripheral portion of the diaphragm is defined.   In any one of Claims 1-5, the part holding the said holder member among the said bodies has a 2nd stopper surface, and when the said holder member contact | abuts to the said 2nd stopper surface, the said A diaphragm type control valve characterized in that a tightening margin of an outer peripheral portion of the diaphragm is defined.   7. The pressure member according to claim 2, wherein a pressure member is interposed between the driving element and the holder member, and the holder member is held by the body via the pressure member. Diaphragm type control valve characterized by   A fuel supply path for supplying fuel fluid to the fuel cell stack, an oxidant supply path for supplying oxidant fluid to the fuel cell stack, and the fuel cell stack according to any one of claims 1 to 7. Of the fuel cell power generation system comprising a fuel discharge path for discharging the fuel off fluid and an oxidant discharge path for discharging the oxidant off fluid from the fuel cell stack, of the fuel discharge path and the oxidant discharge path. A diaphragm type control valve used for at least one of the above.

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