JP2014101962A - Fluid control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a high pressure without increasing the size of a device when the high pressure is applied to a fluid control valve under its closed state by providing the fluid control valve itself with a relief function.SOLUTION: A three-way valve 3 is a fluid control valve in which a valve member 35 is contacted with a valve seat 312b and a flow passage in a valve housing main body 31 is closed and this closed state is kept under an operation in which an output shaft 322a of a motor assembly 32 is set in its position at a valve closing position. The three-way valve 3 is further provided with a resilient deforming member 38 that is resiliently deformed to cause the valve member 35 to move away from the valve seat 312b upon receiving of the valve opening force and that is installed at the midway part of a passage where a valve opening force acting against the valve member 35 contacted with the valve seat 312b is transmitted to the valve housing main body 31 through the valve member 35, valve shaft 33 and motor assembly 32.

Description

  The present invention relates to a fluid control valve that controls the flow of fluid.

A poppet valve type valve seated on a perfect circular valve seat by attaching a circular valve body vertically to the valve shaft and operating the valve body together with the valve shaft in the axial direction has been conventionally used for intake and exhaust of internal combustion engines. Widely used in valves and the like.
As shown in FIG. 1 of Patent Document 1, the three-way valve disclosed in Patent Document 1 is provided on the oxidizing gas supply path of the fuel cell system. As shown in FIG. 2 of Patent Document 1, this three-way valve has a valve housing in which a flow path (consisting of an inflow passage 12 and a first outflow passage 16) having a fluid inlet and an outlet is formed. A main body (casing 4), a driving device 8 attached to the casing 4, a valve shaft 36 connected to an output shaft (driving shaft 58) of the driving device 8 and moving in the axial direction in the casing 4, and a valve shaft It is attached so as to extend in the radial direction with respect to the shaft center of 36, and moves together with the valve shaft 36 to separate or contact the valve seat (first valve seat 30) formed in the flow path of the casing 4, And a valve body (poppet valve 6) that opens and closes the flow path, and the drive shaft 58 of the drive device 8 is positioned and fixed at the closed position, so that the poppet valve 6 comes into contact with the valve seat and the casing 4 The flow path is closed A fluid control valve that state is maintained to be.

JP 2012-99220 A

  In the fluid control valve described in Patent Document 1 described above, the fuel cell 5 is sealed by closing the fluid control valve in order to prevent deterioration of the fuel cell 5 when the operation of the fuel cell system is stopped. However, at this time, the pressure inside the fuel cell 5 may rise abnormally. At that time, it is necessary to prevent leakage, breakage, and the like of the fuel cell 5, auxiliary equipment, and piping.

  The present invention has been made to solve the above-described problems. In the fluid control valve, when a high pressure is applied when the fluid control valve is closed, the fluid control valve itself has a relief function. Therefore, it aims at reducing a pressure, without enlarging an apparatus.

  In order to solve the above problems, a fluid control valve according to a first aspect of the present invention includes a valve housing body in which a flow path having a fluid inlet and an outlet is formed, and a valve housing provided in the valve housing body. A drive device having a fixed portion attached to the fixed portion, a valve shaft coupled to the output shaft of the drive device and moving in the axial direction within the valve housing body, and extending in a radial direction with respect to the axial center of the valve shaft And a valve body that opens or closes the flow path by moving away from or in contact with the valve seat formed in the flow path of the valve housing main body by moving together with the valve shaft, and the output shaft of the drive device A fluid control valve that maintains a state in which the valve body contacts the valve seat and the flow path of the valve housing body is closed by being positioned and fixed at the valve closing position, and the valve body is in contact with the valve seat Open to When a force in the direction is applied, the force is provided in the middle of the path that transmits the force to the valve housing body via the valve body, valve shaft, and drive device. An elastic deformation member that deforms is further provided.

  According to a second aspect of the present invention, in the fluid control valve according to the first aspect, when the elastic deformation member is provided on the valve shaft and a force in the valve opening direction acts on the valve body in contact with the valve seat, the elastic deformation member Is elastically deformed in the axial direction, and the valve body is separated from the valve seat.

  According to a third aspect of the present invention, in the fluid control valve according to the first aspect, the elastically deformable member is provided between the driving device and the fixed portion of the driving device, and the valve element in contact with the valve seat is opened in the valve opening direction. When the force acts, the elastic deformation member is elastically deformed so that the drive device moves in the axial direction with respect to the fixed portion of the drive device, and the valve body is separated from the valve seat.

  According to a fourth aspect of the present invention, in the fluid control valve according to the first aspect, the elastically deformable member is provided between the valve housing fixing portion and the valve housing body, and the valve body in contact with the valve seat is opened in the valve opening direction. When the force acts, the elastic deformation member is elastically deformed so that the valve housing fixing portion moves in the axial direction with respect to the valve housing body, and the valve body is separated from the valve seat.

  According to a fifth aspect of the present invention, in the fluid control valve according to any one of the first to fourth aspects, at least one of the valve body and the valve seat is formed of an elastic material, and seals between both members. A seal portion is further provided.

  According to a sixth aspect of the present invention, in the fluid control valve according to the fifth aspect, the seal portion is formed in a lip shape in cross section.

  The invention according to claim 7 is the fluid control valve according to any one of claims 1 to 6, further comprising a diaphragm that moves together with the valve body, wherein one side of the diaphragm includes a flow path and a valve seat. The other side of the diaphragm faces the air chamber that is prohibited from entering the fluid and is open to the atmosphere, and the effective pressure receiving area of the diaphragm is the effective pressure of the valve body Larger than pressure receiving area.

  In the invention according to claim 1 configured as described above, the fluid control valve is configured so that the output shaft of the driving device is positioned and fixed at the valve closing position, so that the valve body comes into contact with the valve seat and The state where the flow path is closed (valve closed state) is maintained. Further, when a force in the valve opening direction acts on the valve element (the liquid control valve is in a closed state) in contact with the valve seat, the elastic deformation member is transmitted through the valve element, the valve shaft, and the driving device. Is provided in the middle of the path for transmission to the main body of the valve housing. Therefore, when the said force acts on a valve body, an elastic deformation member elastically deforms with the force, and a valve body leaves | separates from a valve seat. Therefore, when a high pressure is applied when the fluid control valve is closed, the liquid control valve is opened by the relief function of the fluid control valve itself. Can be reduced.

  In the invention according to claim 2 configured as described above, in the fluid control valve according to claim 1, an elastically deformable member is provided on the valve shaft, and a force in the valve opening direction acts on the valve element in contact with the valve seat. In this case, the elastically deformable member is elastically deformed in the axial direction, and the valve body is separated from the valve seat. Thereby, the relief function can be given to the fluid control valve itself with a simple configuration in which the configuration of the valve shaft is changed.

  In the invention according to claim 3 configured as described above, in the fluid control valve according to claim 1, the elastically deformable member is provided between the driving device and the fixed portion of the driving device, and is in contact with the valve seat. When a force in the valve opening direction acts on the valve body, the elastic deformation member is elastically deformed so that the drive device moves in the axial direction with respect to the fixed portion of the drive device, and the valve body is separated from the valve seat. Thereby, the fluid control valve itself can be provided with a relief function with a simple configuration in which the configuration of the driving device is changed.

  In the invention according to claim 4 configured as described above, in the fluid control valve according to claim 1, the elastically deformable member is provided between the valve housing fixing portion and the valve housing body, and is in contact with the valve seat. When force in the valve opening direction is applied to the valve body, the elastic deformation member is elastically deformed so that the valve housing fixing portion moves in the axial direction with respect to the valve housing body, and the valve body is separated from the valve seat. Thereby, the relief function can be given to the fluid control valve itself with a simple configuration in which the configuration of the valve housing is changed.

  In the invention according to claim 5 configured as described above, in the fluid control valve according to any one of claims 1 to 4, at least one of the valve body and the valve seat is formed of an elastic material, A seal portion for sealing between both members is further provided. Thereby, while maintaining a high sealing performance, the relief performance can be exhibited at a relatively low pressure.

  In the invention which concerns on Claim 6 comprised as mentioned above, in the fluid control valve of Claim 5, the seal part is formed in the cross-sectional lip shape. As a result, the relief pressure can be set to a relatively low value, and the relief pressure can be easily adjusted.

  In the invention according to claim 7 configured as described above, in the fluid control valve according to any one of claims 1 to 6, the fluid control valve further includes a diaphragm that moves together with the valve body, and one side of the diaphragm It is composed of a passage and a valve seat and faces the fluid chamber through which the fluid flows. The other side of the diaphragm faces the air chamber that is prohibited from entering the fluid and is open to the atmosphere. The area is larger than the effective pressure receiving area of the valve body. Thereby, also in the fluid control valve further provided with the diaphragm that moves together with the valve body, it is possible to obtain the above-described effects of the first to sixth aspects.

1 is a block diagram illustrating a fuel cell system according to a first embodiment of the present invention. It is a fragmentary sectional view at the time of valve closing of the air pressure regulation valve shown in FIG. It is a fragmentary sectional view at the time of valve closing of the three-way valve shown in FIG. FIG. 3 is a partial cross-sectional view in the vicinity of a seal lip for explaining the operation of the air pressure regulating valve shown in FIG. 2. It is sectional drawing for demonstrating the deformation | transformation embodiment of the air pressure regulation valve by 2nd Embodiment. It is sectional drawing for demonstrating the deformation | transformation embodiment of the air pressure regulation valve by 3rd Embodiment.

<First Embodiment>
Hereinafter, the three-way valve 3 and the air pressure regulating valve 4 according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, the three-way valve 3 and the air pressure regulating valve 4 (corresponding to a fluid control valve) according to this embodiment are applied to an oxygen system 2 of a fuel cell system 1 mounted on a vehicle. However, the present invention is not limited to this, and can be widely used as a vehicle fluid control valve such as a fuel supply system or a hydraulic brake system. It can also be applied as a fluid control valve.

In the following description, the upper and lower portions in FIG. 2 are respectively referred to as the upper and lower portions of the air pressure regulating valve 4, and the right side and left side in FIG. 2 are respectively referred to as the right and left sides of the air pressure regulating valve 4. This has nothing to do with the actual mounting direction of the air pressure regulating valve 4 in the vehicle.
As shown in FIG. 1, the fuel cell system 1 includes an oxygen system 2, a fuel system 5, a battery stack 6, a power system 7, a cooling system 8, and a control device 9.

  The battery stack 6 is not limited to this, but is formed by stacking a plurality of solid polymer type single cells. The plurality of single cells are electrically connected in series, and each single cell includes an electrolyte membrane and an anode electrode and a cathode electrode (both not shown) sandwiching the electrolyte membrane. In addition, an anode channel 61 for supplying hydrogen gas to the anode electrode is formed in the single cell anode separator (not shown), and the cathode separator (not shown) has a cathode electrode. On the other hand, a cathode channel 62 for supplying air is formed.

The oxygen system 2 includes an oxygen system supply pipe 21 a, and the oxygen system supply pipe 21 a is connected to one end of the cathode channel 62 in the battery stack 6. On the oxygen supply pipe 21a, an air filter 22, an air compressor 23, an intercooler 24, and a three-way valve 3 are formed in order toward the battery stack 6.
One end of an oxygen-based discharge pipe 21b is connected to the other end of the cathode channel 62, and an air pressure regulating valve 4 that is a two-port fluid control valve is provided on the oxygen-based discharge pipe 21b. The above-described three-way valve 3 is a three-port fluid control valve, and one end of the bypass pipe 21c is connected to the other end of the bypass pipe 21c from the air pressure regulating valve 4 of the oxygen-based discharge pipe 21b. Is also connected to a downstream portion (side to which the battery stack 6 is not connected).

  On the other hand, in the fuel system 5, a hydrogen tank 52 is connected to one end of a fuel system supply pipe 51a, and a shutoff valve 53 is formed on the fuel system supply pipe 51a. The other end of the fuel system supply pipe 51 a is connected to one end of the anode flow path 61 in the battery stack 6. A fuel system discharge pipe 51b is connected to the other end of the anode flow path 61. A gas-liquid separator 54, an exhaust drain valve 55, and a fuel drain pipe 55b are arranged on the fuel system discharge pipe 51b in order from the side close to the battery stack 6. An exhaust gas diluter 56 is formed. The other end of the oxygen-based exhaust pipe 21b described above is connected to the exhaust gas diluter 56.

Further, the gas-liquid separator 54 is connected to a portion between the shut-off valve 53 and the connection portion of the anode flow path 61 on the fuel system supply pipe 51a via the fuel system circulation path 51c. A circulation pump 57 is provided on the fuel system circulation path 51 c to circulate hydrogen gas from the gas-liquid separator 54 toward the anode flow path 61.
The power system 7 includes an electric motor 71 for running the vehicle. The electric motor 71 is connected to the positive electrode and the negative electrode of the battery stack 6 and is driven by the power generation of the battery stack 6.

The cooling system 8 includes a water cooling pump 81 and circulates cooling water in the battery stack 6 to cool the battery stack 6.
The control device 9 is electrically connected to the air compressor 23, the three-way valve 3, the air pressure regulating valve 4, the shutoff valve 53, the circulation pump 57 and the cooling pump 81. The control device 9 controls the operation of each of these components based on the necessary power generation amount of the battery stack 6 calculated according to the running state of the vehicle.
With the configuration described above, when the vehicle starts operation, the control device 9 operates the air compressor 23 to supply air to the cathode flow path 62, and operates the shut-off valve 53 and the circulation pump 57 to supply hydrogen to the anode flow path 61. Gas is supplied and power is generated in the battery stack 6.

In the oxygen system 2, the air containing oxygen sucked through the air filter 22 is compressed by the air compressor 23 and then cooled by the intercooler 24. The three-way valve 3 displaces the position of the valve member in accordance with the amount of power generated by the battery stack 6, and diverts the air supplied from the intercooler 24 and releases it to the bypass pipe 21c. Is controlling.
Further, the air pressure regulating valve 4 controls the pressure in the battery stack 6 by adjusting the opening degree thereof and adjusting the discharge amount of the air remaining in the battery stack 6.

  The hydrogen off-gas (fuel gas off-gas) discharged from the anode channel 61 includes hydrogen gas that has not been used for power generation and water (water vapor) generated by power generation. The gas-liquid separator 54 has a function of separating hydrogen gas and water. The hydrogen gas separated by the gas-liquid separator 54 is supplied and circulated by the circulation pump 57 to the fuel system supply pipe 51a via the fuel system circulation path 51c. The water (liquid) separated by the gas-liquid separator 54 is sent to the exhaust gas diluter 56 together with hydrogen gas when the exhaust / drain valve 55 is opened. The hydrogen gas discharged from the gas-liquid separator 54 to the exhaust gas diluter 56 is diluted by the air supplied from the oxygen-based exhaust pipe 21b in the exhaust gas diluter 56, and then released to the outside together with water. The

  Next, the structure of the air pressure regulating valve 4 will be described in detail. As shown in FIG. 2, the air pressure regulating valve 4 is formed by attaching a motor assembly 42 (corresponding to a driving device) to an outer peripheral surface of a valve housing 41 (corresponding to a valve housing main body). The valve housing 41 is formed by coupling a valve body 411 made of a synthetic resin material such as polyphenylene sulfide and a valve cover 412 integrally formed of a metal plate. In the present embodiment, the motor assembly 42 using an electric motor is used as the driving device, but a solenoid actuator, an actuator driven by gas pressure, or the like may be used.

  A metal cover mounting sleeve 411 a for mounting the valve cover 412 is inserted into the valve body 411. Further, a metal sleeve 411c for attaching the air pressure regulating valve 4 to the vehicle is inserted into the flange portion 411b of the valve body 411. Female screws are formed on the inner peripheral surfaces of the cover mounting sleeve 411a and the metal sleeve 411c.

The valve body 411 is formed with a pressure regulating valve inlet 411d (corresponding to an inflow port) that opens to the right in FIG. The pressure regulating valve inlet 411d is connected to the other end of the cathode flow path 62 of the battery stack 6 via the oxygen-based discharge pipe 21b described above (shown in FIG. 1). Further, the valve body 411 is formed with a pressure regulating valve outlet 411e (corresponding to an outlet) that opens in a direction perpendicular to the pressure regulating valve inlet 411d (opens downward in FIG. 2). The pressure regulating valve outlet 411e is connected to the exhaust gas diluter 56 via the oxygen-based exhaust pipe 21b described above. The flow path from the pressure regulating valve inlet 411d to the pressure regulating valve outlet 411e is the flow path described in the claims.
Furthermore, a pressure regulating valve seat 411f (corresponding to a valve seat) is formed between the pressure regulating valve inlet 411d and the pressure regulating valve outlet 411e on the inner peripheral surface of the valve body 411. The pressure regulating valve seat 411f is formed in a flat annular shape.

  The valve cover 412 is attached to the upper end surface of the valve body 411 by tightening a penetrating attachment bolt 413 to the cover attachment sleeve 411a. The valve cover 412 has a mounting surface 412a to the valve body 411, a motor mounting portion 412b that protrudes upward from the mounting surface 412a, and a stepped lower portion at the center of the motor mounting portion 412b, and the lower end portion is opened. It is formed by the shaft accommodating part 412c. A plurality of female screw holes 412d are provided on the upper surface of the motor mounting portion 412b. The valve cover 412 is integrally formed with the mounting surface 412a, the motor mounting portion 412b, and the shaft housing portion 412c described above by press-molding a metal plate.

  The motor assembly 42 described above is attached to the upper surface of the motor attachment portion 412b. The motor assembly 42 includes a plurality of mounting screws 43 that are passed through the mounting flange 421b in a state where the outer peripheral surface of the mechanism housing portion 421a of the motor case 421 is fitted to the inner peripheral surface of the shaft housing portion 412c. The valve cover 412 is fixed by being fastened to the female screw hole 412d of the portion 412b. The mounting screw 43 is loosely fitted into a through hole (not shown) formed in the mounting flange 421b, and the valve cover 412 has an inner circumferential surface of the shaft housing portion 412c that contacts the outer circumferential surface of the mechanism housing portion 421a. The positioning is performed by contact.

  A stepping motor 422 is fixed to the inner wall of the motor case 421. The tip of the output shaft 422a (corresponding to the output shaft) of the stepping motor 422 has a cylindrical shape, and a drive hole 422b is formed in the axial center. A female screw having a predetermined length is formed on the inner peripheral surface of the drive hole 422b, and is screwed with a male screw portion 441 formed on the outer peripheral surface of the end portion of the valve shaft 44 (corresponding to the valve shaft). Yes.

  The valve shaft 44 is made of a metal material such as stainless steel, and a two-sided width portion 442 is formed below the male screw portion 441. The two-surface width portion 442 is engaged with a pair of opposed surfaces (not shown) formed at the lower end portion of the motor case 421, so that the valve shaft 44 cannot rotate with respect to the motor case 421. Yes. Therefore, when the output shaft 422a of the stepping motor 422 rotates in one direction, the valve shaft 44 descends in the axial direction in the valve housing 41, and when the output shaft 422a rotates in the opposite direction, the valve shaft 44 rises.

  The male screw portion 441 of the valve shaft 44 and the female screw of the output shaft 422a are both formed by trapezoidal screws, and the reverse efficiency between the valve shaft 44 and the output shaft 422a is set to be substantially zero. It is desirable that As a result, the transmission of the operation between the valve shaft 44 and the output shaft 422a is irreversibly formed, and a return load works from the valve shaft 44 toward the output shaft 422a in a state where the air pressure regulating valve 4 is closed. In this case, the output shaft 422a does not rotate in the valve opening direction, and the air pressure regulating valve 4 does not open carelessly.

  As shown in FIG. 2, a cylindrical portion 443 that protrudes from the motor case 421 and extends in the axial direction with a certain diameter is formed below the two-surface width portion 442 of the valve shaft 44. The outer peripheral surface of the cylindrical portion 443 is supported by a shaft retainer portion 412e formed at the lower end of the shaft housing portion 412c of the valve cover 412 so as to be movable in the axial direction. Electroless nickel plating or the like is applied to the outer peripheral surface of the cylindrical portion 443 or the shaft retainer portion 412e that are in contact with each other to improve the wear resistance of the sliding surface.

  The cylindrical portion 443 is provided with an elastic deformation member 48. The elastic deformation member 48 is formed of an elastic material such as rubber, for example. Moreover, you may make it comprise with a coil spring. The elastic deformation member 48 expands and contracts in the axial direction of the cylindrical portion 443. When the elastic deformation member 48 is made of an elastic material such as rubber, the elastic deformation member 48 may be formed in a columnar shape (or cylindrical shape) having substantially the same diameter as the columnar portion 443. It is fixed to. When the elastic deformation member 48 is formed of a coil spring, it may be formed to have an outer diameter that is substantially the same diameter as the cylindrical portion 443, and the upper and lower ends in the axial direction are fixed to the upper and lower portions of the cylindrical portion 443.

When a force in the valve opening direction is applied to the valve member 45 in contact with the valve seat 411f, the elastic deformation member 48 transmits the force to the valve housing body 41 via the valve member 45, the valve shaft 44, and the motor assembly 42. The valve member 45 is elastically deformed so as to be separated from the valve seat 411f when the force is applied. In this embodiment, when a force in the valve opening direction is applied to the valve member 45 in contact with the valve seat 411f, the elastic deformation member 48 is elastically deformed in the axial direction of the cylindrical portion 443, and the valve member 45 is Move away from the seat 411f.
Note that the elastically deformable member 48 may be provided in a portion other than the cylindrical portion 443 as long as it is the valve shaft 44.

  Further, a connecting portion 444 (corresponding to a portion housed in the mounting portion) formed to have a smaller diameter than the cylindrical portion 443 is integrally formed at the tip portion of the cylindrical portion 443. The connecting portion 444 is formed in a two-plane width shape having a pair of flat surfaces 444a facing each other on the outer peripheral surface.

  A ball hole 445 (corresponding to a through hole) passes through the connecting portion 444 in a direction orthogonal to the axial center, and both end portions of the ball hole 445 open to be orthogonal to the opposed flat surface 444a. ing. A steel ball 446 (corresponding to a sphere) is disposed in the ball hole 445. The diameter of the steel balls 446 is set to be larger than the distance between the flat surfaces 444 a (thickness of the two surfaces), and the steel balls 446 protrude from both end portions of the ball hole 445. The diameter of the steel ball 446 is slightly smaller than the diameter of the ball hole 445, and the steel ball 446 is accommodated in the ball hole 445 so as to be rotatable and movable in the axial direction of the ball hole 445. Has been.

  A valve member 45 (corresponding to a valve element) is attached to a steel ball 446 provided at the tip of the valve shaft 44 so as to extend in the radial direction with respect to the axis of the valve shaft 44. The valve frame 451 of the valve member 45 is formed by press-molding a metal plate such as stainless steel. The valve frame 451 has a flat plate portion 451a extending in a disk shape in the radial direction with respect to the axis of the valve shaft 44, and a seal member 452 is fixed to the flat plate portion 451a so as to cover the outer peripheral edge. Yes.

  The seal member 452 is formed of a heat-resistant synthetic rubber material such as SBR (styrene-butadiene rubber) or EPDM (ethylene-propylene-diene copolymer). On the lower surface of the seal member 452, a seal lip 452 a that can come into contact with the pressure regulating valve seat 411 f formed on the valve body 411 protrudes as the valve member 45 is lowered. As shown in FIG. 2, the seal lip 452a (corresponding to the seal portion) is formed in a cross-sectional lip shape. The seal lip 452a is radially sealed so as to be self-sealed by negative pressure generated by a reaction between hydrogen gas and oxygen remaining in the battery stack 6 or condensation of residual water vapor due to a temperature drop of the battery stack 6 when power generation is stopped. It is formed inward (toward the pressure regulating valve outlet 411e).

The valve frame 451 is formed with a step portion 451b (a configuration including the flat plate portion 451a and the step portion 451b corresponds to the extending portion) continuous to the center portion in the radial direction of the flat plate portion 451a. The step portion 451b extends in the axial direction of the valve shaft 44, and is formed at two locations such that radial steps are aligned in the axial direction.
Further, the valve frame 451 has a cylindrical portion 451c (corresponding to a cylindrical portion) whose one end is continuous with the stepped portion 451b. The cylindrical portion 451c extends in a direction perpendicular to the flat plate portion 451a, and the columnar portion 443 of the valve shaft 44 is inserted therein. Further, the valve frame 451 is formed continuously with the other end of the cylindrical portion 451c, and has a mounting portion 451d capable of accommodating the connecting portion 444 of the valve shaft 44 by closing the tip end in a bag shape. doing.

  The attachment portion 451d has a pair of fixed walls 451e so as to face the flat surface 444a of the connection portion 444 when the connection portion 444 of the valve shaft 44 is accommodated. From each fixed wall 451e, when the connecting portion 444 is inserted into the mounting portion 451d, a fitting portion 451f that can accommodate the steel ball 446 protrudes. The attachment portion 451d is formed with a pair of facing connection surface portions (not shown) so as to connect the fixed walls 451e.

The distance between the inner peripheral surfaces of both the fixed walls 451e is larger than the distance between the flat surfaces 444a of the connecting portion 444 (thickness of two surfaces), and the distance between the inner peripheral surfaces of both connecting surface portions is the connecting portion. The distance between the side portions 444b of 444 is set larger than the distance between them.
When the valve member 451 is attached to the valve shaft 44, the connecting portion 444 is arranged such that the steel ball 446 protruding from the flat surface 444a is accommodated in the fitting portion 451f in a state where the steel ball 446 is disposed in the ball hole 445. Is inserted into the mounting portion 451d. Thereafter, both the fixing walls 451e are caulked against the steel ball 446 to form a caulking portion 451h, and the attachment portion 451d is fixed to the steel ball 446.

  Further, in the state where the valve frame 451 is attached to the valve shaft 44, the axial center of the valve shaft 44 is between the inner peripheral surface of the cylindrical portion 451 c and the outer peripheral surface of the cylindrical portion 443 of the inserted valve shaft 44. A radial gap ε (hereinafter referred to as a radial gap ε) is formed. The radial gap ε is formed over the entire circumference between the inner peripheral surface of the cylindrical portion 451c and the outer peripheral surface of the columnar portion 443. By providing the radial clearance ε, the valve member 45 is formed to be tiltable with respect to the valve shaft 44.

  As shown in FIG. 2, a spring retainer 453 is press-fitted and fixed to the inner peripheral surface of the step portion 451b of the valve frame 451 from above. The spring retainer 453 is formed by squeezing a metal plate in a pressing process. The spring retainer 453 includes a cylindrical fixing portion 453a positioned between a step formed below the step portion 451b and the column portion 443, and a shoulder portion 453b extending radially outward from the fixing portion 453a. Have.

  The fixing portion 453a of the spring retainer 453 is press-fitted into the inner peripheral surface of the step portion 451b of the valve frame 451 until the shoulder portion 453b contacts the upper surface of the flat plate portion 451a of the valve frame 451. Since the fixing portion 453a press-fitted into the stepped portion 451b has a gap with the outer peripheral surface of the columnar portion 443 of the valve shaft 44, the inclination of the valve member 45 with respect to the valve shaft 44 is not hindered.

In addition, an O-ring 454 that is a seal member is interposed between a step formed above the step portion 451b and the fixing portion 453a. The O-ring 454 exhibits a sealing function between the valve frame 451 and the fixed portion 453a, and moisture or foreign matter that has entered the air pressure regulating valve 4 is separated by a mounting portion 451d of the valve frame 451 or a diaphragm 46 described later. The air chamber 415 is prevented from entering.
Furthermore, the spring retainer 453 includes a connecting portion 453c extending upward from the shoulder portion 453b, and a tightening portion 453d extending outward in the radial direction from the connecting portion 453c.

  The diaphragm holder 455 has an engaging portion 455a extending in the axial direction of the valve shaft 44 at the radially inner end, and the pressing portion 455b extends in the radial direction from the upper end of the engaging portion 455a. The engaging portion 455a is press-fitted into the inner peripheral surface of the connecting portion 453c until the lower surface of the pressing portion 455b contacts the upper end of the connecting portion 453c of the spring retainer 453, whereby the spring retainer 453 and the diaphragm holder 455 are integrated. Has been.

  The inner peripheral edge of the diaphragm 46 is fixed between the tightening portion 453 d of the spring retainer 453 and the pressing portion 455 b of the diaphragm holding body 455. The diaphragm 46 is integrally formed of a synthetic rubber material, and a mounting hole 461 penetrating the front and back is formed at a substantially central portion. The peripheral edge of the mounting hole 461 is clamped in the vertical direction by the tightening portion 453d and the pressing portion 455b, and is fixed in a liquid-tight manner between the two.

  The outer peripheral edge of the diaphragm 46 is sandwiched between the upper end surface of the valve body 411 and the lower end of the motor mounting portion 412b of the valve cover 412, and is fixed in a liquid-tight manner. In this way, the diaphragm 46 is attached to the inner peripheral surface of the valve housing 41 and the valve member 45, whereby the inside of the valve housing 41 is divided into two by the diaphragm 46 and the valve member 45. That is, the inside of the valve housing 41 is filled with air, such as a fluid pressure chamber inlet 411d, a pressure regulator valve outlet 411e, and a fluid pressure chamber seat 411f through which the supplied fluid passes, and the fluid is prevented from entering. An air chamber 415 is formed. The air chamber 415 communicates with the outside air through a vent hole (not shown) provided in the valve cover 412.

  The diaphragm 46 moves together with the valve member 45. One side of the diaphragm 46 includes the flow path and the valve seat 411f and faces the fluid chamber 414 through which the fluid flows, and the other side of the diaphragm 46 is prohibited from entering the fluid and opened to the atmosphere. It faces the air chamber 415. Further, the effective pressure receiving area of the diaphragm 46 is larger than the effective pressure receiving area of the valve member 45.

  A coil spring 47 is interposed between the shoulder portion 453b of the spring retainer 453 and the step portion of the shaft accommodating portion 412c of the valve cover 412 so as to surround the valve shaft 44 in the circumferential direction. The coil spring 47 is elastically mounted between the spring retainer 453 and the valve cover 412 and urges the valve member 45 toward the distal end of the valve shaft 44.

  When a fluid having a predetermined pressure such as air is supplied from the pressure regulating valve inlet 411d to the inside of the valve housing 41, the diaphragm 46 receives the pressure from the fluid, and the upper portion of the valve member 45 is moved by the diaphragm 46. It is pulled evenly on the circumference and held without tilting with respect to the axis of the valve shaft 44 without being displaced from the axis of the valve shaft 44 (centering).

  Further, due to the biasing force of the coil spring 47 toward the distal end of the valve shaft 44, the lower portion of the valve member 45 is not displaced from the axis of the valve shaft 44 (centering), and is centered on the valve shaft 44. It is held without tilting. Further, the biasing force of the coil spring 47 fills up and down the gap between the steel ball 446 and the ball hole 445 when the air pressure regulating valve 4 is opened, thereby preventing the vibration of the valve member 45 and the accompanying noise. can do.

  Such holding force of the diaphragm 46 and the coil spring 47 prevents vibration of the valve member 45 and generation of noise accompanying the operation of the air pressure regulating valve 4, and the flow rate of the fluid passing through the inside of the air pressure regulating valve 4. Variations can be reduced. The coil spring 47 may be interposed between the pressing portion 455b of the diaphragm holder 455 and the valve cover 412 instead of being provided between the spring retainer 453 and the valve cover 412.

  Next, the operation method of the air pressure regulating valve 4 will be briefly described. When the valve shaft 44 is above and the seal member 452 of the valve member 45 is separated (separated) from the pressure regulating valve seat 411f, the air pressure regulating valve 4 is in an open state (not shown). In this state, the pressure regulating valve inlet 411d and the pressure regulating valve outlet 411e communicate with each other, and fluid such as air is allowed to flow between them.

  When the stepping motor 422 is rotated in one direction by the drive signal from the control device 9, the valve member 45 is lowered in the axial direction together with the valve shaft 44, and the seal member 452 is seated (contacted) on the pressure regulating valve seat 411f. Shown). As a result, the air pressure regulating valve 4 is closed, the communication between the pressure regulating valve inlet 411d and the pressure regulating valve outlet 411e is cut off, and the fluid flow between both is cut off. That is, in the air pressure regulating valve 4, the output shaft 422a of the motor assembly 42 is positioned and fixed at the valve closing position, so that the valve member 45 contacts the valve seat 411f and the flow path of the valve housing body is closed. Maintained.

  When the seal member 452 is seated on the pressure regulating valve seat 411f, if the accuracy of parallelism varies between the seal surfaces of both the seal member 452 and the pressure regulating valve seat 411f, the seal surface of the pressure regulating valve seat 411f Similarly, the valve member 45 is inclined with respect to the valve shaft 44 while bending the coil spring 47, and the sealing performance between the valve member 45 and the pressure regulating valve seat 411f can be ensured.

  The valve member 45 includes a cylindrical portion 451c into which the valve shaft 44 is inserted with a radial clearance ε between the valve member 44 and a flat plate extending in the radial direction from the cylindrical portion 451c to the valve shaft 44. A valve frame 451 having a portion 451a, one end continuous to the cylindrical portion 451c, the other end closed in a bag shape, and housing the tip of the valve shaft 44 inside, and an outer peripheral surface of the flat plate portion 451a And a seal member 452 that can be brought into contact with the pressure regulating valve seat 411f. The connecting portion 444, which is a portion accommodated in the mounting portion of the valve shaft 44, has an axial center. A ball hole 445 is provided in a direction orthogonal to the ball hole 445, and a rotatable steel ball 446 is disposed in the ball hole 445. When the parallelism between the plane direction of the valve member 451 and the sealing surface of the pressure regulating valve seat 411f is uneven due to being fixed by crimping to the steel 6, the steel ball 446 is rotated. The valve member 451 can be inclined with respect to the valve shaft 44 until the radial clearance ε is filled, and the valve member 451 and the pressure regulating valve seat can be improved without improving the dimensional accuracy of the components or increasing the size of the air pressure regulating valve 4. It is possible to ensure the sealing property between the 411f and the 411f.

  Next, the structure of the three-way valve 3 (corresponding to a fluid control valve) will be described in detail with reference to FIG. In the following description, the upper and lower portions in FIG. 3 are respectively described above and below the three-way valve 3, and the right and left portions in FIG. 3 are respectively described as the right and left sides of the three-way valve 3. This is independent of the actual mounting direction of the three-way valve 3 in FIG.

  As shown in FIG. 3, the three-way valve 3 is also formed by attaching a motor assembly 32 (corresponding to a driving device) to the outer peripheral surface of the valve housing 31, similarly to the air pressure regulating valve 4. The valve housing 31 (corresponding to the valve housing body) is formed by fitting a first body 311 and a second body 312 made of a synthetic resin material such as polyphenylene sulfide together in a liquid-tight manner. Yes.

  The first body 311 is formed with a three-way valve inlet 311a (corresponding to an inflow port) that opens to the right in FIG. The three-way valve inlet 311a is connected to the intercooler 24 via the oxygen-based supply pipe 21a described above (shown in FIG. 1). Further, the second body 312 is formed with a three-way valve outlet 312a (corresponding to the outlet) that opens in a direction perpendicular to the three-way valve inlet 311a (opens downward in FIG. 3). The three-way valve outlet 312a is connected to one end of the cathode flow path 62 of the battery stack 6 via the oxygen-based supply pipe 21a described above (shown in FIG. 1). Further, the first body 311 is provided with a bypass port 311b that opens to the left in FIG. The bypass port 311b is connected to the exhaust gas diluter 56 via the bypass pipe 21c described above (shown in FIG. 1).

A control valve seat 312b (corresponding to a valve seat) is formed between the three-way valve inlet 311a and the three-way valve outlet 312a on the inner peripheral surface of the second body 312. The control valve seat 312b is formed in a flat annular shape.
A cylindrical seat body 311c extends downward from the inner upper surface of the first body 311. The lower end of the seating body 311c is formed flat, and a bypass valve seat 311d located between the three-way valve inlet 311a and the three-way valve outlet 312a and the bypass port 311b is formed. A cylindrical shaft support portion 311e protrudes from the inner peripheral upper surface of the first body 311 so as to be located inward in the radial direction of the seat body 311c.

Similar to the air pressure regulating valve 4 described above, the motor assembly 32 described above is attached to the upper surface of the valve housing 31. The motor assembly 32 penetrates the motor case 321 with the outer peripheral surface of the mechanism housing portion 321a of the motor case 321 fitted to the inner peripheral surface of the motor mounting boss 311f formed at the upper end portion of the first body 311. The plurality of mounting screws 39 thus fixed are fastened to the first body 311 by fastening them to the fixing portion 311g (corresponding to the valve housing fixing portion) of the first body 311. The mounting screw 39 is loosely fitted in a through hole (not shown) formed in the fixing portion 321b of the motor case 321, and the motor assembly 32 has an outer peripheral surface of the mechanism housing portion 321a within the motor mounting boss 311f. The positioning is performed by contacting the circumferential surface.
The fixing portion 311g of the first body 311 is a flange portion extending outward from the opening end of the motor mounting boss 311f. A fixing portion 321b of the motor case 321 is attached to a valve housing fixing portion 311g provided in the valve housing body.

Similar to the air pressure regulating valve 4, a stepping motor 322 is fixed in the motor case 321, and the rotational motion of the output shaft 322 a (corresponding to the output shaft) of the stepping motor 322 is converted into straight motion, and the valve shaft 33 (corresponding to the valve shaft). The tip of the output shaft 322a of the stepping motor 322 has a cylindrical shape, and a drive hole 322b is formed in the axial center. A female screw having a predetermined length is formed on the inner peripheral surface of the drive hole 322b, and is screwed with a male screw portion 339 formed on the outer peripheral surface of the end of the valve shaft 33.
The valve shaft 33 is supported so as to be movable in the axial direction on the inner peripheral surface of the shaft support portion 311e described above.

  A cylindrical portion 331 extending in the axial direction with a constant diameter is formed at a substantially central portion in the length direction of the valve shaft 33. In addition, a first land portion 332 having the same diameter as the cylindrical portion 331 is provided above the cylindrical portion 331, and the first seal groove 333 is circular between the cylindrical portion 331 and the first land portion 332. It is formed on the circumference. In the first seal groove 333, a seal packing 34 made of a synthetic rubber material is mounted. The seal packing 34 exhibits a sealing performance between the outer peripheral surface of the valve shaft 33 and the inner peripheral surface of the shaft support portion 311e, and prevents water, foreign matter and the like from entering the motor assembly 32.

  Further, the valve shaft 33 is provided with an elastic deformation member 38 configured similarly to the elastic deformation member 48 described above. For example, the elastic deformation member 38 is provided in the cylindrical portion 331. The elastic deformation member 38 is made of, for example, an elastic material such as rubber or a coil spring, and expands and contracts in the axial direction of the cylindrical portion 331. When the elastic deformation member 38 is made of an elastic material such as rubber, it may be formed in a columnar shape (or a cylindrical shape) having substantially the same diameter as the valve shaft 33, and the upper and lower ends in the axial direction are the upper and lower portions of the columnar portion 331. It is fixed to. When the elastic deformation member 38 is configured by a coil spring, the elastic deformation member 38 may be formed in a columnar shape (or cylindrical shape) having substantially the same diameter as the valve shaft 33, and the upper and lower ends in the axial direction are fixed to the upper and lower portions of the columnar portion 331. ing.

When a force in the valve opening direction (upward direction in the drawing) is applied to the valve member 35 that is in contact with the valve seat 312 b, the elastic deformation member 38 receives the force via the valve member 35, the valve shaft 33, and the motor assembly 32. It is provided in the middle of a path for transmission to the housing body 31, and the valve member 35 is elastically deformed so as to be separated from the valve seat 312b when the force is applied. In the present embodiment, when a force in the valve opening direction is applied to the valve member 35 in contact with the valve seat 312b, the elastic deformation member 38 is elastically deformed in the axial direction of the cylindrical portion 331, and the valve member 35 is Move away from the seat 312b.
Note that the elastically deformable member 38 may be provided in a portion other than the cylindrical portion 331 as long as it is the valve shaft 33.

A connecting portion 334 having a smaller diameter than that of the columnar portion 331 (corresponding to a portion accommodated in the mounting portion) is integrally formed at the distal end portion of the valve shaft 33. Similar to the air pressure regulating valve 4, the connecting portion 334 is formed in a two-sided width shape having a pair of flat surfaces 334 a facing each other on the outer peripheral surface.
A ball hole 335 (corresponding to a through hole) passes through the connecting portion 334 in a direction orthogonal to the axis, and both end portions of the ball hole 335 are opened to be orthogonal to the opposed flat surface 334a. ing. A steel ball 336 (corresponding to a sphere) is disposed in the ball hole 335 so as to be rotatable and movable in the axial direction of the ball hole 335. The dimensional relationship among the connecting portion 334, the ball hole 335, and the steel ball 336 is set similarly to the case of the air pressure regulating valve 4 described above.

Similar to the air pressure regulating valve 4, a valve member 35 (corresponding to a valve body) is attached to the connecting portion 334. The valve frame 351 of the valve member 35 has a flat plate portion 351a extending in a disc shape in the radial direction with respect to the axis of the valve shaft 33. The flat plate portion 351a has an outer peripheral surface (upper surface and outer peripheral edge). A sealing member 352 made of a synthetic rubber material is covered so as to cover the surface.
A seal lip 352a (corresponding to a seal portion) that can come into contact with the control valve seat 312b formed on the second body 312 protrudes from the lower surface of the seal member 352 when the valve member 35 is lowered. As shown in FIG. 3, the seal lip 352a is formed radially outward so as to be self-sealed by the negative pressure generated by the reaction between the hydrogen gas remaining in the battery stack 6 and oxygen. Further, the upper surface of the seal member 352 is formed to be flat, and can come into contact with the bypass valve seat 311d formed on the first body 311 as the valve member 35 rises.

  The valve frame 351 is formed with a concave portion 351b (a configuration including the flat plate portion 351a and the concave portion 351b corresponds to the extending portion) recessed in the distal end direction of the valve shaft 33 at the radial center of the flat plate portion 351a. Yes. Further, the valve frame 351 has a cylindrical portion 351c (corresponding to a cylindrical portion) whose one end is continuous with the inner peripheral end of the concave portion 351b. The cylindrical portion 351c extends in a direction perpendicular to the flat plate portion 351a, and the columnar portion 331 of the valve shaft 33 is inserted therein.

Further, similarly to the air pressure regulating valve 4, the valve frame 351 has an attachment portion 351 d that is formed continuously with the other end of the cylindrical portion 351 c and receives the connection portion 334 of the valve shaft 33. The mounting portion 351d is caulked against the steel ball 336 protruding from the ball hole 335, and is fixed to the steel ball 336 so as not to drop off.
In FIG. 3, in order to attach the valve member 35 to the valve shaft 33, among the configurations formed in the mounting portion 351 d, the same configurations as those of the air pressure regulating valve 4 are omitted.

Similar to the air pressure regulating valve 4, the valve frame 351 is attached to the valve shaft 33, and the valve shaft 33 is disposed between the inner peripheral surface of the cylindrical portion 351 c and the outer peripheral surface of the columnar portion 331 of the valve shaft 33. A radial gap ε with respect to the axial center of is formed on the entire circumference.
In the valve shaft 33, a second land portion 337 having the same diameter as the cylindrical portion 331 is provided above the connecting portion 334, and the second land portion 337 has a second land portion 337 between the lower end thereof and the second land portion 337. Two seal grooves 338 are formed on the circumference. In the second seal groove 338, a ring-shaped shaft seal 36 (corresponding to a ring-shaped seal member) formed of a synthetic rubber material is mounted. The shaft seal 36 exhibits sealing performance between the outer peripheral surface of the valve shaft 33 and the inner peripheral surface of the cylindrical portion 351c of the valve frame 351, and water and foreign matter into the cylindrical portion 351c and the mounting portion 351d of the valve frame 351. Preventing the intrusion of etc.

  The shaft seal 36 is elastically provided between the outer peripheral surface of the valve shaft 33 and the inner peripheral surface of the cylindrical portion 351c of the valve frame 351, and generates a predetermined sliding resistance therebetween. For this reason, the valve member 35 is held by the shaft seal 36 around the axis of the valve shaft 33 (centering), and the vibration of the valve member 35 with respect to the valve shaft 33 and the noise accompanying the vibration can be reduced. The flow rate fluctuation of the fluid passing through the inside of the valve 3 can be reduced.

  A valve spring 37 is interposed between the recess 351 b of the valve frame 351 and the inner upper surface of the first body 311. The inner peripheral surface of the valve spring 37 is fitted to the outer peripheral surface of the shaft support portion 311e described above. The valve spring 37 is elastically mounted between the valve frame 351 and the first body 311 and biases the valve member 35 toward the distal end of the valve shaft 33. Due to the urging force of the valve spring 37, the valve member 35 is held without being tilted about the axis of the valve shaft 33 without being displaced from the axis of the valve shaft 33 (centering).

  Next, the operation method of the three-way valve 3 will be briefly described. When the valve shaft 33 is on the upper side, the upper surface of the seal member 352 of the valve member 35 is seated (contacted) with the bypass valve seat 311d and is separated (separated from the control valve seat 312b). At this time, the three-way valve inlet 311a and the three-way valve outlet 312a communicate with each other, and a fluid such as air is allowed to flow between them, and between the three-way valve inlet 311a and the three-way valve outlet 312a and the bypass port 311b. Communication is cut off, and the fluid flow between them is cut off.

  When the seal member 352 is seated on the bypass valve seat 311d, if the accuracy of parallelism varies between the seal member 352 and the seal surface of the bypass valve seat 311d, the steel ball 336 rotates, Following the sealing surface of the bypass valve seat 311d, the valve member 35 is inclined with respect to the valve shaft 33 while deflecting the valve spring 37, and the sealing performance between the valve member 35 and the bypass valve seat 311d is ensured. it can.

  When the stepping motor rotates in one direction by the drive signal from the control device 9, the valve member 35 is lowered in the axial direction together with the valve shaft 33, the upper surface of the seal member 352 is separated from the bypass valve seat 311d, and the seal lip 352a is It sits on (contacts with) the control valve seat 312b, as shown in FIG. At this time, the three-way valve inlet 311a and the bypass port 311b communicate with each other, and the flow of fluid such as air between them is allowed, and between the three-way valve inlet 311a and the bypass port 311b and the three-way valve outlet 312a. The communication is interrupted and the fluid flow between them is interrupted.

When the seal member 352 is seated on the control valve seat 312b, if the accuracy of parallelism varies between the seal surfaces of the seal member 352 and the control valve seat 312b, the steel ball 336 rotates. Following the sealing surface of the control valve seat 312b, the valve member 35 is inclined with respect to the valve shaft 33 while bending the valve spring 37, and the sealing performance between the valve member 35 and the control valve seat 312b is ensured. Can do.
In the three-way valve 3, the valve member 35 takes an arbitrary position between the control valve seat 312b and the bypass valve seat 311d, thereby allowing the three-way valve outlet 312a and the bypass port 311b of the fluid supplied from the three-way valve inlet 311a. The flow rates respectively diverted to can be controlled based on the cross-sectional area of the passage through which the fluid passes.

Furthermore, the action at the time of relief is demonstrated based on FIG. During normal sealing, the seal lip 452a is in contact with the valve seat 411f in a collapsed state (FIG. 4 (a)). In addition, since the pressure inside the fuel cell 6 (the anode flow path 61) is a negative pressure (lower than the atmospheric pressure), the seal lip 452a receives pressure from the fluid chamber 414 side, so that the sealing performance becomes higher. Yes.
At the time of sealing, when the pressure inside the fuel cell 6 (the anode flow path 61) becomes high, the valve member 45 receives the pressure, and the elastic deformation member 48 is contracted in the axial direction by the force, so that the valve member 45 Moves away from the valve seat 411f (moves in the valve opening direction). However, since the force to return to the original shape acts on the collapsed seal lip 452a, the tip of the seal lip 452a is in contact with the valve seat 411f without being separated (FIG. 4B).
Further, when the pressure inside the fuel cell 6 (the anode flow path 61) increases, the force due to the pressure exceeds the force to return to the original shape of the seal lip 452a, and thus warping (bending) of the seal lip 452a occurs. Thus, the secondary side pressure can be released to the primary side (FIG. 4C).

  According to the present embodiment, the three-way valve 3 (fluid control valve) is configured such that the output shaft 322a (output shaft) of the motor assembly 32 (drive device) is positioned and fixed at the valve closing position, whereby the valve member 35 (valve The body is in contact with the valve seat 312b and the flow path of the valve housing body is closed (valve closed state). In addition, when the force in the valve opening direction acts on the valve member 35 (the liquid control valve is in a closed state) in contact with the valve seat 312b, the elastic deformation member 38 is applied to the valve member 35, the valve shaft. 33 (valve shaft) and the motor assembly 32 (driving device) are provided in the middle of a path for transmission to the valve housing body 41. Therefore, when the force is applied to the valve member 35, the elastic deformation member 38 is elastically deformed by the force, so that the valve member 35 is separated from the valve seat 312b. Therefore, when the three-way valve 3 (fluid control valve) is in a closed state and a high pressure is applied, the three-way valve 3 (fluid control valve) itself has a relief function. By opening the valve, the pressure can be reduced without increasing the size of the apparatus.

  Further, since the relief pressure is determined by the rigidity of the elastic deformation member 38 and the seal lip 352a, the relief pressure can be easily set and changed within the range of the normal operating pressure. That is, the pressure can be relatively low, and the pressure can be easily adjusted.

  Further, in the three-way valve 3 (fluid control valve), when an elastic deformation member 38 is provided on the valve shaft 33 (valve shaft) and a force in the valve opening direction acts on the valve member 35 that is in contact with the valve seat 312b, the elastic deformation member 38 is elastic. The deformable member 38 is elastically deformed in the axial direction, and the valve member 35 is separated from the valve seat 312b. Thereby, the relief function can be given to the fluid control valve itself with a simple configuration in which the configuration of the valve shaft 33 (valve shaft) is changed.

  In the three-way valve 3 (fluid control valve), the seal lip 352a (seal part) is formed in a cross-sectional lip shape. As a result, the relief pressure can be set to a relatively low value, and the relief pressure can be easily adjusted.

  In addition, the above-described operation and effect can be obtained also in the air pressure regulating valve 4 (fluid control valve) further including a diaphragm 46 that moves together with the valve member 45 (valve element).

  In the first embodiment described above, the elastically deformable members 38 and 48 are provided in both the three-way valve 3 and the air pressure regulating valve 4, but may be provided only in one of the three-way valve 3 and the air pressure regulating valve 4. Good.

  Further, in the fluid control valve (the three-way valve 3 and the air pressure regulating valve 4) according to the first embodiment described above, the valve member 35 or the valve member 45 is provided with a seal lip 352a or a seal lip 452a as a seal portion, and the valve The seal is provided between the member 35 and the valve seat 312b or between the valve member 45 and the valve seat 411f. However, a seal portion may be provided on the valve seat 312b or the valve seat 411f. Thereby, while maintaining a high sealing performance, the relief performance can be exhibited at a relatively low pressure.

  Further, the seal lip 352a (seal part) is formed in a cross-sectional lip shape, but is not limited thereto, and may be formed in a semicircular cross-section.

Second Embodiment
In the three-way valve 3 of the first embodiment described above, the elastic deformation member 38 is provided on the valve shaft 33. However, the elastic deformation member 38 is connected to the valve member 312b (the liquid control valve is in contact with the valve seat 312b). When the force in the valve opening direction is applied to the valve housing body 41), the force is transmitted to the valve housing body 41 via the valve member 35, the valve shaft 33 (valve shaft) and the motor assembly 32 (drive device). You may make it provide in the middle.
For example, as shown in FIG. 5, the elastic deformation member 381 may be provided between the motor assembly 32 (drive device) and the fixing portion 321 b of the motor assembly 32. The elastic deformation member 381 is formed of an elastic material in an annular shape or a ring shape. When force in the valve opening direction is applied to the valve member 35 that is in contact with the valve seat 312b, the elastic deformation member 381 causes the motor assembly 32 to valve the fixed portion 321b of the motor assembly 32 (that is, the valve housing body 31). The valve member 35 is separated from the valve seat 312b by being elastically deformed so as to move in the axial direction of the shaft 33. As a result, the fluid control valve itself can have a relief function with a simple configuration in which the configuration of the motor assembly 32 is changed.

<Third Embodiment>
Further, for example, as shown in FIG. 6, an elastic deformation member 382 may be provided between the valve housing fixing portion 311g and the valve housing main body 31 (motor mounting boss 311f). Specifically, it may be formed thinner than the fixed portion 311g, or may be formed of an elastic material like the elastic deformation member 381. When a force in the valve opening direction is applied to the valve member 35 in contact with the valve seat 312b, the elastic deformation member 382 is elastically deformed so that the valve housing fixing portion 311g moves in the axial direction with respect to the valve housing body 31. Thus, the valve member 35 is separated from the valve seat 312b. Thereby, the relief function can be given to the fluid control valve itself with a simple configuration in which the configuration of the valve housing body 31 is changed.
Further, the valve member 35 may be provided with an elastic deformation member. For example, what is necessary is just to provide between the sealing lip 352a and the connection part of the valve shaft 33.
Further, the elastically deformable members of the second and third embodiments can also be applied to the air pressure regulating valve 4.

  In the drawings, 3 is a three-way valve (fluid control valve), 4 is an air pressure regulating valve (fluid control valve), 31 and 41 are valve housing bodies, 32 and 42 are motor assemblies (drive devices), and 33 and 44 are valve shafts ( Valve shaft), 35 and 45 are valve members, 36 is a shaft seal (ring-shaped seal member), 311a is a three-way valve inlet (inlet), 312a is a three-way valve outlet (outlet), and 312b is a control valve seat (valve) Seat), 334 and 444 are connecting portions, 334a and 444a are flat surfaces, 335 and 445 are ball holes, 336, 446 and 447 are steel balls, 35 and 45 are valve members (valve bodies), and 351 and 451 are valve frames. , 351a and 451a are flat plate portions, 351b are concave portions, 351c and 451c are cylindrical portions, 351d and 451d are mounting portions, 352 and 452 are seal members, and 352a and 4 2a is a seal lip (seal part), 38, 381, 382 and 48 are elastic deformation members, 411d is a pressure regulating valve inlet (inlet), 411e is a pressure regulating valve outlet (outlet), and 411f is a pressure regulating valve seat (valve seat). , 451b indicate stepped portions.

Claims (7)

A valve housing body in which a flow path having a fluid inlet and an outlet is formed;
A drive device comprising a fixed portion attached to a valve housing fixed portion provided in the valve housing body;
A valve shaft coupled to the output shaft of the drive device and moving axially within the valve housing body;
The valve shaft is attached so as to extend in the radial direction with respect to the axis of the valve shaft, and moves together with the valve shaft to move away from or contact the valve seat formed in the flow passage of the valve housing main body. A valve body that opens and closes;
And the output shaft of the drive device is positioned and fixed at the valve closing position so that the valve body contacts the valve seat and the flow path of the valve housing body is maintained closed. Because
When a force in the valve opening direction is applied to the valve body that is in contact with the valve seat, the force is provided in the middle of a path that transmits the force to the valve housing body via the valve body, the valve shaft, and the driving device. The fluid control valve further comprising an elastic deformation member that is elastically deformed so that the valve body is separated from the valve seat when the force is applied. The elastic deformation member is provided on the valve shaft,
2. The fluid according to claim 1, wherein when a force in the valve opening direction is applied to the valve body in contact with the valve seat, the elastic deformation member is elastically deformed in the axial direction, and the valve body is separated from the valve seat. Control valve. The elastic deformation member is provided between the driving device and a fixed portion of the driving device,
When a force in the valve opening direction is applied to the valve body that is in contact with the valve seat, the elastic deformation member is elastic so that the driving device moves in the axial direction with respect to a fixed portion of the driving device. The fluid control valve according to claim 1, wherein the valve body is deformed to move away from the valve seat. The elastic deformation member is provided between the valve housing fixing portion and the valve housing body,
When a force in the valve opening direction acts on the valve body in contact with the valve seat, the elastic deformation member is elastic so that the valve housing fixing portion moves in the axial direction with respect to the valve housing body. The fluid control valve according to claim 1, wherein the valve body is deformed to move away from the valve seat.   The fluid control valve according to any one of claims 1 to 4, further comprising a seal portion that is formed of an elastic material on at least one of the valve body and the valve seat and seals between the two members.   The fluid control valve according to claim 5, wherein the seal portion is formed in a lip shape in cross section. A diaphragm that moves together with the valve body;
One side of the diaphragm is configured to include the flow path and the valve seat and faces a fluid chamber through which the fluid flows, and the other side of the diaphragm is prohibited from entering the fluid and opened to the atmosphere. Facing the air chamber,
The fluid control valve according to any one of claims 1 to 6, wherein an effective pressure receiving area of the diaphragm is larger than an effective pressure receiving area of the valve body.

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