JP2013087803A - Fluid control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small and inexpensive fluid control valve which can securely generate a sealing force between a valve member and a valve seat in closing a valve.SOLUTION: An air pressure-regulating valve 4 moves the valve member 45 together with a valve shaft 44 in an axial direction in a valve housing 41 by a motor assembly 42. The valve member 45 opens and closes the air pressure-regulating valve 4 by seating and separating with respect to a pressure-regulating valve seat 411f. The valve member 45 includes a valve frame 451 with a seal member 452 mounted, and an attaching part 451d of the valve frame 451 is mounted so as to be tiltable with respect to a connection part 444 of a tip of the valve shaft 44. A ball hole 445 penetrations the connection part 444 so as to be orthogonal to an axial center. A steel ball 446 is arranged rotatably in the ball hole 445 and can move in an axial direction of the ball hole 445. The attaching part 451d is caulked and fixed to the steel ball 446.

Description

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

A poppet valve type on-off valve seated on a perfect circular valve seat is mounted on a valve shaft by vertically mounting a circular valve body in the axial direction together with the valve shaft. Widely used in exhaust valves and the like.
The on-off valve disclosed in Patent Document 1 is provided on the oxidizing gas supply path of the fuel cell system and selectively introduces air into a pair of pressure chambers separated from each other by a diaphragm. Thereby, the valve body connected to the diaphragm is brought into contact with or separated from the valve seat formed on the supply path, thereby intermittently supplying the supply path.
The poppet valve type open / close valve disclosed in this prior art has high resistance to high pressure from one direction when the valve is closed, and can sufficiently seal high-pressure oxidizing gas discharged from the air compressor.

  On the other hand, however, in the above-described poppet valve type on-off valve, due to design or manufacturing errors, there is a variation in accuracy in the parallelism between the planar direction of the valve body and the seal surface of the valve seat. May occur. If there is a variation in accuracy in the parallelism between the valve body that contacts each other and the seal surface of the valve seat, it may lead to a sealing failure of the on-off valve, and measures to avoid this need to be taken. It was.

  To this end, until now, when the valve body is seated on the valve seat, the variation in parallelism between the valve body and the valve seat is partially crushed by the seal member formed of an elastic material. Absorbed. As a result, even if the valve body and the seal surface of the valve seat are not parallel, the seal member comes into contact with the entire surface of the valve seat, thereby preventing a sealing failure of the on-off valve.

  However, the on-off valve as disclosed in Patent Document 1 must allow a predetermined amount of fluid to pass, and the seal member must have a certain seal diameter. Therefore, when the seal diameter increases, it is necessary to increase the crushing margin of the seal member, and it is also necessary to increase the load that presses the valve body. For this reason, the problem that the on-off valve itself will enlarge and cost will generate | occur | produce.

  On the other hand, in the on-off valve disclosed in Patent Document 2, the upper part of the valve body mounting shaft to which the valve body seated on the valve seat is attached and the lower part of the main shaft are inserted in a direction perpendicular to both axes. Connected through the connecting pins. According to this, since the valve body mounting shaft is connected to the main shaft so as to be able to swing, the valve body follows the seal surface of the valve seat even if the main shaft is not perpendicular to the seal surface of the valve seat. The sealing force can be secured between the two.

JP 2008-146924 A Japanese Utility Model Publication No. 62-87275

However, in the on-off valve disclosed in Patent Document 2, the valve body mounting shaft and the main shaft are connected via a connecting pin, and the play between the valve body mounting shaft and the main shaft is not attached to the valve body. Since it is determined by the dimensions of the three parts of the shaft, the main shaft, and the connecting pin, there is a possibility that the play between the two will increase. If the backlash between the valve body mounting shaft and the main shaft is large, the vibration of the valve body and the noise accompanying the vibration increase, and the flow rate also varies in the fluid passing through the on-off valve.
In particular, when the backlash in the axial direction between the valve body mounting shaft and the main shaft is large, hysteresis occurs in the flow rate characteristics of the on-off valve. For this reason, when the on-off valve is used as a fluid control valve for controlling the flow rate of fluid, it is difficult to accurately control the flow rate of fluid.

On the other hand, if the backlash between the valve body mounting shaft and the main shaft is to be reduced, the dimensional accuracy of each component must be improved, and the cost is inevitably increased.
Further, when there is a possibility that moisture or foreign matter may enter the on-off valve, a seal member that covers the entire swing mechanism is required to protect the swing mechanism of the on-off valve from these. For this reason, the on-off valve is further increased in size by the sealing member, which further increases the cost.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a small and low-cost fluid control valve that can reliably generate a sealing force between a valve member and a valve seat when the valve is closed. There is to do.

  In order to solve the above-described problem, the fluid control valve according to a first aspect of the present invention includes a valve housing having a fluid inlet and outlet formed therein, a drive source attached to the valve housing, The valve shaft is moved in the valve housing in the axial direction by the drive source, and is attached so as to extend in the radial direction with respect to the axial center of the valve shaft. A valve member that is seated or spaced apart from the valve seat formed on and formed between the inlet and the outlet, and the valve member has a radial clearance between the valve shaft and the valve shaft. A tubular portion into which the valve shaft is inserted, an extending portion extending radially from the tubular portion to the valve shaft, one end is continuous with the tubular portion or the extending portion, and the other end is closed in a bag shape. , Housed the tip of the valve stem inside And a seal member attached to the extending portion and capable of coming into contact with the valve seat. The portion accommodated in the attachment portion of the valve shaft includes a shaft. A through hole is provided in a direction orthogonal to the center, a rotatable sphere is disposed in the through hole, and the attachment portion is fixed to the sphere by caulking.

  According to a second aspect of the present invention, in the fluid control valve according to the first aspect, the portion where the through hole is formed in the valve shaft is formed to have a smaller diameter than the portion inserted into the cylindrical portion, and the spherical body penetrates. It protrudes from both ends of the hole.

  According to a third aspect of the present invention, in the fluid control valve according to the second aspect, the portion where the through hole is formed in the valve shaft is formed in a two-sided width shape having a pair of flat surfaces facing each other on the outer peripheral surface, Both end portions of the through holes are respectively opened so as to be orthogonal to the opposed flat surfaces.

  According to a fourth aspect of the present invention, there is provided the fluid control valve according to any one of the first to third aspects, wherein a ring-shaped seal member is provided between the outer peripheral surface of the valve shaft and the inner peripheral surface of the cylindrical portion. Is intervening.

  According to the fluid control valve of the first aspect, the valve member has a tubular portion into which the valve shaft is inserted with a radial clearance between the valve member and the valve shaft, and a radius from the tubular portion to the valve shaft. A valve frame having an extending part extending in the direction, and an attachment part in which one end is continuous with the cylindrical part or the extending part and the other end is closed in a bag shape and accommodates the tip of the valve shaft inside. The seal member is attached to the extension portion and can contact the valve seat, and a through-hole is provided in the portion accommodated in the valve shaft attachment portion in a direction perpendicular to the shaft center. In the through hole, a rotatable sphere is arranged, and the mounting portion is fixed to the sphere by caulking so that the parallelism between the planar direction of the valve member and the sealing surface of the valve seat is achieved. When there is a variation in accuracy, the sphere rotates and the valve member is spaced radially from the valve shaft. It can incline to filled, it can be a fluid control valve or to improve the dimensional accuracy of the components without large, to ensure the sealability between the valve member and the valve seat.

In addition, since the axial gap between the valve shaft and the valve member does not increase beyond the gap between the sphere and the through hole, hysteresis is reduced in the flow characteristics of the fluid control valve, and flow control accuracy is improved. Can be improved.
Furthermore, since the mounting portion that accommodates the tip of the valve shaft is formed in a bag shape, the fluid control valve is not enlarged without using a special seal member, and moisture and foreign matter in the mounting portion can be prevented. Infiltration can be reduced.

  According to the fluid control valve of the second aspect, the part where the through hole is formed in the valve shaft is formed with a smaller diameter than the part inserted into the cylindrical part, and the sphere protrudes from both end parts of the through hole. Thus, the attachment portion can be firmly caulked against the sphere without the inner peripheral surface of the attachment portion coming into contact with the valve shaft.

  According to the fluid control valve of the third aspect, the portion where the through hole is formed in the valve shaft is formed in a two-sided width shape having a pair of flat surfaces facing each other on the outer peripheral surface, so A small-diameter portion can be easily formed in the accommodated valve stem.

  According to the fluid control valve of the fourth aspect, the ring-shaped seal member is interposed between the outer peripheral surface of the valve shaft and the inner peripheral surface of the cylindrical portion, so that the sealability of the mounting portion is achieved. Can be further improved, and the penetration of moisture and foreign matter into the mounting portion can be further reduced.

1 is a block diagram showing a fuel cell system according to Embodiment 1 of the present invention. Partial sectional view of the air pressure regulating valve shown in FIG. Partial sectional view of the air pressure regulating valve shown in FIG. 2 when closed FIG. 2 is a simplified sectional view showing an engagement state between an output shaft and a valve shaft of a stepping motor included in the air pressure regulating valve shown in FIG. AA sectional view of FIG. The perspective view which showed the state when inserting a valve shaft in the attachment part of a valve frame Enlarged view for explaining the case where the valve member is inclined in the axial direction of the ball hole Enlarged view for explaining the case where the valve member is inclined to the axial center of the ball hole Sectional drawing for demonstrating the deformation | transformation embodiment of the air pressure regulation valve by Embodiment 1. FIG. Partial sectional view showing a three-way valve according to Embodiment 2 of the present invention Partial sectional view when the bypass valve seat of the three-way valve shown in FIG. 10 is closed Partial sectional view when the control valve seat of the three-way valve shown in FIG. 10 is closed

<Embodiment 1>
Based on FIG. 1 thru | or FIG. 9, the air pressure regulation valve 4 by Embodiment 1 of this invention is demonstrated.

  As shown in FIG. 1, an air pressure regulating valve 4 (corresponding to a fluid control valve) according to the present embodiment is 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. On the fuel system discharge pipe 51b, a gas-liquid separator 54, an exhaust / drain valve 55, and 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 drive source) to the outer peripheral surface of a valve housing 41. 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 this embodiment, the motor assembly 42 using an electric motor is used as a drive source. However, 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.
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.

  As shown in FIG. 4, a stepping motor 422 is fixed to the inner wall of the motor case 421. The tip of the output shaft 422a 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 421c 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 (see FIG. 5). 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. 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.

  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-sided width shape having a pair of flat surfaces 444a (only one surface is shown in FIG. 6) facing each other on the outer peripheral surface. The flat surfaces 444a are connected to each other by a pair of side surface portions 444b (only one surface is shown in FIG. 6) facing each other.

  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 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 self-activates due to the negative pressure generated by the reaction between hydrogen gas and oxygen remaining in the battery stack 6 and condensation of residual water vapor due to the temperature drop of the battery stack 6 when power generation is stopped. It is formed inward in the radial direction (toward the pressure regulating valve outlet 411e) so as to be sealed.

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.

  As shown in FIG. 6, the attachment portion 451 d has a pair of fixed walls 451 e so as to face the flat surface 444 a 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 451g so as to connect the fixed walls 451e.

The distance between the inner peripheral surfaces of both fixed walls 451e is larger than the distance between the flat surfaces 444a of the connecting portion 444 (thickness of the two surfaces), and the distance between the inner peripheral surfaces of both connecting surface portions 451g is The distance between the side surface portions 444b of the portion 444 is set to be larger.
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 (shown in FIG. 6). 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 (shown in FIG. 7).

When the connecting portion 444 is inserted into the mounting portion 451d, the steel ball 446 is positioned by the fitting portion 451f, so that the connecting portion 444 can be smoothly inserted into the mounting portion 451d. As shown in FIG. 7, the caulking with respect to the steel ball 446 is performed at two upper and lower portions in the opening of the ball hole 445. After caulking the fixed wall 451e, the steel ball 446 functions as a retaining member for the valve shaft 44 from the valve member 45.
As shown in FIG. 7, in a state where the valve frame 451 is attached to the valve shaft 44, there is only a slight gap in the axial direction between the steel ball 446 and the ball hole 445 of the connecting portion 444. There is no substantial play between the two in the vertical direction in FIG.

  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. As shown in FIG. 7, the radial gap ε is formed over the entire circumference between the inner peripheral surface of the cylindrical portion 451 c 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.

When the valve member 45 attached to the valve shaft 44 is inclined in the penetrating direction of the ball hole 445 (clockwise or counterclockwise in FIG. 7), the steel ball 446 integrated with the valve frame 451 is And can move in the ball hole 445 to the left and right in the axial direction of the ball hole 445.
Therefore, when the valve member 45 is tilted to the left in FIG. 7, the lower side of the inner peripheral surface of the valve frame 451 is in contact with the left corner (left end) of the lower end portion of the connecting portion 444, and the inner right side of the cylindrical portion 451 c It can be tilted to the left until the gap ε between the peripheral surface and the right outer peripheral surface of the cylindrical portion 443 is filled (indicated by a broken line in FIG. 7).

Further, when the valve member 45 is tilted to the right in FIG. 7, the lower side of the inner peripheral surface of the valve frame 451 is in contact with the right corner (right end) of the lower end portion of the connecting portion 444 and the left side of the cylindrical portion 451 c. It can be tilted to the right until the gap ε between the inner peripheral surface and the left outer peripheral surface of the cylindrical portion 443 is filled (indicated by a two-dot chain line in FIG. 7).
Therefore, when the valve member 45 is tilted in the left-right direction in FIG. 7, the maximum tilt angle of the valve member 45 is restricted based on the radius of rotation ε and the turning radius around the corner of the lower end of the connecting portion 444.

  On the other hand, when the valve member 45 is inclined in the direction in which the flat surface 444a of the connecting portion 444 extends (clockwise or counterclockwise in FIG. 8), the valve member 45 rotates around the axis of the ball hole 445 (the center of the steel ball 446). can do. That is, the steel ball 446 integrated with the valve frame 451 rotates in the ball hole 445 until the gap ε between the inner peripheral surface of the cylindrical portion 451c and the outer peripheral surface of the column portion 443 is filled. The member 45 is inclined to the left and right (indicated by a broken line and a two-dot chain line in FIG. 8). Therefore, in this case, the maximum inclination angle of the valve member 45 is restricted based on the radius of rotation ε around the radial gap ε and the axis of the ball hole 445.

As described above, the tilt angle of the valve member 45 with respect to the valve shaft 44 is regulated by the radial gap ε regardless of which direction is tilted.
The size of the radial clearance ε follows the pressure regulating valve seat 411f so that the valve member 45 can be sealed with respect to the valve shaft 44 so that the valve member 45 can be sealed when seated on the pressure regulating valve seat 411f of the valve body 411. It is set based on the diameter of the seal portion with respect to the pressure regulating valve seat 411f of the seal member 452 so as to be inclined by a predetermined amount.

  Returning to 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.

  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 on the upper side and the seal member 452 of the valve member 45 is separated from the pressure regulating valve seat 411f, the air pressure regulating valve 4 is in an open state (shown in FIG. 2). 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 on the pressure regulating valve seat 411f (shown in FIG. 3). 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.

  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.

  According to the present embodiment, the valve member 45 has a cylindrical portion 451 c into which the valve shaft 44 is inserted with a radial clearance ε between the valve shaft 44 and a radius from the cylindrical portion 451 c to the valve shaft 44. A valve frame 451 having a flat plate portion 451a extending in the direction, a mounting portion 451d having one end continuous with the cylindrical portion 451c, the other end closed in a bag shape, and accommodating the tip of the valve shaft 44 inside, and a flat plate The connecting portion 444 is a portion that is attached to cover the outer peripheral surface of the portion 451a and is formed by a seal member 452 that can come into contact with the pressure regulating valve seat 411f. Is provided with a ball hole 445 in a direction perpendicular to the axis, and a rotatable steel ball 446 is disposed in the ball hole 445, and the mounting portion 4 Since 1d is fixed to the steel ball 446 by caulking, if the parallelism between the planar direction of the valve member 451 and the seal surface of the pressure regulating valve seat 411f has a variation in accuracy, the steel ball 446 is By rotating, the valve member 451 can be tilted with respect to the valve shaft 44 until the radial gap is filled, and without increasing the dimensional accuracy of the component parts or increasing the size of the air pressure regulating valve 4, The sealing property between the pressure regulating valve seat 411f can be ensured.

Further, since the axial gap between the valve shaft 44 and the valve member 451 does not increase beyond the gap between the steel ball 446 and the ball hole 445, hysteresis is reduced in the flow characteristics of the air pressure regulating valve 4. The accuracy of flow control can be improved.
In addition, the valve member 45 regularly tilts around the center of the steel ball 446 or the lower end of the connecting portion 444 and does not tilt beyond a predetermined angle regulated by the radial gap ε. The accompanying noise generation is prevented, the flow rate fluctuation of the air passing through the inside of the air pressure regulating valve 4 can be reduced, and the flow rate control performance of the air pressure regulating valve 4 can be improved.
Further, by inserting the connecting portion 444 of the valve shaft 44 and then caulking the mounting portion 451d to connect the valve member 45 and the valve shaft 44, the valve member 45 can be reduced by a predetermined amount with a simple configuration at a low cost. The air pressure regulating valve 4 that can be tilted with respect to the shaft 44 can be formed.

  In addition, since the mounting portion 451d that accommodates the tip of the valve shaft 44 is formed in a bag shape, the air pressure regulating valve 4 is not enlarged without using a special seal member, and the mounting portion 451d is moved into the mounting portion 451d. Intrusion of moisture and foreign matter can be reduced. In particular, in the vehicle, when the air pressure regulating valve 4 is mounted in the vertical direction as shown in FIG. 2, it is possible to sufficiently prevent the entry of water or the like into the mounting portion 451d from below.

  Further, the connecting portion 444 in which the ball hole 445 is formed in the valve shaft 44 is formed to have a smaller diameter than the column portion 443 inserted into the cylindrical portion 451c, and the steel balls 446 protrude from both end portions of the ball hole 445. Accordingly, the attachment portion 451d can be firmly caulked against the steel ball 446 without the inner peripheral surface of the attachment portion 451d coming into contact with the valve shaft 44.

In addition, the connecting portion 444 is formed in a two-sided width shape having a pair of flat surfaces 444a facing each other on the outer peripheral surface, so that a small-diameter portion can be easily formed on the valve shaft 44 accommodated in the mounting portion 451d. Can be formed.
Further, when the valve member 45 is attached to the valve shaft 44, the connecting portion 444 is inserted into the attachment portion 451d in a state where the steel ball 446 is disposed in the ball hole 445, so that the air pressure regulating valve 4 having good assembling workability is obtained. can do.

Further, since the tilt mechanism of the valve member 45 is formed by the steel balls 446 and the ball holes 445, the tilt mechanism itself can be reduced in size.
Further, since the driving force of the motor assembly 42 is transmitted to the valve member 45 through the contact point between the steel ball 446 and the ball hole 445, the load transmitting portion is always at a fixed location, so that the valve member 45 is When the fluid is blocked by pressing against the pressure regulating valve seat 411f, more stable sealing performance can be obtained.

  Next, a modified embodiment of the first embodiment will be described based on FIG. In the description, the same components as those of the air pressure regulating valve 4 according to the first embodiment will be described using the same reference numerals. Also in this modified embodiment, as in the case of the first embodiment, a ball hole 445 passes through the connecting portion 444 in a direction perpendicular to the axis, and a steel ball 447 (corresponding to a sphere) is inserted in the ball hole 445. To be arranged). The diameter of the steel ball 447 is slightly smaller than the diameter of the ball hole 445. The steel ball 447 is accommodated in the ball hole 445 so as to be rotatable and movable in the axial direction of the ball hole 445. Yes. However, the diameter of the steel balls 447 is set to be smaller than the distance between the flat surfaces 444a (thickness of the two surfaces), and the steel balls 447 do not protrude from both ends of the ball hole 445.

On the other hand, the valve frame 451 has an attachment portion 451d that can accommodate the connecting portion 444 of the valve shaft 44 by closing the tip in a bag shape, as in the case of the first embodiment. In the case of this modified embodiment, the fitting part 451f is not formed on both the fixed walls 451e.
When the valve member 451 is attached to the valve shaft 44, the connecting portion 444 is inserted into the attachment portion 451d in a state where the steel ball 447 is accommodated in the ball hole 445. Thereafter, both the fixing walls 451 e are inserted into the ball holes 445 and caulked against the steel balls 447, whereby the attachment portions 451 d are fixed to the steel balls 447. In the case of this modified embodiment, the caulking portion 451h is formed at only one place on both the fixed walls 451e.
Also in this modified embodiment, the valve member 45 can be inclined with respect to the valve shaft 44 based on the radial gap ε between the cylindrical portion 451c of the valve frame 451 and the columnar portion 443 of the valve shaft 44. Needless to say.

<Embodiment 2>
Next, the structure of the three-way valve 3 (corresponding to a fluid control valve) according to Embodiment 2 to which the present invention is applied will be described in detail with reference to FIGS. In the following description, the upper and lower portions in FIG. 10 are described as the upper and lower portions of the three-way valve 3, respectively, and the right and left portions in FIG. 10 are described as the right and left sides of the three-way valve 3, respectively. This is independent of the actual mounting direction of the three-way valve 3 in FIG.

  As shown in FIG. 10, the three-way valve 3 is also formed by attaching a motor assembly 32 (corresponding to a drive source) to the outer peripheral surface of the valve housing 31, similarly to the air pressure regulating valve 4 according to the first embodiment. The valve housing 31 is formed by fitting a first body 311 and a second body 312, both of which are made of a synthetic resin material such as polyphenylene sulfide, in a liquid-tight manner.

  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 an outlet) that opens in a direction perpendicular to the three-way valve inlet 311a (opens downward in FIG. 10). 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 according to the first embodiment, the above-described motor assembly 32 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. A plurality of mounting screws (not shown) that are not shown are fastened to the first body 311 by being fastened to the first body 311. The mounting screw is loosely fitted in a through hole (not shown) formed in the motor case 321. In the motor assembly 32, the outer peripheral surface of the mechanism housing portion 321a abuts on the inner peripheral surface of the motor mounting boss 311f. Thus, the positioning is performed.

  Similar to the air pressure regulating valve 4, a stepping motor 422 is fixed in the motor case 321, and the rotational motion of the output shaft 422 a of the stepping motor 422 is converted into linear motion, and the valve shaft 33 (corresponding to the valve shaft). ). 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.

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 according to the first embodiment.

Similar to the air pressure regulating valve 4, a valve member 35 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 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. 10, the seal lip 352a is formed outward in the radial direction 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. 10, 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 reference numerals are omitted for the same configurations as the air pressure regulating valve 4.

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 of the cylindrical portion 331 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 on the bypass valve seat 311d and is separated from the control valve seat 312b (shown in FIG. 11). 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. 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 seated on the control valve seat 312b (shown in FIG. 12). 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. 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 rate of each flow can be controlled based on the cross-sectional area of the passage through which the fluid passes (shown in FIG. 10).

  According to the present embodiment, the ring-shaped shaft seal 36 is interposed between the outer peripheral surface of the valve shaft 33 and the inner peripheral surface of the cylindrical portion 351c, thereby further improving the sealing performance of the mounting portion 351d. Thus, it is possible to further reduce the intrusion of moisture and foreign matter into the mounting portion 351d.

<Other embodiments>
The present invention is not limited to the above-described embodiments, and can be modified or expanded as follows.
By elastically interposing a seal member between the inner peripheral surface of the valve frame 451 of the air pressure regulating valve 4 and the outer peripheral surface of the valve shaft 44, utilizing the sliding resistance generated between the two, The valve member 45 is held (centering) around the axis of the valve shaft 44, and the vibration of the valve member 45 with respect to the valve shaft 44 and the noise accompanying the vibration can be reduced.

Further, in the modified embodiment of the first embodiment, the cross-sectional shape of the connecting portion 444 may be a perfect circle having the same diameter as the cylindrical portion 443 without making the connecting portion 444 smaller in diameter than the cylindrical portion 443.
Further, in the valve members 35 and 45 shown in FIGS. 2 and 10, flat plate portions 351a and 451a are formed below the cylindrical portions 351c and 451c, and further, flat plate portions 351a and 451a are formed below the flat plate portions 351a and 451a. The attachment portions 351d and 451d may be formed so as to be continuous with each other.

  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 housings, 32 and 42 are motor assemblies (drive sources), and 33 and 44 are valve shafts (valves). Shafts 35, 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), 312b is a control valve seat (valve seat) , 334, 444 are connecting portions (portions accommodated in the mounting portion), 334a, 444a are flat surfaces, 335, 445 are ball holes (through holes), 336, 446, 447 are steel balls (spheres), 351, 451 is a valve frame, 351a and 451a are flat plate portions (extending portions), 351b is a concave portion (extending portion), 351c and 451c are cylindrical portions (tubular portions), 351d and 451d are mounting portions, 3 2, 452 are seal members, 411d is a pressure regulating valve inlet (inlet), 411e is a pressure regulating valve outlet (outlet), 411f is a pressure regulating valve seat (valve seat), and 451b is a stepped portion (extending portion). .

Claims (4)

A valve housing having a fluid inlet and outlet formed therein;
A drive source attached to the valve housing;
A valve shaft that moves axially in the valve housing by the drive source;
It is attached so as to extend in the radial direction with respect to the axial center of the valve shaft, and moves along with the valve shaft so as to be seated or separated from the valve seat formed in the valve housing on one side surface, A valve member for intermittently connecting between the inlet and the outlet;
With
The valve member is
A tubular portion into which the valve shaft is inserted with a radial clearance between the valve shaft, an extending portion extending in a radial direction from the tubular portion to the valve shaft, and one end of the tubular portion A valve frame having a mounting portion that is continuous with the cylindrical portion or the extending portion, has the other end closed in a bag shape, and houses the tip of the valve shaft inside;
A seal member attached to the extension portion and capable of contacting the valve seat;
Formed by
The part accommodated in the mounting portion of the valve shaft is provided with a through hole in a direction perpendicular to the axis, and a rotatable sphere is disposed in the through hole.
The attachment portion is a fluid control valve fixed to the sphere by caulking.   2. The fluid according to claim 1, wherein a portion of the valve shaft in which the through hole is formed is formed with a smaller diameter than a portion inserted into the cylindrical portion, and the sphere protrudes from both end portions of the through hole. Control valve.   The portion of the valve shaft where the through hole is formed is formed in a two-sided width shape having a pair of flat surfaces facing each other on the outer peripheral surface, and both end portions of the through hole are orthogonal to the facing flat surface. The fluid control valve according to claim 2, wherein each of the fluid control valves is opened.   The fluid control valve according to any one of claims 1 to 3, wherein a ring-shaped seal member is interposed between an outer peripheral surface of the valve shaft and an inner peripheral surface of the tubular portion. .

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