JP6772780B2 - Fluid control valve - Google Patents

Description

The present invention relates to a fluid control valve.

The fluid control valve (gas body control valve 2) disclosed in Patent Document 1 is provided on the oxidant gas supply path of the fuel cell system, as shown in FIG. 1 of Patent Document 1. As shown in FIG. 2 of Patent Document 1, this fluid control valve includes a casing 4, a first valve seat 30, a second valve seat 34, a valve body 6, and a drive device 8. The casing 4 is formed with an inflow passage 12, a first outflow passage 16, and a second outflow passage 20. The first valve seat 30 is formed between the inflow passage 12 and the first outflow passage 16. The second valve seat 34 is formed between the inflow passage 12 and the second outflow passage 20. The valve body 6 is in contact with and separated from the first valve seat 30 and the second valve seat 34. The drive device 8 holds the valve body 6 between the first closed position where the valve body 6 and the first valve seat 30 abut and the second closed position where the valve body 6 and the second valve seat 34 abut. It is something to move.

Japanese Patent No. 5720176

In the fluid control valve of Patent Document 1 described above, when the valve body 6 is located at the first closed position and the first valve seat 30 and the valve body 6 are in contact with each other, the inflow passage 12 When the differential pressure between the valve body 6 and the first outflow passage 16 is relatively large, the valve opening force, which is the force that separates the valve body 6 in the valve closed state and the first valve seat 30 to open the valve, becomes relatively large. .. On the other hand, making the output of the drive device 8 larger than the valve opening force leads to an increase in size and cost of the drive device and thus the fluid control valve. Further, limiting the pressure range of the fluid to which the fluid control valve can be applied in order to suppress the above-mentioned differential pressure causes a decrease in the convenience of the fluid control valve.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to suppress a valve opening force in a fluid control valve.

In order to solve the above problem, the fluid control valve according to claim 1 is arranged in a housing provided with a valve chamber for flowing a fluid inside and a valve chamber, and is different from the first position and the first position. A valve body provided so as to be movable along the first direction between positions, a drive device for driving the valve body to move, and a valve body arranged so as to penetrate along the first direction. A diaphragm that is provided in a film shape that bends according to the movement of the valve body and is arranged so as to partition the valve chamber into a first fluid chamber and a second fluid chamber, and an introduction that introduces a fluid into the first fluid chamber. When the valve body is located in the first position, which is provided in the port, the first outlet for drawing out the fluid from the first fluid chamber, and the first fluid chamber, it comes into contact with the valve body to be the first from the introduction port. The first valve seat that regulates the introduction of fluid into the fluid chamber is provided on the valve body, and when the valve body is located in the first position, the introduction port and the second fluid chamber are connected, and the valve body is the second. A connecting path connecting the first fluid chamber and the second fluid chamber when located at a position, a second outlet for drawing a fluid from the second fluid chamber, and a valve body provided in the second fluid chamber are provided. When located in two positions, it is provided with a connecting path and a second valve seat that regulates the outflow of fluid from the second fluid chamber to the second outlet by contacting the valve body.

According to this, when the valve body is in the first position and the first valve seat and the valve body are in contact with each other in the valve closed state, the introduction port is provided through the connection path provided in the valve body. The fluid supplied from is led out to the second fluid chamber. Therefore, the force acting on the valve body due to the differential pressure between the pressure of the fluid in the inlet and the pressure of the fluid in the first fluid chamber is the pressure of the fluid in the second fluid chamber and the pressure of the fluid in the first fluid chamber. The differential pressure is suppressed by the force acting on the diaphragm and thus the valve body. Therefore, in this case, it is possible to suppress the valve opening force, which is the force that separates the first valve seat in the valve closed state from the valve body to open the valve.

It is a schematic diagram of the fuel cell system using the fluid control valve which concerns on 1st Embodiment of this invention. It is a partial cross-sectional view which shows the fluid control valve shown in FIG. 1, and shows the state which the valve body is located in the 1st position. It is a partial enlarged view around the valve body of the fluid control valve shown in FIG. FIG. 2 is a partial cross-sectional view of the fluid control valve shown in FIG. 2, showing a state in which the valve body is located between the first position and the second position. It is a partial cross-sectional view of the fluid control valve shown in FIG. 2, and shows the state in which the valve body is located at the second position. It is a partial sectional view of the fluid control valve which concerns on 2nd Embodiment of this invention. It is a partial sectional view of the fluid control valve which concerns on 3rd Embodiment of this invention. It is a partial sectional view of the fluid control valve which concerns on 4th Embodiment of this invention. It is a partial sectional view of the fluid control valve which concerns on 5th Embodiment of this invention.

<First Embodiment>
Hereinafter, the fluid control valve according to the first embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the fluid control valve is applied as a three-way valve 3 to the oxygen system 2 of the fuel cell system 1 mounted on the vehicle. The fuel cell system 1 includes an oxygen system 2, a fuel system 5, a fuel cell 6, a power system 7, a cooling system 8, and a control device 9.

The fuel cell 6 is provided by laminating a plurality of solid polymer type single cells, although the fuel cell 6 is not limited to this. A plurality of single cells are electrically connected in series. Each single cell contains an electrolyte membrane and an anode and cathode pole (neither shown) that sandwich it. Further, the anode separator (not shown) of the single cell is provided with an anode flow path 61 for supplying hydrogen gas to the anode electrode. The cathode separator (not shown) is provided with a cathode flow path 62 for supplying air (corresponding to the fluid of the present invention) to the cathode electrode.

The oxygen system 2 includes an oxygen system supply pipe 21a and an oxygen system discharge pipe 21b. The first end of the oxygen system supply pipe 21a is open toward the outside of the fuel cell system. The second end of the oxygen system supply pipe 21a is connected to the first end of the cathode flow path 62 in the fuel cell 6. An air filter 22, an air compressor 23, an intercooler 24, and a three-way valve 3 are arranged in this order from the first end toward the fuel cell 6 on the oxygen system supply pipe 21a. The three-way valve 3 is a three-port fluid control valve. Details of the three-way valve 3 will be described later.

The second end of the cathode flow path 62 is connected to the first end of the oxygen system discharge pipe 21b. An air pressure regulating valve 4, which is a two-port fluid control valve, is arranged on the oxygen-based discharge pipe 21b. Further, the first end of the bypass pipe 21c is connected to the above-mentioned three-way valve 3. The second end of the bypass pipe 21c is connected to a portion of the oxygen system discharge pipe 21b on the downstream side (the side to which the fuel cell 6 is not connected) of the air pressure regulating valve 4.

In the fuel system 5, a hydrogen tank 52 is connected to the first end of the fuel system supply pipe 51a. A shutoff valve 53 is arranged on the fuel system supply pipe 51a. The second end of the fuel system supply pipe 51a is connected to the first end of the anode flow path 61 in the fuel cell 6. A fuel system discharge pipe 51b is connected to the second end of the anode flow path 61.

A gas-liquid separator 54, an exhaust drain valve 55, and an exhaust gas diluter 56 are arranged on the fuel system discharge pipe 51b in order from the side closer to the fuel cell 6. The second end of the oxygen-based discharge pipe 21b described above is connected to the exhaust gas diluter 56.

Further, the gas-liquid separator 54 is connected to a portion on the fuel system supply pipe 51a between the shutoff valve 53 and the connection portion between the anode flow path 61 via the fuel system circulation path 51c. A circulation pump 57 is arranged on the fuel system circulation path 51c. The circulation pump 57 circulates hydrogen gas from the gas-liquid separator 54 toward the anode flow path 61.

The power system 7 includes an electric motor 71 for traveling the vehicle. The electric motor 71 is connected to the positive electrode and the negative electrode of the fuel cell 6 and is driven by the power generation of the fuel cell 6.
The cooling system 8 includes a water cooling pump 81. The cooling system 8 cools the fuel cell 6 by circulating cooling water in the fuel cell 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 water cooling pump 81. The control device 9 controls the operation of each of these components based on the required power generation amount of the fuel cell 6 calculated according to the traveling state of the vehicle.

According to the above configuration, when the vehicle starts operation, the control device 9 operates the air compressor 23 to supply air to the cathode flow path 62, and also operates the shutoff valve 53 and the circulation pump 57 to operate hydrogen to the anode flow path 61. Supply gas. As a result, power is generated in the fuel cell 6.

In the oxygen system 2, the oxygen-containing air 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 body 33, which will be described later, by a control command from the control device 9 based on the amount of power generated by the fuel cell 6, diverts the air supplied from the intercooler 24, and releases it to the bypass pipe 21c. Thereby, the flow rate of air to the fuel cell 6 is controlled.
Further, the air pressure regulating valve 4 controls the pressure in the fuel cell 6 by adjusting its opening degree and adjusting the amount of air discharged remaining in the fuel cell 6.

The hydrogen off gas (fuel gas off gas) discharged from the anode flow path 61 includes hydrogen gas not 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 to the fuel system supply pipe 51a via the fuel system circulation path 51c by the circulation pump 57 and circulated.

On the other hand, the water (liquid) separated by the gas-liquid separator 54 is sent to the exhaust gas diluter 56 together with the 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 discharge pipe 21b in the exhaust gas diluter 56, and then discharged to the outside together with water. To.

Next, the three-way valve 3 will be described in detail. In the present specification, for the sake of simplicity, the upper side and the lower side in FIG. 2 are the upper side and the lower side of the three-way valve 3, respectively, and the right side and the left side in FIG. 2 are the right side of the three-way valve 3, respectively. It will be described as one and the left. These directions are independent of the actual mounting direction of the three-way valve 3 in the vehicle.
As shown in FIG. 2, the three-way valve 3 includes a housing 31, a drive device 32, a valve body 33, a spring 34, and a diaphragm 35.

The housing 31 is provided with a valve chamber 31c inside. The housing 31 is made of a synthetic resin material such as polyphenylene sulfide. The housing 31 includes a first housing 31a and a second housing 31b. The first housing 31a constitutes the lower side of the housing 31. The second housing 31b constitutes the upper side of the housing 31. The first housing 31a and the second housing 31b are connected by, for example, screws or the like. The housing 31 includes a valve chamber 31c, an introduction port 31d, a first outlet 31e, a second outlet 31f, a first valve seat 31g, a second valve seat 31h, and a shaft retainer portion 31i.

The valve chamber 31c is provided inside the housing 31 and allows air to flow through. The valve chamber 31c is formed by combining a recess 31a1 provided in the first housing 31a that opens upward and a recess 31b1 provided in the second housing 31b that opens downward. The valve chamber 31c is provided in a rectangular cross section. The valve chamber 31c is partitioned by a diaphragm 35 into a first fluid chamber 31c1 on the first housing 31a side (lower side) and a second fluid chamber 31c2 on the second housing 31b side (upper side).

The introduction port 31d introduces air into the first fluid chamber 31c1. The introduction port 31d is connected to the intercooler 24 via the oxygen system supply pipe 21a (see FIG. 1). The introduction port 31d is provided in the first housing 31a. The introduction port 31d introduces air into the first fluid chamber 31c1 from below.

The first outlet 31e derives air from the first fluid chamber 31c1. The first outlet 31e is connected to the fuel cell 6 via the oxygen system supply pipe 21a (see FIG. 1). The first outlet 31e is provided in the first housing 31a. The first outlet 31e derives air from the first fluid chamber 31c1 toward the right.

The second outlet 31f derives air from the second fluid chamber 31c2. The second outlet 31f is connected to the exhaust gas diluter 56 via the bypass pipe 21c and the oxygen system discharge pipe 21b (see FIG. 1). The second outlet 31f is provided in the second housing 31b. The second outlet 31f leads air out from the second fluid chamber 31c2 toward the left.

The first valve seat 31g is provided in the first fluid chamber 31c1 so as to be in contact with the valve body 33. Specifically, the first valve seat 31g is provided in a flat annular shape on the peripheral surface of the opening of the introduction port 31d on the lower side surface of the first fluid chamber 31c1. When the valve body 33 is located at the first position P1, the first valve seat 31g regulates the introduction of air from the introduction port 31d into the first fluid chamber 31c1 by coming into contact with the valve body 33 (details will be described later). To do).

The second valve seat 31h is provided in the second fluid chamber 31c2 so as to be in contact with the valve body 33. Specifically, the second valve seat 31h is provided in a flat annular shape at the opening of the tubular portion 31b2 that opens downward in the second fluid chamber 31c2. The tubular portion 31b2 is provided so as to project downward from the upper side wall of the second housing 31b into the second fluid chamber 31c2.

Further, the upper portion of the tubular portion 31b2 is provided so that the inside of the tubular portion 31b2 and the second outlet 31f are connected to each other. That is, the second outlet 31f is connected to the second fluid chamber 31c2 via the tubular portion 31b2. When the valve body 33 is located at the second position P2 (see FIG. 5), the second valve seat 31h comes into contact with the valve body 33 to contact the connecting path 33f (described later) and the second fluid chamber 31c2 to the second. The derivation of air to the outlet 31f is regulated (details will be described later).

The shaft retainer portion 31i is provided inside the tubular portion 31b2 in a tubular shape coaxially with the tubular portion 31b2. The shaft retainer portion 31i holds the valve shaft 32c, which will be described later, so as to be movable along the first direction (vertical direction in the first embodiment) (details will be described later).

The drive device 32 drives the valve body 33 so as to move it. The drive device 32 moves the valve body 33 along the first direction. The drive device 32 is arranged above the second housing 31b. The drive device 32 includes a casing 32a, a motor 32b, and a columnar valve shaft 32c.

The casing 32a is attached to the upper side of the second housing 31b with screws or the like. The casing 32a includes a housing portion 32a1 and a shaft guide portion 32a2.
The accommodating portion 32a1 is hollowly provided so as to accommodate the motor 32b inside.

The shaft guide portion 32a2 guides the valve shaft 32c so as to move along the first direction. The shaft guide portion 32a2 is provided in a tubular shape that projects downward from the accommodating portion 32a1. The shaft guide portion 32a2 is arranged coaxially with the shaft retainer portion 31i. A rotation restricting portion (not shown) is provided on the lower side of the shaft guide portion 32a2. The rotation regulation unit regulates the rotation of the valve shaft 32c with respect to the casing 32a (details will be described later). The rotation restricting portion is formed by facing surfaces (not shown) which are a pair of planes facing each other with a predetermined width.

The motor 32b is arranged inside the accommodating portion 32a1 so that the output shaft 32b1 extends downward along the first direction. The motor 32b is a stepping motor. The output shaft 32b1 of the motor 32b is provided with a drive hole 32b2 that opens downward so as to be coaxial with the shaft guide portion 32a2. A female screw having a predetermined length is formed inside the drive hole 32b2. The predetermined length is set to be longer than the movement amount of the valve body 33 described later.

The valve shaft 32c is provided in a columnar shape, and is arranged coaxially with the shaft guide portion 32a2 so as to extend along the first direction. The valve shaft 32c is made of a metal material such as stainless steel. The valve shaft 32c includes a male screw portion 32c1, a width across flats 32c2, a cylindrical portion 32c3, a first groove portion 32c4, a second groove portion 32c5, and a connecting portion 32c6 in this order from the upper side to the lower side.

The male screw portion 32c1 is a portion provided on the outer peripheral surface of the valve shaft 32c and formed with a male screw to be connected to the female screw formed in the drive hole 32b2 of the output shaft 32b1. Both the male screw of the male screw portion 32c1 and the female screw of the drive hole 32b2 are formed by trapezoidal screws. Further, the male screw of the male screw portion 32c1 and the female screw of the drive hole 32b2 are set so that the reverse efficiency between the valve shaft 32c and the output shaft 32b1 becomes zero.

As a result, the transmission of the operation between the valve shaft 32c and the output shaft 32b1 is irreversibly formed. Therefore, for example, when the valve body 33 located at the first position P1 is in contact with the first valve seat 31g and a return load is applied from the valve shaft 32c toward the output shaft 32b1, the output shaft 32b1 is moved. The valve body 33 does not rotate in the direction of moving upward from the first position P1.

The width across flats portion 32c2 is a portion formed in a width across flats, which is two planes, facing each other on the facing surfaces of the rotation restricting portion. Since the width across flats 32c2 is restricted from rotating with respect to the shaft guide portion 32a2 by the rotation restricting portion and the male screw portion 32c1 is coupled to the female screw, when the output shaft 32b1 rotates in one direction, the valve shaft 32c Moves upward along the first direction. On the other hand, when the output shaft 32b1 rotates in the other direction opposite to one direction, the valve shaft 32c moves downward along the first direction.

The columnar portion 32c3 is formed in a columnar shape extending along the first direction. The outer peripheral surface of the cylindrical portion 32c3 is slidably provided on the upper side with the inner peripheral surface of the shaft retainer portion 31i along the first direction.

The first groove portion 32c4 and the second groove portion 32c5 are grooves provided on the outer surface of the cylindrical portion 32c3 in an annular shape along the circumferential direction. O-rings R1 and R2 are arranged in the first groove portion 32c4 and the second groove portion 32c5. The O-ring R1 arranged in the first groove portion 32c4 seals between the cylindrical portion 32c3 and the shaft retainer portion 31i in an airtight and liquidtight manner. As a result, the intrusion of air, water, etc. into the shaft retainer portion 31i and thus into the accommodating portion 32a1 is suppressed.

The O-ring R2 arranged in the second groove portion 32c5 hermetically and liquid-tightly seals between the cylindrical portion 32c3 and the medium diameter portion 33b2 of the shaft mounting portion 33b described later. As a result, the infiltration of air, water, etc. into the medium diameter portion 33b2 and thus to the connecting portion 32c6 is suppressed.

The connecting portion 32c6 is provided at the lower end portion of the valve shaft 32c and is a portion to be connected to the valve body 33. The connecting portion 32c6 is formed in a width across flat shape having a pair of flat surfaces 32c7 facing each other on the outer peripheral surface. Further, the connecting portion 32c6 is formed with a ball hole 32c8 orthogonal to the first direction. The ball holes 32c8 penetrate the connecting portion 32c6 so as to open at right angles to the pair of flat surfaces 32c7.

A steel ball 32d is arranged in the ball hole 32c8. The diameter of the steel balls 32d is set to be larger than the distance between the pair of flat surfaces 32c7 (thickness of the width across flats), and the steel balls 32d project from both ends of the ball holes 32c8. Further, the diameter of the steel ball 32d is slightly smaller than the diameter of the ball hole 32c8, and the steel ball 32d can be rotated in the ball hole 32c8 and can be moved in the ball hole 32c8 in the axial direction of the ball hole 32c8. Has been done.

The valve body 33 is arranged in the valve chamber 31c and is provided so as to be movable along the first direction between the first position P1 and the second position P2 different from the first position P1. The first position P1 is the position of the valve body 33 where the valve body 33 and the first valve seat 31g come into contact with each other. The second position P2 is the position of the valve body 33 in which the valve body 33 and the second valve seat 31h come into contact with each other (see FIG. 5). The second position P2 is located above the first position P1 along the first direction. As shown in FIG. 3, the valve body 33 includes a main body portion 33a, a shaft mounting portion 33b, a first seal portion 33c, a second seal portion 33d, and a diaphragm holding portion 33e.

The main body 33a is provided in a tubular shape with the first direction as the axial direction, and has a first opening 33a1 that opens to the first fluid chamber 31c1 side at the first end (lower end) and a second end (upper end). A second opening 33a2 that opens on the side of the second fluid chamber 31c2 is provided. The main body 33a is made of a synthetic resin material such as polyphenylene sulfide. Further, the main body portion 33a includes a flange portion 33a3 and an inner wall portion 33a4.
The flange portion 33a3 is formed on the peripheral edge portion of the first opening 33a1 in a flange shape that protrudes outward in the radial direction over the entire circumference.

The inner wall portion 33a4 is a side wall provided inside the main body portion 33a and provided so as to partition the inside of the main body portion 33a into an upper side and a lower side. The inner wall portion 33a4 includes a tubular wall portion 33a5 and a connecting wall portion 33a6.

The tubular wall portion 33a5 is a bottomed one formed in a tubular shape that opens toward the second opening 33a2 side. When the valve body 33 is located at the second position P2 (see FIG. 5), the peripheral side wall of the tubular wall portion 33a5 is provided so as to be located radially outside the peripheral side wall of the tubular portion 31b2. A plurality of communication holes 33a7 for communicating the first opening 33a1 and the second opening 33a2 are provided on the peripheral side wall of the cylinder wall portion 33a5. Further, the bottom wall of the tubular wall portion 33a5 is provided with a through hole 33a8 penetrating along the first direction.

Since each of the plurality of communication holes 33a7 is provided on the peripheral side wall of the tubular wall portion 33a5, air flows in a direction intersecting the first direction (see the arrow in FIG. 2). The total value of the flow path cross-sectional areas (opening areas) of the communication holes 33a7 is set to be larger than the minimum value of the flow path cross-sectional area between the second fluid chamber 31c2 and the second outlet 31f. There is.

The connection wall portion 33a6 connects a part of the peripheral side wall of the tubular wall portion 33a5 (the upper end portion in the first embodiment) and a part of the peripheral side wall of the main body portion 33a over the entire circumference. As will be described later, since the shaft mounting portion 33b is attached to the through hole 33a8, the flow path for communicating the first opening 33a1 and the second opening 33a2 in the inner wall 33a4 is only the communication hole 33a7. is there.

The shaft mounting portion 33b is formed by press-molding a metal plate such as stainless steel. The shaft mounting portion 33b is a portion of the valve body 33 that is mounted on the valve shaft 32c. The shaft mounting portion 33b includes a mounting portion 33b1, a medium diameter portion 33b2, a large diameter portion 33b3, and a flange portion 33b4 in this order from the bottom to the top.

The attachment portion 33b1 has a bag shape that accommodates the connecting portion 32c6 of the valve shaft 32c inside when the valve body 33 is attached to the valve shaft 32c. As shown in FIG. 2, the mounting portion 33b1 includes a fixing wall 33b1a, a fitting portion 33b1b, and a caulking portion 33b1c.

The fixed wall 33b1a is formed so that the inner side surface faces the pair of flat surfaces 32c7 of the connecting portion 32c6 when the connecting portion 32c6 of the valve shaft 32c is accommodated. The fitting portion 33b1b is formed so as to project outward in the radial direction from the fixed wall 33b1a. The fitting portion 33b1b is formed so as to be able to accommodate the steel ball 32d when the connecting portion 32c6 of the valve shaft 32c is accommodated. Further, the mounting portion 33b1 is formed with a pair of facing connecting surface portions (not shown) so as to connect the fixed walls 33b1a to each other.

When the valve body 33 is attached to the valve shaft 32c, the steel balls 32d protruding from the flat surface 32c7 are connected so as to be accommodated in the fitting portion 33b1b with the steel balls 32d arranged in the ball holes 32c8. The portion 32c6 is inserted into the mounting portion 33b1. Further, both fixed walls 33b1a are crimped to the steel ball 32d to form a crimped portion 33b1c. As a result, the mounting portion 33b1 is fixed to the steel ball 32d.

As shown in FIG. 3, the medium diameter portion 33b2 is formed in a cylindrical shape having a larger radial length than the mounting portion 33b1. The medium diameter portion 33b2 is formed so that the second groove portion 32c5 is located inside.

The large diameter portion 33b3 is formed in a cylindrical shape having a larger radial length than the medium diameter portion 33b2. The large diameter portion 33b3 is press-fitted into the through hole 33a8 of the main body portion 33a. As a result, the shaft mounting portion 33b is fixed to the main body portion 33a.

The flange portion 33b4 is formed so as to project from the upper end portion of the large diameter portion 33b3 toward the outer side in the radial direction over the entire circumference. The shaft mounting portion 33b is arranged on the main body portion 33a so that the lower side surface of the flange portion 33b4 contacts the upper side surface of the bottom wall of the cylinder wall portion 33a5.

Further, in a state where the shaft mounting portion 33b is mounted on the valve body 33, the inner peripheral surface of the medium diameter portion 33b2 and the outer peripheral surface of the cylindrical portion 32c3 of the valve shaft 32c are located in the radial direction of the valve shaft 32c. A gap ε is formed. The gap ε is formed over the entire circumference between the inner peripheral surface of the medium diameter portion 33b2 and the outer peripheral surface of the cylindrical portion 32c3. The valve body 33 is slantably attached to the valve shaft 32c by the gap ε.

The first seal portion 33c is provided in an annular shape and is arranged so as to cover the outer peripheral edge portion of the flange portion 33a3. The first seal portion 33c is made of a heat-resistant synthetic rubber material such as SBR (styrene-butadiene rubber) or EPDM (ethylene-propylene-diene copolymer).

A seal lip 33c1 (corresponding to the first contact portion of the present invention) that projects downward is provided on the peripheral edge portion of the first seal portion 33c. When the valve body 33 is located at the first position P1, the tip of the seal lip 33c1 comes into contact with the first valve seat 31g. In this case, the valve body 33 and the first valve seat 31g come into contact with each other, and the introduction of air from the introduction port 31d into the first fluid chamber 31c1 is restricted (details will be described later).

The seal lip 33c1 is formed in a lip shape in cross section. The seal lip 33c1 is formed inward in the radial direction. As a result, even when the inside of the fuel cell 6 becomes negative pressure, the seal lip 33c1 can be self-sealed by this negative pressure. The negative pressure in the fuel cell 6 is generated, for example, by the reaction of hydrogen gas remaining in the fuel cell 6 with oxygen when power generation is stopped, or the condensation of residual water vapor due to the temperature drop of the fuel cell 6. As described above, on the side of the first opening 33a1 of the main body 33a, a seal lip 33c1 that can come into contact with the first valve seat 31g is provided.

The second seal portion 33d (corresponding to the second contact portion of the present invention) is provided in an annular shape and a flat plate shape, and is arranged on the bottom wall of the cylinder wall portion 33a5. Specifically, the second seal portion 33d is arranged on the upper side surface of the flange portion 33b4 of the shaft mounting portion 33b. The second seal portion 33d is fixed to the flange portion 33b4 by being adhered with an adhesive. The second seal portion 33d is made of a heat-resistant synthetic rubber material such as SBR (styrene-butadiene rubber) or EPDM (ethylene-propylene-diene copolymer).

When the valve body 33 is located at the second position P2 (see FIG. 5), the upper side surface of the second seal portion 33d comes into contact with the second valve seat 31h. In this case, the valve body 33 and the second valve seat 31h come into contact with each other, and the derivation of air from the connecting path 33f (described later) and the second fluid chamber 31c2 to the second outlet 31f is restricted (details will be described later). To do). As described above, the bottom wall of the cylinder wall portion 33a5 is provided with the second seal portion 33d that can come into contact with the second valve seat 31h.

The diaphragm holding portion 33e holds the diaphragm 35 in the valve body 33 (details will be described later). The diaphragm holding portion 33e is formed by press-molding a metal plate such as stainless steel. The diaphragm holding portion 33e includes a large diameter portion 33e1, a step portion 33e2, a small diameter portion 33e3, and a flange portion 33e4 from the upper side to the lower side.

The large diameter portion 33e1 and the small diameter portion 33e3 are formed in a tubular shape that opens the upper end and the lower end, respectively. The step portion 33e2 is formed in a stepped shape connecting the large diameter portion 33e1 and the small diameter portion 33e3. By press-fitting the small diameter portion 33e3 into the second opening 33a2, the diaphragm holding portion 33e is fixed to the main body portion 33a.

The collar portion 33e4 is formed in a collar shape that protrudes inward in the radial direction from the lower end portion of the small diameter portion 33e3 over the entire circumference. The diaphragm holding portion 33e is arranged on the main body portion 33a so that the lower side surface of the flange portion 33e4 contacts the upper side surface of the connecting wall portion 33a6.

Further, the valve body 33 is further provided with a connecting path 33f. The connection path 33f is an air flow path that connects the first opening 33a1 and the second opening 33a2 via the communication hole 33a7. The connection path 33f connects the introduction port 31d and the second fluid chamber 31c2 when the valve body 33 is located at the first position P1, and when the valve body 33 is located at the second position P2 (see FIG. 5). , The first fluid chamber 31c1 and the second fluid chamber 31c2 are connected. Further, the connecting path 33f connects the first fluid chamber 31c1 and the second fluid chamber 31c2 when the valve body 33 is located between the first position P1 and the second position P2 (see FIG. 4).

Further, when the valve body 33 is located at the first position P1, the connection between the introduction port 31d and the first fluid chamber 31c1 is cut off (see FIG. 2). When the valve body 33 is located at the second position P2, the connection between the connection path 33f and the second fluid chamber 31c2 and the second outlet 31f is cut off (see FIG. 5). Therefore, when the valve body 33 is located at the first position P1, the introduction port 31d and the second outlet port 31f are connected (see FIG. 2). When the valve body 33 is located between the first position P1 and the second position P2, the introduction port 31d is connected to the first outlet 31e and the second outlet 31f (see FIG. 4). When the valve body 33 is located at the second position P2, the introduction port 31d and the first outlet port 31e are connected.

The spring 34 urges the valve body 33 downward. The spring 34 is a coil spring. The spring 34 is arranged radially outside the tubular portion 31b2 between the upper side wall of the second housing 31b and the flange portion 33e4.

The diaphragm 35 is provided in a film shape that bends in response to the movement of the valve body 33. The diaphragm 35 is integrally formed of a synthetic rubber material. The diaphragm 35 is formed with a through hole 35a penetrating in the first direction at the center thereof.

The inner peripheral edge portion of the through hole 35a is sandwiched between the upper side surface of the main body portion 33a and the lower side surface of the step portion 33e2 of the diaphragm holding portion 33e. As a result, the diaphragm 35 is held in the valve body 33 in an airtight and liquidtight manner. Further, the diaphragm 35 is arranged so that the valve body 33 penetrates in the first direction.

The outer peripheral edge of the diaphragm 35 is sandwiched between the upper side surface of the first housing 31a and the lower side surface of the second housing 31b. As a result, the diaphragm 35 is held in the housing 31 in an airtight and liquidtight manner. By arranging the diaphragm 35 in this way, the valve chamber 31c is divided into the first fluid chamber 31c1 and the second fluid chamber 31c2 by the diaphragm 35.

In this way, the diaphragm 35 is arranged so that the valve body 33 penetrates along the first direction, is provided in a film shape that bends according to the movement of the valve body 33, and the valve chamber 31c is provided in the first fluid chamber. It is arranged so as to partition into 31c1 and a second fluid chamber 31c2.

Further, as shown in FIG. 2, the valve body 33 has a first pressure receiving portion 33 g. The first pressure receiving portion 33g is a portion on which the air pressure of the introduction port 31d acts when the valve body 33 is located at the first position P1. The effective pressure receiving area of the first pressure receiving portion 33g is the area when the radial inner range at the portion where the seal lip 33c1 and the first valve seat 31g come into contact is projected onto a plane orthogonal to the first direction. The effective pressure receiving area of the first pressure receiving portion 33g is the area of a circle having a diameter A in the first embodiment.

Further, the diaphragm 35 has a second pressure receiving portion 35b. The second pressure receiving portion 35b is a portion on which the air pressure of the second fluid chamber 31c2 acts. The effective pressure receiving area of the second pressure receiving portion 35b is the area when the area inside the radial direction connecting the lowest points of the bent portions of the diaphragm 35 is projected onto a plane orthogonal to the first direction. The effective pressure receiving area of the second pressure receiving portion 35b is the area of a circle having a diameter B in the first embodiment. Further, in the first embodiment, the effective pressure receiving area of the first pressure receiving portion 33g and the effective pressure receiving area of the second pressure receiving portion 35b are set to be the same area.

Next, the operation of the three-way valve 3 will be described. When the fuel cell 6 is not generated, air is not supplied to the fuel cell 6. That is, in this case, in the three-way valve 3, as shown in FIG. 2, the first valve seat 31 g and the valve body 33 are in contact with each other because the valve body 33 is located at the first position P1. Controlled by the state. As a result, the introduction of air from the introduction port 31d to the first fluid chamber 31c1 and thus the derivation of air to the first outlet 31e are restricted.

When the three-way valve 3 is in the first closed state, the valve body 33 is located at the first position P1 and the motor 32b is de-energized. In this case, the valve body 33 is urged downward by the spring 34, and the rotation of the valve shaft 32c is regulated by the detent torque of the motor 32b. As a result, the position of the valve body 33 is held at the first position P1.

Further, in this case, a force generated by the difference pressure between the air pressure of the introduction port 31d and the air pressure of the first fluid chamber 31c1 (hereinafter referred to as the first acting force) acts on the valve body 33. There is. Further, in this case, a force generated by the difference pressure between the air pressure of the second fluid chamber 31c2 and the air pressure of the first fluid chamber 31c1 (hereinafter referred to as the second acting force) acts on the valve body 33. are doing. Since the introduction port 31d and the second fluid chamber 31c2 are connected by the connection path 33f, the air pressure of the introduction port 31d and the air pressure of the second fluid chamber 31c2 are substantially the same. Therefore, the first acting force and the second acting force act on the valve body 33 in opposite directions. Therefore, the magnitude of the first acting force is suppressed by the magnitude of the second acting force.

Further, as described above, since the effective pressure receiving area of the first pressure receiving portion 33g and the effective pressure receiving area of the second pressure receiving portion 35b are set to be the same, the magnitude of the first acting force and the second acting The magnitude of the force is about the same. That is, the force acting on the valve body 33 (the resultant force of the first acting force and the second acting force) due to the pressure of air in each part of the introduction port 31d, the first fluid chamber 31c1 and the second fluid chamber 31c2 becomes about zero. It has become.

Therefore, when the valve body 33 is located at the first position P1, the first valve seat 31 g and the valve body 33 are separated from the first valve closed state in which the first valve seat 31 g and the valve body 33 are in contact with each other. The first valve opening force, which is the force for opening the valve, is only the resultant force of the urging force of the spring 34 and the force acting on the valve body 33 due to the sliding resistance between the valve shaft 32c and the shaft retainer portion 31i. Become.

When the valve body 33 is located at the first position P1, the introduction port 31d and the second outlet port 31f are connected via the connection path 33f. Therefore, when the air compressor 23 is driven, the air introduced from the oxygen system supply pipe 21a into the introduction port 31d is sent to the second outlet 31f via the connection path 33f as shown by an arrow in FIG. Is led out to the bypass pipe 21c.

When power is generated in the fuel cell 6, air is supplied to the fuel cell 6 by changing the first valve seat 31 g and the valve body 33 from the first closed state to the opened state. Specifically, the drive device 32 is rotated in one direction by a control command from the control device 9, so that the valve shaft 32c and thus the valve body 33 move upward from the first position P1 along the first direction. ..

When the position of the valve body 33 is located between the first position P1 and the second position P2, the air introduced from the introduction port 31d into the first fluid chamber 31c1 is as shown by the arrow in FIG. It is led out from the first fluid chamber 31c1 to the first outlet 31e, and is led out from the second outlet 31f via the connecting path 33f.

Further, when the valve body 33 is located at the second position P2 and the second valve seat 31h and the valve body 33 are in contact with each other in the second valve closed state, as shown by the arrow in FIG. 5, the connecting path Since the derivation of air from the 33f and the second fluid chamber 31c2 to the second outlet 31f is restricted, the air introduced from the introduction port 31d into the first fluid chamber 31c1 is from the first fluid chamber 31c1 to the first outlet. Derived to 31e.

In this case, the second valve opening force, which is the force for separating the second valve seat 31h and the valve body 33 from the second valve closed state to open the valve, is the downward urging force by the spring 34 and the valve shaft 32c. The force acting on the valve body 33 due to the sliding resistance between the shaft retainer portion 31i and the like, and the force acting on the valve body 33 due to the differential pressure between the air pressure of the second outlet 31f and the first fluid chamber 31c1. It becomes the resultant force of.

When the second valve seat 31h and the valve body 33 are changed from the second closed state to the valve open state, the drive device 32 is driven in the other direction by the control command from the control device 9, so that the valve shaft 32c As a result, the valve body 33 moves downward from the second position P2 along the first direction.

When there is a variation in the accuracy of parallelism between the first seal portion 33c and the first valve seat 31g, or between the second seal portion 33d and the second valve seat 31h, the valve body 33 becomes the first. When located at the one position P1 or the second position P2, the valve body 33 is inclined by the gap ε with respect to the valve shaft 32c. As a result, the sealing property between the first seal portion 33c and the first valve seat 31g or between the second seal portion 33d and the second valve seat 31h is ensured.

According to the first embodiment, the three-way valve 3 (fluid control valve) is arranged in a housing 31 in which a valve chamber 31c for passing air is provided inside and a valve chamber 31c, and is arranged in a first position P1 and a first. A valve body 33 provided so as to be movable along a first direction between a position P1 and a second position P2 different from the position P1, a driving device 32 for driving the valve body 33 to move, and a valve body 33 are first. It is arranged so as to penetrate along the direction, is provided in a film shape that bends according to the movement of the valve body 33, and is arranged so as to partition the valve chamber 31c into the first fluid chamber 31c1 and the second fluid chamber 31c2. The diaphragm 35, the introduction port 31d for introducing air into the first fluid chamber 31c1, the first outlet 31e for drawing out air from the first fluid chamber 31c1, and the valve body 33 provided in the first fluid chamber 31c1. Is located at the first position P1, the first valve seat 31g that regulates the introduction of air from the introduction port 31d to the first fluid chamber 31c1 by contacting the valve body 33, and the valve body 33 are provided. The introduction port 31d and the second fluid chamber 31c2 are connected when the valve body 33 is located at the first position P1, and the first fluid chamber 31c1 and the second fluid chamber are connected when the valve body 33 is located at the second position P2. When the valve body 33 is provided in the connecting path 33f connecting the 31c2, the second outlet 31f for drawing out air from the second fluid chamber 31c2, and the second fluid chamber 31c2, and the valve body 33 is located in the second position P2, the valve It includes a connecting path 33f and a second valve seat 31h that regulates the derivation of air from the second fluid chamber 31c2 to the second outlet 31f by coming into contact with the body 33.

According to this, when the valve body 33 is located at the first position P1 and the first valve seat 31 g and the valve body 33 are in contact with each other in the first valve closed state, the connection provided in the valve body 33 is provided. The air supplied from the introduction port 31d is led out to the second fluid chamber 31c2 via the passage 33f. Therefore, the force acting on the valve body 33 (first acting force) due to the differential pressure between the air pressure of the introduction port 31d and the air pressure of the first fluid chamber 31c1 becomes the air pressure of the second fluid chamber 31c2. It is suppressed by the force acting on the diaphragm 35 and thus on the valve body 33 (second acting force) due to the pressure difference from the air pressure of the first fluid chamber 31c1. Therefore, in this case, it is possible to suppress the first valve opening force, which is the force that separates the first valve seat 31g, which is in the first valve closing state, from the valve body 33 to open the valve.

Further, the three-way valve 3 leads out the air supplied from the introduction port 31d through the connection path 33f and the second fluid chamber 31c2 in addition to the first outlet 31e which is led out through the first fluid chamber 31c1. It has a second outlet 31f. Therefore, the three-way valve 3 can suppress the first valve opening force that changes the first valve seat 31g and the valve body 33 from the first closed state to the valve opening state, and at the same time, the air supplied from the introduction port 31d can be suppressed. , The flow can be divided into the first outlet 31e and the second outlet 31f.

Further, the valve body 33 is provided in a tubular shape with the first direction as the axial direction, and has a first opening 33a1 that opens to the first fluid chamber 31c1 side at the first end and a second opening 33a1 at the second end. A main body 33a provided with a second opening 33a2 that opens on the fluid chamber 31c2 side, and a tubular shape that is provided inside the main body 33a and opens toward the second opening 33a2 side. An inner wall portion 33a4 provided with a bottom tubular wall portion 33a5, a connecting wall portion 33a6 for connecting a part of the peripheral side wall of the tubular wall portion 33a5 and a part of the peripheral side wall of the main body portion 33a over the entire circumference. , Is equipped. The first opening 33a1 of the main body 33a is provided with a seal lip 33c1 that can come into contact with the first valve seat 31g. A second seal portion 33d that can come into contact with the second valve seat 31h is provided on the bottom wall of the cylinder wall portion 33a5. A communication hole 33a7 for communicating the first opening 33a1 and the second opening 33a2 is provided on the peripheral side wall of the cylinder wall portion 33a5. The connection path 33f is an air flow path that connects the first opening 33a1 and the second opening 33a2 via the communication hole 33a7.

For example, when the communication hole 33a7 opens in the direction along the first direction and the flow path cross-sectional area of the communication hole 33a7 is relatively large, the radial size of the valve body 33 is relatively large. Become. In this case, the diaphragm 35 and thus the three-way valve 3 are increased in size. On the other hand, since the communication hole 33a7 of the present invention is provided on the peripheral side wall of the tubular wall portion 33a5, the direction intersects the first direction (in the first embodiment, the direction orthogonal to the first direction). Open to. Therefore, in this case, when the cross-sectional area of the flow path is relatively large, the size of the valve body 33 in the axial direction is relatively large.

Therefore, when the communication hole 33a7 opens in the direction intersecting the first direction as in the present invention, the communication hole 33a7 opens in the direction along the first direction even when the flow path cross-sectional area becomes relatively large. The size of the valve body 33 in the radial direction, and thus the overall size of the valve body 33, can be suppressed as compared with the case where the valve body 33 is used. Therefore, it is possible to suppress the increase in size of the diaphragm 35 and thus the three-way valve 3.

Further, the valve body 33 has a first pressure receiving portion 33g on which the air pressure of the introduction port 31d acts when the valve body 33 is located at the first position P1. The diaphragm 35 has a second pressure receiving portion 35b on which the pressure of air in the second fluid chamber 31c2 acts. The effective pressure receiving area of the first pressure receiving portion 33g and the effective pressure receiving area of the second pressure receiving portion 35b are set to be the same area.

According to this, the effective pressure receiving area of the first pressure receiving portion 33g and the effective pressure receiving area of the second pressure receiving portion 35b are set to be the same area. Therefore, the force acting on the valve body 33 (first acting force) due to the differential pressure between the air pressure of the introduction port 31d and the air pressure of the first fluid chamber 31c1 becomes the air pressure of the second fluid chamber 31c2. It becomes approximately zero due to the force acting on the diaphragm 35 and thus the valve body 33 (second acting force) due to the pressure difference from the air pressure in the first fluid chamber 31c1. Therefore, the first valve opening force that opens the valve body 33 and the first valve seat 31 g that is in the first valve closed state can be reliably suppressed.

<Second embodiment>
Next, the fluid control valve (three-way valve 3) according to the second embodiment of the present invention will be described mainly with reference to FIG. 6 in a portion different from the fluid control valve according to the first embodiment described above.
The main body 33a of the valve body 33 in the first embodiment described above is provided with the cylinder wall portion 33a5, but the main body 133a of the valve body 133 in the second embodiment does not include the cylinder wall portion. Further, the shaft mounting portion 33b of the first embodiment described above is provided separately from the diaphragm holding portion 33e, but instead of this, the shaft mounting portion 133b of the second embodiment is provided with the diaphragm holding portion 133e. It is provided integrally with.

Specifically, the shaft mounting portion 133b of the second embodiment has a tubular connecting wall 133b5 that is connected to the diaphragm holding portion 133e. Further, the connecting wall 133b5 is provided with a plurality of communication holes 133a7 that communicate the first opening 133a1 and the second opening 133a2. The communication holes 133a7 are provided so as to penetrate in a direction orthogonal to the first direction.

<Third Embodiment>
Next, the fluid control valve (three-way valve 3) according to the third embodiment of the present invention will be mainly described with reference to FIG. 7 with respect to a portion different from the fluid control valve according to the first embodiment described above.
The main body 33a of the valve body 33 in the first embodiment described above is provided with the cylinder wall portion 33a5, but the main body portion 233a of the valve body 233 in the third embodiment does not include the cylinder wall portion. Further, the valve body 233 of the third embodiment includes a shaft mounting portion 233b instead of the shaft mounting portion 33b of the first embodiment described above.

The shaft mounting portion 233b of the third embodiment has a bent portion 233b6 provided so that the peripheral edge portion of the flange portion 233b4 is bent downward. The shaft mounting portion 233b is fixed to the main body portion 233a by press-fitting the bent portion 233b6 into the first opening portion 233a1. Further, the flange portion 233b4 is provided with a plurality of communication holes 233b7. The communication hole 233b7 is provided so as to penetrate along the first direction.

<Fourth Embodiment>
Next, the fluid control valve (three-way valve 3) according to the fourth embodiment of the present invention will be described mainly with reference to FIG. 8 with respect to a portion different from the fluid control valve according to the first embodiment described above.
The main body 33a of the valve body 33 in the first embodiment described above is provided with the cylinder wall portion 33a5, but the main body portion 333a of the valve body 333 in the fourth embodiment does not include the cylinder wall portion. Further, the first opening portion 333a1 of the main body portion 333a in the fourth embodiment is provided on the inner peripheral surface of the connecting wall portion 333a6.

Further, the diaphragm holding portion 333e of the fourth embodiment has a large diameter portion 333e5 and a small diameter portion 333e6. The diaphragm holding portion 333e is made of a synthetic resin material. The small diameter portion 333e6 is press-fitted into the second opening 333a2 of the main body portion 333a. Further, the connecting path 333f of the fourth embodiment is provided in the diaphragm holding portion 333e. Specifically, the connecting path 333f is provided so that the first end opens on the lower side surface of the small diameter portion 333e6 and the second end opens on the peripheral side surface of the large diameter portion 333e5.

Further, the lower end portion of the valve shaft 332c is fixed to the upper side wall of the diaphragm holding portion 333e so as to be rotatable integrally with the valve body 333. The valve shaft 332c of the fourth embodiment does not have the connecting portion 32c6 of the first embodiment described above. Further, a second seal portion 333d is arranged on the upper side surface of the diaphragm holding portion 333e so as to be in contact with the second valve seat 31h.

<Fifth Embodiment>
Next, the fluid control valve (three-way valve 3) according to the fifth embodiment of the present invention will be described mainly with reference to FIG. 9 with respect to a portion different from the fluid control valve according to the fourth embodiment described above.
The first valve seat 31g of the fourth embodiment described above is provided in a flat annular shape on the peripheral surface of the opening of the introduction port 31d on the lower side surface of the first fluid chamber 31c1. On the other hand, the first valve seat 431g of the fifth embodiment is provided at the corner of the peripheral edge of the opening of the introduction port 431d in the first fluid chamber 431c1.

Further, the main body portion 433a in the fifth embodiment does not include the flange portion 333a3 in the fourth embodiment. The small diameter portion 433e6 of the fifth embodiment is provided so as to project downward from the main body portion 433a. Further, the first seal portion 433c of the fifth embodiment is attached to the outer peripheral surface of the lower end portion of the small diameter portion 433e6. The first seal portion 433c is provided with a first contact portion 433c1 with the first valve seat 431 g having an arcuate cross section.

Further, the effective pressure receiving area of the first pressure receiving portion 433 g of the fifth embodiment is the area of a circle whose diameter is C smaller than A. As described above, in the fifth embodiment, the effective pressure receiving area of the first pressure receiving unit 433g is set to be smaller than the effective pressure receiving area of the second pressure receiving unit 435b.

<Modification example>
Although an example of the fluid control valve is shown in the above-described embodiment, the present invention is not limited to this, and other configurations may be adopted. For example, although the fluid control valve of the present invention is used in a fuel cell system, it can be widely used as a fluid control valve for vehicles such as a fuel supply system or a hydraulic brake system. Further, the fluid control valve of the present invention can also be used as a fluid control valve for household equipment or general industrial machinery.

Further, in the first to fourth embodiments described above, the effective pressure receiving area of the first pressure receiving portion 33g and the effective pressure receiving area of the second pressure receiving portion 35b are set to be the same, but instead of this. Therefore, the effective pressure receiving area of the first pressure receiving portion 33g and the effective pressure receiving area of the second pressure receiving portion 35b may be set to be different. For example, when the effective pressure receiving area of the second pressure receiving portion 35b is set larger than the effective pressure receiving area of the first pressure receiving portion 33g, the first valve opening force can be increased.

Further, in the first to third embodiments described above, the shaft mounting portions 33b, 133b, 233b and the diaphragm holding portions 33e, 133e, 233e are formed of a metal material, but instead of this, a synthetic resin is used. It may be formed by a material. Further, in this case, the shaft mounting portions 33b, 133b, 233b and the diaphragm holding portions 33e, 133e, 233e may be bonded to the main body portions 33a, 133a, 233a by welding.

Further, the shape of the housing 31, the shape and material of each member constituting the valve body 33, 133, 233, 333, 433, and the shape of the diaphragms 35, 435 are changed so as not to deviate from the gist of the present invention. Is also good.

1 ... Fuel cell system, 3 ... Three-way valve, 31 ... Housing, 31c ... Valve chamber, 31c1 ... First fluid chamber, 31c2 ... Second fluid chamber, 31d ... Introduction port, 31e ... First outlet, 31f ... Second Outlet port, 31 g ... 1st valve seat, 31h ... 2nd valve seat, 32 ... Drive device, 33 ... Valve body, 33a ... Main body, 33a1 ... 1st opening, 33a2 ... 2nd opening, 33a3 ... Flange , 33a4 ... Inner wall part, 33a5 ... Cylinder wall part, 33a6 ... Connection wall part, 33a7 ... Communication hole, 33c ... First seal part, 33c1 ... Seal lip (first contact part), 33d ... Second seal part (second) Contact part), 33f ... Connection path, 33g ... First pressure receiving part, 34 ... Spring, 35 ... Diaphragm, 35b ... Second pressure receiving part, P1 ... First position, P2 ... Second position.

Claims (3)

A housing with a valve chamber inside that allows fluid to flow,
A valve body arranged in the valve chamber and provided so as to be movable along the first direction between the first position and the second position different from the first position.
A drive device that drives the valve body to move, and
The valve body is arranged so as to penetrate along the first direction, is provided in a film shape that bends according to the movement of the valve body, and the valve chamber is divided into a first fluid chamber and a second fluid chamber. Diaphragms arranged to partition and
An inlet for introducing the fluid into the first fluid chamber and
A first outlet for deriving the fluid from the first fluid chamber,
When the valve body is provided in the first fluid chamber and the valve body is located at the first position, the introduction of the fluid from the introduction port into the first fluid chamber is regulated by coming into contact with the valve body. One valve seat and
The first is provided on the valve body and connects the introduction port and the second fluid chamber when the valve body is located at the first position, and when the valve body is located at the second position. A connecting path connecting the fluid chamber and the second fluid chamber,
A second outlet for deriving the fluid from the second fluid chamber,
When the valve body is provided in the second fluid chamber and the valve body is located at the second position, the fluid from the connection path and the second fluid chamber to the second outlet by contacting with the valve body. A fluid control valve equipped with a second valve seat that regulates the derivation of. The valve body
It is provided in a tubular shape with the first direction as the axial direction, and has a first opening that opens to the first fluid chamber side at the first end and an opening to the second fluid chamber side at the second end. A main body provided with a second opening and
A bottomed tubular wall portion provided inside the main body portion and opened toward the second opening side, a part of the peripheral side wall of the tubular wall portion, and the main body portion. It is provided with an inner wall portion provided with a connecting wall portion that connects a part of the peripheral side wall over the entire circumference.
A first contact portion capable of contacting the first valve seat is provided at the first opening of the main body portion.
A second contact portion capable of contacting the second valve seat is provided on the bottom wall of the cylinder wall portion.
A communication hole for communicating the first opening and the second opening is provided on the peripheral side wall of the cylinder wall portion.
The fluid control valve according to claim 1, wherein the connecting path is a flow path of the fluid connecting the first opening and the second opening through the communication hole. When the valve body is located at the first position, the valve body has a first pressure receiving portion on which the pressure of the fluid at the introduction port acts.
The diaphragm has a second pressure receiving portion on which the pressure of the fluid in the second fluid chamber acts.
The fluid control valve according to claim 1 or 2, wherein the effective pressure receiving area of the first pressure receiving portion and the effective pressure receiving area of the second pressure receiving portion are set to be the same area.

Images