JP4398349B2 - Electromagnetic shut-off valve for fuel cell - Google Patents

Description

  The present invention relates to, for example, a fuel cell electromagnetic shut-off valve for switching a communication state of a reaction gas (hydrogen) flowing through a communication chamber under an excitation action of a solenoid portion in a fuel cell system.

  The present applicant has proposed a regulator unit for a fuel cell that includes a shut-off valve that is connected to a fluid passage and switches a communication state of a fluid such as fuel gas flowing through the fluid passage under the excitation action of a solenoid (Patent Document). 1).

  In this shut-off valve, a fixed iron core is fixed to a housing, and a plunger is provided coaxially with the fixed iron core and displaced toward the fixed iron core under the exciting action of a solenoid portion. A valve body is connected to one end of the plunger, and the valve body is closed by the seating of the valve body on the valve seat of the body by the elastic force of the spring member. The valve body includes a first valve that can be seated on a first valve seat of the body, and a second valve that is displaceably held at a lower end portion of the plunger, and the second valve is a substantially C-shaped clip. The valve body is held at the lower end portion of the plunger by being crimped to the plunger via.

  First, when the second valve is separated from the second valve seat provided inside the plunger, fluid is led out to the port through the inside of the second valve, and the second valve is arranged. When the pressure in the valve chamber decreases, the first valve is separated from the first valve seat, and a larger amount of fluid is led out to the port through the valve seat.

JP 2004-185831 A

  The present invention has been made in connection with the above proposal, and an object thereof is to provide a fuel cell electromagnetic valve capable of improving the responsiveness when the valve body is displaced.

In order to achieve the above object, the present invention provides a fuel cell electromagnetic shut-off valve for shutting off supply of a reaction gas in a fuel cell.
An introduction port through which the reaction gas is introduced, a discharge port through which the reaction gas introduced from the introduction port is discharged, and a valve body having a communication chamber communicating with the introduction and discharge ports;
A solenoid portion provided inside the housing connected to the valve body, and having an exciting action by an electric current;
A movable member provided so as to face a fixed member provided inside the solenoid part, and displaced along an axial direction under the excitation action of the solenoid part;
A flexible member that is provided inside the communication chamber, is attached to the valve body, bends as the valve body is displaced, and divides the communication chamber;
A first valve portion that can be seated / separated with respect to a first valve seat portion mounted on the movable member, and a second valve portion that can be seated / separated with respect to a second valve seat portion formed on the valve body. a valve body having a door,
A communication passage formed in the valve body and communicating with one communication chamber and the other communication chamber divided by the flexible member;
With
The first valve portion is disposed on the movable member side with respect to the flexible member, and the second valve portion is disposed on the valve body side adjacent to the flexible member , Is formed on the second valve seat portion side from the second valve portion, and is formed with a guide portion that is guided to be displaceable along the axial direction with respect to the valve body. Between the second valve portion and the valve body, and the second valve portion is disposed on the radially outer side of the guide portion with respect to the second valve seat portion between the second valve portion and the valve body. together with the first elastic member for urging in a direction to separate is provided, a pilot passage communicating to said outlet port from said first valve portion and said Rukoto formed inside the guide portion.

According to the present invention, the first valve portion of the valve body is disposed closer to the movable member than the flexible member, the second valve portion is disposed adjacent to the valve body side of the flexible member, and A guide portion that is formed on the second valve seat portion side with respect to the second valve portion and is guided to be displaceable with respect to the valve body is provided. In addition, the guide portion is provided in a passage communicating with the outlet port, and the second valve is disposed between the second valve portion of the valve body and the valve body at a position on the radially outer side of the guide portion in the passage. Provided with a first elastic member that urges the portion in a direction away from the second valve seat portion, and a pilot passage communicating from the first valve portion of the valve body to the outlet port is formed in the guide portion To do. And the pressure of the reactive gas introduced into one communicating chamber via the flexible member which was adjacent to the 2nd valve part and was attached to the valve body, and the pressure of the reactive gas introduced into the other communicating chamber Rutotomoni displaces the valve body with a pressure difference between the guide portion is Ru is guided axially by the valve body.

Therefore, it is possible to reliably and quickly displace the valve body by the pressure difference without being affected by the upstream and downstream pressures in the fluid passage to which the fuel cell solenoid valve is connected. As compared with the valve body, the responsiveness when the valve body is seated on and removed from the first and second valve seat portions can be improved , and the valve body is guided along the axial direction with respect to the valve body by the guide portion. Since it is guided, the valve body is prevented from being tilted (tilted) or displaced in the radial direction, and the seating property when the first and second valve portions of the valve body are seated on the first and second valve seat portions is improved. It can be made even better.

Also, a first elastic member that urges the second valve portion between the second valve portion and the valve body in the direction of separating the second valve portion from the second valve seat portion, radially outward of the guide portion in the passage. Therefore, the communication chamber can be reduced in size compared with the configuration in which the elastic member is provided inside the communication chamber, and the elastic force of the first elastic member causes the valve body to move toward the movable member. Since it is biased in the pressing direction, the valve body can follow the displacement of the movable member. Along with this, it is Rukoto improves the responsiveness when the valve body is displaced in the axial direction.

Further , by forming the first elastic member in a tapered shape , the radius is such that the second valve portion is always at the center (axial center) of the second valve seat portion under the elastic action of the first elastic member. Rukoto to prevent it is possible to adjust the direction, and a guide portion of the first elastic member and the valve body can be radially spaced, contact at the time of the guide portion is displaced in the axial direction Can do.

  Furthermore, by providing the valve body with a cylindrical guide member that holds the guide portion so as to be displaceable along the axial direction, the guide portion can be reliably displaced along the axial direction by the guide member. Therefore, the seating property with respect to the first and second valve seat portions of the valve body can be further improved.

  Further, by forming the guide member from fluororesin and fitting it into the valve body, it is possible to improve the slidability when the guide portion of the valve body is displaced along the guide member.

  Further, the guide member locks an end surface facing the second valve portion in an axial direction by a locking member provided on the valve body, and the locking member has the first valve between the first valve portion and the second valve portion. It is good to interpose an elastic member. As a result, the guide member made of fluororesin is locked in the axial direction by the locking member, so that the guide member can be prevented from being pulled out from the valve body, and the locking member can The end of one elastic member can be held. Moreover, the said locking member can be suitably hold | maintained with respect to a valve body with the elastic force of a said 1st elastic member.

  Furthermore, the guide member is made of a resin material, and a flange portion having a radially increased diameter is formed at an end facing the second valve portion, so that the guide member is lightly press-fitted into the valve body. Alternatively, by inserting and holding the spring member with the flange, the guide member is held with respect to the valve body by the elastic force of the spring member via the flange. Therefore, since the conventional locking member for holding the guide member is not necessary, the number of parts can be reduced and the cost can be reduced, and accordingly, the assembly workability can be improved. .

  Furthermore, by providing the communication passage with a throttle portion that restricts the flow rate of the reaction gas flowing through the communication passage, the reaction gas flowing from one communication chamber divided by the flexible member to the other communication chamber can be obtained. A flow rate can be suppressed and a pressure difference can be easily generated between the communication chambers. Therefore, it is possible to improve the responsiveness when the valve body is seated on and removed from the first and second valve seats due to the pressure difference between the communication chambers.

  Further, by providing the throttle portion at a position separated from the introduction port in the valve body, the flow rate of the reaction gas does not become unstable due to the flow velocity of the reaction gas introduced from the introduction port, and the communication portion is connected. The reaction gas can be stably supplied at a desired flow rate into the communication chamber through the passage and the throttle, and the pressure of the reaction gas in the communication chamber can be stabilized.

  Furthermore, it is preferable that a mesh-shaped removal member for removing dust contained in the reaction gas is provided inside the introduction port, and the opening diameter of the mesh of the removal member is set smaller than the passage diameter of the throttle portion. Accordingly, dust or the like larger than the passage diameter of the throttle portion does not enter the inside of the valve body through the removing member, and thus the throttle portion is not clogged with the dust or the like. Therefore, the reaction gas introduced from the introduction port can be reliably and stably circulated into the communication chamber through the throttle portion.

Furthermore, the diameter of the pilot passage may be set larger than the diameter of the throttle portion. Accordingly, the flow rate flowing from one communication chamber to the other communication chamber through the throttle portion is led out from the other communication chamber to the lead-out port through the pilot passage formed in the first valve portion. The flow rate can be increased. Therefore, the pressure of the other communication chamber can be suitably reduced, and the pressure difference generated between the other communication chamber and the one communication chamber can be increased.

  Still further, the flexible member sandwiches the peripheral portion of the flexible member between the first body portion and the second body portion constituting the valve body, and the first body portion and the second body portion are sandwiched between the first body portion and the second body portion. A seal member may be provided in a radially outward direction from a portion where the peripheral edge is sandwiched therebetween. Thereby, in addition to the peripheral part of the flexible member, the sealing member reliably holds the communication chamber so that leakage of the reaction gas from between the first body part and the second body part is prevented. It can be reliably prevented.

  Further, by forming a communication path between the seal member and the portion where the peripheral edge of the flexible member is sandwiched in the valve body, the communication path is defined by the peripheral edge of the flexible member and the seal member. The flowing reaction gas is prevented from leaking.

  Further, the movable member may be provided with a third elastic member made of an elastic material between the fixed member. Thereby, even when the movable member and the fixed member come into contact with each other under the displacement action of the movable member, the impact at the time of the contact is buffered by the third elastic member, and the generation of the contact sound caused by the contact is reduced. can do.

  Furthermore, by forming the first valve seat portion on which the first valve portion is seated from an elastic material, the contact sound generated when the first valve portion is seated on the first valve seat portion is reduced. Can do.

  Furthermore, the second valve portion is provided with a fourth elastic member made of an elastic material on one end surface side that is seated on the second valve seat portion, so that the second valve portion is located with respect to the second valve seat portion. When seated, the second valve seat portion can be suitably closed, and contact noise during seating can be reduced.

  According to the present invention, the following effects can be obtained.

  That is, the pressure of the reaction gas introduced into one communication chamber via the flexible member that is adjacent to the second valve portion and is attached to the valve body, and the pressure of the reaction gas introduced into the other communication chamber Is not affected by upstream and downstream pressures in the fluid passage to which the fuel cell solenoid valve is connected. Therefore, the valve body can be displaced reliably and quickly, and the responsiveness when opening and closing the valve body can be improved as compared with the conventional shutoff valve.

  Further, by providing a guide portion in the valve body and guiding the valve body so as to be displaceable along the axial direction, the valve body can be prevented from being inclined or displaced in the radial direction. The seating property when seated on the first and second valve seats can be further improved.

  FIG. 1 is a configuration diagram of a fuel cell system 200 including a fuel cell electromagnetic shut-off valve 10 (hereinafter simply referred to as a shut-off valve 10) according to an embodiment of the present invention. The fuel cell system 200 is mounted on a vehicle such as an automobile, for example.

  As shown in FIG. 1, this fuel cell system 200 includes a plurality of cells compared to a cell formed by sandwiching a solid polymer electrolyte membrane made of a solid polymer ion exchange membrane or the like from both sides with an anode and a cathode. A fuel cell stack 202 provided in a stacked manner is included. The fuel cell stack 202 is provided with, for example, an anode supplied with hydrogen as a fuel and a cathode supplied with air containing oxygen as an oxidant. Note that the reaction gas used in this embodiment includes hydrogen, air, and surplus hydrogen.

  The cathode is provided with an air discharge port 210 to which an air supply port 206 for supplying air from the oxidant supply unit 204 and an air discharge unit 208 for discharging the air in the cathode to the outside are connected. On the other hand, the anode is provided with a hydrogen supply port 214 to which hydrogen is supplied from the fuel supply unit 212 and a hydrogen discharge port 218 to which the hydrogen discharge unit 216 is connected.

  In the fuel cell stack 202, hydrogen ions generated by a catalytic reaction at the anode pass through the solid polymer electrolyte membrane and move to the cathode, and cause an electrochemical reaction with oxygen at the cathode to generate electricity. .

  The air supply port 206 is connected to an oxidant supply unit 204, a heat radiating unit 220, and a cathode humidification unit 222 via an air supply passage, and the air discharge port 210 is connected to an air discharge passage. Then, the air discharge unit 208 is connected.

  A fuel supply unit 212, a pressure control unit 224, an ejector 226, and an anode humidification unit 228 are connected to the hydrogen supply port 214 through a hydrogen supply passage, respectively, and a circulation passage 230 is connected to the hydrogen discharge port 218. A hydrogen discharger 216 is connected via

  The oxidant supply unit 204 includes, for example, a compressor (compressor) (not shown) and a motor that drives the oxidant supply unit. The supply air used as the oxidant gas in the fuel cell stack 202 is adiabatically compressed to compress the fuel cell stack 202. To pump. Supply air is heated during the adiabatic compression. The supply air thus heated contributes to warming up the fuel cell stack 202.

  In addition, the air supplied from the oxidant supply unit 204 is set to a predetermined pressure according to the load of the fuel cell stack 202, the operation amount of an accelerator pedal (not shown), and the like, and is introduced into the fuel cell stack 202. At the same time, after being cooled by a heat radiating section 220 described later, it is supplied as a pilot pressure to the pressure control section 224 via the bypass passage 232.

  The heat radiating unit 220 is constituted by, for example, an intercooler (not shown), and is supplied from the oxidant supply unit 204 during normal operation of the fuel cell stack 202 by exchanging heat with cooling water flowing along the flow path. Cool the supplied air. For this reason, the supply air is cooled to a predetermined temperature and then introduced into the cathode humidification unit 222.

  The cathode humidifying unit 222 includes, for example, a water permeable membrane, and allows air that has been cooled to a predetermined temperature by the heat radiating unit 220 to pass through moisture from one side to the other side of the water permeable membrane. Is supplied to the air supply port 206 of the fuel cell stack 202. The humidified air is supplied to the fuel cell stack 202, and the ionic conductivity of the solid polymer electrolyte membrane of the fuel cell stack 202 is ensured in a predetermined state. Note that an air discharge unit 208 is connected to the air discharge port 210 of the fuel cell stack 202.

  The fuel supply unit 212 includes, for example, a hydrogen gas cylinder (not shown) that supplies hydrogen as fuel for the fuel cell, and stores hydrogen supplied to the anode side of the fuel cell stack 202.

  The pressure control unit 224 includes, for example, a pneumatic proportional pressure control valve. The pressure of the air supplied through the bypass passage 232 is used as a pilot pressure (pilot signal pressure), and the pressure on the outlet side of the pressure control unit 224 is A certain secondary pressure is set to a predetermined range corresponding to the pilot pressure.

  The ejector 226 includes a nozzle unit and a diffuser unit (not shown), and fuel (hydrogen) supplied from the pressure control unit 224 is accelerated and injected toward the diffuser unit when passing through the nozzle unit. When fuel flows from the nozzle portion toward the diffuser portion at a high speed, negative pressure is generated in the side flow chamber provided between the nozzle portion and the diffuser portion, and the anode side discharge is performed via the circulation passage 230. Fuel is aspirated. The fuel mixed in the ejector 226 and the discharged fuel are supplied to the anode humidifying unit 228, and the discharged fuel discharged from the fuel cell stack 202 is provided so as to circulate through the ejector 226.

  Accordingly, the unreacted exhaust gas discharged from the hydrogen discharge port 218 of the fuel cell stack 202 is introduced into the ejector 226 through the circulation passage 230, and the hydrogen supplied from the pressure control unit 224 and the fuel cell stack 202. The exhaust gas discharged from the fuel cell is mixed and supplied to the fuel cell stack 202 again.

  The anode humidifying unit 228 is configured to include, for example, a water permeable membrane, and permeates moisture from one side of the water permeable membrane to the other side, thereby humidifying the fuel derived from the ejector 226 to a predetermined humidity. This is supplied to the hydrogen supply port 214 of the battery stack 202. The humidified hydrogen is supplied to the fuel cell stack 202, and the ionic conductivity of the solid polymer electrolyte membrane of the fuel cell stack 202 is ensured in a predetermined state.

  For example, a hydrogen discharge portion 216 having a discharge control valve (not shown) is connected to the hydrogen discharge port 218 of the fuel cell stack 202 via a circulation passage 230. The discharge control valve is controlled to open and close in accordance with the operating state of the fuel cell stack 202. For example, excessive moisture (mainly liquid water) in the exhaust gas separated by a storage tank (not shown) is external to the vehicle. To be discharged.

  Next, the fuel cell electromagnetic shut-off valve 10 according to the present embodiment provided between the fuel supply unit 212 and the pressure control unit 224 in the fuel cell system 200 is shown in FIGS.

  As shown in FIGS. 2 and 3, the fuel cell electromagnetic shut-off valve 10 (hereinafter simply referred to as the shut-off valve 10) is supplied with hydrogen (hereinafter simply referred to as fluid) through the inlet port 12 and the outlet port 14. A valve body (first body part) 16 to be led out, a sub body (second body part) 18 connected to the upper part of the valve body 16, and an upper part of the sub body 18 are provided, and a movable member 20 is provided therein. A guide body 22 provided to be displaceable along the axial direction, a housing 26 connected to an upper portion of the guide body 22 via an end plate 24, a solenoid portion 28 disposed in the housing 26, The cover member 30 is mounted so as to cover the outside of the housing 26 and the valve seat portion (second valve seat portion) 32 of the valve body 16 is seated and separated. The Rukoto, a valve body 34 for switching the flow state of the fluid.

  The valve body 16 is made of a metal material (for example, aluminum). An inlet port 12 is formed on one side of the valve body 16 and a lead-out port 14 is formed on the other side opposite to the one side. Has been. Further, a communication chamber 36 is formed inside the valve body so as to straddle the sub-body 18, and a valve body 34 is provided in the communication chamber 36 so as to be displaceable along the axial direction. A first passage 38 is formed between the communication chamber 36 and the introduction port 12, and a second passage 40 is similarly formed between the communication chamber 36 and the outlet port 14. In the communication chamber 36, a valve seat 32 is formed that projects annularly toward the valve body 34, and on which the valve body 34 is seated. The valve seat 32 communicates with the second passage 40. Is formed.

  A joint member (not shown) connected to a pipe or the like is connected to the end portion of the introduction port 12 and communicates with the inside of the introduction port 12 through a passage formed inside the joint member.

  The first passage 38 extends substantially horizontally from the introduction port 12 toward the central portion of the valve body 16 and then extends upward at a predetermined angle so that the first passage 38 extends downward from the communication chamber 36. It is connected to the. A filter (removal member) 42 having a substantially U-shaped cross section is integrally mounted in the first passage 38. That is, when dust or the like is contained in the fluid introduced from the introduction port 12, the dust or the like is removed by mounting the bottomed portion of the filter 42 formed in a mesh shape on the communication chamber 36 side. In addition, the dust and the like can be prevented from entering the communication chamber 36.

  Specifically, the opening diameter of the mesh of the filter 42 formed in a mesh shape is set smaller than the passage diameter of the orifice (throttle portion) 66 (described later) formed in the sub body 18. This prevents dust or the like larger than the passage diameter of the orifice 66 from entering the inside of the valve body 16 from the introduction port 12, so that the orifice 66 is not clogged by the dust or the like. Therefore, the fluid introduced from the introduction port 12 can be reliably and stably circulated into the communication chamber 36 through the orifice 66.

  The second passage 40 extends from the valve seat portion 32 to the lower part of the valve body 16 in a substantially vertical direction by a predetermined length, and then extends radially outward to communicate with the outlet port 14. A mounting hole 44 having a diameter smaller than the diameter of the second passage 40 is formed in a lower portion of the second passage 40 extending in the substantially vertical direction. The mounting hole 44 has a fluororesin (for example, , A guide member 46 formed in a cylindrical shape from Teflon (registered trademark) is lightly press-fitted or fitted.

  Further, a ring-shaped flat washer (locking member) 50 is attached to a boundary portion between the second passage 40 and the attachment hole 44 via a step portion 48, and the guide member is inserted into the hole 52 of the flat washer 50. The end of 46 is engaged. As a result, the guide member 46 is in a state in which displacement in the axial direction is restricted by the flat washer 50, so that the guide member 46 does not come out of the mounting hole 44. That is, the flat washer 50 has a function of receiving a valve spring (first elastic member) 158, which will be described later, and a function of preventing the guide member 46 from being detached from the mounting hole 44.

  On the other hand, a first communication passage 54 communicating with the communication chamber 36 is formed in the valve body in the vicinity of the outlet port 14. In other words, the first communication passage 54 is not formed on the introduction port 12 side of the valve body 16. The first communication passage 54 extends from the inner side surface of the communication chamber 36 so as to be slightly inclined downward, and then extends vertically upward and penetrates into the sub body 18.

  Further, an O-ring (seal member) 56 is attached to an end face of the valve body 16 facing the sub-body 18 via an annular groove, and a communication chamber when the valve body 16 and the sub-body are connected by the O-ring 56. The airtightness of 36 is reliably maintained.

  Further, an annular recess 58 is formed on the end surface of the valve body 16 in the radially inward direction from the annular groove. A peripheral edge 62 of a diaphragm (flexible member) 60 described later is attached to the concave portion 58 and is sandwiched between the concave portion 58 and the end surface of the sub body 18.

  In this way, by arranging the O-ring 56 provided in the annular groove in the radially outward direction from the recess 58 in which the peripheral edge 62 of the diaphragm 60 is sandwiched, the O-ring 56 is added to the peripheral edge 62 of the diaphragm 60. Thus, the airtightness of the communication chamber 36 is reliably maintained. Therefore, fluid leakage from between the valve body 16 and the sub body can be prevented.

  Specifically, since the peripheral edge 62 of the diaphragm 60 is mounted on the recess 58 so that the upper surface thereof is substantially flush with the end face of the valve body 16, the peripheral edge 62 and the end face of the sub-body 18 are separated from each other. Although the sealing performance is relatively small only by contact, by providing the O-ring 56 radially outward from the peripheral edge portion 62, the airtightness of the communication chamber 36 can be reliably maintained as a double seal structure.

  On the other hand, a portion extending in a substantially vertical direction in the first communication passage 54 is formed so as to be between the recess 58 in which the peripheral edge 62 of the diaphragm 60 is mounted and the O-ring 56 (see FIG. 1). ). Accordingly, even when the fluid flowing through the first communication passage 54 leaks through between the valve body 16 and the sub body 18, the peripheral portion 62 and the O-ring 56 attached to the concave portion 58 cause the outside of the fluid. Leakage to can be prevented.

  The sub body 18 is formed in a substantially cylindrical shape, and is integrally connected to the end surface of the valve body 16 via a connecting bolt (not shown).

  Further, in the sub body 18, a second communication passage 64 is formed in the vicinity of the first communication passage 54 formed in the valve body 16 and opens in the communication chamber 36 and extends outward in the radial direction. . Between the second communication path 64 and the first communication path 54 formed in the sub-body 18, an orifice 66 whose diameter is narrower than that of the first and second communication paths 54 and 64 is formed. That is, the first communication path 54 and the second communication path 64 communicate with each other through the orifice 66.

  Further, by changing the passage diameter of the orifice 66, the flow rate of the fluid flowing from the first communication chamber 36a to the second communication chamber 36b via the orifice 66 can be controlled with high accuracy.

  The first and second communication passages 54 and 64 and the orifice 66 may be formed at a position away from the position near the introduction port 12. Furthermore, the position farthest from the introduction port 12 is preferable. For example, in FIG. 3, it is preferable to form the valve body 16 and the sub body 18 at a position near the outlet port 14 (see FIG. 2). Thereby, the flow rate does not become unstable due to the flow velocity of the fluid introduced from the introduction port 12, and the fluid is passed to the second communication chamber 36 b through the first and second communication passages 54 and 64 and the orifice 66. It can be stably supplied at a desired flow rate, and the pressure in the second communication chamber 36b can be stabilized.

  The guide body 22 is made of a metal material (for example, stainless steel) and is integrally connected to the upper portion of the sub body 18. The guide body 22 extends in a cylindrical shape along the axial direction at the upper portion of the guide body 22, and a cylindrical portion 68 inserted into a bobbin 76 described later, and a radially outward direction at the lower portion of the cylindrical portion 68. And a flange portion 70 that is mounted on an end portion of the sub body 18, extends in a cylindrical shape from the flange portion 70 toward the sub body 18, and is inserted into the sub body 18. And an insertion portion 72.

  The cylindrical portion 68 is formed in a thin plate cylindrical shape, and a support hole 74 is formed inside the movable portion 20 so as to be displaceable along the axial direction. The cylindrical portion 68 is inserted so as to abut on an insertion hole of a bobbin 76 described later and a through hole 86 (described later) of the end plate 24, and the upper end portion of the cylindrical portion 68 is, for example, laser welded. For example, it is fixed to a fixing member 104 (described later).

  An annular seal member 82 is mounted in a space surrounded by the outer peripheral surface of the cylindrical portion 68, the insertion hole 80 of the housing 26 through which the cylindrical portion 68 is inserted, and the upper surface of the end plate 24. That is, the sealing member 82 keeps the airtightness of the solenoid portion 28 inside.

  The insertion portion 72 is formed to have a diameter slightly larger than that of the cylindrical portion 68, and the insertion portion 72 is inserted into the insertion hole 84 of the sub body 18 and integrally connected thereto. At this time, since an O-ring 56 is attached to the outer peripheral surface of the insertion portion 72 via an annular groove, the O-ring 56 abuts against the inner wall surface of the sub body 18, thereby The airtightness between the sub body 18 is maintained.

  The end plate 24 is formed in an annular shape from a metal material made of a magnetic material, and is integrally disposed on the upper portion of the flange portion 70 in the guide body 22. A through hole 86 penetrating along the axial direction is formed at a substantially central portion of the end plate 24, and the cylindrical portion 68 of the guide body 22 is inserted therethrough.

  The housing 26 is formed by integral molding from a resin material and is connected to the upper portion of the end plate 24. A connector portion 88 connected to a power source (not shown) for supplying current to the solenoid portion 28 is provided on the side surface of the housing 26, and the connector portion 88 is made of metal so that one end portion is exposed inside. A terminal 90 made of a material is provided. The terminal 90 is connected to the bobbin 76 of the solenoid unit 28 through the inside of the housing 26. The terminal 90 is connected to the power supply via a lead wire (not shown).

  In addition, a protruding portion 92 that protrudes radially inward is formed on the upper surface of the housing 26, and an O-ring 56 is attached via an annular groove formed on the upper surface of the protruding portion 92. The O-ring 56 is sandwiched between the housing 26 and a cover member 30 described later, whereby the airtightness between the housing 26 and the cover member 30 is maintained.

  The cover member 30 is formed of a metal material made of a magnetic material and has a substantially U-shaped cross section, and is mounted so as to surround the housing 26 and the end plate 24 from above. As a result, the end plate 24 can be prevented from falling off between the guide member 46 and the housing 26. A hole 96 is formed in the substantially central portion of the cover member 30, and a screw 98 provided on the upper surface of a fixing member 104 (described later) is inserted through the hole 96.

  The solenoid portion 28 is disposed so as to be surrounded by the interior of the housing 26, and a bobbin 76 around which the coil 100 is wound on the outer peripheral surface, and a movable portion that is displaceable along the axial direction in the bobbin 76. The member 20 includes a fixed member 104 that is integrally connected to the upper portion of the housing 26 via a cap nut 102 and is disposed so as to face the movable member 20.

  The bobbin 76 is provided so as to come into contact with the inner peripheral surface of the housing 26, and first and second diameter-expanded portions 106 and 108 that are expanded radially outward are formed at the upper end portion and the lower end portion, respectively. ing. The housing 100 is integrally formed with the coil 100 wound between the first enlarged diameter portion 106 and the second enlarged diameter portion 108.

  The first enlarged diameter portion 106 is provided so as to contact the lower surface side of the overhanging portion 92 of the housing 26, and the lower surface of the second enlarged diameter portion 108 is connected to the convex portion 112 of the housing 26 via the annular groove portion 110. Is engaged. That is, the bobbin 76 around which the coil 100 is wound is integrally engaged with the inside of the housing 26 so that the entire bobbin 76 is surrounded.

  A fixing member 104 formed in a cylindrical shape by a metal material made of a magnetic material is inserted into the bobbin 76, and a cylindrical portion 68 of the guide body 22 is interposed below the fixing member 104. The movable member 20 is inserted.

  After the screw portion 98 formed on the upper portion of the fixing member 104 is inserted into the hole portion 96 of the cover member 30, the washer 114 is inserted and the cap nut 102 is screwed, whereby the fixing member 104 is inserted. The housing 26 is integrally connected.

  Further, a recessed portion 116 is formed on the lower surface of the fixed member 104, which is recessed by a predetermined depth toward the upper side away from the movable member 20.

  The movable member 20 is made of a metal material made of a magnetic material, and protrudes toward the fixing member 104 side of the substantially cylindrical main body 118 that is provided so as to be displaceable along the inside of the cylindrical portion 68. It consists of the protrusion 120 formed.

  A spring receiving portion 122 projecting radially outward is formed at the lower end portion of the main body portion 118, and a return spring (second elastic member) 124 is interposed between the spring receiving portion 122 and the guide body 22. Yes. The elastic force of the return spring 124 is biased in a direction (arrow B direction) that displaces the movable member 20 toward the valve seat portion 32 of the valve body 16.

  A pilot valve seat portion (first valve seat portion) made of an elastic material such as rubber is provided at a substantially central portion of the main body portion 118 facing the valve seat portion 32 through a hole portion 126 recessed at a predetermined depth. 128 is attached. The pilot valve seat portion 128 is disposed at a position that is recessed from the lower end surface of the movable member 20 to the fixed member 104 side by a predetermined depth. Thus, the pilot valve seat portion 128 formed of an elastic material is made of a metal material and a seat function that closes the pilot port (passage) 140 when the pilot valve portion (first valve portion) 132 is seated. It also has a silencing function that prevents the generation of contact noise when the pilot valve section 132 is seated.

  On the other hand, the projecting portion 120 of the movable member 20 is formed to have a diameter reduced inward in the radial direction with respect to the main body portion 118. Inserted. The protrusion 120 is provided with an elastic member (third elastic member) 130 having a predetermined thickness on the end surface facing the recess 116. The elastic member 130 is formed of an elastic material such as rubber, for example, and when the projecting portion 120 is inserted into and contacted with the recessed portion 116 under the displacement action of the movable member 20, the shock is buffered and contacted. It is possible to prevent the generation of contact sound caused by the above.

The valve body 34 is formed, for example, in a substantially cross shape from a metal material such as stainless steel. The valve body 34 is formed on the movable member 20 side, the pilot valve portion 132 seated on the pilot valve seat portion 128 of the movable member 20, and the diameter of the valve body 34 is increased radially outward from the pilot valve portion 132. A main valve portion ( second valve portion) 134 that is seated on the valve seat portion 32 and a guide shaft portion (guide portion) 136 that is displaceably guided by a guide member 46 that is mounted in the mounting hole 44 of the valve body 16. It consists of.

  A pilot passage 138 penetrating along the axial direction is formed inside the valve body 34, and a pilot valve portion 132 communicates with the pilot passage 138 and has a smaller passage diameter than the pilot passage 138. A port 140 is formed. The pilot port 140 has a passage diameter larger than that of the orifice 66 formed in the sub-body 18.

  The pilot valve portion 132 is provided so as to be seated / separated with respect to the pilot valve seat portion 128 mounted on the movable member 20 under a displacement action along the axial direction thereof, and an upper surface facing the pilot valve seat portion 128 is provided. The pilot port 140 is gradually inclined downward in the radially outward direction from the substantially central portion where the pilot port 140 is opened.

  A screw 142 is engraved between the pilot valve portion 132 and the main valve portion 134 along the peripheral surface thereof, and a thin film diaphragm 60 made of a resin material is inserted therethrough. Then, the diaphragm 60 is integrally provided with respect to the valve body 34 by screwing the fixing nut 146 through the retainer 144 and the washer 114 while the diaphragm 60 is in contact with the upper surface of the main valve portion 134. It is done.

  The diaphragm 60 is formed with a flexible skirt portion 148 extending radially outward from a substantially central portion fixed to the valve body 34, and a peripheral portion 62 of the skirt portion 148 includes a valve body 16. Is inserted into a recess 58 formed on the end surface of the valve body, and is sandwiched between the valve body 16 and the sub body. Thereby, the communication chamber 36 formed inside the valve body 16 and the sub body 18 includes a first communication chamber 36a formed on the valve body 16 side by the diaphragm 60 and a second communication chamber 36b formed on the sub body 18 side. And divided.

  The retainer 144 is formed in a thin plate shape from a metal material, and its peripheral edge is curved in a direction away from the diaphragm 60.

  The main valve portion 134 is formed to have a diameter larger than the pilot valve portion 132 in the radially outward direction, and is disposed inside the first communication chamber 36 a in the valve body 16. The outer diameter of the main valve portion 134 is set larger than the diameter of the valve seat portion 32 formed in the valve body 16.

  In addition, a seat portion (fourth elastic member) made of an elastic material such as rubber is formed on the seating surface 150 serving as the lower surface of the main valve portion 134 via an annular mounting groove 152 that is recessed from the seating surface 150 by a predetermined depth. 154 is provided. On the other hand, the upper surface of the main valve portion 134 is filled with an elastic material connected to the seat portion 154 via an annular groove 156 communicating with the mounting groove 152.

  The seat portion 154 is mounted at a position where the seat portion 154 contacts the valve seat portion 32 when the main valve portion 134 is displaced toward the valve seat portion 32 (in the direction of arrow B). The sheet portion 154 is formed by filling the mounting groove 152 with an elastic material and solidifying it. At this time, for example, the elastic material is filled into the annular groove 156 by filling the mounting groove 152 with the elastic material, so that the seat portion 154 can be easily integrally formed and can be easily and efficiently mounted. .

  Thus, the seat part 154 formed of an elastic material is seated on the valve seat part 32 made of a metal material and a seat function for closing the valve seat part 32 when the main valve part 134 is seated on the valve seat part 32. It also has a mute function to prevent contact sound when it is done.

  On the other hand, a valve spring 158 is interposed between the flat washer 50 attached to the valve body 16 and the main valve portion 134. The valve spring 158 is formed in a tapered shape that gradually increases in diameter from one end side engaged with the main valve portion 134 side toward the other end side engaged with the flat washer 50 side. The elastic force 158 urges the valve body 34 including the main valve portion 134 in a direction (arrow A direction) in which the valve body 34 is separated from the valve seat portion 32.

  Specifically, one end portion of the valve spring 158 is engaged with a corner portion where the seating surface 150 of the main valve portion 134 and the guide shaft portion 136 are joined, and the other end portion is connected to the upper surface of the flat washer 50 and the valve body 16. The step 48 is engaged with a corner formed by the inner wall surface.

  In this way, the valve spring 158 is formed in a tapered shape so that the diameter of the main valve portion 134 as one end portion is reduced, so that the main valve portion 134 always has a valve seat under the elastic action of the valve spring 158. It is adjusted in the radial direction so as to be the center (axial center) of the portion 32.

  Further, by expanding the valve spring 158 in a tapered shape, the valve spring 158 and the guide shaft portion 136 of the valve body 34 can be spaced apart from each other by a predetermined distance in the radial direction. It is possible to prevent contact with the valve spring 158 when displacing along.

  Further, since the outer peripheral portion of the flat washer 50 is pressed against the stepped portion 48 of the valve body 16 by the elastic force of the valve spring 158, the flat washer 50 does not fall off from the stepped portion 48.

  The guide shaft portion 136 extends downward from the main valve portion 134 by a predetermined length, and is substantially the same as a pilot passage 138 formed inside the guide shaft portion 136 at a substantially central portion along the axial direction. An orthogonal communication hole 160 is formed. The communication hole 160 is formed so as to penetrate the outer peripheral surface of the guide shaft portion 136, and communicates with the pilot passage 138 and the communication hole 160. The guide shaft portion 136 is guided to be displaceable along the axial direction by being inserted into the guide hole 162 of the guide member 46 made of a resin material.

  As shown in FIG. 4, instead of the guide member 46 and the flat washer 50 mounted on the valve body 16, a cylindrical guide member 166 having a flange 164 protruding radially outward on one end side is provided. You may make it provide. The guide member 166 is formed of a resin material and can be lightly press-fitted or fitted into the mounting hole 44 of the valve body 16 made of a metal material. At this time, the flange portion 164 is engaged with a step portion 48 formed in the mounting hole 44 of the valve body 16.

  As a result, the other end portion of the valve spring 158 can be held by the guide member 166 via the flange portion 164, and the guide member 166 is attached to the mounting hole 44 of the valve body 16 by the elastic force of the valve spring 158. It is possible to hold it. Therefore, the flat washer 50 required for the above-described guide member 46 is not necessary, and the number of parts can be reduced and the cost can be reduced, and accordingly, the assembly workability can be improved. . Further, since the guide member 46 can be press-fitted into the valve body 16 by forming the guide member 46 from a metal material (for example, DU bush), the guide member 46 is inserted into the mounting hole 44. There is no withdrawal. For this reason, it is not necessary to provide the flat washer 50 and the collar portion 164, and the number of parts can be reduced.

  The fuel cell electromagnetic shut-off valve 10 according to the embodiment of the present invention is basically configured as described above. Next, the operation and effects thereof will be described. 2 and 3 are in a non-excited state where no current is supplied to the coil 100 of the solenoid section 28, the pilot valve section 132 of the valve body 34 is seated on the pilot valve seat section 128, and the main valve The part 134 is seated on the valve seat 32 and shows an off state in which the flow of fluid between the inlet port 12 and the outlet port 14 is blocked.

  First, in such an off state, by introducing a fluid from the introduction port 12, the fluid is introduced into the first communication chamber 36 a through the first passage 38. At that time, when the fluid passes through the filter 42 attached to the first passage 38, dust or the like contained in the fluid is surely removed by the filter 42, and dust is contained in the first communication chamber 36 a. Etc. can be prevented from entering.

  In addition, a part of the fluid introduced into the first communication chamber 36 a is introduced from the first communication passage 54 into the second communication chamber 36 b through the orifice 66 and the second communication passage 64. That is, the fluid introduced from the introduction port 12 into the valve body 16 is supplied to the first communication chamber 36a and the second communication chamber 36b via the first and second communication passages 54 and 64, respectively. For this reason, the pressure in the first communication chamber 36 a and the pressure in the second communication chamber 36 b are substantially equal via the diaphragm 60. In other words, there is no pressure difference between the pressure in the first communication chamber 36a and the pressure in the second communication chamber 36b.

  Next, when the coil 100 is energized from a power source (not shown) through the terminal 90 of the connector unit 88, the coil 100 is excited, and magnetic flux is generated from the coil 100 to the main body of the movable member 20 under the exciting action of the coil 100. It is generated so that it goes to 118 and returns to the coil 100 again to circulate.

  Then, as shown in FIG. 5, the movable member 20 is displaced toward the fixed member 104 side (arrow A direction) against the elastic force of the return spring 124 under the excitation action of the coil 100. The pilot valve seat portion 128 seated on the end face of the pilot valve portion 132 is separated from the pilot valve portion 132. In this case, the main valve portion 134 of the valve body 34 is in a state of being seated on the valve seat portion 32.

  As a result, the fluid introduced into the second communication chamber 36b flows from the communication hole 160 to the second passage 40 through the pilot port 140 and the pilot passage 138 of the pilot valve portion 132, and is discharged from the outlet port 14 to the outside. The At this time, the pressure in the second communication chamber 36b is lower than the pressure in the first communication chamber 36a, and a pressure difference is generated between the pressure in the second communication chamber 36b and the pressure in the first communication chamber 36a. Occurs.

  Specifically, since the fluid is introduced into the second communication chamber 36b through the orifice 66 provided between the first communication passage 54 and the second communication passage 64, the passage diameter of the orifice 66 is reduced. The flow rate of the fluid led out from the second communication chamber 36b through the pilot port 140 having a larger passage diameter is larger than the flow rate of the fluid introduced into the second communication chamber 36b through the orifice 66. That is, by providing the orifice 66, the pressure in the second communication chamber 36b is set to gradually decrease.

  As a result, as shown in FIG. 6, the pressing force generated by the pressure difference between the first communication chamber 36 a and the second communication chamber 36 b is applied to the diaphragm 60 from below to above (arrow A direction). In addition, in addition, the elastic force of the valve spring 158 is applied to the valve body 34, whereby the valve body 34 is displaced toward the movable member 20 and the main valve portion of the valve body 34 is displaced. The seating surface 150 of 134 is separated from the valve seat portion 32.

  As a result, the communication cut-off state between the first communication chamber 36a and the outlet port 14 by the main valve portion 134 is released, and the fluid introduced from the introduction port 12 into the first communication chamber 36a is transferred from the valve seat portion 32 to the second. It flows through the passage 40 to the outlet port 14 and is discharged to the outside.

  In this case, the elastic force Pr of the return spring 124 is a value obtained by integrating the maximum value Gmax of the vibration acceleration G generated in the shutoff valve 10 in an environment where the shutoff valve 10 is used with respect to the dead weight W of the movable member 20. (W × Gmax) is canceled (cancelled) by the electromagnetic force of the solenoid unit 28, and the pressing force Pd applied to the diaphragm 60 due to the pressure difference between the first communication chamber 36a and the second communication chamber 36b, The resultant force with the elastic force Ps of the valve spring 158 is set to be larger than a value obtained by integrating the maximum value Gmax of the vibration acceleration G of the main valve part 134 and the own weight W ((W × Gmax) <Pd + Ps). ).

  Thus, when the main valve portion 134 is separated from the valve seat portion 32, the pressing force Pd to the diaphragm 60 due to the pressure difference between the first and second communication chambers 36a and 36b and the resilience of the valve spring 158. The resultant force with Ps overcomes and the valve open state is suitably maintained.

  On the other hand, when the main valve portion 134 is seated on the valve seat portion 32, the elastic force Pr of the return spring 124 is transferred to the diaphragm 60 due to the pressure difference between the first and second communication chambers 36a and 36b. The valve closed state is suitably maintained by overcoming the pressing force Pd and the spring force Ps of the valve spring 158. Further, a value (W × Gmax) obtained by integrating the maximum value Gmax of the vibration acceleration G generated in the shutoff valve 10 in an environment where the shutoff valve 10 is used is added to the dead weight W of the movable member 20 and the main valve portion 134. Thus, even when the shutoff valve 10 vibrates at the maximum value Gmax of the vibration acceleration G, the valve open / closed state of the valve body 34 is reliably maintained and the valve body 34 can be freely displaced. Is possible.

  Further, in order to stop the flow of the fluid in such an on state, the coil 100 is brought into a non-excited state by stopping the current that has been supplied to the coil 100 from a power source (not shown), and the movable member 20. The displacement force toward the fixing member 104 that has been urged by the main body portion 118 disappears. Therefore, when the movable member 20 is pressed toward the valve seat portion 32 (in the direction of arrow B) by the spring force of the spring, the pilot valve seat portion 128 provided on the movable member 20 becomes the pilot valve portion of the valve body 34. Sit to 132. Thereby, the flow of the fluid led out from the second communication chamber 36b to the lead-out port 14 through the pilot passage 138 is blocked, and accordingly, the fluid is generated between the first communication chamber 36a and the second communication chamber 36b. The pressure difference disappears. As a result, the valve body 34 is seated on the valve seat portion 32 of the valve body 16 via the seating surface 150 of the main valve portion 134. As a result, the communication state between the communication chamber 36 and the outlet port 14 is turned off. As a result, the derivation of the fluid introduced from the introduction port 12 from the derivation port 14 is stopped.

  As described above, in the shutoff valve 10 according to the present embodiment, the diaphragm 60 is mounted between the main valve portion 134 and the pilot valve portion 132 in the valve body 34, and the peripheral portion 62 of the diaphragm 60 is connected to the valve body 16. Between the valve body 16 and the sub body 18, the communication chamber 36 formed inside the valve body 16 and the sub body 18 is connected to the first communication chamber 36a on the valve body 16 side and the second communication chamber 36 side on the sub body 18 side. The chamber 36b is divided.

  When the movable member 20 is displaced upward under the excitation action of the solenoid portion 28, the fluid introduced into the first communication chamber 36a is transferred to the second communication chamber 36b through the first and second communication passages 54 and 64. In the second communication chamber 36b, the pilot valve portion 132 of the valve body 34 is separated from the pilot valve seat portion 128, so that the fluid is led out to the lead-out port 14 through the pilot passage 138. As a result, the pressure in the second communication chamber 36b is reduced with respect to the pressure in the first communication chamber 36a, so that an upward pressing force generated by the pressure difference is applied to the diaphragm 60, and the diaphragm 60 passes through the diaphragm 60. The valve body 34 can be separated from the valve seat portion 32.

  As described above, the first and second communication chambers 36a and 36b are provided in the shut-off valve 10, and a fluid pressure difference is generated in the first and second communication chambers 36a and 36b. Without being affected by upstream and downstream pressures in a fluid passage (not shown) to which the valve body 34 is connected, the valve element 34 is caused by a pressure difference generated between the first communication chamber 36a and the second communication chamber 36b. It becomes possible to displace reliably and quickly. Therefore, it is possible to improve the responsiveness when the valve body 34 is seated on and removed from the valve seat portion 32 as compared with the conventional shutoff valve.

  Further, by setting the passage diameter of the pilot port 140 formed in the pilot valve portion 132 to be larger than the passage diameter of the orifice 66 formed in the sub body 18, the second communication chamber 36 b is passed from the first communication chamber 36 a through the orifice 66. The flow rate flowing from the pilot port 140 to the derivation port 14 via the pilot passage 138 can be increased with respect to the flow rate flowing to the outlet. Therefore, it is possible to suitably reduce the pressure in the second communication chamber 36b and increase the pressure difference generated between the second communication chamber 36b and the first communication chamber 36a.

  Furthermore, a spring is provided inside the communication chamber 36 by providing the valve spring 158 so as to face the outlet port 14 between the seating surface 150 of the main valve portion 134 and the flat washer 50 attached to the valve body 16. Compared with the configuration, the communication chamber 36 can be downsized. Further, since the resilient force of the valve spring 158 is biased in the direction of pressing the valve body 34 toward the movable member 20, the valve body 34 can follow the displacement of the movable member 20. As a result, by reducing the size of the communication chamber 36, the fluid can be quickly filled and exhausted in the communication chamber 36. Accordingly, when the valve body 34 is displaced along the axial direction. Responsiveness can be improved.

  Furthermore, a cylindrical guide member 46 is provided in the mounting hole 44 of the valve body 16, and the guide shaft portion 136 of the valve body 34 is inserted into the guide hole 162 of the guide member 46. Then, by guiding the valve body 34 through the guide shaft portion 136 so as to be displaceable along the axial direction, the main valve portion 134 of the valve body 34 is prevented from tilting (falling) and being displaced in the radial direction. Can do. Therefore, a further seating effect when the main valve portion 134 is seated on the valve seat portion 32 is obtained, and a seating effect when the pilot valve portion 132 is seated on the pilot valve seat portion 128 is further obtained.

  Furthermore, the guide member 46 is made of, for example, a fluororesin such as Teflon (registered trademark), so that the guide shaft portion 136 of the valve body 34 is guided in a freely displaceable manner along the guide hole 162 of the guide member 46. Slidability can be improved.

  Further, since a flat washer 50 is mounted on the upper end portion of the guide member 46 via a stepped portion 48 formed in the valve body 16, the flat washer 50 can be lightly press-fitted into the mounting hole 44 of the valve body 16. It is possible to prevent the inserted guide member 46 from being pulled out.

1 is a schematic block configuration diagram of a fuel cell system incorporating a fuel cell electromagnetic shut-off valve according to an embodiment of the present invention. It is a longitudinal cross-sectional view of the electromagnetic shut-off valve for fuel cells which concerns on embodiment of this invention. FIG. 3 is an enlarged longitudinal sectional view in the vicinity of a valve body of the fuel cell electromagnetic shut-off valve of FIG. 2. FIG. 4 is an enlarged longitudinal sectional view in the vicinity of the valve body showing a state in which a guide member having a flange is mounted in the mounting hole of the valve body in FIG. 3. 4 is an enlarged longitudinal sectional view showing a state in which the movable member is displaced upward in the electromagnetic shut-off valve for the fuel cell of FIG. 6 is an enlarged longitudinal sectional view showing a state in which the valve body is displaced upward in the electromagnetic shut-off valve for the fuel cell of FIG. 5 and the main valve portion of the valve body is separated from the valve seat portion of the valve body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Fuel cell electromagnetic shut-off valve 12 ... Introducing port 14 ... Deriving port 16 ... Valve body 18 ... Sub-body 20 ... Movable member 22 ... Guide body 24 ... End plate 26 ... Housing 28 ... Solenoid part 30 ... Cover member 32 ... Valve seat Portion 34 ... Valve body 36 ... Communication chamber 36a ... First communication chamber 36b ... Second communication chamber 42 ... Filter 46, 166 ... Guide member 50 ... Flat washer 54 ... First communication passage 60 ... Diaphragm 64 ... Second communication passage 66 ... orifice 68 ... cylindrical part 76 ... bobbin 88 ... connector part 100 ... coil 104 ... fixing member 122 ... spring receiving part 124 ... return spring 128 ... pilot valve seat part 130 ... elastic member 132 ... pilot valve part 134 ... main valve part 136 ... guide shaft portion 138 ... pilot passage 150 ... seat surface 158 ... valves Pulling 160 ... Communication hole 164 ... Buttocks

Claims (15)

In an electromagnetic shut-off valve for a fuel cell that shuts off the supply of reactant gas in the fuel cell,
An introduction port through which the reaction gas is introduced, a discharge port through which the reaction gas introduced from the introduction port is discharged, and a valve body having a communication chamber communicating with the introduction and discharge ports;
A solenoid portion provided inside the housing connected to the valve body, and having an exciting action by an electric current;
A movable member provided so as to face a fixed member provided inside the solenoid part, and displaced along an axial direction under the excitation action of the solenoid part;
A flexible member that is provided inside the communication chamber, is attached to the valve body, bends as the valve body is displaced, and divides the communication chamber;
A first valve portion that can be seated / separated with respect to a first valve seat portion mounted on the movable member, and a second valve portion that can be seated / separated with respect to a second valve seat portion formed on the valve body. a valve body having a door,
A communication passage formed in the valve body and communicating with one communication chamber and the other communication chamber divided by the flexible member;
With
The first valve portion is disposed on the movable member side with respect to the flexible member, and the second valve portion is disposed on the valve body side adjacent to the flexible member , Is formed on the second valve seat portion side from the second valve portion, and is formed with a guide portion that is guided to be displaceable along the axial direction with respect to the valve body. Between the second valve portion and the valve body, and the second valve portion is disposed on the radially outer side of the guide portion in the passage from the second valve seat portion. together with the first elastic member for urging in a direction to separate is provided an electromagnetic fuel cell pilot passage communicating to said outlet port from said first valve portion and said Rukoto formed inside the guide portion Shut-off valve. The electromagnetic shut-off valve for a fuel cell according to claim 1 ,
Before Symbol first elastic member, the electromagnetic cut-off valve for a fuel cell characterized by being formed in a tapered shape. The electromagnetic shut-off valve for a fuel cell according to claim 1,
The electromagnetic shut-off valve for a fuel cell, wherein the valve body is provided with a cylindrical guide member that holds the guide portion movably along the axial direction. The electromagnetic shut-off valve for a fuel cell according to claim 3,
The electromagnetic shut-off valve for a fuel cell, wherein the guide member is made of a fluororesin and is fitted into the valve body. The electromagnetic cutoff valve for a fuel cell according to claim 3 or 4,
The guide member has an end surface facing the second valve portion locked in an axial direction by a locking member provided on the valve body, and the locking member is interposed between the second valve portion and the second valve portion. An electromagnetic shut-off valve for a fuel cell, wherein one elastic member is interposed. The electromagnetic shut-off valve for a fuel cell according to claim 3,
The fuel shut-off solenoid valve according to claim 1, wherein the guide member is formed of a resin material, and a flange portion having a diameter increased radially outward is formed at an end portion facing the second valve portion. The electromagnetic shut-off valve for a fuel cell according to claim 1,
An electromagnetic shut-off valve for a fuel cell, characterized in that the communication passage is provided with a throttle portion for restricting the flow rate of the reaction gas flowing through the communication passage. The electromagnetic cutoff valve for a fuel cell according to claim 7,
The electromagnetic shut-off valve for a fuel cell, wherein the throttle portion is provided at a position separated from the introduction port in the valve body. The electromagnetic cutoff valve for a fuel cell according to claim 8,
A mesh-like removal member for removing dust contained in the reaction gas is provided inside the introduction port, and the opening diameter of the mesh of the removal member is set smaller than the passage diameter of the throttle portion. An electromagnetic shut-off valve for fuel cells. The electromagnetic cutoff valve for a fuel cell according to claim 7,
An electromagnetic shut-off valve for a fuel cell, wherein a passage diameter of the pilot passage is set larger than a passage diameter of the throttle portion. The electromagnetic shut-off valve for a fuel cell according to claim 1,
The flexible member is sandwiched between a first body part and a second body part, the peripheral part of the flexible member constituting the valve body, and between the first body part and the second body part. The fuel cell electromagnetic shut-off valve is characterized in that a seal member is provided radially outward from a portion where the peripheral edge is sandwiched. The electromagnetic cutoff valve for a fuel cell according to claim 11,
The electromagnetic shut-off valve for a fuel cell, wherein the communication path is formed in the valve body between a portion where a peripheral edge of the flexible member is sandwiched and the seal member. The electromagnetic shut-off valve for a fuel cell according to claim 1,
The fuel cell electromagnetic shut-off valve, wherein the movable member is provided with a third elastic member made of an elastic material between the movable member and the fixed member. The electromagnetic shut-off valve for a fuel cell according to claim 1,
The electromagnetic shut-off valve for a fuel cell, wherein the first valve seat portion on which the first valve portion is seated is made of an elastic material. The electromagnetic shut-off valve for a fuel cell according to claim 1,
The electromagnetic shut-off valve for a fuel cell, wherein the second valve portion is provided with a fourth elastic member made of an elastic material on one end surface side seated on the second valve seat portion.

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