JP2011065762A - Solenoid valve for fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solenoid valve for a fuel cell capable of adjusting a flow rate of fluid such as air. <P>SOLUTION: The solenoid valve 1 for a fuel cell is equipped with a leading-in port 10a and a leading-out port 10b, a communicating chamber 10c installed between the leading-in port 10a and the leading-out port 10b, a communicating path R1 to communicate the communicating chamber 10c and the leading-out port 10b, a valve seat face 91a installed at an opening on the communicating chamber 10c side of the communicating path R1, and a valve part 72 installed capable of leaving from or seating to the valve seat face 91a. The communicating path R1 is opened and closed by leaving and seating of the valve part 72 from and to the valve seat face 91a, and air led out from the leading-out port 10b is supplied to a dilution unit as dilution air. A leak path 10e for directly communicating between the leading-in port 10a and the leading-out port 10b is fitted separately from the communicating chamber 10c and the communicating path R1, and it 10e is always opened so as to communicate the leading-in port 10a and the leading-out port 10b. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a solenoid valve for a fuel cell that discharges gas and / or water from the fuel cell to the outside, for example, in a fuel cell system.

  Conventionally, a solid polymer membrane fuel cell is a stack in which a plurality of cells are stacked on a cell formed by sandwiching a solid polymer electrolyte membrane between an anode and a cathode from both sides (hereinafter referred to as a fuel cell). ), Hydrogen is supplied to the anode as fuel, air is supplied to the cathode as oxidant, and hydrogen ions generated by the catalytic reaction at the anode move through the solid polymer electrolyte membrane to the cathode. As a result, an electrochemical reaction occurs at the cathode to generate electricity.

  Such a fuel cell device includes, for example, an air compressor for supplying air as a reaction gas to the cathode side of the fuel cell, and further uses the pressure of the air as a signal pressure at a pressure corresponding to the pressure of the air. A pressure control valve for supplying hydrogen as a reaction gas to the anode side of the fuel cell is provided, the pressure of the reaction gas on the anode side with respect to the cathode side of the fuel cell is regulated to a predetermined pressure, and a predetermined power generation efficiency is ensured. It is set so that a predetermined output can be obtained by controlling the flow rate of the reaction gas supplied to.

  Therefore, the present applicant has proposed a fuel cell solenoid valve that is provided at an appropriate position of the air flow path and / or the hydrogen flow path in the fuel cell and discharges air, hydrogen, or water to the outside of the fuel cell. (See Patent Document 1).

JP 2006-153207 A

  Such a solenoid valve for a fuel cell is a valve that can switch between a valve open state in which air or the like can flow and a valve closed state in which air or the like cannot flow. By the way, as the fuel cell system becomes complicated and highly functional, various functions have been desired for the fuel cell solenoid valve. For example, when supplying dilution air to a diluter that dilutes hydrogen discharged from a fuel cell, there is a desire to adjust the flow rate of the supplied air.

  The present invention has been made in view of the above-described demand, and an object thereof is to provide a fuel cell solenoid valve capable of adjusting the flow rate of a fluid such as air.

  To achieve the above object, the present invention includes an introduction port into which a fluid is introduced, a derivation port from which the fluid is led out, a communication chamber provided between the introduction port and the derivation port, A communication passage for communicating the communication chamber and the outlet port; a valve seat provided in the communication chamber-side opening of the communication passage; and a seat that is housed in the communication chamber and separated from the valve seat. A valve portion provided so as to be seatable, and the communication path is opened and closed by the seating / seating of the valve portion with respect to the valve seat, and the fluid led out from the lead-out port is a diluter The fuel cell solenoid valve is provided with a leak passage that directly communicates the introduction port and the lead-out port, and is provided separately from the communication chamber and the communication passage. The introduction port and the lead Wherein the port and is open at all times so as to communicate.

  In such a fuel cell solenoid valve, in a state where the valve portion is seated on the valve seat (first state), only the leak passage that is closed so that the communication passage is closed and the introduction port and the discharge port are always in communication is closed. When a relatively small flow rate fluid is discharged through the valve section and the valve portion is separated from the valve seat (second state), a relatively large flow rate fluid is discharged through the communication path and the leak path. Therefore, the fuel cell solenoid valve can adjust the flow rate of the dilution fluid supplied to the diluter.

  The leak passage preferably includes an orifice through which the fluid flows.

  Such a fuel cell solenoid valve can accurately set the flow rate of the fluid in the leak passage to a suitable amount. Accordingly, the fuel cell solenoid valve can discharge a certain amount of fluid in a state where the valve portion is seated on the valve seat.

  Further, it is desirable that the leak passage is provided perpendicular to the communication passage.

  In such a fuel cell solenoid valve, since the leak passage is provided near the outlet of the communication passage and perpendicular to the communication passage, the fluid flowing to the outlet port becomes a turbulent flow, and the turbulent fluid becomes the dilution fluid. Is supplied to the diluter, the agitation by the diluting fluid occurs in the diluter, and the dilution is more preferably performed. In the fuel cell solenoid valve, when the leak passage is provided in a straight line with the outlet port, the fluid discharged through the communication passage merges with the fluid discharged through the leak passage in the vicinity of the outlet of the communication passage. As a result, the fluid discharged through the communication path does not collide with the inner wall of the outlet port, and the pressure loss can be reduced. Furthermore, the workability of the leak passage can be improved by arranging the leak passage horizontally and making the orifice a separate structure.

  ADVANTAGE OF THE INVENTION According to this invention, the solenoid valve for fuel cells which can adjust the flow volume of fluids, such as air, can be provided.

It is a block block diagram of a fuel cell system provided with the solenoid valve for fuel cells which concerns on embodiment of this invention. It is sectional drawing for demonstrating the structure of the solenoid valve for fuel cells which concerns on embodiment of this invention. It is principal part sectional drawing for demonstrating operation | movement of the solenoid valve for fuel cells which concerns on embodiment of this invention, (a) is a figure which shows a valve closing state, (b) is a figure which shows a valve opening state.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a fuel cell system including a fuel cell solenoid valve 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, a fuel cell system 200 includes a fuel cell 211, a hydrogen tank 212 that is filled with high-pressure hydrogen gas and supplies hydrogen gas as fuel gas to the fuel cell 211, An air compressor 213 that supplies compressed air containing an oxidant gas (oxygen) to the fuel cell 211 and a hydrogen gas discharged from the fuel cell 211 are supplied from the air discharged from the fuel cell 211 and the air compressor 213. And a diluter 214 for diluting with air.

  The fuel cell 211 is, for example, a solid polymer electrolyte fuel cell (PEFC), and is mounted on a vehicle such as a fuel cell automobile (not shown). This fuel cell 211 has a stack body (not shown) formed by laminating a plurality of single cells, an anode supplied with hydrogen gas as a fuel gas, and an oxidant gas such as oxygen And a cathode to which air containing air is supplied.

  A hydrogen supply passage 201 is provided between the hydrogen tank 212 and the fuel cell 211, and an ejector 215 is disposed in the hydrogen supply passage 201. The ejector 215 is connected to a circulation passage 202 that feeds back unreacted hydrogen (hereinafter referred to as hydrogen offgas), which is fuel offgas discharged from the fuel cell 211, so that the hydrogen offgas fed back from the fuel cell 211 is fed back. This is a device that is mixed with hydrogen gas supplied from the hydrogen tank 212 and supplied to the anode of the fuel cell 211.

  An air supply passage 203 is provided between the air compressor 213 and the fuel cell 211, and a humidifier 216 that humidifies the air supplied from the air compressor 213 is disposed in the air supply passage 203. Yes. The air humidified by the humidifier 216 is supplied to the cathode of the fuel cell 211 via the air supply passage 203.

  A hydrogen gas discharge passage 204 is provided between the fuel cell 211 and the diluter 214 to send the hydrogen off-gas discharged from the anode of the fuel cell 211 to the diluter 214. In the hydrogen gas discharge passage 204, a purge valve (not shown) is provided on the downstream side of the branch with the circulation passage 202, and the hydrogen off gas flows by opening and closing the hydrogen gas discharge passage 204 by the purge valve. It is possible to switch the direction.

  An air discharge passage 205 is provided between the fuel cell 211 and the diluter 214 to send air discharged from the cathode of the fuel cell 211 to the diluter 214. An air supply passage 206 is provided between the air compressor 213 and the diluter 214 to supply air from the air compressor 213 to the diluter 214 as a diluting fluid. In the air supply passage 206, a fuel cell electromagnetic valve 1 that partially opens and closes the air supply passage 206 is provided.

  Next, an embodiment of the fuel cell solenoid valve 1 incorporated in the fuel cell system 200 will be described in detail with reference to the drawings. FIG. 2 is a cross-sectional view for explaining the structure of the solenoid valve for a fuel cell according to the embodiment of the present invention. FIG. 3 is a cross-sectional view of a main part for explaining the operation of the solenoid valve for a fuel cell according to the embodiment of the present invention, where (a) shows a valve closing state and (b) shows a valve opening state. FIG.

  The electromagnetic valve 1 for a fuel cell is a valve for supplying the air compressed by the air compressor 213 to the diluter 214. As shown in FIG. 2, the valve body 10, the guide body 20, and the color guide 30 are provided. A resin sealing body 40, a housing 50, a solenoid portion 60, a valve body 70 having an elastic member 80, and a valve seat member 90.

<Valve body 10>
As shown in FIG. 2, the valve body 10 includes an introduction port 10a through which air compressed by an air compressor 213 (see FIG. 1) is introduced, and a lead-out port 10b through which the introduced air is led out. Have The valve body 10 is made of a metal material (for example, stainless steel), and a valve body 70 is provided in the valve body 10 so as to be freely displaceable (here, displaceable in the vertical direction in the figure).

Inlet port 10a is a passage air compressed by the air compressor 213 is supplied, the communication chamber 10c formed inside the valve body 10, and communicates with the side wall 10c ₁ of the communication chamber 10c. In this embodiment, inlet port 10a is a passage air is supplied from above, a first passage 10a ₁ which extends in the longitudinal direction, the first downstream end of the passage 10a ₁ and the communication chamber And a second passage 10a ₂ extending obliquely upward so as to communicate with 10c.

Outlet port 10b is a passage air is derived communicating chamber 10c, via the communication path R1 of the communication chamber 10c bottom wall 10c seat press-fitted into the hole portion 10d formed in the _two members 90 of the , Communicated with the communication chamber 10c. The upper surface of the valve seat member 90 where the communication path R1 opens functions as a valve seat surface (valve seat) 91a on which a seat portion 81 of the valve body 70 described later is seated and separated. In the present embodiment, the communication path R1 is a path extending in the vertical direction, and the outlet port 10b is a path extending in the horizontal direction.

The valve body 10 further includes a leak passage 10e that directly connects the introduction port 10a and the outlet port 10b. The leak passage 10e is formed separately from the communication chamber 10c and the communication passage R1, and is opened so that the introduction port 10a and the discharge port 10b are always in communication. Further, the leak passage 10e is an orifice 10e ₁ are separate structure is provided, the amount of air flowing through the leak passage 10e is set to be constant. In this embodiment, leak passage 10e has a outlet port 10b and the downstream end of the first passage 10a ₁ so as to communicate, and extends in the transverse direction at the same height as the outlet port 10b, The leak passage 10e and the outlet port 10b constitute a straight passage.

<Guide body 20 and color guide 30>
The guide body 20 is connected to the upper part of the valve body 10, and a movable core 64, which will be described later, is provided inside the guide body 20 so as to be displaceable along the axial direction. The guide body 20 is formed in a cylindrical shape, and a cylindrical portion 21 in which a movable core 64 is provided so as to be displaceable. The guide body 20 protrudes radially outward from the cylindrical portion 21, and is connected to the upper portion of the valve body 10 via a connecting bolt B1. And a flange portion 22 to be connected. Note that the connecting bolt B1 is inserted into the flange portion 22 through a plurality of holes (not shown) formed at predetermined intervals in the circumferential direction, and the connecting bolt B1 is screwed into the upper surface of the valve body 10. By joining, the guide body 20 and the valve body 10 are integrally connected.

  A lower portion of the cylindrical portion 21 is inserted into the valve body 10, and a seal member S <b> 1 is mounted between the valve body 10 and a corner portion where the cylindrical portion 21 and the flange portion 22 are joined. Thereby, the airtightness inside the valve body 10 in which the cylindrical part 21 is inserted is reliably maintained.

  Also, inside the cylindrical portion 21, one end portion side of a color guide 30 formed in a cylindrical shape from substantially the same diameter is inserted, and a collar portion 31 formed at one end portion of the color guide 30 is a lower portion of the cylindrical portion 21. It is attached to. The color guide 30 has a guide function for guiding a movable core 64, which will be described later, along the vertical direction. The collar guide 30 is formed in a thin cylindrical shape from a metal material, and the upper surface of the flange portion 31 protruding radially outward is formed. In addition, it is firmly fixed by laser welding or the like in contact with the lower surface of the cylindrical portion 21. Thereby, the inner peripheral surface of the cylindrical portion 21 is covered with the color guide 30.

  Further, the collar portion 31 of the color guide 30 has a stopper function for restricting displacement when the valve body 70 is displaced toward the guide body 20 side. The lower surface of the flange 31 (the surface facing the elastic member 80) has a planar shape. The surface of the color guide 30 is covered with a fluorine coating film (not shown).

  The other end portion of the color guide 30 extends upward by a predetermined length so as to protrude from the cylindrical portion 21 of the guide body 20, and is inserted into a bobbin 62 (described later) of the solenoid portion 60. Yes.

<Resin encapsulant 40>
The resin sealing body 40 is formed by molding a coil winding body including a coil 61 and a bobbin 62, which will be described later, with a resin material, and is connected to the upper portion of the guide body 20. A connector portion 41 connected to a power source (not shown) for supplying current to the solenoid portion 60 is provided on the side surface of the resin sealing body 40, and the connector portion 41 has one end portion therein. A terminal (not shown) made of a metal material is provided so as to be exposed. The terminal is connected to the coil 61 of the solenoid unit 60 through the inside of the resin sealing body 40. The terminal is connected to the power supply via a lead wire (not shown).

  On the upper surface of the resin sealing body 40, an overhanging portion 42 that projects inward in the radial direction is formed, and an O-ring A <b> 1 is mounted via an annular groove formed on the upper surface of the overhanging portion 42. The O-ring A <b> 1 is sandwiched between the resin sealing body 40 and a housing 50 described later, whereby the airtightness between the resin sealing body 40 and the housing 50 is maintained.

<Housing 50>
The housing 50 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 cover a part of the resin sealing body 40 and the guide body 20 from above. A hole 51 is formed substantially at the upper part of the housing 50, and a screw part 63 a provided on the upper surface of the fixed core 63 described later is inserted through the hole 51. Thus, by forming the housing 50 with a substantially U-shaped cross section, the weight can be reduced and the amount of material used can be reduced, so that the cost can be reduced. .

  The housing 50 is formed with an opening 52 that is cut out in a substantially rectangular shape along the axial direction, and the connector portion 41 protrudes outside the housing 50 through the opening 52.

<Solenoid unit 60>
As shown in FIG. 2, the solenoid unit 60 is disposed inside the resin sealing body 40, and has a bobbin 62 around which a coil 61 is wound on the outer peripheral surface, and a cap nut C <b> 1 on the top of the resin sealing body 40. A fixed core 63 that is integrally connected to each other, a movable core 64 that is opposed to the fixed core 63 and that can be displaced along the axial direction in the bobbin 62, and between the fixed core 63 and the movable core 64. And a return spring 65 interposed therebetween.

  The bobbin 62 is provided so as to come into contact with the inner peripheral surface of the resin sealing body 40, and a first diameter-expanded part 62a and a second diameter-expanded part 62b whose diameters are increased radially outward at the upper end and the lower end. Are formed respectively. The bobbin 62 is molded inside the resin sealing body 40 in a state where the coil 61 is wound between the first enlarged diameter portion 62a and the second enlarged diameter portion 62b.

  Further, an insertion hole 62c penetrating along the axial direction is formed in a substantially central portion of the bobbin 62, and the color guide 30 fixed to the cylindrical portion 21 of the guide body 20 is inserted into the insertion hole 62c. In addition, a fixed core 63 formed in a columnar shape by a metal material made of a magnetic material is inserted into the upper portion of the insertion hole 62c. The inner diameter of the insertion hole 62c is formed to be substantially equal to the outer diameter of the color guide 30.

  The fixed core 63 has a threaded portion 63a formed in an upper portion thereof inserted through the hole 51 of the housing 50, and then a washer W1 is inserted thereinto and the cap nut C1 is screwed. Thereby, the fixed core 63 is integrally connected to the resin sealing body 40.

  Further, a reduced diameter portion 63b is formed on the outer peripheral surface of the fixed core 63 on the movable core 64 side, and the other end portion of the color guide 30 fixed to the guide body 20 is formed in the reduced diameter portion 63b. Is installed. Specifically, the color guide 30 is firmly fixed to the fixed core 63 by being welded to the fixed core 63 by laser welding.

  As a result, the three parts of the fixed core 63, the guide body 20 and the color guide 30 can be integrated by laser welding or the like, so that the fixed core 63, the guide body 20 and the color guide 30 integrated in advance are used as other parts. Assembling becomes possible, and it is possible to reduce the number of assembling steps and improve workability when assembling.

  Furthermore, since the reduced diameter portion 63b of the fixed core 63 is formed by reducing the diameter inward in the radial direction by the thickness of the color guide 30, the outer peripheral surface of the color guide 30 attached to the reduced diameter portion 63b is It is substantially flush with the outer peripheral surface of the fixed core 63. A movable core 64 is inserted below the fixed core 63 via the color guide 30.

  On the lower surface of the fixed core 63, a convex portion 63c that protrudes toward the movable core 64 is formed at a substantially central portion thereof, and one end portion of a return spring 65 interposed between the movable core 64 and the fixed core 63 is engaged. It is worn.

  The movable core 64 is formed in a cylindrical shape from a metal material made of a magnetic material, and a spring receiving hole 64a that is recessed at a predetermined depth is formed at one end on the fixed core 63 side. A return spring 65 is interposed between the spring receiving hole 64a and the convex portion 63c of the fixed core 63 facing the spring receiving hole 64a. The elastic force of the return spring 65 fixes the movable core 64. It is biased in a direction away from the core 63.

  A plurality of groove portions 64 b are formed along the axial direction on the outer peripheral surface of the movable core 64, and these groove portions 64 b are formed at predetermined intervals along the circumferential direction of the movable core 63. . The groove 64b is formed, for example, so as to have a substantially V-shaped cross section.

  Thus, by forming the groove portion 64b along the outer peripheral surface of the movable core 64, when the movable core 64 is displaced along the axial direction, the air existing between the movable core 64 and the fixed core 63 is removed. The air can be vented to the valve body 70 side through the groove 64b. Therefore, displacement resistance of the movable core 64 is not generated by the air between the movable core 64 and the fixed core 63, and the movable core 64 can be displaced smoothly.

  On the other hand, inside the movable core 64, there are formed a small diameter hole 64c to which the valve body 70 is connected on the other end side, and a large diameter hole 64d formed with a diameter larger than that of the small diameter hole 64c. In addition, the spring receiving hole 64a in which the return spring 65 is interposed communicates with the small diameter hole 64c and the large diameter hole 64d.

<Valve 70 and valve seat member 90>
The valve body 70 is formed on a shaft portion (shaft portion) 71 connected to the movable core 64 and a lower portion of the shaft portion 71, and is provided on the valve seat surface 91 a of the valve seat member 91 so as to be seated and separated. Part 72.

  The shaft portion 71 is made of a metal material, and has a first shaft 71a press-fitted into the small-diameter hole 64c of the movable core 64, and a large-diameter hole 64d of the movable core 64 having a diameter larger than that of the first shaft 71a. And a third shaft 71c that is formed with a diameter larger than that of the second shaft 71b and is engaged with the lower end surface of the movable core 64. Thus, since the 1st axis | shaft 71a of the shaft part 71 is press-fit with respect to the small diameter hole 64c of the movable core 64, the valve body 70 and the movable core 64 will be in the state connected firmly.

  The valve portion 72 is disposed in the communication chamber 10c of the valve body 10, and is formed at a lower portion of the third shaft 71c of the shaft portion 71 and has a diameter-expanded portion (valve base portion) 72a having a diameter larger than that of the third shaft 71c. , And an elastic member (elastic body portion) 80 made of an elastic material (for example, fluororubber) that is sheathed so as to surround the enlarged diameter portion 72a.

  The enlarged diameter portion 72a is formed in a substantially disk shape, and the outer peripheral diameter thereof is smaller than the inner peripheral diameter of the communication chamber 10c. In addition, a plurality of communication holes 72b penetrating between the upper and lower surfaces are formed in the enlarged diameter portion 72a at a predetermined interval.

  On the other hand, the elastic member 80 is formed so as to cover the entire enlarged diameter portion 72a by placing the enlarged diameter portion 72a inside a molding die (not shown) and filling the molding die with an elastic material and solidifying it. (Including filling of the communicating holes 72b of elastic material).

  The elastic member 80 is formed on the outer peripheral surface and the lower surface side of the enlarged diameter portion 72a so as to have a substantially constant thickness. Since the elastic member 80 is filled in the plurality of communication holes 72b that communicate the upper surface and the lower surface of the enlarged diameter portion 72a, the elastic member 80 is prevented from falling off the enlarged diameter portion 72a. Thus, since the valve body 70 has a structure in which the enlarged diameter portion 72a is provided at the center of the elastic member 80, the strength of the elastic member 80 made of an elastic material can be improved.

  In addition, a seating portion (annular projection) 81 projecting in an annular shape is formed at a substantially central portion of the lower portion of the elastic member 80, and the diameter of the seating portion 81 is the communication path R1 opened to the valve seat member 90. It is formed larger than the inner diameter. That is, the seating portion 81 abuts on the valve seat surface 91a of the valve seat member 90 and covers the outer peripheral portion of the communication passage R1 that opens to the valve seat surface 91a, so that the communication chamber 10c and the outlet port 10b in the communication passage R1 are connected. The communication state is cut off.

  On the inner peripheral side of the seating portion 81 of the elastic member 80, the bottom surface of the enlarged diameter portion 72a is exposed without being covered by the elastic member 80.

  The elastic member 80 includes, on the upper surface side facing the flange 31, a contact portion that can contact the flange 31, and a recess that is separated from the flange when the contact portion 82 is in contact with the flange 31. And comprising. In the elastic member 80, a plurality of recesses are provided at equal intervals in the circumferential direction with respect to the axial center of the elastic member 80, and extend radially (for example, a total of four every 90 degrees).

As shown in FIG. 2, the valve seat member 90 is a metal (for example, SUS) member that is press-fitted into the hole 10 d of the valve body 10, and includes a cylindrical portion 91 and a flange portion 92. . The cylindrical portion 91 includes a communication passage R1 therein, and an upper surface thereof serves as a valve seat surface 91a. The flange portion 92 is provided in the vicinity of the upper end portion of the cylindrical portion 91, and contacts the bottom wall 10 c ₂ of the valve body 10 in a state where the valve seat member 90 is press-fitted into the hole portion 10 d of the valve body 10. The surface of the valve seat member 90 is covered with a fluorine coating film (not shown).

  The fuel cell solenoid valve 1 according to the embodiment of the present invention is basically configured as described above. Next, the operation and effects thereof will be described.

  As shown in FIGS. 1 and 2, in the fuel cell system 200, the fuel cell solenoid valve 1 is provided in the air supply path 206, and the introduction port 10a of the fuel cell solenoid valve 1 is connected via a pipe P1. And connected to the upstream side of the air supply path 206. The lead-out port 10b is connected to the downstream side of the air supply path 206 through the pipe P2.

  FIG. 3A is a partially enlarged view of the fuel cell solenoid valve 1, in a non-excited state in which no current is supplied to the coil 61 via the connector portion 41, and the seat portion 81 of the valve body 70. Shows an off state (first state) in which the communication between the inlet port 10a and the outlet port 10b in the communication path R1 is blocked by sitting on the valve seat surface 91a formed on the upper surface of the valve seat member 90. Yes. Even in such an off state, the air introduced from the introduction port 10a can flow to the outlet port 10b via the leak passage 10e.

  In such an off state, the coil 61 is energized by energizing the coil 61 through the terminal of the connector portion 41 by energizing a power source (not shown) by drive control by an ECU (Electronic Control Unit, not shown). The magnetic flux is generated by exciting the magnetic flux from the coil 61 toward the movable core 64 and returning to the coil 61 under the exciting action.

  Then, as shown in FIG. 3B, the movable core 64 is displaced upward along the axial direction against the elastic force of the return spring 65, and the seating portion 81 of the valve body 70 is moved to the valve seat member 90. It is separated from the valve seat surface 91a.

  Then, the upper surface of the elastic member 80 attached to the enlarged diameter portion 72 a of the valve body 70 comes into contact with the collar portion 31 of the color guide 30 and becomes a displacement end position. At that time, the impact when the valve body 70 is displaced to the displacement end position is reduced by the elastic member 80 made of an elastic material, and the contact noise is reduced. As a result, the fuel cell solenoid valve 1 is switched from the off state to the on state (second state). In such an on state, the air introduced from the introduction port 10a can flow from both the leak passage 10e and the route via the communication chamber 10c and the communication passage R1 to the outlet port 10b.

  Thus, in the second state, which is the valve open state, the air introduced from the introduction port 10a passes through both the leak passage 10e and the route via the communication chamber 10c and the communication passage R1 through the outlet port 10b. Since the air is discharged to the outside, more air can be discharged, that is, supplied to the diluter 214 as compared with the first state in which the air is discharged only through the leak passage 10e. is there.

  Further, when it is desired to suppress the amount of air discharged in such an on state, the seating portion 81 of the valve body 70 is seated again on the valve seat surface 91a of the valve seat member 90, and the introduction port 10a in the communication path R1. And the communication between the outlet port 10b are cut off.

  In this case, by stopping the supply of current supplied to the coil 61 from a power source (not shown), the coil 61 is brought into a non-excited state, and the upward displacement force applied to the movable core 64 is extinguished. Is done.

  Therefore, the movable core 64 is pressed downward by the elastic force of the return spring 65, and the upper surface of the elastic member 80 in the valve body 70 is separated from the lower surface of the flange portion 31. At this time, the upper surface of the elastic member 80 is in contact with the lower surface of the flange portion 31 between the upper surface of the elastic member 80 and the lower surface of the flange portion 31 by a recess formed on the upper surface of the elastic member 80. A non-contact portion (space) is provided in advance. Therefore, the elastic member 80 of the valve body 70 and the flange 31 are prevented from sticking, and the elastic member 80 can be reliably and easily separated from the flange 31 when the valve body 70 is displaced downward. . In addition, since the concave portion is provided on the movable side valve portion 72 side instead of the fixed side flange portion 31 and the movable side is reduced in weight by the concave portion, the operation of the valve body 72 becomes smoother, and the elastic member 80 is connected to the flange portion. It can be reliably and easily separated from 31.

  Then, the seating portion 81 of the valve body 70 is seated on the valve seat surface 91a of the valve seat member 90, and the outer peripheral portion of the communication passage R1 is closed by the annular seating portion 81, whereby the introduction through the communication passage R1 is performed. Air flow from the port 10a to the outlet port 10b is blocked. As a result, air is discharged from the fuel cell solenoid valve 1 to the diluter 214 side only through the leak passage 10e, and the amount of air discharged is reduced.

In addition, since the fuel cell solenoid valve 1 is provided with the orifice 10e _{1 in} the leak passage 10e, the flow rate of air in the leak passage 10e can be accurately set to a suitable amount. Therefore, the fuel cell electromagnetic valve 1 can discharge a certain amount of air in a state where the valve portion 72 is seated on the valve seat surface 91a.

In this fuel cell solenoid valve 1, since the leak passage 10e is provided in the vicinity of the outlet of the communication passage R1 and perpendicular to the communication passage R1, the air flowing to the outlet port 10b becomes turbulent and turbulent. Since the air is supplied to the diluter 214 as dilution air, the agitation by the dilution air occurs in the diluter 214, and the hydrogen off-gas discharged from the anode of the fuel cell 211 and supplied to the diluter 214 is more suitably used. Can be diluted. Further, in the fuel cell solenoid valve 1, since the leak passage 10e is provided in a straight line with the outlet port 10b, the air discharged through the communication passage R1 and the air discharged through the leak passage 10e are connected to the communication passage R1. Since they merge in the vicinity of the outlet and flow toward the outlet port 10b, the air discharged through the communication path R1 is less likely to hit the inner wall of the outlet port 10b, and the pressure loss can be reduced. Furthermore, the workability of the leak passage 10e can be improved by arranging the leak passage 10e horizontally and making the orifice 10e ₁ a separate structure.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and design changes can be made as appropriate without departing from the spirit of the present invention. For example, the fuel cell solenoid valve 1 of the present invention is applicable not only to a valve for discharging air but also to a valve for discharging a fluid (including a pressure fluid) such as water and hydrogen.

DESCRIPTION OF SYMBOLS ₁ Solenoid valve for fuel cells 10e ₁ Orifice 10a Inlet port 72 Valve part 10b Outlet port 91a Valve seat surface (valve seat)
10c Communication room R1 Communication path 10e Leak path 214 Diluter

Claims (3)

An introduction port through which fluid is introduced;
An outlet port from which the fluid is derived;
A communication chamber provided between the introduction port and the outlet port;
A communication path for communicating the communication chamber and the outlet port;
A valve seat provided in the communication chamber side opening of the communication path;
A valve portion that is housed in the communication chamber and that can be separated from and seated on the valve seat;
With
The communication path is opened and closed by the seating / seating of the valve portion with respect to the valve seat, and the fluid valve derived from the outlet port is supplied to the diluter as a diluent fluid,
A leak passage for directly communicating the introduction port and the outlet port is provided separately from the communication chamber and the communication passage,
The fuel cell electromagnetic valve, wherein the leak passage is opened so that the introduction port and the outlet port are always in communication. The electromagnetic valve for a fuel cell according to claim 1, wherein the leak passage includes an orifice through which the fluid flows. The solenoid valve for a fuel cell according to claim 1 or 2, wherein the leak passage is provided perpendicular to the communication passage.

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