JP2009301846A - Electromagnetic valve for fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic valve for a fuel cell capable of preventing pasting by a constitution easy to manufacture, and reducing abutting noise. <P>SOLUTION: The electromagnetic valve 1 for the fuel cell is equipped with a valve seat face 10c, a valve part 72 installed capable of seating to and leaving from the valve seat face 10c, and a metallic flange part 31 to regulate movement of the valve part 72 by abutting on the valve part 72 when the valve part 72 leaves from the valve seat face 10c. The valve part 72 is equipped with an enlarged diameter part 72a, and an elastic member 80 mounted on the outer periphery of the enlarged diameter part 72a and opposed to the flange part 31, and a face opposite to the flange part 31 of the elastic member 80 is equipped with an abutting part 82 capable of abutting to the flange part 31, and a recess part 83 separated from the flange part 31 in a state that the abutting part 82 is abutted to the flange part 31. <P>COPYRIGHT: (C)2010,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

  In such a fuel cell solenoid valve, the amount of movement of the valve body is regulated by an elastic member attached to the outer periphery of the valve body in contact with the collar portion of the color guide in the open state. Here, in order to prevent an elastic member from sticking to a collar part, the several recessed part is provided in the metal collar part. However, in the configuration in which the concave portion is provided in the metal collar, labor is required for processing, and therefore a fuel cell solenoid valve having a configuration that is easier to manufacture has been desired.

  The present invention has been made in view of the above-described demand, and an object thereof is to provide a fuel cell electromagnetic valve capable of preventing sticking and reducing contact noise with an easily manufactured structure. To do.

  In order to achieve the above object, the present invention provides a valve seat, a valve portion that can be seated / separated with respect to the valve seat, and when the valve portion is separated from the valve seat, A metal movement restricting portion that restricts movement of the valve portion by contacting the valve portion, wherein the valve portion is provided on a valve base and an outer periphery of the valve base. An elastic body portion that is mounted and faces the movement restriction portion, and a surface of the elastic body portion that faces the movement restriction portion is a contact portion that can be brought into contact with the movement restriction portion. And a concave portion that is spaced apart from the movement restricting portion in a state where the abutting portion is in contact with the movement restricting portion.

  In such a fuel cell solenoid valve, since the elastic member has a plurality of recesses, the elastic member is prevented from being attached to the movement restricting portion when the elastic member comes into contact with the movement restricting portion. The In addition, since the solenoid valve for a fuel cell is provided with a recess on the surface of the elastic member that faces the movement restricting portion, the contact area between the elastic member and the movement restricting portion can be reduced. Can be reduced. Furthermore, since the solenoid valve for a fuel cell has a recess on the surface facing the movement restricting portion of the elastic member, the contact surface with the movement restricting portion of the elastic member is soft and easily deformed elastically. The contact noise can be further reduced. Furthermore, the fuel cell solenoid valve can be easily manufactured because it is provided with a recess in an elastic member that can be formed from a resin or the like rather than a metal movement restricting portion.

  In addition, a chamfered portion having an R shape is provided at the end of the movement restricting portion on the side facing the elastic body portion, and at least on the side of the movement restricting portion facing the elastic body portion, It is desirable that a coating film is formed.

  Such a fuel cell solenoid valve has a chamfered portion at the end of the movement restricting portion on the side facing the elastic body portion, so that a coating film (for example, a fluorine coating film) is easily applied to the elastic body portion. The coating film can be prevented from being peeled off due to the contact.

  The fuel cell solenoid valve is provided with a plurality of the recesses extending radially and at equal intervals in the circumferential direction with respect to the axial center of the elastic body portion. However, even if the inner diameter side end portion is provided inside the inner diameter side end portion of the movement restricting portion, and the outer diameter side end portion is open to the outer peripheral surface of the elastic body portion. The abutting portions may extend radially, and a plurality of the abutting portions are provided at equal intervals in the circumferential direction with respect to the axial center of the elastic body portion. The side end portion may be formed so as to rise more on the outer diameter side than the inner diameter side end portion of the elastic body portion.

  According to the present invention, it is possible to provide a fuel cell solenoid valve capable of preventing sticking with a structure that can be easily manufactured and reducing contact noise.

  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 oxidant gas (oxygen) to the fuel cell 211, and a catch tank 214 that separates hydrogen gas containing moisture discharged from the fuel cell 211 into hydrogen gas and water. And a diluter 215 for diluting the separated hydrogen gas with the air discharged from the fuel cell 211.

  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 216 is disposed in the hydrogen supply passage 201. The ejector 216 is connected to a circulation passage 202 that feeds back unreacted hydrogen (hereinafter referred to as hydrogen offgas), which is a fuel offgas discharged from the fuel cell 211, so that the hydrogen offgas fed back from the fuel cell 211 is supplied to the ejector 216. 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 217 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 217 is supplied to the cathode of the fuel cell 211 through the air supply passage 203.

  Between the catch tank 214 and the diluter 215, a separated hydrogen gas discharge passage 204 for hydrogen gas and a separated water discharge passage 205 for water are provided. In the water discharge passage 205, a fuel cell solenoid valve 1 for opening and closing the water discharge passage 205 is provided. 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 gas flows by opening and closing the hydrogen gas discharge passage 204 by the purge valve. It is possible to switch the direction.

<First embodiment>
Next, a first 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 fuel cell solenoid valve according to the first embodiment of the present invention. FIG. 3 is a view for explaining the elastic member according to the first embodiment of the present invention, in which (a) is a perspective view and (b) is a plan view. FIG. 4 is a cross-sectional view of a main part for explaining the operation of the solenoid valve for a fuel cell according to the first embodiment of the present invention, where (a) is a diagram showing a closed state, and (b) is a valve opening. The figure which shows a state, (c) is a figure which shows a collar part.

  This solenoid valve 1 for a fuel cell is a discharge valve for discharging generated water separated by the catch tank 214, and as shown in FIG. 2, a valve body 10, a guide body 20, a color guide 30, The resin sealing body 40, the housing 50, the solenoid part 60, and the valve body 70 are provided.

<Valve body 10>
As shown in FIG. 2, the valve body 10 has an introduction port 10a into which generated water (hereinafter referred to as water) separated by a catch tank 214 (see FIG. 1) is introduced, and the introduced water is led out to the outside. A derivation port 10b. The valve body 10 is formed of a metal material (for example, stainless steel), and a main body portion 11 in which a valve body 70 is movably provided, and is protruded downward from the main body portion 11. The protrusion part 12 and the attachment flange 13 formed in the upper part of the main-body part 11 by expanding in diameter outward are provided. The valve body 10 is attached to a holding block 110 formed with a passage through which water flows.

  Here, the holding block 110 to which the valve body 10 is fixed will be briefly described. The holding block 110 includes a first insertion hole 111 into which the main body portion 11 of the valve body 10 is inserted, and a second insertion hole 112 formed at a lower portion of the first insertion hole 111 with a diameter smaller than that of the first insertion hole 111. And an introduction passage 113 that is formed so as to extend substantially in the horizontal direction, communicates with the introduction passage 113, and is formed in an annular shape so as to face the first insertion hole 111. And a lead-out passage 115 formed so as to communicate with the second insertion hole 112 and through which the water led out from the lead-out port 10b of the projecting portion 12 flows.

  The valve body 10 is fixed to the upper surface of the holding block 110 with the fixing bolt B1 via the mounting flange 13. Note that the fuel cell solenoid valve 1 is not limited to being mounted on the holding block 110.

  Here, the brief description of the holding block 110 is finished, and the description returns to the valve body 10. The main body 11 of the valve body 10 is formed in a bottomed cylindrical shape, and includes a side wall 11a formed substantially parallel to the axis of the main body 11 and a bottom wall 11b substantially orthogonal to the axis of the main body 11. A tapered surface 11c that is inclined at a predetermined angle along the peripheral surface of the outer peripheral surface is formed at the joint portion. The tapered surface 11c is formed to be inclined at about 45 degrees with respect to the side wall 11a and the bottom wall 11b, and the introduction port 10a that penetrates the tapered surface 11c substantially perpendicularly to the tapered surface 11c. Is formed.

  The introduction port 10a is formed in plural (for example, four places at intervals of 90 degrees) at regular intervals along the circumferential direction of the main body 11, and communicates with a communication chamber 11d formed inside the main body 11. ing. The introduction port 10 a is formed at a position facing the annular introduction chamber 114 formed inside the holding block 110 when the valve body 10 is mounted on the holding block 110.

  An O-ring A1 is attached to the side wall 11a of the main body 11 via an annular groove formed on the outer peripheral side. Thereby, when the main body 11 is inserted into the first insertion hole 111 of the holding block 110, the O-ring A <b> 1 is sandwiched between the inner peripheral surface of the first insertion hole 111 and the outer peripheral surface of the main body 11. Therefore, airtightness between the inner peripheral surface of the holding block 110 and the outer peripheral surface of the main body 11 is maintained.

  The protruding portion 12 protrudes downward from a substantially central portion of the bottom wall 11b of the main body portion 11 by a predetermined length, and has an outer peripheral diameter that is smaller than the outer peripheral diameter of the side wall 11a of the main body portion 11. ing. The protruding portion 12 is formed so as to be coaxial with the main body portion 11, and when the valve body 10 is attached to the holding block 110, a second diameter formed smaller than the first insertion hole 111. It is inserted into the insertion hole 112.

  A single outlet port 10b is formed at the lower end of the projecting portion 12 so as to open downward and lead out the water introduced into the communication chamber 11d. The outlet port 10b is formed from the outlet port 10b. The communication chamber 11d communicates with the communication chamber 11d through a communication passage 12a formed to have a small diameter. The lead-out port 10b and the communication path 12a are formed so as to be coaxial with the axis of the main body 11. The bottom wall 11b of the main body portion 11 where the communication passage 12a opens functions as a valve seat surface (valve seat) 10c on which a seat portion 81 of a valve body 70 described later is seated and separated.

  The lead-out port 10b communicates with the lead-out passage 115 of the holding block 110 formed at a position facing the lead-out port 10b. That is, the water led out from the lead-out port 10b is discharged to the outside through the lead-out passage 115.

  The cross-sectional area of the lead-out port 10b is set to be smaller than the total cross-sectional area obtained by adding the cross-sectional areas of the plurality of introduction ports 10a formed. Thereby, since the total flow rate of the water introduced from the plurality of introduction ports 10a can be made larger than the flow rate derived from the derivation port 10b, the flow rate derived from the derivation port 10b does not become insufficient. Can be reliably discharged from the outlet port 10b.

  On the other hand, an O-ring A2 is mounted on the outer peripheral surface of the protruding portion 12 via an annular groove, and the O-ring A2 is sandwiched between the second insertion hole 112 of the holding block 110 and the outer peripheral surface of the protruding portion 12. By doing so, the airtightness between the inner peripheral surface of the holding block 110 and the outer peripheral surface of the protruding portion 12 is maintained.

  The mounting flange 13 is formed in a substantially rhombus shape in plan view with a predetermined thickness, and a set of hole portions 13a are formed at a predetermined distance from the main body portion 11 in the radially outward direction. The fixing bolt B1 is inserted through the hole 13a, and the mounting flange 13 is fixed to the upper surface of the holding block 110 by the fixing bolt B1.

<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 a connection bolt (not shown) on the upper portion of the valve body 10. ), And a flange portion 22 connected via Note that a connecting bolt 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 is screwed onto the upper surface of the valve body 10. Thus, the guide body 20 and the valve body 10 are connected.

  A lower portion of the cylindrical portion 21 is inserted into the body portion 11 of the valve body 10, and a seal member S <b> 1 is mounted between the corner portion where the cylindrical portion 21 and the flange portion 22 are joined and the body portion 11. ing. 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 vertically guiding a movable core 64, which will be described later. 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 a cylindrical portion. It is firmly fixed by laser welding or the like while being in contact with the lower surface of 21. Thereby, the inner peripheral surface of the cylindrical portion 21 is covered with the color guide 30. A plurality of hole portions 31a are arranged in the collar portion 31 along the circumferential direction, and water can move inside and outside the collar portion 31 through the hole portions 31a.

  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 portion 31 (the surface facing the elastic member 80) has a planar shape, and chamfered portions 31b and 31b having an R shape are formed on the inner and outer ends thereof. The surface of the color guide 30 is covered with a fluorine coating film 31c (see FIG. 4C).

  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).

  A projecting portion 42 projecting radially inward is formed on the upper surface of the resin sealing body 40, and an O-ring A3 is mounted via an annular groove formed on the upper surface of the projecting portion 42. Then, the O-ring A3 is sandwiched between the resin sealing body 40 and a housing 50 which will be 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 (not shown) cut out in a substantially rectangular shape along the axial direction, and the connector portion 41 projects outside the housing 50 through the opening. ing.

<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>
The valve body 70 is formed at a shaft portion (shaft portion) 71 connected to the movable core 64 and a lower portion of the shaft portion 71, and can be seated and separated on the valve seat surface 10 c of the main body portion 11 in the valve body 10. And a valve portion 72 provided.

  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 71a 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 11d 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 11d. 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.

  Further, a seat part (annular projecting part) 81 projecting in an annular shape is formed at a substantially central part of the lower part of the elastic member 80, and the diameter of the seat part 81 is open to the main body part 11 of the valve body 10. It is formed larger than the inner diameter of the communication path 12a. That is, the seating portion 81 abuts on the valve seat surface 10c of the main body portion 11 and covers the outer peripheral portion of the communication passage 12a that opens to the valve seat surface 10c, whereby the communication state between the communication chamber 11d and the outlet port 10b is blocked. The

  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.

  Furthermore, the outer peripheral diameter of the elastic member 80 is formed substantially equal to the inner peripheral diameter of the communication chamber 11d. That is, the elastic member 80 is disposed between the outer peripheral surface of the enlarged diameter portion 72a formed smaller than the inner peripheral diameter of the communication chamber 11d and the inner peripheral surface of the communication chamber 11d.

  As shown in FIG. 3, the elastic member 80 has an abutment portion 82 that can abut against the collar portion 31 on the upper surface side facing the collar portion 31, and a state where the abutment portion 82 abuts against the collar portion 31. And a recess 83 that is spaced from the collar. In this elastic member 80, a plurality of recesses 83 are provided so as to be equidistant in the circumferential direction with respect to the axial center of the elastic member 80, and extend radially (in this embodiment, every 90 degrees). 4).

  The inner diameter side end portion 83 a of the recess 83 is located inside the inner diameter side end portion of the flange portion 31, and the outer diameter side end portion 83 b of the recess 83 is open toward the outer peripheral surface of the elastic member 80. By adopting the concave portion 83 having such a shape, water, fluid, and the like in the concave portion 83 can move out of the concave portion 83 in a state where the abutting portion 82 of the elastic member 80 is in contact with the flange portion 31. The inner diameter side surface of the recess 83 is a tapered surface 83c.

  The fuel cell solenoid valve 1 according to the first 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 water discharge passage 205 via, for example, a holding block 110. The introduction port 10 a is connected to the upstream side of the water discharge passage 205 via the introduction passage 113 of the holding block 110. The lead-out port 10 b is connected to the downstream side of the water discharge passage 205 via the lead-out passage 115 of the holding block 110.

  FIG. 4A 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 seating portion 81 of the valve body 70. However, it shows an off state (valve closed state) in which the communication between the introduction port 10a and the outlet port 10b is blocked by sitting on the valve seat surface 10c formed on the bottom wall 11b of the main body portion 11.

  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. 4B, 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 It is separated from the valve seat surface 10c.

  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 (valve open state).

  Therefore, the water introduced into the communication chamber 11d from the introduction port 10a is discharged to the outside through the lead-out port 10b from the communication passage 12a through the clearance between the seating portion 81 of the valve body 70 and the valve seat surface 10c. Is done.

  In addition, when the discharge of water to the outside is stopped in such an ON state, the seating portion 81 of the valve body 70 is again seated on the valve seat surface 10c of the main body portion 11 to introduce the introduction port 10a and the outlet port 10b. It is in the off state where communication with is interrupted.

  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 the recess 83 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. . Moreover, since the recessed part 83 is provided in the movable side valve part 72 side instead of the fixed side collar part 31, and the movable side is reduced in weight by the recessed part 83, the operation of the valve body 72 becomes smoother, and the elastic member 80 is attached. It can be reliably and easily separated from the collar portion 31. Further, since the chamfered portion 31b is provided at the end portion of the flange portion 31 in addition to providing the recess portion 83 in the elastic member 80, the elastic member 80 of the valve body 70 and the flange portion 31 are more adhered by these synergistic effects. The elastic member 80 can be reliably and easily separated from the collar portion 31 when reliably preventing the valve body 70 from being displaced downward.

  Then, the seat portion 81 of the valve body 70 is seated on the valve seat surface 10c of the main body portion 11, and the outer peripheral portion of the communication passage 12a is closed by the annular seat portion 81, whereby the introduction port 10a passes through the communication chamber 11d. The flow of water to the outlet port 10b is blocked. As a result, the discharge of water from the fuel cell solenoid valve 1 to the diluter 215 side is stopped.

  In the fuel cell solenoid valve 1, since the elastic member 80 includes the plurality of recesses 83, the elastic member 80 is attached to the flange 31 when the elastic member 80 contacts the flange 31. Is prevented. Further, since the fuel cell solenoid valve 1 includes the recess 83 on the surface of the elastic member 80 facing the flange 31, the contact area between the elastic member 80 and the flange 31 can be reduced. Thereby, the contact noise can be reduced. Furthermore, since the fuel cell solenoid valve 1 includes the recess 83 on the surface of the elastic member 80 facing the flange 31, the contact surface of the elastic member 80 with the flange 31 is soft and easily elastically deformed. Thus, the contact noise can be further reduced. Furthermore, since the fuel cell solenoid valve 1 includes the recess 83 in the elastic member 80 that can be formed of resin, rubber or the like instead of the metal flange 31, it can be easily manufactured.

  In addition, since the fuel cell solenoid valve 1 includes the chamfered portion 31b having an R shape at the end of the flange portion 31 on the side facing the elastic member 80, the fluorine coating film 31c is easily applied. Compared with the conventional one in which the end portion has a square shape, peeling of the fluorine coating film 31c due to contact with the elastic member 80 can be suppressed.

<Second Embodiment>
Next, a fuel cell solenoid valve according to a second embodiment of the present invention will be described focusing on differences from the fuel cell solenoid valve according to the first embodiment. FIG. 5 is a view for explaining an elastic member according to the second embodiment of the present invention, in which (a) is a perspective view and (b) is a plan view.

  The solenoid valve for a fuel cell according to the second embodiment of the present invention includes an elastic member 180 instead of the elastic member 80. As shown in FIG. 5, the elastic member 180 has a contact portion 182 that can come into contact with the flange portion 31 on the upper surface side facing the flange portion 31, and a state in which the contact portion 182 is in contact with the flange portion 31. And a recess 183 spaced apart from the collar. In the elastic member 180, a plurality of contact portions 182 are provided at equal intervals in the circumferential direction with respect to the axial center of the elastic member 80, and extend radially (in this embodiment, every 90 degrees). 4 in total).

  The inner diameter side end 182 a of the contact portion 182 is located between the inner diameter side end portion and the outer diameter side end portion of the flange portion 31 or inside the inner diameter side end portion of the flange portion 31, and The outer diameter side end 182 b extends to the outer peripheral surface of the elastic member 180. The fuel cell solenoid valve according to the second embodiment can obtain the same effects as those of the fuel cell solenoid valve 1 according to the first embodiment by employing the contact portion 182 having such a shape. Furthermore, the impact when the contact portion 182 of the elastic member 180 contacts the flange portion 31 can be released not only to the outer diameter side end portion 182b of the contact portion 182 but also to the inner diameter side end portion 182a. . Further, the inner side surface and the pair of side surfaces of the contact portion 182 are a tapered surface 182c and tapered surfaces 182d and 182d, respectively. Moreover, the outer peripheral surface of the center part 184 which becomes the inner side of the contact part 182 and the recessed part 183 is the taper surface 184a. The tapered surface 182c and the tapered surface 184a constitute a V-shaped notch.

  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 solenoid valve for a fuel cell of the present invention can be applied not only to a valve for discharging generated water but also to a valve for discharging a fluid such as hydrogen (including a pressure fluid). Further, the number, shape, and the like of the contact portions 82 and 182 and the recesses 83 and 183 of the elastic members 80 and 180 are not limited to those illustrated.

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 1st embodiment of this invention. It is a figure for demonstrating the elastic member which concerns on 1st embodiment of this invention, (a) is a perspective view, (b) is a top view. It is principal part sectional drawing for demonstrating operation | movement of the solenoid valve for fuel cells which concerns on 1st embodiment of this invention, (a) is a figure which shows a valve closing state, (b) is a figure which shows a valve opening state (C) is a figure which shows a collar part. It is a figure for demonstrating the elastic member which concerns on 2nd embodiment of this invention, (a) is a perspective view, (b) is a top view.

Explanation of symbols

1 Solenoid valve for fuel cell 10c Valve seat surface (valve seat)
31 Buttocks (Movement Control Department)
31b Chamfered portion 31c Fluorine coating film 72 Valve portion 72a Expanded diameter portion (valve base)
80,180 Elastic member (elastic body part)
82,182 Contact part 83,183 Concave part

Claims (4)

A valve seat,
A valve portion provided so as to be able to be seated and separated from the valve seat;
When the valve portion is separated from the valve seat, a metal movement restricting portion that restricts movement of the valve portion by contacting the valve portion;
A fuel cell solenoid valve comprising:
The valve portion includes a valve base and an elastic body portion that is attached to the outer periphery of the valve base and faces the movement restricting portion.
The surface of the elastic body portion that faces the movement restricting portion is separated from the movement restricting portion in a state where the contact portion that can abut on the movement restricting portion and the contact portion abuts on the movement restricting portion. And a recess for the fuel cell. A chamfered portion having an R shape is provided at an end of the movement restricting portion facing the elastic body portion, and a coating film is formed on at least the side of the movement restricting portion facing the elastic body portion. The fuel cell solenoid valve according to claim 1, wherein: The recesses extend radially and are provided in a plurality at equal intervals in the circumferential direction with respect to the axial center of the elastic body part,
The plurality of concave portions have inner diameter side end portions provided on an inner side of the inner diameter side end portion of the movement restricting portion, and outer diameter side end portions thereof open to the outer peripheral surface of the elastic body portion. The solenoid valve for a fuel cell according to claim 1 or 2, wherein The abutting portions extend radially and are provided in a plurality at equal intervals in the circumferential direction with respect to the axial center of the elastic body portion,
The plurality of abutting portions are formed such that their inner diameter side end portions rise on the outer diameter side with respect to the inner diameter side end portion of the elastic body portion. Solenoid valve for fuel cell.

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