JP2006153215A - Solenoid valve for fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve durability of a solenoid valve for a fuel cell discharging reaction gas and/or remaining water to outside and to facilitate replacement of a valve element in a fuel cell system. <P>SOLUTION: The solenoid valve for the fuel cell (discharge valve) 10 includes a movable member 30 displacing under excitation action of a solenoid part 26, and a valve element member 32 provided with a disk part 40 seated on/separated from a seating part 36 provided on a valve body 16 is connected to a tip part of a movable member 30 by a screw. The movable member 30 is made of magnetic metal and the valve element member 32 is made of, in an embodiment, material excellent in corrosion resistance such as stainless steel. A V-groove 96 is provided on a side circumference wall of the movable member 39 along an axial direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

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

  A solid polymer membrane fuel cell includes a stack in which a plurality of cells formed by sandwiching a solid polymer electrolyte membrane between an anode and a cathode from both sides are stacked. When operating the stack thus configured, hydrogen is supplied as fuel to each anode of the cell, while air is supplied as oxidant to each cathode. Then, hydrogen ions generated by a catalytic reaction at the anode move through the solid polymer electrolyte membrane to the cathode and cause an electrochemical reaction at the cathode to generate power.

  The fuel cell system including the stack includes, for example, an air compressor for supplying air to the cathode side, and further uses the air pressure as a signal pressure to supply hydrogen to the anode side at a pressure corresponding to the air pressure. A pressure control valve is provided to adjust the pressure of the reaction gas on the anode side relative to the cathode side of the fuel cell to a predetermined pressure to ensure a predetermined power generation efficiency and control the flow rate of the reaction gas supplied to the fuel cell By doing so, a predetermined output is set.

  In connection with this technology, the present applicant is provided with an air discharge passage connecting the air discharge port and the air discharge portion or an appropriate position in the passage between the hydrogen discharge portion and the hydrogen discharge port. A fuel cell discharge valve for discharging gas and / or residual water has been proposed (see Patent Document 1).

JP 2004-183681 A

  The present invention has been made in connection with the above proposal, and an object thereof is to provide a solenoid valve for a fuel cell that is excellent in durability, has a good manufacturing yield, and can reduce costs. And

To achieve the above object, the present invention provides a solenoid valve for a fuel cell that discharges a reaction gas and / or residual water in the fuel cell,
A valve body having an introduction port through which the reaction gas and / or residual water is introduced, and a lead-out port through which the reaction gas and / or residual water introduced from the introduction port is discharged;
A solenoid portion provided inside the housing connected to the valve body, and having an exciting action by an electric current;
One end portion faces a fixed member provided inside the solenoid portion, and a movable member that is displaced in a direction approaching the fixed member or a direction away from the fixed member under the excitation action of the solenoid portion,
A valve body member connected to the other end of the movable member and seated or separated from the valve seat as the movable member is displaced;
A guide member that is disposed inside the valve body and the solenoid part and has a locking part for restricting displacement in a direction in which the movable member is inserted and the valve body member is separated from the valve seat;
It is characterized by providing.

  The valve body is usually integrally formed as the same member as the movable member. Since the movable member is made of magnetic metal so as to be displaceable by excitation, the valve body is inevitably also made of magnetic metal.

  On the other hand, in this invention, a movable member and a valve body member are comprised as a separate member. Therefore, the valve body member can be made of an inexpensive metal material, thereby reducing the cost.

  In addition, by configuring the valve body member from, for example, a metal material having excellent corrosion resistance, even when this fuel cell solenoid valve is used for the purpose of discharging residual water from the fuel cell system, sufficient durability is achieved. Can be secured. That is, the life of the fuel cell solenoid valve can be extended.

  In addition, although a stainless steel is mentioned as a suitable example of such a metal material, it is not specifically limited to this.

  In addition, the movable member has a relatively simple shape, such as a cylindrical body, and is therefore handled more easily than a conventional movable member integrally formed as the same member as the valve body portion having a complicated shape. Easy. Therefore, for example, when the side peripheral wall of the movable member is coated with fluorine, it becomes easy to avoid the occurrence of dents and scratches. For this reason, the manufacturing yield of the fuel cell solenoid valve is also improved.

  The movable member and the valve body member are preferably connected via a screw. In this case, when the valve body member changes over time and the valve body member needs to be replaced, the replacement can be easily performed.

  Moreover, it is preferable to provide a groove in the side wall of the movable member along the axial direction of the movable member. Thereby, when the movable member is displaced in the direction approaching the fixed member, the fluid existing in the clearance between the movable member and the fixed member is quickly led out through the groove. On the other hand, when the movable member is displaced in a direction away from the fixed member, the fluid is rapidly introduced into the clearance between the movable member and the fixed member via the groove. For this reason, the displacement speed of the movable member is increased, and eventually the response speed of the fuel cell solenoid valve can be increased.

  According to the present invention, the movable member and the valve body member are configured as separate members. Therefore, the valve body member can be made of, for example, a metal material that is inexpensive and excellent in corrosion resistance, and thus a fuel cell electromagnetic valve exhibiting sufficient durability can be obtained at low cost.

  Further, since the valve body member is separate from the movable member, even if the valve body member changes with time, only the valve body member can be replaced. For this reason, running cost can also be reduced.

  In addition, since the movable member and the valve body member are separate, the movable member is easy to handle.For this reason, for example, when fluorine coating or the like is performed on the side peripheral wall of the movable member, the valve body portion is provided in the same member. As compared with the provided movable member, it is possible to easily avoid the occurrence of dents and scratches. For this reason, the manufacturing yield of the solenoid valve for fuel cells is also improved.

  Hereinafter, preferred embodiments of a solenoid valve for a fuel cell according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows a fuel cell system 200 incorporating a fuel cell solenoid valve according to the present embodiment. The fuel cell system 200 is mounted on a vehicle such as an automobile.

  The fuel cell system 200 is provided, for example, by stacking a plurality of cells formed by sandwiching a polymer electrolyte membrane made of an ion exchange membrane or the like made of a polymer from both sides between an anode and a cathode. A fuel cell stack 202.

  Each cathode of the cell is supplied with air containing oxygen as an oxidant, while each anode is supplied with hydrogen as a fuel. That is, on the cathode side, there is 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. Provided. On the other hand, a hydrogen supply port 214 to which hydrogen from the fuel supply unit 212 is supplied and a hydrogen discharge port 218 to which a hydrogen discharge unit 216 is connected are provided on the anode side. Note that the reaction gas used in this embodiment includes hydrogen, air, and surplus hydrogen.

  In the air supply passage 219 connected to the air supply port 206, the oxidant supply unit 204, the heat dissipation unit 220, and the cathode humidification unit 222 are interposed in this order from the upstream side.

  The oxidant supply unit 204 includes, for example, a supercharger (compressor) (not shown) and a motor that drives the oxidant, and adiabatically compresses air containing oxygen used as an oxidant gas in the fuel cell stack 202. Pump. Air is heated during this adiabatic compression. The compressed air thus heated contributes to warming up the fuel cell stack 202.

  The heat radiating unit 220 is constituted by, for example, an intercooler (not shown). The air supplied from the oxidant supply unit 204 is cooled by exchanging heat with the cooling water flowing along the flow path provided in the heat dissipation unit 220. That is, the air is cooled to a predetermined temperature and then introduced into the cathode humidification unit 222.

  The cathode humidification unit 222 is configured to include, 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 a predetermined temperature by transmitting moisture from one end surface to the other end surface of the water permeable membrane. The humidity is humidified and 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 as a result, moisture is applied to the solid polymer electrolyte membrane of the fuel cell stack 202, so that the ionic conductivity of the membrane is secured to a certain value or more. The

  On the other hand, in the hydrogen supply passage 223 connected to the hydrogen supply port 214, the fuel supply unit 212, the pressure control unit 224, the ejector 226, and the anode humidification unit 228 are interposed in this order from the upstream side. ing. In addition, a hydrogen discharge portion 216 is connected to the hydrogen discharge port 218 via a circulation passage 230.

  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.

  Here, air is supplied to the pressure control unit 224 via the pressure control bypass passage 232. That is, the air supplied from the oxidant supply unit 204 is set to a predetermined pressure and introduced into the fuel cell stack 202 according to, for example, the load of the fuel cell stack 202 or the operation amount of an accelerator pedal (not shown). . Along with this, it is necessary to adjust the pressure of hydrogen. Therefore, the pressure of the air from the pressure control bypass passage 232 is set as a pilot pressure (signal pressure), and the secondary side pressure that is the outlet side pressure of the pressure control unit 224 is set to a pressure within a predetermined range corresponding to the pilot pressure. is doing.

  As understood from FIG. 1, the air cooled by the heat radiating unit 220 is supplied to the pressure control unit 224.

  The ejector 226 includes a nozzle unit and a diffuser unit (not shown), and the hydrogen supplied from the pressure control unit 224 is accelerated and injected toward the diffuser unit when passing through the nozzle unit. When hydrogen flows from the nozzle portion toward the diffuser portion at a high speed, a negative pressure is generated in the side flow chamber provided between the nozzle portion and the diffuser portion, and discharged hydrogen on the anode side through the circulation passage 230. Is sucked. Hydrogen and exhaust hydrogen mixed by the ejector 226 are supplied to the anode humidification unit 228, and the exhaust hydrogen discharged from the fuel cell stack 202 is provided to circulate through the ejector 226.

  As described above, the unreacted discharged hydrogen 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. The exhaust hydrogen discharged from the stack 202 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 end surface to the other end surface of the water permeable membrane to humidify the fuel derived from the ejector 226 to a predetermined humidity. This is supplied to the hydrogen supply port 214 of the fuel cell stack 202. That is, hydrogen is supplied to the fuel cell stack 202 in a humidified state like air, and thereby the ionic conductivity of the solid polymer electrolyte membrane is ensured to be a certain value or more.

  For example, a hydrogen discharge portion 216 having a discharge control valve (not shown) is connected to the hydrogen discharge port 218 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 exposed to the outside of the vehicle. Discharged.

  In the fuel cell stack 202 configured as described above, hydrogen ions generated by a catalytic reaction at the anode move to the cathode through the solid polymer electrolyte membrane, and generate an electric power by causing an electrochemical reaction with oxygen at the cathode. Is set to

  In the fuel cell system 200 configured as described above, the solenoid valve for a fuel cell according to the present embodiment includes an air discharge passage that connects the air discharge port 210 and the air discharge unit 208, and / or hydrogen. It is connected to an appropriate position in the passage between the discharge unit 216 and the hydrogen discharge port 218, and discharges the reaction gas and / or residual water. Of course, the air discharge unit 208 and / or the hydrogen discharge unit 216 may be incorporated.

  FIG. 2 shows a schematic overall vertical cross-sectional view of a fuel cell solenoid valve (hereinafter also referred to as a discharge valve) according to the present embodiment. The discharge valve 10 includes a valve body 16 provided with an introduction port 12 and a lead-out port 14, and a substantially inverted U-shaped cross section connected to the upper portion of the valve body 16 via a guide member 18, a plate member 20, and a cover member 22. A character-shaped housing 24, a solenoid portion 26 provided inside the housing 24, a fixing member 28 provided inside the solenoid portion 26, and approaching or separating from the fixing member 28 and the guide The movable member 30 is movably inserted into the member 18, and the valve body member 32 is connected to one end of the movable member 30. Among these, the guide member 18 regulates the amount of displacement of the valve body member 32 as will be described later.

  The valve body 16 is made of a metal material, and communicates between the introduction port 12 and the lead-out port 14 between the introduction port 12 on the upstream side and the lead-out port 14 on the downstream side, A valve seat portion 36 is provided. The reaction gas and / or residual water that has passed through the air supply passage or the hydrogen supply passage of the cathode humidification section 222 or the anode humidification section 228 (see FIG. 1) passes from the introduction port 12 through the communication chamber 34 to the outlet port 14. Discharged from the outside.

  The introduction port 12 is formed on the side surface of the valve body 16 so as to protrude outward in the radial direction, and a filter 38 is mounted inside the introduction port 12 so that the bottom portion faces the communication chamber 34 side. When dust or the like is contained in the reaction gas and / or residual water introduced from the introduction port 12, the dust or the like is removed by the filter 38, whereby the dust or the like enters the communication chamber 34 of the discharge valve 10. It is prevented.

  The lead-out port 14 is formed so as to protrude from the side surface of the valve body 16 at a position spaced apart from the introduction port 12 by approximately 180 °. For example, a tube (not shown) or the like is connected to the lead-out port 14 via a joint member.

  The valve seat portion 36 is formed so as to protrude upward from the lower surface of the communication chamber 34 by a predetermined length. As will be described later, the disc portion 40 constituting the valve body member 32 is seated and separated from the valve seat portion 36.

  The guide member 18 has a flange portion 42 connected to the upper portion of the valve body 16, and a stopper portion (locking portion) 44 and an inlay portion 46 are arranged in this order from the inner peripheral side on the lower end surface of the flange portion 42. Is provided. The stopper portion 44 and the spigot portion 46 are cylindrical bodies that are separated from each other at a predetermined interval, and are formed to protrude downward.

  Here, the stopper portion 44 is formed so as to extend downward on the lower surface side of the flange portion 42, and the valve body member 32 moves upward along the axial direction under the displacement action of the solenoid portion 26 together with the movable member 30. When the disc portion is displaced, the upper surface of the disk portion 40 comes into contact with and is locked against the lower end surface of the stopper portion 44, and becomes the displacement end position. The length of the stopper portion 44 along the axial direction is such that the protruding portion 50 of the movable member 30 inserted into the concave portion 48 of the fixed member 28 when the upper surface of the disk portion 40 contacts the lower surface of the stopper portion 44. It is set so as not to contact the ceiling surface of the recess 48.

  The outer diameter of the spigot portion 46 is formed to be substantially the same as the inner diameter of the communication chamber 34 of the valve body 16. For this reason, when the guide member 18 is assembled to the upper portion of the valve body 16, the guide member 18 can be easily attached to the valve body 16 by inserting the spigot portion 46 so as to contact the inner peripheral surface of the communication chamber 34. Can be positioned and assembled. Further, the axis of the movable member 30 provided inside the guide member 18 and the valve seat portion 36 of the valve body 16 can be easily aligned.

  One end portion of a coil spring 52 interposed between the guide member 18 and the disc portion 40 of the valve body member 32 is sandwiched between the stopper portion 44 and the spigot portion 46 thus configured. ing.

  An annular groove is provided on the upper surface of the valve body 16, and a seal member 54a is inserted into the annular groove. The seal member 54a provides a seal between the valve body 16 and the flange portion 42.

  A relatively long guide portion 58 is provided on the upper end surface of the flange portion 42 and extends in a thin cylindrical shape along the axial direction, and is inserted into a bobbin 56 described later. The guide portion 58 is formed to have a slightly smaller diameter than the stopper portion 44.

  A guide hole 60 for guiding the movable member 30 when the movable member 30 is displaced along the axial direction is formed in the guide portion 58. The guide portion 58 is inserted so that the outer peripheral wall surface is in contact with the inner peripheral surface of the bobbin 56 and the through hole 62 of the plate member 20, and the tip portion is below the large-diameter portion 64 provided in the fixing member 28. It is in contact with the end face.

  An annular seal member 54 b is mounted in the space surrounded by the upper surface of the plate member 20, the mounting hole 66 of the cover member 22 into which the guide portion 58 is inserted, and the outer peripheral wall surface of the guide portion 58. The sealing member 54b keeps the airtightness of the solenoid portion 26 inside.

  The plate member 20 is formed in an annular shape from a magnetic metal material, and is integrally connected to the upper portion of the guide member 18. A through hole 62 penetrating along the axial direction is formed in a substantially central portion of the plate member 20, and the guide portion 58 of the guide member 18 is inserted into the through hole 62.

  On the side surface of the cover member 22 connected to the upper portion of the plate member 20, a connector portion 70 connected to a power source (not shown) for supplying current to the solenoid portion 26 is provided. The connector portion 70 is provided with a terminal 72 made of a metal material so that one end portion is exposed inside the connector portion 70, and the terminal 72 is connected to the bobbin 56 of the solenoid portion 26 via the inside of the cover member 22. Yes. The terminal 72 is connected to the power source via a lead wire (not shown).

  Further, a protruding portion 74 protruding radially inward is formed on the upper end surface of the cover member 22, and a seal member 54 c is attached to the annular groove formed on the upper end surface of the protruding portion 74. . The seal member 54c provides a seal between the cover member 22 and the housing 24. In other words, the airtightness inside the housing 24 is maintained.

  The solenoid portion 26 has a coil 76 wound around an outer peripheral surface thereof and an annularly disposed bobbin 56 so as to contact the inner peripheral wall of the cover member 22, and the inside of the bobbin 56 along the axial direction. The movable member 30 is provided so as to be displaceable, and the fixed member 28 is integrally connected to the upper portion of the housing 24 via a cap nut 78 and is disposed so as to face the movable member 30.

  A first enlarged-diameter portion 80 and a second enlarged-diameter portion 82 are formed at the lower end portion and the upper end portion of the bobbin 56 so as to increase the diameter outward in the radial direction, respectively.

  An annular groove 84 is provided in the first enlarged diameter portion 80, and a convex portion 86 provided on the lower end surface of the cover member 22 is engaged with the annular groove 84. On the other hand, the upper end surface of the second enlarged diameter portion 82 is in contact with the lower end surface of the overhang portion 74. That is, inside the cover member 22, the bobbin 56 around which the coil 76 is wound is integrally engaged, whereby the entire bobbin 56 is surrounded by the cover member 22.

  An insertion hole 88 penetrating along the axial direction is formed in a substantially central portion of the bobbin 56. The fixing member 28 is inserted into the insertion hole 88 at the upper portion thereof, and the guide portion 58 of the guide member 18 is inserted into the lower portion thereof. As described above, the distal end portion of the guide portion 58 is in contact with the lower end surface of the large diameter portion 64 provided in the fixing member 28.

  The fixing member 28 is formed in a cylindrical shape from a magnetic metal material, and a threaded portion 90 is formed so as to protrude upward at a substantially central portion of the upper portion. The cap nut 78 is screwed through a washer 94 above the threaded portion 90 that is inserted into and protrudes through a hole 92 provided in the substantially central portion above the housing 24. As a result, the fixing member 28 is integrally connected to the housing 24.

  In addition, a concave portion 48 that is depressed upward by a predetermined depth is formed in a substantially central portion of the lower surface of the fixing member 28.

  The movable member 30 has a substantially cylindrical shape, and two V grooves 96 are provided on the side peripheral wall at positions spaced apart from each other by 180 ° along the axial direction. Due to the presence of the V-groove 96, the clearance between the movable member 30 and the fixed member 28 and the communication chamber 34 communicate with each other.

  The movable member 30 is also made of a magnetic metal material like the fixed member 28 and can be displaced within the guide portion 58. In the movable member 30, a protruding portion 50 is formed to protrude from the substantially central portion of the upper end surface facing the fixed member 28 side.

  The protruding portion 50 is formed to have a slightly smaller diameter than the main body of the movable member 30 and is inserted into the concave portion 48 of the fixed member 28 when the movable member 30 is displaced upward. The height along the axial direction of the protrusion 50 is set to be approximately equal to or slightly smaller than the depth along the axial direction of the recess 48.

  Further, a small diameter portion 100 is provided on the lower end portion side of the movable member 30, and the screw hole extends from the distal end surface of this small diameter portion 100 (the lower end surface of the movable member 30) to the approximate center in the axial direction of the plate member 20. 102 is provided.

  The valve body member 32 has a shaft portion 104 having a smaller diameter than the movable member 30, and a screw portion 106 is formed on the shaft portion 104. The valve body member 32 is connected to the movable member 30 by screwing the screw portion 106 into the screw hole 102.

  Further, the valve body member 32 has a tapered portion 108 that gradually increases in diameter from the lower portion of the shaft portion 104 downward, and the disk portion 40 is formed at the tip (lower end in FIG. 2) of the tapered portion 108. Has been. As described above, the lower end surface of the disk portion 40 is seated or separated from the valve seat portion 36. The disk portion 40 is inserted into the communication chamber 34 with a predetermined clearance between the disk portion 40 and the inner peripheral surface of the communication chamber 34.

  Further, the upper end surface of the disk part 40 is formed with a spring receiving part 110 protruding upward by a predetermined length.

  The valve body member 32 configured as described above is made of a metal material that is inexpensive and excellent in corrosion resistance, such as stainless steel.

  An annular first mounting groove 112 that is recessed from the lower surface by a predetermined depth is provided on the lower surface of the disk portion 40, and a first sheet 114 made of an elastic member is mounted on the first mounting groove 112. The Similarly, an annular second mounting groove 116 that is recessed from the upper surface by a predetermined depth is provided on the upper surface of the disk portion 40, and a second sheet 118 made of an elastic member is mounted in the second mounting groove 116. A suitable material for the first sheet 114 and the second sheet 118 is exemplified by rubber.

  The first seat 114 is mounted at a position where it comes into contact with the valve seat portion 36 when the disc portion 40 is seated on the valve seat portion 36, while the second seat 118 is displaced from the upper end surface when the disc portion 40 is displaced upward. Is mounted at a position where it comes into contact with the front end surface of the stopper portion 44 when it comes into contact with the stopper portion 44.

  The first mounting groove 112 and the second mounting groove 116 communicate with each other through a communication hole 120 formed in the disk portion 40 along the axial direction. And the 1st sheet | seat 114 and the 2nd sheet | seat 118 are integrally connected by the connection sheet | seat 122 which consists of an elastic material with which the inside of the communicating hole 120 is loaded. That is, the first sheet 114 and the second sheet 118 are formed by filling the first mounting groove 112 and the second mounting groove 116 with an elastic material and solidifying them. At this time, for example, by filling the first mounting groove 112 with an elastic material, the elastic material is also filled into the second mounting groove 116 through the communication hole 120. For this reason, the 1st sheet | seat 114, the connection sheet | seat 122, and the 2nd sheet | seat 118 can be easily integrally formed, and can be mounted | worn simply and efficiently.

  In addition, the integral formation prevents the first sheet 114 and the second sheet 118 from dropping from the first mounting groove 112 and the second mounting groove 116, respectively.

  The coil spring 52 interposed between the upper end surface of the disc portion 40 and the lower end surface of the flange portion 42 of the guide member 18 is in a direction in which the valve body member 32 is seated on the valve seat portion 36 by its elastic force. Energized. The coil spring 52 is guided along the axial direction by the outer peripheral surface of the stopper portion 44 of the guide member 18. For this reason, the coil spring 52 is expanded and contracted along the axial direction without causing positional displacement while being reliably guided by the stopper portion 44.

  The coil spring 52 is prevented from falling off from the lower end surface of the flange portion 42 by having one end portion sandwiched between the stopper portion 44 and the spigot portion 46. On the other hand, the other end portion is blocked by a spring receiving portion 110 provided on the upper end surface of the disc portion 40, thereby preventing the coil spring 52 from falling off the disc portion 40.

  The housing 24 is made of a magnetic metal material and is mounted so as to surround the cover member 22 from above.

  The fuel cell solenoid valve (discharge 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.

  In the fuel cell system 200 shown in FIG. 1, the discharge valve 10 is an air discharge passage connecting the air discharge port 210 and the air discharge portion 208 or a passage between the hydrogen discharge port 218 and the hydrogen discharge portion 216. Provided at an appropriate position, the introduction port 12 (see FIG. 2) of the discharge valve 10 is connected to the air discharge passage or the passage. And the tube etc. which are not shown in figure are connected to the derivation | leading-out port 14 (refer FIG. 2).

  FIG. 2 shows a state in which no current is supplied to the coil 76, that is, a non-excited state, and the disc portion 40 (first sheet 114) of the valve body member 32 connected to the distal end portion of the movable member 30. A valve closed state is shown in which the communication between the introduction port 12 and the outlet port 14 is blocked by being seated on the valve seat portion 36.

  In such an off state, a power source (not shown) is energized to energize the coil 76 through the terminal 72 of the connector unit 70, thereby exciting the coil 76, and the magnetic flux is moved from the coil 76 to the movable member under the excitation action. It is generated so that it goes to 30 and returns to the coil 76 again to circulate.

  As a result, the movable member 30 is displaced upward along the axial direction against the elastic force of the coil spring 52, and accordingly, the valve body member 32 connected to the distal end portion of the movable member 30 is also upward. Finally, the disc part 40 (first seat 114) constituting the valve body member 32 is separated from the valve seat part 36.

  Then, the second sheet 118 mounted on the disk portion 40 comes into contact with the stopper portion 44 of the guide member 18 and reaches the displacement end position. At this time, the contact when the disk portion 40 is displaced to the displacement end position is relieved by the second sheet 118 made of an elastic material, and the contact sound is reduced.

  At the same time, the protrusion 50 of the movable member 30 is inserted into the recess 48 of the fixed member 28.

  Thus, when the disc part 40 is separated from the valve seat part 36, the discharge valve 10 will be in a valve open state. Along with this, the reaction gas and / or residual water is introduced from the introduction port 12 and enters the inside of the valve body 16 through the clearance between the disk portion 40 and the inner peripheral surface of the communication chamber 34, and the outlet port 14. It is discharged to the outside through.

  When stopping the discharge of the reaction gas and / or residual water to the outside, the coil 76 is brought into a non-excited state by stopping energization of the coil 76 from a power source (not shown). As a result, the upward displacement force urged by the movable member 30 is lost, and at the same time, the movable member 30 is elastically urged downward by the coil spring 52, and the second part of the disc part 40 of the valve body member 32. The sheet 118 is separated from the lower end surface of the stopper portion 44. As a result, the disc part 40 is seated on the valve seat part 36 and the communication between the introduction port 12 and the outlet port 14 is blocked. That is, the state returns to the state shown in FIG.

  At this time, the first seat 114 mounted in the first mounting groove 112 of the disk portion 40 is in close contact with the upper surface of the valve seat portion 36, and thereby the airtightness of the communication chamber 34 is more reliably maintained.

  Thus, the discharge of the reaction gas and / or the residual water from the air supply passage or the hydrogen supply passage through the discharge valve 10 is stopped.

  While the movable member 30 and the valve body member 32 are displaced upward, the fluid existing in the clearance between the fixed member 28 and the movable member 30 communicates with the communication chamber via the V groove 96 provided on the side peripheral wall of the movable member 30. 34 quickly distributed. For this reason, the fluid does not stay in the clearance between the fixed member 28 and the movable member 30, and therefore, the movable member 30 is not pressed by the staying gas and the displacement is not suppressed.

  On the other hand, while the movable member 30 and the valve body member 32 are displaced downward, the clearance between the fixed member 28 and the movable member 30 is provided with a V groove 96 provided on the side peripheral wall of the movable member 30 from the communication chamber 34. Through the fluid quickly. For this reason, the movable member 30 and the valve body member 32 are pressed by the fluid introduced into the clearance and rapidly displaced downward.

  That is, by providing the V-groove 96 in the side peripheral wall of the movable member 30, the displacement of the movable member 30 and the valve body member 32, and consequently the seating / separation of the disc portion 40 of the valve body member 32 with respect to the valve seat portion 36 can be performed quickly. Is called. As a result, the response speed of the discharge valve 10 can be improved.

  Here, in the present embodiment, the valve body member 32 is a separate member from the movable member 30, and the valve body member 32 is made of a material having excellent corrosion resistance such as stainless steel, for example. . Therefore, as the discharge valve 10 operates as described above, even if wet reaction gas or residual water passes through the discharge valve 10, the valve body member 32 is remarkably suppressed from corroding. For this reason, the durability of the discharge valve 10 is improved and the life is prolonged.

  Moreover, since the valve body member 32 can be comprised with cheap stainless steel etc., it is advantageous in cost.

  Furthermore, even if the valve body member 32 has changed over time due to operation over a long period of time and needs to be replaced, the valve body member 32 and the movable member 30 are connected via screws, so replacement is necessary. It can be done very easily. In addition, since only the valve body member 32 needs to be replaced, the running cost of the discharge valve 10 is reduced as compared with the case where the movable member in which the valve body portion is integrally formed is replaced.

  In addition, in this case, the movable member 30 has a relatively simple cylindrical body shape. Therefore, compared to a conventional movable member that is the same member as the valve body portion having a complicated shape similar to the valve body member 32. Thus, handling becomes extremely easy. Therefore, for example, when a fluorine coating is applied to the side peripheral wall of the movable member 30, it is possible to easily avoid a dent or a scratch on the movable member 30.

  In the present embodiment, since the stopper portion 44, the spigot portion 46, the flange portion 42, and the guide portion 58 are integrally formed as the guide member 18, that is, the same member, each is provided separately. The number of parts can be reduced as compared with the guide member 18, and the assembly workability when the guide member 18 is assembled into the cover member 22, the valve body 16 and the plate member 20 can be improved. Man-hours can be reduced.

  A coil spring 52 is interposed between the upper end surface of the disc portion 40 of the valve body member 32 and the flange portion 42 of the guide member 18, and the inner peripheral side of the coil spring 52 is brought into contact with the outer peripheral surface of the stopper portion 44. The stopper portion 44 serves to guide the coil spring 52 by being disposed so as to contact. For this reason, there is no need to separately provide a member for guiding the coil spring 52, so that the number of parts does not increase.

  Furthermore, an inlay portion 46 is integrally provided on the lower end surface of the flange portion 42 of the guide member 18, and the outer peripheral surface thereof is inserted so as to contact the inner peripheral surface of the communication chamber 34 formed inside the valve body 16. Accordingly, the guide member 18 can be reliably positioned with respect to the valve body 16. Therefore, the axis of the movable member 30 that is displaced along the axial direction in the guide member 18 and the axis of the valve seat portion 36 formed at a position facing the disc portion 40 in the valve body 16 are easily matched. As a result, the assembly accuracy can be improved. Therefore, the assembly workability can be improved, and the number of assembly work steps can be reduced accordingly. In addition, since the spigot part 46 is also provided integrally with the guide member 18, the number of parts can be further reduced.

  Further, a cylindrical guide portion 58 to be inserted into the bobbin 56 is formed on the upper portion of the flange portion 42 of the guide member 18, and the movable member 30 is inserted into the guide hole 60 inside the guide member 60 so as to be displaceable. For this reason, since the movable member 30 is guided along the axial direction by the guide hole 60, the displacement of the movable member 30 can be reliably set in the axial direction.

  In the above-described embodiment, the V-groove 96 is provided on the side peripheral wall of the movable member 30, but it goes without saying that the shape of the groove is not particularly limited thereto.

  Further, the number of grooves such as the V groove 96 is not limited to two, and may be one or three or more.

1 is a configuration diagram of a fuel cell system in which a discharge valve (a solenoid valve for a fuel cell) according to the present embodiment is incorporated. It is a schematic whole longitudinal cross-sectional view which shows the discharge valve (valve closed state) which concerns on this Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Fuel cell solenoid valve (discharge valve) 12 ... Introducing port 14 ... Deriving port 16 ... Valve body 18 ... Guide member 20 ... Plate member 22 ... Cover member 24 ... Housing 26 ... Solenoid part 28 ... Fixed member 30 ... Movable member 32 ... Valve body member 34 ... Communication chamber 36 ... Valve seat part 40 ... Disk part 42 ... Flange part 44 ... Stopper part (locking part) 46 ... Inlay part 52 ... Coil spring 56 ... Bobbin 58 ... Guide part 70 ... Connector part 72 ... Terminal 76 ... Coil 96 ... V groove 98 ... Buffer material 102 ... Screw hole 106 ... Screw part 114, 118, 122 ... Sheet

Claims (3)

A fuel cell solenoid valve for discharging a reaction gas and / or residual water in a fuel cell,
A valve body having an introduction port through which the reaction gas and / or residual water is introduced, and a lead-out port through which the reaction gas and / or residual water introduced from the introduction port is discharged;
A solenoid portion provided inside the housing connected to the valve body, and having an exciting action by an electric current;
One end portion faces a fixed member provided inside the solenoid portion, and a movable member that is displaced in a direction approaching the fixed member or a direction away from the fixed member under the excitation action of the solenoid portion,
A valve body member connected to the other end of the movable member and seated or separated from the valve seat as the movable member is displaced;
A guide member that is disposed inside the valve body and the solenoid part and has a locking part for restricting displacement in a direction in which the movable member is inserted and the valve body member is separated from the valve seat;
A solenoid valve for a fuel cell, comprising:   2. The electromagnetic valve for a fuel cell according to claim 1, wherein the movable member and the valve body member are connected to each other via a screw.   3. The fuel cell solenoid valve according to claim 1, wherein a groove is provided in a side wall of the movable member along an axial direction of the movable member. 4.

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