JP2011074936A - Solenoid valve for fuel cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solenoid valve for a fuel cell capable of improving the performance for draining water staying inside of the solenoid valve for the fuel cell. <P>SOLUTION: This solenoid valve for the fuel cell includes: a valve body 10 including a lead-in port 10a, into which a fluid is led, and a lead-out port 10b, through which the fluid led-in through the lead-in port 10a is drained; and a vale element 70 provided freely to sit and separate on/from a valve seat 10c of the valve body 10 to switch a communicating condition and a shut-off condition between the lead-in port 10a and the lead-out port 10b. Axes P1 and P2 of the lead-in port 10a are offset from an axis C1 of the valve body 10, and orthogonal to the axis C1 of the valve body 10. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

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

  Conventionally, a polymer electrolyte fuel cell (PEFC) is configured by stacking a plurality of cells on a cell formed by sandwiching a polymer electrolyte membrane between an anode and a cathode from both sides. A stack (hereinafter referred to as a fuel cell), hydrogen (fuel gas, reaction gas) is supplied to the anode as fuel, and oxygen-containing air (oxidant gas, reaction gas) is supplied to the cathode. Thus, hydrogen ions generated by the catalytic reaction pass through the solid polymer electrolyte membrane and move to the cathode, causing an electrochemical reaction at the cathode to generate electric power.

  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 solenoid valve for a fuel cell that is provided at an appropriate position of an air flow path and / or a hydrogen flow path in the fuel cell and discharges a fluid such as a reaction gas or water to the outside of the fuel cell. (See Patent Document 1).

JP 2006-153207 A

  By the way, if water accumulates in the fuel cell solenoid valve, the valve body provided in the fuel cell solenoid valve may freeze and adhere to the valve seat when exposed to a low temperature environment such as below freezing point. There is. Therefore, there has been a demand for further improving the discharge performance of water staying in the fuel cell solenoid valve.

  This invention is made | formed in view of the said point, and makes it a subject to provide the solenoid valve for fuel cells which can improve the discharge | emission property of the water which retains in the solenoid valve for fuel cells.

  In order to achieve the above object, the present invention provides a valve body having an introduction port through which a fluid is introduced, a discharge port through which the fluid introduced from the introduction port is discharged, and a valve seat of the valve body. A fuel cell solenoid valve comprising: a valve body that is configured to be seated or separable with respect to the valve, and that switches between a communication state and a shut-off state between the introduction port and the lead-out port. The axis is offset from the axis of the valve body and is orthogonal to the axis of the valve body.

  Note that one introduction port may be provided, or a plurality of introduction ports may be provided.

  According to the present invention, since the axis of the introduction port is offset from the axis of the valve body, the fluid introduced into the valve body from the introduction port flows toward the position deviated from the axis of the valve body. Since a swirl flow (vortex) is generated along the inner peripheral surface of the body, for example, water (moisture) staying in the valve body is easily involved in the swirl flow (accompanying) and flows into the outlet port. Therefore, it becomes difficult for water to stay in the valve body, and the discharge performance can be improved.

  In addition, since the axis of the introduction port is orthogonal to the axis of the valve body, the fluid introduced into the introduction port flows into the valve body without decelerating in the introduction port. Speed up all over.

  The introduction port is preferably provided at the side of the valve body, and the outlet port is preferably provided at the center or substantially the center of the bottom of the valve body. In this way, the center of the generated swirling flow and the center of the derivation port coincide or substantially coincide with each other, so that the flow loss (inflow loss) when the swirling flow containing water (moisture) flows into the derivation port is reduced. It is suppressed. Therefore, the water staying in the valve body is caught in the swirling flow and more easily flows into the outlet port, and the discharge performance can be further improved.

  ADVANTAGE OF THE INVENTION According to this invention, the solenoid valve for fuel cells which can improve the discharge property of the water which retains in the solenoid valve for fuel cells 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 a longitudinal cross-sectional view for demonstrating the structure of the solenoid valve for fuel cells which concerns on embodiment of this invention. It is a longitudinal cross-sectional view for demonstrating the structure of the introduction port which concerns on embodiment of this invention. It is a cross-sectional view for demonstrating the structure of the introduction port 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. BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic for demonstrating the structure of the Example of the solenoid valve for fuel cells of this invention, and a figure which shows flow velocity distribution, (a) is a figure which shows Example 1, (b) is a figure which shows Example 2. FIG. (C) is a figure which shows Example 3. FIG. It is the schematic for demonstrating the structure of the Example of the solenoid valve for fuel cells of this invention, and a figure which shows flow-velocity distribution, (a) is a figure which shows Example 4, (b) is a figure which shows Example 5. FIG. It is. It is the schematic for demonstrating the structure of the comparative example of the solenoid valve for fuel cells outside this invention, and the figure which shows flow velocity distribution, (a) is a figure which shows the comparative example 1, (b) shows the comparative example 2. FIG. FIG. 4C is a diagram showing Comparative Example 3.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. 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, 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.

  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.

  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.

  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 discharge port 10b to be (discharged). The valve body 10 is formed of a metal material (for example, stainless steel), and a main body portion (side portion) 11 in which the valve body 70 is displaceably provided, and protrudes downward from the main body portion 11. A projecting portion (bottom portion) 12 formed on the upper surface of the main body 11, and a mounting flange 13 formed on the upper end of the main body 11 by expanding in the radially outward direction. 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 BT1 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 portion 11 of the valve body 10 is formed in a bottomed cylindrical shape, and a joint portion between a side wall 11 a formed in parallel with the axis of the main body portion 11 and a bottom wall 11 b orthogonal to the axis of the main body portion 11. Is formed with a tapered surface 11c inclined at a predetermined angle along the peripheral surface of the outer peripheral surface. The tapered surface 11c is formed so as to be inclined at about 45 degrees with respect to the side wall 11a and the bottom wall 11b. A plurality of (four in the present embodiment) introduction ports 10a penetrating in the horizontal direction are formed at the boundary between the side wall 11a and the tapered surface 11c. The introduction port 10 a communicates with a communication chamber 11 d formed inside the main body 11, and an annular introduction formed inside the holding block 110 when the valve body 10 is attached to the holding block 110. It is formed at a position facing the chamber 114.

FIG. 3 is a longitudinal sectional view for explaining the configuration of the introduction port, and FIG. 4 is a transverse sectional view for explaining the configuration of the introduction port.
As shown in FIG. 3, the introduction port 10 a is formed in parallel to the valve seat surface (valve seat) 10 c of the valve body 10. The introduction port 10a is formed in a direction orthogonal to the axis (center line) C1 of the main body 11. In other words, the axis lines (center lines) P1 and P2 of the introduction port 10a are formed so as to be inclined by about 90 degrees with respect to the axis line C1 of the main body part 11, and on the surface orthogonal to the axis line C1 of the main body part 11. It is formed in parallel to. In other words, when viewed from the direction perpendicular to the axis C1 of the main body 11, the axes P1 and P2 of the introduction port 10a are orthogonal to the axis C1 of the main body 11.

  As shown in FIG. 4, the introduction port 10 a is disposed so as to intersect with the diameter direction of the main body 11. Further, the axes P1 and P2 of the introduction port 10a are offset from the axis C1 of the main body 11 by a predetermined distance L1. Further, when the axis lines P1 and P2 of the introduction port 10a are projected on a cross section having the axis line C1 of the main body portion 11 as a normal line, the axis lines P1 and P2 of the introduction port 10a are displaced from the axis line C1 of the main body portion 11. Pass through. In other words, the axis lines P1 and P2 of the introduction port 10a do not pass through the axis line C1 of the main body part 11, but are at an angle θ with respect to a straight line C2 passing through the intersection Z of the inner peripheral surface of the main body part 11 and the axis line C1 of the main body part 11. Will just be inclined. In other words, when viewed from the axis C1 of the main body 11, the axes P1 and P2 of the introduction port 10a pass through positions away from the axis C1 of the main body 11. The openings on the inner peripheral side of the four introduction ports 10 a are formed at equal angular intervals in the circumferential direction of the main body 11. In the present embodiment, since the main body portion 11 and the valve body 70 of the valve body 10 are provided coaxially, the axis C1 of the main body portion 11 is also the axis (center line) of the valve body 70.

  Returning to FIG. 2, an O-ring A <b> 1 is attached to the side wall 11 a 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, the space between the inner peripheral surface of the holding block 110 and the outer peripheral surface of the main body 11 is held airtight.

  The protrusion 12 protrudes downward from the center of the bottom wall 11b of the main body 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 11. Yes. 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 the water introduced into the communication chamber 11d is led out 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 10 b and the communication path 12 a are formed so as to be coaxial with the axis C <b> 1 of the main body 11, and are provided at the center of the protrusion 12. The bottom wall 11b of the main body portion 11 where the communication passage 12a opens functions as a valve seat surface 10c on which a seat portion 81 of the valve body 70 described later is seated and separated. The lead-out port 10b and the communication path 12a may be provided at the approximate center of the protruding portion 12.

  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.

  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. As a result, the space between the inner peripheral surface of the holding block 110 and the outer peripheral surface of the protruding portion 12 is held airtight.

  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 BT1 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 BT1.

  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 flange portion 22 and the mounting flange 13. Thereby, the inside of the valve body 10 into which the cylindrical portion 21 is inserted is securely and airtightly retained.

  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 from a metal material into a thin cylindrical shape, and the upper surface of the flange portion 31 formed thick in the radial outward direction. However, 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 portion 31 (the surface facing the elastic member 80) has a planar shape, and chamfered portions 31a and 31a having an R shape are formed at inner and outer ends thereof. The surface of the color guide 30 is covered with a fluorine coating film.

  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.

  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. The O-ring A3 is sandwiched between the resin sealing body 40 and a housing 50 described later, whereby the resin sealing body 40 and the housing 50 are kept airtight.

  The housing 50 is formed in a substantially U-shaped cross section from a metal material made of a magnetic material, and is mounted so as to cover the resin sealing body 40, a part of the guide body 20 and a part of the valve body 10 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.

  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 CN 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 the upper portion thereof inserted into the hole 51 of the housing 50, and then a washer W1 is inserted thereinto and the cap nut CN 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 64. . 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.

  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 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 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 larger than that of the third shaft 71c. And an elastic member 80 made of an elastic material (for example, a material having elasticity more than the enlarged-diameter portion 72a such as fluorine rubber) so as to surround the 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.

  In addition, a seat portion 81 that protrudes 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 seat portion 81 is the inner diameter of the communication passage 12 a that opens to the main body portion 11 of the valve body 10. Is formed larger. That is, the seat 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 opened to the valve seat surface 10c, whereby the communication state between the communication chamber 11d and the outlet port 10b is blocked. The

  The bottom surface of the enlarged diameter portion 72 a is exposed without being covered by the elastic member 80 on the inner peripheral side of the sheet portion 81 of 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.

  The elastic member 80 is separated from the flange 31 in the state where the contact portion 82 that can contact the flange 31 and the contact portion 82 are in contact with the flange 31 on the upper surface side facing the flange 31. And a recessed portion 83. 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 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 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. 5A 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. 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. 5B, the movable core 64 is displaced upward along the axial direction against the elastic force of the return spring 65, and the seat portion 81 of the valve body 70 is moved to the body portion 11. 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. As a result, the fuel cell solenoid valve 1 is switched from the off state to the on state (valve open state).

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

  Further, when stopping the discharge of water to the outside in such an ON state, the seat portion 81 of the valve body 70 is again seated on the valve seat surface 10c of the main body portion 11, and 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.

  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.

  According to the present embodiment described above, the introduction port 10a is arranged so as to intersect the diameter direction of the main body portion 11 of the valve body 10, so that the water introduced from the introduction port 10a into the communication chamber 11d becomes the main body portion. 11 flows from the axis C1 (leading port 10b) to the position deviated, and a swirling flow is generated along the inner peripheral surface of the communication chamber 11d. Therefore, water staying in the communication chamber 11d (valve seat surface 10c) swirls. It becomes easy to flow into the outlet port 10b by being caught in the flow. Therefore, it becomes difficult for water to stay in the communication chamber 11d (valve seat surface 10c), and the discharge performance can be improved.

  In the present embodiment, the introduction port 10a is formed in parallel to the valve seat surface 10c of the valve body 10, so that water introduced into the introduction port 10a communicates without decelerating in the introduction port 10a. Since it flows into the chamber 11d, the flow of water is accelerated throughout the communication chamber 11d.

  Further, in the present embodiment, the introduction port 10a is provided on the side wall 11a of the main body 11 and the outlet port 10b is provided at the center (or substantially the center) of the projecting portion 12, so that the center of the generated swirl flow and the outlet are derived. Since the center of the port 10b matches (or substantially matches), flow loss (inflow loss) when a swirling flow containing water (water) flows into the outlet port 10b is suppressed. Therefore, the water staying in the communication chamber 11d (valve seat surface 10c) is caught in the swirling flow and more easily flows into the outlet port 10b, and the discharge performance can be further improved.

  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 electromagnetic valve 1 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).

  Moreover, in this embodiment, although the valve seat surface 10c of the valve body 10 was formed in the horizontal surface, it is not limited to this, As the valve seat surface 10c of the valve body 10 goes to radial inner direction (derivation | leading-out port 10b). You may form it so that it may incline below (taper shape which diameters reduce gradually). Thereby, the water staying on the valve seat surface 10c of the valve body 10 flows along the valve seat surface 10c by its own weight and flows into the outlet port 10b, so that the discharge performance can be further improved.

  In the present embodiment, the four introduction ports 10a are provided. However, the present invention is not limited to this, and at least one introduction port 10a may be provided.

  Further, in this embodiment, the introduction port 10a is formed in parallel to the valve seat surface 10c of the valve body 10. However, the present invention is not limited thereto, and is substantially parallel to the valve seat surface 10c of the valve body 10. The introduction port 10a may be formed. For example, the introduction port 10a may be formed so as to be inclined 5 degrees downward from the inside of the main body portion 11 to the outside (upward in the introduction direction with respect to the valve seat surface 10c) with respect to the valve seat surface 10c. The introduction port 10a may be formed so as to be inclined 5 degrees upward from the inside of the main body 11 toward the outside (downward in the introduction direction with respect to the valve seat surface 10c).

  Next, the fuel cell solenoid valve 1 of the present invention will be described in more detail with reference to FIGS. 6 to 8 by way of examples and comparative examples. 6 and 7 are a schematic diagram for explaining the configuration of an embodiment of the solenoid valve for a fuel cell of the present invention and a diagram showing a flow velocity distribution, and FIG. 8 is a diagram of a solenoid valve for a fuel cell other than the present invention. It is the figure for demonstrating the structure of a comparative example, and a figure which shows flow-velocity distribution. In the embodiment, the main body (valve body) is A, the introduction port is B (B1 to B4), the communication chamber is C, the lead-out port is D, the communication port is E, the wall of the main body is F, and the valve seat surface is G And In addition, the flow rate of the water which flows through the valve-seat surface side of the communicating chamber of the solenoid valve for fuel cells which concerns on an Example and a comparative example was measured.

Example 1
In this embodiment, as shown in FIG. 6A, four introduction ports B1 to B4 are arranged so as to intersect with the diameter direction of the main body A, and the introduction ports B1 to B4 are valve seat surfaces of the main body A. It was set as the structure formed in parallel with F.

(Example 2)
In this example, as shown in FIG. 6 (b), the same configuration as that of Example 1 was adopted except that three introduction ports B1 to B3 were formed.

(Example 3)
In this example, as shown in FIG. 6C, the same configuration as that of Example 1 was adopted except that two introduction ports B1 and B2 were formed.

Example 4
In this example, as shown in FIG. 7A, the same configuration as that of Example 1 was adopted except that one introduction port B1 was formed.

(Example 5)
In this embodiment, as shown in FIG. 7 (b), the introduction ports B1 to B4 are substantially parallel to the valve seat surface F of the main body A (5 degrees downward from the inside of the main body A toward the outside). Except for being formed, the same configuration as in Example 1 was adopted.

  According to Examples 1 to 5 described above, the water introduced into the communication chamber C from the introduction port B by arranging the single or plural introduction ports B so as to intersect with the diameter direction of the main body portion A, Since it flows toward the position deviated from the axis C1 (lead-out port D) of the main body A, a swirl flow along the inner peripheral surface of the communication chamber C is generated. Further, as shown in FIGS. 6 and 7, the introduction port B is formed in parallel or substantially parallel to the valve seat surface G of the main body A, so that the water introduced into the introduction port B is introduced into the introduction port B. Since the water flows into the communication chamber C without being decelerated in B, the flow of water is accelerated throughout the communication chamber C.

(Comparative Example 1)
In this comparative example, as shown in FIG. 8 (a), four introduction ports are arranged coaxially with the diameter direction of the main body, and the introduction ports from the inside of the main body with respect to the valve seat surface of the main body. It was set as the structure which inclined 45 degree | times downward toward the exterior.

(Comparative Example 2)
In this comparative example, as shown in FIG. 8 (b), eight introduction ports are arranged coaxially with the diameter direction of the main body, and the introduction ports from the inside of the main body with respect to the valve seat surface of the main body. It was set as the structure which inclined 45 degree | times downward toward the exterior.

(Comparative Example 3)
In this comparative example, as shown in FIG. 8 (c), four introduction ports are arranged so as to intersect with the diameter direction of the main body, and the introduction ports from the inside of the main body with respect to the valve seat surface of the main body. It was set as the structure which inclined 45 degree | times downward toward the exterior.

  According to Comparative Examples 1 to 3 described above, the introduction port is arranged coaxially with the diameter direction of the main body, so that water introduced from the introduction port into the communication chamber is directed toward the axis C1 of the main body. Therefore, it is presumed that a swirl flow along the inner peripheral surface of the communication chamber is unlikely to be generated, or that a gentle swirl flow is generated even if it occurs. Further, as shown in FIG. 8, the introduction port is formed to be inclined 45 degrees downward from the inside of the main body portion toward the outside with respect to the valve seat surface of the main body portion, so that the water introduced into the introduction port is formed. However, since it flows into the communication chamber against the dead weight in the introduction port, the water flow area in the communication chamber is mixed with non-uniform areas, and water flows smoothly into the center outlet port. Is estimated to be difficult.

  When the introduction port is arranged coaxially with the diameter direction of the main body portion in comparison with the embodiment and the comparative example from the above verification results, it is difficult to generate a swirling flow along the inner peripheral surface of the communication chamber, or temporarily Even if it occurs, it becomes a gentle swirling flow, and water tends to stay in the communication chamber (valve seat surface). However, if the introduction port B is arranged so as to intersect the diameter direction of the main body A, the communication chamber C It has been demonstrated that a swirl flow along the inner peripheral surface is generated and water is less likely to stay in the communication chamber C (valve seat surface G). In addition, when the introduction port is formed to be inclined 45 degrees downward from the inside of the main body portion to the outside with respect to the valve seat surface of the main body portion, a region where the water flow is fast and a slow region are mixed in the communication chamber. However, when the introduction port B is formed in parallel or substantially in parallel to the valve seat surface F of the main body A, it has been demonstrated that the water flow is accelerated throughout the communication chamber C.

DESCRIPTION OF SYMBOLS 1 Solenoid valve for fuel cells 10 Valve body 10a Inlet port 10b Outlet port 10c Valve seat surface (valve seat) 11 Main part (side part)
12 Projection (bottom) 70 Valve body

Claims (3)

A valve body having an introduction port through which a fluid is introduced, and a lead-out port through which the fluid introduced from the introduction port is discharged;
A valve body provided so as to be capable of being seated or separated from the valve seat of the valve body, and switching between a communication state and a cutoff state between the introduction port and the lead-out port;
A fuel cell solenoid valve comprising:
The fuel cell solenoid valve, wherein an axis of the introduction port is offset from an axis of the valve body and is orthogonal to the axis of the valve body. The introduction port is provided on a side portion of the valve body,
2. The fuel cell electromagnetic valve according to claim 1, wherein the lead-out port is provided at a center or a substantially center of a bottom portion of the valve body.   The solenoid valve for a fuel cell according to claim 1 or 2, wherein a plurality of the introduction ports are provided.

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