JP2014066340A - Solenoid valve for fuel cell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve for a fuel cell in which a load applied to a valve element is further reduced to allow the valve element to more smoothly open and close.SOLUTION: A solenoid valve 10 for a fuel cell includes a diaphragm 92 provided between a valve part 98 of a valve element 16 and a valve body 12 configuring a valve mechanism part 18. In the diaphragm 92, an inner edge part 104 is mounted on the valve part 98, and an outer edge part 108 is mounted on a first body 22 of the valve body 12. Setting a pressure receiving area of the valve part 98 to be larger than that of the diaphragm 92 allows pressing force to be almost cancelled when a fuel gas is supplied to a communication chamber 32 in which the valve part 98 and the diaphragm 92 are disposed, to provide a state in which the pressing force is sightly applied only to the valve part 98.

Description

  The present invention relates to a solenoid valve for a fuel cell that is used in, for example, a fuel cell system and can adjust the flow rates of oxygen and hydrogen gas.

  The present applicant has proposed a fuel cell solenoid valve capable of controlling the amount of hydrogen supplied to the anode side in a fuel cell system (see Patent Document 1).

JP 2004-270800 A

  The present invention has been made in connection with the above proposal, and by further reducing the load on the valve body, the valve body can be opened and closed more smoothly, and the durability of the diaphragm is improved. An object of the present invention is to provide an electromagnetic valve for a fuel cell that can be made to operate.

In order to achieve the above object, the present invention includes an introduction passage through which fuel gas is introduced, a lead-out passage through which the fuel gas is led out, and a communication chamber that connects the introduction passage and the lead-out passage. A body that is coupled to the body and is excited under an energization action, a drive part that is displaced along an axial direction under the excitation action of the solenoid part, and a valve seat part of the body that is coupled to the drive part In a solenoid valve for a fuel cell having a valve body that can be freely seated and separated from the
It is formed from a flexible elastic material, is provided between the valve body and the drive unit, bends under the displacement action of the drive unit, and isolates the solenoid unit and the communication chamber. With a diaphragm,
The pressure receiving area of the valve body is set larger than the pressure receiving area of the diaphragm.

  According to the present invention, in an electromagnetic valve for a fuel cell including an introduction passage through which fuel gas is introduced and led out and a body having the lead-out passage, between the drive portion that is displaced under the excitation action of the solenoid portion and the valve body The diaphragm is made of an elastic material having flexibility and is bent under the displacement action of the driving portion, and the pressure receiving area of the valve body is set larger than the pressure receiving area of the diaphragm.

  Therefore, when the fuel gas is introduced into the communication chamber through the introduction passage, the pressing force by the fuel gas applied to the diaphragm can be reduced as compared with the pressing force to the valve body. Therefore, the pressing force applied to the valve body becomes larger than the pressing force applied to the diaphragm, and the pressing force applied to the diaphragm can be offset. As a result, only the difference in pressing force is applied to the valve body. Therefore, the pressing force applied to the valve body is reduced, and the valve body can be smoothly opened and closed with a smaller driving force. In addition, it is possible to improve durability by reducing the load on the diaphragm.

  In addition, a pressing part for sandwiching the diaphragm is provided between the body and the solenoid part, and between the valve body and the driving part, and the pressing part protrudes so as to intersect the displacement direction of the valve body. It is good to provide. As a result, in the communication chamber into which the fuel gas is introduced, the pressure receiving area of the diaphragm can be reduced by the presser, so that the pressure applied to the diaphragm can be reduced compared to the valve body.

  Furthermore, by providing the diaphragm above the valve body, moisture contained in the fuel gas in the communication chamber is difficult to adhere to the diaphragm, and freezing of the diaphragm due to the adhesion of the moisture can be prevented. Therefore, the malfunction of the diaphragm due to the freezing of the moisture can be avoided, and the diaphragm can be operated smoothly together with the valve body.

  Furthermore, it is preferable that one pressing portion provided between the body and the solenoid portion includes an inclined portion that gradually extends downward in a direction away from a member disposed to face the pressing portion. This makes it possible to increase the distance between the body and the member opposed to the inside thereof without increasing the size of the body, and even when moisture contained in the fuel gas adheres as a liquid. Since the moisture can be dropped by the weight of the moisture along the inclined portion, the moisture adhering between the body and the member disposed opposite to the body is kept as it is and is prevented from freezing in a low temperature environment. The

  Furthermore, by setting the diameter of the lower end portion of the presser portion to be larger than the outer peripheral diameter of the valve body, when water that has moved downward along the inclined portion of the presser unit falls, it adheres to the valve body. It is possible to prevent the malfunction of the valve body under a low temperature such as in a cold region caused by the water adhering to the surface and freezing.

  In addition, by having the portion formed in the cross-section arc shape at the end portion of the presser portion, for example, even when the moisture contained in the fuel gas adheres to the body, the moisture is formed by the portion formed in the cross-section arc shape. Since the water is prevented from adhering between the valve body and the body, the valve body is of concern when the water freezes at a low temperature such as in a cold region. It is possible to reliably avoid malfunctions.

  Furthermore, by providing a throttle for reducing the flow rate of the fuel gas in the introduction passage, the flow rate of the fuel gas supplied from the introduction passage to the communication chamber is reduced, and the pressure applied to the valve body and the diaphragm is suppressed. Therefore, durability can be improved by suppressing deformation of the diaphragm.

  Furthermore, the presser portion is provided with a convex portion that protrudes in the displacement direction of the valve body and suppresses deformation of the diaphragm, so that when the diaphragm is deformed along with the displacement of the valve body, the diaphragm is Since the deformation is suppressed by contacting the diaphragm, the load on the diaphragm is reduced and the durability can be improved as compared with the case where the convex portion is not provided.

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

  That is, a diaphragm that is made of a flexible elastic material and is bent under the displacement action of the drive section is provided between the drive section that is displaced under the excitation action of the solenoid section and the valve body. By setting the pressure receiving area of the valve body larger than the pressure receiving area, the fuel gas pressure applied to the diaphragm when the fuel gas is introduced into the communication chamber through the introduction passage is compared with the valve body. Can be reduced. Therefore, the pressing force applied to the valve body becomes larger than the pressing force applied to the diaphragm, and the pressing force applied to the diaphragm can be offset. As a result, only the difference in pressing force is applied to the valve body. Therefore, the pressing force applied to the valve body is reduced, and the valve body can be smoothly opened and closed with a smaller driving force. In addition, it is possible to improve durability by reducing the load on the diaphragm.

1 is an overall cross-sectional view of a fuel cell solenoid valve according to an embodiment of the present invention. It is an expanded sectional view which shows the valve body vicinity in the solenoid valve for fuel cells of FIG. FIG. 5 is a further enlarged cross-sectional view showing the vicinity of the presser portion of the first body in FIG. 2. It is an expanded sectional view which shows the valve body vicinity of the solenoid valve for fuel cells which concerns on a modification.

  DESCRIPTION OF EMBODIMENTS Preferred embodiments of a fuel cell solenoid valve according to the present invention will be described below in detail with reference to the accompanying drawings. In FIG. 1, reference numeral 10 indicates a fuel cell solenoid valve according to an embodiment of the present invention.

  This fuel cell solenoid valve 10 is used in a fuel cell and is provided so that the flow rate of fuel gas (hydrogen) supplied from a pressure control unit (not shown) can be adjusted. As shown in FIG. 1 and FIG. A valve body (body) 12 having a flow path through which fuel gas flows, a solenoid portion 14 connected to an end of the valve body 12, and an axial direction (arrows A and B under the excitation action of the solenoid portion 14) And a valve mechanism portion 18 having a valve body 16 that moves in the direction).

  The valve body 12 is formed of, for example, a metal material, and includes a first body 22 having an introduction port (introduction passage) 20 through which fuel gas is supplied and a discharge port (outlet passage) 26 through which the fuel gas is discharged. And a cylindrical second body 28 connected to the first body 22.

  In the first body 22, the introduction port 20 opened to the side communicates with a communication chamber 32 formed at the center. The introduction port 20 is provided with a throttle portion 34 that throttles the flow rate of the fuel gas to the communication chamber 32. The throttle portion 34 is formed in a plug shape that closes the introduction port 20, and a throttle passage 38 that is reduced in diameter relative to the passage diameter of the introduction port 20 is formed at the center thereof. Then, the fuel gas supplied to the introduction port 20 is throttled by the throttle passage 38 of the throttle unit 34 and flows downstream. A valve seat portion 50 on which the valve body 16 of the valve mechanism portion 18 is seated is formed on the bottom surface of the communication chamber 32.

  In addition, an outlet port 26 that protrudes downward from the substantially central portion is formed at the lower portion of the first body 22, and the upper portion thereof communicates with the communication chamber 32.

  On the other hand, a pressing portion 40 that protrudes radially inward is formed on the upper portion of the first body 22, and the pressing portion 40 has an inclined surface in which the inner peripheral surface facing the communication chamber 32 gradually increases in diameter downward. 42, and a curved portion 44 formed in a circular arc shape with a predetermined radius is formed at a joint portion between the upper surface of the pressing portion 40 and the inclined surface 42. A first annular groove 46 is formed on the upper surface of the first body 22 so as to be annularly depressed on the outer peripheral side of the bending portion 44, and an outer edge portion 108 of a diaphragm 92 described later is attached.

  The 2nd body 28 has the storage chamber 52 penetrated along the vertical direction in the inside, and the valve mechanism part 18 mentioned later is provided in this storage chamber 52. As shown in FIG.

  The solenoid part 14 is provided on the upper part of the valve body 12, and includes a bottomed cylindrical housing 54 and a movable iron core 60 slidably provided on the axis of the housing 54. A coil 56 is wound around the outer peripheral side of the movable iron core 60.

  The housing 54 is formed in a U-shaped cross section from a metal material, for example, and is arranged in a state of opening toward the valve body 12 side (arrow B direction). A fixed core portion 64 into which a later-described movable core 60 is inserted is formed at a substantially central portion of the housing 54, and a coil 56 is provided on the outer peripheral side of the fixed core portion 64, and a side portion of the housing 54 is provided. Is provided with a connector portion 66 electrically connected to the coil 56. Then, power is supplied from the power source to the coil 56 with a connector (not shown) connected to the connector portion 66.

  The movable iron core 60 is formed, for example, in a cylindrical shape from a magnetic material, and is provided inside the housing 54 so as to be displaceable along the axial direction. The movable iron core 60 is guided along the axial direction (the directions of arrows A and B) by making sliding contact with the inner peripheral surface of the fixed iron core portion 64.

  The valve mechanism 18 includes a valve body 16 connected to a lower portion of the movable core 60, a spacer 88 sandwiched between the movable core 60 and the valve body 16, and the spacer 88 and the housing 54. It includes an intervening spring 90 and a diaphragm 92 provided between the valve body 16 and the valve body 12.

  The valve body 16 is formed in a substantially T-shaped cross section, and has a shaft portion 96 that is screwed into a screw hole 94 formed in the lower portion of the movable iron core 60, and a disk-like shape formed at the lower end portion of the shaft portion 96. A valve member 98 is provided, and an annular seat member 100 is attached to the lower end surface of the valve member 98. The valve portion 98 is formed to expand in the radially outward direction with respect to the shaft portion 96, and the seat member 100 is mounted on an end surface facing the valve seat portion 50. The seat member 100 is made of, for example, an elastic material such as rubber, and a portion seated on the valve seat portion 50 protrudes in a direction away from the valve portion 98 (arrow B direction).

  Moreover, the diameter D1 of the valve part 98 is set small with respect to the maximum diameter D2 (lower end diameter of the inclined surface 42) of the pressing part 40 in the 1st body 22, as FIG. 2 shows (D1 <D2). .

  The spacer 88 has a shaft portion 96 of the valve body 16 inserted in the center thereof, and the shaft portion 96 is screwed to the movable iron core 60, whereby the valve portion 98 of the valve body 16 and the movable iron core 60 are connected. Held between.

  The spring 90 is, for example, a coil spring wound in a spiral shape, and is interposed between the flange portion 102 of the spacer 88 and the lower end surface of the housing 54. The spacer 88 and the valve body 16 in contact with the spacer 88 are biased downward (in the direction of arrow B) by the elastic force of the spring 90.

  The diaphragm 92 is made of, for example, an elastic material such as rubber, and has an annular inner edge portion 104 formed on the inner peripheral side, a thin-film skirt portion 106 formed on the outer peripheral side of the inner edge portion 104, and the skirt And an annular outer edge portion 108 formed on the outer peripheral side of the portion 106.

  The inner edge portion 104 is attached to a second annular groove 110 formed on the upper surface of the valve portion 98 of the valve body 16, and is sandwiched between the valve body 16 and the spacer 88, and the outer edge portion 108 is the first edge portion 108. It is attached to a first annular groove 46 formed in the body 22, and is sandwiched between the second body 28 and the pressing portion 40 of the first body 22. Accordingly, the diaphragm 92 is provided so that the inner edge portion 104 can be displaced together with the valve body 16, and the skirt portion 106 is provided flexibly with the outer edge portion 108 fixed to the valve body 12, so that the communication chamber 32 is provided. And the communication between the storage chamber 52 of the second body 28, that is, the communication between the valve body 12 and the solenoid unit 14 is blocked.

  Further, as shown in FIG. 2, the pressure receiving area S1 of the diaphragm 92 is set to be equal to or smaller than the pressure receiving area S2 of the valve body 16 (S1 <S2). That is, the pressure receiving area S2 of the valve portion 98 is set to be equal to or larger than the pressure receiving area S1 of the diaphragm 92. The pressure receiving area S <b> 1 here refers to the area inside the top of the diaphragm 92 which is the highest position of the skirt portion 106, and the pressure receiving area S <b> 2 is the inside of the top of the seat member 100 seated on the valve seat portion 50. Indicates the area.

  The fuel cell solenoid valve 10 according to the embodiment of the present invention is basically configured as described above. Next, the operation, action, and effect thereof will be described. In FIG. 1, the coil 56 is not energized, and the movable iron core 60 is displaced toward the valve seat 50 (in the direction of arrow B) by the elastic force of the spring 90. 16 shows a valve closed state in which the 16 seat members 100 are seated on the valve seat portion 50 and the communication between the introduction port 20 and the outlet port 26 is blocked.

  In such a valve closed state, a power source (not shown) is energized to energize the coil 56 to excite the coil 56, and the movable iron core 60 is attracted to the fixed iron core 64 side by the exciting action.

  Then, the movable iron core 60 is displaced upward (in the direction of arrow A), and accordingly, the valve body 16 connected to the movable iron core 60 rises to be in a valve open state separated from the valve seat portion 50. As a result, the introduction port 20 and the outlet port 26 communicate with each other via the communication chamber 32, and the fuel gas supplied to the introduction port 20 passes through the throttle passage 38 of the throttle portion 34 and then passes through the communication chamber 32. By flowing to the derivation port 26, the derivation port 26 is supplied to another device connected downstream.

  At this time, since the pressure when the fuel gas flows from the introduction port 20 to the communication chamber 32 by passing through the throttle passage 38 is reduced, the pressure load on the diaphragm 92 provided so as to face the communication chamber 32 is reduced. Is reduced.

  On the other hand, the energization of the coil 56 is stopped, and the solenoid portion 14 including the coil 56 is brought into a non-excited state, whereby the attractive force with respect to the movable iron core 60 is extinguished. It is pressed toward the valve seat 50 side (arrow A direction). Then, when the valve body 16 is lowered together with the movable iron core 60, the seat member 100 of the valve body 16 is seated on the valve seat portion 50, and the communication between the introduction port 20 and the outlet port 26 is blocked. A state is reached (see FIG. 1).

  Further, when the moisture contained in the fuel gas adheres to the valve body 12 or the like in the communication chamber 32, for example, the curved portion 44 is provided at the end of the holding portion 40. It can be dropped and eliminated by moving to the inclined surface 42 side along the curved portion 44. For this reason, water droplets adhere between the valve body 12 and the valve body 16 and are prevented from freezing in a low temperature condition such as a cold region, and the malfunction of the valve body 16 due to the freezing is reliably ensured. Can be avoided.

  Furthermore, since the diameter D1 of the valve portion 98 in the valve body 16 is set smaller than the maximum diameter D2 (the lower end diameter of the inclined surface 42) of the presser portion 40 in the first body 22, the inclination of the presser portion 40 is set. Since it is possible to prevent moisture that has fallen downward along the surface 42 from adhering to the valve portion 98, it is possible to prevent moisture from adhering to the valve portion 98 and freezing at a low temperature.

  As described above, in the present embodiment, the diaphragm 92 is disposed above the valve portion 98 that constitutes the valve mechanism portion 18, and is orthogonal to the axial direction (arrow A and B directions) of the first body 22. By holding the outer periphery side of the diaphragm 92 with the protruding presser portion 40, the pressure receiving area S1 of the diaphragm 92 can be reduced with respect to the pressure receiving area S2 of the valve section 98. The pressure (pressing force) applied from the fuel gas to the diaphragm 92 can be reduced relative to the pressure (pressing force) applied to the valve portion 98.

  As a result, the pressing force by the fuel gas is applied in the direction in which the valve body 16 is seated on the valve seat portion 50 (the direction of arrow B), so the spring force of the spring 90 for seating the valve body 16 is set small. Accordingly, it is possible to suppress the driving force of the solenoid unit 14 when the valve body 16 is raised against the elastic force. Therefore, the driving force in the fuel cell electromagnetic valve 10 can be suppressed, and the valve body 16 can be smoothly opened with a smaller driving force.

  The fuel gas introduced into the communication chamber 32 presses the valve portion 98 downward (in the direction of arrow B) and presses the diaphragm 92 upward (in the direction of arrow A). Is set to be larger than the pressure receiving area S1 of the diaphragm 92, the pressing force applied to the valve portion 98 becomes larger than the pressing force applied to the diaphragm 92, thereby canceling the pressing force applied to the diaphragm 92. be able to. As a result, only the difference in the pressing force is applied to the valve body 16, the pressing force applied to the valve body 16 is reduced, and the valve body 16 is opened smoothly with a smaller driving force. Can be made.

  Further, by disposing the diaphragm 92 above the valve portion 98 (in the direction of arrow A), moisture in the communication chamber 32 is difficult to adhere to the diaphragm 92 and is caused by adhesion of the moisture in a low temperature environment such as a cold district. The freezing of the diaphragm 92 can be prevented. As a result, malfunction of the diaphragm 92 due to moisture freezing can be avoided, and the diaphragm 92 can be smoothly operated together with the valve body 16.

  Furthermore, the presser portion 40 of the first body 22 is formed with an inclined surface 42 whose diameter gradually increases as its inner peripheral surface goes downward (in the direction of arrow B). Since it is possible to increase the distance between the valve body 16 and the valve body 16 without increasing the size of the first body 22 and to allow moisture to fall along the inclined surface 42 by its own weight, It is possible to prevent moisture adhering between the valve body 16 and the first body 22 from freezing in a low temperature environment such as a cold region, and to reliably prevent malfunction of the valve body 16. Become.

  Furthermore, the maximum diameter D2 of the presser portion 40, that is, the lower end diameter of the inclined surface 42 is set larger than the diameter D1 of the valve portion 98, thereby moving downward (in the direction of arrow B) along the inclined surface 42. When moisture falls, it is avoided that the moisture adheres to the valve portion 98, and freezing in a low temperature environment such as a cold district caused by the moisture adhesion can be prevented.

  In addition, by forming the curved portion 44 having a circular arc cross section on the inner peripheral side of the presser portion 40, moisture attached to the first body 22 can be suitably guided to the inclined surface 42 by the curved portion 44. The moisture is prevented from adhering to the valve part 98 of the valve body 16, and the moisture adheres between the valve part 98 and the first body 22 and freezes in a low temperature environment such as a cold district. Can be prevented.

  Furthermore, by providing the throttle part 34 in the introduction port 20, the pressure of the fuel gas supplied to the communication chamber 32 is reduced, and accordingly, the pressure applied to the valve body 16 and the diaphragm 92 can be suppressed. Therefore, it is possible to improve the durability by suppressing the deformation of the diaphragm 92, reduce the pressing force against the valve body 16, and smoothly open the valve body 16 with a smaller driving force. Can be made.

  Further, the pressing portion 40 in the first body 22 is not limited to the case where the inner peripheral surface has the inclined surface 42 whose diameter gradually increases downward (in the direction of arrow B) as described above. Like the presser part 122 of the first body 120 shown in FIG. 4, the upper surface has an annular convex part 124 that bulges upward (in the direction of arrow A) in a circular arc shape, and the convex part 124 is You may make it arrange | position so that the skirt part 106 of the diaphragm 92 may be faced. The convex portion 124 is formed in a shape corresponding to the curved shape of the skirt portion 106.

  When the valve body 16 is raised under the excitation action of the solenoid section 14, the skirt section 106 of the diaphragm 92 bends with the displacement of the valve body 16, but is deformed (flexed) by contacting the convex section 124. Therefore, the durability of the diaphragm 92 including the skirt portion 106 can be improved as compared with the case where the convex portion 124 is not provided.

  In addition, the solenoid valve for fuel cells according to the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Solenoid valve for fuel cells 12 ... Valve body 14 ... Solenoid part 16 ... Valve body 18 ... Valve mechanism part 20 ... Introducing port 22, 120 ... First body 26 ... Deriving port 28 ... Second body 32 ... Communication chamber 34 ... Throttle part 40, 122 ... Presser part 42 ... Inclined surface 44 ... Curved part 50 ... Valve seat part 54 ... Housing 60 ... Movable iron core 90 ... Spring 92 ... Diaphragm 98 ... Valve part 100 ... Seat member 102 ... Flange part 104 ... Inner edge 106 ... Skirt part 108 ... Outer edge part 110 ... Second annular groove 124 ... Convex part

Claims (8)

A body having an introduction passage through which fuel gas is introduced, a lead-out passage from which the fuel gas is led out, a communication chamber that communicates the introduction passage and the lead-out passage, and is connected to the body and is energized; A solenoid unit that excites, a drive unit that is displaced along an axial direction under the excitation action of the solenoid unit, and a valve body that is connected to the drive unit and that can be seated and separated from the valve seat unit of the body; In a solenoid valve for a fuel cell having
It is formed from a flexible elastic material, is provided between the valve body and the drive unit, bends under the displacement action of the drive unit, and isolates the solenoid unit and the communication chamber. With a diaphragm,
The solenoid valve for a fuel cell, wherein a pressure receiving area of the valve body is set larger than a pressure receiving area of the diaphragm. The solenoid valve for a fuel cell according to claim 1,
A presser part for sandwiching the diaphragm is provided between the body and the solenoid part, and between the valve body and the drive part, so that the presser part intersects the displacement direction of the valve body. A solenoid valve for a fuel cell, which is provided so as to protrude. The solenoid valve for a fuel cell according to claim 1 or 2,
The electromagnetic valve for a fuel cell, wherein the diaphragm is provided above the valve body. The solenoid valve for a fuel cell according to claim 2,
One holding part provided between the body and the solenoid part includes an inclined part extending in a direction away from a member that is gradually arranged to face the holding part downward. Solenoid valve for fuel cell. The solenoid valve for a fuel cell according to claim 4,
The fuel cell solenoid valve, wherein a diameter of a lower end portion of the pressing portion is set larger than an outer peripheral diameter of the valve body. The fuel cell solenoid valve according to claim 2, 4 or 5,
An electromagnetic valve for a fuel cell, characterized in that an end portion of the pressing portion has a portion formed in an arc shape in cross section. The solenoid valve for a fuel cell according to any one of claims 1 to 6,
An electromagnetic valve for a fuel cell, wherein the introduction passage is provided with a throttle portion for reducing the flow rate of the fuel gas. The solenoid valve for a fuel cell according to claim 2,
The solenoid valve for a fuel cell, wherein the presser portion is provided with a convex portion that protrudes in a displacement direction of the valve body and suppresses deformation of the diaphragm.

Images