JP5952151B2 - Solenoid valve for fuel cell - Google Patents

Description

  The present invention relates to an electromagnetic valve for a fuel cell that is used in, for example, a fuel cell system and can adjust the flow rate of fuel gas such as 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 prevents the clogging due to freezing by preventing the moisture generated inside the body from adhering to the filter, thereby allowing the fuel gas to flow smoothly. An object of the present invention is to provide a solenoid valve for a fuel cell that can be used.

In order to achieve the above-mentioned object, the present invention provides a communication system that connects an introduction passage into which a fuel gas is introduced and a filter is attached, a lead-out passage from which the fuel gas is led out, and the introduction passage and the lead-out passage. A body having a chamber, a solenoid unit coupled to the body and energized under energization, a drive unit displaced along an axial direction under the energization of the solenoid unit, and the body coupled to the drive unit A fuel cell electromagnetic valve having a valve body that can be freely seated and separated from the valve seat portion of
In the communication chamber, the connection portion of the introduction passage is disposed above the bottom portion of the communication chamber.

  According to the present invention, in the solenoid valve for a fuel cell, the body having the introduction passage into which the fuel gas is introduced is provided with a filter in the introduction passage and includes a communication chamber in communication with the introduction passage. The connecting portion of the introduction passage in the chamber is arranged to be above the bottom of the communication chamber.

  Therefore, when the moisture contained in the fuel gas moves from the introduction passage to the communication chamber and begins to accumulate in the communication chamber, the moisture begins to accumulate from the bottom of the communication chamber, so that the moisture enters the bottom. On the other hand, it is prevented from entering the side of the introduction passage disposed above. As a result, it is possible to reliably prevent moisture from adhering to the filter of the introduction passage and clogging due to freezing in a low temperature environment such as a cold region, and to smoothly fuel gas even in a low temperature environment. It can be distributed.

  In addition, the communication chamber is formed with the largest diameter at the bottom, so that even when water contained in the fuel gas starts to accumulate from the bottom of the communication chamber, the water is formed at the bottom having a large diameter and a large volume. Therefore, it is possible to prevent the moisture from entering from the communication chamber into the introduction passage. As a result, it is possible to prevent clogging due to moisture adhering to the filter and freezing.

  Furthermore, by providing the valve seat portion at a position below the connection portion of the introduction passage, moisture accumulated in the communication chamber is lowered with respect to the introduction passage before reaching the introduction passage. Since the water is discharged to the lead-out passage side through the valve seat portion formed in the above, it is possible to surely prevent the moisture from entering the introduction passage side and to prevent the moisture from adhering to the filter.

  Furthermore, even if water is accumulated at the bottom of the introduction passage by providing a restriction portion for restricting the flow rate of the fuel gas in the introduction passage and disposing the restriction portion above the bottom of the introduction passage. It is preferable that the moisture does not hinder the flow of the fuel gas in the throttle portion.

  Still further, the introduction passage has an inclined portion that is inclined so as to expand in the direction away from the filter, thereby guiding moisture near the filter downward along the inclined portion. Since it can be discharged to the bottom, it is possible to prevent water from being collected in the vicinity of the filter, and to prevent clogging due to the water adhering to the filter and freezing.

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

  That is, the body having an introduction passage into which fuel gas is introduced is provided with a filter in the introduction passage, and is provided with a communication chamber communicating with the introduction passage, and a connection portion of the introduction passage in the communication chamber is provided. Even if the moisture contained in the fuel gas moves from the introduction passage to the communication chamber and starts to accumulate from the bottom of the communication chamber, it is disposed with respect to the bottom. Thus, the moisture can be prevented from entering the introduction passage disposed above. As a result, it is possible to reliably prevent moisture from adhering to the filter of the introduction passage and causing clogging due to freezing in a low temperature environment such as a cold region, and smoothing the fuel gas even in the low temperature environment. It becomes possible to distribute to.

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. 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 has a first body 22 having an introduction passage 20 to which fuel gas is supplied, and a lead-out that is connected to the first body 22 and discharges the fuel gas. And a second body 26 having a passage 24.

  The first body 22 has an introduction passage 20 that opens to the side, and the introduction passage 20 penetrates in the horizontal direction and communicates with a communication chamber 30 formed at the outside and the center of the first body 22. doing.

  The introduction passage 20 is formed with a large diameter on the inlet 20a side to which the fuel gas is supplied and a small diameter on the outlet 20b side which is the communication chamber 30 side, and the flow rate of the fuel gas to the communication chamber 30 is reduced on the inlet 20a side. A throttle portion 32 is provided, and a filter 34 for removing dust and the like contained in the fuel gas is provided on the outlet 20b side. In addition, an inclined portion 36 that gradually increases in diameter toward the inlet 20a is formed at a substantially intermediate portion along the longitudinal direction of the introduction passage 20. That is, the introduction passage 20 is formed so that the passage diameter gradually increases from the outlet 20b side to the inlet 20a side at the substantially intermediate portion thereof.

  The throttle portion 32 is formed, for example, in a plug shape that closes the introduction passage 20, and a throttle passage 38 that is reduced in diameter relative to the passage diameter of the introduction passage 20 is formed in the center thereof. Then, after the fuel gas supplied to the introduction passage 20 is throttled by the throttle passage 38 of the throttle portion 32, it flows to the downstream side where the filter 34 is provided.

  The filter 34 is formed of, for example, a net-like bottomed cylindrical body, and is disposed so that the opening thereof is on the side of the throttle portion 32. When the fuel gas passes through the filter 34, dust in the fuel gas is removed. Remove by catching.

  The second body 26 includes a cylindrical portion 44 extending in the vertical direction (the directions of arrows A and B), and a flange portion 46 that protrudes radially outward from the outer peripheral surface of the cylindrical portion 44. Is provided with a lead-out passage 24 penetrating along the axial direction, and the communication chamber 30 of the first body 22 communicates with the outside through the lead-out passage 24. Then, the flange portion 46 is integrally connected by a bolt or the like (not shown) in a state where the flange portion 46 is in contact with the lower surface of the first body 22.

  Further, an annular valve seat portion 48 on which the valve body 16 of the valve mechanism portion 18 is seated is formed at the upper end portion of the cylindrical portion 44.

  The communication chamber 30 is formed by being surrounded by the cylindrical portion 44 of the second body 26, the flange portion 46 and the inner peripheral surface of the first body 22, and is connected to the second body 26 side (in the direction of arrow B). A diameter-expanded portion 52 that is expanded in the radially outward direction is formed on the inner peripheral surface. As shown in FIG. 2, the diameter D1 of the bottom 54 of the communication chamber 30 surrounded by the enlarged diameter portion 52, the cylindrical portion 44, and the flange portion 46 is larger than the inner peripheral diameter D2 of the first body 22. The outlet 20b of the introduction passage 20 is connected to a position that is formed (D1> D2) and is above (in the direction of arrow A) with respect to the bottom 54.

  The solenoid portion 14 is provided on the upper portion of the valve body 12 and includes a bottomed cylindrical housing 56 and a movable iron core 62 that is slidably provided on the axis of the housing 56.

  The housing 56 is formed in a U-shaped cross section from a metal material, for example, and is arranged in an open state toward the valve body 12 side (arrow B direction). A fixed core portion 66 into which a later-described movable iron core 62 is inserted is formed at a substantially central portion of the housing 56, and a coil 58 is wound around and stored in the outer peripheral side of the fixed core portion 66. A connector portion 68 that is electrically connected to the coil 58 is provided on a side portion of the housing 56. Then, power is supplied from the power source to the coil 58 with a connector (not shown) connected to the connector portion 68.

  The movable iron core 62 is formed, for example, in a cylindrical shape from a magnetic material, and is provided inside the housing 56 so as to be displaceable along the axial direction. The movable iron core 62 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 66.

  The valve mechanism portion 18 includes a valve body 16 formed at the lower part of the movable iron core 62 and a spring 90 interposed between the valve body 16 and the housing 56.

  The valve body 16 has a disc-shaped valve portion 96 whose diameter is increased radially outward with respect to the lower end portion of the movable iron core 62, and an annular seat member 98 is attached to the lower end surface of the valve portion 96. The seat member 98 is made of, for example, an elastic material such as rubber, and a portion seated on the valve seat portion 48 protrudes in a direction away from the valve portion 96 (arrow B direction).

  The spring 90 is, for example, a coil spring wound spirally, and is interposed between the valve portion 96 of the valve body 16 and the end surface of the housing 56. Then, the valve body 16 is urged downward (in the direction of arrow B) by the elastic force of the spring 90.

  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 58 is not energized, and the movable iron core 62 is displaced toward the valve seat 48 (in the direction of arrow B) by the elastic force of the spring 90, so that the valve body 16 shows a valve closed state in which the 16 seat members 98 are seated on the valve seat portion 48 and the communication between the introduction passage 20 and the discharge passage 24 is blocked.

  In such a valve closed state, a power source (not shown) is energized to energize the coil 58 to excite the coil 58, and the movable iron core 62 is attracted to the fixed iron core 66 side by the exciting action.

  Then, the movable iron core 62 is displaced upward (in the direction of arrow A), and accordingly, the valve body 16 connected to the movable iron core 62 rises to be in a valve open state separated from the valve seat portion 48. Thereby, the introduction passage 20 and the outlet passage 24 communicate with each other through the communication chamber 30, and the fuel gas supplied to the introduction passage 20 passes through the throttle passage 38 and the filter 34 of the throttle portion 32, and then the communication chamber. By flowing through the outlet passage 24 through 30, it is supplied from the outlet passage 24 to another device connected downstream.

  At this time, the moisture contained in the fuel gas may move from the introduction passage 20 to the communication chamber 30 and accumulate in the communication chamber 30 in a liquid state. Even in such a case, moisture begins to accumulate from the bottom portion 54 of the communication chamber 30, and the bottom portion 54 is formed larger than the upper side of the communication chamber 30, so that the bottom portion having a large volume is formed. Accumulation on the 54 side prevents the moisture from entering the introduction passage 20 side. As a result, moisture adheres to the filter 34 in the introduction passage 20 and is prevented from being clogged due to freezing in a low temperature environment such as a cold district. As a result, the fuel gas can be smoothly circulated by the fuel cell solenoid valve 10 even in a low temperature environment such as a cold region.

  In addition, the vicinity of the bottom 54 of the communication chamber 30 has a diameter-enlarged portion 52 in which the inner peripheral surface of the first body 22 is expanded, so that the water accumulated in the bottom 54 is expanded in a stepped shape. Since the upward movement is suppressed by the diameter portion 52 and movement toward the introduction passage 20 side can be prevented, clogging caused by freezing at a low temperature by preventing adhesion to the filter 34 in the introduction passage 20. Can be reliably prevented.

  Further, by arranging the throttle passage 38 of the throttle portion 32 at a higher position (above) with respect to the bottom side of the introduction passage 20, even when moisture accumulated near the filter 34 is guided to the bottom portion, This is preferable without obstructing the flow of the fuel gas in the throttle passage 38.

  Furthermore, by providing the inclined portion 36 in the introduction passage 20, moisture near the filter 34 can be guided downward (in the direction of arrow B) along the inclined portion 36 and discharged to the bottom. As a result, the accumulation of moisture in the vicinity of the filter 34 is prevented, and the moisture is prevented from freezing while attached to the filter 34.

  Further, like the fuel cell solenoid valve 120 according to the modification shown in FIG. 3, the valve seat portion 124 in the second body 122 is positioned downward (in the direction of arrow B) with respect to the outlet 20 b side of the introduction passage 20. Since the water accumulated in the bottom portion 54 of the communication chamber 30 can be discharged to the outlet passage 24 side through the inside of the valve seat portion 124 formed lower (downward) than the introduction passage 20. The moisture can be reliably prevented from entering the side of the introduction passage 20 and adhering to the filter 34. As a result, the water adhering to the filter 34 is reliably prevented from freezing and clogging at a low temperature.

  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, 120 ... Solenoid valve for fuel cells 12 ... Valve body 14 ... Solenoid part 16 ... Valve body 18 ... Valve mechanism part 20 ... Introducing passage 22 ... First body 24 ... Outlet passage 26, 122 ... Second body 30 ... Communication room 32 ... Restriction part 34 ... Filter 36 ... Inclination part 38 ... Restriction passage 48, 124 ... Valve seat part 52 ... Diameter expansion part 54 ... Bottom part 96 ... Valve part

Claims (5)

A body having an introduction passage into which a fuel gas is introduced and a filter is mounted; a lead-out passage from which the fuel gas is led out; a communication chamber that connects the introduction passage and the lead-out passage; and a body connected to the body A solenoid part that is excited under an energization action, a drive part that is displaced along the axial direction under the excitation action of the solenoid part, and a seat that is connected to the drive part and that can be seated and separated from the valve seat part of the body A solenoid valve for a fuel cell having a valve body,
In the communication chamber, the connecting portion of the introduction passage is disposed above the bottom portion of the communication chamber. The solenoid valve for a fuel cell according to claim 1,
The solenoid valve for a fuel cell, wherein the communication chamber is formed with the largest diameter at the bottom. The solenoid valve for a fuel cell according to claim 1 or 2,
The solenoid valve for a fuel cell, wherein the valve seat portion is provided at a position below the connection portion of the introduction passage. The solenoid valve for a fuel cell according to claim 3,
An electromagnetic valve for a fuel cell, wherein the introduction passage is provided with a restriction portion for restricting the flow rate of the fuel gas, and the restriction portion is disposed above the bottom portion of the introduction passage. The solenoid valve for a fuel cell according to claim 4,
The fuel cell solenoid valve, wherein the introduction passage has an inclined portion that is inclined so as to expand in a direction away from the filter.

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