JP2013238280A - Valve device for high-pressure tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent fuel gas from leaking to the supply side of fuel gas during charging of the fuel gas.SOLUTION: A valve device 1 for high-pressure tank which can be installed to a high-pressure tank 2 for storing high-pressure fuel gas includes: a gas flow path 10 for allowing fuel gas to flow into the high-pressure tank and to flow out of the high-pressure tank; an inflow path 11 for allowing the fuel gas to flow toward the gas flow path 10 through a fuel gas filling port 13; an outflow path 12 for allowing the fuel gas to flow from the gas flow path 10 toward a fuel gas supply port 14; and a solenoid valve 15 provided in the outflow path 12, the solenoid valve interrupting or permitting the supply of the fuel gas from the inside of the high-pressure tank to the outside of the high-pressure tank. The valve closing pressure of the solenoid valve 15 is larger than the pressure which is received during charging of the fuel gas from the outside of the high-pressure tank to the inside of the high-pressure tank.

Description

  The present invention relates to a valve device for a high-pressure tank.

  Patent Document 1 listed below discloses a valve device for a high-pressure tank that is mounted on a high-pressure tank that is mounted on a fuel cell vehicle and filled with high-pressure fuel gas. In this valve device, by providing a common flow path that is shared by the fuel gas filling to the high-pressure tank and the fuel gas supply to the fuel cell, the fuel gas filling system line and the supply system line are shared, and the parts The number has been reduced.

JP 2009-168166 A

  By the way, in the valve device of Patent Document 1 described above, when the fuel gas is filled, the valve body of the electromagnetic valve in the supply system floats due to the pressure at the time of filling, and the sealing performance against the supply side by the electromagnetic valve is provided. There is a risk that the fuel gas in the high-pressure tank leaks to the supply side.

  The present invention has been made to solve the above-described problems caused by the prior art, and a valve device for a high-pressure tank capable of preventing the fuel gas from leaking to the fuel gas supply side when the fuel gas is filled, and An object is to provide a fuel cell system including the same.

  In order to solve the above-described problems, a valve device for a high-pressure tank according to the present invention is a valve device for a high-pressure tank that can be attached to a high-pressure tank that stores high-pressure fuel gas, and the fuel is contained in the high-pressure tank. A gas flow path for flowing gas into and out of the high-pressure tank; an inflow path for flowing the fuel gas from the fuel gas filling hole toward the gas flow path; An outflow passage for allowing the fuel gas to flow out from the gas passage toward the fuel gas supply hole; and an outflow passage provided in the outflow passage, and the fuel gas from inside the high pressure tank to outside the high pressure tank. An electromagnetic valve that cuts off or allows supply, and a closing pressure of the electromagnetic valve is larger than a pressure received when the fuel gas is filled from outside the high-pressure tank into the high-pressure tank.

  According to the present invention, since the valve closing pressure of the electromagnetic valve can be made larger than the pressure received when the fuel gas is filled, it is possible to prevent the electromagnetic valve from opening when the fuel gas is filled.

  In the valve device for the high-pressure tank, the solenoid valve includes a plunger and a spring that applies a biasing force in a valve closing direction of the plunger, and the fuel gas is filled into the high-pressure tank from outside the high-pressure tank. The cross-sectional area of the plunger may be set so that the pressure applied to the plunger during the operation is smaller than the force that the plunger receives from the spring.

  As a result, since the cross-sectional area of the plunger can be set so that the pressure applied to the plunger during fuel gas filling is smaller than the force received by the plunger from the spring, A situation where the valve is opened can be prevented.

  In the above-described valve device for a high-pressure tank, the plunger may be provided with a groove portion that is notched from the periphery of the plunger toward the central axis. Thereby, it can prevent that a plunger inclines.

  According to the present invention, it is possible to prevent the fuel gas from leaking to the fuel gas supply side when the fuel gas is filled.

It is a block diagram which shows typically the valve apparatus for high pressure tanks in embodiment. (A) is a schematic sectional drawing which shows the solenoid valve of FIG. 1, (B) is a schematic sectional drawing which shows typically the II cross section of the plunger of (A). (A) is a schematic diagram showing an electromagnetic valve in a valve-closed state, (B) is a schematic diagram showing an electromagnetic valve in the middle of a transition from a valve-closed state to a valve-open state, and (C) is a valve-open state. It is a schematic diagram which shows a solenoid valve. It is a figure corresponding to the plunger of FIG.2 (B), and is a schematic sectional drawing which shows typically the cross section of the plunger in a 1st modification. It is a figure corresponding to the plunger of FIG.2 (B), and is a schematic sectional drawing which shows typically the cross section of the plunger in a 2nd modification.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a valve device for a high-pressure tank according to the invention will be described with reference to the accompanying drawings.

  With reference to FIG. 1, the structure of the valve apparatus for high pressure tanks in this embodiment is demonstrated. FIG. 1 is a configuration diagram schematically showing a valve device for a high-pressure tank.

  A valve device 1 for a high-pressure tank is mounted on a high-pressure tank 2 that stores high-pressure fuel gas (hydrogen gas). A valve device 1 for a high-pressure tank includes a gas flow path 10, a gas inflow path 11, a gas outflow path 12, a gas filling hole 13, a gas supply hole 14, an electromagnetic valve 15, and a manual valve 16. , Check valves 17 and 18, and a safety valve 19.

  The gas flow path 10 is a flow path for allowing fuel gas to flow into the high pressure tank 2 and to flow out of the fuel gas from the high pressure tank 2. This gas flow path 10 serves as a common flow path that is shared by filling the high-pressure tank 2 with fuel gas and supplying fuel gas to the fuel cell (not shown) side. A fuel cell is a cell that generates electric power through an electrochemical reaction when supplied with an oxidizing gas and a fuel gas, which are reactive gases, and is mounted on, for example, a fuel cell vehicle.

  A manual valve 16 is provided in the gas flow path 10. The manual valve 16 is a manual valve for blocking outflow of fuel gas at the time of inspection or the like. The gas flow path 10 is connected to a flow path connected to the safety valve 19. The safety valve 19 is a valve that is opened when the temperature in the high-pressure tank 2 rises above a predetermined temperature.

  The gas filling hole 13 is connected to a filling flow path for allowing fuel gas flowing in from a filling means (not shown) to flow into the high-pressure tank 2 side. A fuel supply channel for supplying the fuel gas stored in the high-pressure tank 2 to the fuel cell side is connected to the gas supply hole 14.

  The gas inflow channel 11 is a channel for allowing fuel gas to flow from the gas filling hole 13 toward the gas channel 10. The gas inflow channel 11 is provided with check valves 17 and 18. The check valves 17 and 18 are valves for preventing the fuel gas from flowing backward from the inside of the high-pressure tank 2 toward the outside of the high-pressure tank 2.

  The gas outflow passage 12 is a passage for causing the fuel gas to flow out from the gas passage 10 toward the gas supply hole 14. An electromagnetic valve 15 is provided in the gas outflow passage 12. The electromagnetic valve 15 is a valve that blocks or allows the supply of fuel gas from the high-pressure tank 2 to the outside of the high-pressure tank 2.

  The configuration of the electromagnetic valve 15 will be described with reference to FIG. FIG. 2A is a schematic cross-sectional view of the electromagnetic valve 15, and FIG. 2B is a view schematically showing a II cross section of the plunger 151 shown in FIG. 2A.

  The solenoid valve 15 includes a sleeve 150, a plunger 151, a poppet 152, a poppet seating portion 155, a spring 154, a ball 153, a ball seating portion 158, an inflow hole 156 on the high-pressure tank 2, and a fuel cell side. The outflow hole 157 and an electromagnet (solenoid coil) 159 are included.

  Plunger 151 and poppet 152 are accommodated in sleeve 150 so as to be movable in the axial direction. A ball 153 is fixed to the plunger 151, and a biasing force of a spring 154 acts on the ball 153. Therefore, the urging force of the spring 154 acts on the plunger 151 via the ball 153 in the valve closing direction. Further, the urging force of the spring 154 acts on the poppet 152 via the ball 153 and the ball seating portion 158 in the valve closing direction.

  The solenoid valve 15 is opened and closed by the plunger 151 and the poppet 152 moving in the axial direction. The plunger 151 is moved using the electromagnetic force generated by the electromagnet 159. Specifically, the plunger 151 is moved by controlling the voltage applied to the electromagnet 159 from a drive source (not shown).

  Here, as shown in FIG. 2 (B), the plunger 151 in the present embodiment has a cross-sectional shape perpendicular to the axis thereof, in which a part of a circle is cut into a D-cut shape. A gap can be provided between the plunger 151 and the sleeve 150 by forming this D-cut portion (hereinafter referred to as “D-cut portion”). The gap between the plunger 151 and the sleeve 150 will be described later.

  With reference to FIG. 3, a mechanism for controlling the valve closing state and the valve opening state of the electromagnetic valve 15 using the electromagnetic force by the electromagnet 159 will be described. 3A is a schematic diagram showing the electromagnetic valve 15 in the closed state, and FIG. 3B is a schematic diagram showing the electromagnetic valve 15 in the middle of the transition from the closed state to the open state. (C) is a schematic diagram showing the solenoid valve 15 in a valve open state.

  As shown in FIG. 3A, when no voltage is applied to the electromagnet 159, the tip of the poppet 152 is pressed against the poppet seating portion 155 by the urging force of the spring 154 acting in the valve closing direction. The valve is closed. When the valve is closed, there is a gap between the poppet 152 and the poppet support 151a of the plunger 151.

  As shown in FIG. 3B, when application of voltage to the electromagnet 159 is started, the electromagnetic force of the electromagnet 159 starts to act in the valve opening direction of the plunger 151. When the force acting in the valve opening direction of the plunger 151 exceeds the force acting in the valve closing direction of the plunger 151 by the bias of the spring 154, the movement of the plunger 151 in the valve opening direction starts. Until the plunger 151 moves in the valve opening direction by the gap between the poppet 152 and the poppet support portion 151a, the tip of the poppet 152 remains in contact with the poppet seating portion 155, and the closed state of the poppet 152 is maintained. . At this time, the ball 153 is detached from the ball seating portion 158, and the fuel gas from the high pressure tank 2 side flows into the outflow hole 157.

  Thus, after the pressure difference between the high-pressure tank 2 side and the fuel cell side is reduced, the poppet 152 can be pulled up to open the solenoid valve 15.

  As shown in FIG. 3C, the poppet 152 supported by the poppet support portion 151a of the plunger 151 moves integrally with the plunger 151 in the valve opening direction. Thereby, the tip of the poppet 152 is separated from the poppet seating portion 155, and the electromagnetic valve 15 is opened.

  Here, the electromagnetic valve 15 maintains the closed state by using the biasing force of the spring 154. Therefore, when a large pressure is applied from the high-pressure tank 2 side to the solenoid valve 15 in the closed state when the fuel gas is charged, the closed state cannot be maintained by the urging force of the spring 154, and the fuel gas is not supplied to the fuel cell. May leak to the side. If such a phenomenon is repeated, there is a risk that problems such as shortening the life of the electromagnetic valve 15 may occur.

  Therefore, in the electromagnetic valve 15 in the present embodiment, the gap provided between the plunger 151 and the sleeve 150 is increased by increasing the area of the D-cut portion. By increasing this gap, the fuel gas from the high-pressure tank 2 side is removed even if the plunger 151 is pushed up in the valve opening direction as shown in FIG. By acting on the upper end surface of the plunger 151, it is possible to maintain the valve closed state and to prevent leakage to the fuel cell side.

  On the other hand, if the area of the D-cut portion is increased too much, the lines of magnetic force are reduced, so that the attractive force is reduced. Therefore, it is desirable to adjust the area of the D-cut portion so that the leakage to the fuel cell side is prevented and the fall of the suction force can be prevented.

  When the inventors of the present application tried an experiment, when the ratio of the area of the D-cut portion to the cross-sectional area of the substantially circular plunger that does not form the D-cut portion is 0.3%, leakage occurs and 2.8%. Sometimes it was found that no leaks occurred. On the other hand, when the ratio is 2.8%, it has been found that the lines of magnetic force decrease and the attractive force decreases. Considering these results, it is preferable to adjust the area of the D-cut portion so that the ratio is around 2%.

  As described above, according to the valve device 1 for a high-pressure tank in the embodiment, the pressure applied to the plunger 151 when the fuel gas is filled is smaller than the force that the plunger 151 receives from the spring 154. Since the cross-sectional area can be set, it is possible to prevent the electromagnetic valve 15 from being opened by the pressure applied to the plunger 151 when the fuel gas is filled. Therefore, it is possible to prevent the fuel gas from leaking to the fuel gas supply side when the fuel gas is filled.

  In the embodiment described above, the case where the cross-sectional shape of the plunger is a shape obtained by scraping a part of a circle into a D-cut shape as shown in FIG. The shape is not limited to this. Other shapes may be used as long as the cross-sectional area of the plunger can be set so that the pressure applied to the plunger during the fuel gas filling is smaller than the force received by the plunger from the spring.

  For example, as shown in FIG. 4, the cross-sectional shape of the plunger may be a shape in which a part of a circle is cut out in a concave shape from its peripheral edge toward the center. That is, it is good also as forming the groove part notched toward the central-axis direction from the periphery of the plunger 151 in the side surface of the plunger 151. FIG.

  By making the shape cut into a concave shape, it is possible to reduce the possibility that the plunger is inclined in the sleeve as compared with the shape cut into a D-cut shape. When the plunger is inclined, the distribution around the surface of the resin seal becomes a factor. Therefore, by making the shape cut into a concave shape, the inclination of the plunger can be suppressed and the sealing performance can be ensured.

  Moreover, as shown in FIG. 5, it is good also as forming a through-hole, without forming D cut part and a groove part in the plunger 151. FIG.

  Moreover, in embodiment mentioned above, although the leak to the fuel cell side is prevented by adjusting the cross-sectional area of a plunger, the method of preventing a leak is not limited to this. Other methods may be used as long as the valve closing pressure of the solenoid valve can be made larger than the pressure received when the fuel gas is charged. For example, the biasing force of the spring may be adjusted so as to be larger than the pressure received when the fuel gas is charged.

DESCRIPTION OF SYMBOLS 1 ... Valve apparatus for high pressure tanks, 2 ... High pressure tank, 10 ... Gas flow path, 11 ... Gas inflow path, 12 ... Gas outflow path, 13 ... Gas filling hole, 14 ... Gas supply hole, 15 ... Solenoid valve , 16 ... Manual valve, 17, 18 ... Check valve, 19 ... Safety valve, 150 ... Sleeve, 151 ... Plunger, 151a ... Plunger poppet support, 152 ... Poppet, 153 ... Ball, 154 ... Spring, 155 ... Poppet seating 156 ... inflow hole, 157 ... outflow hole, 158 ... ball seating part, 159 ... electromagnet.

Claims (3)

A valve device for a high-pressure tank that can be attached to a high-pressure tank that stores high-pressure fuel gas,
A gas flow path for allowing the fuel gas to flow into the high-pressure tank and for allowing the fuel gas to flow out of the high-pressure tank;
An inflow channel for allowing the fuel gas to flow from the filling hole of the fuel gas toward the gas channel;
An outflow channel for flowing out the fuel gas from the gas channel toward the fuel gas supply hole;
An electromagnetic valve that is provided in the outflow passage and shuts off or allows the supply of the fuel gas from the high-pressure tank to the outside of the high-pressure tank;
With
A valve device for a high-pressure tank, wherein a closing pressure of the electromagnetic valve is larger than a pressure received when the fuel gas is filled from outside the high-pressure tank into the high-pressure tank. The electromagnetic valve includes a plunger and a spring that applies a biasing force in a valve closing direction of the plunger,
The cross-sectional area of the plunger is set so that the pressure applied to the plunger when the fuel gas is filled into the high-pressure tank from outside the high-pressure tank is smaller than the force that the plunger receives from the spring. The valve device for a high-pressure tank according to claim 1, wherein   3. The valve device for a high-pressure tank according to claim 2, wherein the plunger is provided with a groove part cut out from a peripheral edge of the plunger toward a central axis direction.

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