JP2017126269A - Pressure control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a seal member from deteriorating or damaging as pressure of a high-pressure gas can be suppressed from acting on the seal member.SOLUTION: A pressure control valve 1 has a housing 10, pressure control chambers 21, 22 formed in the housing 10, a piston 15 capable of moving axially in the housing 10, a valve 14 operating integrally with the piston 15, a seat 12 where the valve 14 can be seated, a spring 16 energizing the piston 15 in a valve opening direction, and gaskets 41, 44 provided at an outer periphery of the piston 15. The pressure control valve further has a relief valve 18 controlling the pressure in the pressure control chambers 21, 22 to a predetermined value or less, and is provided with a constriction part 52 downstream from the relief valve 18.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pressure adjustment valve that reduces the pressure of a high-pressure gaseous fuel to adjust it to a desired pressure.

  As a prior art, there is a pressure regulating valve as disclosed in Patent Document 1. The pressure regulating valve includes a housing, a fluid passage formed in the housing, a piston capable of moving in a pressure adjusting chamber formed in the fluid passage in an axial direction, and a spring for biasing the piston in a valve opening direction. And a valve that operates integrally with the piston, and a valve seat on which the valve can be seated. A seal member is disposed on the outer periphery of the piston.

Special table 2010-533268 gazette

  However, in the pressure regulating valve described above, it takes a certain time until the pressure in the pressure regulation chamber reaches a predetermined value (pressure regulation value) after the high pressure gas is supplied. Therefore, the pressure of the high pressure gas acts on the seal member until the pressure in the pressure adjustment chamber reaches the pressure adjustment value, that is, until the valve is closed, and thus the seal member may be deteriorated. Further, when the piston is fixed in the valve open state or when a foreign object is caught, the pressure in the pressure regulating chamber increases, so that the seal member may be damaged.

  Therefore, the present invention has been made to solve the above-described problems, and by preventing the pressure of the high-pressure gas from acting on the seal member, the seal member can be prevented from being deteriorated or damaged. An object of the present invention is to provide a pressure regulating valve that can be used.

  One form of the present invention made to solve the above problems is a housing, a pressure regulating chamber formed in the housing, a piston movable in the axial direction in the housing, and an operation integrally with the piston. In the pressure regulating valve, the pressure regulating valve includes: a valve body that is capable of seating; a valve seat on which the valve body can be seated; a spring that biases the piston in a valve opening direction; and a seal member provided on an outer periphery of the piston It has a relief valve for adjusting the pressure in the room to a predetermined value or less, and a throttle part is provided on the downstream side of the relief valve.

  In this pressure regulating valve, since the throttle portion is provided, the pressure in the pressure regulating chamber can be quickly set to a predetermined value. Thereby, since the time until it becomes a valve closing state is shortened, it can suppress that the pressure of a high pressure gas acts on a sealing member. Therefore, deterioration of the seal member can be prevented.

Here, when the piston is stuck in the valve open state or when a foreign object is caught, the high pressure gas continues to flow, so the pressure in the pressure regulating chamber rises. There is a risk of damage to parts and piping connected downstream.
However, in this pressure adjusting valve, the pressure in the fluid passage is adjusted to a predetermined value or less by the relief valve. Therefore, even when the piston is stuck in the valve open state or when foreign matter is caught, the pressure in the pressure regulating chamber does not exceed a predetermined value, so that the seal member can be prevented from being damaged. At the same time, it is possible to prevent damage to parts and piping connected to the downstream side of the pressure regulating valve.

  In the pressure regulating valve described above, it is desirable that the relief valve is provided integrally with the housing.

  By adopting such a configuration, the pressure regulating valve can be reduced in size and can be arranged even in a limited space.

  According to the pressure regulating valve of the present invention, it is possible to prevent the pressure of the high-pressure gas from acting on the seal member, thereby preventing deterioration and damage of the seal member.

It is a whole sectional view of a pressure regulation valve concerning an embodiment. It is an expanded sectional view which shows the cross section of the aperture | diaphragm | squeeze part in the AA line of FIG.

A pressure regulating valve according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.
In the following description, the “upstream side” is the upstream side in the flow direction of the fuel gas G, and the “downstream side” is the downstream side in the flow direction of the fuel gas G.

  The pressure adjustment valve 1 is a valve that adjusts the fuel gas G to a desired pressure while reducing the pressure. The fuel gas G is, for example, hydrogen gas supplied to a vehicle fuel cell (not shown). A main stop valve (not shown) for supplying or stopping the fuel gas G stored in a fuel tank (not shown) is connected to the upstream side of the pressure regulating valve 1. Further, an injector (not shown) for supplying the fuel gas G to the fuel cell is connected to the downstream side of the pressure regulating valve 1.

  As shown in FIG. 1, the pressure regulating valve 1 includes a housing 10, a seat 12, a valve 14, a piston 15, a spring 16, a relief valve 18, a leak check port 19, and the like. The housing 10 includes an inlet block member 11, a body member 13, and an outlet block member 17. A first pressure regulating chamber 21 is formed inside the body member 13. A second pressure regulating chamber 22 is formed so as to be partitioned into the body member 13, the piston 15, and the outlet block member 17.

  The inlet block member 11 includes an inlet 31 and an inlet passage 32. The inlet 31 is an inlet for the fuel gas G to the pressure regulating valve 1. The inlet passage 32 is a passage communicating with the inlet 31 and the sheet hole 33 of the sheet 12. A filter 34 that removes foreign matter in the fuel gas G is disposed in the inlet passage 32. Further, a bush 35 is disposed between the filter 34 and the sheet 12.

  The sheet 12 is made of resin, and is held between the inlet block member 11 and the body member 13 in a state where the sheet 12 is crushed by a predetermined amount. The sheet 12 is formed in a substantially annular shape. The sheet 12 includes a sheet hole 33 that communicates with the inlet passage 32 and the first pressure regulating chamber 21.

  The body member 13 is a housing of the pressure regulating valve 1 and accommodates a part of the valve 14, the piston 15, the spring 16, and the outlet block member 17 inside thereof.

  The valve 14 is disposed in the first pressure regulating chamber 21 on the downstream side of the seat 12. The valve 14 moves in the first pressure regulating chamber 21 and abuts and separates from the seat 12 to block and allow the flow of the fuel gas G. That is, the valve 14 opens and closes a flow path communicating with the seat hole 33 of the seat 12 and the first pressure regulating chamber 21. The valve 14 is attached to the piston 15 at the end 43 of the piston 15 and is integrated with the piston 15. The material of the valve 14 is metal (for example, stainless steel).

  The piston 15 includes a main body portion 36, a shaft-shaped portion 37, a passage 38, and the like. The main body 36 is formed in a cylindrical shape. The main body portion 36 is disposed at a downstream position with respect to the shaft-shaped portion 37. The main body 36 is provided with a spring seat 39 (contact portion with the spring 16) with which the spring 16 abuts on the surface on the spring 16 side. A packing 41 as a seal member is disposed on the outer peripheral surface of the main body 36.

  The shaft portion 37 is formed in a cylindrical shape. The shaft portion 37 is disposed at a position upstream of the main body portion 36. The shaft portion 37 includes an inflow hole 42. The passage 38 is formed in the direction of the central axis of the piston 15. Further, the valve 14 is disposed at the end portion 43 on the upstream side (the seat 12 side) of the shaft-shaped portion 37. In this way, the piston 15 is integrated with the valve 14, and the valve 14 is brought into contact with and separated from the seat 12. A packing 44 as a seal member is disposed on the outer peripheral surface of the shaft-shaped portion 37. The material of the piston 15 is a metal (for example, aluminum).

  The spring 16 is disposed between the body member 13 and the piston 15. The spring 16 biases the piston 15 toward the outlet block member 17, that is, in the valve opening direction of the valve 14.

  The outlet block member 17 includes an outlet 51. The outlet 51 is an outlet for the fuel gas G from the pressure regulating valve 1. A relief valve 18 is integrally provided on the outlet block member 17 (housing 10). Thereby, even when the relief valve 18 is provided, the pressure regulating valve 1 can be downsized. Therefore, the pressure regulating valve 1 can be arranged in a limited space such as in a vehicle. The relief valve 18 adjusts the pressure of the fuel gas G in the second pressure regulating chamber 22 (passage 38) to a predetermined set value or less. The outlet block member 17 is provided with a leak check port 19.

  Further, the outlet block member 17 is formed with a throttle portion 52. That is, the throttle portion 52 is provided in the housing 10. The throttle 52 is provided on the downstream side of the relief valve 18. For example, as shown in FIG. 2, the narrowed portion 52 can be constituted by four pores 53 that are arranged evenly (every 90 °) on the same circumference indicated by a one-dot chain line. With these four pores 53, the flow passage cross-sectional area is made smaller in the throttle portion 52 than in other portions.

  The first pressure regulating chamber 21 is formed at a downstream position with respect to the sheet 12. The first pressure regulating chamber 21 communicates with the inlet 31 of the inlet block member 11 when the valve 14 is separated from the seat 12. The second pressure regulating chamber 22 is formed at a position downstream of the piston 15. The second pressure regulating chamber 22 is formed so as to be partitioned into the body member 13, the piston 15, and the outlet block member 17. In the first pressure regulating chamber 21 and the second pressure regulating chamber 22, the pressure of the fuel gas G is adjusted.

  Next, the operation (operation method) of the pressure regulating valve 1 of the present embodiment will be described. As shown in FIG. 1, for example, when the supply of the fuel gas G to the vehicle fuel cell is started and the fuel gas G flows out from the outlet 51 in the direction of the arrow (in the direction of the central axis of the piston), the second pressure regulation The pressure of the fuel gas G stored in the chamber 22 decreases. Therefore, the piston 15 moves toward the outlet block member 17 by the biasing force of the spring 16, so that the valve 14 integrated with the piston 15 is separated from the seat 12. Then, the high-pressure fuel gas G supplied from the fuel tank flows through the inlet 31, the inlet passage 32 and the seat hole 33 of the seat 12 and flows into the first pressure regulating chamber 21. Further, the fuel gas G that has flowed into the first pressure regulating chamber 21 flows into the second pressure regulating chamber 22 through the inlet hole 42 and the passage 38 of the piston 15.

  When the pressure of the fuel gas G in the second pressure regulating chamber 22 increases and the force acting on the piston 15 due to the pressure of the fuel gas G becomes greater than the biasing force of the spring 16, the piston 15 is attached to the spring 16. It moves toward the seat 12 against the force. Then, the valve 14 integrated with the piston 15 comes into contact with the seat 12, and the flow of the fuel gas G into the first pressure regulating chamber 21 and the second pressure regulating chamber 22 is stopped. In this way, the pressure of the fuel gas G in the first pressure regulating chamber 21 and the second pressure regulating chamber 22 is maintained at a predetermined value (pressure regulation value). Specifically, the pressure in the first pressure regulating chamber 21 and the second pressure regulating chamber 22 is set to the area obtained by subtracting the area S2 of the diameter sealed by the packing 44 from the area S1 of the diameter sealed by the packing 41. The pressure is roughly regulated so that the force obtained by multiplying the pressure in the pressure regulating chamber 22 becomes equal to the urging force of the spring 16.

  Here, since the pressure regulating valve 1 is provided with the throttle portion 52, the pressure increase in the second pressure regulating chamber 22 can be accelerated, and the valve 14 integral with the piston 15 is brought into contact with the seat 12. Can be closed. That is, when the fuel gas G is supplied to the pressure regulating valve 1, the pressure of the fuel gas G in the first pressure regulating chamber 21 and the second pressure regulating chamber 22 can be quickly adjusted to a regulated value. As a result, since the time until the valve is closed is shortened, it is possible to suppress the pressure of the fuel gas G from acting on the packings 41 and 44, thereby preventing the packings 41 and 44 from being damaged. be able to.

  Further, since the relief valve 18 is provided on the upstream side of the throttle portion 52, the first pressure regulating chamber 21 and the second pressure regulating chamber 21 when the piston 15 is fixed in the opened state or when foreign matter is caught. When the pressure in the chamber 22 increases, a part of the pressure increased by the relief valve 18 is released to the outside. Thereby, the pressure of the fuel gas G in the first pressure regulating chamber 21 and the second pressure regulating chamber 22 is adjusted to a predetermined value or less. Therefore, even when the piston is stuck in the open state or when foreign matter is caught, damage to the packings 41 and 44 as well as parts and piping connected to the downstream side of the pressure regulating valve 1 are caused. Can be prevented.

  As described above in detail, according to the pressure regulating valve 1 according to the present embodiment, the pressure regulating valve 1 has the relief valve 18 that regulates the pressure in the second pressure regulating chamber 22 to a predetermined value or less, and the downstream side of the relief valve 18. Since the throttle portion 52 is provided on the side, the pressure of the fuel gas G in the first pressure regulating chamber 21 and the second pressure regulating chamber 22 can be quickly set to a predetermined value. Accordingly, since the time until the valve is closed is shortened, it is possible to suppress the pressure of the fuel gas G from acting on the packings 41 and 44. In addition, since the relief valve 18 is provided, the pressure in the first pressure regulating chamber 21 and the second pressure regulating chamber 22 is maintained even when the piston is stuck in the opened state or when foreign matter is caught. Since the predetermined value is not exceeded, damage to the packings 41 and 44 can be prevented.

  It should be noted that the above-described embodiment is merely an example and does not limit the present invention in any way, and various improvements and modifications can be made without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 1 Pressure regulating valve 10 Housing 11 Inlet block member 12 Seat 13 Body member 14 Valve 15 Piston 16 Spring 17 Outlet block member 18 Relief valve 21 1st pressure regulation chamber 22 2nd pressure regulation chamber 41 Packing 44 Packing 52 Restriction part 53 Pore G Fuel gas

Claims (2)

A housing, a pressure regulating chamber formed in the housing, a piston movable in the axial direction in the housing, a valve body operating integrally with the piston, and a valve seat on which the valve body can be seated; In the pressure regulating valve having a spring that biases the piston in the valve opening direction, and a seal member provided on the outer periphery of the piston,
A relief valve for adjusting the pressure in the pressure regulating chamber to a predetermined value or less;
A pressure regulating valve, wherein a throttle portion is provided downstream of the relief valve. The pressure regulating valve according to claim 1,
The pressure regulating valve, wherein the relief valve is provided integrally with the housing.

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