JP2022019228A - Pressure adjustment valve - Google Patents

Abstract

To provide a pressure adjustment valve that is able to accurately adjust the pressure of a fluid to a desired pressure.SOLUTION: In one aspect of the present disclosure, a pressure reduction valve 1 has: a relief valve 16 that is provided so as to be capable of raising within a body 12 according to a pressure P in a secondary pressure chamber 23 and opens/closes a space between the secondary pressure chamber 23 and an atmospheric chamber 24 by coming into contact with or separating from a piston 15 to open/close the valve; and a relief stopper 18 that is provided in the body 12 and comes into contact with the relief valve 16 to restrict raising of the relief valve 16. When the pressure P in the secondary pressure chamber 23 becomes higher than a set pressure, the relief valve 16 is brought into contact with the relief stopper 18 to restrict raising of the relief valve 16, and the relief valve 16 is thereby separated from the raising piston 15 to open the relief valve 16.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a pressure regulating valve that regulates the pressure of a fluid to a desired pressure.

As a prior art related to a pressure regulating valve, in the flow control valve disclosed in Patent Document 1, a moving body provided so as to be movable in the axial direction is provided in the housing, and the moving body is provided with a pressure in a pressure receiving chamber. A relief valve is arranged which is separated from the moving body and is opened when the pressure becomes higher than a predetermined pressure.

Japanese Unexamined Patent Publication No. 2008-2514

However, in the flow rate control valve disclosed in Patent Document 1, an urging member is provided on each of the valve body and the relief valve. In this case, it is not easy to adjust the urging force of each urging member, so that the urging force varies among the urging members, and as a result, the valve opening accuracy of the relief valve (that is, the pressure in the pressure receiving chamber is higher than the predetermined pressure). If it becomes high, there is a concern that the accuracy at which the relief valve will be opened) will decrease. If the valve opening accuracy of the relief valve is lowered, the pressure in the pressure receiving chamber cannot be adjusted to a predetermined pressure, and the flow rate control valve may not be able to accurately adjust the pressure of the fluid to a desired pressure.

Therefore, the present disclosure has been made in order to solve the above-mentioned problems, and an object thereof is to provide a pressure regulating valve capable of accurately adjusting the pressure of a fluid to a desired pressure.

One embodiment of the present disclosure made to solve the above problems includes a housing, a pressure receiving chamber and a moving body provided in the housing, and the moving body is said to have a pressure in the pressure receiving chamber. A pressure regulating valve that is movable in the axial direction of the moving body, is provided in the housing so as to be movable in the axial direction according to the pressure in the pressure receiving chamber, and is separated from or in contact with the moving body. It has a relief valve that opens and closes the pressure receiving chamber by opening and closing the valve, and a regulating member provided in the housing that comes into contact with the relief valve and regulates the axial movement of the relief valve. When the pressure in the pressure receiving chamber becomes higher than the predetermined pressure, the relief valve moves in the axial direction by abutting the relief valve on the regulating member and restricting the axial movement of the relief valve. The relief valve is separated from the moving body to open the relief valve.

According to this aspect, since the movement of the relief valve in the axial direction is regulated by the regulating member, it is not necessary to provide an urging member for the relief valve in order to regulate the movement of the relief valve in the axial direction. Therefore, it is possible to solve the problem caused by the variation in the urging force between the plurality of urging members caused by providing the plurality of urging members for the moving body and the relief valve. For example, it is possible to prevent the relief valve opening accuracy from being lowered due to the variation in the urging force among the plurality of urging members, and to secure the relief valve opening accuracy.

In addition, if an urging member is provided for the relief valve, the relief valve may be opened even if the pressure in the pressure receiving chamber is lower than the predetermined pressure due to the urging member being depressed. There is. However, according to this aspect, there is no possibility that such a situation will occur, and the valve opening accuracy of the relief valve can be ensured, so that the pressure in the pressure receiving chamber can be adjusted to a predetermined pressure more accurately.

Therefore, according to this aspect, the pressure of the fluid can be accurately adjusted to a desired pressure.

In the above aspect, it is preferable that the moving body is a piston formed of an inelastic body.

According to the pressure regulating valve of the present disclosure, the pressure of the fluid can be accurately adjusted to a desired pressure.

It is an overall structural view of the pressure reducing valve of this embodiment. It is a figure which shows when the relief valve is a valve open state.

<Structure and operation of pressure reducing valve of this embodiment>
Hereinafter, a pressure reducing valve, which is an example of the pressure control valve of the present disclosure, will be described. The pressure reducing valve 1 of the present embodiment is a pressure adjusting valve that reduces the pressure of the high-pressure gas G to adjust the pressure to a desired pressure. The gas G is, for example, a gaseous fuel, and more specifically, hydrogen gas supplied to a vehicle fuel cell (FC) (not shown) or compressed natural gas supplied to an internal combustion engine (not shown). Gas (CNG) and the like. That is, the pressure reducing valve 1 is used as a valve for adjusting the pressure of hydrogen gas supplied to the fuel cell for vehicles, or as a valve for adjusting the pressure of compressed natural gas supplied to the internal combustion engine. The pressure reducing valve 1 of the present embodiment is not limited to hydrogen gas and compressed natural gas, and can be applied to all fluids.

As shown in FIG. 1, the pressure reducing valve 1 includes an inlet member 11, a body 12, a valve 13, a seat 14, a piston 15, a relief valve 16, a plate adjusting 17, a relief stopper 18, and the like. ..

The inlet member 11 is a member provided at a position on the side where the gas G flows in. In the inlet member 11, a primary pressure chamber 19 is provided as a pressure chamber on the inlet side. A valve 13 and a spring 20 are provided in the primary pressure chamber 19. Further, the inlet member 11 includes an inlet 21 communicating with the primary pressure chamber 19.

The body 12 is a housing that is joined to the inlet member 11 and is provided on the side where the gas G flows out from the inlet member 11. A piston 15, a relief valve 16, a relief stopper 18, and a spring 22 are provided in the body 12. The spring 22 is an urging member that urges the piston 15 toward the valve 13. The body 12 is an example of the "housing" of the present disclosure.

In the body 12, a secondary pressure chamber 23 is provided as a pressure chamber on the outlet side between the end surface of the body 12 on the seat 14 side and the piston 15 (and the relief valve 16). The secondary pressure chamber 23 is an example of the "pressure receiving chamber" of the present disclosure.

Further, in the body 12, an air chamber 24 is provided between the piston 15 (and the relief valve 16) and the plate adjusting 17. That is, the atmosphere chamber 24 is provided on the side opposite to the secondary compression chamber 23 in the axial direction (vertical direction in FIG. 1, the central axial direction of the piston 15) with respect to the piston 15.

The body 12 has an outlet 25 for allowing the gas G to flow out of the pressure reducing valve 1 from the inside of the secondary pressure chamber 23, and a relief outlet / breathing hole 26 for taking the atmosphere from the outside of the pressure reducing valve 1 into the atmosphere chamber 24. It is equipped with. As will be described later, this relief outlet / breathing hole 26 is also used as an outlet for allowing the gas G to flow out from the atmosphere chamber 24 to the outside of the pressure reducing valve 1 when the relief valve 16 is in the valve open state. ..

The valve 13 is formed in a substantially hollow cylindrical shape, and is arranged in the primary pressure chamber 19, the inside of the inner peripheral surface of the seat 14, and the inside of the secondary pressure chamber 23. The valve 13 is movable in the axial direction relative to the inlet member 11 and the body 12. Further, the valve 13 includes a cavity 27.

Such a valve 13 is in a valve-opened state in which the primary pressure chamber 19 and the secondary pressure chamber 23 communicate with each other by being separated from the seat 14 (see FIG. 1), while abutting on the seat 14. As a result, the valve is closed to shut off the space between the primary pressure chamber 19 and the secondary pressure chamber 23.

The sheet 14 is arranged in a portion of the body 12 between the primary pressure chamber 19 and the secondary pressure chamber 23. The sheet 14 is formed in an annular shape.

The piston 15 is formed in a hollow cylindrical shape, and is provided in the body 12 between the inside of the secondary pressure chamber 23 and the atmosphere chamber 24. The piston 15 is movable in the axial direction relative to the body 12 according to the pressure P in the secondary compression chamber 23. In the present embodiment, the piston 15 is provided with a convex portion 28 protruding inward on the inner peripheral surface thereof. The piston 15 is formed of an inelastic body and is an example of the "moving body" of the present disclosure. Here, the "inelastic body" is a member that is not an elastic body (for example, rubber), that is, a member having rigidity that does not deform even when stress is applied (for example, metal).

Further, the piston 15 is provided with a groove 31 on the outer side in the radial direction thereof. By arranging the piston seal 32 in the groove 31, the piston seal 32 is arranged between the body 12 and the piston 15. The piston seal 32 is an annular sealing member that seals between the secondary pressure chamber 23 and the atmosphere chamber 24.

The relief valve 16 is provided inside the inner peripheral surface of the piston 15. Each of the relief valves 16 has a cylindrical large-diameter portion 29 and a small-diameter portion 30. The large diameter portion 29 is formed to have a larger diameter than the small diameter portion 30. Such a relief valve 16 can move in the axial direction relative to the body 12 according to the pressure P in the secondary pressure chamber 23.

Further, the relief valve 16 can open and close between the secondary pressure chamber 23 and the atmosphere chamber 24 by opening and closing the valve in contact with or separated from the piston 15. The relief valve 16 is an example of the "relief valve" of the present disclosure.

In the present embodiment, the relief stopper 18 is integrally formed with the plate adjusting 17 which is the lid member of the body 12. The relief stopper 18 is provided in the body 12, is formed in a columnar shape, and is formed so as to extend from the plate adjusting 17 in the direction of the relief valve 16. Such a relief stopper 18 can come into contact with the relief valve 16 to regulate the axial movement of the relief valve 16. The relief stopper 18 is an example of the "regulatory member" of the present disclosure.

The pressure reducing valve 1 of the present embodiment having such a configuration operates as follows. First, as shown in FIG. 1, when the valve 13 is in the valve open state, the high-pressure gas G flows into the primary pressure chamber 19 from a gas supply source (not shown) through the inlet 21. Then, the gas G flows into the secondary pressure chamber 23 through between the valve 13 and the seat 14. As a result, the pressure P in the secondary compression chamber 23 rises, so that the piston 15 rises against the urging force of the spring 22 (that is, moves upward in the axial direction), and the relief valve 16 also rises.

At this time, when the pressure P in the secondary pressure chamber 23 becomes higher than the set pressure (an example of the “predetermined pressure” of the present disclosure), as shown in FIG. 2, the small diameter portion 30 of the relief valve 16 is relieved. While the relief valve 16 is restricted from rising in contact with the stopper 18, only the piston 15 rises further. As a result, the large diameter portion 29 of the relief valve 16 is separated from the convex portion 28 of the piston 15 that further rises, and the relief valve 16 is opened. Therefore, the gas G in the secondary pressure chamber 23 flows to the atmosphere chamber 24 through the gap between the small diameter portion 30 of the relief valve 16 and the convex portion 28 of the piston 15, and then the relief outlet and the breathing hole 26. Outflows to the outside of the body 12. Therefore, the pressure P in the secondary pressure chamber 23 decreases.

After that, the piston 15 descends due to the urging force of the spring 22, and when the pressure P in the secondary pressure chamber 23 drops to the set pressure, the convex portion 28 of the piston 15 and the large diameter portion 29 of the relief valve 16 come into contact with each other. , The relief valve 16 is closed. As a result, the pressure P in the secondary pressure chamber 23 is adjusted to the set pressure. In this way, the pressure reducing valve 1 can reduce the pressure of the high pressure gas G and adjust it to a set pressure which is a desired pressure.

<Effect of this embodiment>
As described above, in the pressure reducing valve 1 of the present embodiment, when the pressure P in the secondary pressure chamber 23 becomes higher than the set pressure, the relief valve 16 is brought into contact with the relief stopper 18 to bring the relief valve 16 into contact with the relief valve 16. Regulates the rise (ie, axial upward movement). Then, by restricting the rise of the relief valve 16 in this way, the relief valve 16 is separated from the piston 15 that rises further, and the relief valve 16 is opened.

In this way, since the relief stopper 18 regulates the rise of the relief valve 16, it is not necessary to provide a spring for the relief valve 16 in order to regulate the rise of the relief valve 16. Therefore, it is possible to solve the problem caused by the variation in the urging force between the plurality of springs caused by providing the plurality of springs for the piston 15 and the relief valve 16. For example, it is possible to prevent the relief valve 16 from deteriorating the valve opening accuracy due to the variation in the urging force between the plurality of springs, and to secure the valve opening accuracy of the relief valve 16. The valve opening accuracy of the relief valve 16 is the accuracy at which the relief valve 16 is opened when the pressure P in the secondary pressure chamber 23 becomes higher than the set pressure.

Further, if a spring is provided for the relief valve 16, the relief valve 16 is opened even if the pressure P in the secondary pressure chamber 23 is less than the set pressure due to the spring being depressed. May occur. However, according to the present embodiment, there is no possibility that such a situation will occur, and the valve opening accuracy of the relief valve 16 can be ensured, so that the pressure P in the secondary pressure chamber 23 can be adjusted to the set pressure more accurately.

Therefore, according to the pressure reducing valve 1 of the present embodiment, the pressure of the gas G can be accurately adjusted to a set pressure which is a desired pressure.

Further, since the relief valve 16 is integrally provided on the piston 15 and the spring for the relief valve 16 is not provided as in the present embodiment, the pressure reducing valve 1 can be downsized.

Further, as a breathing hole for taking the atmosphere from the outside of the pressure reducing valve 1 into the atmosphere chamber 24, and when the relief valve 16 is in the valve open state, the gas G is discharged from the inside of the atmosphere chamber 24 to the outside of the pressure reducing valve 1. Since the relief outlet and the breathing hole 26 can be used as the outlet for the air chamber 24, the number of holes connecting the air chamber 24 and the outside can be reduced.

It should be noted that the above-described embodiment is merely an example and does not limit the present disclosure in any way, and it goes without saying that various improvements and modifications can be made without departing from the gist thereof.

For example, the pressure regulating valve of the present disclosure can be applied to a valve that adjusts the pressure of a fluid other than the pressure reducing valve 1 to a desired pressure.

1 Pressure reducing valve 11 Inlet member 12 Body 13 Valve 14 Seat 15 Piston 16 Relief valve 17 Plate adjusting 18 Relief stopper 19 Primary pressure chamber 20 Spring 21 Inlet 22 Spring 23 Secondary pressure chamber 24 Air chamber 25 Outlet 26 Relief outlet and breathing Hole 27 Cavity 28 Convex 29 Large diameter 30 Small diameter 31 Groove 32 Piston seal G Gas P (in secondary pressure chamber) Pressure

Claims (2)

With the housing
It has a pressure receiving chamber and a moving body provided in the housing, and has.
The moving body is a pressure adjusting valve that can move in the axial direction of the moving body according to the pressure in the pressure receiving chamber.
A relief valve that is provided so as to be movable in the axial direction according to the pressure in the pressure receiving chamber in the housing and that opens and closes the pressure receiving chamber by separating or contacting the moving body and opening and closing the valve. ,
It has a regulating member provided in the housing, which comes into contact with the relief valve and regulates the axial movement of the relief valve.
When the pressure in the pressure receiving chamber becomes higher than the predetermined pressure, the relief valve moves in the axial direction by abutting the relief valve on the regulating member and restricting the axial movement of the relief valve. To separate the relief valve from the moving body and open the relief valve.
A pressure regulating valve characterized by. In the pressure regulating valve of claim 1,
The moving body is a piston formed by an inelastic body.
A pressure regulating valve characterized by.

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