JP2002055720A - Pressure reducing valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reducing valve capable of accurately transmitting an outlet side fluid pressure to a diaphragm, and reducing an energy loss. SOLUTION: In this pressure reducing valve 1, an opening and closing valve 20 is arranged between an inlet side 11 and an outlet side 12 of fluid, and the fluid pressure at the outlet side 12 is transmitted to a diaphragm 26, and when the fluid pressure at the outlet side 12 exceeds a prescribed pressure, the diaphragm 26 is pressurized, and the opening and closing valve 20 is closed while being linked with it so that the flow of the fluid from the inlet side 11 to the outlet side 12 can be stopped. Also, a spare chamber 25 for transmitting the fluid pressure at the exist side 12 to the diaphragm 26 is formed, and a thin hole 27 for communicating the preliminary chamber 25 with the exist side 12 is formed, and the thin hole 27 is formed so as to be obliquely directed to the displaced direction of the diaphragm 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pressure reducing valve (regulator).

[0002]

2. Description of the Related Art A pressure reducing valve is generally known as a means for adjusting an outlet fluid pressure to a predetermined pressure lower than an inlet fluid pressure. In this pressure reducing valve, an on-off valve is arranged between the fluid inlet and outlet, and the fluid pressure on the outlet side is transmitted to the diaphragm, and the diaphragm and the on-off valve are linked. Until the fluid pressure on the outlet side exceeds the predetermined pressure, fluid flows from the inlet side to the outlet side by opening the on-off valve, but the fluid pressure on the outlet side exceeds the predetermined pressure and the diaphragm is pushed. In such a case, the on-off valve is closed accordingly, so that the flow of the fluid from the inlet side to the outlet side is stopped.

[0003] In such a pressure reducing valve, a spare chamber for transmitting fluid pressure on the outlet side to the diaphragm is formed, and a fine hole for communicating the spare chamber with the outlet side is provided. A configuration in which the pressure is kept the same as that described above is known, for example, from Japanese Patent Application Laid-Open No. H11-175168.

[0004]

However, in the pressure reducing valve disclosed in Japanese Patent Application Laid-Open No. H11-175168, the pores communicating the preliminary chamber and the outlet side are directed perpendicular to the diaphragm. Due to the provision, the fluid flowing into the preliminary chamber through the pores flows perpendicularly to the diaphragm. For this reason, especially when the flow rate becomes large, the inertia force (dynamic pressure) of the fluid flowing into the preliminary chamber pushes the diaphragm largely in the direction of its displacement, and the fluid pressure (static pressure) on the outlet side is reduced. There is a concern that it will not be accurately communicated. If the fluid pressure on the outlet side cannot be accurately transmitted by the diaphragm in this way, it becomes difficult not only to keep the fluid pressure on the outlet side at a predetermined pressure, but also to reduce the amount of high-pressure fluid discharged from the pressure reducing valve to the outside. As a result, the energy loss increases.

Accordingly, it is an object of the present invention to provide a pressure reducing valve capable of accurately transmitting the fluid pressure on the outlet side to the diaphragm and reducing the energy loss as much as possible.

[0006]

In order to achieve this object, according to the present invention, an on-off valve is disposed between an inlet and an outlet of a fluid, and a fluid pressure on an outlet is controlled by a diaphragm. When the fluid pressure on the outlet side exceeds a predetermined pressure and the diaphragm is pushed, the on-off valve closes in conjunction with this and the flow of fluid from the inlet side to the outlet side is stopped. In the valve, a spare chamber for transmitting the fluid pressure on the outlet side to the diaphragm is formed, a fine hole communicating the spare chamber with the outlet side is provided, and the fine hole is directed obliquely to the direction of displacement of the diaphragm. It is characterized by that.

In the pressure reducing valve according to the first aspect, since the fine holes communicating the preliminary chamber and the outlet side are directed obliquely to the direction of displacement of the diaphragm, the fine holes pass through the fine holes and enter the preliminary chamber. The flowing fluid will flow obliquely into the diaphragm. For this reason, the force of pushing the diaphragm is reduced by the inertial force (dynamic pressure) of the fluid flowing into the preliminary chamber, and the diaphragm is prevented from being pushed too much by the dynamic pressure. As a result, the fluid pressure (static pressure) on the outlet side can be accurately transmitted to the diaphragm, and the fluid pressure on the outlet side can be maintained at a predetermined pressure even when the flow rate is large. Further, the amount of the high-pressure fluid discharged from the pressure reducing valve to the outside is reduced, and the energy loss can be reduced.

In the pressure reducing valve according to the first aspect, the second aspect is the second aspect.
As described in (1), the pores are moved by 50 with respect to the direction of displacement of the diaphragm (the direction perpendicular to the diaphragm).
It is preferable to direct the light in the range of {65}. If the directional angle of the pores is less than 50 ° or more than 65 ° with respect to the displacement direction of the diaphragm, it becomes difficult to keep the fluid pressure on the outlet side at a predetermined pressure.

It is preferable that a cover is attached to the diaphragm and the pores are directed to the cover. Then, the fluid flowing into the preliminary chamber through the pores does not directly hit the diaphragm, and the force of pushing the diaphragm is further reduced by the inertial force (dynamic pressure) of the fluid flowing into the preliminary chamber. .

[0010]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view showing an internal structure of a pressure reducing valve 1 according to an embodiment of the present invention. A fluid inlet 11 and a fluid outlet 12 are provided on both sides of the valve body 10.
Is open. In the illustrated example, the inlet side 11 is open on the left side of the valve body 10, and the outlet side 12 is open on the right side.
Fluid flowing into the valve body 10 from the inlet side 11 is
After flowing into the lower chamber 15 as it is, it is filtered by a filter 16 arranged on the upper surface of the lower chamber
0 flows into the valve chamber 17 arranged at the center of
Through the outlet 8, it can be discharged from the outlet 12.

An on-off valve 20 is disposed in the valve chamber 17, and a valve seat 21 is formed on a ceiling surface of the valve chamber 17. As shown in FIG. 2, when the on-off valve 20 is lowered and separated from the valve seat 21 downward, fluid flows from the valve chamber 17 to the passage 18 through the gap between the on-off valve 20 and the valve seat 21. As a result, the fluid flows from the inlet 11 to the outlet 12. On the other hand, as shown in FIG. 3, when the on-off valve 20 is raised and is in close contact with the valve seat 21, fluid cannot pass from the valve chamber 17 to the passage 18. 12 is in a state where no fluid flows. A bottom surface of the on-off valve 20 is provided with a coil spring 22 disposed in the valve chamber 17.
So that the on-off valve 20 is constantly pressed toward the valve seat 21 by the pressing force of the coil spring 22 (that is, the on-off valve 20 is brought into close contact with the valve seat 21 to stop the flow of the fluid). It is energizing.

Above the entry side 11 and the exit side 12, there is a spare room 2
5 is formed, and the ceiling surface of the preliminary chamber 25 is partitioned by a diaphragm 26. In the illustrated example, the diaphragm 26 is horizontally arranged so as to partition the ceiling surface of the preliminary chamber 25, and the diaphragm 26 is vertically displaced in accordance with the pressure fluctuation of the fluid in the preliminary chamber 25. A small hole 27 is formed in the bottom surface of the preliminary chamber 25, and the preliminary chamber 25 communicates with the outlet side 12 through the small hole 27. As a result, the inside of the preliminary chamber 25 is maintained at the same fluid pressure as the outlet 12, and the outlet
Is configured to transmit the fluid pressure of

On the lower surface of the diaphragm 26, a cover 3 is provided.
The cover 30 has an exhaust hole 31 penetrating therethrough. On the other hand, in the center of the bottom surface of the spare chamber 25, the stem 3 set up on the on-off valve 20 described above is provided.
The upper end of the stem 32 just contacts the exhaust hole 31 of the cover body 30. As will be described later, when the diaphragm 26 is displaced downward, the upper end of the stem 32 is
, The exhaust hole 31 is closed, and the fluid in the preliminary chamber 25 does not leak into the spring chamber 35 described later. On the other hand, when the diaphragm 26 is displaced upward, the exhaust hole 31 is separated from the upper end of the stem 32, so that the exhaust hole 31 is opened, and the fluid in the preliminary chamber 25 leaks to the spring chamber 35 described later.

Above the diaphragm 26, a spring chamber 35 is provided.
The coil spring 36 is disposed inside the spring chamber 35. The lower end of the coil spring 36 is pressed against the upper surface of the diaphragm 26 via a washer 37, and is urged by the pressing force of the coil spring 36 to always push the diaphragm 26 downward. As described above, when the diaphragm 26 is pushed down, the upper end of the stem 32 always covers the exhaust hole 31, and when the opening / closing valve 20 is pushed down through the stem 32, the opening / closing valve 20 is moved downward from the valve seat 21. And the fluid flows from the inlet 11 to the outlet 12.

The upper end of the coil spring 36 is pressed by a spring receiver 38, and by turning a screw rod 39 screwed on the upper surface of the valve body 10 with a handle 40, the spring receiver 3 is pressed.
8 height can be changed. Thus, by turning the handle 40, the pressing force of the coil spring 36 that presses the diaphragm 26 downward can be adjusted.

An exhaust hole 41 is opened on a side surface of the spring chamber 35. Thus, the inside of the spring chamber 35 is always kept at the atmospheric pressure, and the inside of the spring chamber 35 can be exhausted to the outside of the valve body 10.

As shown in FIG. 4, pores 27 formed on the bottom surface of the preliminary chamber 25 are provided obliquely with respect to the direction of displacement of the diaphragm 26 (vertical direction in the illustrated example). . The dashed line 27 'in FIG. 4 indicates the direction of the pore 27 which is obliquely oriented with respect to the direction of displacement of the diaphragm 26. Thereby, the pores 27
The fluid flowing through the outlet side 12 and flowing into the preliminary chamber 24 flows obliquely into the diaphragm 26. In the illustrated example, the small holes 27 are directed in the range of 50 ° to 65 ° with respect to the displacement direction (vertical direction) of the diaphragm 26. Further, the fine holes 27 are provided so as to face the cover 30 attached to the lower surface of the diaphragm 26, so that the fluid flowing into the preliminary chamber 24 through the fine holes 27 directly hits the diaphragm 26. Not to be.

In the pressure reducing valve 1 according to the embodiment of the present invention configured as described above, the pressure of the coil spring 36 disposed inside the spring chamber 35 is maintained until the outlet 12 reaches a predetermined pressure. The diaphragm 26 is pushed down by the pressing force. As a result, the exhaust hole 31 is
2 is closed by the upper end, so that the fluid in the preliminary chamber 25 does not leak into the spring chamber 35. Further, since the diaphragm 26 is pushed down, the on-off valve 20 is pushed down via the stem 32 and moves downward from the valve seat 21, and passes through the gap between the on-off valve 20 and the valve seat 21 as shown in FIG. Fluid can pass from the valve chamber 17 to the passage 18.

Thus, the fluid that has flowed into the valve body 10 from the inlet 11 flows into the lower chamber 15 of the valve body 10 as it is, and then the filter 1 disposed on the upper surface of the lower chamber 15.
The valve chamber 1 filtered at 6 and arranged at the center of the valve body 10
7, and further flows out from the outlet side 12 through the passage 18. On the other hand, the spare chamber 25 and the outlet 1
2 are connected to each other, the inside of the preparatory chamber 25 is maintained at the same fluid pressure as the outlet side 12, and the outlet side 12
Fluid pressure is transmitted.

When the fluid pressure on the outlet side 12 exceeds a predetermined pressure, the inside of the spare chamber 25 is kept at the same fluid pressure as the outlet side 12, so that the diaphragm 26 partitioning the ceiling surface of the spare chamber 25 is opened. Is pushed up by the fluid pressure on the outlet side 12, and the diaphragm 26 is displaced upward. As a result, the exhaust hole 31 is separated upward from the upper end of the stem 32 and the exhaust hole 31 is opened.
Leaks from the spring chamber 35 to the spring chamber 35.
From the valve body 10 to the outside.

On the other hand, when the fluid pressure on the outlet side 12 exceeds the predetermined pressure as described above, the diaphragm 26 is displaced upward, and as shown in FIG. The pressure is increased by the pressing force of the coil spring 22 disposed in the inside, and the valve spring comes into close contact with the valve seat 21, so that fluid cannot pass from the valve chamber 17 to the passage 18. As a result, the flow of the fluid from the inlet 11 to the outlet 12 is stopped.

As described above, when the outlet side 12 has not reached the predetermined pressure, the fluid can flow from the inlet side 11 to the outlet side 12 by moving the on-off valve 20 downward from the valve seat 21. On the other hand, when the outlet side 12 exceeds the predetermined pressure, the on-off valve 20 rises and comes into close contact with the valve seat 21, so that the flow of the fluid from the inlet side 11 to the outlet side 12 is stopped.

However, in the pressure reducing valve 1 of this embodiment, the preliminary chamber 25
Since the fluid flowing into the pre-chamber 25 flows obliquely into the diaphragm 26, the force of pushing the diaphragm 26 by the inertial force (dynamic pressure) of the fluid flowing into the preliminary chamber 25 is reduced, and the diaphragm 26 is prevented from being greatly pushed by the dynamic pressure. Is done. As a result, the fluid pressure (static pressure) on the outlet side 12 can be accurately transmitted to the diaphragm 26. Further, the amount of the high-pressure fluid discharged from the exhaust port 41 to the outside of the pressure reducing valve 1 is reduced, and the energy loss is also reduced.
Further, since the pores 27 are provided to face the cover 30 attached to the lower surface of the diaphragm 26, the fluid flowing into the preliminary chamber 24 does not directly hit the diaphragm 26, and the inertia force of the fluid ( The force for pushing the diaphragm 26 is further reduced by the dynamic pressure.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment. For example, the filter 16 and the like can be omitted. In addition, modifications can be made as appropriate within the scope of the concept of the present invention.

[0025]

EXAMPLE In the pressure reducing valve described with reference to FIG. 1 and the like, a fluid was actually caused to flow, and the relationship between the angle of the pore and the fluid pressure on the outlet side was examined. The result is shown in FIG. When the angle of the pores is less than 50 ° or more than 65 ° with respect to the direction of displacement of the diaphragm (perpendicular to the diaphragm), the fluid pressure on the outlet side is maintained at a predetermined pressure as the flow rate increases. Became difficult.

[0026]

According to the first to third aspects, the fluid pressure (static pressure) on the outlet side can be accurately transmitted to the diaphragm, and even when the flow rate increases, the outlet side pressure can be accurately adjusted to the predetermined pressure. Will be able to keep Also, the amount of the high-pressure fluid discharged to the outside is small, and the energy loss is small. In particular, according to the third aspect, the force for pushing the diaphragm by the inertial force (dynamic pressure) of the fluid is further reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an internal structure of a pressure reducing valve according to an embodiment of the present invention.

FIG. 2 is an enlarged explanatory view of an on-off valve in a state where fluid flows from an inlet side to an outlet side.

FIG. 3 is an enlarged explanatory view of the on-off valve in a state where the flow of the fluid is stopped.

FIG. 4 is an enlarged view of a spare room.

FIG. 5 is a graph showing the relationship between the angle of the pore and the fluid pressure on the outlet side.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 pressure reducing valve 10 valve body 11 inlet side 12 outlet side 15 lower chamber 16 filter 17 valve chamber 18 passage 20 on-off valve 21 valve seat 22 coil spring 25 preliminary chamber 26 diaphragm 27 pore 30 cover body 31 exhaust hole 32 stem 35 spring chamber 36 Coil spring 37 Washer 38 Spring receiver 39 Screw bar 40 Handle 41 Exhaust hole

Claims (3)

[Claims] An on-off valve is disposed between an inlet side and an outlet side of a fluid to transmit a fluid pressure on an outlet side to a diaphragm, and when the fluid pressure on an outlet side exceeds a predetermined pressure and the diaphragm is pushed, the diaphragm is interlocked therewith. A pressure reducing valve configured to close the on-off valve and stop the flow of fluid from the inlet side to the outlet side, forming a spare chamber for transmitting fluid pressure on the outlet side to the diaphragm; A pressure-reducing valve, characterized in that a fine hole communicating with the diaphragm is provided, and the fine hole is directed obliquely to the direction of displacement of the diaphragm. 2. The pressure reducing valve according to claim 1, wherein said small hole is directed in a range of 50 ° to 65 ° with respect to a direction of displacement of said diaphragm. 3. The pressure reducing valve according to claim 1, wherein a cover is attached to the diaphragm, and the small holes are directed toward the cover.