JP2000207031A - Safety valve mechanism and pressure regulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the structure of a safety valve mechanism capable of holding adjustment pressure on a constant level when an adjustment spring is in an initial setting state for a long time in a pressure regulator having a pressure reducing function. SOLUTION: This pressure regulator contains a primary chamber A in which a regulating valve 40 is arranged, a secondary chamber B where a regulating value guide 60 that follows the regulating value and is movable and a pressure receiving member 30 arranged so as to regulate desired set pressure in the secondary chamber by the power of an adjustment spring 71, the member 30 has a discharge hole 34 punched so as to communicate the secondary chamber with adjustment spring arrangement space and an O ring 36 arranged on the internal diameter side of a discharge hole made of an elastic member, and the guide 60 makes its point side a shape in which it is insertable into the hole 34 and is provided with a 1st step part 64 which seals the secondary chamber by coming into contact with the ring 36 by pressure at the point side and a 2nd step part 65 that regulates the movement of the pressure receiving member to the secondary chamber side by coming into contact with the member 30 by pressure when it seals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety valve structure in a pressure regulator for reducing the pressure of a high-pressure gas to a required gas pressure. It relates to a pressure regulator provided with this mechanism.

[0002]

2. Description of the Related Art An auto-relief type pressure regulator having a safety valve mechanism is provided with an inlet 13 and an outlet 14 on the side of a regulator body 10 as shown in FIG. A primary chamber A communicating with the inflow port 13 and partitioned by the valve seat body 20 and a secondary chamber B communicating with the outflow port 14 and covered with the diaphragm 31 are formed. A regulating valve 40 is provided in the primary room A, and the regulating valve 40 is provided in the secondary room B.
The adjustment valve guide 60 that can move in accordance with the adjustment is provided.

A pressure receiving member 30 receiving a pressure in the secondary chamber is formed by a diaphragm 31 formed of an elastic material such as rubber which does not have air permeability, and a diaphragm receiver 32 mounted on the anti-secondary chamber side of the diaphragm 31. Further, a discharge valve 34 is formed in the center of the pressure receiving member 30, so that the safety valve is configured by the adjustment valve guide 60 and the pressure receiving member 30. The pressure receiving member 30 is configured so that the force of the adjustment spring 71 acts on the pressure receiving member 30. Further, an annular convex portion (valve seat) 6 having a sharp top surface at the distal end surface of the adjustment valve guide 60.
The annular convex portion (valve seat) 68 is configured to close the discharge hole 34 by abutting on the surface of the diaphragm 31.

FIG. 3 (b) shows another structure of an auto-relief type pressure regulator having a safety valve mechanism. The structure of the pressure regulating member guide 60 and the pressure receiving member 30 constituting the safety valve are different. That is, the pressure receiving member 30 is formed by sandwiching the diaphragm 31 between the diaphragm receiver 32 and the adjustment valve guide receiver 37, and an annular convex portion (valve seat) 38 having a sharp top surface provided on the adjustment valve guide receiver 37. Abuts on a resin or rubber valve seat 69 mounted on the adjustment valve guide 60. The discharge hole 34 is provided in the pressure receiving member 3.
0 is provided in the adjustment valve guide receiver 37. The other configuration is the same as the configuration shown in FIG. 3A, and the same components are denoted by the same reference numerals and detailed description thereof will be omitted.

According to the pressure regulators having the above-described structures, when the urging force of the adjusting spring 71 is adjusted by the pressure adjusting screw 73 so that a desired secondary pressure is obtained in the secondary chamber, the pressure in the secondary chamber B is reduced. Is less than the set pressure, as shown in FIGS.
The adjusting valve guide 60 and the adjusting valve 40 move against the elastic force of the buffer spring 50 by the urging force of the above, and the high-pressure gas from the inflow port 13 flows from the primary chamber A to the secondary chamber B through the gap of the valve hole 21. Flows into

When the pressure in the secondary chamber B rises due to the inflow of the high-pressure gas, the pressure-receiving member 30 receives the pressure, and as shown in FIGS.
The pressure-receiving member 30 moves against the force of the pressure, and the adjusting valve 40 moves to the valve seat 22 side by the force of the buffer spring 50. When the secondary chamber A reaches a desired set pressure, the adjusting valve moves to the valve seat 22. 40
The valve seat 41 abuts and the valve hole 21 is closed (the urging force of the adjusting spring 71 is adjusted so that the diaphragm 31 becomes flat with respect to the mounting surface in this state). The adjusting valve 40 repeats the above operation, and the valve seat 22 comes into contact with or separates from the valve seat 41 to reduce the high-pressure gas to a constant pressure in the secondary chamber, and to set the pressure in the secondary chamber B to a desired set pressure. It is possible to do.

On the other hand, if for some reason the pressure reducing mechanism does not work and the pressure in the secondary chamber exceeds the set pressure, FIGS.
, The pressure receiving member 30 moves further rightward against the force of the adjustment spring 71, the adjustment valve guide 60 separates from the pressure receiving member 30, the discharge hole 34 is opened, and the gas in the secondary chamber flows out. By doing so, it is possible to prevent the pressure in the secondary chamber from exceeding the set pressure (safety valve mechanism).

[0008]

However, according to the safety valve mechanism having the above structure, during normal pressure adjustment,
Since the adjustment valve guide 60 and the pressure receiving member 30 are in contact with each other by the urging force of the adjustment spring 71, the buffer spring 50
The adjustment shown in FIG. 6A is caused by the secular change of the diaphragm 31 formed of an elastic body having no air permeability such as rubber and the abutting portion of the valve seat 41 made of resin or rubber due to the urging force of the above. The portion where the annular convex portion (valve seat) 68 of the valve guide 60 is located in the diaphragm and the annular convex portion (valve seat) 38 of the adjustment valve guide receiver 37 shown in FIG. (For example, the annular convex portions 68, 38 by the length l)
(The leading end of each of them enters the diaphragm 31 and the valve seat 69).

As a result, for example, when the tips of the annular projections 68, 38 intrude into the valve seats 41, 69 by the length l, the compression amount of the adjusting spring 71 becomes smaller than the length at the time of the initial set pressure. In addition, there has been a problem that the load of the adjustment spring 71 is reduced and the adjustment pressure is reduced by about 10% from the initial set pressure. Therefore, according to the above-described safety valve mechanism, the adjustment pressure cannot be kept constant with the initial setting for a long period of time.

The present invention has been made in view of the above circumstances, and in a pressure regulator having a pressure reducing function, a safety valve mechanism capable of maintaining a constant adjustment pressure with an adjustment spring being initially set for a long period of time. The purpose is to provide a structure.

[0012]

To achieve the above object, the present invention provides a primary chamber in which an adjusting valve is installed, and a secondary chamber in which an adjusting valve guide movable following the adjusting valve is installed. And a pressure receiving member arranged to adjust the pressure in the secondary chamber to a desired set pressure by the force of an adjustment spring installed on the side opposite to the secondary chamber. It is a safety valve mechanism. A discharge hole is formed in the pressure receiving member to allow the secondary chamber and the adjustment spring installation space to pass through. An O-ring formed of an elastic member is installed on the inner diameter side of the discharge hole. The distal end side of the adjustment valve guide has a shape that can be inserted into the discharge hole, and has a first step portion and a second step portion. The secondary chamber is sealed by the contact between the O-ring and the first step portion, and at the time of this sealing, the second step portion and the pressure receiving member come into contact with each other to prevent the pressure receiving member from moving toward the secondary chamber. The structure shall be regulated.

According to a second aspect of the present invention, the primary chamber in which the adjusting valve is installed, the secondary chamber in which the adjusting valve guide movable following the adjusting valve is installed, and the secondary chamber are installed on the opposite side. And a pressure receiving member arranged to adjust the pressure in the secondary chamber to a desired set pressure by the force of an adjusting spring. The pressure regulator having a pressure reducing function includes the following configuration. The pressure receiving member has a discharge hole formed so as to pass through the secondary chamber and the adjustment spring installation space, and an O-ring formed of an elastic member and installed on an inner diameter side of the discharge hole. A first step portion that seals the secondary chamber by abutting the O-ring on the distal end side of the regulating valve guide, the distal end side having a shape insertable into the discharge hole;
A second step portion for restricting the movement of the pressure receiving member toward the secondary chamber by contacting the pressure receiving member at the time of sealing.

According to the configuration of the safety valve mechanism and the pressure regulator described above, when the pressure in the secondary chamber is lower than the set pressure,
The first step portion of the regulating valve guide inserted into the discharge hole comes into contact with the O-ring, so that the secondary chamber and the outside are sealed. During this sealing, the second step portion and the pressure receiving member come into contact with each other, and the movement of the pressure receiving member toward the secondary chamber is restricted, and the position of the first step portion and the O-ring in the contact state is restricted. To be constant. When the pressure in the secondary chamber exceeds the set pressure, the pressure receiving member separates from the second step portion of the regulating valve guide, the first step portion and the O-ring separate, and the discharge hole is opened. The gas can escape.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. 1 and 2 show a pressure-reducing pressure regulator having a safety valve mechanism according to an example of an embodiment of the present invention. FIG. 1 shows a state in which the pressure is adjusted, and FIG. Respectively.

This pressure regulator comprises an upper columnar space 11 and a lower columnar space 12 having different inner diameters.
Are connected to each other, and a cylindrical lid-shaped valve seat main body 20 is inserted and arranged in the peripheral wall of the lower cylindrical space portion 12 to form a primary chamber A, and the upper cylindrical space portion 11 is covered with a pressure receiving member 30. Thus, a secondary chamber B is formed. The regulator body 10 is provided with an inlet 13 communicating with the primary chamber A and an outlet 14 communicating with the secondary chamber B on the side surface thereof.

The partition wall of the valve seat body 20 has a valve hole 2
1 and a valve seat 2 around which an annular convex portion is formed with respect to the inflow side.
2 are formed. An adjustment valve 40 is arranged in the primary chamber A, and a valve seat 41 is provided on the valve seat 22 side of the adjustment valve 40. The regulating valve 40 is urged toward the valve seat 22 by a buffer spring 50 installed at the bottom of the primary chamber A, so that the valve seat 41 contacts the valve seat 22 of the valve seat body 20 and closes the valve hole 21. It is configured.

A peripheral wall 24 is provided on the secondary chamber B side of the valve seat body 20 so as to form a cylindrical space 23 inside, and an adjusting valve guide 60 is disposed in the cylindrical space 23. The adjustment valve guide 60 has a guide rod 62 arranged at one end, which is arranged so that the cylindrical piston portion 61 slides on the peripheral wall, and is inserted into the valve hole 21 and abuts on the head of the adjustment valve 40. The other end has a rod portion 63 facing the inside of the secondary chamber B. Columnar space 23 in valve seat body 20
Is communicated with the secondary chamber B by passages 25 and 25 formed in the peripheral wall 24, and a hole SI for preventing the adjustment valve guide 60 from coming out of the columnar space 23 at the distal end side of the peripheral wall 24.
A mold ring 51 is mounted. The SI ring for hole 51 may be replaced with a stopper by screwing.

The pressure receiving member 30 includes a diaphragm 31 disposed between the opening side of the adjuster main body 10 so as to be covered with the adjuster cover 70 and a diaphragm receiver 32 disposed in the adjuster cover 70 and a secondary chamber. It is configured so as to be sandwiched by a diaphragm fixing member 33 located in B. The diaphragm receiver 32 includes a cylindrical portion 32a and a flange portion 32b formed substantially around the center thereof. A discharge hole 34 is formed in the diaphragm receiver 32 along the axial direction. The discharge hole 34 includes a guide portion 34a on the side opposite to the secondary chamber B and a flow path portion 34b having a diameter slightly larger than the guide portion 34a. Have been. An annular step 35 is formed at an end of the column 32a on the side of the secondary chamber of the flow path 34b, and an O-ring 36 is arranged on the step 35. This O-ring 36
Is fixed by a diaphragm fixing member 33 fixed to the column 32a in a state where the diaphragm 31 is arranged on the flange 32b.

The rod portion 63 of the adjustment valve guide 60 is provided with a first step portion 64 and a second step portion 65 from the distal end side, and the step surface of the second step portion 65 and the nut surface of the diaphragm fixing member 33 abut. The portion closer to the front end than the second step 65 can be inserted into the discharge hole 34 of the pressure receiving member 30. When the step surface of the second step portion 65 and the nut end surface of the diaphragm fixing member 33 come into contact with each other, the step surface of the first step portion 64 and the O-ring 36 come into contact with each other, so that the secondary chamber B and the outside are in contact with each other. It is configured to be sealable.
A portion of the rod portion 63 closer to the tip than the first step portion 64 has a diameter large enough to be inserted into the guide portion 34a.
A communication hole 66 is formed along the axis. The communication hole 66 communicates with the flow path portion 34b by a communication hole 67 formed in a diameter direction of the rod portion 63.

A pressure adjusting spring 71 for adjusting the inside of the secondary chamber B to a desired set pressure is provided in the adjuster cover 70.
Is disposed between the flange 32b of the diaphragm receiver 32 and the pressure adjusting nut 72. Pressure adjusting nut 72
Is screwed to a pressure adjusting screw 73 facing the outside of the central head of the adjuster cover 70, and the adjuster cover 7 of the pressure adjusting nut 72 is rotated by rotating the pressure adjusting screw 73.
The position within 0 is advanced and retracted, and the urging force applied to the flange 32b by the pressure adjusting spring 71 is adjusted. The inside of the adjuster cover 70 has a hole 7 formed on the side surface thereof.
It communicates with the outside from 0a.

Next, the operation of the above-described pressure regulator will be described. In the pressure regulator, the high pressure gas is
When the urging force of the adjusting spring 71 is not applied to the adjusting valve 40 via the adjusting valve guide 60, the valve seat 41 of the adjusting valve 40 is moved by the force of the buffer spring 50. 22 and valve hole 2
1 is closed to keep the valve closed. When the pressure regulator is used in the flow path actually piped, in the initial state, the pressing force of the adjustment spring 71 is adjusted by turning the pressure adjustment screw 73 on the regulator cover 70 side, and the adjustment spring is adjusted. The urging force of 71 is applied to the diaphragm receiver 32, the diaphragm fixing member 33, and the adjustment valve guide 6.
Acting on the adjustment valve 40 via the zero, the adjustment valve 40 is moved against the force of the buffer spring 50 to separate the valve seat 41 from the valve seat 22 and set the valve open state.

In this state (FIG. 1B), the valve hole 2
When gas flows from the primary chamber A to the secondary chamber B through 1, the pressure in the secondary chamber rises and the diaphragm 31 is pushed up, so that the diaphragm fixing member 33 and the adjustment valve guide 60 move, and the buffer spring force is applied. When the adjusting valve 40 moves and the pressure in the secondary chamber reaches a desired set pressure set by the adjusting spring 71, the valve seat 41 of the adjusting valve 40 comes into contact with the valve seat 22 to close the valve (FIG. 1). (A)). At this time, the piston portion 61 of the adjustment valve guide 60 is
It comes into contact with the mold ring 51. Then, the pressure in the secondary chamber is set to the set pressure, and the gas reduced to a constant pressure flows out from the outlet 14 by repeatedly contacting and separating the regulating valve 40 from the valve seat 41 to the valve seat 22. (Pressure adjustment state).

In this pressure adjustment state (FIGS. 1A and 1B), the pressure in the secondary chamber B is lower than the set pressure, and the urging force of the adjustment spring 71 acts on the adjustment valve 40. The first step portion 64 of the regulating valve guide 60 inserted into the discharge hole 34 abuts on the O-ring 36 to seal the secondary chamber B from the outside. Also, at the time of this sealing, the second step 65 and the pressure receiving member 30 come into contact with each other due to the presence of the second step 65 provided in the adjustment valve guide 60, and the pressure receiving member 30 moves to the secondary chamber side B. Regulated, first step 6
4 prevents the O-ring 36 from being pressed more than necessary,
O during sealing by the urging force of the adjusting spring 71
It is possible to prevent the ring 36 from being deformed more than necessary.

When gas flows into the secondary chamber B without being reduced to a desired pressure for some reason and rises in the secondary chamber B beyond the set pressure, the force of the adjusting spring 71 is resisted. As the diaphragm 31 is further pushed up, the diaphragm receiver 32 and the diaphragm fixing member 3
3 moves until the flange 32b of the diaphragm holder 32 contacts the step 70b of the regulating valve cover 70 at the maximum. Since the movement of the regulating valve guide 60 is regulated by the presence of the SI ring 51 for holes, the second step 65 of the rod 63 of the regulating valve guide 60 is separated from the diaphragm fixing member 33 and the first step 64 And the O-ring 36 are separated, the sealing state is released, and the discharge hole 34 is opened (FIG. 2). As a result, the gas in the secondary chamber is guided into the regulator cover 70 through the flow path 34b and the communication holes 66 and 67,
It is discharged to the outside through the hole 70a on the side surface of the adjuster cover 70.

The safety valve mechanism having the above-described structure includes the pressure receiving member 3
Although the diaphragm 31 is used as 0, a structure in which the pressure in the secondary chamber B is received by a piston-like member that slides in the secondary chamber B instead of the diaphragm may be used.

According to the pressure regulator having the safety valve mechanism having the above structure, the first step portion 6 of the rod portion 63 of the regulation valve guide 60 inserted into the discharge hole 34 in the pressure regulation state.
4 and the O-ring 36 abut, and the secondary chamber B and the outside are sealed. At the time of sealing, the presence of the second step 65 of the rod 63 of the adjustment valve guide 60 causes
Movement of the diaphragm fixing member 33 toward the secondary chamber is restricted. As a result, the position of the pressure receiving member 30 with respect to the set adjustment pressure can be fixed, so that the set adjustment pressure can be kept the same as the initial setting.

The movement of the diaphragm fixing member 33 toward the secondary chamber B is restricted, so that the first step portion 64 is formed.
Pressing between the O-ring 36 and the O-ring 36 is restricted.
6 can be prevented from being unnecessarily applied to the force of the buffer spring 50, and the length of the adjustment valve guide that affects the adjustment pressure can always be kept constant. Furthermore, unlike the conventional example, the O-ring 36 is sealed with the O-ring 36 instead of sealing it with the sharp portion of the top surface of the annular convex portion with respect to the elastic member. Can be prevented from being applied, and its deformation can be kept constant.

[0029]

According to the present invention, the movement of the pressure receiving member toward the secondary chamber is restricted by the presence of the second step in the pressure adjusting state of the pressure reducing type pressure regulator having the safety valve mechanism. Since the pressure between the first step portion and the O-ring is kept constant, the durability of the O-ring portion is improved and deformation is suppressed within a sealable range, and the position of the pressure receiving member with respect to the set adjustment pressure can be fixed. In addition, it is possible to provide a structure that can maintain the set adjustment pressure the same as the initial setting.

[Brief description of the drawings]

FIG. 1 is a cross-sectional explanatory view showing a pressure adjustment state of an auto-relief pressure regulator as an example of an embodiment of the present invention, where (a) shows a valve closed state and (b) shows a valve open state, respectively. ing.

FIG. 2 is an explanatory sectional view showing a state in which a safety valve is operating in the auto-relief pressure regulator of FIG. 1;

FIGS. 3 (a) and 3 (b) are cross-sectional explanatory views showing a valve closed state of a conventional auto-relief pressure regulator.

FIGS. 4A and 4B are cross-sectional explanatory views showing a valve-open state of a conventional auto-relief pressure regulator.

FIGS. 5A and 5B are cross-sectional explanatory views showing a state where a safety valve is operating in a conventional auto-relief pressure regulator.

FIGS. 6A and 6B are cross-sectional views of a part of the pressure regulator for explaining the reason why the set pressure varies in the conventional auto-relief pressure regulator.

[Explanation of symbols]

10: regulator body, 13: inlet, 14: outlet,
20: valve seat body, 21: valve hole, 22: valve seat, 24
... peripheral wall, 30 ... pressure receiving member, 31 ... diaphragm, 3
2 ... diaphragm receiver, 33 ... diaphragm fixing member,
34 ... discharge hole, 36 ... O-ring, 40 ... regulating valve,
41: valve seat, 50: buffer spring, 51: SI ring for hole, 60: guide of regulating valve, 61: piston part,
62 guide rod, 63 rod part, 64 first step part, 65 second step part, 66, 67 communication hole, 70
... Adjuster cover, 71 ... Adjustment spring, A ... Primary room, B ... Secondary room

Claims (2)

[Claims] 1. A primary chamber in which an adjustment valve is installed, a secondary chamber in which an adjustment valve guide movable following the adjustment valve is installed, and an adjustment spring installed on the opposite side of the secondary chamber. A pressure receiving member arranged to adjust the secondary chamber to a desired set pressure by force; and a pressure receiving member, wherein a discharge hole through which the secondary chamber and the adjustment spring installation space pass is formed in the pressure receiving member. An O-ring formed of an elastic member is installed on the inner diameter side of the discharge hole, while the distal end side of the regulating valve guide is shaped to be insertable into the discharge hole, and the first step portion and the second A step portion is formed, and the secondary chamber is sealed by contact between the O-ring and the first step portion. At the time of sealing, the second step portion and the pressure receiving member come into contact with each other, and the secondary pressure of the pressure receiving member is reduced. It is characterized in that the movement to the room side is restricted. Safety valve mechanism. 2. A primary chamber in which an adjusting valve is installed, a secondary chamber in which an adjusting valve guide movable following the adjusting valve is installed, and an adjusting spring installed on the opposite side of the secondary chamber. A pressure receiving member arranged to adjust the secondary chamber to a desired set pressure by force; and a pressure regulator having a pressure reducing function, wherein the pressure receiving member passes through the secondary chamber and the adjustment spring installation space. A discharge hole drilled so as to be formed, and an O-ring formed of an elastic member and installed on the inner diameter side of the discharge hole, while the adjusting valve guide has a shape in which a distal end side thereof can be inserted into the discharge hole, A first step portion that seals the secondary chamber by contact with the O-ring at the distal end, and restricts the movement of the pressure receiving member to the secondary chamber side by contacting the pressure receiving member during sealing. And a second step portion is provided. Pressure regulator, wherein the door.