JP2007051730A - Regulating valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent breakage of a diaphragm by preventing excessive abnormal deformation of the diaphragm when a pressure exceeding a set pressure is applied to the diaphragm. <P>SOLUTION: In the regulating valve, the ruuber diaphragm 17 is used in a drive part 2. A barrier 34, suppressing abnormal deformation of a convolution part 17a in the diaphragm 17 when a pressure exceeding a pressure set in the drive part 2 is applied to the diaphragm, is provided in an abnormal deformation side of the convolution part 17a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a regulating valve such as a pressure reducing valve or a back pressure valve using a rubber diaphragm as a drive unit.

The pressure reducing valve disclosed in Patent Document 1 uses a diaphragm in its driving part, and the diaphragm has a primary side pressure provided with its outer peripheral edge sandwiched between a valve box and a spring cover and partitioned in the valve box. Adjustment that acts on the diaphragm is connected to the valve body that opens and closes the valve port that communicates the chamber and the secondary pressure chamber, and is biased in the valve opening direction by the adjustment spring built in the spring cover The biasing force in the valve opening direction of the spring and the secondary side pressure received by the diaphragm in the valve closing direction are balanced to keep the secondary side pressure at a certain pressure lower than the primary side pressure.
In addition, the diaphragm is provided with a spring receiver for receiving one end of the adjusting spring at the center thereof, and a convolution portion having a cross section bent into a mountain shape is provided around the spring receiver so that when the diaphragm is displaced, The volume part bends and stretches.
Japanese Utility Model Publication No. 53-148332 (FIGS. 1 and 2)

In the pressure reducing valve with the above configuration, if troubles such as foreign matter being caught between the valve seat around the valve opening and the valve body and the valve body are unable to close, The secondary side pressure and the primary side pressure in the box become the same pressure, and the pressure exceeds the pressure set by the adjustment spring, and acts on the pressure receiving surface of the secondary side pressure of the diaphragm.
In this way, when pressure exceeding the set pressure acts on the pressure receiving surface of the secondary side pressure of the diaphragm,
The convolution part which deform | transforms when a diaphragm displaces has a subject which expands and deform | transforms abnormally to the spring cover side, and the part is torn eventually.
Further, the above-mentioned diaphragm breakage is not limited to the pressure reducing valve, but can be found in the back pressure valve, the differential pressure valve, and other self-regulating valves.
The present invention provides an adjustment valve such as a pressure reducing valve that uses a rubber diaphragm as a drive unit so that when a pressure exceeding a set pressure is applied to the diaphragm, the convolution part that deforms due to the displacement of the diaphragm does not deform abnormally. The purpose is to prevent breakage and improve pressure resistance.

In view of the above problems, the present invention is a regulating valve that uses a rubber diaphragm as a drive unit,
It is characterized in that a barrier is provided on the abnormal deformation side of the convolution part to prevent the convolution part of the diaphragm from deforming abnormally when pressure exceeding the pressure set in the drive part acts on the diaphragm. .
Further, it is better to set the barrier so that it does not come into contact with the convolution part when the regulating valve functions normally.

In short, in the present invention, when an abnormal pressure exceeding the set pressure of the regulating valve is applied to the diaphragm due to a problem such as foreign matter being caught between the valve body and the valve seat, the diaphragm is displaced by the pressure increase. The convolution part that deforms when it is deformed tends to bulge and deform abnormally due to its elastic characteristics, but on the abnormal deformation side, there is a barrier that prevents the abnormal deformation from being constrained. When the volume part touches, further abnormal deformation is suppressed and the abnormal bulging deformation can be prevented as much as possible.
In this way, since excessive deformation of the convolution portion of the diaphragm is suppressed, the diaphragm is prevented from being damaged, so that the pressure resistance of the diaphragm can be improved.
Also, the effective pressure receiving diameter of the diaphragm is usually between the tops of the convolution parts in the diametrical direction of the diaphragm. The effective pressure receiving diameter is increased with the progress of deformation due to the contact with the barrier of the convolution part. Since the effective pressure receiving area corresponding to the effective pressure receiving diameter of the diaphragm is reduced due to the shift to the center side, the load received by the diaphragm due to the abnormal pressure becomes gradually smaller than the initial occurrence of the abnormal pressure, The load against the abnormal pressure of the diaphragm can be reduced, which can reduce not only the diaphragm but also the load due to the abnormal pressure on peripheral parts of the diaphragm such as a valve stem and a valve body.

The barrier is set so that it does not come into contact with the convolution part when the regulating valve is functioning normally. Therefore, when the regulating valve is functioning normally, the convolution part can avoid problems such as contact with the barrier and wear. Its practical effect is enormous.

Embodiments of the present invention will be described below with reference to the drawings.
1 to 3 show a regulating valve according to the present invention.
This regulating valve is a pressure reducing valve mainly composed of a valve box 1 and a drive unit 2 which is incorporated in the valve box 1 and operates an on-off valve according to a pressure fluctuation on the secondary side.

The valve box 1 is provided with a concave portion 3 in the upper part thereof, and an inlet 4 and an outlet 5 are opened on the left and right sides. The inlet 4 and the outlet 5 are separated by a partition wall 6 inside the valve box 1. It communicates with each of the primary pressure chamber 7 and the secondary pressure chamber 8 which are partitioned in the vertical direction.
The partition wall 6 is provided with a valve port 9 for communicating the primary side pressure chamber 7 and the secondary side pressure chamber 8, and communicated with the primary side pressure chamber 7 at the center of the bottom of the concave portion 3 corresponding to the valve port 9. An opening 10 is provided, the opening
A retainer guide 11 is inserted and fixed from 10 to the valve port 9.

The retainer guide 11 is formed in a substantially cylindrical shape, and is provided with a partition wall 12 that is divided into upper and lower portions, and is disposed below the partition wall 12 at an appropriate position on the lower peripheral surface corresponding to the primary pressure chamber 7. A communication port 13 between the pressure chamber 7 and the valve port 9 is opened.

The drive unit 2 is connected to a valve body 15 detachably provided on a valve seat 14 provided on the periphery of the lower opening of the valve port 9, and an upper end of a valve rod 16 protruding above and below the valve body 15, and A diaphragm 17 that is displaced by pressure fluctuations in the secondary side pressure chamber 8, an adjustment spring 18 that biases the diaphragm 17 in the valve opening direction of the valve body 15, and a valve body spring that biases the valve body 15 in the valve closing direction It consists mainly of 19 and.
The lower part of the valve stem 16 is slidably inserted into a cylindrical valve stem guide 20 erected at the center of the bottom of the secondary pressure chamber 8, and is provided below the valve body 15 and around the valve stem guide 20. Between the spring receiver 21 and the valve stem 16
A valve spring 19 that loosely fits below is compressed and interposed.
The lower end of the valve stem guide 20 communicates with the secondary pressure chamber 8 through a small hole 22.

The upper portion of the valve stem 16 is slidably inserted through the center of the partition wall 12 of the retainer guide 11, the upper end is inserted through the center of the diaphragm 17, is abutted against the upper surface of the diaphragm 17, and the lower end of the adjustment spring 18 is A disc-shaped spring receiver 23 that also serves as a diaphragm receiver, and a retainer that is abutted against the lower surface of the diaphragm 17 and that is slidably fitted into a concave portion 24 above the partition wall 12 in the retainer guide 11.
25 and fixed.
As a result, the center of the diaphragm 17 is fixed to the upper end of the valve stem 16 while being sandwiched between the spring receiver 23 and the retainer 25.
The outer peripheral edge of the diaphragm 17 includes a concave surface portion 3 at the top of the valve box 1 and a substantially hat-shaped spring cover.
Thus, the diaphragm 17 partitions the concave portion 3 and the spring cover 26 in a watertight manner.

Further, the concave portion 24 hermetically sealed by insertion of the retainer 25 forms a part of the primary pressure chamber 7 through a small hole 27 penetrating in a proper position of the partition wall 12.
Note that O-rings 28 and 29 are attached to the outer peripheral surface of the retainer guide 11 corresponding to the opening 10 and the outer peripheral surface of the retainer 25 slidably contacting the inner peripheral surface of the concave portion 24, respectively. Part 3
And the primary pressure chamber 7 are partitioned in a watertight manner.
The concave surface portion 3 and the secondary pressure chamber 8 are communicated with each other by a pressure detection pipe 30 provided outside the valve box 1 (see FIG. 2).

The spring cover 26 is screwed into the upper end thereof with a bolt-shaped adjustment screw 31 that protrudes into the spring cover 26, and at the lower end of the adjustment screw 31, a spring receiver 32 that receives the upper end of the adjustment spring 18 is pressed from above.
An adjustment spring 18 is interposed between the spring receivers 23 and 32 for compression.
The adjusting screw 31 is screwed with a lock nut 33 outside the spring cover 26.

In the regulating valve having the above-described configuration, the diaphragm 17 has a convolution portion 17a that is bent in a mountain shape so as to surround the outer periphery of the spring receiver 23, and the diaphragm 17 is caused by fluctuations in the secondary pressure. When displaced, the convolution part 17a is deformed so as to bend and stretch.
When a pressure exceeding the pressure set by the adjustment spring 18 of the drive unit 2 (hereinafter referred to as an abnormal pressure) acts on the pressure receiving surface S of the secondary side pressure of the diaphragm 17, the convolution unit 17a. Is abnormally bulging and deforming with the spring cover 26 side as an abnormal deformation side, but in the regulating valve of the present invention, the convolution part 17a is abnormally deformed on the inner wall of the spring cover 26 on the abnormal deformation side of the convolution part 17a. A barrier 34 is provided to prevent this from occurring.

The barrier 34 is formed on the annular protrusion 35 with a triangular cross-section provided around the inner wall of the tapered portion 26b that is reduced in diameter toward the upper side of the flange portion 26a provided at the lower end of the spring cover 26,
The protrusion 35 is an annular horizontal surface facing the top portion 17b of the convolution portion 17a.
Further, the barrier 34 is not in contact with the top portion 17b of the convolution portion 17a that protrudes most toward the spring cover 26 side in a state where the regulating valve functions normally, and the convolution portion 17a abnormally moves toward the spring cover 26 side due to abnormal pressure. When the bulging deformation occurs, the formation position with respect to the tapered portion 26b is set so that the abnormally deformed convolution portion 17a touches the barrier 34 (
(See FIG. 3).
Further, the inner diameter of the protrusion 35 is set so as not to interfere with the outer periphery of the spring receiver 23.

Although the present embodiment is configured as described above, the present invention is not limited to this.
For example, the regulating valve is not limited to the pressure reducing valve having the above-described configuration, and the drive unit 2 has a rubber diaphragm 17.
As long as it is a self-contained regulating valve that uses a spring or the like provided in the drive unit 2, it may be a pressure reducing valve of another configuration, and is not limited to a pressure reducing valve, It may be a pressure adjusting valve (vacuum adjusting valve, back pressure valve, differential pressure valve, etc.), temperature adjusting valve, flow rate adjusting valve, liquid level adjusting valve and the like.
Further, the shape of the spring cover 26 is also appropriate. In particular, the inner wall on which the barrier 34 is formed does not have to be tapered, and a protrusion 35 that forms the barrier 34 may be formed according to the shape. It may not be horizontal with respect to the convolution unit 17a.
In short, when the drive unit 2 is equipped with a rubber diaphragm 17 and a self-supporting regulating valve using a spring or the like provided in the drive unit 2, when an abnormal pressure is applied to the diaphragm 17, it receives that pressure and a spring cover The convolution part 17a that deforms abnormally toward the 26th side may be configured to touch the barrier 34 and prevent excessive abnormal deformation of the convolution part 17a.

Next, the operation of the regulating valve according to the present invention will be described.
Since the regulating valve shown in FIGS. 1 to 3 is a pressure reducing valve, when the regulating valve functions normally, the secondary pressure and the upward force (opening direction) on the diaphragm 17 by the valve body spring 19 When the downward force (opening direction) by the adjusting spring 18 is balanced, the opening degree of the valve body 15 is automatically controlled, and the secondary pressure is maintained at a certain pressure lower than the primary pressure.
In such a state, the diaphragm 17 is normally displaced, and within the displacement, the top portion 17b of the convolution portion 17a does not contact the barrier 34, and thus wear due to the contact of the top portion 17b with the barrier 34 occurs. There is no fear.

In the unlikely event that a foreign object is caught between the valve body 15 and the valve seat 14 and the valve body 15 cannot be closed, the secondary pressure and the primary pressure in the valve box 1 will be reduced. The pressure becomes the same pressure, the pressure exceeds the pressure set by the adjustment spring 18, and the abnormal pressure acts on the pressure receiving surface S of the secondary side pressure of the diaphragm 17.
As a result, in the diaphragm 17, the convolution part 17a, which is deformable because it is displaced, abnormally bulges and deforms toward the spring cover 26 due to its elastic characteristics.
As shown by the two-dot chain line in FIG. 3, the convolution unit 17a in this initial abnormal deformation does not further abnormally deform when it touches the barrier 34, and excessive abnormal deformation is prevented.
The diaphragm 17 is prevented from being damaged.

When this state is described in detail, the progress of the abnormal deformation of the convolution part 17a is first uniformly made around the top part 17b and gradually around the top part 17b gradually bulging and deforming,
Excessive abnormal deformation is stopped by touching the barrier 34 sequentially from the top 17b to the periphery thereof.
Therefore, as the deformation of the convolution portion 17a due to the contact with the barrier 34 progresses, the effective pressure receiving diameter between the top portions 17b of the convolution portion 17a in the diametrical direction of the diaphragm 17 when the regulating valve is normal and when an abnormal pressure breaks out. What is D gradually shifts to the center side of the diaphragm 17, and finally the effective pressure receiving diameter D becomes the same diameter as the spring receiver 23.
In this way, by suppressing excessive abnormal deformation of the convolution part 17a by the barrier 34, the effective pressure receiving area corresponding to the effective pressure receiving diameter D of the diaphragm 17 becomes gradually smaller than the initial occurrence of the abnormal pressure. As the effective pressure receiving area is reduced, the load received by the diaphragm 17 is naturally reduced. As a result, not only the diaphragm 17 but also the diaphragm of the valve stem 16, the valve body 15, etc.
The load due to abnormal pressure on the 17 peripheral components will be reduced.

It is a longitudinal cross-sectional view of a regulating valve. It is a partially broken side view of an adjustment valve. It is a principal part expanded sectional view.

Explanation of symbols

2 Drive unit
17 Diaphragm
17a Convolution Department
34 Barrier

Claims (2)

A regulating valve that uses a rubber diaphragm as a driving part, and when a pressure exceeding the pressure set in the driving part acts on the diaphragm, a barrier that prevents the convolution part of the diaphragm from deforming abnormally, A regulating valve provided on the abnormally deforming side of the diaphragm. 2. The regulating valve according to claim 1, wherein the barrier is set so as not to contact the convolution part in a state where the regulating valve functions normally.

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