JPH059571Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a diaphragm valve, and is particularly applicable to a relief type pressure reducing valve that discharges increased fluid pressure in a secondary flow path to the outside from a discharge port. Concerning effective techniques.

[Prior Art] An example of a diaphragm valve that uses a diaphragm in a fluid pressure receiving portion or a fluid passage portion is a relief type pressure reducing valve.

For example, such a relief type pressure reducing valve includes a main valve interposed between the primary flow path and the secondary flow path, an exhaust valve integrally connected to the diaphragm, and a main valve interposed between the primary flow path and the secondary flow path. Some valves have a structure that includes an exhaust port that communicates with the secondary flow path through the relief hole of the valve.

In this pressure reducing valve, the exhaust valve, which had been in contact with the main valve to close the relief hole, is released from the main valve due to the displacement of the diaphragm when the fluid pressure in the secondary flow path increases. A hole is opened, and surplus fluid pressure in the secondary flow path is discharged to the outside from the exhaust port through the relief hole.

[Problem to be solved by the invention] By the way, the above-described pressure reducing valve has a problem in that when the high-pressure surplus fluid pressure in the secondary flow path is discharged to the outside from the exhaust port, the pulsating flow of the surplus fluid pressure Vibration occurs in the diaphragm and noise is generated.

Normally, such vibration of the diaphragm is prevented by sliding friction such as an O-ring fitted to the exhaust valve, but this structure has poor response and insufficient vibration-proofing effect. There is a problem that.

An object of the present invention is to provide a diaphragm valve that can reliably prevent diaphragm vibration and noise caused by the action of fluid pressure.

[Means for Solving the Problems] The structure of the diaphragm valve of the present invention is such that a balance weight that damps the vibration of the diaphragm is provided on the diaphragm in a movable state.

In this case, it is effective to adopt a structure in which the diaphragm and the balance weight have approximately the same mass.

[Function] According to the above-described means, the vibration of the diaphragm caused by the action of fluid pressure is damped by the balance weight movably provided on the diaphragm, so that the vibration of the diaphragm and this vibration are damped. accompanying noise can be prevented.

In this case, if the diaphragm and the balance weight are constructed to have substantially the same mass, vibration of the diaphragm and noise accompanying this vibration can be reliably prevented.

[Embodiment] FIG. 1 is a sectional view showing a diaphragm valve that is an embodiment of the present invention.

The diaphragm valve in this embodiment is applied to a pressure reducing valve.

The main body 1 of the pressure reducing valve has primary flow passages 1 on both sides thereof.
A and a secondary flow path 1b are opened to face each other, and the primary flow path 1a and the secondary flow path 1b are connected to a fluid pressure source (not shown) such as a predetermined compressed air and a fluid pressure device ( (not shown).

Further, a plug 2 with an exhaust port 2a is screwed into the lower part of the main body 1, and inside this plug 2,
A cylindrical guide portion 2b is formed.

The main valve 3 is formed by inserting an upper member 3b into a lower member 3a, and the main valve 3 is formed with a relief hole 3c passing through the main valve 3 along its axial direction.

The lower end portion of the main valve 3 is slidably inserted into the guide portion 2b of the plug 2.

Furthermore, the main valve 3 is biased toward the valve seat 5 in the main body 1 by a spring 4 fitted around the outer periphery of the guide portion 2b, and the gap between the main valve 3 and the valve seat 5 is Due to the change in
The structure is such that the fluid pressure flowing through the pump is reduced to a predetermined pressure.

A pilot member 6 is fixed to the upper part of the main body 1, and a main valve diaphragm 7 is interposed between the main body 1 and the pilot member 6.

The diaphragm 7 is clamped and fixed at its outer circumference by the joint between the main body 1 and the pilot member 6, and the diaphragm 7 connects the secondary flow path 1b on the main body 1 side and the fluid chamber on the pilot member 6 side. It is separated from 6a.

As shown in FIG. 1, the lower central portion of the diaphragm 7 is removably abutted against the upper opening edge of the relief hole 3c of the main valve 3 to close the relief hole 3c.

When the diaphragm 7 is displaced below the position shown in FIG. 1, it maintains the contact state with the main valve 3 and closes the relief hole 3c.
Although it is displaced together with the main valve 3, when it is displaced above the position shown in FIG. 1, it is separated from the main valve 3 and displaced independently to open the relief hole 3c.

Further, the diaphragm 7 has a structure including a metal fitting 8, and the metal fitting 8 is fixed to a recessed portion of the upper surface of the diaphragm 7 by baking or the like.

The metal fitting 8 includes a disk-shaped mounting portion 8a and this mounting portion 8.
It is formed from a cylindrical guide portion 8b that integrally projects from the central portion of the guide portion 8a.

A retaining ring 10 is fitted onto the upper portion of the outer peripheral surface of the guide portion 8b.

Furthermore, a ring disc-shaped balance weight 9 made of metal such as brass is movably provided above the diaphragm 7, and this balance weight 9 is approximately parallel to the diaphragm 7 (the diaphragm 7 including the metal fittings 8). assumed to have the same mass.

The guide part 8b of the metal fitting 8 is loosely inserted into the center hole 9a of the balance weight 9, and the balance weight 9 is attached to and detached from the annular part 7a of the outer periphery of the diaphragm 7 with a space between the guide part 8b of the metal fitting 8 and the upper surface of the mounting part 8a of the metal fitting 8. The annular portion 7a is freely brought into contact with the retaining ring 10, and is freely movable between the annular portion 7a and the retaining ring 10.

In the pilot member 6, there is a primary flow path 1.
A pilot flow path 6 that communicates between a and the fluid chamber 6a.
b is formed.

A pilot valve seat 11a is formed in the middle of the pilot flow path 6b, and a pilot valve seat 11a is formed in the middle of the pilot flow path 6b.
is mediated.

The pilot valve 11 has a pilot valve spring 11.
b is urged toward the pilot valve valve seat 11a, and a relief valve 12 is formed above the pilot valve 11.

A bonnet 13 is fixed to the upper part of the pilot member 6, and between the bonnet 13 and the pilot member 6 is a pilot diaphragm 14 whose outer peripheral portion is held and fixed between the bonnet 13 and the pilot member 6.
is mediated.

The diaphragm 14 has a diaphragm sheet 1
5 is formed, and the diaphragm sheet 15 is urged downward in FIG. 1 by a pressure regulating spring 16 within the bonnet 13.

A relief hole 15a is formed through the center of the diaphragm sheet 15, and the relief hole 15a is closed by the relief valve 12 being removably abutted on the lower center of the diaphragm sheet 15. ing.

When the diaphragm 14 and the diaphragm seat 15 are displaced below the position shown in FIG. Although it is displaced together with the valve 11, when it is displaced above the position shown in FIG. 1, it is separated from the relief valve 12 and displaced independently to open the relief hole 15a.

Further, when the relief hole 15a is opened in this way, the fluid pressure in the fluid chamber 6a is increased to the relief hole 15a.
It is designed to be discharged into the bonnet 13 from the bonnet 13 through the bleed hole 13a opened on the left side of the bonnet 13, and to the outside through the bleed hole 13a opened on the left side of the bonnet 13.

The pressure regulating spring 16 inside the bonnet 13 has its upper end supported by a spring seat 17 inside the bonnet 13.

The spring seat 17 is screwed onto a pressure regulating screw 18, which is rotatably supported by the bonnet 13.

The upper end of the pressure adjusting screw 18 penetrates through the bonnet 13 and protrudes to the outside and is fixed to a handle 19. By rotating the handle 19 in a predetermined direction, the spring seat 17 is moved in the vertical direction in FIG. The structure is such that the biasing force of the pressure regulating spring 16 against the diaphragm sheet 15 is changed by being displaced.

Next, the operation of this embodiment will be explained.

First, when the handle 19 is appropriately rotated in a predetermined direction and the spring 17 is moved in a direction approaching the diaphragm seat 15, the diaphragm seat 1 is moved against the biasing force of the pilot valve spring 11b.
4, the pilot valve 11, etc. are pushed down, and the pilot valve 11 is separated from the pilot valve valve seat 11a.

Pilot valve valve seat 1 of this pilot valve 11
Due to the separation from 1a, fluid pressure such as compressed air in the primary flow path 1a flows into the fluid chamber 6a through the pilot flow path 6b.

The fluid pressure flowing into the fluid chamber 6a side acts on the lower surface side of the diaphragm 14 and is stabilized at a position balanced with the biasing force of the pressure regulating spring 16.

That is, the fluid pressure in the fluid chamber 6a is stabilized at the set pressure set by the pressure regulating spring 16 due to the displacement of the diaphragm 14 and the accompanying displacement of the pilot valve 11 and relief valve 12.

On the other hand, the fluid pressure flowing into the fluid chamber 6a also acts on the upper surface of the diaphragm 7, and the diaphragm 7 is displaced downward from the position shown in FIG. 1 against the biasing force of the spring 4. The main valve 3 is accompanied by this displacement, and the relief hole 3 is moved by the diaphragm 7.
c is pressed down in the closed state, and the main valve 3 is separated from the valve seat 5.

Then, the fluid pressure in the primary flow path 1a is reduced to a predetermined pressure and flows out from between the main valve 3 and the valve seat 5 toward the secondary flow path 1b.

In this case, the fluid pressure on the secondary side flow path 1b side is applied to the lower surface side of the diaphragm 7, and the main valve 3 is opened at a position where the fluid pressure in the fluid chamber 6a acting on the upper surface side of the diaphragm 7 is balanced. The level is stabilized.

When the fluid pressure on the secondary flow path 1b side rises above the set pressure, the diaphragm 7, which had been pushed down, is displaced to the position shown in FIG. 1 by the action of the fluid pressure. The main valve 3 is brought into close contact with the valve seat 5 by the biasing force of the spring 4 due to this displacement of the diaphragm 7, and the space between the main valve 3 and the valve seat 5 is closed. The relief hole 3c is opened by the relief hole 3c, and the increased excess fluid pressure on the secondary flow path 1b side is discharged to the outside from the exhaust port 2a through the relief hole 3c.

When this surplus fluid pressure is discharged to the outside, vibrations are generated in the diaphragm 7 due to the pulsating flow of the high-pressure surplus fluid pressure.

In this embodiment, when the diaphragm 7 vibrates, the balancer weight 9
The weight of the balancer weight 9 provides a secondary delay to the vibration of the diaphragm 7 and damps it.
vibration and the noise accompanying this vibration are prevented.
Further, in this embodiment, since the diaphragm 7 and the balance weight 9 have substantially the same mass, vibration and noise of the diaphragm 7 are reliably prevented.

Moreover, in this embodiment, the vibration of the diaphragm 7 is prevented by a simplified structure in which the balance weight 9 is provided in a movable state on the diaphragm 7, so that the cost can be reduced. Accordingly, the vibration damping effect of the diaphragm 7 can be obtained.

Next, as described above, when the excess fluid pressure on the secondary side fluid 1b side is discharged to the outside and the fluid pressure on the secondary side flow path 1b side reaches a predetermined set pressure, the diaphragm 7
Then, the main valve 3 is pushed down again by the action of the fluid pressure in the fluid chamber 6a, and the fluid pressure in the primary flow path 1a is transferred from between the main valve 3 and the valve seat 5 to the secondary flow path 1.
b.

In this embodiment, the fluid pressure on the secondary side flow path 1b side is maintained at a predetermined set pressure in this way, but in this case, the diaphragm 7 of this embodiment
When the excess fluid pressure on the secondary side flow path 1b side is discharged to the outside, the diaphragm is detached from the main valve 3 and is displaced independently, so that it is not subjected to sliding resistance of the main valve 3. 7, and through this miniaturization, the entire pressure reducing valve can be made smaller, and the discharge characteristics of the increased fluid pressure in the secondary flow path can be improved.

Furthermore, since no other member such as an exhaust valve is interposed between the main valve 3 and the diaphragm 7, the structure can be simplified.

Furthermore, by downsizing and simplifying the structure described above, it is possible to reduce the cost of the pressure reducing valve.

Although the present invention has been specifically explained above based on the embodiments, the present invention is not limited to the embodiments, and can be modified in various ways without departing from the gist thereof.

For example, the diaphragm valve of the present invention is not limited to the pressure reducing valve applied to this embodiment.

[Effects of the invention] According to the structure of the diaphragm valve of the invention, the following effects can be obtained.

(1) The vibration of the diaphragm caused by the action of fluid pressure is damped by the balance weight movably attached to the diaphragm.
Vibration of the diaphragm and noise accompanying this vibration can be prevented.

In this case, if the diaphragm and the bass weight are constructed to have substantially the same mass, vibration of the diaphragm and noise accompanying this vibration can be reliably prevented.

(2) The effect of (1) above is achieved by the simplified structure in which the balance weight is movably provided on the diaphragm.
The vibration-proofing effect of the diaphragm can be achieved at low cost.

(3) Due to the effect of (1) described above, it is possible to improve the operational reliability and durability of the diaphragm valve.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a diaphragm valve which is an embodiment of the present invention. 1...Main body, 1a...Primary side flow path, 1b...Secondary side flow path, 2...Plug, 2a...Exhaust port, 2b
...Guiding part, 3...Main valve, 3a...Lower member, 3
b...Upper member, 3c...Relief hole, 4...Spring, 5...Valve seat, 6...Pilot member, 6a
...Fluid chamber, 6b... Pilot channel, 7... Diaphragm, 7a... Annular part, 8... Metal fitting, 8a
...Mounting part, 8b...Guiding part, 9...Balance weight, 9a...Central hole, 10...Retaining ring, 11
... Pilot valve, 11a ... Valve seat for pilot valve, 11b ... Spring for pilot valve, 12 ... Relief valve, 13 ... Bonnet, 13a ... Bleed hole, 14 ... Diaphragm, 15 ... Diaphragm seat, 15a... Relief hole, 16...
Pressure adjustment spring, 17...Spring seat, 18...
Pressure adjustment screw, 19...handle.

Claims (1)

[Claims of Utility Model Registration] 1. A diaphragm valve characterized in that a balance weight for damping the vibration of the diaphragm is provided in a movable state on the diaphragm. 2. The diaphragm valve according to claim 1, wherein the diaphragm and the balance weight have substantially the same mass.