JP2002250452A - Diaphragm valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a diaphragm valve which suppresses clogging of due to impurities such as dust, in a breed hole and surely carries out the operation of an opening and a closing action. SOLUTION: This diaphragm valve 10 is equipped with a casing 20 with a primary-side channel 22 and a secondary-side channel 24, a diaphragm 30 which is interposed between the primary-side channel and the secondary-side channel and connects the primary-side channel to the secondary-side channel with an opening valve and shuts them with a closing valve, and a pressure chamber 50, which opens or closes the diaphragm valves using the pressure in the primary-side channel and a breed hole 50, which passes through the primary-side channel and the pressure room and introduces the pressure in the primary chamber, equips a channel cross-sectional area 40a with a small diameter which has a specified channel cross-sectional area to control the diaphragm to carry out specified action and a larger channel cross-sectional area 40b with a diameter larger than that of the channel cross-sectional area with small diameter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casing provided with a primary side flow path and a secondary side flow path, a primary side flow path and a secondary side flow path interposed between the primary side flow path and the secondary side flow path. A diaphragm that communicates with the side flow path by opening and shuts off by closing the valve, a pressure chamber that opens or closes the diaphragm using the pressure of the primary flow path, and a primary flow path and a pressure chamber. The present invention relates to a diaphragm valve provided with a bleed hole for communicating the pressure of a primary side flow path into a pressure chamber.

[0002]

2. Description of the Related Art Conventionally, as a diaphragm valve of this kind,
For example, the details found in JP-A-10-325486 are as follows. The diaphragm valve is a casing having a primary flow path and a secondary flow path, and is interposed between the primary flow path and the secondary flow path to open the primary flow path and the secondary flow path. A diaphragm that is communicated and closed by closing the valve, a pressure chamber that opens or closes the diaphragm using the pressure of the primary flow path, and a primary flow path that communicates with the primary flow path and the pressure chamber. A bleed hole for introducing pressure into the pressure chamber, and the closing of the diaphragm valve is performed by introducing the pressure of the primary flow path into the pressure chamber and seating the diaphragm on the valve seat of the primary flow path. . Since the size of the bleed hole affects the closing speed of the diaphragm valve, it is set in consideration of the size of the diaphragm valve and the pressure and viscosity of the fluid in the primary flow path.

[0003]

However, in the conventional diaphragm valve, when the shape of impurities such as dust contained in the fluid flowing through the diaphragm valve is not spherical, impurities such as dust flowing into the bleed hole together with the fluid are bleed. There is a problem that the bleed hole is rotated in the hole and clogged in the bleed hole, and the operation of closing and opening the valve is not reliably performed. The present invention
The present invention has been made to solve the above-described problems, and an object of the present invention is to suppress clogging of impurities such as dust contained in a fluid flowing in a diaphragm valve into a bleed hole, and to reliably perform operations of closing and opening a valve. The purpose of the present invention is to provide a diaphragm valve.

[0004]

Means for Solving the Problems and Action / Effect To solve the above-mentioned problems, the invention according to claim 1 comprises a casing having a primary side flow path and a secondary side flow path; A diaphragm interposed between a flow path and the secondary flow path, communicating the primary flow path and the secondary flow path by opening a valve and shutting off by closing the valve, and utilizing the pressure of the primary flow path And a bleed hole for communicating the primary side flow path with the pressure chamber and introducing the pressure of the primary side flow path into the pressure chamber. Wherein the bleed hole has a small-diameter flow passage cross-sectional area having a predetermined flow cross-sectional area for controlling the diaphragm to perform a predetermined operation; Diameter section The features. By doing so, the entire bleed hole is no longer the cross-sectional area of the small-diameter flow path, so that impurities such as dust contained in the fluid flowing through the diaphragm valve easily pass through the bleed hole, and the impurities such as dust enter the bleed hole. Clogging can be suppressed, so that the operation of closing and opening the diaphragm valve is reliably performed.

According to a second aspect of the present invention, there is provided a casing having a primary side flow path and a secondary side flow path, and a casing interposed between the primary side flow path and the secondary side flow path. A diaphragm that connects the side flow path and the secondary flow path by opening and shuts off by closing the valve, and a pressure chamber that opens or closes the diaphragm using the pressure of the primary flow path, A bleed hole that communicates the primary flow path with the pressure chamber and introduces the pressure of the primary flow path into the pressure chamber, and a cleaning pin that is inserted into the bleed hole and removes impurities deposited in the bleed hole. A small-diameter flow passage cross-sectional area having a predetermined flow cross-sectional area for controlling the diaphragm to perform a predetermined operation, and a flow passage of the small-diameter flow cross-sectional area. Larger than cross-sectional area Characterized in that it comprises a have large diameter flow path cross-sectional area portion. By doing so, since the entire bleed hole is not a small-diameter flow path cross-sectional area, impurities such as dust contained in the fluid flowing through the diaphragm valve easily pass through the bleed hole, and the small-diameter flow path of the cleaning pin is cut off. The contact with the area is relatively easy to spread over the entire small-diameter flow path cross-sectional area. This makes it possible to prevent impurities such as dust from clogging the bleed hole, so that the operation of closing and opening the diaphragm valve is ensured.

In a preferred aspect of the present invention, the large-diameter flow path cross-sectional area is tapered in a direction away from the small-diameter flow path cross-sectional area. By doing so, the flow of the fluid flowing in the bleed hole is stabilized, and the operation of the diaphragm valve becomes smooth. Also, the formability of the bleed hole is improved.

Further, in a preferred embodiment of the present invention,
The small-diameter flow path cross-sectional area is provided near a communication part with the primary flow path or near a communication part with the primary flow path. By doing so, if impurities such as dust contained in the fluid flowing through the diaphragm valve do not pass through the bleed hole, the bleed hole communicates with the primary flow path or near the communication part with the primary flow path. Because it becomes easy to clog,
Cleaning of the bleed hole becomes easy.

[0008] In a preferred embodiment of the present invention,
A cross-sectional shape of the small-diameter flow path cross-sectional area is circular. By making the cross-sectional shape of the small-diameter flow path cross-sectional area circular, the flow of the fluid flowing in the bleed hole is stabilized, so that the operation of the diaphragm valve becomes smooth. Also, the formability of the bleed hole is improved.

In a preferred aspect of the present invention, a length dimension of the small-diameter flow path cross-sectional area is substantially equal to or less than a cross-sectional diameter of the small-diameter flow path cross-sectional area. . By doing so, impurities such as dust easily pass through the bleed hole regardless of the shape of impurities such as dust contained in the fluid flowing through the diaphragm valve, so that the diaphragm valve can be more reliably closed or opened. Is performed.

[0010] In a preferred embodiment of the present invention,
The bleed hole is formed in the diaphragm. By doing so, the formability is improved as compared with the case where a bleed hole is formed in the casing.

[0011] In a preferred embodiment of the present invention,
The flow path area of the small-diameter flow path cross-sectional area is a flow path area for suppressing a water hammer generated when the diaphragm is closed. By doing so, the occurrence of water hammer is suppressed, and the risk of damage to the primary-side piping path is reduced.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front sectional view showing an open state of a diaphragm valve according to a first embodiment, FIG. 2 is an enlarged sectional view of the diaphragm according to the first embodiment, and FIG. 3 is a sectional view of the diaphragm according to the first embodiment. FIG. 4 is a front sectional view showing a closed state of the diaphragm valve according to the first embodiment.

In FIG. 1, a diaphragm valve 10 includes a casing 2 having a primary flow path 22 and a secondary flow path 24.
0, a diaphragm 30 interposed between the primary side flow path 22 and the secondary side flow path 24 to connect the primary side flow path 22 and the secondary side flow path 24 by opening and to shut off by closing the valve;
A bleed hole 40 formed in the diaphragm 30, a pressure chamber 50 for opening or closing the diaphragm 30 using the pressure of the primary flow path 22, and a pilot hole for discharging fluid in the pressure chamber 50 52, and a pilot valve 54 for opening and closing the pilot hole 52.

The casing 20 has a double pipe structure having a primary flow path 22 outside a secondary flow path 24, and is integrally formed of polyacetal resin. Secondary channel 2
4 has a valve seat 24a on which the diaphragm 30 is seated.
Are formed.

In FIG. 2 and FIG.
Numeral 0 denotes a valve body 32 and a valve body 3 having a disc shape made of synthetic rubber.
2 is constituted by a diaphragm holder 36 made of polyacetal resin having a substantially cylindrical shape with a bottom and a cross section fitted therein.
The outer periphery 32 a of the valve body 32 is held in the casing 20 by being sandwiched between the casing 20 and the pressure chamber 50. The valve portion 32b of the valve body 32 has a larger diameter than the valve seat 24a, and shuts off the primary flow path 22 and the secondary flow path 24 by sitting on the upper part of the valve seat 24a. A movable portion 32c having a substantially U-shaped cross section, which is thinner than the outer periphery 32a and the valve portion 32b, is formed between the outer periphery 32a and the valve portion 32b.

The bleed hole 40 is a through hole for communicating the primary side flow path 22 and the pressure chamber 50, and is formed in the diaphragm 30. The bleed hole 40 has a small-diameter flow passage cross-sectional area 40a having an effective flow passage area S narrowed to a degree of suppressing a water hammer generated when the diaphragm 30 is closed on the communication portion 42 side with the primary flow passage 22. And a tapered large-diameter flow path cross-sectional area 40b that expands from the small-diameter flow path cross-sectional area 40a toward the pressure chamber 50 side. The length of the small-diameter flow passage cross-sectional area 40a is substantially the same as the diameter D of the effective flow passage area S from the communication portion 42 with the primary side flow passage 22 of the small-diameter flow passage cross-sectional area 40a. .

If the flow passage area of the bleed hole 40 is too large, the fluid easily flows into the pressure chamber 50.
The pressure in 0 also tends to increase, and the diaphragm 30 closes suddenly. As a result, a water hammer is generated. If the flow passage area of the bleed hole 40 is too small, it becomes difficult for the fluid to flow into the pressure chamber 50,
The internal pressure is also hard to increase, and the closing of the diaphragm 30 is delayed. Therefore, the size of the effective flow path area S is set in consideration of the size of the diaphragm valve 10 and the pressure and viscosity of the fluid in the primary flow path 22.

With the bleed hole 40 having the above configuration,
Since impurities such as dust contained in the fluid flowing through the diaphragm valve 10 easily pass through the bleed hole 40,
Suppresses clogging of impurities such as dust into the bleed hole 40,
The operation of closing and opening the diaphragm valve 10 is reliably performed, and the flow of the fluid flowing through the bleed hole 40 is stabilized, so that the operation of the diaphragm valve 10 becomes smooth. Also, the formability of the bleed hole 40 is improved. Further, even when the bleed hole 40 is clogged with impurities such as dust, the communication portion 42 with the primary side flow path 22 of the bleed hole 40 is formed.
, So that the bleed hole 40 can be easily cleaned.

Returning to FIG. 1, the pressure chamber 50 is provided at a position facing the casing 20 via the diaphragm 30. The pressure chamber 50 has a pilot hole 52 and a pilot valve 54 for opening and closing the pilot hole 52 at the upper part.

Next, the operation of the diaphragm valve 10 will be described. In the state of FIG. 1, the valve element 32 of the diaphragm 30 is separated from the valve seat 24 a formed at the inflow end of the secondary flow path 24, and the primary flow path 22 and the secondary flow path 24 are separated from each other. Have been contacted. For this reason, a part of the fluid in the primary channel 22 flows through the bleed hole 40 to the pressure chamber 50, and most of the remaining fluid flows to the secondary channel 24. The fluid that has flowed into the pressure chamber 50 passes through the pilot hole 52 and is discharged outside the diaphragm valve 10.

The bleed hole 40 is narrowed to a distance equivalent to the diameter D of the effective flow passage area S from the communication portion 42 with the primary flow passage 22 to such an extent that a water hammer generated when the diaphragm 30 is closed is suppressed. And a small-diameter flow passage cross-sectional area 40a having an effective flow passage area S.
In the case where a part of the fluid in the primary side flow path 22 flows into the bleed hole 40, impurities such as dust contained in the fluid will
0, so that impurities such as dust can be prevented from clogging the bleed hole 40, and the diaphragm valve 1
The operation of closing and opening the valve of 0 is reliably performed.

Since the flow passage area of the pilot hole 52 is configured to be larger than the flow passage area of the bleed hole 40 due to the nature of the diaphragm valve 10, impurities such as dust which have flowed into the pressure chamber 50 together with the fluid are also reduced. It is discharged from the pilot hole 52 to the outside of the diaphragm valve 10.

When the pilot hole 52 is closed by the pilot valve 54, the fluid that has flowed into the pressure chamber 50 is not discharged from the pressure chamber 50, so that the fluid accumulates in the pressure chamber 50 and at the same time the primary side flow flows into the pressure chamber 50. Apply pressure in channel 22. When the pressure in the pressure chamber 50 becomes larger than the pressure of the fluid flowing from the primary flow path 22 to the secondary flow path 24, the movable portion 32c of the diaphragm 30 is deformed, and the valve body 32 is moved as shown in FIG. The user sits on the seat 24a and shuts off the primary channel 22 and the secondary channel 24. As a result, the fluid in the primary flow path 22 is stopped from flowing into the secondary flow path 24.

At this time, the effective flow area S of the bleed hole 40
Is set in consideration of the size of the diaphragm valve 10 and the pressure and viscosity of the fluid in the primary flow path 22, so that the diaphragm 30 closes at such a speed that water hammer is suppressed. I do.

Next, another embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a front sectional view showing a closed state of a diaphragm valve according to another embodiment.

In FIG. 5, the diaphragm valve 10 is provided with a casing 2 having a primary flow path 22 and a secondary flow path 24.
0, a diaphragm 30 interposed between the primary side flow path 22 and the secondary side flow path 24 to connect the primary side flow path 22 and the secondary side flow path 24 by opening and to shut off by closing the valve;
A bleed hole 40 formed in the diaphragm 30, a cleaning pin 60 inserted through the bleed hole 40, a pressure chamber 50 for opening or closing the diaphragm 30 using the pressure of the primary flow path 22, A pilot hole 52 for discharging the fluid in the chamber 50 and a pilot valve 54 for opening and closing the pilot hole 52 are provided.

The cleaning pin 60 is made of a stainless steel wire having a circular cross section bent into an L shape, and
The casing 20 on the 0 side is assembled by insert molding. Note that the length of the cleaning pin 60 is set to a length that always passes through the bleed hole 40 regardless of the state of the valve opening and closing of the diaphragm 30.

The bleed hole 40 has a small-diameter flow path cross-sectional area 40a on the primary flow path 22 side and a tapered large-diameter flow path cross-sectional area expanding from the small-diameter flow path cross-sectional area 40a toward the pressure chamber 50 side. 40b. The small-diameter flow path cross-sectional area 40a has a cross-sectional area obtained by subtracting the cross-sectional area of the cleaning pin 60 from the cross-sectional area of the small-diameter flow path cross-sectional area 40a, and is reduced to such an extent that water hammer generated when the diaphragm 30 is closed is suppressed. It is set so that the effective flow path area S can be obtained. The length of the small-diameter flow passage cross-sectional area 40a is substantially the same as the diameter of the small-diameter flow passage cross-sectional area 40a.

The cleaning pin 60 is inserted substantially at the center of the bleed hole 40. The diaphragm 30 opens and closes vertically with respect to the valve seat 24a due to the shape of the diaphragm 30 and the pressure fluctuation of the fluid in the diaphragm valve 10. Since the valve is not opened, the opening and closing of the diaphragm 30 are performed while the bleed hole 40 contacts the cleaning pin 60. As a result, impurities such as dust accumulated in the bleed hole 40 are removed.

In this embodiment, the description of the filter for capturing impurities such as dust contained in the fluid disposed on the primary side of the bleed hole 40 is omitted. Clogging of the bleed hole 40 with the impurities can be suppressed. As a specification of the filter in this case, a mesh finer than the effective channel area S of the bleed hole 40 is preferable.

Further, in order to stabilize the valve closing speed of the diaphragm 30, the synthetic rubber valve element 3 which is easily deformed is used.
It is preferable to provide the diaphragm receiver 36 made of a polyacetal resin, which is relatively less deformable than that of the second embodiment, with the small-diameter flow path cross-sectional area 40a.

As an application example of the present invention, there is a valve in a ball tap incorporated in a toilet flush tank device for supplying flush water to a toilet. When applied to a ball tap, the pilot valve 54 is desirably connected to the float of the ball tap by a link mechanism.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing an open state of a diaphragm valve according to a first embodiment.

FIG. 2 is an enlarged cross-sectional view of the diaphragm according to the first embodiment.

FIG. 3 is a top view of the diaphragm according to the first embodiment.

FIG. 4 is a front sectional view showing a closed state of the diaphragm valve according to the first embodiment.

FIG. 5 is a front sectional view showing a closed state of a diaphragm valve according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Diaphragm valve 20 ... Casing 22 ... Primary side flow path 24 ... Secondary side flow path 24a ... Valve seat 30 ... Diaphragm 32 ... Valve element 32a ... Outer periphery 32b ... Valve part 32c ... Movable part 36 ... Diaphragm receiver 40 ... Bleed hole 40a: small-diameter flow path cross-sectional area 40b: large-diameter flow path cross-sectional area 42: communication section 50: pressure chamber 52: pilot hole 54: pilot valve 60: cleaning pin S: effective flow area D: diameter

Claims (8)

[Claims] A casing provided with a primary flow path and a secondary flow path; and a primary flow path and a secondary flow path interposed between the primary flow path and the secondary flow path. A diaphragm that communicates with the path by opening the valve and shuts off by closing the valve;
A pressure chamber that opens or closes the diaphragm using the pressure of the primary flow path, communicates the primary flow path and the pressure chamber, and introduces the pressure of the primary flow path into the pressure chamber. A diaphragm valve with a bleed hole
The bleed hole has a small-diameter channel cross-sectional area having a predetermined channel cross-sectional area for controlling the diaphragm to perform a predetermined operation, and a large-diameter channel larger than the channel cross-sectional area of the small-diameter channel cross-sectional area. A diaphragm valve, comprising: a cross-sectional area. 2. A casing provided with a primary side flow path and a secondary side flow path, and the primary side flow path and the secondary side flow path interposed between the primary side flow path and the secondary side flow path. A diaphragm that communicates with the path by opening the valve and shuts off by closing the valve;
A pressure chamber that opens or closes the diaphragm using the pressure of the primary flow path, communicates the primary flow path and the pressure chamber, and introduces the pressure of the primary flow path into the pressure chamber. A bleed hole, and a cleaning pin that is inserted into the bleed hole and removes impurities accumulated in the bleed hole, wherein the bleed hole has a predetermined shape for controlling the diaphragm to perform a predetermined operation. A small-diameter channel cross-sectional area portion having a channel cross-sectional area,
A large-diameter passage cross-sectional area that is larger than the passage cross-sectional area of the small-diameter passage cross-sectional area. 3. The large-diameter flow path cross-sectional area has a shape that is tapered and widened in a direction away from the small-diameter flow path cross-sectional area. Diaphragm valve. 4. The method according to claim 1, wherein the small-diameter flow path cross-sectional area is provided near a communication part with the primary flow path or near a communication part with the primary flow path. The described diaphragm valve. 5. The diaphragm valve according to claim 1, wherein a cross-sectional shape of the small-diameter flow path cross-sectional area is circular. 6. The diaphragm valve according to claim 5, wherein a length dimension of the small-diameter passage cross-sectional area is substantially equal to or less than a cross-sectional diameter of the small-diameter passage cross-sectional area. . 7. The diaphragm valve according to claim 1, wherein the bleed hole is formed in the diaphragm. 8. The flow path area of the small-diameter flow path cross-sectional area is a flow path area for suppressing a water hammer generated when the diaphragm is closed. 2. The diaphragm valve according to 1.