JPH06117553A - Diaphragm valve - Google Patents

Abstract

PURPOSE:To provide a diaphragm valve which is improved so as to prevent the blockade of a small hole. CONSTITUTION:A strainer 50 is fitted attachably/detachably to the small hole 36 of a diaphragm valve. This strainer 50 is equipped with a body portion; plural legs 54 (4 legs in this working example); claw portions 56 provided at the tips of the legs 54; plural blades 58 (4 blades in this working example) projectingly provided from the body portion in an opposite direction to the legs 54; a water-passing hole 60 penetratingly provided at the body portion in the longitudinal direction of the drawing; and a narrow water-passing opening 62. As a result, the blockade of the small hole 36 by a foreign substance is prevented, so the operation of opening/closing can be conducted surely over a long period of time. Also, even if the strainer 50 should be blockaded, cleaning and exchange for a new one can easily be carried out by taking off the strainer 50 alone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diaphragm valve used in an automatic water supply system, and more particularly to a diaphragm valve improved to prevent clogging of small holes.

[0002]

2. Description of the Related Art The structure of a conventional diaphragm valve and an automatic water supply system using the same will be described with reference to FIGS.

A diaphragm valve 16 is provided so as to separate an upstream water passage 12 and a downstream water passage 14 of the faucet body 10, and the diaphragm valve 16 can be seated on a valve seat 18.

The valve seat 18 has a cylindrical shape, and a disk-shaped diaphragm valve 16 is seated on the tip end surface of the valve seat 18 to close the valve. The diaphragm valve 16 is a disc-shaped member having a diameter larger than that of the valve seat 18, and the water supply pressure is constantly applied to the outer edge of the valve seat 18 protruding from the outer periphery thereof.

The diaphragm valve 16 includes a disk 20.
The diaphragm 22 and the stator 24
Is fixed to the disk 20. A plurality of legs 26 extend from the stator 24. The leg 26
Is slidably in contact with the inner peripheral surface of the tubular valve seat 18 and guides the diaphragm valve 16 when it is moving in the seating direction and in the opposite direction. The outer peripheral edge of the diaphragm 22 is sandwiched between blocks 28 and 30 forming the faucet body 10.

The back side of the diaphragm valve 16 (valve seat 1
A back pressure chamber 32 is formed on the side opposite to 8. A coil spring 34 is arranged in the back pressure chamber 32 and urges the diaphragm valve 16 in the seating direction. Diaphragm valve 16
Is a small hole 3 that connects the back pressure chamber 32 and the upstream water passage 12.
6 is provided.

The starting water passage 38, which connects the water passage 14 on the downstream side of the valve seat 18 and the back pressure chamber 32, has a diaphragm valve 1.
It is provided so as to bypass 6. This starting waterway 38
Is provided with a starting valve device 40 driven by a solenoid or the like.

When the thus constructed water supply apparatus is in a water-stopped state, the diaphragm valve 16 is pushed by the spring 34 and seated on the valve seat 18. Further, the back pressure chamber 32 is filled with water, and the water supply pressure transmitted to the back pressure chamber 32 through the small hole 36 presses the diaphragm valve 16 in this seating direction, so that the diaphragm valve 16 is closed. Is strongly pressed against. In this state, the starting valve device 40
Is closed.

When the starting valve device 40 is opened, the back pressure chamber 3
The water pressure in 2 passes through the starting water passage 38 to the water passage 14 on the downstream side of the valve seat 18. As a result, the water pressure that pushes the diaphragm valve 16 upward in FIG. 4 exceeds the pressure of the spring 34 that urges it in the opposite direction, and the diaphragm valve 1
6 moves upward in FIG. That is, the diaphragm valve 16 separates from the valve seat 18, and the diaphragm valve 16 opens. As a result, water flows from the upstream side water passage 12 toward the downstream side water passage 14 to supply water.

When the starting valve device 40 is closed in this water-flowing state, the water supply gradually passes through the small hole 36 and the back-pressure chamber 3
2, and the diaphragm valve 16 gradually moves in the seating direction. Finally, the diaphragm valve 16 is seated on the valve seat 18 and the water is stopped.

[0011]

The conventional diaphragm valve described above has a problem that the small hole 36 is easily blocked by foreign matter in the water.

It is an object of the present invention to provide a diaphragm valve which is improved to prevent the blockage of such stoma.

[0013]

The diaphragm valve according to claim 1 is a disk-shaped diaphragm valve having a small hole penetrating in the thickness direction of the disk, and a strainer is detachably attached to the small hole. It is characterized by that.

A diaphragm valve according to a second aspect of the present invention is the diaphragm valve according to the first aspect, wherein the strainer is a leg portion that is inserted into the small hole and a body portion that is arranged outside the small hole and is integral with the leg portion. And a narrow water channel provided in the body.

[0015]

In the diaphragm valve of the present invention, since the strainer is detachably attached to the small hole, the small hole is prevented from being blocked by foreign matter, and if the strainer is clogged with foreign matter, the strainer is removed and cleaned. You can easily deal with it by replacing it with a new one.

In the diaphragm valve of the second aspect, since the strainer is attached to the diaphragm valve by inserting the leg into the small hole, the strainer can be easily attached and detached.

[0017]

EXAMPLES Examples will be described below with reference to the drawings. FIG. 1 is a sectional view of a diaphragm valve according to an embodiment, and FIG. 2 is a perspective view of a strainer.

In this embodiment, the strainer 50 is detachably attached to the small hole 36 of the diaphragm valve 16. The strainer 50 includes a body portion 52, a plurality of (four in the present embodiment) legs 54 protruding from the body portion 52,
A claw portion 56 provided at the tip of the leg 54, a plurality of blades 58 (four in this embodiment) protruding from the body portion 52 in the direction opposite to the leg 54, and a body portion 52 with It is provided with a water passage hole 60 penetrating in the vertical direction. Reference numeral 62 denotes a water passage gap between the blades 58.

The other structure of FIG. 1 is the same as that of FIG. 5, and the same reference numerals indicate the same parts. In the strainer 50, if the water flowing into the small hole 36 contains a foreign matter, the foreign matter is trapped between the blades 58 and the small hole 36.
Foreign matter is prevented from flowing into.

Since the strainer 50 is removably attached to the small hole 36, if the strainer 50 is clogged with foreign matter, it can be easily dealt with by removing the strainer 50 for cleaning or replacing it with a new one.

In particular, in the diaphragm valve 16 of this embodiment, the strainer 50 is attached to the diaphragm valve 16 by inserting the leg 54 of the strainer 50 into the small hole 36 and engaging with the pawl 56. , Strainer 50
It is easy to put on and take off.

In the above embodiment, the quadrant cylindrical blade 58 is erected from the body portion 52. However, in the present invention, a narrow slit 68 is formed in the cylindrical body portion 66 like the strainer 64 of FIG.
May be provided, and the slit 68 may be used to capture the foreign matter.

[0023]

As described above, according to the diaphragm valve of the present invention, it is possible to prevent the small hole from being blocked by foreign matter in the water, so that the opening / closing operation can be reliably performed for a long period of time. Further, even if the strainer is blocked, it is possible to easily remove the strainer and clean it or replace it with a new one.

Particularly, in the diaphragm valve according to the second aspect, the strainer can be attached and detached very easily.

[Brief description of drawings]

FIG. 1 is a sectional view of a diaphragm valve according to an embodiment.

FIG. 2 is a perspective view of a strainer 50.

FIG. 3 is a perspective view of a strainer 64.

FIG. 4 is a cross-sectional view of a water supply device including a conventional diaphragm valve.

FIG. 5 is a sectional view of a conventional diaphragm valve.

[Explanation of symbols]

 10 Faucet Main Body 12 Upstream Channel 14 Downstream Channel 16 Diaphragm Valve 18 Valve Seat 22 Diaphragm 36 Small Hole 50 Strainer 52 Body 54 Leg 58 Feather 64 Strainer

Claims (2)

[Claims] 1. A diaphragm valve having a disk shape and having a small hole penetrating in the thickness direction of the disk, wherein a strainer is detachably attached to the small hole. 2. The strainer according to claim 1, wherein the strainer is a leg portion that is inserted into the small hole, a body portion that is disposed outside the small hole, and that is integral with the leg portion, and the strainer is attached to the body portion. A diaphragm valve equipped with a narrow waterway provided.