JPH0624275U - Check valve with water hammer buffer mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a check valve with a water hammer buffer mechanism, which can prevent damage and failure due to water hammer when the water supply pipe is closed. [Structure] A check valve body inserted in a cartridge body of a check valve unit is pressed against a valve seat via a spring,
In a check valve in which this check valve unit is mounted in a cylindrical housing, locking projections are circumferentially opposed to the inner wall of the housing, and flanges at both ends are locked to the locking projections. Then, a cylindrical cushioning material made of an elastic material such as rubber is attached, and the cartridge body is positioned inside the cushioning material.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a check valve with a water hammer buffer mechanism.

[0002]

[Prior art]

 Recently, a lever handle type faucet has become popular, and it is convenient because the faucet can be opened and closed simply by moving the lever handle up and down. However, this lever-handle type faucet has a drawback that a water hammer called a water hammer is likely to occur because it is closed instantly. That is, when the water tap is suddenly closed, the water pressure inside the water supply pipe rises sharply, hitting the pipe wall, etc., and making a sound of a dawn.

[0003]

[Problems to be solved by the device]

 In general, a check valve for preventing backflow is connected to the water supply pipe near the water tap, and this check valve has a check valve body inserted in the cartridge body of the check valve unit through a spring. The check valve unit is pressed into contact with the valve seat, and this check valve unit is installed in a cylindrical housing, and water pipes are connected to the connection ports installed on both sides of the cylindrical housing. If this occurs, the internal pressure between the water tap and the check valve will rise rapidly, and due to the high water pressure, the check valve may be impacted and damaged or malfunctioned.

The present invention has been made to solve such conventional problems, and it is an object of the present invention to provide a check valve with a water hammer buffer mechanism, which is capable of preventing damage or failure due to a water hammer. It was done.

[0005]

[Means for Solving the Problems]

 As a means for technically solving this problem, according to the present invention, a check valve body inserted in a cartridge body of a check valve unit is pressed against a valve seat via a spring, and the check valve unit is In a check valve mounted in a tubular housing, locking projections are circumferentially opposed to the inner wall of the housing, and the flanges at both ends are locked to the locking projections so that rubber, etc. The gist of the present invention is to attach a cylindrical cushioning member made of the elastic body, and to dispose the cartridge main body inside the cushioning member.

[0006]

[Work]

 When a water hammer is applied to the check valve when the water tap is closed, the high water pressure causes the intermediate portion of the cushioning material to bulge outward, and the water hammer can be absorbed or mitigated.

[0007]

【Example】

 Hereinafter, the present invention will be described in detail with reference to illustrated embodiments. In FIG. 1, reference numeral 1 denotes a cylindrical housing, in which a locking projection 1a is circumferentially opposed to a key portion of an inner wall of the housing, and a male screw portion 1b is formed at both ends of the outer wall. .

Reference numeral 2 is a cylindrical cushioning material made of an elastic material such as rubber, and flange portions 2a are formed at both ends, and by engaging the flange portions 2a with the locking projections 1a of the housing 1, respectively. Install in the housing 1.

A check valve unit U is mounted inside the cushioning member 2. The check valve unit U has a check valve body 4 in a cartridge body 3 via a spring 5 as shown in FIG. The check valve body 4 is urged by a spring 5 to be pressed against a valve seat 6 attached to the upper end of the cartridge body 3, and a seal member 7 is fitted to the outer peripheral portion of the head. Further, a gasket 8 is fitted on the flange portion 6a of the valve seat 6.

The check valve unit U pushes the cartridge body 3 into the cushioning member 2 and attaches the inflow side connection port 9 and the outflow side connection port 10 to the end of the housing 1 respectively. Can be fixed in the housing 1. That is, when the inflow side connection port 9 is attached to the end portion of the housing 1 via the tightening nut 11, the peripheral surface of the inner hole 9a presses the gasket 8 against the flange portion 2a of the cushioning material 2 and By pressing 2a against the locking projection 1a of the housing 1, the gasket 8 and the flange portion 2a can be fixed at the same time. When it is attached via the nut 12, the peripheral surface of the inner hole 10a can press and fix the other flange portion 2a of the cushioning material 2 to the other locking projection 1a of the housing 1.

The check valve with a water hammer buffer mechanism according to the present invention is configured as described above, and the inlet side inlet 9 and the outlet side outlet 10 have a primary side water supply pipe 13 and a secondary side water supply pipe 13 '. Are connected to each other, and a lever handle type water supply plug (not shown) is attached to the tip of the secondary side water supply pipe 13 'for use.

When the water tap is opened, the check valve body 4 is pushed by the water flowing into the inflow side connection port 9 as shown in FIG. 4 and moves to the right in the figure against the spring 5. A gap is created between the valve seat 6 and the valve seat 6. Therefore, the water supplied from the primary side water supply pipe 13 into the inflow side connection port 9 flows through the inner hole 9a, the valve seat 6 and the inside of the cartridge main body 3, and the gap 3b between the ribs 3a as shown in FIG. Through the inner hole 10a, through the outflow-side connection port 10 and into the water supply pipe 13 ', and then supplied to the outside from the water tap at the end.

When the water tap is closed, the water pressure on the side of the secondary side water supply pipe 13 'becomes high, so the check valve body 4 is pushed back to the left in FIG. 2 and the valve seat 6 is closed to prevent backflow. At this time, a part of the water comes out from the gap 3b of the cartridge body 3 and presses the cushioning material 2, and the middle portion thereof bulges outward as shown by the phantom line in FIG. Therefore, the water pressure can be absorbed or relieved by the swelling of the cushioning material 2, that is, the water hammer when the water tap is closed rapidly can be suppressed.

Since the bulging portion of the cushioning material 2 is received by the inner wall surface of the housing 1, the cushioning material 2 does not swell and rupture too much, and the cushioning material 2 is formed of an elastic material such as rubber. Therefore, if the water pressure is released, it will be easily restored.

FIG. 5 shows the experimental results of measuring the internal pressure of the water supply pipe 13 ′ when the water supply plug was closed. According to this, the maximum pressure value of 6.277 (kg / cm) was obtained about 0.7 seconds after the water supply plug was closed. ² ), but in the case of the conventional example shown in FIG. 6, the maximum pressure value was 12.41 (kg / cm ² ), and it was found that the pressure could be reduced to about half that of the conventional case. Further, since the structure is simple, it can be provided at a low price, and it can be incorporated into an existing check valve to be applied, which is very convenient.

[0016]

[Effect of device]

 As described above, according to the present invention, in the check valve connected to the water supply pipe, the cushioning material made of rubber or the like is provided in the housing, so that the cushioning material swells due to the increase in the sealing water pressure generated when the valve is closed. It can be absorbed or mitigated by, and has the effect of preventing damage and failure of the check valve due to water hammer.

[Brief description of drawings]

FIG. 1 is a sectional view of a check valve according to an embodiment of the present invention.

FIG. 2 is a sectional view of a check valve unit.

FIG. 3 is a partially omitted side view of the same as seen from the cartridge body side.

FIG. 4 is a sectional view for explaining the operation of the check valve unit.

FIG. 5 is a graph showing the results of a measurement experiment of the pressure inside the pipe when the plug is closed.

FIG. 6 is a graph showing a measurement experiment result of a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Housing 1a ... Locking projection 1b ... Male screw part 2 ... Buffer material 2a ... Flange part 3 ... Cartridge body 4 ... Check valve body 5 ... Spring 6 ... Valve seat 6a ... Flange part 7 ... Sealing material 8 ... Gasket 9 ... Inflow side connection port 9a ... Inner hole 10 ... Outflow side connection port 10a ... Inner hole 11, 12 ... Tightening nut 13 ... Primary side water supply pipe,
13 '... Secondary side water supply pipe U ... Check valve unit

Claims (1)

[Scope of utility model registration request] 1. A check valve in which a check valve body inserted in a cartridge body of a check valve unit is pressed against a valve seat via a spring, and the check valve unit is mounted in a cylindrical housing. A pair of locking projections are circumferentially provided on the inner wall of the housing, and flange portions at both ends are locked to the locking projections to attach a tubular cushioning member made of an elastic body such as rubber. A check valve with a water hammer buffer mechanism, characterized in that the cartridge body is provided inside a buffer material.