JPS6035665Y2 - Water hammer prevention device in flash valve - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for preventing the water hammer phenomenon that occurs when the valve port rapidly closes in a flush valve that opens and closes the valve in one action.

Conventionally, there is a method for preventing noise generated when using a flush valve, as shown in FIG. 1 of Japanese Utility Model Publication No. 54-22580 (FIG. 3 of the drawings of the present application).

Briefly explaining FIG. 3, when the handle 30 is operated and the valve stem 32 is actuated by the inner end of the handle shaft 31,
Following the start valve 33, the valve unit 34 opens, and the water supply pipe 3
The water in 5 pushes up the valve body 36, opens the valve port 37, enters the globe valve 38, reaches the flush valve A' from the connecting pipe 39, passes through the open valve port 41, and closes the flush valve A'. The water is discharged into a drain pipe 40 connected to the lower part of the pipe.

In the above case, the lower part of the bulge 42 of the valve body 36 cannot escape from the valve port 37, and the water passing through the valve port 37 flows along the slope of the bulge 42. The water is ejected like a jet stream.

Therefore, with such a valve structure, it could not be expected at all to prevent the impact caused by the strong water hammer that occurs when the valve port 37 is opened.

The present invention aims to solve the above problems and significantly reduce the impact of water hammer when opening and closing a valve.

The basic structure of this device is that a check valve part attached to a flush valve part having a flow rate control mechanism is provided with a valve seat part having a long valve opening, and a valve seat part is provided on the outer peripheral surface of the valve seat part. A check valve body corresponding to the valve seat is supported on the adjusting screw via the valve stem, and this check valve body is designed to wrap around the backing. A part of the cover having a lumen is shaped, and the eye end of the part of the cover corresponds narrowly to the working conical surface, so that the flow velocity of the fluid ejected from the valve opening is reduced by changing the gap. The flow rate control mechanism is configured such that its flow rate control operation is linked with the flow rate control operation of the flush valve.

Hereinafter, embodiments of this invention will be described in detail based on the drawings.

In an embodiment of this invention, as shown in FIG. 1, a check valve part 7 is connected to a flush valve part A via a flexible connecting pipe B.
A check valve body 1 corresponding to a valve seat portion 8, which will be described later, is installed inside the check valve chamber.

This check valve body 1 is provided with a cover portion 3 at one end of a valve stem 2,
A backing 5 of rubber or synthetic resin is fixed to the inner cavity 4 of the cover part 3 by a nut 6, and the inner cavity 4 has an eye end 4' having a larger diameter than the backing 5.

The valve seat portion 8 includes a long valve port 9 that communicates between a primary pressure water supply pipe C leading to a water supply source and a check valve chamber leading to a connecting pipe B, and a valve seat 10 formed at the tip thereof. The outer peripheral surface of the valve seat portion 8 has a mouth end 4 corresponding to the inner diameter of the eye end 4' of the inner cavity 4.
A check valve body having a working conical surface 11 formed at a required inclination angle for controlling the flow rate to increase and decrease the flow rate while changing the gap in accordance with the displacement of 1 constitutes a flow rate control mechanism 12.

The valve stem 2 of the check valve body 1 is held in the insertion hole 15 of an adjustment screw screwed into the stopper 13 of the check valve portion 7.

The water supply pipe C is connected to a connecting part 16 on the water introduction side of the check valve section 7, one end of the connecting pipe B is connected to the connecting part 17 on one side, and the other end of the connecting pipe B is connected to the connecting part 17 on one side. The flexible connecting pipe 18 of the flush valve section A is flexibly connected.

The flow rate control mechanism 12' of the flush valve section A includes a valve chamber 1
The guide 2 is inserted through the screw hole 21 into the starting valve 20 installed in the guide 9.
2 are combined, and this guide 22 has a thickened 7 lange 23.
In this situation, a plurality of fluid water passage holes 24 are provided at approximately equal intervals, and this guide 22 is interposed in the valve port 25 to temporarily control the water flow rate at the initial stage of opening and closing of the valve port 25 by the starting valve 20. The structure is configured to increase the water hammer to prevent the occurrence of water hammer.

In this invention, when the handle 26 is operated and the inner end of the handle shaft 27 operates the valve stem 28 in the normal manner, the valve port 25 is opened by the starter valve 20.

Induced by this action, the pressurized fluid water in the water supply pipe C connected to the check valve section 7 starts, pushes up the check valve body 1, opens the valve port 9, and enters the check valve chamber. Then, the flow reaches the flush valve part A which communicates with this check valve chamber via the connecting pipe B, passes through the open valve port 25, and flows into the drain pipe E connected to the lower part of the flush valve part A. It is released as follows.

In this case, the upper part of the check valve body 1 is pressed against the lower end of the adjusting screw 14, but at the initial stage of opening the valve, the backing 5 begins to gradually separate from the valve seat 10 as shown in FIG. Since the port 9 is slightly opened, the water in the water supply pipe C starts gushing out from the gap between the valve seat 10 and the backing 5 into the inner cavity 4 of the cover part 3 while the flow rate is restricted by the long valve port 9. .

In this case, the eye end 4' of the cover part 3 is the working cone surface 1 of the valve seat part 8.
Since a slight gap is beginning to be created between the inner cavity 4 and the inner cavity 4, the water ejected into the inner cavity 4 gradually flows out from the previous one along the working conical surface 11 into the check valve chamber. , check valve body 1
When the fluid ejected from the gap between the valve seat 10 and the valve seat 10 flows along the working conical surface 11 through the narrow gap narrowed by the eye end 4' of the cover part 3 and the working conical surface 11, the fluid ejects from the cover part 3. The fluid is momentarily confined in the inner cavity 4 of the valve 3, and back pressure is applied to the fluid ejected from the longer valve port 9 to reduce the pressure of the fluid, and the flow velocity of the fluid is significantly reduced. Reliably prevent the phenomenon from occurring.

In parallel with this operation, water passing through the valve port 25 of the flush valve section A temporarily increases in a small amount through the water passage port 24 of the flange 23 at the beginning of opening of the valve port 25, as shown in the port in Figure 2. Therefore, the valve port 25 can be opened without giving room for water hammer to occur.

Flow rate control mechanism 1 for this flush valve section A and check valve section 7
By simultaneously operating 2.12', it is possible to reliably prevent the strong impact that occurs when water is discharged, which is unique to flush valves.

In addition, even when the flush valve section A stops discharging water, the check valve body 1 operates in the reverse order as described above, so when the check valve body 1 closes the valve port 9, the flow rate increases significantly. control.

Since the present invention is configured as described above, it has the following advantages.

(1) The area around the check valve body is covered by a part of the cover built into the valve stem or the check valve body, and part of the cover is provided at the eye end of the inner cavity and in a long way so as to enter the inner cavity. Since the outflow amount of the fluid is controlled by the working conical surface of the valve seat section, the outflow amount is violently ejected at the initial stage of opening of the check valve section, thereby preventing a strong impact caused by water hammer at the time of discharge.

(2) By forming the action pyramidal surface at the required angle of inclination,
In the early stages of opening the valve, when noise generation is noticeable, the gap between the working conical surface and the end of a part of the cover is kept narrow, and as the opening amount of the valve opening increases, the working conical surface and the cover are rapidly aligned. Since the structure increases the gap between the valve and the mouth end, fluid can flow out smoothly even when the valve is fully open.

(3) In addition, when passing through the valve port of the flush valve section, a small amount is temporarily allowed to flow out through the water inlet of the flange, further reducing the impact of water discharge and creating a synergistic effect with the check valve section. The water hammer phenomenon can be reliably prevented.

(4) The same action works in the check valve part and the flush valve part just before the valve is closed, and since the respective valve ports are not suddenly closed, the water hammer phenomenon can be reliably prevented when the water is stopped. can.

(5) By reliably preventing the water hammer phenomenon compared to conventional systems, the impact is greatly alleviated, and as a result, damage or malfunction of the valve body and other connected parts can be completely eliminated.

[Brief explanation of drawings]

Figure 1 is a front sectional view of a flush valve equipped with the present invention, Figure 2 A is an explanatory diagram showing the operating procedure of the flow rate control mechanism in the check valve part, and the opening is the flow rate control mechanism in the flush valve part. FIG. 3 is an explanatory diagram showing the operation procedure of the conventional technology. Explanation of symbols of main parts, 1...Check valve body, 2.
... Valve stem, 3 ... Part of the cover, 4 ...
...Inner cavity, 4'... Mouth end, 5... Backing, 7... Check valve part, 8... Valve seat part, 9... ...Valve port, 11...Action cone surface,
14...Adjustment screw, A...Flush valve part.

Claims (1)

[Scope of utility model registration request] In the check valve part 7 provided on the primary pressure side of the flush valve part A, the check valve element 1 for opening and closing the valve port 9 is supported by the adjusting screw 14 via the valve rod 2 at one end, The other end of the valve body 1 is formed with a cover part 3 having an inner cavity 4 into which a backing 5 is attached, and the valve seat part 8 is centered around a valve port 9 which is longer in the water flow direction.
A working conical surface 11 with a required inclination angle is formed in a long shape on the outer peripheral surface of the valve port 9, and the gap between the working conical surface 11 and the mouth end 4 of the cover part 3 is kept narrow to control the flow rate. A flow rate control mechanism 12 that can be freely controlled is provided, and the flow rate control operation of this flow rate control mechanism 12 is synchronized with the flow rate control operation of the flow rate control mechanism 12' of the flush valve section A. A water hammer prevention device for flush valves, which is characterized by mitigating water hammer when opening and closing.