JPH0425576Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a water valve device that opens and closes a water passage to control hot water output from, for example, an instantaneous water heater.

(Prior art) In a water valve device in which a main valve is simply provided in a valve housing, when the main valve is moved from the closed state to the open direction, it is necessary to resist the water pressure acting on the back side of the main valve. Since the main valve must be pushed with a large amount of force, a large amount of force is required. Therefore, a sub-valve hole that is opened and closed by a sub-valve is provided in the main valve, and the sub-valve hole is first opened with a small force to reduce the water pressure acting on the back side of the main valve through the sub-valve hole. There are known devices configured to do this. In addition, the water valve device equipped with this sub-valve hole is
When the sub-valve hole is closed, the water pressure in the pressure chamber increases, and the main valve is pushed by the water pressure and moves in the closing direction together with the sub-valve.

(Problem to be solved by the invention) In the water valve device equipped with the above sub-valve hole, when the main valve moves from the open position to the closing direction, the water pressure in the pressure chamber increases as the main valve moves. The speed at which the valve moves in the closing direction increases as it approaches the main valve hole, and the main valve hole is abruptly closed, and there is a possibility that a water hammer phenomenon may occur due to the impact caused by the closing of the main valve hole. By the way, although a device that uses a dart pot to alleviate the impact caused by closing the main valve is described in Japanese Utility Model Publication No. 53-2329, the device described in that publication has the disadvantage that the entire device becomes larger. Accompany.

(Means for Solving the Problems) The purpose of the present invention is to obtain a device that does not have such inconveniences, and includes a main valve that opens and closes the main valve hole, and a main valve that opens and closes the main valve hole. A sub-valve that opens and closes a sub-valve hole formed therein, and the main valve closes together with the sub-valve due to the water pressure in the pressure chamber on the back side of the main valve, which rises when the sub-valve hole is closed. A valve rod that extends from the sub-valve and slides through the valve housing, and a valve rod that extends from the sub-valve in the sliding direction of the valve rod. On the other hand, a spiral cam surface is provided, and on the other hand, a cam pin or other engaging member is provided that engages with the cam surface and regulates the moving speed of the sub valve in the closing direction of the main valve.

(Effect) When the main valve tries to move in the closing direction ahead of the sub-valve, the sub-valve hole opens, the water pressure acting on the back side of the main valve decreases, and the movement speed is reduced.
The main valve cannot move in the closing direction ahead of the sub-valve, and eventually the main valve moves together with the sub-valve. According to the present invention, the speed at which the auxiliary valve moves in the direction of closing the main string together with the main valve is regulated to a predetermined speed by the action of the cam surface and the cam pin that engages with the cam surface. The speed at which the valve moves in the closing direction is regulated to a predetermined speed together with the sub-valve.

(Example) Referring to the figure, 1 indicates a valve housing of a water valve device, and a main valve 3 for opening and closing a main valve hole 2 is provided in the valve housing 1.
A sub-valve 5 that opens and closes the sub-valve hole 4 formed in the main valve 3
A push rod 6, which is a valve lever, is slidably extended from the sub-valve 5 through the valve housing 1, and when the push rod 6 moves forward, it resists the spring 7. The sub-valve 5 was moved to the right in the figure, and the sub-valve hole 4 was opened. When the sub-valve hole 4 opens, the water pressure in the pressure chamber 8 provided on the back side of the main valve 3 is opened downstream through the sub-valve hole 4 and decreases.
Accordingly, the main valve 3 is pushed by the spring 9 and moved in the opening direction. Then, when the force pushing the push rod 6 to the right is released and it is moved back to the left, the sub-valve 5 is pushed by the spring 7 and moves to the left, closing the sub-valve hole 4. The water pressure in the chamber 8 gradually rose, and the main valve 3 was pushed by the water pressure to close.

Further, a regulating means 10 is provided which includes a spiral cam groove 11 in the reciprocating direction of the push rod 6 and a cam pin 12 as an engager that engages with the cam groove 11. Note that in this embodiment, the cam groove 11 is connected to the valve housing 1.
The pin 12 was provided on the push rod 6 side.

According to the above configuration, in order to close the main valve hole 2,
When the force pushing the push rod 6 to the right is released, the auxiliary valve 5 moves to the left through the push rod 6 while being regulated to a predetermined speed, thereby closing the auxiliary valve hole 4. When the sub-valve hole 4 is closed, the main valve 3 is pushed by water pressure and begins to move in the closing direction, that is, to the left, but the main valve 3 tries to move to the left ahead of the sub-valve 5. Then, the sub-valve hole 4 opens and the water pressure in the pressure chamber decreases, so that the speed of movement of the main valve 3 in the closing direction is reduced. Then, the auxiliary valve 5 catches up with the main valve 3, so that the main valve 3 and the auxiliary valve 5 eventually move in the closing direction. Therefore, if the moving speed of the sub-valve 5 is regulated to a predetermined speed, the moving speed of the main valve 3 in the closing direction is also regulated to a predetermined speed, so that even if the main valve hole 2 is closed, No water hammer phenomenon occurs.

(Effect of the invention) As described above, according to the invention, by regulating the movement speed of the sub-valve to a predetermined speed, the movement speed of the main valve, which moves in the closing direction together with the sub-valve, also reaches the predetermined speed. This prevents the water hammer phenomenon from occurring even if the main valve hole is closed. Furthermore, since there is no need to provide an accumulator or the like to prevent the water hammer phenomenon from occurring, the overall size of the device is not increased compared to conventional devices.

[Brief explanation of the drawing]

FIG. 1 is a cutaway side view of one embodiment of the present device. 1...Valve housing, 2...Main valve hole, 3...Main valve, 4...
... Sub-valve hole, 5... Sub-valve, 8... Pressure chamber, 11...
(Spiral) cam groove, 12...cam pin (engaging element).

Claims (1)

[Scope of utility model registration request] The inside of the valve housing is equipped with a main valve that opens and closes a main valve hole, and a sub-valve that opens and closes a sub-valve hole formed in the main valve. The main valve is moved together with the sub-valve in the closing direction by water pressure in the pressure chamber, and a valve rod that penetrates the valve housing and slides is provided extending from the sub-valve, One of the housing and the valve rod is provided with a spiral cam surface in the sliding direction of the valve rod, and the other is engaged with the cam surface to control the movement speed of the sub-valve with respect to the closing direction of the main valve. A water valve device equipped with a cam pin or other engaging element that regulates water flow.