JPH0124466Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a water drain valve in piping in cold regions, and more particularly to a water drain valve that effectively prevents water hammer.

Traditionally, water drain valves in cold regions have been either anti-freeze faucets whose valve part is buried underground and extended using pipes or rods to be operated above ground, or those which are not buried underground and are installed indoors. , Drain valves for plumbing are often used to discharge water from a drain outlet to another place via a drain pipe. These devices first cut off the water on the inlet side and then open the drain port and drain the water in the outflow side piping by operating the handle once, but recently, the ease of operation has been improved. In order to measure water flow, instead of conventional screws that require turning the handle many times, many systems have been used that have a cam-type operating mechanism that allows water flow and drainage conditions to be selected by rotating the handle within 180 degrees. There is. However, although these devices have certainly become easier to operate, they stop the water so suddenly that large water hammers occur, causing unpleasant vibration noises and accidents that can lead to damage to piping joints. ing.

In view of the above, the purpose of the present invention is to provide a drain valve for cold regions that can effectively prevent water hammer despite the small rotation of the handle.The basic structure for this purpose is to An outflow port is provided above, an outflow port is provided below, and a drain port is provided at the bottom end. Inside, a small diameter cylinder with the same diameter is provided above the inflow port, outflow port, and drain port, and a large diameter cylinder is provided at the top end. A piston equipped with a ring-shaped gasket that slides on each cylinder moves up to pass water through the valve body, and moves down to select the drain state, and in the water flow state, the piston is attached to the large-diameter cylinder. A communication passage having a small diameter flow passage in a part is provided in the piston or on the side wall of the valve body to communicate the upper end of the damper chamber and the outlet, and the piston changes from the water flow state to the drainage state by operating the handle. In some cases,
By gradually moving the water in the damper chamber to the outlet through the communication path, the descending speed of the piston is slowed down, thereby preventing water hammer.

The present invention will be described below with reference to embodiments shown in the drawings.

In the embodiment shown in FIG. 1, the valve body 1 has an inlet 2 above the side wall, an outlet 3 below the inlet 2, and a drain 4 with an open lower end. Inside, there are cylinders 5, 6, and 7 above the inlet 2, outlet 3, and drain 4, respectively, and above the cylinder 5,
A cylinder 8 having a larger diameter than the above cylinder is formed.
Inside the valve body 1, the small diameter cylinder 5,
6, 7 and a large-diameter cylinder 8, respectively. A small-diameter flow path 15, a vertical hole 16, and a horizontal hole 1 are formed in the piston 13 to form a damper chamber 14 that communicates with the upper end of the damper chamber 14 and the outlet 3 when water is flowing.
A communication path 18 consisting of 7 is provided. Furthermore, the piston 13 is connected to the opposing cam 20 via the upper narrow diameter portion 19 by a roll pin 21.
The handle 22, which is integrally formed with the handle 22, is vertically rotated to move up and down. cam 2
0 is the operating part main body 2 connected to the upper end of the valve main body 1
3, and a cam 20 above it.
Vertical movement is restricted by an upper sliding surface 26 provided on the protruding portion 25 that faces each other with the two interposed therebetween.

Next, the operating mode of the present invention will be explained.

Figure 1 shows the state of water flow, where water from the inlet 2 passes through the outlet 3, flows into the outlet side pipe connected to the outlet 3 (not shown), and is discharged from the faucet at the end of the pipe. . At the same time, since the ring-shaped gasket 9 of the piston 13 is detached from the cylinder 5, the pressure water from the inlet 2 enters the damper chamber 14 and flows through the communication path 18 consisting of the small diameter flow path 15, the vertical hole 16, and the horizontal hole 17. It flows out to the outlet 3 side, which is also the low pressure side. In this state, the ring-shaped packing 12 is attached to the cylinder 8,
A ring-shaped packing 11 is in close contact with the cylinder 7 to prevent water from leaking to other parts.

Next, when changing from the water flow state to the drain state as shown in the diagram,
When the handle 22 is rotated vertically to the left in the figure, the cam 20 whose vertical movement is restricted by the upper and lower sliding surfaces 26 and 25 also rotates while moving its center in the left-right direction, and the roll pin 21 is attached to the cam 20. The piston 13, which is connected at , begins to descend. At this time, the piston 13 descends smoothly until the ring-shaped packing 9 comes into close contact with the cylinder 5, but at the same time, the piston 13 moves down due to the diameter difference between the cylinders 8 and 5.
compresses the water in the damper chamber 14 and attempts to descend. Of course, since water is incompressible, it will stop descending if left as it is, but at this time, the water in the damper chamber 14 will be slightly reduced through the communication passage 18, which has a small diameter passage 15 in a part. The water gradually flows out toward the outlet 3 side, and the piston 13 continues to descend by that amount. That is, the smaller the passage cross-sectional area of the narrow-diameter flow path 15 is, the more slowly the piston 13 will descend even if the handle 22 is rotated quickly, and water hammer will not occur. When the piston descends, the ring-shaped gasket 9 first comes into close contact with the cylinder 5, and as it continues to descend, the ring-like gasket 10 comes into close contact with the cylinder 6, blocking water from the inlet 2, and rotates 180 degrees to open the handle 22.
When the ring stops rotating, the ring-shaped gasket 11 has completely separated from the cylinder 7, and all the water in the outflow side pipe is drained from the drain port 4 to a drain pipe (not shown) connected to the drain port 4. It is discharged to other places through. Since the drain port 4 is provided with a large opening at the bottom end of the valve body 1, the water inside the piping can be drained quickly and completely. , drainage may be done from the side. Piston 13
Since the roll pin 21, roll pin 21, and cam 20 are located on the same axis, the upward force or downward force acting on the piston 13 does not act as a rotational force on the cam 20. Therefore, the piston 13 is rotated by itself due to water pressure or its own weight. Although so-called self-propulsion, which is a movement upward or downward, does not occur, when water is flowing, upward water pressure generated by the difference in diameter between cylinders 8 and 7 acts on the piston 13, and the piston 13 descends due to its own weight. In addition, in the draining state, since the cylinders 5 and 6 have the same diameter, no upward force due to water pressure acts on the piston 13, which makes the self-propelling prevention effect even more complete. There is. If an air pocket is generated in the damper chamber 14 when the piston is lowered, since air is compressible, the piston lowering speed becomes faster and water hammer is more likely to occur. The ring-shaped gaskets 9 and 10 have been separated from the cylinder, and the small diameter flow path 15 is connected to the piston 13.
Since it is placed as high as possible above the water, when water is flowing,
It can be expected that the water that has entered the damper chamber 14 from the inlet 2 causes the air to flow out to the outlet 3. Therefore, even if there is almost no loss resistance on the downstream side of the outlet 3. Damper chamber 1
4 is almost completely filled with water.

FIG. 2 shows another embodiment of the present invention, which is also a longitudinal cross-sectional view of the main part in a water-flowing state, in which a needle valve 28 is provided in the vertical hole 16 of the piston 13 and has a tapered portion 27 from the lower end to the tip. is screwed in, and a small diameter channel 15 is formed between the vertical hole 16 and the tapered part 27.
was formed. Therefore, by pulling out the piston 13 and moving the needle valve 28 up and down with a screwdriver or the like, the cross-sectional area of the small-diameter flow path 15 can be changed, and the downward speed of the piston 13 can be adjusted.

The present invention has been explained above based on the embodiment shown in the drawings, but the present invention is not used as a drain valve for piping as in the embodiment, but instead prevents the backflow of sewage from underground to the drain port 4. It can also be used as an anti-freeze faucet by attaching a check valve and connecting the valve body 1 to the operating mechanism by extending the valve body 1 to the ground by a pipe and the piston 13 by a rod.In addition to the cam as the operating mechanism, Of course, the present invention can also be applied to devices in which the rotation of the handle is reduced by using a helicoid or a screw with a large lead, for example.

As explained above, the present invention adopts a valve type in which the inlet is provided above the outlet and the piston moves downward to shut off water, and the damper chamber surrounded by the large-diameter cylinder at the top end is closed. By providing a communication path in the piston that has a small diameter flow path in part from the upper end to the outlet, the descending speed of the piston 13 can be slowed down with a simple structure, and air pockets in the damper chamber can also be eliminated. This has the effect of reliably preventing the occurrence of water hammer.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of one embodiment of the present invention in a water-flowing state, and FIG. 2 is a longitudinal cross-sectional view of a main part of another embodiment of the present invention, also in a water-flowing state. 1...Valve body, 2...Inflow port, 3...Outflow port,
4... Drain port, 5, 6, 7, 8... Cylinder,
9, 10, 11, 12...Ring-shaped packing, 1
3... Piston, 14... Damper chamber, 15...
Small diameter channel, 18... Communication path, 20... Cam, 22
... Handle, 23 ... Operation unit main body, 28 ... Needle valve.

Claims (1)

[Scope of utility model registration request] There is an inlet at the top of the side wall, an outlet at the bottom, and a drain at the bottom end. Inside, there are small cylinders with the same diameter above the inlet, outlet, and drain, and a cylinder with a large diameter at the top. A valve body consisting of a cylinder,
A ring-shaped gasket that slides on each of the above-mentioned cylinders is installed, and a piston that moves up in the valve body to select the water flow state or down to select the drainage state by operating the handle, and the piston that slides on the above-mentioned large diameter cylinders. A damper chamber surrounded by a large-diameter cylinder is formed below the ring-shaped gasket, and a communication path having a small-diameter flow path in part is formed in the piston, from the upper end of the damper chamber to the outlet when water is flowing. Water hammer prevention water drain valve.