JPS5838065Y2 - Structure of antifreeze faucet - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of an anti-freeze faucet, and particularly relates to an anti-freeze faucet that takes into consideration durability and stability.

Currently, in cold regions, tap water freezes during the winter, so antifreeze faucets are used to prevent this from freezing.

The structure of the valve part of the antifreeze faucet, which is located underground in a place where the temperature is constantly maintained above 0°C, allows water in water pipes in a freezing atmosphere to be discharged into the ground, which is subject to freezing. This removes water from the pipes.

Conventionally used anti-freeze faucets use a backing made of elastic material such as rubber as a means of sealing water, and accidents involving wear and tear of this backing are the most common accidents involving anti-freeze faucets. It is expected that the stability of antifreeze faucets will further increase by improving this problem.

At the same time, in recent years, due to the diversification of materials used for water pipes and the widespread use of hot water, brass materials, which were conventionally used as the component material for the valve part of anti-freeze faucets, have become increasingly used for dissolved oxygen, hot water, etc.
Due to the effects of chlorine ions, etc., an environment is created that is highly susceptible to corrosion, resulting in a significant decrease in durability.

Furthermore, on the other hand, the structure of the antifreeze faucet itself is designed to facilitate quick operation, especially from the viewpoint of ease of use, and as a result, durability is often affected by the instantaneous rise in pressure caused by water hammer and vibrations. There are also aspects that are causing a decline.

Therefore, the present invention relates to an improvement of an anti-freeze faucet aimed at eliminating the above-mentioned drawbacks, and has the following structure for this purpose.

That is, a water inlet is provided at an appropriate position below these openings in a valve body that has a drain port and an outlet opening on the side of the cylinder, and the water supply and stop is controlled by the position of the piston that reciprocates in the cylinder. In an anti-freeze faucet that selects the state of water drainage, in order to seal water, it comes in close contact with the cylinder between the inlet and outlet when closed, and in close contact with the cylinder between the outlet and drain when opened. A part of the piston has a sealed peripheral surface with a plurality of annular grooves with a diameter slightly larger than the inner diameter of the cylinder, and the piston is made of a relatively easily deformable material such as synthetic resin. A pressure absorbing piston is attached to a part of the cavity on the inlet side and is pressed by a spring so as to be slidable without sealing off water.

The details will be explained below according to the drawings. FIG. 1 shows an embodiment of the present invention in an open state. Water outlet ports 2 and drain ports 3 are opened on the sides of cylinders A, B, and C of the valve body 1, and Partly in this case sideways inlet 4
It is open.

A pipe (not shown) is connected from the outlet 2 and is led to a drain (not shown) that is installed when above-ground water is required.

The valve body 1 is located underground, and is connected to a water supply pipe (
(not shown) is connected to the inlet 4, and water is supplied from the inlet 4 through the outlet 2 from the drain.

A piston 5 having a sealing circumferential surface F and a sealing surface F which come into close contact with the cylinders A, B and C of the valve body 1 is connected to the shaft 9 by a pin 11.

The valve body 1 is fixed to the vibrator 10 with screws, and is extended together with the shaft 9 and connected to an upper operating mechanism (not shown).

The drain port 3 is formed by forming a plurality of annular grooves on the sealed peripheral surface F of the piston 5, and forming an axial portion E that allows water to flow between them with a diameter smaller than the inner diameter of the cylinder B.
Allow drainage from.

In this case, a cylinder G is formed at the bottom of the valve body 1 on the side where the inlet port 4 is provided, and a pressure absorbing piston 6 that slides therein is moved by a spring 7.
Press the stopper L to prevent it from coming off.

The spring 7 is housed in the spring chamber M of the valve body 1 by the cap 8, and a notch K is provided in a part of the thread where the cap 8 connects to the valve body 1. The pressure is constantly equalized to atmospheric pressure.

Furthermore, in the empty chamber J of the valve body 1, the valve seat surface ■ of the auxiliary water stop body 12 to be housed therein is provided at the lower stage of the cylinder A, and the other valve seat surface H is provided to prevent backflow to the water supply pipe side. Entrance 4
It is provided on the side.

In the open state shown in Fig. 1, the sealing circumferential surface of the piston 5 is in close contact with the cylinder B to seal off water, so the drain port 3
Since no pressure water flows through the pipe 10 and the sealing peripheral surface F is pushed upward from the cylinder C, the water remaining in the pipe 10 flows out from the drain port 3.

A handle (not shown) that connects to the shaft 9 from this state
When the piston 5 is moved downward by turning, the tip of the piston, which has a diameter sufficiently smaller than the inner diameter of the cylinder A, pushes the auxiliary water stop body 12 downward, and the sealing circumferential surface closes the inlet 4 and the outlet. The water enters cylinder A between piston 5, where it is temporarily stopped, and then piston 5.
If the auxiliary water stop body 12 comes into close contact with the valve seat H when the valve moves downward, the water filling the empty space J will be compressed.

At this time, the pressure absorbing pin 6 pressed by the spring 7 receives the force and moves downward, creating a volume in the empty space J equal to the amount of water compressed by the piston 5. is not compressed and has no effect on operation, allowing you to operate the handle normally, and the second
It will be in the closed state shown in the figure.

In that case, when the piston 5 is moved in a short period of time, the moment the sealing surface enters the cylinder A, there is a sudden increase in pressure accompanied by water hammer, and an unpleasant sound is generated due to vibration, but the pressure absorbing piston 6 is supported. The spring 7 that is in place receives the force and absorbs the vibration energy, thereby preventing accidents caused by water hammer.

In the closed state shown in FIG. 2, the piston 5 is in a position where its sealing circumferential surface is pushed downward from the cylinder B between the outlet 2 and the drain port 3, and the sealing circumferential surface F is in close contact with the cylinder C above the drain port 3. Therefore, the outflow port 2 and the drain port 3 are communicated through the shaft-like portion E, resulting in a state of water-stop drainage.

Furthermore, when the piston 5 is replaced, simply by moving the piston 5 upward, the auxiliary water stop body 12 comes into contact with the valve seat (2) and stops water, making it possible to pull out the piston 5 as it is.

FIG. 3 shows an example of the sealing circumferential surface and F of the piston 5. As shown in FIG. An escape area is formed for the outer diameter part that is crushed by the force received at the contact surface with the cylinder, which can provide a sealing effect, but at the same time, the large number of grooves also produces an effect as a labyrinth backing.

An example of the groove shape is shown in FIG. 19, but if the groove is formed in an annular shape, the number of grooves becomes a problem regardless of the shape, but it is desirable to increase the number of grooves as the material becomes harder.

The piston 5 may be made of synthetic resin, and if there is a problem with its strength, the piston may be reinforced from the inside with a metal material.

As mentioned above, by using a material such as synthetic resin for the piston that allows for some deformation, water can be sealed without using a backing, thus eliminating accidents caused by backing, and at the same time, it is possible to seal water without using a backing. A highly effective antifreeze faucet can be obtained with an extremely simple structure in which the pressure absorbing piston can absorb the energy generated by water hammer.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an embodiment of the structure of the main valve part of the present invention in an open state, Fig. 2 is a longitudinal cross-section of a closed state, and Fig. 3 is a partial view of an embodiment of the piston. be. 1... Valve body, 2... Outlet, 3...
...Drain port, 4...Inflow port, 5...
・Piston, 6...Pressure absorption piston, 7...
...Spring, A, B, C...Cylinder, D
, F... Sealed peripheral surface.

Claims (1)

[Scope of utility model registration request] The valve body has a drain port and an outflow port that open on the side of the cylinder, and a water inlet is provided at an appropriate position below these openings, and water is supplied or stopped depending on the position of the piston that reciprocates in the cylinder. Anti-freeze faucets that select the drainage state have multiple annular grooves that seal the water by coming into close contact with the cylinder between the inlet and outlet when the valve is closed, and by coming into close contact with the cylinder between the outlet and the drain when the valve is open. A sealing surface having a diameter slightly larger than the inner diameter of the cylinder is formed as a part of the piston, and the screws 1 to 1 are made of a relatively easily deformable material such as synthetic resin, and the sealing surface is formed on the inlet side of the valve body. A structure of an antifreeze faucet, characterized in that a pressure absorbing piston is slidably installed in a part of the empty space in the chamber and is pressed by a spring.