JPH0316560B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water draining device for preventing water from freezing in pipes in various water supply and hot water supply equipment.

As is well known, check valves are installed in the middle of water supply pipes and hot water supply pipes in various water supply and hot water supply equipment, but the check valve can drain water from the primary side and the secondary side at the same time. There is a conventional drain valve disclosed in, for example, Japanese Utility Model Publication No. 56-47256.
Its structure is basically the same as that of the check valve part in the hot water mixing faucet shown in Figs. 1 to 3, so the structure will be explained according to the figure. In the main body, b is a hot water supply pipe, c is a water supply pipe, d is a discharge port, e is a hot water mixture ratio adjustment handle, f is a discharge handle, and the check valve part g provided in the hot water supply pipe b and the water supply pipe c is Figures 2 and 3 show enlarged longitudinal sections. The check valve h has a four-pronged guide fitting i on its back side.
is fixed by a screw j, and the check valve is biased by a coiled spring k to close the valve port m. n is a water drain plug screwed into the cylindrical part o, a T-shaped through hole p is formed in the center, and the rubber q fixed to the inner end surface communicates with the primary side of the check valve h. The drain plug n so that the drain hole s can be sealed
By loosening the check valve h through the drain holes r and s.
Water can be drained from the primary and secondary sides at the same time. However, with the conventional anti-freezing water drain structure constructed in this way, water can be drained from the primary side and the secondary side of the check valve at the same time by simply operating a single drain valve n, which has the advantage of requiring less effort. It is something you have. However, this structure has the following drawbacks. In other words, even if the water is drained, the check valve h, guide fitting i, valve port m, etc. are still wet with water and it is difficult to completely drain the water, so the remaining water freezes and the check valve is closed. Valve h is valve port m
If the water supply pipe c is set in an inclined shape as shown in Fig. 3 and the drain holes r and s are not located directly below, the remaining water t may get stuck. In this way, once the water has cooled down, even if the water is recirculated, the water will fill up to the front of the check valve h, but it will not flow to the secondary side at all. Also, in cold regions, the water temperature is low. The secondary side cannot be thawed and may not be reusable.

The present invention is intended to solve the above-mentioned drawbacks, and is aimed at making it possible to thaw the secondary side with the flowing water when the secondary side is frozen due to residual water, thereby preventing the inability to pass water. In order to achieve this purpose, the anti-freezing water draining device of the present invention urges a check valve so that the valve port is closed by a spring, and provides a drain plug on the primary side of the check valve.
An operating shaft is provided on the primary side of the check valve so that it can move forward and backward so that its tip faces the check valve, and the operating shaft is biased by a spring stronger than the spring to reduce the elastic force of the spring. The tip of the operating shaft presses the check valve to open the valve port, and the operating shaft releases pressure on the check valve by receiving water pressure on the primary side. When the water drain valve is loosened and water is drained from the primary side, the water pressure on the primary side that was applied to the piston disappears, and the tip of the operating shaft is activated by the action of a strong spring. By pressing the check valve and opening the valve port, water can also be drained from the secondary side.

An embodiment of the present invention will be described below with reference to FIGS. 4 to 6. The check valve 1 is a normal one, and a four-pronged guide fitting 2 is fixed to the back side with screws 3 and is arranged in a valve seat 4 so as to be movable forward and backward. is biased in the direction of closing. A drain hole 7 is provided on the primary side of the check valve 1, and the drain hole 7 is normally closed by a drain plug 8. The drain plug 8 is screwed into the cylindrical part 9, and a T-shaped through hole 8' is formed in the center, and a rubber 10 that tightly contacts the drain hole 7 is fixed to the inner end surface, and the other end has a T-shaped through hole 8'. A knob 11 is formed on the outer periphery with splines to prevent slipping. 12 has a check valve 1 at the tip.
A seal ring 14 is wound around the outer periphery of a piston 13 formed integrally with the operating shaft, and the piston 13 is attached to the primary side. It is slidably disposed in a cylinder 15 provided on the pipe wall while maintaining airtightness. Reference numeral 16 denotes a cap placed over the outer end opening of the cylinder 15, and the cap has a shaft hole 17 through which the operating shaft 12 passes, and a vent hole 18 for communicating the inside of the cylinder with atmospheric pressure. cylinder 1
The inner end of piston 5 communicates with the primary side through a communication hole 19 so that the inner surface of piston 13 receives water pressure from the primary side. Then, the elastic force of a spring 20 whose one end is fixed to the cap 16 is applied to the outer surface of the piston 13, and the spring 20 is made stronger than the spring 5, so that when there is no water pressure or the like, the elasticity of the spring 20 is applied. Due to the generated force, the operating shaft 12 pushes the check valve 1 to the left in the figure, causing the valve port 6 to open.

In the antifreezing water draining device constructed in this way, under normal conditions, when there is water flowing in the forward direction, the check valve 1 opens the valve port 6, and when the water flow is stopped, the check valve 1 opens the valve port 6. 5 Spring 5 as shown in Figure 5
Due to its elasticity, the check valve 1 comes into close contact with the valve port 6 to prevent backflow. At this time, water pressure on the primary side acts on the piston 13 to move the actuating shaft 12 rightward in the figure against the elastic force of the spring 20, causing the tip to move away from the check valve 1. Then, by operating the knob 11 to loosen the drain plug 8 and separate the rubber 10 from the drain hole 7 and open the drain hole 7, the water on the primary side of the pipe will flow out through the drain hole 7 and the through hole 8'. It is discharged.
At the same time, the water pressure on the primary side decreases and piston 13
The spring 20 loses its support due to water pressure.
The operating shaft 12 moves to the left in the drawing due to the elastic force, and as shown in FIG. The valve is actuated in the opening direction by the force, and the valve port 6 is opened. Therefore, when draining water, the water on the secondary side also flows through the valve port 6.
It flows into the primary side through the drain hole 7 and is constantly discharged. In this way, if the check valve 1 is held open and the remaining water freezes, the flowing water will flow into the valve chamber 3 from the valve port 6 when water is recirculated, and the check valve 1 and the guide fitting 2 will freeze. Even if it is, the running water will easily thaw it. Therefore, the check valve 1 quickly recovers its function.

As described in the embodiments above, in the device of the present invention, an operating shaft that operates in response to water pressure is provided on the primary side of the check valve so that it can move forward and backward, and the operating shaft is attached by a spring stronger than the spring of the check valve. When the drain valve is opened by pressing the spring, the actuating shaft opens the check valve by the action of the spring, so by operating one drain valve, the primary and secondary sides of the check valve can be opened at the same time. Not only can it be drained and is easy to operate, but the check valve is held open when water is drained, so even if the remaining water freezes, running water will flow to the secondary side when water is recirculated, making it easy to thaw. There is no possibility that the water will not be able to flow because of the water flow, and the function will be reliably restored by re-watering.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a hot water mixing faucet, FIG. 2 is a cross-sectional view taken along the line X--X, and FIG. 3 is a cross-sectional view taken along the line Y--Y in FIG. FIG. 4 is a longitudinal sectional view showing one embodiment of the present invention, and FIGS. 5 and 6 are longitudinal sectional views showing its operating state. 1...Check valve, 5...Spring, 6...Valve port, 8...Drain plug, 12...Operating shaft, 13...Piston, 15...Cylinder, 19...Communication hole, 2
0...Spring.

Claims (1)

[Claims] 1. Force the check valve so that the valve port is closed by a spring, provide a drain plug on the primary side of the check valve, and move the operating shaft so that the tip faces the check valve. The actuating shaft is provided on the primary side so as to be movable forward and backward, and the actuating shaft is biased by a spring stronger than the spring, and the elastic force of the spring causes the tip of the actuating shaft to press the check valve and open the valve opening. A water draining device for preventing freezing, characterized in that a piston is fixedly installed on the operating shaft to release pressure on the check valve by the operating shaft by receiving water pressure on the primary side. .