JPH04113381U - automatic drain valve - Google Patents

Abstract

(57) [Summary] [Purpose] Automatically drains accumulated water in taps such as hot and cold mixer taps, which previously had to be drained manually to prevent freezing, by sensing temperature.
Our objective is to provide automatic water draining equipment. [Configuration] The automatic drain valve has an upward facing valve seat 2 in the middle part.
, a valve box 1 having a drain port 3 at the bottom end, and a water inlet port 7 at the top.
a valve cover 5 having a mounting screw 6 and connected to the upper end of the valve box; a valve body 8 that is housed in the valve case and seats on the valve seat to shut off water; A shape memory spring 11 made of a shape memory alloy having a transformation point in a slightly higher temperature range than 0° C. is fixed to the valve body and applies a downward pressing force to the valve body; A bias spring 12 provides a pressing force.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is designed for use in plumbing fixtures in cold regions, especially in end fixtures such as hot water mixer faucets, etc. This invention relates to an automatic drain valve that automatically drains water.

0002

[Conventional technology]

Conventionally, in cold regions, anti-freeze water taps or drain valves are used to prevent damage to pipes. Water has been drained to prevent freezing. However, freezing accidents caused by forgetting to operate Therefore, in recent years, sensors have been used to measure water or atmospheric temperature. When the temperature approaches freezing, the motor automatically rotates and moves the valve to close the anti-freeze faucet. This is a so-called automatic water drain system with a sensor that drains water by operating a drain valve. location is beginning to be used. In the above case, to drain the water, use a faucet etc. In order to avoid the unreasonable need to introduce air and manual operation, it should be placed near a faucet etc. Install an air supply valve nearby, and when the water draining device is in the draining state, air will be released from the air supply valve. A commonly used method is to drain the water from the pipes and faucets by sucking water from the pipes and faucets.

0003 However, for example, a mixer faucet with hot water or cold water has a complicated shape, and due to its structure, it is difficult to In some cases, water remained in the valve section, resulting in accidents that froze and caused damage. that To prevent this, install a drain valve at the bottom of the hot water mixer faucet and open it to drain the water from the valve. In fact, in cold regions, you can use a mixer tap with a water drain valve. is often used, but instead of manually draining water, an automatic water draining device with a sensor is used. There is no point in using it anymore.

0004

[Problem that the idea aims to solve]

Therefore, by simply replacing the drain valve of a conventional hot and cold water mixer faucet, it will automatically turn off when the temperature reaches freezing point. The challenge of this invention is to provide an automatic drain valve that can dynamically drain accumulated water inside the sieve. be.

[0005]

[Means to solve the problem]

The automatic drain valve of this invention has a valve box with an upward facing valve seat in the middle part and a drain port in the lower end. and a valve cover connected to the upper end of the valve box and having a water inlet and a mounting screw at the upper part; A valve body seats on the valve seat to stop water, and a downward pressing force is applied to the valve body when it is locked to the valve cover. A shape memory alloy made of a shape memory alloy with a transformation point slightly higher than 0°C, giving a spring, and a bias spring that is locked to the valve box and applies an upward pressing force to the valve body. When the water temperature is high, the shape memory spring overcomes the force of the bias spring. When the water temperature drops to around 0℃, the above force is applied to press the valve body against the valve seat. The force relationship is such that the valve body is reversed and separated upward from the valve seat.

[0006]

【Example】

An embodiment of the present invention is shown in Fig. 1, where 1 is a valve box with a valve seat 2 in the middle and a lower end. A drain port 3 is provided in the valve seat 2, and a large diameter valve wall 4 is formed above the valve seat 2. 5 is the valve box 1 It is a valve cover that is connected to the upper end, and has mounting screws 6 and 6 that connect to the above-mentioned hot water mixing faucet, etc. and a water inlet 7. 8 is a valve body that moves up and down using the valve wall 3 as a guide; A dovetail groove 9 is drilled in the lower part, and the packing 10 that seals the valve seat 2 is installed so that it does not come off. do. Reference numeral 11 is made of a shape memory alloy that is locked to the valve lid 5 and applies a downward force to the valve body 8. It is a shape memory spring, and 12 is a via that is locked to the valve body 1 and applies a lifting force to the valve body 8. It's a spring.

[0007] The shape-memory spring 11 can be used at water temperatures slightly higher than 0°C, for example, from 1 to 5°C. It is designed to undergo tensite transformation, and in a higher temperature range, the bias spring 12 is The valve body 8 is pressed against the valve seat 2 immediately, and in the low temperature range below the transformation point, compression is reduced. The bias spring 12 causes the valve pair 8 to separate from the valve seat 2. Let it rise.

[0008] In this embodiment, in addition to the above-mentioned force, water pressure acts downward on the valve body 8. Therefore, during normal water flow, even if the temperature is below the transformation point, it is not pressed by water pressure. The valve body 8 remains seated on the valve seat 2, but the antifreeze faucet etc. is in the drain state. If the above water pressure disappears, if the water temperature is below the transformation point, the bias valve should be removed. The valve body 8 rises due to the spring 12, and the water from the water inlet 7 passes through the gap 13 between the valve wall 4 and the valve body 8. If the water temperature is higher than the transformation point, drainage will occur. There will be no such thing.

[0009] In addition to the above-mentioned embodiment, our school's proposal is to form the valve box side having the valve cover 5 and the valve wall 4 in one piece. It may be connected to the valve box side that has the drain port 3 and the valve seat 2, and a pad may be attached to the valve body 8. Instead of installing the gasket 10, the packing 10 can be installed on the valve box 1 side and also used as the valve seat 2. Good. For the sake of explanation, I will explain the case where our school's proposal is installed vertically. However, it is of course possible to install it horizontally, or even use it as an intake valve. It is also possible to do so. At that time, the drain port 3 becomes an intake port.

0010

[Effect of the idea]

As described above, with this invention, an automatic drain valve can be realized with a very simple structure. Therefore, when using an automatic water drain device with a sensor, replace the water drain valve on the hot water mixing faucet. You can completely drain the water without doing anything by just doing this, and you can prevent the hot water mixer faucet from freezing. In addition to preventing damage, water can be drained using a regular antifreeze faucet or drain valve. It can also be attached to piping joints and used as a water drain valve. Whether it is used as an intake valve or as an intake valve, Even if it is in a water state, the water will not come out unless it gets close to freezing temperature, so throw away wasted water. It also has the advantage of being economical as there is no need to do so.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

[Explanation of symbols]

1 Bento box 2 Valve seat 3 Drain port 5 Valve lid 6 Mounting screw 7 Water inlet 8 Valve body 11 Shape memory spring 12 Bias spring

Claims (1)

[Scope of utility model registration request] Claim 1: A valve box having a drain port at its lower end and an upwardly facing valve seat at its top; a valve cover connected to the top end of the valve box and having a water inlet and mounting screws at its top; and a valve cover seated on the valve seat. a shape memory alloy spring made of a shape memory alloy having a transformation point in a slightly higher temperature range than 0° C., which is latched to the valve body and applies a downward pressing force to the valve body; An automatic drain valve comprising a bias spring that is locked to the valve box and applies a downward pressing force to the valve body.