JPS5825019Y2 - Intake valve device for cold regions - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an intake valve device for water supply and hot water supply piping used in cold regions.

Traditionally, in cold regions, drain valves are used to drain water from pipes during the winter to prevent water from freezing, but in order to do so, it is necessary to temporarily open the pipes downstream of the drain valve to the atmosphere. Generally, air is taken in from that part by opening the collar.

However, even if the door is opened, depending on the structure of the house, there may be long sections of horizontal piping or sections with many bends in the downstream piping of the drain valve. If water remains, it may freeze and cause an accident.

As an example of an attempt to eliminate the above-mentioned drawbacks, intake valves have been provided at appropriate locations in the piping.

The intake valve is closed when the water drain valve is in the water supply state, and the intake valve is open when the water drain valve is in the drain state, allowing air to be taken in from the outside through the intake valve and water in the pipes drained to the drain valve side and the water drain valve side. It is considered.

However, with conventional intake valves, water can come into contact with the valve element of the intake valve due to sudden pressure fluctuations caused by water hammer, etc., and the water that comes in contact with the valve element of the intake valve freezes, causing the intake valve to function normally. may be lost.

For example, water droplets that were in contact with the valve body of the intake valve after draining water through the drain valve may freeze under freezing temperatures, and depending on the type, if the water droplets freeze with the intake valve open, the water droplet may freeze when the intake valve is open. If an accident occurs where water spews out from the intake valve, or if the intake valve freezes when it is closed, when the drain valve is immediately changed from the water supply state to the drain state, air cannot be taken in and the water in the pipes freezes. It was an accident.

The purpose of the present invention is to solve the above problems, and the specific configuration for achieving the purpose is as follows.

According to the attached drawing, in an intake valve device for cold regions that is installed in the piping on the downstream side of the drain valve, there is a valve at the top of the intake valve device that connects to the atmosphere through the intake valve device when the pressure inside the piping is lower than atmospheric pressure. A check valve 10 is provided which can communicate with each other and shut off when the opposite occurs, and an empty cylinder long chamber 21 is provided below the check valve chamber 11 containing the check valve 10. and the check valve chamber 11 containing the check valve 10, an air chamber 22 is provided below the air cylinder long chamber 21, and the air chamber 22 and the air cylinder long chamber 21 are communicated, A resistance plate 23 is provided in the air chamber 22 to stabilize the water head surface.
A floating valve chamber 17 containing a floating valve 16 is located below it.
This is an intake valve device for cold regions characterized by providing a floating valve chamber 17 and communicating with the air chamber 22.

Therefore, in this invention, as can be seen from the condition that the product of air volume and pressure in a certain closed space is constant, the water head surface reaches the upper check valve chamber due to the rise in water head due to water pressure fluctuations. In order to prevent this from happening, we designed a structure that closes the purgatory even at a certain low water head, and even if the purification table becomes inoperable due to ice formation under freezing temperatures, the air stored in the air chamber will close the purgatory. The water head that fills the air cylinder length chamber and rises due to disturbance by the resistance plate stored in the air chamber,
It is characterized by changing the water head surface to a stable one and preventing even a single drop of water from coming into contact with the check valve located at the top.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing an example of a piping state in which the present invention is implemented, in which a drain valve 2 provided with a drainage opening 3 is connected to a water supply pipe 1, and from the drain valve 2 downstream piping 4, 5, 7.8, and a collar 9 etc. is installed at the end of the piping.

The intake valve device 6 for cold regions according to the present invention is installed at the apex A of the pipe 4 in this embodiment.

Now, when the drain valve 2 is changed from the water supply state to the drain state, air is taken in from the intake valve device 6, and water in the pipe 4 is drained into the ground through the drain port 3 of the water drain valve 2, and the water is drained into the ground through the pipes 5, 7, 8. The water is drained out of the pipe through a drain or the like that is open to the atmosphere.

FIG. 2 is a longitudinal sectional view showing one embodiment of the intake valve device 6 shown in FIG. 1. FIG.

The mounting portion 25 for mounting on a pipe or the like has a structure that can be easily mounted and removed, and is in contact with the water head inside the pipe into the opening 20.

Therefore, when the drain valve is changed from the drain state to the water supply state, the supplied water fills the pipe while exhausting the air inside the pipe.

At this time, the check valve 10 disposed at the upper part of the check valve seat main body 2 is caused by the air passing through the intake valve device and about to be exhausted.
6 on the valve seat surface 13 to stop exhaust from the intake valve device.

The check valve 10 is equipped with an O-ring 12 to provide airtightness.

Also, the check valve 10 is housed in a check valve chamber 11, and the spring 1
4 and a spring presser 15.

Inside the intake valve device, a certain space is formed by the closed check valve, and the water head that has passed through the opening 20 rises by an amount equivalent to the pressure, and when it reaches the purgation chamber 17, the purgation 16 floats on the water head. It is seated on the purification seat 19 of the purification seat main body 27 and is formed to prevent further water from entering into the intake valve device.

Therefore, even if the purification 16 freezes on the valve stand 18 and becomes inoperable under freezing temperatures, the water head will stop halfway through the air cylinder long chamber 21 while being compressed by the water pressure by the air stored in the air chamber 22. The water head does not reach the upper check valve.

Further, the turbulent and rising water head is stabilized by the resistance plate 23 housed in the air chamber 22.

Next, when the drain valve is changed from the water supply state to the drain state and the drain valve is opened to the atmosphere, the pressure inside the pipe decreases and the water head drops, so that the purifier 16 is removed from the valve seat 19.

As the water in the pipe is drained from the drain port of the water drain valve, the pressure in the pipe becomes lower than the atmospheric pressure, so the check valve 10 disposed at the top moves away from the valve seat 13 and passes through the intake passage 24 to release the atmosphere. The water that is drawn into the pipes is completely drained through the drain port of the drain valve and the opening of the drain valve.

Also, at the top position of the intake valve device, there is a water stop valve 28 that stops water from spouting out in the event of a malfunction of the check valve 10 and the purification 16, and it has a rubber backing 29 to completely shut off the water.
This is provided.

As other embodiments, without departing from the gist of the present invention, it is possible to change the shape and material of the check valve and purgation disposed at the top, change the shape of the air cylinder long chamber, or change the volume of the air chamber. Various other methods can be considered, such as changing the shape and number of resistance plates.

The intake valve device of this invention has a check valve in the upper part that can be closed with a small flow of air, and a structure in which the purifier is housed in the lower part to close the purifier with a low water head and prevent the water head surface from entering the air chamber. Even if the valve stand becomes inoperable due to ice build-up under freezing temperatures, the product of air volume and pressure remains constant due to the air stored in the intake valve device and the air cylinder length chamber. Under these conditions, the distance between the check valve body and the water head surface can be increased, and it is possible to prevent even a single drop of water from coming into contact with the check valve body.

In addition, the turbulent water head surface can be stabilized by the resistance plate housed in the air chamber.

Due to the various effects described above, the valve can operate reliably even in a low-temperature atmosphere, so it can be used as an intake valve device in a cold region with reliable valve operation.

[Brief explanation of the drawing]

FIG. 1 is a state diagram of piping in which an intake valve device is installed, and FIG. 2 is a longitudinal sectional view of an embodiment of the present invention. 1... Water supply pipe, 2... Water drain valve, 3...
・: Drain port, 4.5° 7.8...Gas pipe, 9.
・・・・・・Crash, 6・・・Intake valve device, 10・
...Check valve, 11...Check valve chamber, 12.
...O-ring, 13...Check valve seat, 1
4...Spring, 15...Spunong presser, 16...Purgatory body, 17...Purification chamber, 18...Valve stand, 19 ...Purity seat, 20...Opening, 21...Air cylinder length chamber, 22...Air chamber, 23...Resistance plate , 24...Intake passage, 25...Mounting portion, 26...Check valve seat body, 27...Purity seat body, 28... ...Water stop valve, 29...
Rubber backing.

Claims (1)

[Scope of utility model registration request] In an intake valve device for cold regions that is installed in the piping downstream of the water drain valve, a check valve is installed at the top that can communicate with the atmosphere when the pressure inside the piping is lower than atmospheric pressure, and shut it off when the opposite is true. , an air cylinder long chamber is provided below the check valve chamber containing the check valve, and the air cylinder long chamber and the check valve chamber containing the check valve are communicated with each other, and the air cylinder long chamber is communicated with the check valve chamber containing the check valve. An air chamber is provided below, and the air chamber communicates with the air cylinder length chamber. A resistance plate for stabilizing the water head is housed in the air chamber, and a float housing a float valve is housed below the air chamber. An intake valve device for cold regions, characterized in that a valve chamber is provided, and the floating valve chamber communicates with the air chamber.