JPS5920072B2 - liquid open air close valve - Google Patents

Description

[Detailed description of the invention] The present invention relates to a liquid open/air close valve.

For example, such a valve can be installed in a sprinkler piping system, especially a riser pipe, to prevent so-called dripping (a phenomenon in which liquid drips only in the vicinity of the sprinkler as the injection pressure decreases) and to prevent the liquid from dripping in the piping. It is effective in dispersing and finishing most of the liquid. When spraying a liquid such as a pesticide, instead of pumping the pesticide, a gas such as air is sent to spread most of the pesticide, and when the air reaches the valve in the pipe, it is shut off. Don't let it reach the sprinklers. In other words, since air is not unnecessarily injected from the sprinkler, the capacity and cost of the air pressure feeding equipment can be significantly reduced. An example of such a valve is
Gas shut-off valves such as those shown in -869 are known.

However, this gas cutoff valve has a structure in which the gravity of the float, which is greater than the pressure of the gas, opens and closes the valve, so the device is large and heavy, making it difficult to handle. The present inventors have already developed a light and easy-to-handle gas cut-off valve in JP-A-54-123735 that closes the valve by itself using gas pressure. A liquid outlet is provided and when the liquid flows, the liquid outlet is opened and allowed to flow due to the buoyancy of the float and/or the pressure fluid resistance, and on the other hand, as the gas reaches and the float descends, the pressure of the gas increases. I applied for a gas cutoff valve that closes the liquid outlet on its own and blocks the flow of gas, but after further intensive research, I found a retractable float support with low fluid resistance at the fluid outlet on the lower surface of the float. By providing this, the gas cutoff valve operates more stably without malfunction.

Successfully developed a liquid open/air close valve. The liquid open/close valve of the present invention has a constant pressure open/close valve that opens at a certain pressure or higher inside a container 2 which has a fluid outlet part 1a in a part of the fluid pipe line and a fluid inlet part 1b in the lower part. It has a float chamber 4 having a valve 3, a fluid inlet 4b, an outlet 4c, and a constant pressure opening/closing valve hole 4a, and when the liquid is flowing in the float chamber,
It floats up due to buoyancy and pressure fluid resistance, opens the inlet port 4b and the outlet port 4c, allows the gas to flow, and descends under the condition that the liquid in the float chamber is replaced with gas, and due to the pressure of the gas, the inlet port 4b opens. The valve has a float 5 for closing the outflow port 4c, and is a liquid open/air-closed valve having a float support made of a spring at the fluid outflow portion of the lower surface of the float.

An embodiment of the present invention will be described below with reference to the drawings, but the present invention is not limited to this embodiment.

In this figure, 1 is a riser pipe of a sprinkler, the upper end of which is connected to the sprinkler. 2 is a main body container, which has a fluid outlet part 1a at the upper part and an introduction part 1b at the lower part.
have.

3 is an automatic release valve, 4 is a float chamber, 4a is a valve hole for the automatic release valve, 4b is a fluid inlet, 4c is a fluid outlet, 5 is a float, 5
a is a water pressure receiver, 5b is a fluid outlet valve, 5c is a gas hole, and 6 is a float support consisting of a spring, which constitutes the operating part of this device, and the float 5 moves up and down inside the float chamber 4. By opening and closing the fluid outlet 4c provided in the float chamber 4, the flow of liquid and gas is controlled.However, when neither liquid nor gas is flowing and the float is not in operation, the float 5 is connected to the float support 6.
, and maintains a state away from the fluid outlet 4c of the float chamber 4.

When a liquid with a pressure higher than the pressure at which the constant pressure on/off valve 3 opens, the constant pressure on/off valve 3 opens and gas and liquid flow out from the constant pressure on/off valve hole 4a.

The float 5 floats up by receiving the buoyancy force of the liquid and the ejection force due to the pressure fluid resistance at the water pressure receiver 5a, and opens the fluid outlet 4c to allow the liquid to flow out. Next, constant pressure on/off valve 3
When gas at a pressure below the opening pressure enters the float chamber through the riser pipe 1 and the liquid inlet 4b, the float 5 passes through the gas hole 5c and descends due to the pressure of the gas accumulated at the top of the float chamber and gravity. Then, the outlet 4c is closed to cut off the gas flow.

Unlike conventional valves, the valve of the present invention does not allow the float to descend due to a small amount of air in the piping, resulting in incomplete disposal of residual liquid.
This solves the problem that even when liquid is flowing, the float is sucked into the fluid outflow part of the float chamber before the float rises completely, and the amount of outflow liquid is halved.

In other words, since the fluid outflow part on the lower surface of the float has an extendable float support 6 with low fluid resistance, the float 5 will only descend to a certain height due to its own weight even with a small amount of air accumulated in the piping. Therefore, the fluid outflow portion 4c is not completely blocked, so that the remaining liquid can be completely processed. but,
When a large amount of compressed gas for residual liquid treatment is supplied, the gas passes through the gas hole 5c from the fluid inlet 4b, accumulates in the upper part of the float chamber, and causes the float 5 to descend reliably.
e to block the outflow of gas. Also, float 5
is supported by the float support 6 when not in operation and is away from the fluid outlet 4c of the float chamber 4, so there is no malfunction such as when the float 5 is sucked into the fluid outlet 4c of the float chamber 4 at the beginning of liquid flow, and the float 5 rose steadily, and the flow of liquid became more reliable. In the device of the present invention, the constant pressure on/off valve 3 may be of any type, such as one using a spring or a heavy object made of metal, synthetic resin, etc., as long as it opens and closes at a predetermined pressure, but it is preferable that the constant pressure on/off valve 3 is It is preferable to use a spring that does not come loose.

Automatic on-off valves that use heavy objects can only be installed vertically, but by using springs, they can be installed diagonally or horizontally and still be effective. The float 5 is provided with a recessed water pressure receiving portion 5a so as to be easily subjected to pressure fluid resistance.

More preferably, a gas hole 5c is provided so that the gas flows into the upper part of the float chamber when the gas flows into the float chamber. The weight of the float 5 floats due to pressure fluid resistance,
Any type of structure may be used as long as it drops due to gravity and the pressure of the gas remaining in the upper part of the float chamber when the gas flows in. The float support 6 may be made of any material as long as it has a structure capable of supporting the weight of the float and is stretchable and resilient. Although any material may be used for the device of the present invention, materials with excellent corrosion resistance such as synthetic resin, rubber, aluminum, and stainless steel are preferred.

As is clear from the above description, the device of the present invention allows liquid to flow but blocks gas.

By using the device of the present invention, a small and lightweight liquid-open/air-close valve can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of the main parts of the device of the present invention.

Claims (1)

[Claims] 1. A container that has a fluid outlet at the top and an inlet for the same fluid at the bottom, has a constant pressure on-off valve that opens above a certain pressure, a fluid inlet, an outlet, and a valve seat for the constant pressure on-off valve inside the container. It has a float chamber, and when the liquid is flowing in the float chamber, it floats up due to buoyancy and pressure fluid resistance, opens the inlet and outlet and allows the liquid to flow, and converts the liquid in the float chamber into gas. In a valve consisting of a float that descends under conditions of displacement with gas and closes an inlet and an outlet due to the pressure of the gas, a float support consisting of a spring is provided on the bottom surface of the main container directly below the valve for the fluid outlet of the float. The liquid opens and closes the valve.