JPS5822449Y2 - Suction pumping circulation air valve - Google Patents

Description

[Detailed description of the invention] This invention is a valve that is installed in the middle of a fluid pipeline such as a water main and used to remove air mixed in the pipeline.
That is, the present invention relates to an air valve, and more particularly, to an air valve having a function of automatically replacing the flow of fluid stagnant within a valve box.

Conventionally, air valves installed in pipelines are as shown in Figure 1.
The structure specified in JIS-B-2063 water supply air valve (single port) is used.

Here, A is the valve box, the mouth is the float valve, C is the float valve guide, 2 is the top cover, E is the conical valve seat, HO is the valve seat holder, G is the top, C is the vent, and S is the cock. It is.

This is installed above the main pipe using a T-shaped pipe or a plug-in pipe.

In addition, this conventional air valve has a structure in which the fluid inlet/outlet passage connecting the inside of the air valve and the main pipe is a single opening hole, and the diameter of the single opening hole is small. , ■
When the main pipe line is full of water and no air is mixed in, the air valve is not affected by the flowing water in the main pipe, and the water that remains in the valve box of the air valve becomes completely water-stopped. ■When air is mixed into the flowing water in the main pipe (conventionally, in this case, it was expected that the water stagnant in the valve box would be replaced.

), mixed air tries to be introduced into the air valve, but due to the competitive phenomenon between the air bubbles and the stagnant water, the air bubbles are not introduced smoothly into the valve box, and the stagnant water in the air valve box ends up in a water-stop state. .

In this way, with conventional air valves, the water inside the air valve box becomes static, so the rust on the inner wall of the valve box causes the water to appear red and cloudy, and the suspended fine particles in the red water aggregate and become coarse. They become suspended particles and cause malfunctions in the air valve's intake and exhaust operations.

Further, rust is trapped on the joint surface between the conical valve seat and the float valve, causing water leakage on the valve seat and causing a water leakage accident.

Furthermore, in water supplies, chlorine is added to sterilize bacteria and algae and to thin the membranes, but after the residual chlorine contained in the tap water is consumed and disappears inside the air valve box, the water enters a state of suspended animation. Certain types of bacteria and algae that had been in the area will come back to life and provide a suitable place for their growth, which is also undesirable from a sanitary standpoint.

In order to eliminate these drawbacks of conventional air valves, it is necessary to take measures to constantly replace the fluid in the valve box, but when the pipe is full of water and no air is mixed in, Such means have not yet been proposed.

Therefore, the air valve of the present invention uses the flow of fluid even when the pipe is full of water and no air is mixed in, so that the fluid in the valve box does not stagnate and can constantly replace the fluid. Consider it a technical issue.

Note that a means for changing the flow of fluid in the valve box when air is mixed in the flowing water was proposed in Utility Model Application No. 72633/1984 at the same time as this application.

The air valve of the present invention adopts the following configuration (technical means) in order to achieve the above technical problem.

■In an air valve that is installed by communicating the opening at the bottom of the valve box with the communication hole in the branch pipe section of the main pipe, ■A constriction part is formed at the corresponding position of the main pipe to which the air valve is installed, and ■Float valve The guide is disposed within the valve box with a predetermined gap from the inner surface of the valve box to form a drainage chamber, and has an opening with a water inlet at the bottom and a water outlet at the top, and has a substantially closed structure on the outside. (1) The suction pumping tube consists of an inlet passage body and an outlet passage body which are formed separately from each other, and is installed in the communication hole of the branch pipe section interposed between the inside of the valve box and the main pipe, and (2) the above-mentioned The introduction channel body of the suction pumping tube has an introduction hole inside, and its lower opening communicates with the main pipe, and its upper opening communicates with the water inlet of the float valve guide. The outlet passage body has an outlet hole therein, and the outlet at the lower opening thereof is arranged near the throttle part toward the downstream side of the main pipe,
The upper opening communicates with the drainage chamber of the valve box.

This configuration provides the following effects.

That is, when the fluid flowing in the main pipe reaches the branch pipe section where the air valve is installed, the opening cross-sectional area is reduced by the constriction part, so the flow velocity increases and a pressure drop occurs at the constriction part.

Due to this pressure drop, the fluid in the outlet passage body, which is disposed with its opening facing the constriction part, is sucked and discharged into the main pipe.

As the fluid in the outlet passage body is suctioned, the fluid in the drainage chamber and furthermore the fluid in the valve chamber of the float valve guide is also suctioned.

As a result, a part of the fluid flowing in the main pipe is sucked and pumped into the valve chamber from the water inlet of the float valve guide through the introduction hole of the introduction passage body.

Through this series of actions, a part of the water that always flows in the main pipe is introduced into the valve box of the air valve, and the flow of water in the valve box is replaced without stopping the water.

Note that the specific gravity (maximum at 4°C) of the water in the drain chamber that has been cooled by outside air through the valve box becomes lighter, so an upward force acts on the water in the drain chamber. Since the descending suction force is a large force, the water cooled by the outside air in the exhaust chamber descends and is led out through the outlet hole.

The air valve of the present invention has the following unique effects.

■ The fluid inside the valve box is replaced by the Venturi effect, so there are no mechanical parts and the mechanism is simple.

■ The exchange of fluid in the valve box is carried out constantly as long as there is flowing water in the main pipe, and no dead water is generated in the valve box.

■ Air bubbles mixed in the fluid flowing in the main pipe are actively sucked into the valve box along with the flowing water by the suction pump cylinder, promoting the exhaust action of the air valve.

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 2 is a longitudinal sectional view of one embodiment, and A is its air valve.

A float valve guide 16 is fixed to the inside of the valve box 15 of the air valve A by an upper cover 22, and a conical valve seat 19 for sucking and exhausting air is fixed to the upper cover 22 via a valve seat retainer 21.
Air vents 20 are formed.

The float valve 1 is installed in the valve chamber 13 inside the float valve guide 16.
8, and the float valve guide 16 is formed with a water inlet 12 through which water flows in and a water outlet 17 through which water is discharged.

An inlet passage body 5 having an inlet hole 4 formed therein and an outlet passage body 6 having an outlet hole 7 and a spout 8 formed therein are integrated into a pipe that communicates the T-shaped branch pipe portion 23 and the valve box 15 of the air valve. The connected suction pumping cylinder B is inserted and fixed by being clamped between the branch pipe part flange 10 and the air valve flange 11.

The float valve guide 16 and the introduction passage body 5 are the float valve guide 1
The peripheral portion of the water inlet 12 of No. 6 and the upper end opening of the introduction passage body 5 are joined together.

A gap in the valve box formed by the inner surface of the valve box 15 and the outer surface of the float valve guide 16 is a drainage chamber 1 for draining water.
It is 4.

The operation of this embodiment will be explained.

When flowing water passes through the inlet flange 2 of the main pipe 1 and flows to the outlet flange 3, the water that has passed through the inlet flange 2 has a flow rate that decreases because the opening cross-sectional area of the main pipe 1 is gradually reduced. The flow rate gradually increases and reaches the maximum flow velocity at the constriction section 9.

Then, as it approaches the water outlet side flange 3, the opening cross-sectional area gradually increases and returns to its original opening cross-sectional area, so that the flow rate of the flowing water returns to the initial flow rate.

Therefore, a pressure drop occurs within the constriction section 9, and the outlet passage body 6
The water in the outlet hole 7 is sucked toward this pressure drop part, passes through the spout 8, and is ejected into the constriction part 9.

Then, in response to the suction in the spout hole 7, the water in the drain chamber 14 is also sucked and descends, and in turn, the water in the valve chamber 13 also flows through the water outlet 1.
A part of the water that has passed through 7 and been sucked into the drain chamber 14 and has also passed through the water inlet side flange 3 passes through the introduction hole 4 of the introduction passage body 5 and the water inlet 12 of the float valve guide 16,
The water is sucked and pumped into the valve chamber 13.

This suction pumping circulation operation is performed as if the water inlet side flange 2
A part of the water that has passed through is pumped up and into the introduction hole 4, passes through the water inlet 12, and is introduced into the valve chamber 13.The water introduced into the valve chamber 13 flows through the float valve 18 and the float valve guide 16. It shows a series of flows in which the water passes through the gap formed by the water, is discharged to the drainage chamber 14, passes through the outlet hole 7, and is ejected from the ejection port 8 into the constriction part 9.

Such a circulation operation is performed by the fluid flowing from the water inlet side through the main pipe 1 to the water outlet side.

The water spouted to the throttle part 9 is mixed with water that is not sucked and pumped inside the throttle part 9 and on the water outlet flange 3 side of the main pipe 1, and flows through the water outlet flange 3 to the downstream side of the main pipe.

In addition, when air is introduced into the valve chamber 13 or when the water pressure inside the valve chamber 13 falls below the outside pressure, the air is discharged and sucked in using the same exhaust and intake operations as conventional air valves. It is something to do.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a conventional air valve for water supply, and FIG. 2 is a vertical cross-sectional view of an embodiment of the air valve of the present invention. A: Air valve, B: Suction pump, 1
...Main pipe, 4...Introduction hole, 5...
...Introduction road body, 6...Output road body, 7...
・Outlet hole, 8... Spout, 9... Throttle part, 12... Water inlet, 14... Drainage chamber, 15... - Valve box, 16... float valve guide, 17... water outlet, 23... branch pipe section.

Claims (1)

[Claims for Utility Model Registration] In an air valve that is installed so that the opening at the bottom of the valve box 15 communicates with the communication hole of the branch pipe section 23 of the main pipe 1, the corresponding position on the main pipe 1 where the air valve is installed. Aperture part 9
The float valve guide 16 is arranged within the valve box 15 with a predetermined gap from the inner surface of the valve box to form a drain chamber 14, and
The outside has a substantially closed structure with an opening of a water inlet 12 at the bottom and a water outlet 17 at the upper part, and the suction pumping tube B consists of an inlet passage body 5 and an outlet passage body 6 which are formed separately from each other. ,
It is installed in the communication hole of the branch pipe part 23, interposed between the inside of the valve box 15 and the main pipe 1, and the introduction passage body 5 of the suction pumping tube has an introduction hole 4 inside, and a lower opening thereof. is communicated with the main pipe, and its upper opening is communicated with the water inlet 12 of the float valve guide 16, and the outlet passage body 6 of the suction pump cylinder has an outlet hole 7 inside,
The spout 8 of the lower opening is arranged toward the downstream side of the main pipe near the throttle part 9, and the upper opening is communicated with the drain chamber 14 of the valve box 15. Suction pumping circulation type air valve.