JPS5836228B2 - air valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air valve that is installed primarily in a pipeline as a water supply device and has the function of discharging air flowing through the pipeline together with water.

Conventional air valves with a pedestal for supporting a float valve with a bottom part inside the valve box are shown in (a) Figure 1 of Utility Model Application No. 11617-1982, and (2) Figure 2 of Utility Model Application No. 48-91512. , etc., but these air valves are installed in pipelines, and when water is conveyed with a large amount of residual air in the pipeline, the residual air is pumped through the air valves due to the water supply in the pipeline. When the water that is being discharged and directly discharging air reaches the narrow L of the passage and the air intake/discharge port 8 of the air valve, the flow velocity becomes significant and the flow rate becomes large and first reaches the bottom 3 of the pedestal 4 in the valve box 7.
The water that first entered the air valve through the narrow space between the valve box 7 and the pedestal 4 continues to be discharged in large quantities out of the air valve through the intake and exhaust ports 9. During this time, the water that has accumulated slightly on the pedestal 4 will finally rise to the surface of the float valve 6a in the pedestal 4, and the float valve 6a will come into contact with the valve seat 10 and the air valve will be closed. drainage stops.

Therefore, the amount of water discharged from these air valves increases as the water delivery speed within the pipe increases.

Therefore, not only does the water leakage rate increase, which is uneconomical, but also the large amount of water discharged from the air valve forms sewage around the air valve and accumulates around the air valve. The practical use of these air valves may include things such as contamination of the inside of the pipe by water leakage, objects floating in wastewater getting stuck in the valve seat 10, etc., causing the air valve to lose its function, and increasing secondary disasters due to water leakage. The above problem is that social demands for early water supply in empty pipes for disaster recovery etc. are becoming stronger every year along with water sanitation issues.
Measures to address the above-mentioned problems with air valves have been urgently sought after.

As a countermeasure to the above problem, a relatively large hole was made at the bottom of the air valve so that when air was discharged from the air valve, the float valve would not be pushed up, and water would enter the air valve. Attempts have been made to prevent water from coming out of the air valve by colliding with the float valve through the hole and using the force to push the float valve up and seal it against the valve seat, but the hole at the bottom is too large and the air valve is blocked. If the flow rate of water inside the air valve is not fast enough, a large amount of water that has flowed into the air valve will be discharged from the air valve before the float valve contacts the valve seat and closes. If it is too thick, low pressure will be created due to the force of the air flow colliding with the float valve from the bottom hole and the high flow velocity of the air near the intake and exhaust ports in the valve box, that is, above the float valve, and the air valve will be able to absorb enough air from the pipe line. The float valve easily rises without evacuation and comes into contact with the valve seat, blocking the air valve, which has the disadvantage that the air valve cannot perform its exhaust function satisfactorily.

In view of the above-mentioned problems in the use of conventional air valves, the purpose of the air valve of the present invention is to construct an air valve that has the function of not draining the air valve regardless of the exhaust speed of the air valve. This is what I did.

In this invention, a float valve is seated and movable up and down in a pedestal having a hole communicating with the inside and outside for draining water and a bottom, and the outside of the bottom of the pedestal has a connection provided in the lower part of the valve box. It is installed inside the valve box so that the intake and exhaust ports face the pipe, and the upper part of the valve box is equipped with an intake and exhaust port, and around the bottom surface of the intake and exhaust port is a valve seat that the float valve contacts to open and close. In the air valve equipped with the formed valve lid, a hole is provided in the center of the bottom of the pedestal that passes through the top and bottom, a head of an appropriate size is provided at one end of the hole, and a pressing load is applied as appropriate using its own weight or a spring. An energized shaft of an appropriate length is inserted so that the head is positioned outside the bottom so that it can move up and down, and the tip of the shaft inserted into the hole approaches the bottom of the float valve seated on the pedestal. In addition, the air valve has a locking fitting on the shaft that prevents it from falling off at the bottom.The function and effect of the air valve of the present invention is that when the air valve of the present invention is installed in a pipe, the air in the pipe is controlled by the flow rate of the water in the pipe. When the air is pushed and flows into the air valve, which has a smaller cross-sectional area than the pipe, its flow velocity increases, and the air first collides with the head, but due to the weight of the shaft connected to the head or the spring, etc. The float valve is not pushed up via the shaft because it is appropriately biased to push it downward.

Therefore, the air that collides with the head or the bottom of the pedestal passes through the narrow space between the inner periphery of the valve box and the pedestal, and is discharged to the outside of the air valve through the intake and exhaust ports.

Subsequently, when the water in the pipe that has pushed the air reaches the intake/discharge date of the air valve, which is narrower than the pipe, the flow speed increases rapidly and collides with the head of the pipe.

In this case, the weight of a unit volume of water + 3 air ρ is approximately 820 times the weight of a unit volume, and the head is momentarily pushed by the extremely large force and force of the flow velocity, so the shaft connected to the head is also At the same time, pump up the float valve instantly.

When the float valve approaches the valve seat due to this force, the space between the upper part of the float valve and the valve seat becomes narrower, the air flow speed becomes faster, and the pressure decreases, so the float valve in the above state instantly approaches the valve seat. Close contact.

Therefore, when the water that has flowed into the air valve reaches the valve seat in the air valve, the air valve is blocked by the float valve, so the air is discharged from the air valve, but the water is not definitely discharged.

Therefore, various problems caused by drainage from the air valve can be reliably prevented.

Example 1 This will be explained based on FIG.

The above-mentioned pedestal 4 is seated on a pedestal 4 having a bottom 3 with a hole 2 that communicates between the inside and outside for drainage, and has a built-in float valve 6a that can move up and down. The valve box 1 is provided inside the valve box 1 so as to face an intake/exhaust port 8 formed in the lower part of the box 7 so as to communicate with the inside and outside. In the air valve, a valve cover 11 is provided with a valve seat 10 fitted with a rubber ring 5 on the lower surface of which the float valve 6a abuts to open and close the valve.
A shaft 13 is provided with a circular head 12 of an appropriate width at one end of the hole, and a compression spring 14 is inserted between the outside of the bottom 3 and the head 12. interposed, bottom 3
The cradle 4 is inserted from the outside so that it can move up and down, and inserted into the above hole.
The tip of the shaft that protrudes inward is the float valve 6a seated in the pedestal 4.
A metal fitting 15 is provided at an appropriate position of the shaft 13 around the inner hole of the bottom part 3 to prevent it from falling off.
The head 12 provided at the lower end of the air valve 1a0 is connected to the shaft 13 so as to protrude at least into the suction/discharge port 8 at an appropriate position. The air in the pipe is pushed by the flow rate of the installed water in the pipe and flows into the intake/discharge port 8 of the air valve 1a at a high speed. 12 collides first, but axis 1
3. The shaft 13 cannot be pushed up by the weight of the head 12 and the compression spring 14.

Therefore, the flow valve $a seated in the pedestal 4 does not move.

The water in the pipe that is discharging the air increases the flow velocity and flows into the narrow suction/discharge port 8, and the head 12 protrudes into the suction/discharge port 8.
collide first.

The speed of the water at the time of collision and the mass of water, which has a weight ratio of about 820 times that of air, instantaneously compresses the compression spring 14, and the tip of the shaft 13 is connected to the float valve 6a.
Instantly lifts up with great force.

When the lifted float valve 6a rises in the pedestal 4 and approaches the intake/exhaust port 9 provided on the valve seat 10, the gap between the intake/exhaust port 9 and the float valve 6a becomes narrower, and the more air is discharged. Since the flow rate increases and the pressure there simultaneously decreases, the float valve 6a instantly comes into contact with the valve seat 10 and the air valve 1a is closed.

The water that collides with the head 12 becomes a turbulent flow that passes through the narrow curved space between the valve box 7 and the pedestal 4, and the individual streams of water interfere with each other and flow into the following valve box 7. When the water rises and reaches near the valve seat 10, the float valve 6a contacts the valve seat 10 and is blocked, so the water that has flowed into the air valve 1a will not be discharged to the outside from the air valve 1a. .

Also, at that time, the water level in the valve box 7 has reached close to the valve seat 10, so the float valve 6a fits onto the valve seat 10 by its own buoyancy, and while water pressure is applied, the water in the air valve 1a leaks. There isn't.

If the speed at which air and water flow into the air valve is high, the float valve 6a can be raised more quickly by making the vertically movable shaft 13 longer and protruding the head 12 from the lower part of the suction/discharge port 8. Since the air valve 1a can be blocked, the air in the pipe can be discharged, and water drainage and water leakage can be reliably prevented when the air valve 1a is blocked, unlike conventional air valves. By doing so, secondary disasters can be completely prevented.

Also, instead of using a compression spring, the shaft 13, metal fitting 15, and head 12
The same effect can be obtained even if the weight is increased by appropriately increasing the weight.

Example 2 A pedestal 4 is installed with the bottom 3 provided with the drainage hole 2 facing the suction/discharge port 8 provided in the lower part of the valve box 7 and expanded upward, and inside the pedestal 4, the upper and lower parts are placed. A small valve hole 18 and a hole 21 communicating inside and outside are provided in the center of the hemispherical surface, a small valve seat 17 is provided around the inside of the small valve hole 18, and a window hole 19 is provided in the body between the upper and lower hemispherical shapes.
A float valve 6 has a semi-elliptic float valve seat 16 with a hemispherical surface on its upper and lower parts that can move up and down.
A float valve seat 16 with a built-in valve is seated so as to be movable up and down, and a circular intake/exhaust port 9 is formed in the upper part of the valve box 7. The float valve seat 16 abuts around the lower surface of the intake/exhaust port 9 to open and close it. In this air valve, a valve cover 11 is provided with a valve seat 10 formed with a rubber ring 5 that protects the valve, and a hole is provided in the bottom part 3 of the pedestal 4 to pass through it vertically, and a hole with an appropriately large outer diameter is provided in the hole so as to be vertically movable. A circular head 12 with an appropriately large diameter is provided at the end of the shaft 13 on the suction/discharge port 8 side, and the pedestal 4 is inserted.
The shaft 13 protruding inward is provided with a metal fitting 15 for preventing the shaft 13 from falling out of the hole and for adjusting the distance between the tip of the shaft 13 and the lower part of the float valve seat 16. The air valve 1b0 is configured to be determined by taking into consideration that the water is appropriately protruded within the suction/discharge date 8. These air valves 1b, etc. have the function of gradually discharging the air that has accumulated inside the air valve 1b, and when a large amount of air is discharged from the pipe through the air valve 1b by water supply, the air valve does not drain or drain to the outside. It is constructed to prevent water leakage.

As for the action and effect, a large amount of air is pushed inside the pipe at once, and the air passes through the air intake and discharge port 8 of the air valve 1b, and the air first flows into the head 1.
2. Although the shaft 13 collides with the bottom 3, it does not move because it is formed by its own weight that cannot be pushed up enough by the air collision, so the collided air passes through the narrow gap between the valve box I and the pedestal 4. The air then rises, passes through the intake/exhaust port 9, and is discharged.

When the water that has been pushed by the air from the casting enters the narrow suction/discharge port 18 from the pipe, the flow velocity increases further and first it collides with the head 12 and then the bottom 3.
It collides with the valve body 7 and becomes a violent turbulent flow, which rises inside the valve box 7.

At this time, when the water first hits the head 12 with force,
Unlike the case where the air hits the head 12 with a flow velocity,
Since the mass of water is approximately 820 times greater than the mass of air, its impulse is also significantly large, so the shaft 13 with the head 12, which did not move due to the collision of the air, is instantly pushed up. Therefore, the float valve seat 16 is scooped up by the shaft 13 earlier than the water rising inside the valve box 7 and comes into contact with the valve seat 10 to close it.

At the same time, the float valve 6b in the float valve seat 16 is also closed by contacting the small valve seat 17, so no water is discharged from the air valve 1b.

Immediately after the above state is reached, the water in the air valve 1b flows into the inside of the float valve seat 16 from outside the window 19, so the float valve 6b itself increases its buoyancy and continues to contact the small valve seat 17 with that force. Since the buoyancy of the float valve 6b keeps the float valve seat 16 in contact with the valve seat 10, no water leakage occurs from the air valve 1b.

This air valve 1a has the remarkable effect of reliably solving the direct and indirect problems of drainage and water leakage that occur when discharging large volumes of air with the various conventional air valves.

[Brief explanation of drawings]

FIG. 1 shows a longitudinal section of the initial rapid exhaust valve disclosed in Japanese Utility Model Application No. 11617/1983. FIG. 2 shows a cross section of a balance device for automatic air suction and discharge for water supply pipes, disclosed in Japanese Utility Model Application No. 48-91512. FIG. 3 shows a vertical section of a front portion of the air valve according to the first embodiment of the present invention. FIG. 4 shows a vertical section of a front portion of an air valve according to a second embodiment of the present invention. 1a...Air valve, 1b-.1.1 Air valve, 2.
・・・・One drainage hole, 3・・・・Bottom, 4・・・・One cradle, 5・・・・・Rubber ring, 6a, 6b・・・・・・Float valve, 7・・・・One bento box, 8...1, intake and exhaust day, 9.
・-・Single intake/exhaust port, 10...Valve seat, 11...
・・Valve lid, 12・・1 head, 13・・・・shaft,
14...1 compression spring, 15.1.1 metal fitting, 16...
-...-Float valve seat, 17.1...Small valve seat, 18
・-・One small valve hole, 19...Window hole, 2o...-
... Information board, 21... one hole.

Claims (1)

[Claims] 1. A float valve is seated in a pedestal that has a drainage hole that communicates with the inside and outside, and has a bottom that can be moved up and down, and the outside of the bottom of the pedestal leads to a connecting pipe provided at the bottom of the valve box. A valve lid is installed inside the valve box so as to face the intake/exhaust date, has an intake/exhaust port on the upper part of the valve box, and forms a valve seat around the lower surface of the intake/exhaust port on which the float valve contacts and opens/closes. In the air valve, a hole is provided at the bottom of the pedestal that passes through the top and bottom, and a shaft with a head is inserted into the hole from below so as to be movable up and down, and the end of the shaft is inserted into the float valve seated on the pedestal. An air valve characterized by having a retaining fitting installed on the shaft so that it can be kept in a close position.