JPH07151255A - Air valve for sewage - Google Patents

Abstract

PURPOSE:To prevent the flow-out of sewage in the case when a valve is closed and accelerate the closing operation of a valve member, by fixing a buffer plate which can close a vent hole by the horizontal spreading under a splash removing part, on a float shaft. CONSTITUTION:If the water level in a valve casing 1 rises, in a closed state, accompanied with the air discharge, a float shaft 13 is raised, and a float shaft 13a closes a small air hole, and the air supply to a pressure chamber 9a is suspended, and the pushingdown force by a diaphragm 9 becomes zero, and the pushing force of a spring and the buoyancy of the float 13 push down a valve element 5, and closes a large air hole 2. At this time, a buffer plate 21 fixed on the float shaft 13a receives the water which flows into the valve casing 1, and suppresses the upward energy of the water, and the outside flow-out of water before the valve element 5 is perfectly closed is prevented. Further, the buffer plate 21 is raised by being applied with the energizing force of the water, and the valve body 5 is speedily closed, together with the buoyancy of the float 13, and the buffer plate 21 closes the vent hole 16 in a splash removing part 14, and the flow-out of the water is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage air valve used in a sewage pipeline or the like.

[0002]

2. Description of the Related Art Conventionally, a sewage air valve arranged in a sewer pipe or the like has a structure as shown in FIGS. 3 to 4, for example. In FIGS. 3 to 4, the valve box 1 communicates with a pipeline to be attached at the bottom, and an air hole cover 3 that forms a large air hole 2 for discharging air is provided at the top of the valve box 1. The hole cover 3 communicates with the exhaust port 4.

A valve body 5 for opening and closing the large air hole 2 is arranged inside the valve box 1, and a shaft portion 6 of the valve body 5 is attached to an air hole cover 3
It is supported by the diaphragm 7 arranged on the upper part of the. The diaphragm 7 is provided by being sandwiched between a pressure box cover 9 and a spring box 8 provided on the upper portion of the air hole cover 3. Inside the spring box 8, a spring 10 for urging the diaphragm 7 upward is arranged, and the pressure chamber cover 9
Forms a pressure chamber 9a with the diaphragm 7.
The pressure chamber cover 9 is provided with a small exhaust port 9b. Disc 5
The small air holes 11 are formed in the lower part of the
Is a pressure chamber 9 through a through hole 12 provided in the shaft portion 6 of the valve body 5.
It communicates with a.

The float 13 arranged inside the valve box 1 has a float shaft 13a, and the float shaft 13a penetrates a splash eliminator 14 arranged in the upper space of the valve box 1. The float shaft 13a has a long hole 13b at the upper end, and the long hole 13b
The float shaft 13a is attached to the valve body 5 via the pin 15 inserted in the
Is connected to the bottom of. Therefore, with respect to the valve body 5, the float 13 moves up and down within the range allowed by the long hole 13b, and closes the small air hole 11 at the upper point. The splash-proof portion 14 has a vent hole 16, and a strainer 17 is arranged in the vent hole 16.

According to this structure, in the closed state, the valve body 5 closes the large air hole 2 and the float shaft 13a closes the small air hole 11. In this closed state, when air accumulates in the internal space of the valve box 1 and the water level in the valve box 1 drops, the internal pressure of the valve box 1 causes the valve body 5 to close the large air hole 2 and the water level drops. Along with this, the float 13 descends within the range allowed in the long hole 13b, and the small air hole 11 is opened.

[0006] In this state, the air in the valve box 1 is small air hole 1
1 to the pressure chamber 9a through the through hole 12 and then to the outside through the small exhaust port 9b. On the other hand, the difference between the inflow amount and the outflow amount of air in the pressure chamber 9a acts on the diaphragm 7 as a residual pressure, and this force pushes down the valve body 5 via the shaft portion 6 to open the large air hole 2.

In the open state in which the large air hole 2 is opened,
A large amount of air in the valve box 1 is strainer 1 of the splash eliminator 14.
7 through the large air hole 2 into the air hole cover 13,
It is exhausted to the outside through the exhaust port 4.

When the water level in the valve box 1 rises as air is exhausted, the float 13 rises due to buoyancy, and the float shaft 13a closes the small air hole 11. When the small air hole 11 is closed, the supply of air to the pressure chamber 9a is stopped, the pressing force of the diaphragm 9 is lost, and the pressing force of the spring 10 and the buoyant force of the float 13 push up the valve body 5 and the valve body 5
Returns to the closed state in which the large air hole 2 is closed.

[0009]

However, in the above-mentioned conventional structure, when the valve body 5 is pushed up by the rise of the float 13 at the time of closing, the gas-liquid mixed fluid in which air and water are mixed in the valve box 1 is used. When the air flows in, due to the fact that the float 13 does not exert sufficient buoyancy or the float 13 does not sufficiently follow the rise of the water level, the large air hole 2 is not completely blocked by the valve body 5, and There was a problem that sewage flowed out from No. 2.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a sewage air valve capable of preventing the outflow of sewage at the time of closing and promoting the closing operation of the valve body.

[0011]

In order to solve the above-mentioned problems, the sewage air valve of the present invention has a valve box which communicates with a pipe at a lower portion and has a large air hole at an upper portion, and has an inner space which is vertically moved. A partition is placed on the splash barrier, and a float is installed at the lower end of the float shaft that penetrates the splash shield up and down, and a valve is installed at the upper end of the float shaft that opens and closes a large air hole as the float moves up and down. , In the air valve that has a vent hole that connects the upper and lower spaces in the valve box to the splash eliminator, a cushion plate that horizontally expands and can close the vent hole is fixed to the float shaft below the splash eliminator. It has a configuration provided by.

[0012]

With the above structure, when the valve body closes the large air hole, the water level in the valve box lowers as air flows into the valve box from the piping, and the float drops due to the lowering of the water level. Then, the valve body is pulled down to open the large air hole. In this open state, the air in the valve box flows out through the large air holes from the ventilation holes in the splash eliminator, the water flows into the valve box, and the float rises as the water level rises. Push up to close large air holes.

At this time, the buffer plate fixed to the float shaft receives the water flowing into the valve box, suppresses the upward force of the water, and the water flows out to the outside before the valve body completely closes. Prevent that. In addition, the buffer plate that receives water rises due to the upward urging force of water, and urges the valve element in the closing direction via the float shaft, so that the valve element not only floats on the float but also inside the valve box. The urging force of the water flowing into the water causes the water to quickly close, and the buffer plate closes the vent hole of the splash proof part to prevent the water from flowing out.

Therefore, since the water flowing into the valve box is a gas-liquid mixed flow accompanied by air, even if the float cannot obtain sufficient buoyancy, the buffer plate suppresses the momentum of water.
It is possible to prevent the outflow of water to the outside by promptly closing the valve element and the buffer plate by the urging force of water.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The configurations shown in FIGS. 1 and 2 are basically the same as the configurations described above with reference to FIGS. 3 to 4, and therefore members having the same functions are denoted by the same reference numerals and description thereof will be omitted.

1 and 2, the float 13 arranged inside the valve box 1 has a float shaft 13a, and the float shaft 13a is arranged in the upper space of the valve box 1 to prevent splashes 14.
Penetrates through. The splash proof part 14 has a vent hole 16 that communicates the upper and lower spaces of the valve box 1, and a strainer 17 is arranged in the vent hole 16.

Below the splash eliminator 14, a horizontally expanding buffer plate 21 is fixed to the float shaft 13a, and the buffer plate 21 moves up and down together with the float shaft 13a.
The vent hole 16 is closed at the upper point. The outer peripheral edge of the buffer plate 21 and the inner peripheral surface of the valve box 1 are close to each other. Also,
The buffer plate 21 may be a rigid body or an elastic body, and may have a large number of small holes.

The operation of the above configuration will be described below.
In the closed state, the valve body 5 closes the large air hole 2 and the float shaft 13a closes the small air hole 11. In this closed state, when the air flowing in from the piping accumulates in the internal space of the valve box 1 and the water level in the valve box 1 drops, the valve body 5 closes the large air hole 2 under the internal pressure of the valve box 1. Then, as the water level decreases, the float 13 descends within the range allowed in the long hole 13b, and the small air hole 11 is opened.

In this state, the air in the valve box 1 is small air hole 1
1 to the pressure chamber 9a through the through hole 12 and then to the outside through the small exhaust port 9b. On the other hand, the difference between the inflow amount and the outflow amount of air in the pressure chamber 9a acts on the diaphragm 7 as a residual pressure, and this force pushes down the valve body 5 via the shaft portion 6 to open the large air hole 2.

In the open state with the large air holes 2 open,
A large amount of air in the valve box 1 is strainer 1 of the splash eliminator 14.
7 through the large air hole 2 into the air hole cover 13,
It is exhausted to the outside through the exhaust port 4.

When the water level in the valve box 1 rises as air is exhausted, the float 13 rises due to buoyancy, and the float shaft 13a closes the small air hole 11. When the small air hole 11 is closed, the supply of air to the pressure chamber 9a is stopped, the pressing force of the diaphragm 9 is lost, and the pressing force of the spring 10 and the buoyant force of the float 13 push up the valve body 5 and the valve body 5
Returns to the closed state in which the large air hole 2 is closed.

At this time, the buffer plate 21 fixed to the float shaft 13a receives the water flowing into the valve box 1 and suppresses the upward force of the water, so that the water is drained before the valve body 5 is completely closed. Prevent outflow to the outside. Further, the buffer plate 21 that receives water rises in response to the upward biasing force of the water and biases the valve body 5 in the closing direction via the float shaft 13a, so that the valve body 5 only has the buoyancy of the float 13. Instead, the urging force of the water flowing into the valve box 1 is received to quickly close the valve box 1, and the buffer plate 21 closes the ventilation hole 16 of the splash proof part 14 to prevent the water from flowing out.

Therefore, even if the water flowing into the valve box 1 at the time of closing the valve body 5 is a gas-liquid mixed flow accompanied by air, the outflow of water to the outside is not affected by the property of the water. It can be prevented.

[0024]

As described above, according to the present invention, even when the float cannot obtain sufficient buoyancy, the water flowing into the valve box is a gas-liquid mixed flow accompanied by air. It is possible to prevent the outflow of water to the outside by suppressing the momentum of water by the buffer plate and promptly closing the valve element and the buffer plate by the urging force of water.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a sewage air valve showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a main part of the embodiment.

FIG. 3 is a cross-sectional view of a conventional sewage air valve.

FIG. 4 is an enlarged cross-sectional view showing a main part of the sewage air valve.

[Explanation of symbols]

 1 Valve Box 2 Large Air Hole 5 Valve Body 13 Float 13a Float Shaft 14 Splash Avoidance Section 16 Vent Hole 21 Buffer Plate

Claims (1)

[Claims] 1. A float shaft, which has a splash box for partitioning an internal space into upper and lower parts, which is connected to a pipe in a lower part and has a large air hole in an upper part, and which penetrates the splash screen in a vertical direction. An air valve with a float at the lower end, a valve body at the upper end of the float shaft that opens and closes a large air hole as the float moves up and down, and a ventilation hole that connects the upper and lower spaces in the valve box to the splash eliminator. At, below the splash guard,
An air valve for sewage, characterized in that a buffer plate which is horizontally spread and can close the vent hole is fixedly provided on the float shaft.