JPH0765692B2 - Air valve - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air valve for exhausting air from a pipe or the like into the atmosphere, and in particular, a fluid such as sewage is not allowed to flow out to the outside. It is suitable for pipelines and the like.

2. Description of the Related Art A conventional air valve of this type has a float 2 and a floating valve 3 in a valve box 1 as shown in FIG. To be done. Valve box 1
Is formed by connecting a floating valve box 9 having an exhaust hole 8 at the top to a float chamber 7 having a fluid inlet 6 at the bottom. In the float chamber 7, a protective wall 10 for blocking the splash at the upper end is provided, and the float 2 is vertically movable. The protective wall 10 is provided with a plurality of air holes 11. The float 2 has a guide rod 12 extending upward from the center.
The float valve element 14 is connected to the tip end portion of the guide rod 12 via a connecting fitting 13. The float valve body 14 has an air hole 15 at the center and is arranged in the floating valve box 9 so as to be able to move up and down. The floating valve 3 is for opening and closing the exhaust hole 8 by moving the float valve body 14 up and down, has a small exhaust hole 16 in the center, and can be moved up and down at a position corresponding to the exhaust hole 8. The ball valve 4 is always open and is closed during maintenance, inspection, replacement, etc. of the air valve.

In the above air valve, when the pipe line 5 is filled with water, the pipe line 5
The air inside flows into the float chamber 7 from the fluid inflow hole 6 via the ball valve 4, rises in the float chamber 7 and flows into the floating valve box 9 from the air hole 15 of the float valve body 14. A large amount is exhausted into the atmosphere from the exhaust hole 8. When water as a fluid flows into the float chamber 7 (liquid level 1) after the exhaust is almost finished, the float 2 floats, and the guide rod 12 and the connecting metal fitting are connected.
The float valve body 14 is pushed up via 13. The idle valve 3 is
It is lifted by the float valve body 14 and the exhaust hole 8 is closed. Even after the exhaust hole 8 is closed, the air in the float chamber 7 is compressed by the pressure in the conduit 5 and the liquid level rises. Next, when the air in the conduit 5 flows into the float chamber 7, the liquid level is lowered (liquid level m), and the float 2 is lowered together with the float valve body 14. However, the floating valve 3 does not descend because the pressure in the pipeline 5 acts on the lower surface thereof, and the exhaust hole 8 remains closed. Therefore, the float valve element 14 separates from the floating valve 3 and opens the small exhaust hole 16, and a small amount of air in the floating valve box 9 is exhausted from the small exhaust hole 16 to the atmosphere via the exhaust hole 8. As the liquid level rises with this, float 2
Floats and pushes up the float valve body 14 and closes the small exhaust hole 16.

However, in the conventional air valve described above, as described above, the float chamber 7 is made sufficiently high, and the air in the float chamber 7 is compressed as the pipe internal pressure increases. Is dealing with. Therefore, the float chamber 7 becomes large. Further, when the pressure in the floating valve box 9 is low, the effect that the pressure acts on the lower surface of the floating valve 3 to press the floating valve 3 against the exhaust hole 8 cannot be expected, so that the sealing property of the exhaust hole 8 is The buoyancy of the float 2 is exclusively used, and the float 2 becomes large. Thus, it is difficult to make the air valve compact, and it is not easy to install the air valve in the manhole.

It is an object of the present invention to improve the conventional air valve and eliminate such problems.

Means for Solving the Problems In order to achieve the above object, the air valve of the present invention comprises a float and a floating valve having a valve element in the lower part of the valve rod in the valve box, and the valve box is A float valve box having a fluid inflow hole at the bottom is sequentially provided with a floating valve box, an exhaust chamber having an exhaust hole communicating with the atmosphere, and a pressure chamber divided into an upper chamber and a lower chamber by a vertically movable diaphragm. The float is arranged to be able to move up and down in the float chamber, and the valve body that can open and close the exhaust hole is arranged to be able to move up and down in the floating valve box. The buoyant force acting on the float causes the valve body to close the exhaust hole upward. Thus, the lower end of the valve rod is connected to the float via a guide rod so that it can move up and down by a certain amount with respect to the upper portion of the float.
The upper end of the valve rod extends upward and is connected to the diaphragm, and a communication hole that communicates between the inside of the floating valve box and the upper chamber is provided through the center of the valve rod. It is formed larger than the opening area, the upper chamber communicates with the atmosphere through a small exhaust hole with a diameter smaller than the communication hole, and an elastic body that biases the valve rod in the direction of closing the exhaust hole with the valve body is attached to the pressure chamber. The upper end portion of the float is configured so that the lower end opening of the communication hole is closed by the buoyancy acting on the float.

Action In the configuration of the present invention described above, initially, the valve body of the floating valve closes the exhaust hole by the action of the elastic body, and the float opens the communication hole apart from the valve rod of the floating valve. When the pipe line starts to be filled with water, the air in the pipe line flows into the float chamber from the fluid inflow hole, and part of the air flows into the upper chamber of the pressure chamber via the communication hole. The air that flows into the upper chamber acts on the diaphragm, and the pressure receiving area of the diaphragm is formed larger than the opening area of the exhaust hole, so it is pushed up by the air pressure in the pipeline acting on the lower surface of the valve body. The valve stem is pushed down against the force and the repulsive force of the elastic body. Therefore, the valve body opens the exhaust hole, and a large amount of air in the float chamber is exhausted into the atmosphere through the exhaust hole. When the exhaust gas is almost finished and water as a fluid flows into the float chamber, the float floats and abuts on the valve rod to close the communication hole. Then,
Due to the action of the small exhaust holes, the internal pressure of the upper chamber becomes atmospheric pressure,
Air does not flow into the upper chamber, the pushing force of the valve rod acting on the diaphragm is lost, and the valve body rises due to the buoyant force of the float and the restoring force of the elastic body to close the exhaust hole. Thus, the sealing property of the exhaust hole is maintained by both the buoyancy of the float and the restoring force of the elastic body. Therefore, good sealability can be obtained even with a small float.

Next, when the air in the conduit flows into the float chamber, the liquid level goes down and the float goes down. However, the idle valve
It does not descend due to the air pressure acting on the lower surface of the valve body and the restoring force of the elastic body. Therefore, the float separates from the valve rod and opens the communication hole, and the pressure in the floating valve box is transmitted to the upper chamber and acts on the diaphragm. Based on the fact that the pressure receiving area of the diaphragm is larger than the opening area of the exhaust hole, the downward force that overcomes the push-up force that acts on the lower surface of the valve body and the repulsive force of the elastic body occurs, and The rod is pushed down and the valve body opens the exhaust hole. Therefore, the air in the tube is initially in a contracted state, and the rise in the water level after stopping the water can be reduced. Therefore, unlike the conventional air valve, it is not necessary to raise the float chamber to be large.

When the exhaust hole is opened and the air in the floating valve box is discharged into the atmosphere, the pressure in the float chamber is reduced and the water level rises accordingly. Then, the float rises to come into contact with the valve rod and close the communication hole. Then, due to the action of the small exhaust holes, the internal pressure of the upper chamber becomes atmospheric pressure, the air does not flow into the upper chamber, the valve rod pushing down force acting on the diaphragm disappears, and the valve body floats on the float and elastic body. Rises due to the restoring force of and closes the exhaust hole.

As described above, according to the configuration of the present invention, since the elastic body that biases the valve rod of the valve body that closes the exhaust hole upward by the action of the float is provided in the direction that closes the exhaust hole, that is, the buoyancy and elasticity of the float are provided. Since the valve body closes the exhaust hole by both the urging force of the body, it is not necessary to make the float and the float chamber large, and therefore the entire air valve can be made compact.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the air valve of this embodiment is provided with a float 22 and a floating valve 23 in a valve box 21, and although not shown in the drawing, it is connected to a conduit via a ball valve. Erected.

The valve box 21 is arranged on the float chamber 24 in sequence, the floating valve box 25, and the exhaust chamber.
26 and a pressure chamber 27. The float chamber 24 has a fluid inflow hole 28 at the bottom, and a plurality of strainers 30 are provided on the upper surface of a protective wall 29 fixedly provided at the upper end. The fluid inflow hole 28 communicates with the inside of the conduit via a ball valve. Protective wall
29 is for blocking the splashes scattered from the liquid surface of the fluid, and has a plurality of air holes 31. Strainer 30
A disc with a large number of small holes that collects the dust scattered with the splash. The floating valve box 25 has an air hole 32 in the center and is fixedly installed on the float chamber 24 by a bolt 33. The exhaust chamber 26 has an exhaust hole 34 at the bottom and is fixedly mounted on the floating valve box 25 by bolts 35. The exhaust hole 34 communicates with the atmosphere through the opening 36 in the side wall. The pressure chamber 27 is composed of an upper chamber 38 and a lower chamber 39 which are closed by a diaphragm 37 at the bottom, and is fixed on the exhaust chamber 26 by bolts 40 and nuts 41. 42 is a plug screwed to the upper chamber 38, which is a small exhaust hole.
With 43.

The float 22 has an elliptic spherical shape and is made of a material having a specific gravity of less than 1, and has a guide rod 44 extending upward from the central portion,
The float chamber 24 is arranged so that it can be raised and lowered. Guide rod 44
Has an upper end portion penetrating the central portion of the protective wall 29 so as to be able to move up and down and projecting into the floating valve box 25, and has a long hole 45 at the tip portion.

The floating valve 23 has a valve body 46 formed below a valve rod 47.
The valve body 46 is a circular plate valve and is arranged so as to be able to move up and down in the air hole 32 of the floating valve box 25 so as to open and close the exhaust hole 34. Valve rod
The lower end portion of 47 is connected to the elongated hole 45 of the guide rod 44 via a pin 48 so as to be vertically movable with respect to the float 22. The upper end of the valve rod 47 extends upward and projects into the pressure chamber 27, and holds the diaphragm 37 between the upper and lower two washers 50, 51 fitted by the nut 49 to the tip. Valve rod 47
A communication hole 52 penetrates through the central part of the, and communicates the inside of the floating valve box 25 and the inside of the pressure chamber 27. A rubber valve seat 53 is fitted into the lower end opening of the communication hole 52. Small exhaust hole of the plug 42
The hole diameter of 43 needs to be formed smaller than that of the communication hole 52. Lower washer 51 of diaphragm 37 and pressure chamber 27
An elastic body 54 made of a compression spring is provided between the lower chamber 39 and the lower chamber 39, and biases the valve rod 47 upward. As shown in FIG. 2, the pressure receiving area of the diaphragm 37 is formed larger than the opening area of the exhaust hole 34.

In addition, the ball valve is always open,
It is closed for inspection and replacement.

Next, the operation of the above configuration will be described.

Initially, the valve body 46 of the floating valve 23 is exhausted by the action of the elastic body 54.
34 is closed, and the guide rod 44 of the float 22 is a floating valve.
The communication hole 52 is opened apart from the valve rod 47 of 23. When the pipe line starts to be filled with water, the air in the pipe line flows through the ball valve from the fluid inflow hole 28 into the float chamber 24, and a part of the communication hole is formed.
It flows into the upper chamber 38 of the pressure chamber 27 via 52. Upper chamber
The air that has flowed into 38 is partially exhausted to the atmosphere from the small exhaust hole 43, but since the small exhaust hole 43 is formed to have a smaller diameter than the communication hole 52, the rest acts on the diaphragm 37, Disc
The valve rod 47 is pushed down against the pushing force by the internal pressure in the float chamber 24 acting on the lower surface of the valve 46 and the repulsive force of the elastic body 54. Therefore, the valve body 46 opens the exhaust hole 34, and a large amount of air in the pipeline is exhausted to the atmosphere from the opening 36 via the exhaust hole 34.

When the exhaust gas is almost finished and water as a fluid flows into the float chamber 24, the float 22 floats up and the guide rod 44 moves to the valve rod.
The valve seat 53 of 47 is contacted, and the communication hole 52 is closed. Therefore, air does not flow into the upper chamber 38, the internal pressure becomes atmospheric pressure, the pushing down force of the valve rod 47 acting on the diaphragm 37 disappears, and the valve body 46 becomes buoyant force of the float 22 and the elastic body 54. And the exhaust hole 34 is closed by the restoring force of the. in this way,
Since the sealability of the exhaust hole 34 is maintained by both the buoyant force of the float 22 and the restoring force of the elastic body 54, it is not necessary to make the float 22 large like a conventional air valve. Even after the exhaust hole 34 is closed, the air in the float chamber 24 is compressed by the pressure in the pipe line and the liquid level rises (the liquid level L in FIG. 1).

Next, when the air in the pipeline flows into the float chamber 24,
The liquid level goes down, and the float 22 goes down. But the idle valve
23 does not descend due to the pressure in the floating valve box 25 acting on the lower surface of the valve body 46 and the restoring force of the elastic body 54. Therefore, the guide rod
The valve 44 separates from the valve rod 47 and opens the communication hole 52, and the air in the floating valve box 25 flows into the upper chamber 38. Part of the air in the upper chamber 38 is exhausted to the atmosphere through the small air holes 43, but the small exhaust holes 43
Has a smaller diameter than the communication hole 52, the rest is the diaphragm
Acts on 37. Further, the pressure-receiving area of the diaphragm 37 is formed larger than the opening area of the exhaust hole 34. The valve rod 47 is pushed down and the valve element 46 opens the exhaust hole 34 only after the occurrence of.
Therefore, the air in the tube is in the first contracted state,
The rise in water level after the water stop can be reduced.

When the exhaust hole 34 is opened and the air in the floating valve box 25 is discharged into the atmosphere, the pressure in the float chamber 24 is reduced accordingly, and the liquid level rises. Then, the float 22 floats, the guide rod 44 contacts the valve rod 47, and the communication hole 52 is closed. Therefore, the air does not flow into the upper chamber 38 and the inside of the upper chamber 38 becomes atmospheric pressure, the pushing down force of the valve rod 47 acting on the diaphragm 37 disappears, and the valve body 46 is buoyant and elastic of the float 22. It rises due to the restoring force of the body 54 and closes the exhaust hole 34.

As described above, in the air valve of this embodiment, the float
Since it is not necessary to make the size of 22 and the float chamber 24 large, the entire air valve can be made compact.

EFFECTS OF THE INVENTION As described above, the present invention has a configuration in which an elastic body that biases the valve rod of the valve body that closes the exhaust hole upward by the action of the float is attached to the pressure chamber. Therefore, the air in the float chamber is initially in a compressed state, and the liquid level rise in the float chamber due to the compression of the air in the float chamber after exhausting a large amount of air and closing the exhaust holes can be suppressed. Therefore, it is not necessary to make the float chamber large. Further, since the valve body of the floating valve closes the exhaust hole by the buoyancy of the float and the restoring force of the elastic body, it is not necessary to make the float large. Therefore, there is an advantage that the entire air valve becomes compact.

[Brief description of drawings]

FIG. 1 is a sectional view of an air valve showing an embodiment of the present invention, and FIG.
FIG. 3 is an enlarged sectional view showing a main part of the present invention, and FIG. 3 is a sectional view showing an example of a conventional air valve. 21 ... Valve box, 22 ... Float, 23 ... Floating valve, 24 ... Float chamber, 25 ... Floating valve box, 26 ... Exhaust chamber, 27 ... Pressure chamber, 28 ... Fluid inflow hole, 34 ... Exhaust hole, 37 ... Diaphragm, 46 ... Valve, 47
… Valve rod, 52… Communication hole, 54… Elastic body.

Claims (1)

[Claims] 1. A float and a floating valve having a valve element at a lower portion of a valve rod are provided in a valve box, and the valve box is provided with a floating valve box on a float chamber having a fluid inflow hole at its bottom. An exhaust chamber having an exhaust hole communicating with the atmosphere, and a pressure chamber divided into an upper chamber and a lower chamber by a diaphragm that can be moved up and down, and the float is arranged in the float chamber so as to be able to move up and down. A valve element that can open and close is placed in the floating valve box so that it can be moved up and down, and the buoyant force acting on the float causes the valve element to close the exhaust hole upward, so that the lower end of the valve rod is above the float by a certain amount. It is connected to the float via a guide rod so that it can move up and down only, the upper end of the valve rod extends upward and is connected to the diaphragm, and a communication hole that connects the inside of the floating valve box and the upper chamber is formed in the center of the valve rod. The pressure receiving area of the diaphragm is The upper chamber is formed larger than the opening area of the pores, and the upper chamber communicates with the atmosphere through a small exhaust hole with a diameter smaller than the communication hole. An air valve attached, wherein the upper end portion of the float is configured to close the lower end opening of the communication hole by buoyancy acting on the float.