JPH0765691B2 - 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 in a pipeline or the like into the atmosphere.

2. Description of the Related Art A conventional air valve of this type has a guide cylinder 2, a float 3 and a floating valve 4 inside a valve box 1 as shown in FIG. Set up. Standing box 1
Has a fluid inflow hole 5 communicating with the pipeline at the bottom and an exhaust hole 6 communicating with the atmosphere at the top. Guide tube 2
Has a lower opening 7 at the bottom and an upper opening 8 at the upper end of the side wall, and the upper end is fixed to the upper end of the valve box 1. The float 3 is arranged in the guide tube 2 so as to be movable up and down. The floating valve 4 has a small exhaust hole 9 in the center and is mounted on the float 3.

Then, normally, the float 3 and the floating valve 4 are lowered as shown in the drawing. When the pipe line is filled with water, the air in the pipe line flows into the valve box 1 from the fluid inflow hole 5 and is exhausted into the atmosphere from the exhaust hole 6 through the upper opening 8 of the guide cylinder 2 to the atmosphere.
When water as a fluid flows into the valve box 1 after the exhaust is almost finished, the water flows into the guide cylinder 2 through the lower opening 7 and the upper opening 8, and the float 3 floats to move the floating valve 4 to the floating valve 4. Push up. The idle valve 4 closes the exhaust hole 6. At this time, the small exhaust hole 9 remains closed by the float 3. Next, when the air in the pipe line accumulates in the valve box 1, the liquid level is lowered and the float 3 is lowered. However, the idle valve 3
The inner pressure of the pipe line acts on the lower surface of the pipe and does not descend, and the exhaust hole 6 remains closed. Therefore, the float 3 separates from the floating valve 4 and opens the small exhaust hole 9, and a small amount of air in the valve box 1 is exhausted to the atmosphere through the small exhaust hole 9. When the liquid level in the valve box 1 rises accordingly, the float 3 floats and the small exhaust holes 9
Close.

However, in the above conventional air valve, when exhausting sequentially under pressure as described above, the exhaust is from the small exhaust hole 9, so that the air is discharged from the inside of the pipe to the inside of the valve box 1. There was a problem that even if a large amount of air came in, it could not be exhausted in a short time. In particular, when the pipe line is filled with water and nears full water, a wave is generated on the liquid level in the pipe line, the liquid level in the valve box 1 temporarily becomes higher than the float 3, and the exhaust hole 6 becomes Closed, then
Since only the air is exhausted from the small exhaust holes 9, there is a problem that the filling time becomes long. Further, when the air in the pipeline is exhausted from the exhaust hole 6 at a high speed, a so-called sucking phenomenon may occur in which the floating valve 4 is sucked up by the air flow and the exhaust hole 6 is closed. 6
When the valve is closed, the floating valve 4 does not descend while the pipe line is under pressure, and even if a large amount of air remains in the pipe line, the air is exhausted only through the small exhaust hole 9. there were.

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, an air valve of the present invention comprises a float having a guide rod extending upward and a floating valve having a valve element at a lower portion of the valve rod in a valve box. The valve box was divided into a floating chamber having a fluid inflow hole at the bottom, an idle valve box, an exhaust chamber having an exhaust hole communicating with the atmosphere, and an upper chamber and a lower chamber by a diaphragm. The float is arranged to be able to move up and down in the float chamber, the valve body which can open and close the exhaust hole from the lower side is arranged to be able to move up and down in the floating valve box, and the upper end of the valve rod is moved upward. A communication hole that extends and is connected to the diaphragm and that communicates between the inside of the floating valve box and the upper chamber is provided through the center of the valve rod, and the upper end of the guide rod is vertically movable by a certain amount. The guide rod is connected to the lower end and moves up and down when the float moves up and down. The opening of the lower end of the communication hole can be opened and closed at the upper end of the guide rod, the pressure receiving area of the diaphragm is formed larger than the opening area of the exhaust hole, and the upper chamber has a small exhaust hole with a diameter smaller than the communication hole. It is configured to communicate with.

Action In the configuration of the present invention described above, the float and the idle valve are initially lowered by their own weights, and the exhaust hole and the communication hole are opened. When the pipe line is filled with water, the air in the pipe line flows into the float chamber through the fluid inflow hole and is exhausted into the atmosphere through the exhaust hole. At that time, the internal pressure in the upper chamber of the pressure chamber is balanced with the internal pressure in the floating valve box via the communication hole. When the exhaust is almost finished and the fluid flows into the float chamber, the float floats and abuts the valve rod of the floating valve, closes the communication hole and lifts the floating valve, and the valve body closes the exhaust hole. Even after the exhaust hole is closed, the air in the float chamber is compressed by the pressure in the pipe line to raise the liquid level, and the air pressure acts on the lower surface of the valve body as a pushing force. next,
When the air in the pipe flows into the float chamber, the liquid level goes down and the float goes down. However, the floating valve does not descend because the air pressure acts on the lower surface of the valve 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. The pressure in the upper chamber acts as a pressing force on the valve rod upper end through the diaphragm, and since the pressure receiving area of the diaphragm is larger than the opening area of the exhaust hole, this pressing force acts on the lower surface of the valve body. Overcome pushing force, etc. Therefore, the floating valve descends to open the exhaust hole, and the air in the floating valve box is exhausted to the atmosphere through the exhaust hole. At this time, in addition to the pushing-down force acting on the diaphragm, the weight of the floating valve closing the exhaust hole from the lower side, and the weight of the guide rod and the float connected to the lower end of the valve rod of the floating valve, Since the floating valve is moved in the opening direction, the exhaust hole is easily opened. Exhaust under this pressure is performed through the same exhaust holes as in the case of the large amount exhaust, so that large amount exhaust is possible. When the pressure in the float chamber and the upper chamber decreases due to this exhaust, and the liquid level rises, the float floats and contacts the valve rod, closing the communication hole. Then, due to the action of the small exhaust holes, the internal pressure of the upper chamber becomes atmospheric pressure, and the pressing force of the valve rod acting on the diaphragm decreases, and the float lifts the floating valve against this pressing force, The body closes the vent.

As described above, according to the configuration of the present invention, even a large amount of exhaust under pressure can be performed, and therefore, the filling operation can be performed in a short time. Further, since the internal pressure in the upper chamber acts on the valve rod as a pushing-down force, there is no possibility that the conventional sticking phenomenon will occur. Further, the pushing-down force acting on the diaphragm, the weight of the floating valve, and the weight of the guide rod and the float tend to move the floating valve in the opening direction, so that the exhaust hole can be easily opened. Moreover, since the exhaust hole and the valve body are installed in the upper part of the float through the guide rod, the fluid in the float chamber does not reach the level of the exhaust hole and the valve body.
Therefore, there is no possibility that filth in the fluid will adhere to these exhaust holes and valve body.

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 the present embodiment comprises a float 12 and a floating valve 13 in a valve box 11, and although not shown in the drawing, it is connected to a conduit via a ball valve. Erected.

The valve box 11 is mounted on the float chamber 14 in sequence, the floating valve box 15 and the exhaust chamber.
16 and pressure chamber 17 are provided. The float chamber 14 has a fluid inflow hole 18 at the bottom, and a plurality of strainers 20 are provided on the upper surface of a protective wall 19 fixed to the upper end. The fluid inflow hole 18 communicates with the inside of the conduit via a ball valve. The protective wall 19 is for blocking the splashes scattered from the liquid surface of the fluid, and has a plurality of air holes 21. The strainer 20 is a disc having a large number of small holes, and collects the dust scattered with the splash. The floating valve box 15 has an air hole 22 in the center thereof and is fixedly installed on the float chamber 14 by a bolt 23. The exhaust chamber 16 has an exhaust hole 24 at the bottom and is fixedly mounted on the floating valve box 15 by bolts 25. The exhaust hole 24 communicates with the atmosphere through an opening 26 in the side wall. The pressure chamber 17 includes an upper chamber 28 and a lower chamber whose bottom is sealed by a diaphragm 27.
29, and is fixed on the exhaust chamber 16 by bolts 30 and nuts 31. 32 is a plug screwed to the upper chamber 28,
It has a small exhaust hole 33.

The float 12 has an elliptical spherical shape and is made of a material having a specific gravity of less than 1, and has a guide rod 34 extending upward from the central portion,
The float chamber 14 is arranged so as to be able to move up and down. Guide bar 34
Has an upper end that penetrates the center of the protective wall 19 so as to be able to move up and down and projects into the floating valve box 15, and has a long hole 35 at the tip.

The floating valve 13 has a valve body 36 formed below a valve rod 37.
The valve body 36 is a circular plate valve, and is arranged so as to be able to move up and down in the air hole 22 of the floating valve box 15 so as to open and close the exhaust hole 24 from below. The lower end of the valve rod 37 is connected to the elongated hole 35 of the guide rod 34 via a pin 38 so as to be vertically movable with respect to the float 12. The upper end of the valve rod 37 extends upward to extend the pressure chamber 17
Top and bottom 2 protruding inside and fitted with a nut 39 at the tip
The diaphragm 27 is held between the washers 40 and 41.
A communication hole 42 penetrates through the central portion of the valve rod 37 to communicate the inside of the floating valve box 15 and the inside of the pressure chamber 17. A rubber valve seat 43 is fitted into the lower end opening of the communication hole 42. The small exhaust hole 33 of the plug 32 needs to have a smaller diameter than the communication hole 42.

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 float 12 and the floating valve 13 descend by their own weights, the guide rod 34 separates from the valve rod 37 and opens the communication hole 42, and the valve element 36 opens the exhaust hole 24. When the pipe is filled with water, the air in the pipe passes through the ball valve and enters the fluid inlet hole.
A large amount of gas flows into the float chamber 14 from 18 and is exhausted to the atmosphere from the opening 26 via the exhaust hole 24. At that time, the float room
Part of the air in 14 flows into the upper chamber 28 via the communication hole 42. Part of the air that has flowed into the upper chamber 28 is a small exhaust hole.
Although exhausted from the air 33 into the atmosphere, the small exhaust hole 33 is formed with a diameter smaller than that of the communication hole 42.Therefore, during the exhaust from the exhaust hole 24, the pressure of the air in the upper chamber 28 passes through the communication hole 42. Balances the pressure in the floating valve box 15 and allows the valve rod 37 to pass through the diaphragm 27.
Acts as a pressing force on. When the air is almost exhausted and water flows into the float chamber 14, the float 12 floats, the guide rod 34 contacts the valve rod 37, and the communication hole 42 is closed. Therefore, air does not flow into the upper chamber 28, the internal pressure becomes atmospheric pressure, the pressing force of the valve rod 37 disappears, the float 12 lifts the floating valve 13, and the valve element 36 closes the exhaust hole 24. Even after the exhaust hole 24 is closed, the float chamber is still exposed to the pressure in the pipeline.
The air in 14 is compressed and the liquid level rises, and internal pressure is generated and acts as a pushing force on the lower surface of the valve body 36.

Next, when the air in the pipeline flows into the float chamber 14, the liquid level is lowered and the float 12 is lowered. However, the floating valve 13 does not descend because the pushing force by the internal pressure acts on the lower surface of the valve body 36. Therefore, the guide rod 34 becomes the valve rod 37.
The communication hole 42 is opened apart from the above, and the pressure in the floating valve box 15 is transmitted to the upper chamber 28. Part of the air in the upper chamber 28 is discharged into the atmosphere through the small exhaust hole 33, but the small exhaust hole 33 is a communication hole.
Since the diameter is smaller than 42, the remaining portion acts as a pressing force on the valve rod 37 via the diaphragm 27. At this time, since the pressure receiving area of the diaphragm 27 is larger than the opening area of the exhaust hole 24, the pushing force to the valve rod 37 is larger than the pushing force acting on the lower surface of the valve body 36. In addition to the pushing down force of the diaphragm 27, the floating valve 13
The weight of itself and the weight of the guide rod 34 and the float 12 are
The floating valve 13 acts so as to move downward, that is, to move in the opening direction. Therefore, the floating valve 13 opens the exhaust hole 24, and the air in the floating valve box 15 is exhausted to the atmosphere from the opening 26 via the exhaust hole 24. Exhaust under this pressure is performed through the same exhaust hole 24 as in the case of the large amount exhaust, so that large amount exhaust is possible. When the internal pressures in the float chamber 14 and the upper chamber 28 decrease due to this exhaust, and the liquid level rises, the float 12 floats, the guide rod 34 contacts the valve rod 37, and the communication hole 42 is closed. Therefore, air does not flow into the upper chamber 28, the internal pressure decreases, and the pressing force of the valve rod 37 acting on the diaphragm 27 decreases, and the float 12 resists this pressing force and the floating valve 13
The valve body 36 closes the exhaust hole 24.

As described above, in the air valve of this embodiment, a large amount of air can be exhausted even under pressure, so that the refilling work can be performed in a short time. Further, since the internal pressure in the pressure chamber 17 acts on the valve rod 37 as a pressing force, the floating valve 13
To prevent the sticking phenomenon. Further, since the exhaust hole 24 and the valve body 36 are installed above the float 12 via the guide rod 34, the fluid in the float chamber 14 reaches the level of the exhaust hole 24 and the valve body 36. Never. Therefore, when the fluid is sewage, etc.
It is possible to prevent adhesion of dirt in the fluid to the valve body 36.

EFFECTS OF THE INVENTION As described above, according to the present invention, the communication hole that communicates between the inside of the floating valve box and the upper chamber of the pressure chamber is provided so as to penetrate through the central portion of the valve rod of the floating valve. Even when exhausting under pressure, the internal pressure of the upper chamber acts as the pushing force of the valve rod. Therefore, a large amount of air can be exhausted from the exhaust hole, so that not only can the water filling work be performed efficiently, but also the phenomenon of suction of the floating valve can be prevented. Further, the pushing-down force acting on the diaphragm, the weight of the floating valve, and the weight of the guide rod and the float tend to move the floating valve in the opening direction, so that the exhaust hole can be easily opened. Moreover, since the exhaust hole and the valve body are installed above the float through the guide rod, the fluid in the float chamber does not reach the level of the exhaust hole and the valve body. It is possible to prevent dirt in the fluid from adhering to the valve body.

[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. 11 ... Valve box, 12 ... Float, 13 ... Floating valve, 14 ... Float chamber, 15 ... Floating valve box, 16 ... Exhaust chamber, 17 ... Pressure chamber, 18 ... Fluid inlet hole, 24 ... Exhaust hole, 27 ... Diaphragm, 36 ... Valve, 37
… Valve, 42… Communication hole.

Claims (1)

[Claims] 1. A float chamber having a float having a guide rod extending upward and a floating valve having a valve body at a lower portion of the valve rod, the float having a fluid inflow hole at a bottom thereof. The 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 diaphragm are sequentially provided on the upper side, and the float is arranged to be able to move up and down in the float chamber. A valve element that can open and close the exhaust hole from below is arranged to be able to move up and down in the floating valve box, and the upper end of the valve rod extends upward and is connected to the diaphragm to connect the inside of the floating valve box and the upper chamber. A communicating hole is formed through the center of the valve rod, and the upper end of the guide rod is connected to the lower end of the valve rod so that it can move up and down by a certain amount. The lower end of the communication hole can be opened and closed at the upper end of the guide rod. Is, the pressure receiving area of the diaphragm is larger than the opening area of the exhaust hole, an upper chamber air valve, characterized in that in communication with the atmosphere by the small diameter of the small vent hole than the communication hole.