JPH0712256A - Air valve - Google Patents

Abstract

PURPOSE:To eliminate risk of poor operation caused by foreign matter such as contaminant through hindrance of its rising when a fluid such as dirty water is blown up from a pipeline and to apply a buoyancy due to air sump to a float. CONSTITUTION:To hinder foreign matter from rising, a skirt-shaped flapper 31 is provided whose foremost part at least 31a is formed from a resilient material and deforms elastically till the position in proximity to the inside surface of a valve box 1 when the fluid Q is blown up from the pipeline. In the mounting part 32 in the center, the flapper 31 is fitted fast on the bottom shaft part 21 of a float 10 which is set in the valve box 1 as capable of elevating and sinking and drives a valve element for opening and closing an exhaust hole, and a ring-form seal member 34 to seal the space to the inside surface of the valve box 1 is fitted on the periphery of the shaft part 21.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art In a sewer pipe or the like, an air valve is provided in order to discharge the air in the pipe to facilitate the flow of fluid or to supply the air into the pipe to facilitate drainage. There is.

A conventional general air valve is shown in FIG. In FIG. 3, the valve box 1 is composed of a valve box body 2 and a valve box lid 3, and a fluid inflow hole 5 communicating with a rising pipe 4a of a pipe line 4 for sewage or the like is formed at the bottom of the valve box body 2, and An exhaust hole 6 communicating with the atmosphere is formed on the valve box lid 3 side. Reference numeral 7 is a valve rod in which a valve body 8 for opening and closing the exhaust hole 6 is integrated, and the valve rod 7 is formed with a vent hole 9 penetrating in the axial direction. Reference numeral 10 denotes a float that is set up and down in the valve box 1 and has a connecting shaft 11 projecting from the upper end thereof, and a vertically elongated hole 12 formed at the upper end of the connecting shaft 11. By engaging the connecting pin 13 provided on the lower end side of the vent hole 9 of the valve rod 7 with the valve rod 7, the float 10 is closed to the valve rod 7 and the lower end opening of the vent hole 9 of the valve rod 7 is closed. The movable position and the released position are vertically movably connected to each other. Further, a rubber valve seat 14 is provided at the lower end opening of the vent hole 9 of the valve rod 7, and the upper end opening of the vent hole 9 is communicated with the pressure chamber 17 of the diaphragm portion 16 partitioned by the diaphragm 15. ing.

In the air valve having such a structure, the pipe line 4
Flowing through the fluid, that is, sewage Q such as sewage
When flowing into the inside of the valve box 1 through through, the float 10 is lifted by the buoyancy of the dirty water Q and the float 1
The valve body 8 interlocking with 0 closes the exhaust hole 6. At this time, the lower end opening of the vent hole 9 of the valve rod 7 is connected to the connecting shaft 11 of the float 10.
It has been blocked by. Then, when the air a flows into the valve box 1 together with the dirty water Q in the pipe line 4, the air a staying in the valve box 1 is replaced, and the liquid level of the dirty water Q in the valve box 1 drops, and the float 10 Also falls. At this time, the float 10 first descends by the length of the long hole 12 to move to the vent hole 9 of the valve rod 7.
Is released, and the internal pressure of the valve box 1 acts on the pressure chamber 17 through the vent hole 9 and acts as a force to push down the valve rod 7.

Then, with the valve body 8 pushed down,
The air a staying inside the valve box 1 is discharged from the exhaust holes 6, and the dirty water Q flows into the valve box 1 again, and the above-described operation is repeated. When the above-mentioned sewage Q is sewage, foreign matter such as filth is included.
The valve body 8 so that it will not come into contact with the tongue or the like and cause no trouble.
An air layer P is provided between and the liquid surface.

By the way, in the sewer system, when the filling work of the pipeline 4 is almost completed, the sewage Q and the air a may alternately flow into the rising pipe 4a. At that time,
The dirty water Q vigorously penetrates into the valve box 1 through the rising pipe 4a, and due to the vigor, the dirt M adheres to the sheet portion of the valve body 8 or reaches the diaphragm portion 16 side to function as an air valve. May be impaired, and depending on the sewage Q, bubbles or cotton-like foreign matter M may flow into the valve box 1 as they are, and they may also adhere to the sheet portion. As a result, the function of the air valve is impaired by reaching the diaphragm portion 16 side. Even if the air layer P is provided between the seal portion above the air valve and the liquid surface, the air a is compressed due to the increase in pressure, and the gap is reduced, so that the foreign matter M such as dirt in the seat portion is reduced. There is a great risk of being attached.

In order to solve these problems, conventionally, as shown in FIGS. 4 and 5, a skirt 22 made of synthetic resin is formed on the shaft portion 21 projecting to the lower end side of the float 10 and made of synthetic resin.
In the case where the central mounting hole portion 23 in the above is fitted and fixed, and when the dirty water Q containing foreign matter such as dirt is blown up from the side of the pipe line 4, the flapper 22 prevents the rise of foreign matter by the flapper 22. Proposed.

[0008]

However, in the conventional air valve having the above-mentioned structure, the flapper 22 is made of synthetic resin and blows up when the tip 22a of the flapper 22 is brought close to the inner peripheral surface of the valve box 1. Although foreign matter M can be prevented to some extent at the time of discharge, since the outflow of dirty water Q in the valve box 1 becomes worse during drainage,
The gap G between the tip 22a of the flapper 22 and the inner peripheral surface of the valve box 1 must be set to be relatively large, and therefore a sufficient blocking effect against the foreign matter M cannot be obtained.

Further, since there is a gap g between the inner peripheral surface of the central mounting hole portion 23 of the flapper 22 and the shaft portion 21, the air S inside the flapper 22 escapes to reduce the buoyancy and stop. There was a tendency that the position of the water surface to be watered went up and the sewage water Q approached the sheet portion of the valve body 8.

The present invention has been made in order to solve the above-mentioned problems of the prior art. When the fluid such as sewage is blown up, foreign matters such as dirt are prevented from rising by the flapper, while the air inside the flapper is prevented. It is an object of the present invention to provide an air valve capable of effectively utilizing buoyancy due to a pool.

[0011]

In order to achieve the above object, the present invention provides a valve box having a fluid inflow hole communicating with a pipe line at the bottom and an exhaust hole communicating with the atmosphere at the top.
At least a tip of an air valve having a float that is vertically movable in the valve box and a valve body that is provided in an interlocking connection with an upper portion of the float and that opens and closes an exhaust hole of the valve box. A skirt-shaped flapper that is made of an elastic material and elastically deforms to a position close to the inner peripheral surface of the valve box when the fluid is blown up from the pipe line to prevent foreign matter from rising At the lower end side shaft portion of the float, and a ring-shaped seal member for sealing between the outer peripheral surface of the shaft portion and the inner peripheral surface of the mounting hole portion is attached to the shaft portion. It has been fitted.

[0012]

According to the present invention, when dirty water is blown up as a fluid from the pipe side, at least the tip of the flapper attached to the lower end of the float spreads outward by the force of the dirty water and the inner peripheral surface of the valve box is expanded. Since the clearance between the valve and the valve is reduced and foreign matter such as dirt is prevented from rising, the smooth operability of the valve body is maintained. Further, at the time of drainage, the tip end of the flapper bends inward and the gap becomes large, so that drainage can be easily performed.

Further, since a seal member seals between the central mounting hole portion of the flapper and the shaft portion at the lower end of the float, an air reservoir is flown inside the flapper.
It acts as the buoyancy of the valve, lowers the water blocking surface, and allows the seat portion of the valve element to be kept away from the dirt.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view showing an air valve according to an embodiment of the present invention. The same parts as those of the conventional example shown in FIGS. Is omitted.

In FIG. 1, reference numeral 31 is an elastic material, for example, a skirt-shaped flapper made of rubber, and a central mounting hole portion 3 thereof.
2 (FIG. 2) is a shaft portion 21 protruding from the lower end of the float 10.
The flapper 31 is fitted and fixed to the tip portion 3 of the flapper 31.
1a is elastically deformed outward by the pressure when the dirty water Q is blown up, and its tip is close to the inner peripheral surface of the valve box 1, and when drained, it is elastically deformed inward and its tip is of the valve box 1 above. It is set to separate from the inner surface.

As shown in FIG. 2, an annular recess 33 is formed on the outer peripheral surface of the shaft portion 21, and the recess 33 has an outer peripheral surface of the shaft portion 21 and a central mounting hole of the flapper 31. A ring-shaped seal member, such as an O-ring 34, that seals between the inner peripheral surface of the portion 32 and the inner peripheral surface is fitted.

Since the basic operation of the air valve having the above-described structure is the same as that shown in FIG. 3, the description thereof will be omitted and only the operation of the essential parts will be described. When the dirty water Q is blown up from the rising pipe 4a of the pipe line 4, the blowing force of the dirty water Q causes the tip portion 31a of the flapper 31 to elastically deform outward as shown by the chain line in FIG. Since it is close to the inner peripheral surface of the valve box 1, the gap G in this portion is considerably small, and therefore foreign matter M such as dirt and bubbles contained in the waste water Q is prevented from rising from here, and the valve G While eliminating the possibility of sticking to the sheet of the body 8,
The amount of foreign matter M accumulated in the vicinity of the liquid surface is also significantly reduced.

When draining the dirty water Q in the valve box 1, the tip end 31a of the flapper 31 is elastically deformed inward as shown by the dotted line in FIG. Since it is separated from the peripheral surface, the gap G between the tip of the flapper 31 and the inner peripheral surface of the valve box 1 becomes large, and the waste water Q can be discharged smoothly without any trouble.

The flapper 31 is attached to the float 10.
It acts as a guide against, and an eccentric load on the valve body 8 can be prevented as much as possible. Further, a gap g between the inner peripheral surface of the central mounting hole portion 32 of the flapper 31 and the outer peripheral surface of the shaft portion 21.
Is sealed by the O-ring 34, air leakage from the gap g is eliminated, and an air pool S is formed inside the flapper 31. This air pool S is the float 10
Since it acts to promote the buoyancy of the valve, the liquid level at which the water is stopped is lowered, and the distance between the dirty water Q and the sheet portion of the valve body 8 is increased, so that foreign matter M such as dirt adheres more. Less likely to happen. Further, from the position where the operating position at the time of exhausting under pressure balances the float buoyancy and the weight of the valve body 8, the flapper 31
It will be further lowered by the addition of buoyancy due to the air pocket S inside.

Further, the seat surface pressure of the valve body 8 is increased by the buoyant force due to the air pool S in the flapper 31. Although the flapper 31 is entirely made of rubber in the above embodiment, at least only the tip portion 31a of the flapper 31 may be made of rubber. Further, it is needless to say that not only the rubber but also other elastic materials can be used.

[0021]

As described above, according to the present invention, the flapper, at least the tip of which is made of an elastic material, is attached to the lower end of the float in the valve box to blow up the fluid from the pipe line. At this time, since it is elastically deformed to be brought close to the inner peripheral surface of the valve box, even if the fluid contains foreign matter such as dirt such as dirty water, the rise of this foreign matter is prevented and the valve seat sheet is prevented. It is possible to surely prevent the valve body from adhering to a portion or the like and maintain the smooth operability of the valve body. Moreover, since the ring-shaped seal member seals between the shaft portion at the lower end of the float and the central mounting hole portion of the flapper, the liquid surface position is lowered by the buoyancy of air in the flapper. It is possible to more reliably prevent foreign matter from adhering to the sheet portion of the valve body.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an air valve according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the air valve according to the embodiment.

FIG. 3 is a vertical cross-sectional view showing a conventional general air valve.

FIG. 4 is a vertical cross-sectional view showing a conventional air valve.

5 is an enlarged cross-sectional view of the main part of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve box 4 Pipe line 5 Fluid inflow hole 6 Exhaust hole 8 Valve body 10 Float 21 Shaft part 31 Flapper 31a Flapper tip part 32 Flapper central mounting hole part 34 Ring-shaped seal member Q Fluid

Claims (1)

[Claims] 1. A valve box having a fluid inlet hole communicating with a pipe line at the bottom and an exhaust hole communicating with the atmosphere at the upper part, and a float arranged in the valve box so as to be vertically movable. And an air valve having a valve body that is provided in an interlocking connection with the upper portion of the above-mentioned float to open and close the exhaust hole of the valve box, at least the tip end portion of which is made of an elastic material and blows up the fluid from the conduit. At the same time, a skirt-shaped flapper that elastically deforms to a position close to the inner peripheral surface of the valve box to prevent foreign matter from rising is fitted and fixed to the lower end side shaft portion of the float at the central mounting hole. At the same time, the ring-shaped seal member for sealing between the outer peripheral surface of the shaft portion and the inner peripheral surface of the central mounting hole portion is fitted to the shaft portion.