JPH06213346A - Air valve for contaminated water - Google Patents

Abstract

PURPOSE:To supply a large quantity of air quickly at the time of steep generation of negative pressure and prevent the pipeline from damages by furnishing a valve element which is operated with a float to open and close an air hole provided in the upper lid of a valve box, and by joining a check valve capable of being opened to the outside air to the side of the valve box. CONSTITUTION:When no water is sent to the water delivery pipeline and a valve box is free from water in the inside, a float 4 is in the down position and a valve element 3 is separated from air hole valve seats 23, 24 against leaf springs 34, 35, and a major air hole 21 and a minor air hole 22 are both opened fully while a check valve 5 is closed. When water is fed and the pipeline is going to be filled with water, the air therein is exhausted to outside the valve box via the two air holes 21, 22. When the float 4 is elevated by the buoyancy in association with flowing-in of the water, they are blocked by the valve element 3 in the sequence first the major hole 21 and then the minor 22. If the water in the pipeline flows out to put the pipeline in negative pressure under this full closed condition of air valve, the check valve 5 is opened to introduce the outside air, and outflow of water takes place quickly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air valve installed in a pipeline,
Particularly, the present invention relates to an optimal air valve when the fluid in the pipeline is polluted water containing solid foreign matter.

[0002]

2. Description of the Related Art There are various different cases in which an air valve is used. However, the object of the present invention is that the air valve is installed in a water supply pipe line and the water is supplied from the inside of the pipe line. Is an air valve used for the purpose of supplying air to the inside of the pipe when draining from the pipe, and for discharging air or gas separated from the water when the pipe is filled with water. As a general structure of the air valve, the actual construction is 52-52121.
As shown in FIG. 5 cited from the publication, a float 4a that moves up and down in response to a change in water level is provided in a valve box 1a, and the vertical movement of the float 4a opens and closes an air hole 21a to supply exhaust air and air supply. Although it operates rationally, when the fluid in the pipeline is polluted water containing solid foreign matter such as sewage, there are many problems with this configuration, and many improved techniques in addition to this basic principle. Proposed.

For example, the actual Kaihei 3-6976 shown in FIG.
According to the publication No. 7, the float 4b is vertically floatable inside the valve box 1b, and the valve body 3b for opening and closing the valve opening 21b is the valve opening 21.
A part of the tilting body 102, which is supported in a cantilever manner by a fulcrum 101 in the immediate vicinity of b, is made of soft rubber and is set so that the valve port 21b can be opened and closed. The float 4b is suspended from the other end of the tilting body and lifted and lowered by the water level in the valve box. The second valve box valve seat 103 is provided in the valve box further above the normal valve closed position of the float 4b, and the floating of the valve body is prevented and the fluid that has entered from the pipe line can be further raised. It is a configuration to be lost. In other words, even if polluted water or a strongly corrosive chemical liquid flows in the pipeline and the valve closing function is lost due to corrosion, etc., the rise of the float prevents the polluted water from flowing out of the valve box, and It is said to be effective in preventing the deterioration of odor and stench.

As another example, JP-A-4-4374.
In the publication, as shown in FIG. 7, a large air hole 21c and a small air hole 22c penetrating the upper lid 2c of the valve box 1c are closely punched, and large and small air hole valves formed on the respective lower end surfaces of the air holes. The large and small air holes 21c and 22 are connected to and separated from the seats 23c and 24c.
The compound valve body 3c for opening and closing c is rotatably supported from the upper part of one side part, and the float 4c is suspended at the other end part by a hanging rod 41c.
Suspended by c. The composite valve body 3c has a common flexible elastic body 31c that contacts and separates large and small air hole valve seats 23c and 24c.
And two levers 32c and 33c for separately supporting the lower part of the elastic body 31c, and the levers are urged upward by two different types of leaf springs 34c and 35c. As a result of this configuration, the float is located in the lower valve box, and even when it is closed, it creates an air layer in the upper valve box, and there is no risk that the air holes will get wet with the conduit water. It is said that it is suitable for polluted water, such as a sewer pipe line, because there is no trouble that water flows out and pollutes the valve chamber.

[0005]

As described above, the air valve is basically operated by opening and closing the air hole by a float that moves up and down according to the water level in the valve box to discharge and inhale the necessary air. At first, in order to satisfy this function, it suffices to punch one air hole through the upper lid. However, as cited here, in the pipeline that handles a fluid containing a considerable amount of solid foreign matter such as sewage or agricultural water, various problems associated with this occur, and various configurations have been added to solve this problem. . As a remarkable tendency, instead of directly opening and closing the air hole by simple lifting and lowering of the float, multiple large and small air holes are provided and two valve body valve seat surfaces are formed to respond to the condition inside the pipeline. Therefore, various structures have been proposed as suitable means for opening and closing as appropriate, but with this, another problem has come to the surface.

In prior art pneumatic valves, the valve housing is directly
Alternatively, the pipe is communicated with the pipe through a repair valve that temporarily disconnects from the pipe, but the communicating portion is a lower opening that opens to the lower part of the valve box. This opening is formed with an area substantially the same as the cross-sectional area of the pipeline, and is set so that the valve function can be rapidly exhibited in response to changes in the situation in the pipeline. However, as shown in FIG. 5, if it is used in a pipe for clean water, there is no particular problem even if the air holes are opened in almost the same area. However, regarding a special air valve for flowing polluted water into the pipe, It is preferable to use a sealing method to contain the bad odor as much as possible and prevent the sewage from overflowing from the valve opening.Because it is necessary to add a special function for that purpose, the upper air hole can be equal to the area of the lower opening due to the mechanism. It is extremely difficult to secure a wide opening. This is a basic type in which the air holes are opened and closed directly by raising and lowering the float, and it is difficult to adopt it because there is concern that the contaminated water may be ejected outside the valve, the odor may leak, the various mechanisms inside the valve box may be corroded, or damaged. If the improved type that sets multiple air paths by providing air holes and valve seat surface of the valve box, the mechanism required for opening and closing the air holes will be complicated, and if the large air holes have a large diameter, they will be opened and closed. This is because there is no choice but to increase the size of the mechanism, so that the start of the valve function slows down and the response is delayed, but the production cost rises, which is a large practical limitation.

As described above, it is essentially inevitable as an air valve for polluted water that even a large air hole is much narrower than the opening at the lower part of the valve box, but this is the inside of the pipeline. Induce difficulties when stopping water flow. Since the air valve is provided for the purpose of supplying and exhausting air and gas in the pipeline, its installation position is usually always installed at a high position in the pipeline. Here, when the passage of water through the pipeline is stopped, the fluid in the pipeline located at a position lower than the air valve flows out toward the lower side and the inside of the pipeline becomes a negative pressure. That is, although a large amount of air must be quickly supplied into the pipeline here,
Since the cross-sectional area of the air hole for taking in air from the outside air is extremely smaller than the cross-sectional area of the pipeline, this requirement cannot be satisfied at all, and the inside of the pipeline becomes a vacuum state and the pipeline is affected by external pressure. Is pressed, and there is a high possibility that the tube may be ruptured or deformed in some cases.

In order to solve the above-mentioned problems, the present invention can quickly operate the complicated and fine air supply and discharge as in the prior art, and can quickly supply a large amount of air when a sudden negative pressure occurs. The purpose of the present invention is to provide a new air valve that can ensure the safety of the pipeline.

[0009]

The air valve according to the present invention comprises:
A valve box 1 having a lower opening 11 communicating with the water supply line A directly or via a repair valve B, and a valve body 3 for opening and closing at least one air hole 21 penetrating an upper lid 2 of the valve box 1. , A float 4 which is engaged with the valve body 3 and is vertically movable therein, and a side opening 12 having a cross-sectional area substantially equal to that of the lower opening 11 is formed in a side portion of the valve box 1. One opening 51 communicating with the partial opening 12 on almost the entire surface, and the other opening 52.
The above problem was solved by joining the check valve 5 that was opened to the outside.

[0010]

The cross-sectional area of the side opening 12 is substantially the same as the cross-sectional area of the pipe and the lower opening 11 of the valve box connected to this pipe. The valve element of the check valve swings due to the difference between the external pressure and the internal negative pressure,
The outside air is rapidly sucked from the opening 52 opened to the outside air through the opening 51 and the side opening 12 and guided to the inside of the pipeline, and the shortage of air that cannot be followed only by the air supply from the large and small air holes is eliminated. It is applied to prevent the inside of the pipe from falling into a vacuum state. When the negative pressure in the pipeline is released, there is no pressure difference with the outside air, so the valve body is naturally pushed back and makes contact, and closes the check valve as before. This check valve automatically operates only when the pressure on the pipeline side becomes negative, and solves this problem by solving this condition.

[0011]

1 to 4 are longitudinal sectional front views showing one embodiment of the present invention by action. This example is shown in FIG.
The air valve of the related art is shown as a basic valve body, but the shape and action of the air valve body are not limited to this figure, and the invention can be applied to any air valve. However, as a result of the configuration adopted to solve various problems that occur when inserting polluted water into a pipeline as a fluid, when the cross-sectional area of the air hole is much smaller than the lower opening of the valve box. Can be said to be particularly effective.

In each figure, a valve box 1 comprises an upper valve box 13 and a lower valve box 14, and a large air hole 21 and a small air hole 22 are formed through an upper lid 2 covering the upper valve box 13. Perforated side by side. The lower part has a lower opening 11 and is connected to the conduit A through a repair valve B. It is the valve body 3 that opens and closes the large and small air holes 21 and 22, and the flexible elastic body 31 that closes both of them in common or by pressing only the large air hole 21 and the elastic body 31 respectively. It is a composite valve body composed of two levers 32 and 33 that are separately supported, and leaf springs 34 and 35 that bias the levers upward and downward in a strong and weak manner. The valve body 3 is tiltably supported by a support shaft 36 above an end portion in the valve box, and the other end is floated by a suspension rod 41.
Hangs up and down freely. Therefore, one or both of the large and small air holes are opened and closed by the balance between the buoyancy of the float and the urging force of the leaf spring.

The characteristics of this air valve are that the inner shell of the pipe is exhausted when water is passed, the air is supplied to the pipe when drained from the pipe, and the pipe is pressurized to fill the pipe. In this state, air and gas separated from the water are discharged smoothly under pressure, and even when the valve is closed because the float is located at the bottom of the valve box, an air layer is formed at the top of the valve box. Therefore, the air holes, the valve box valve seat, the elastic body, etc. do not get wet with sewage, and there is no possibility that sewage will escape to the outside of the valve and pollute the surroundings during exhaust.

A side opening 12 having substantially the same area as that of the lower opening is bored through the side wall of the lower valve box 14, and a swing type check valve communicating with an opening 51 having substantially the same area as the side opening. 5 is connected. The other opening 52 of the check valve also preferably has an area which is approximately equal to the opening area mentioned above. A valve body 54 is pivotally supported in only one side in a check box valve box 53 so as to be selectively swingable. When the valve body 54 swings around the swing shaft 57 as a fulcrum, the valve body valve seat 55 fixed to the opening 52 side of the valve body comes into contact with and separates from the valve box valve seat 56, and unilaterally opens and closes the check valve. Although the form of the check valve is not questionable, the communication area with the valve box 1 is one preferable requirement.

The operation of the present embodiment will be briefly described with reference to the drawings. FIG. 1 shows an exhausted state, and when there is no water in the water supply pipe and no water in the valve box, the float 4 has buoyancy. Does not work, the gravity of the float trying to separate the valve body 3 from the air hole valve seats 23 and 24 is maximum, so that the valve body 3 resists the biasing force of the leaf springs 34 and 35 and the air hole valve seats. Separated from the large air hole 21 and the small air hole 22, both are fully opened and the check valve 5
Is closed.

FIG. 2 shows a fully closed state. When the passage of water begins and the inside of the pipe line is filled with water, the air in the pipe line enters the valve box through the lower opening 11, passes through the large air holes 21 and the small air holes 22, and is discharged outside the valve box. It When the pipe becomes full and water enters the valve box 1 and its water level rises, the float 4
Since the buoyant force acting on the valve body 3 gradually increases, the gravity of the float acting on the valve body 3 gradually decreases, and when it exceeds the biasing force of the leaf springs 33 and 34, the valve body 3 first closes from the large air hole 21. At first, the small air hole 22 is further closed to completely close the air valve, and the elastic body 31 is separately pushed upward from below the respective small and large air hole valve seats 23 and 24 so as to come into close contact therewith. It In addition to this bias,
A value obtained by multiplying the pressure difference between the inside and outside of the valve (the pressure difference between the pressure inside the valve box and the atmospheric pressure) by the cross-sectional area of the air hole is added as a pressing force to be fully closed.

FIG. 3 shows the state of exhaust under pressure. With the air valve fully closed, air and gas separated from the water accumulate in the upper part of the valve box, and when the water level drops due to this pressure, the buoyancy acting on the float 4 decreases, so it acts on the valve body 3. The gravity of the floating float increases, and when the urging force pressing from the bottom of the small air hole 22 is overcome, the contact surface of the small air hole 22 of the valve body 3 with the valve seat 24 is cut from the cuts of the levers 32 and 33. Only the small air hole 22 is opened by being bent and separated downward, and the air and gas accumulated in the upper portion of the valve box are exhausted under pressure from the small air hole 22. When exhausting under pressure ends and the water level rises, the float 4 also rises and the elastic body 31 closes the small air hole 22 again.

FIG. 4 shows the state of air supply, which is interlocked with the drop of the water level when the water flow in the pipeline stops and the water flows out from the pipeline downstream of the air valve, or when the water is drained from the pipeline. Then, the float 4 descends, the small air hole 22 and the large air hole 21 are opened in this order, and when the pipe line becomes a negative pressure, the valve body of the check valve 5 is rotated by the pressure difference between the inside and the outside to open the valve and open the outside air. Is aspirated and rapidly filled into the conduit.

[0019]

In the air valve according to the present invention, the fluid in the pipeline is
It is a special liquid such as polluted water containing solid foreign matter or corrosive chemical liquid, and in the case of an air valve in which the opening area of the air hole is set to be relatively small in response to various problems that may occur as a result. Produces a particularly noticeable effect. In such a case, while maintaining the special action based on the various configurations added to the air valve, there is a new concern that the pipeline itself may rupture or deform when water is stopped. The effect of overcoming the above-mentioned problems and ensuring the safety of the pipeline is realized.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional front view showing another state of the above figure.

FIG. 3 is a vertical sectional front view showing another state of the above figure.

FIG. 4 is a vertical sectional front view showing another state of the above figure.

FIG. 5 is a vertical sectional front view showing a conventional technique.

FIG. 6 is a vertical sectional front view showing another conventional technique.

FIG. 7 is a vertical sectional front view showing still another conventional technique.

[Explanation of symbols]

 1 valve box 2 upper lid 3 valve body 4 float 5 check valve 11 lower opening 12 side opening 21 large air hole 22 small air hole 23 valve seat 24 valve seat 31 elastic body 32 lever 33 lever 34 leaf spring 35 leaf spring 51 opening 52 Opening 53 Valve box 54 Valve body 55 Valve body Valve seat 56 Valve box Valve seat 57 Swing axis A Pipe line B Repair valve

Claims (2)

[Claims] 1. A valve box 1 having a lower opening 11 communicating with the water supply line A directly or via a repair valve B, and at least one air hole 21 penetrating an upper lid 2 of the valve box 1 is opened and closed. In an air valve comprising a valve body (3) and a float (4) which is engaged with the valve body (3) and is vertically movable, a side opening having a cross-sectional area substantially equal to that of the lower opening (11) on the side of the valve box (1) Air for polluted water, characterized in that it is provided with 12 and has one opening 51 which communicates with the side opening 12 almost entirely, and the other opening 52 is joined with a check valve 5 opened to the outside air. valve. 2. The check valve 5 according to claim 1, wherein the check valve 5 is a valve box 53.
Inside the swing shaft 5 so that it can swing only to the side opening 12 side of the air valve.
An air valve for polluted water, which is a swing type having a valve element 54 pivotally supported by 7.