JP2022168710A - air valve device - Google Patents

Abstract

[PROBLEMS] To provide an air valve device in which an air valve can be easily installed even when there is not much space above a pipe.
The air valve device 1 includes a pipe 2 through which water flows, and a constricted portion 31 connected to the pipe 2 at two points, the inner diameter of which gradually narrows from the upstream side to the downstream side, thereby increasing the flow velocity of the water. an upper pipe 4 connected to the upper part of the detour pipe 3 and the upper part of the pipe 2 in the vicinity of the downstream end of the narrowed portion 31; and the upper pipe 4 at the upper part of the detour pipe 3 and an air valve 5 connected in the vicinity of the connection.
[Selection drawing] Fig. 6

Description

TECHNICAL FIELD The present invention relates to an air valve device that is connected to a pipe through which water flows and performs exhaust.

The pneumatic valve is connected to one or several of the connected pipes forming it at the required location, such as a sewage system, an industrial water pipeline or an agricultural water pipeline. The air valve has a function of discharging air (including other gases) mixed in water flowing through the piping to the outside. Pneumatic valves are widely used in various places of need. The air valve has a large volume exhaust (rapid exhaust) function that exhausts a large amount of air that has accumulated in it after piping work, etc., to the outside through a large air hole, and water flows through the piping at normal pressure. It is widely known that a small amount of air that has entered the pipe for various reasons is discharged to the outside through a small air hole (for example, Patent Documents 1 and 2).

An air valve having both a large-volume exhaust function and a small-volume exhaust function generally has, as a basic structure, a valve box connected to a pipe, a lid formed with a large air hole and attached to the valve box, and a valve box. A floating valve body arranged inside and able to block the large air hole of the cover body from below, and a float valve body arranged in the valve box are provided. The small air holes are formed in the lid body (for example, Patent Document 1, etc.) or formed in the floating valve body (for example, Patent Document 2, etc.). The float valve body can block the small air holes from below. The float valve body and the floating valve body have a specific gravity smaller than that of water. In the vicinity of the air valve, a separate water shutoff valve (including repair valves) is usually installed to stop water from entering the valve body (including repair valves) for repairing the air valve. ing.

Air is exhausted through the large air holes when a large amount of air is exhausted. A large amount of air is exhausted from when the water shut-off valve is opened and water enters the valve box from the piping until the floating valve body comes into close contact with the lid body from below to close the large air hole. After the large amount of exhaust is finished, a small amount of exhaust is performed. At the time of small amount of air exhaust, air is exhausted through small air holes formed in the lid or the floating valve. When the water surface rises and the distance from the water surface to the small air holes reaches a predetermined distance, the float valve plugs the small air holes from below and the exhaust stops. After that, air mixed with water enters the valve body from the piping, and when the amount of air from the water surface to the small air holes increases and the water level drops, the float valve body drops, the small air holes are opened, and a small amount of exhaust is released again. done. Then, when the water surface rises due to the small amount of exhaust and the distance from the water surface to the small air holes reaches a predetermined distance, the float valve body closes the small air holes from below, and the exhaust stops.

Also known is an air valve that has only a small amount of exhaust function (for example, Patent Document 3, etc.). Such an air valve generally has, as a basic structure, a valve box (cylinder in Patent Document 3) connected to a pipe, and a lid body (in Patent Document 3, a , an end block, an end cap, etc.), and a float valve body arranged in the valve box and capable of blocking the small air holes of the lid body from below. Exhaust (a small amount of exhaust) is performed through a small air hole after the water stop valve is opened and water enters the valve box from the piping. When the water surface rises and the distance from the water surface to the small air holes reaches a predetermined distance, the float valve plugs the small air holes from below and the exhaust stops. After that, air mixed with water enters the valve body from the piping, and when the amount of air from the water surface to the small air holes increases and the water level drops, the float valve body drops, the small air holes are opened, and the air is exhausted again. will be Then, when the water surface rises due to the exhaust and the distance from the water surface to the small air holes reaches a predetermined distance, the float valve plugs the small air holes from below, and the exhaust stops.

Japanese Utility Model Laid-Open No. 4-126076 JP 2009-121678 A JP 2012-026570 A

Since the air valve operates properly with a small air hole closed and opened by the float valve body, the float valve body and the like are usually large, and therefore the air valve as a whole is large. However, pneumatic valves are widely used in various required locations as described above. In some cases, for example, there is not much room from the pipe to the ground above the pipe, such as when the pipe is over another pipe for another purpose on a general road, or when the depth of the pipe is originally shallow. In addition, for example, when the piping is laid over the bridge structure to avoid the bridge structure, there may not be much room from the piping to the upper bridge structure. In such cases, it may not be easy to install and operate the air valves properly.

In addition, when water is made to flow over a hill using the principle of siphon, the internal pressure in the pipe on the hill becomes close to negative pressure or negative pressure, and an air valve is installed above it. Also, the air valve may not operate properly.

The present invention has been made in view of such a reason, and its object is to install an air valve to prevent the air from flowing out even when there is not much room above the pipe or when the inside of the pipe becomes negative pressure. An object of the present invention is to provide an air valve device capable of properly operating a valve.

In order to achieve the above object, the air valve device according to claim 1 is connected at two points to at least one pipe through which water flows and one of the at least one pipes, and has an inner diameter of A detour pipe having a narrowed portion that increases the flow rate of water by gradually narrowing from the upstream side to the downstream side, and an upper portion of the detour pipe near the downstream end of the narrowed portion and the one pipe or the An upper pipe connected to an upper portion of another pipe out of at least one pipe, and an air valve connected to an upper portion of the detour pipe near a connecting portion of the upper pipe.

The air valve device according to claim 2 is the air valve device according to claim 1, wherein the detour pipe has an inner pipe in a part thereof, and the narrowed portion is formed in the inner pipe. there is

The air valve device according to claim 3 is the air valve device according to claim 2, wherein the connecting portion of the upper pipe above the detour pipe is provided above the outer surface of the inner pipe. there is

The air valve device according to claim 4 is the air valve device according to any one of claims 1 to 3, wherein the air valve is located above the detour pipe above the connecting portion of the upper pipe. connected downstream.

The air valve device according to claim 5 is the air valve device according to any one of claims 1 to 4, wherein the detour pipe is connected to the one pipe at the two points below it. there is

The air valve device according to claim 6 is the air valve device according to any one of claims 1 to 5, wherein the pipe to which the upper pipe is connected among the at least one pipe has an upper part The periphery of the connecting portion of the upper pipe in the above protrudes upward.

The air valve device according to claim 7 is the air valve device according to any one of claims 1 to 6, wherein the detour pipe includes the connecting portion of the upper pipe and the connecting portion of the air valve. Water stop valves are provided on the upstream and downstream sides of the area containing the .

According to the air valve device of the present invention, it is possible to install the air valve and operate the air valve appropriately even when there is not much space above the pipe or when the inside of the pipe becomes negative pressure. can.

1 is a plan view of an air valve device according to an embodiment of the invention; FIG. FIG. 2 is a cross-sectional view of the same air valve device taken along line AA in FIG. 1; FIG. 2 is a cross-sectional view of the same air valve device taken along line BB in FIG. 1; FIG. 4 is a cross-sectional view showing an example of an air valve of the air valve device; FIG. 3 is a cross-sectional view corresponding to FIG. 2 for explaining the operation of the air valve device; FIG. 4 is a cross-sectional view corresponding to FIG. 3 for explaining the operation of the air valve device; FIG. 10 is a side view schematically showing a reduced air valve device according to another embodiment of the present invention; It is a top view of one piping side of an air valve apparatus same as the above. It is a top view of the other piping side of the air valve apparatus same as the above.

DETAILED DESCRIPTION OF THE INVENTION Embodiments for carrying out the present invention will be described below. An air valve device 1 according to an embodiment of the present invention includes a pipe 2 (one pipe), a detour pipe 3, an upper pipe 4, and an air valve 5, as shown in FIGS. there is Also, the air valve device 1 can be provided with two water stop valves 6 .

The pipe 2 forms a water supply and sewerage system, an industrial water pipeline, an agricultural water pipeline, etc., together with other pipes connected thereto (see FIGS. 5 and 6, which will be described later). In the pipe 2 here, water flows from the upstream side (the right side in FIG. 1 etc.) to the downstream side (the left side in FIG. 1 etc.). An upper pipe 4, which will be described in detail later, is connected to the upper portion (usually, the zenith portion) of the pipe 2. As shown in FIG.

It is preferable that the upper portion of the pipe 2 is provided with a protruding portion 2a that protrudes upward. In this case, the upper tube 4 will be connected to the projecting portion 2a. That is, the periphery of the connecting portion of the upper tube 4 protrudes upward. Then, the air (including other gases) mixed in the water flowing through the pipe 2 accumulates on the projecting portion 2a and is easily discharged from the upper pipe 4 as described later.

The detour pipe 3 is connected to the pipe 2 at two points (an upstream connection portion and a downstream connection portion). Part of the water flowing into the pipe 2 bypasses the detour pipe 3 and returns to the pipe 2. In other words, part of the water that has flowed into the pipe 2 flows into the bypass pipe 3 from the connection portion on the upstream side, and flows out to the pipe 2 from the connection portion on the downstream side.

The detour pipe 3 is not particularly limited in its length, and is extended to an appropriate position (appropriate horizontal and/or vertical position) for installing the air valve 5, which will be described in detail later. It is also possible to

The detour pipe 3 is preferably thinner than the pipe 2 . In other words, the inner diameter of the detour pipe 3 (the diameter of the hollow portion) is preferably smaller than the inner diameter of the pipe 2 . For example, the inner diameter of the detour pipe 3 can be one-fifth or less of the inner diameter of the pipe 2 . As a result, the position where the air valve 5, which will be detailed later, is installed is lowered.

Moreover, the detour pipe 3 is preferably connected to the pipe 2 at the two lower portions. That is, the vertical center position of the detour pipe 3 is preferably lower than the vertical center position of the pipe 2 . Then, the position where the air valve 5 is provided becomes lower, and for example, when the detour pipe 3 is thinner than the pipe 2, the bottom position of the detour pipe 3 and the bottom position of the pipe 2 (bottom position including the flange (Fig. 3)), the position at which the air valve 5 is installed is further lowered.

The bypass tube 3 has a narrowed portion 31 . The constricted portion 31 increases the flow velocity of water by gradually narrowing the inner diameter from the upstream side (the right side in FIG. 3) to the downstream side (the left side in FIG. 3). The constricted portion 31 can be formed in the inner tube 3a by having the inner tube 3a in a part of the inside of the detour tube 3. As shown in FIG. The inner pipe 3a is separated from the main body (outer pipe) 3b of the detour pipe 3 as it goes downstream in the middle of the detour pipe 3, and extends to the downstream end of the narrowed portion 31 (the exit of the narrowed portion 31). formed. At the position (horizontal position) where the inner tube 3a is formed, the outer tube 3b is generally thickened.

The upper pipe 4 is connected to the upper portion (usually the zenith portion) of the detour pipe 3 and the upper portion of the pipe 2 in the vicinity of the downstream end of the narrowed portion 31 . The upper tube 4 is a thin tube. Although the specific extension method of the upper pipe 4 is not particularly limited, as shown in the figure, the upper pipe 4 extends upward from the connecting portion at the upper part of the detour pipe 3, and the pipe 2 (and its projecting portion 2a) extends upward from the top of the pipe 2, extends horizontally to the horizontal position of the connection at the top of the pipe 2 (bends and extends as necessary), and then extends downward to the connection at the top of the pipe 2 is possible.

When the constriction 31 is formed in the inner tube 3a, the connection of the upper tube 4 at the top of the detour tube 3 can be provided above the outer surface of the inner tube 3a. Then, as will be described later, when the air moves from the upper part of the pipe 2 through the upper pipe 4 to the upper part of the detour pipe 3, it naturally tends to move downstream.

The pipe 2, the detour pipe 3, and the upper pipe 4 may be integrally molded, connected to each other by welding, or connected to each other with bolts or the like by providing a flange at the connecting portion, or using a saddle branch faucet. It is possible to connect them to each other by a drilling method.

The air valve 5 is connected to the upper part of the detour pipe 3 in the vicinity of the connecting part of the upper pipe 4 . The air valve 5 is normally connected downstream of the connecting portion of the upper pipe 4 above the detour pipe 3 . In FIG. 3 and the like, the air valve 5 is connected to the detour pipe 3 via a connecting member.

The air valve 5 is not particularly limited as long as it has a function of discharging air mixed with water and entering the air to the outside. It may be a valve, or it may be an air valve having both a large amount exhaust function and a small amount exhaust function.

For example, as shown in FIG. 4, the air valve 5 having only the function of discharging a small amount of air includes a valve box 51 connected to a pipe, a lid body 52 formed with a small air hole 5a and attached to the valve box 51, and a valve and a float valve body 53 arranged in the box 51 and capable of closing the small air hole 5a of the lid body 52 from below (see Patent Document 3, etc.). The float valve body 53 has a smaller specific gravity than water. FIG. 4 shows a state in which the small air hole 5a is open and exhausted to the outside (to the atmosphere) through the small air hole 5a. is blocked by a float valve body 53 from below.

The water stop valves 6 can be provided on both sides (that is, on the upstream side and the downstream side) of the area including the connecting portion of the upper pipe 4 and the connecting portion of the air valve 5 in the detour pipe 3 . The water stop valve 6 can stop (stop water) water from entering the valve box 51 of the detour pipe 3 for repairing the air valve 5 or the like. The water stop valve 6 may be what is generally called (for example, a repair valve, etc.) as long as it can stop water. 3 and the like show a state in which the water stop valve 6 is open, and water flows through the hollow holes of the water stop plate 61. As shown in FIG. When the water stop plate 61 is turned about 90 degrees from the state where the water stop valve 6 is open, the water flow is blocked by the water stop plate 61 and the water stop valve 6 is closed.

The water stop valve 6 can be provided in the middle of the air valve 5 and the bypass pipe 3 (that is, the position of the connecting member interposed between the air valve 5 and the bypass pipe 3 in FIG. 3, etc.). , As described above, by providing on both sides of the area including the connecting portion of the upper pipe 4 and the connecting portion of the air valve 5, the installation position of the air valve 5 can be kept low even if the water stop valve 6 is provided. be able to.

With the configuration described above, the air valve device 1 operates as follows (see FIGS. 5 and 6). Some of the water (indicated by solid lines with arrows in FIGS. 5 and 6) that has flowed into the pipe 2 from another pipe (shown on the right side in FIGS. 5 and 6) connected to the upstream side is a part of the water stop valve 6 is open, it flows into the detour pipe 3 through the connection part on the upstream side with the detour pipe 3. The water that has flowed into the detour pipe 3 passes through the narrowed portion 31, returns to the pipe 2 through the connection portion on the downstream side with the pipe 2, and is connected to another pipe connected to the downstream side (in FIGS. 5 and 6, shown on the left).

Here, the water passing through the constricted portion 31 increases in flow velocity at the downstream end of the constricted portion 31 and decreases in pressure in the vicinity thereof due to the venturi effect (aspirator effect). As a result, water flows toward the inside of the detour pipe 3 in the vicinity of the connecting portion of the upper pipe 4 located near the downstream end of the constricted portion 31 . In the upper pipe 4 , water flows from the connecting portion of the pipe 2 to the upper pipe 4 toward the connecting portion of the detour pipe 3 to the upper pipe 4 . At this time, if air is accumulated inside the pipe 2, the air (indicated by broken lines with arrows in FIGS. 5 and 6) is mixed with water and moves through the upper pipe 4 into the detour pipe 3. .

The air that has moved into the detour pipe 3 is taken into the air valve 5 provided near the connection of the upper pipe 4, and then exhausted to the outside (to the atmosphere).

When the water stop valve 6 is closed, no water flow occurs in the upper pipe 4 because the pressure does not drop in the vicinity of the downstream end of the constricted portion 31 in the bypass pipe 3 .

The air valve device 1 described above is not limited to a place where it can be used, but it is particularly useful when used in a place where there is not much space above the pipe 2 . For example, when the pipe 2 and the pipe connected to it on a general road go over another pipe for another purpose (when it comes to pass over another pipe for another purpose that crosses) In some cases, such as when the pipe is buried in a shallow depth, there may not be much room above the pipe 2 above the ground. , there may not be much room from the piping to the structure of the bridge above. Even in such a case, the air valve device 1 can be provided with the air valve 5 and can operate properly. If the air valve 5 is quite large, the detour pipe 3 and the upper pipe 4 may be extended to a place where the air valve 5 can be installed.

Next, an air valve device 7 according to another embodiment of the invention will be described. The air valve device 7, as shown in FIGS. The upper pipe 4 is connected to the upper part of the detour pipe 3 and the upper part of the pipe 9 . The upper tube 4 may be quite long, and in addition to a hard tube, a strong rubber hose or the like can be used. Also, the two water stop valves 6 are the same as described above. Further, the pipe 9 may be provided with a projecting portion 9a similar to the projecting portion 2a described above.

Such an air valve device 7 uses the principle of a siphon to allow water to flow over a hilly area (in the case of a siphon type water intake system), and the internal pressure in the pipe 9 in the hilly area is negative. The piping 8 should be located at a low point (that is, a position where the internal pressure in the piping 8 becomes positive), such as when the gas-liquid separation is likely to occur due to the proximity or negative pressure. can be done. In the upper pipe 4, as described above, the venturi effect causes water to flow from the pipe 9 toward the detour pipe 3 of the pipe 8, and if air is accumulated inside the pipe 9, the air is mixed with the water. It moves inside the detour pipe 3 through the upper pipe 4 and is exhausted to the outside (to the atmosphere) by the air valve 5 . In this way, the siphon principle is maintained without the air pooling beyond the diameter of the pipe at hilly locations, e.g. can be supplied to paddy fields, etc.

Although the air valve device according to the embodiments of the present invention has been described above, the present invention is not limited to the above-described embodiments, and may be modified in various ways within the scope of the claims. Design changes are possible.

1 air valve device 2 piping (one piping)
2a Protruding portion of pipe (first pipe) 3 Detour pipe 3a Inner pipe of detour pipe 3b Main body (outer pipe) of detour pipe
31 constricted portion 4 upper pipe 5 air valve 5a small air hole 51 valve box 52 cover body 53 float valve body 6 water stop valve 61 water stop plate 7 air valve device 8 pipe (first pipe)
9 Piping (other piping)
9a Projection of pipe (other pipe) S Water source

The pneumatic valve is connected to one or several of the connected pipes forming it at the required location, such as water supply and sewerage , industrial water pipelines or agricultural water pipelines. The air valve has a function of discharging air (including other gases) mixed in water flowing through the piping to the outside. Pneumatic valves are widely used in various places of need. The air valve has a large volume exhaust (rapid exhaust) function that exhausts a large amount of air that has accumulated in it after piping work, etc., to the outside through a large air hole, and water flows through the piping at normal pressure. It is widely known that a small amount of air that has entered the pipe for various reasons is discharged to the outside through a small air hole (for example, Patent Documents 1 and 2).

Claims (7)

at least one pipe through which water flows;
a detour pipe that is connected to one of the at least one pipes at two points and has a narrowed portion that increases the flow rate of water by gradually narrowing the inner diameter from the upstream side to the downstream side;
an upper pipe connected to the upper part of the detour pipe near the downstream end of the narrowed portion and to the upper part of the other pipe among the one pipe or the at least one pipe;
an air valve connected near the connecting portion of the upper pipe at the upper part of the detour pipe;
An air valve device comprising: The air valve device according to claim 1,
The air valve device, wherein the detour pipe has an inner pipe in a part thereof, and the narrowed portion is formed in the inner pipe. In the air valve device according to claim 2,
The air valve device, wherein the connecting portion of the upper pipe at the upper portion of the detour pipe is provided above the outer surface of the inner pipe. In the air valve device according to any one of claims 1 to 3,
The air valve device, wherein the air valve is connected downstream of the connecting portion of the upper pipe above the detour pipe. In the air valve device according to any one of claims 1 to 4,
The detour pipe is an air valve device connected to the one pipe at the two lower portions. In the air valve device according to any one of claims 1 to 5,
The air valve device, wherein, of the at least one pipe, the pipe to which the upper pipe is connected protrudes upward around a connection portion of the upper pipe in the upper part thereof. In the air valve device according to any one of claims 1 to 6,
The air valve device, wherein the detour pipe is provided with water stop valves upstream and downstream of a region including the connecting portion of the upper pipe and the connecting portion of the air valve.

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