JPH0579872B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] This invention is installed in a water supply pipe, and when water is flowing, exhaust air is discharged from the pipe, and when draining water from the pipe, air is supplied into the pipe. This relates to an air valve that discharges air or gas separated from water when the inside of the pipe is pressurized and filled with water. [Prior Art] Conventionally, many technologies have been proposed regarding the above-mentioned air valve. Figure 5 is Jikko Sho 61-216554
This is an air valve disclosed in the publication. In this air valve, a lower opening 52 provided at the lower part of a valve box 51 installed at the upper part of the water supply pipe communicates with the inside of the pipe, and a large air hole 54 is provided in a lid 53 that closes the upper part of the valve box 51. A large air hole valve seat 55 is fixed, and a floating valve body 56 is attached to the large air hole valve seat 55 so as to be movable up and down to open and close the large air hole 54. A small air hole valve seat 58 provided with a small air hole 57 that communicates with the air hole 54 is fixed, and a main valve body 59 that opens and closes the small air hole 57 is attached to one end with a float 60 so that the base end can swing freely. It is configured to be locked to a lever 61 which is pivotally connected to the lever 61. With the above configuration, when water is passed through or drained, the large air hole 54 with a large diameter quickly discharges and supplies a large amount of air to protect the pipe line and pressurize the inside of the pipe line. When the water is full, air and gas separated from the water can be exhausted under pressure by the small air hole 57 with a small diameter, and by the lever action of the lever 61,
It is stated that since the gravity and buoyancy of the float 60 effectively act on the main valve body 59, the volume and weight of the float 60 can be reduced, making it possible to reduce the size and weight of the air valve. [Problems to be Solved by the Invention] In the above conventional air valve, the gravity of the float 60 acts only on the main valve body 59 and on the floating valve body 5.
6, so there is no problem when a large amount of air is supplied or exhausted under pressure. The valve body 56 rises and the large air hole 55
There is a structural weakness in that the large volume exhaust function cannot be achieved by closing the system. Therefore, in order to overcome this, it is necessary to increase the weight of the floating valve body 56 and to increase the size of the float 60 to generate a buoyancy that matches the weight of the floating valve body 56.
This goes against the general demands of the times to make air valves smaller and lighter. SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention aims to provide an air valve that can maintain a large amount of exhaust gas without any problem without increasing the size of the valve. [Means for Solving the Problems] The air valve according to the present invention has a large air hole 6 and a small air hole 7 that pass through an upper lid 5 of a valve box 1 having a lower opening 4 that communicates with a water pipe B. Approach and open,
The composite valve body 10, which is tiltably supported in a cantilever shape with the outside of the large air hole as a fulcrum, is separately biased upward by a leaf spring 21 and a leaf spring 22, and deflects each other while maintaining a slight gap. It consists of two receiving plates 11 and 12 that are freely arranged in series, and an elastic body 13 commonly attached to both receiving plates, and the end of the receiving plate 12 on the small air hole side of the composite valve body 10 The above-mentioned problem was solved by suspending the float 20 and by arranging the separation position of both the receiving plates to correspond approximately to the middle between the large and small air holes. [Function] Figures 1 to 4 show embodiments of the present invention, in which the valve box 1 has a lower opening 4 communicating with the water supply pipe, and the upper part is covered with a sealing lid 5. . A large air hole 6 and a small air hole 7 pass through the lid in close proximity, and the lower end surfaces of each form a large air hole valve seat 8 and a small air hole valve seat 9. The composite valve body 10 that opens and closes both valve seats respectively has a leaf spring 21 as shown in detail in FIG.
Two receiving plates 11 and 12, each of which is separately urged upward by a leaf spring 22, are arranged in series with a slight gap between them, and an elastic body 13 is commonly attached thereto. Therefore, the two receiving plates are connected so that they can be bent freely. The composite valve body 10 is supported in a cantilever shape using the outside of the large air hole 6 as a fulcrum, while the float 20 is suspended from the outside end of the small air hole 7. In addition, since the bent portion of the two receiving plates is located approximately between the large and small air holes, the small air hole has the function of being opened and closed by the composite valve body independently of the large air hole. It is growing. It is preferable that the planar shapes of the receiving plate and the elastic body attached thereon are the same, and it is generally desirable that both be strip-shaped and the width thereof considerably exceeds the diameter of the large air hole. With this configuration, the following effects occur depending on the behavior of the water level within the valve body.

[Massive Exhaust] (Figure 1 → Figure 2) When no water is sent to the water pipe and there is no water in the valve box 1, no buoyancy acts on the float 20, and the composite valve body 10 is moved to the air hole valve seat. Since the gravity of the float is at its maximum, the composite valve body resists the biasing forces 21 and 22 and separates from the air hole valve seats 8 and 9, leaving the air valve fully open. When water starts to flow and the inside of the pipe becomes filled with water, air in the pipe enters the valve box through the lower opening 4, passes through the large air hole 6 and the small air hole 7, and is exhausted to the outside of the valve box in large quantities. . During this mass evacuation, the gravity from the float also acts on the large air hole valve body side, opening the body air hole valve seat 8. When the inside of the pipe becomes full of water and water enters the valve box and the water level inside the valve box rises, the buoyant force acting on the float gradually increases, so that the gravity of the float 20 acting on the composite valve body 10 decreases. As the biasing force from the two leaf springs 21 and 22 gradually decreases, the composite valve body starts to close from the large air valve seat 8, and when the small air hole valve seat 9 further closes, the air valve is fully closed. Then, the elastic body 13 is separately pressed upward from below the valve seats so as to come into close contact with both the air hole valve seats 8 and 9. Furthermore, in addition to this biasing force, a force equal to the product of the differential pressure inside and outside the valve (the differential pressure 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.

[Exhaust under pressure] (Figure 3) When the air valve is fully closed, air and gas separated from the water accumulate at the top of the valve box, and when the water level falls,
Since the buoyant force acting on the float 20 decreases, the gravity of the float acting on the composite valve body 10 increases,
When the pressure force pressing the small air hole valve seat 9 from below is overcome, the contact surface of the elastic body 13 of the composite valve body with the small air hole valve seat 9 bends from the cut between both receiving plates and bends downward. The air and gas accumulated in the upper part of the valve box are evacuated from the small air hole 7 under pressure by opening only the small air hole 7. When the pressure evacuation ends and the water level rises, the float also rises and the elastic body 13 closes the small air hole 7 again.

[Mass air supply]

When draining water from the pipe, the float descends in conjunction with the drop in the water level, and the small air hole 7 and the large air hole 6 are opened in this order, thereby supplying a large amount of air into the pipe. [Example] The details of the example will be explained based on each figure to avoid duplication with the explanation in the previous section. The valve box 1 consists of a lower valve box 2 and an upper valve box 3,
The lower valve box 2 is provided with a lower opening 4 that communicates with the water supply pipe B via the repair valve A, and the upper valve box 3 is fixed with a lid 5 that serves as an upper wall that closes the upper part. The composite valve body 10 is constructed by screwing an integral elastic body 13 to two receiving plates 11 and 12 with bolts and nuts 14, and is supported by two leaf springs that press the receiving plates 11 and 12 from below to above. and are separately energized. A base end 15 having an extended receiving plate 11 is pivotally attached to a bracket 16 fixed to the lid 5 via a pin 17, and a hanging bolt 19 is attached to the end 18.
A float 20 is suspended via. The base ends of the leaf springs 21 and 22 are attached to the mounting members 23 and 2.
4. Guide roller 2 fixed to bracket 16 with bolt nut 25 and inserted onto pin 17
6 guides its elastic deformation. The other end urges the composite valve body 10, and the spring 21 moves the receiving plate 11 toward the large air hole 6 side.
The spring 22 urges the receiving plate 12 toward the small air hole 7 side. In addition, 26 is extrapolated to the pin 17 and the spring 21,
This is a guide roller that guides the elastic deformation of 22. 27 is a stopper that defines the fully open position of the composite valve body 10; 28 is a guide screwed into the upper valve box 3 that guides the elevation of the float 20; 29 is an air hole 7;
8 is a cover that is fixed on top of the valve body 1 to prevent foreign matter from falling into the valve body 1, and has a communication hole 3 formed with a screw hole in the side wall.
0 is set. 31 is a drain hole, 32 is a plug, and 33, 34, and 35 are gaskets. [Effects of the Invention] The air valve according to the present invention continues to work in the direction of opening the large air hole during large volume exhaust, so the air valve is sucked into negative pressure, closing the large air hole and hindering the exhaust function. There is no such possibility. This opens the door to reducing the weight and size of the entire valve by setting the float small, thereby providing benefits in terms of installation work and use. The float 20 is suspended via the hanging bolt 19, and the main body of the float 20 is located inside the lower valve box 2. Even in the closed state, an air layer is formed inside the float upper valve box 3, so the air hole 6 , valve seats 8, 9,
The elastic body 13 does not get wet with water, and there is no risk of pipe water being discharged during exhaust and causing problems such as contaminating the pump chamber. Since the communication hole 30 is fixed above the air holes 6, 7 and formed by a screw hole in the side wall of the cover 29, foreign matter such as dust may adhere to the air holes 6, 7 and the valve seats 8, 9. The water can also be washed by screwing the washing water pipe into the communication hole 30.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the present invention, FIGS. 2 and 3 are longitudinal sectional front views illustrating the function of the same, FIG. 4 is an enlarged sectional view illustrating the main parts of the same, and FIG. FIG. 5 is a longitudinal sectional front view showing the prior art. 1... Valve box, 5... Lid, 6... Large air hole, 7...
...Small air hole, 8...Large air hole valve seat, 9...Small air hole valve seat, 10...Composite valve body, 11...Best plate, 1
2... Reception plate, 13... Elastic body, 20... Float, 21... Leaf spring, 22... Leaf spring.

Claims (1)

[Claims] 1 A large air hole 6 and a small air hole 7 that pass through the upper lid 5 of the valve box 1 having a lower opening 4 communicating with the water supply pipe B are opened close to each other, and can be tilted using the outside of the large air hole as a fulcrum. Composite valve body 1 supported in a cantilevered manner by
0 has two receiving plates 11 and 12 which are separately biased upward by leaf springs 21 and leaf springs 22 and lined up in series so as to be bendable with a slight gap, and which are commonly attached to both receiving plates. The elastic body 13 is made of
An air valve characterized in that a float 20 is suspended at the outer end of the small air hole of the composite valve body 10, and the separation position of both the receiving plates corresponds to approximately the middle between the large and small air holes.