JPH0643440U - Exhaust valve for sewage - Google Patents

Abstract

(57) [Summary] [Structure] Large air holes 2 communicating with the outside of the ceiling of the valve box 1
And the valve body 6 for opening and closing the large air hole 2 is provided in conjunction with the float 9. An exhaust chamber cover 21 is detachably provided on the upper side of the valve box 1 so as to cover the large air hole 2. Exhaust chamber cover 2
1, an exhaust hole 22 communicating with the outside is formed, and a check valve device 23 that blocks the inflow of air into the exhaust chamber cover 21 is provided in the exhaust hole 22. [Effect] When the exhaust valve tries to perform the intake action, the check valve device 23 maintains the closed state, so that the intake of air into the valve box 1 and the pipeline can be blocked. By making the exhaust chamber cover 21 attachable / detachable to / from the valve box 1, it is possible to select whether or not the intake action is required after the exhaust valve is installed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sewage exhaust valve that discharges air in a sewage pipe to the outside of the system.

[0002]

[Prior art]

 The conventional exhaust valve is, for example, as shown in FIG. In FIG. 3, the lower end of the valve box 1 communicates with the conduit, and a large air hole 2 is formed in the top of the valve box 1. A spring box 3 is arranged above the large air hole 2, and the spring box 3 is fixed to the valve box 1 via a plurality of columns 4. Further, the spring box 3 has a proper gap between it and the valve box 1, and forms a large discharge port 5 that opens along the entire circumference of the bottom peripheral edge.

A valve body 6 that opens and closes the large air hole 2 is arranged inside the valve box 1, and the valve body 6 is fixed to a valve rod 7 that passes through the large air hole 2. The valve rod 7 has a valve rod hole 8 formed at the bottom of the spring box 3 at the upper end thereof, and a float 9 is held at the lower end of the valve rod 7 so that the float 9 can be raised and lowered by a predetermined distance. A vent hole 10 is formed in the valve rod 7 in the axial direction, and the lower end opening of the vent hole 10 is opened and closed by the vertical movement of the float 9.

The spring box 3 has a small discharge port 11 on the peripheral wall thereof, and a diaphragm 12 is provided so as to cover the upper opening of the spring box 3. A pressure chamber cover 14 that forms a pressure chamber 13 is provided above the diaphragm 12, and the upper end of the valve rod 7 is screwed and fixed to the diaphragm 12, and the vent hole 10 of the valve rod 7 is fixed to the pressure chamber. I am communicating with 13. A spring 15 is provided inside the spring box 3 for urging the valve body 6 in the closing direction via a valve rod 7.

[0005]

[Problems to be solved by the device]

 In the above structure, during exhaust, the air inside the valve box 1 is exhausted from the large air hole 2 opened by the lowering of the valve body 6. The discharged air flows out to the outside through the large discharge port 5, the water level inside the valve box 1 rises as the air is discharged, and the valve body 6 is closed by the rise of the float 9 to close the large air hole 2 To block.

However, when the pressure in the pipeline decreases below atmospheric pressure, air is taken into the pipeline from the open large air hole 2 through the valve box 1 and the downstream side of the pipeline. There was a problem that a water hammer was generated when the flow path was suddenly closed.

The present invention solves the above problem, and in the case of a water pipe configuration in which an exhaust valve is installed, if a water hammer or the like is predicted and intake is desired to be avoided, intake can be prevented as necessary. An object is to provide an exhaust valve for sewage that can be used.

[0008]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention is an exhaust valve in which an air hole communicating with the outside is formed in a ceiling portion of a valve box, and a valve body for opening and closing the air hole is provided inside the valve box in association with a float. In the above, the exhaust chamber cover is detachably provided on the upper side of the valve box so that the exhaust chamber cover is provided with an exhaust hole that communicates with the outside, and the exhaust hole covers the air inside the exhaust chamber cover. The check valve device for preventing the inflow is provided.

[0009]

[Action]

 With the above configuration, when air flows into the valve box and the water level in the valve box drops, the valve body opens as the float drops, and the air in the valve box passes through the air holes to cover the exhaust chamber. Spills in. At this time, the check valve device is opened by the pressure of the air in the exhaust chamber cover, allowing the air to flow out through the exhaust hole to the outside. After that, the water level rises as the air in the valve box is discharged, and the valve body closes as the float rises.

On the other hand, when the pressure in the pipeline decreases to atmospheric pressure or less, air is taken into the pipeline through the open air hole, through the valve box. In this case, the negative pressure inside the exhaust chamber cover keeps the check valve device closed, preventing air from flowing into the interior through the exhaust hole. Therefore, it is possible to prevent the intake of air into the valve box and the pipeline to prevent the occurrence of a water hammer in the downstream pipeline.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. The same members as those described above with reference to FIG. 3 are designated by the same reference numerals and the description thereof will be omitted. 1 and 2, an exhaust chamber cover 21 is detachably provided on the upper side of the valve box 1 so as to cover the large air hole 2, the large exhaust port 5, and the small exhaust port 11. An exhaust hole 22 communicating with the outside is formed.

The exhaust chamber cover 21 is provided with a check valve device 23 that opens and closes the exhaust hole 22, and the check valve device 23 blocks the inflow of air into the exhaust chamber cover 21. . The check valve device 23 has a valve plate 25 that moves up and down along a guide 24 standing on the upper part of the exhaust chamber cover 21 to open and close the exhaust hole 22, and a valve plate 25 is provided on the upper surface of the exhaust chamber cover 21. A sealing material 26 that seals with the plate 25 is provided in an annular shape so as to surround the exhaust hole 22.

An outer cover 27 is provided above the exhaust chamber cover 21 via a plurality of fixing bolts 28, and a spring 29 for pressing the valve plate 25 toward the seal member 26 is loosely fitted in the fixing bolt 28. Are provided.

The operation of the above configuration will be described below. At normal times, the fluid flowing from the conduit into the valve box 1 lifts the float 9 and holds the valve body 6 so as to block the large air hole 2. Then, the air flowing with the fluid in the pipe flows into the inside of the valve box 1, and when the water level in the valve box 1 decreases, the valve body 6 opens as the float 9 descends, and the air in the valve box 1 changes. It flows out into the exhaust chamber cover 21 through the large air holes 2.

At this time, the valve plate 25 of the check valve device 23 opens against the biasing force of the spring 29 due to the pressure of the air in the exhaust chamber cover 21, and the air flows out through the exhaust hole 22 to the outside. To do. After that, when the water level rises as the air in the valve box 1 is discharged, the valve body 6 closes as the float 9 rises.

On the other hand, when the pressure in the pipeline decreases below atmospheric pressure, the water level in the valve box 1 decreases and the valve body 6 opens the large air hole 2 and the opened large air hole is opened. Air enters the pipe from 2 through the valve box 1.

In this case, since the inside of the exhaust chamber cover 21 becomes a negative pressure, the valve plate 25 of the check valve device 23 receives its own weight and the urging force of the spring 29 to maintain the closed state. Can be prevented from flowing into the inside of the exhaust chamber cover 21 through the exhaust hole 22, and the intake of air to the valve box 1 and the pipeline can be blocked, and the occurrence of water hammer in the downstream pipeline can be prevented. can do.

Further, since the exhaust chamber cover 21 is detachable from the valve box 1, if it is desired to stop the intake action of the exhaust valve after installing the exhaust valve in the conduit, the check valve device 23 When the exhaust chamber cover 21 with the attached is attached to the valve box 1 and the intake action is desired, the exhaust chamber cover 21 can be removed.

[0019]

[Effect of device]

 As described above, according to the present invention, when the exhaust valve tries to perform the intake action, the check valve device maintains the closed state, so that the air flows into the inside through the exhaust hole. It is possible to prevent the intake of air into the valve box and the pipeline, and by making the exhaust chamber cover detachable from the valve box, it is possible to select whether or not the intake action is required after the exhaust valve is installed. You can

[Brief description of drawings]

FIG. 1 is a sectional view of a sewage exhaust valve according to an embodiment of the present invention.

FIG. 2 is an enlarged view of part A in FIG.

FIG. 3 is a cross-sectional view of a conventional exhaust valve.

[Explanation of symbols]

 1 Valve Box 2 Large Air Hole 6 Valve Body 9 Float 21 Exhaust Chamber Cover 22 Exhaust Hole 23 Check Valve Device 25 Valve Plate 29 Spring

Claims (1)

[Scope of utility model registration request] 1. An exhaust valve in which an air hole communicating with the outside is formed in a ceiling portion of a valve box, and a valve body for opening and closing the air hole is provided inside the valve box in association with a float. A check valve device that covers the air hole and detachably mounts the exhaust chamber cover, forms an exhaust hole communicating with the outside in the exhaust chamber cover, and blocks the inflow of air into the exhaust chamber cover in the exhaust hole. Exhaust valve for sewage characterized by being provided.