JPS591882A - Air valve - Google Patents

Abstract

PURPOSE:To surely operate a valve for high speed exhaust air and a high speed water flow, by mounting a main valve body, moving together with a float and having a valve port opened and closed with the float, to a bottommed guide cylinder provided to a valve case and providing a small hole, opened and closed with the float, to the bottom part of said guide cylinder. CONSTITUTION:A guide cylinder 8 having a semispherical shell bottom part 13 is mounted to the inside of a valve case 1, and a small hole 7 is drilled to the center of this bottom part, then the hole 7 is closed when a float 4 is placed in the bottom. When air inflowing from a connection port 2 is exhausted to a valve port 3 from openings 15, the float 4 is placed by its own weight in a condition as shown in the drawing, and high speed exhaust does not flow into the guide cylinder 8 and a main valve 6 is never lifted, on the contrary, if water goes into the guide cylinder 8, the float 4 is lifted to open the small hole 7, and water jetted from the connection port 2 increases a pressure in the guide cylinder 8, then the main valve 6 is lifted and closed. If air is accumulated in the valve case 1, the float 4 sinks to open a valve port 5 and exhausts air.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air valve for sucking air in a pipe.

Conventionally, as shown in Fig. SK1, a guide tube 8 having a small hole 7 at the bottom is provided in a valve cabinet 1 having a large valve opening 3 formed at the top and connected to a water supply pipe at the bottom. A spherical float 4 that moves up and down according to the water level and a main valve 6 above the float 4
The air inside the water supply pipe is discharged from the large valve port 3, and the valve box 1
Float 4 and main valve 6 rise to the surface as water fills inside the large valve port 3.
There is an air valve that closes the

This thing will not work against high speed exhaust or high speed water flow. The points we have clarified regarding this are described below.

In response to high-speed exhaust flow, the main valve 6 is agitated during exhaust and closes.
This is because the pressure flowing inside pushes up the main valve 6.

In order to solve this problem, the main valve 6 is strongly pushed down due to the high pressure generated by the merging and collision of the small hole water streams, canceling out the buoyancy of the float 4 and making it impossible to close the valve.

Conventionally, as shown in Japanese Patent Laid-Open No. 55-54781, it was thought that the pressure above the main valve 6 would be negative, but the present invention focuses on the fact that the pressure above the main valve 6 is high. be. According to actual measurements, the pressure on one side of the main valve 6 is approximately J♀
Although the pressure is several orders of magnitude lower than that of passage 14, it is much higher than that of passage 14. This turns out to be a common fact for water and air currents.

The air valve of the present invention has the structure shown in the claims above. Therefore, during exhaust, the float 4 closes the hole 7, so the pressure inside the guide tube 8 is low, and the main valve 6 raises the air valve. In addition, since the flows 1-4 are not subjected to the downward force of the main valve 6 when filled with water, they float freely to open the small holes 7 and increase the pressure inside the guide cylinder 8. Therefore, the main valve 6 is reliably pushed up and closed.

To explain with reference to the embodiment shown in FIG. 2, l is a valve box with ry openings at the top and bottom, and the lower end of this valve box 1 has a joint port 2 to the water supply pipe.
is formed, and a gasket 1 is formed around the lower side of the ceiling opening 3 at the upper end.
0 is fixedly attached by valve t11. A cover 12 is fixed to the second part of this valve 11. Inside the valve box 1, there is replaced a guide cylinder 8 whose upper end is open and whose lower end has a two-hemisphere bottom 13. This bottom 1
A small hole 7 of an appropriate size is provided in the center of 3, and when the float 4 is located below, this flow 1-4 flows through the hole 7.
will be closed. Further, the space between the guide tube 8 and the valve box IA is a passage 14 that passes through the connection port 2 and the ceiling 03. That is, an opening 15 communicating with the ceiling opening 3 is provided in the upper part of the guide tube 8.

A floating float 4 is housed in the guide cylinder 8, and a main valve 6 is provided above the float 4. A valve seat 20 with a small valve opening 5 formed in the center of the main valve 6 is installed (- Here, the main valve 6 rests on a protrusion 17 provided on the inner wall of the guide cylinder 8, and when the inside of the valve box 1 is empty and the float 4 is in contact with the bottom part 13, the main valve 6 is Valve 6 and float 4 do not touch each other,
It is moving with a gap of 18.

In such a configuration, when air flowing in from the connection port 2 passes through the vent 14 and the opening 15 and blows from the valve port 3, the float 4 and the main valve 6+ are held under their own weight (in the state shown in the figure). In this case, the small hole 7 is mostly closed by the float 4 and only a small amount leaks out, so the high-speed exhaust flow 4 blowing from the connection port 2 hardly flows into the guide tube 8. Therefore, the pressure inside the guide cylinder 8 hardly increases, so the main valve 6 is not pushed up.Next, the inside of the valve box 1 is filled with water, and the small gap in the small hole 7 closed by the float 4 and the main valve 6 are not pushed up. When water enters the guide tube 8 through the gap between the valve 6 and the valve box 1, the float 4 floats up and the small hole 7 is swept away.Therefore, water flows in from the connection port 2 and blows up. The flow flows into the guide cylinder 8 from the small hole 7, increasing the pressure inside the guide cylinder 8, and the main valve 6 is strongly pushed up and closed. Therefore, even if the high pressure 3 on the main valve 6 is suppressed by the high-speed water flow, the pressing force is not transmitted to the float 4. Therefore, the float 4 floats up without receiving resistance and opens the small hole 7 reliably. Since this 6 is on top of the main valve 6, the pressing force due to the high pressure on the main valve 6 is transmitted to the float 4, and the flow 1-4 cannot float, so the pressure inside the guide cylinder 8 does not increase, and therefore the main valve 6 The high pressure above continues to press the main valve 6, which prevents it from closing and continues to discharge water.

In addition, after the main valve 6 closes the valve port 3, when air mixed into the water flow in the water supply pipe accumulates in the valve box 1, the float 4 descends and opens the /Iλ valve port 5 to exhaust the air. This is the same as the conventional air valve in that the main valve 6 and the float 4 descend to suck air when the inside of the water supply pipe becomes negative pressure.

Returning to the effects of the present invention, since the small hole 7 is provided in the center of the bottom 13 and the main valve 6 is placed on the protrusion 17, the small hole 7 can be opened and closed by the float 4 without resistance. When exhausting water, the small hole 7 is closed, and when filling with water, the small hole 7 is closed. yμ, choose. Therefore, when exhausting water, the pressure inside the guide cylinder 8 becomes low and the main valve 6 is not heated up, and when filling with water, the pressure inside the guide cylinder 8 becomes high and the main valve 6
The valve is closed securely. In other words, an air valve that operates reliably even in high-speed exhaust and high-speed water flow is obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional air valve, and FIG. 2 is a sectional view showing an embodiment of the air valve according to the present invention. 1...Valve box, 2...Connection port, 3...Large valve port, 4...Float, 5...Small valve port, 6...Main valve, 7.../IX hole, 8
...Guide tube, 13.. Bottom of guide tube 8, 17.. Protrusion. Procedural amendment (ka). Director General of the Japan Patent Office from 1981 to Monday 28th 1. Indication of the case Patent Application No. 110428/1980 Clear Edition
2. Title of the invention: 4. Amendment order')] Attachment: September 9, 1982 (Delivery date: September 28, 1980) 5. Complete text of the subject of the amendment CD, books and specifications 9.

Claims (1)

[Claims] A bottomed guide cylinder 8 is provided in a valve box 1 in which a connection port 2 connected to a water supply pipe is formed at the bottom and a large valve port 3 is formed at the top.
In this air valve, a main valve body 6 is provided in the guide tube 8, which moves up and down along with the float 4 according to the water level to open and close the large valve port 3, and also serves as a small valve 05 that is opened and closed by the float 4.
A small hole 77 is provided in the center of the bottom hole 13 of the guide tube 8 so that when the float 4 is located below, the /h hole 7 is closed by the float 4, and the main valve 6 is inserted into the guide tube 8. This air valve is characterized in that it is placed on a protrusion 17 provided so as not to be placed directly on a float 4.