JPH074545A - Exhaust valve - Google Patents

Abstract

PURPOSE:To obtain an exhaust valve which can open and close an optional exhaust valve port among low and high pressure ones, and does not discharge water with a simple structure. CONSTITUTION:An inflow port 1, a valve chamber 5, and an exhaust port 3 are formed by valve casings 2, 4, 6. A valve seat member 11 on which a communication port 12 are opened for communicating the valve chamber 5 with the exhaust port 3 is arranged on the valve casing 4. A cylindrical exhaust valve body 13 is slidably arranged inside the communication port 12. A float 21 is provided on a lower side of the exhaust valve body 13. The upper side of the valve body 13 is slidably arranged inside a port 19 formed on the valve casing 4. A through-hole 15 is formed inside the exhaust valve body 13 for the communication of the valve chamber 5 and the port 19, respectively through a port 16 and a port 20. A cylindrical wall 17 is arranged around the port 16. An exhaust valve port 23 is communicated with the exhaust port 3 of an exhaust valve body 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust valve for automatically discharging only air mixed in a water pipe, and particularly, to open a valve opening of a required size under any pressure condition. And what can be exhausted.

Usually, an exhaust valve is called an initial rapid exhaust valve that opens an exhaust valve port to discharge a large amount of low-pressure air only when water is initially supplied to a water pipe. There are two types of so-called automatic exhaust valves that close when water comes in.

[0003]

2. Description of the Related Art A conventional exhaust valve is, for example,
The one disclosed in Japanese Patent No. 54380 was used. This is to open and close the large valve opening and the small valve opening at the same time by the float and lever mechanism.The large valve opening functions as an initial rapid exhaust valve that discharges a large amount of initial air. It functions as an automatic exhaust valve that opens when air comes in at the valve opening.

[0004]

SUMMARY OF THE INVENTION In the above conventional one,
The two functions of the initial rapid exhaust valve and the automatic exhaust valve can be achieved by a single valve, but there is a problem that the structure becomes complicated because it requires a float, a lever, and two large and small valve openings. It was

Further, in the above-mentioned conventional type, there is a problem that the valve opening area of the small valve opening when functioning as an automatic exhaust valve is small, so that when a large amount of air has flowed in, it cannot be exhausted. This is because the area of the valve opening that can be opened by the float having a constant buoyancy and gravity is determined by the pressure difference before and after the valve opening, and cannot be opened by a pressure difference larger than that.

Further, in the above-mentioned conventional apparatus, when a mixed fluid of water and air is vigorously flowing in from the inlet, not only the air but also a part of the water which should not be discharged is discharged from the valve opening, and exhausted. There was a problem that the area around the valve was polluted by the discharged water.

Therefore, the technical problem of the present invention is that a simple structure fulfills the functions of both sides of the initial rapid exhaust valve and the automatic exhaust valve, and a large amount of air can be exhausted under any pressure condition. At the same time, it is to obtain an exhaust valve that can reliably prevent the discharge of water.

[0008]

The technical means of the present invention taken to solve the above technical problems is to form a valve chamber by valve casing, and have an inflow port in the lower part of the valve chamber in the upper part. An exhaust port is provided, and a valve seat member having a communication hole for communicating both the exhaust port and the valve chamber is attached, and a cylindrical exhaust valve body is slidably arranged in the communication hole. A float is attached directly or indirectly to the valve chamber part of the body, a through hole is formed in the exhaust valve body, one of the through holes is opened in the valve chamber above the float, and the other is on the outlet side. An opening is formed in the hole formed in the valve casing, and a cylindrical wall is fixedly attached to the float around one opening in the upper part of the float. -An exhaust valve hole that communicates with the through hole is provided at a position that communicates with the exhaust port when the float descends and communicates with the hole when the float rises. Than it is.

[0009]

The operation of the above technical means is as follows.
When the water level in the valve chamber is low and the float is descending, the exhaust valve hole provided in the tubular valve element is in a position communicating with the exhaust port,
The air flowing into the valve chamber through the inflow port is discharged from the exhaust port through the opening in the valve chamber, the through hole, and the exhaust valve hole. When water flows from the inlet into the valve chamber, the float rises due to its buoyancy. As the float rises, the cylindrical exhaust valve body also rises, and the exhaust valve hole provided in the exhaust valve body communicates with the hole, so it does not communicate with the exhaust port and prevents water discharge. At the same time, the discharge of air is stopped. When air again flows into the valve chamber and the water level drops, the float also drops, and the exhaust valve hole communicates with the exhaust port again to discharge air.
This operation is repeated depending on the water level in the valve chamber.

By providing a through hole in the exhaust valve body, one of which is opened in the valve chamber and the other of which is opened in a hole formed in the outlet side valve casing, the inside of the exhaust valve body is increased when the float is raised. Since the pressure in the valve chamber acts on the outlet side as well, a pressure difference corresponding to the pressure difference between the valve chamber pressure and the outlet side does not occur in the exhaust valve body, so that no matter what the pressure state from low pressure to high pressure, With a small float buoyancy, a large exhaust valve hole can be opened, and a large amount of air can be discharged.

By arranging the cylindrical wall around one opening in the upper part of the float, even if the mixed fluid of water and air is vigorously flowing into the valve chamber through the inlet, the water can be circulated in one opening by the cylindrical wall. It is prevented from flowing into the inside, so that no water is discharged to the outside through the exhaust port.

[0012]

EXAMPLE An example showing a concrete example of the above technical means will be described (see FIG. 1). A lower body 2 having an inflow port 1,
A valve casing is configured by an upper body 4 having an exhaust port 3 and a cylindrical body 6 that forms a valve chamber 5 with the upper and lower bodies 2, 4. The lower body 2 is provided with a wall 7 that separates from the valve chamber 5, and the wall 7 has an inlet 1
And a plurality of holes 8 and 9 communicating with the valve chamber 5.

A valve seat member 11 is screwed to the upper part of the valve chamber 5 and the center of the lower part of the upper body 4 via a gasket 10. A communication hole 12 that communicates the valve chamber 5 and the exhaust port 3 is formed in the center of the valve seat member 11, and a long and long cylindrical exhaust valve body 13 is slidably slidable in the communication hole 12 in a sliding ring 30. Place through. Therefore, the inner diameter of the communication hole 12 is made slightly larger than the outer diameter of the exhaust valve body 13.

A through hole 15 is formed in the exhaust valve body 13, one of which is opened in the valve chamber 5 through a hole 16, and the other of which is formed in a hole portion 19 provided in the upper body 4 and has an upper end hole 20. Open through. A hollow spherical float 21 is attached to the inside of the valve chamber 5 of the exhaust valve body 13 by welding. Around the hole 16, a cylindrical wall 17 having an open upper end is attached to the upper portion of the float 21 by welding. A synthetic rubber seal ring 18 which is in contact with the lower end surface of the valve seat member 11 and seals the communication hole 12 in an airtight manner is attached to the entire circumference of the upper end of the cylindrical wall 17. Also, the cylindrical wall 17
An orifice hole 25 is provided in the lower part of the. The lower end portion 22 of the exhaust valve body 13 is placed on the wall 7 of the lower body 2.

In order to allow the exhaust valve body 13 to slide also in the hole portion 19 of the upper body 4, the inner diameter thereof is made slightly larger than the outer diameter of the exhaust valve body 13 and the sliding ring 31 is arranged. As shown in FIG. 1, when the float 21 is descending, an exhaust valve hole 23 is provided at a position communicating with the exhaust port 3. The exhaust valve hole 23 communicates with the through hole 15 and is provided at a position located inside the hole portion 19 when the float 21 rises. The size, shape, and number of the exhaust valve holes 23 can be appropriately selected from a circular shape, a rectangular shape, a fan shape, or the like according to the exhaust flow rate characteristics of the exhaust valve.

Next, the operation will be described. The exhaust valve connects the inflow port 1 to a water pipe (not shown) and automatically discharges only the air in the water pipe. As shown in FIG. 1, the float 21 in the valve chamber 5 is lowered. In this case, the exhaust valve body 13 is located on the wall 7, and the exhaust valve hole 23 communicates with the exhaust port 3.
Therefore, the air flowing in from the inflow port 1 is exhausted from the exhaust port 3 through the holes 8 and 9, the hole 16, the through hole 15, and the exhaust valve hole 23.

When water flows into the valve chamber 5 from the inlet 1, the water level in the valve chamber 5 rises and the float 21 also rises due to its buoyancy. Exhaust valve body 1 as the float 21 rises
3 also rises, and the exhaust valve hole 23 is located in the hole portion 19,
The exhaust valve hole 23 is closed by the hole portion 19,
The discharge of water to the exhaust port 3 is prevented, and the discharge of air is stopped.

When the float 21 rises, the hole portion 19 of the upper body 4 communicates with the valve chamber 5 through the hole 20, the through hole 15, the hole 16 and the orifice hole 25, and the inside of the hole portion 19 Is equal to the pressure inside the valve chamber 5. Therefore, when the exhaust valve body 13 moves downward, the pressure difference corresponding to the pressure difference between the valve chamber 5 internal pressure and the exhaust port 3 pressure does not act, and the valve chamber 5 internal pressure, that is, the inlet 1 side Regardless of the pressure from low pressure to high pressure, the exhaust valve hole 23 can be opened and closed by a constant float buoyancy.

Even if the mixed fluid of water and air is vigorously flowing in from the inflow port 1, a cylindrical wall 17 is arranged around one hole 16 leading to the exhaust port 3 to allow the mixed fluid to flow through the hole 16.
It is possible to prevent water from passing through the exhaust port 3 to prevent water from being discharged. In this embodiment, the cylindrical wall 17
Although the entire upper end of the above is opened, it is possible to cover a part of the upper end with a small gap left.

In this embodiment, an example in which the float 21 is directly attached to the exhaust valve body 13 has been shown, but the float has a lever-float structure and is opposite to the lever's float. The exhaust valve body 13 may be connected to the side portion.

[0021]

The present invention produces the following unique effects. With a simple structure consisting of a cylindrical exhaust valve and a float, it is possible to open a large exhaust valve hole regardless of the pressure difference from low pressure to high pressure. The two functions of the exhaust valve can be fulfilled by one valve, and it is possible to prevent water from being discharged from the exhaust port, and it is possible to prevent contamination by the discharged water.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of an exhaust valve of the present invention.

[Explanation of symbols]

 1 Inlet 3 Exhaust Outlet 5 Valve Chamber 11 Valve Seat Member 12 Communication Hole 13 Exhaust Valve Disc 15 Through Hole 17 Cylindrical Wall 19 Hole 21 Float 23 Exhaust Valve Hole

Claims (1)

[Claims] 1. A valve seat in which a valve chamber is formed by valve casing, an inflow port is provided at a lower part of the valve chamber, an exhaust port is provided at an upper part thereof, and a communication hole is formed between the exhaust port and the valve chamber to communicate the two. A member is attached, a cylindrical exhaust valve body is slidably arranged in the communication hole, and a float is directly or indirectly attached to the valve chamber portion of the exhaust valve body, and a through hole is formed in the exhaust valve body. And one of the through holes is opened in the valve chamber in the upper part of the float, and the other is opened in the hole formed in the valve casing on the outlet side, and a cylinder is formed around one opening in the upper part of the float. The wall is fixedly attached to the float, and the through hole is located on the side of the exhaust valve body so as to communicate with the exhaust port when the float descends and communicate with the hole when the float rises. An exhaust valve having an exhaust valve hole communicating with the exhaust valve.