CN103591368A - Anti-return-air automatic exhaust valve - Google Patents

Abstract

The present invention is an anti-return air automatic exhaust valve. Its valve body and bonnet are integrally connected through threads, the lower end of the valve body is connected with a pipe interface connected with the system, and the bonnet is equipped with an upper cover and an exhaust port; There is a floating ball inside the valve body that can change position with the water level. The floating ball is connected with the lower thimble and the upper thimble through the connecting rod; the lower thimble and the upper thimble are fixed with flexible rubber pads, and the upper and lower ends of the vent hole in the center of the bonnet are also tapered. , which is convenient to seal with the upper and lower thimbles, which are respectively installed on the upper and lower sides of the vent hole; the valve body and the bonnet are sealed by a gasket. Both sides of the air hole are tapered to facilitate airtight sealing with the thimble; the upper thimble is connected to the connecting rod through threads, and the distance between the thimble and the air hole can be adjusted. The exhaust valve has smooth exhaust, good sealing performance, long service life and flexible opening and closing.

Description

Anti back air automatic exhaust valve

technical field

The present invention relates to the technical field of heating and air conditioning systems. It is suitable to be installed at the height of the building's hot water heating system or air conditioning system. It can automatically remove the gas in the system and prevent the outside air from entering the system. the

Background technique

A basic method of the automatic exhaust valve in the prior art is that an exhaust device connected with a floating ball is installed inside the valve body. The device opens the vent hole to exhaust air. After the exhaust is completed, the water level in the valve rises, and the floating ball drives the upper and lower exhaust valves on the exhaust device to close. However, due to sealing and transmission reasons, it often occurs that there is no exhaust, the exhaust port cannot be closed and water leaks. When the system loses water and negative pressure, the atmosphere enters the system through the exhaust valve, resulting in poor water supply, flooding, severe water loss, and pipeline corrosion. harm. the

Contents of the invention

In view of the problems raised above, the purpose of the present invention is to provide an anti-return air automatic exhaust valve with small volume, reliable function and preventing air sucking back. The purpose is to solve the defects of the original automatic exhaust valve and improve the system efficiency , to achieve energy-saving effect. the

Technical solution: the present invention is achieved through the following technical solutions:

The main structure of this anti-return air automatic exhaust valve is that the valve body 1 and the valve cap 2 are connected as a whole through threads. The lower end of the valve body 1 is connected with a pipe interface 5 connected to the system, and the valve cap 2 is equipped with an upper cover 3 and an exhaust port 4; inside the valve body, there is a floating ball 6 that can change its position with the water level, and the floating ball 6 passes through the connecting rod 8 The lower thimble 7 and the upper thimble 9 are connected; the lower thimble 7 and the upper thimble 9 are fixed with flexible rubber pads, and the upper and lower end surfaces of the air hole at the center of the valve cap 2 are also made into a tapered shape, which is convenient to seal with the upper thimble 9 and the lower thimble 7. The lower thimble 7 and the upper thimble 9 are respectively installed on the upper and lower sides of the vent hole; the valve body 1 and the valve cap 2 are sealed by a gasket 10 . Its special feature is that there are two thimbles on both sides of the vent hole, that is, the lower thimble 7 and the upper thimble 9; both sides of the vent hole are tapered to facilitate sealing with the thimble; Connected, the distance between the thimble and the air hole can be adjusted.

The advantage of the anti-return air automatic exhaust valve of the present invention is:

(1) Simple structure, few moving parts, low failure rate and long service life.

(2) It can effectively prevent gas return, reduce water loss, and reduce oxygen corrosion of pipelines and equipment. the

(3) Sealing gaskets are provided at the parts where the valve body interface needs to be tight, which can ensure the assembly quality and sealing performance. the

(4) Reliable work, small size, no air intake under negative pressure, and can be widely used in liquid systems without special requirements. the

Description of drawings

Fig. 1 is a structural schematic diagram of an anti-backgas automatic exhaust valve. the

Detailed ways

In the present invention in use, its pipe interface 5 is connected with the highest point of the heating or air-conditioning water system. When there is no gas in the system, water enters the valve body 1 to make the floating ball 6 float, driving the lower thimble 7 and the upper The float mechanism including the thimble 9 and the connecting rod 8 rises together, and the lower thimble 7 withstands the lower side of the air hole in the center of the valve cap 2. Since the lower thimble 7 is fixed with a flexible rubber pad, which cooperates with the tapered air hole, it plays a role. Reliable sealing action. When the gas is separated in the system, the gas gathers in the valve body 1 of the exhaust valve, causing the water level in the valve body 1 and the float mechanism to drop, the lower thimble 7 is separated from the vent hole, and the vent hole is opened, and the gas passes through the vent hole and the exhaust port 4 Vent to atmosphere. When negative pressure occurs in the system, the float mechanism falls, and the upper thimble 9 falls into the upper side of the vent hole. Since the upper thimble 9 is fixed with a flexible rubber pad, the vent hole can be sealed under the action of gravity and atmospheric pressure, and the atmosphere is blocked. Insulation prevents air from entering the system from the invention. In this way, the present invention not only plays the role of reliable exhaust, but also prevents air from entering the system, effectively controls the water loss of the system, and reduces the corrosion of air to pipeline systems and equipment. the

Claims (2)

1. An anti-return air automatic exhaust valve, which is characterized in that: the valve body (1) and the valve cap (2) are connected as a whole through threads, and the lower end of the valve body (1) is connected with a pipe interface connected to the system ( 5), the bonnet (2) is equipped with an upper cover (3) and an exhaust port (4); there is a floating ball (6) inside the valve body that can change position with the water level, and the floating ball (6) passes through the connecting rod (8) The lower thimble (7) and the upper thimble (9) are connected; the lower thimble (7) and the upper thimble (9) are fixed with flexible rubber pads, and the upper and lower ends of the air hole in the center of the valve cap (2) are also tapered, which is convenient It is sealed with the upper thimble (9) and the lower thimble (7), and the lower thimble (7) and the upper thimble (9) are respectively installed on the upper and lower sides of the vent hole; between the valve body (1) and the bonnet (2) Seal with gasket (10). 2. The anti-return air automatic exhaust valve according to claim 1, characterized in that: both sides of the vent hole are tapered to facilitate sealing with the thimble; the upper thimble (9) is threaded with the connecting rod (8) Connected, the distance between the thimble and the air hole can be adjusted.

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