A large-diameter high-vacuum baffle valve mechanism capable of bidirectional sealing

Abstract

The invention relates to a heavy-caliber high-vacuum baffle valve mechanism capable of achieving bidirectional sealing. The heavy-caliber high-vacuum baffle valve mechanism comprises a baffle valve body, a baffle valve element and a valve plate locking mechanism. The baffle valve element and the valve plate locking mechanism are both arranged in a cavity of the baffle valve body. The cavity of thebaffle valve body is a sealed cavity and comprises a valve body side wall. The baffle valve element comprises a valve rod, a framework, a locating wheel and a valve plate. The valve body side wall isa cylindrical barrel for forming the valve cavity. The valve plate is arranged in the valve cavity, and the valve rod is further arranged in the valve cavity. The valve rod is connected with the framework, the framework cooperates with the valve body side wall through the locating wheel, and the valve rod is connected with the valve plate locking mechanism through the framework. The valve plate locking mechanism is arranged on the valve plate. According to the heavy-caliber high-vacuum baffle valve mechanism, under the condition of not increasing the axis thrust of an executer, through the valve plate locking mechanism, reliable bidirectional vacuum sealing can be achieved, and opening and closing can be smooth.

Description

technical field [0001] The invention relates to the technical field of high-vacuum flapper valve devices, in particular to the technical field of a large-diameter high-vacuum flapper valve mechanism capable of bidirectional sealing. Background technique [0002] The high vacuum flapper valve is used to connect or cut off the air flow in the vacuum pipeline, and the valve plate moves up and down through the valve stem to achieve sealing. The working principle of the existing high vacuum flapper valve (pneumatic, electric, hydraulic) is very simple, and the applicable working conditions are very limited, that is, the cylinder pushes the valve plate to move (take the pneumatic vacuum flapper valve as an example), when the valve plate moves to the same When the sealing surfaces on the valve body are attached, vacuum is drawn from the lower part of the valve plate, and the cylinder thrust and the atmospheric pressure on the upper part of the valve plate work together to compress ...

AI Technical Summary

Problems solved by technology

However, when the valve is used in reverse or under special working conditions, the pressure difference force on the valve plate is opposite to the thrust of the cylinder, and it is difficult for the valve to achieve vacuum sealing or smooth opening and closing.

[0003] When encountering the above working conditions, the conventional solution in the past is to increase the bore diameter of the cylinder or increase the pressure of the compressed air of the cylinder, but when the valve diameter is large or the pressure of the lower part of the valve plate is high, these methods still cannot solve the problem of valve failure. Problems with two-way vacuum seal or smooth opening and closing

Using the existing conventional method, the large diameter of the cylinder causes the overall structure of the valve to be huge. To increase the compressed air pressure, a special air source and a special cylinder are required, and the diameter of the valve stem is doubled, which increases the cost of processing and use. But even so, If the valve diameter is large or the pressure difference on both sides of the valve plate becomes large, it still cannot meet the two-way sealing requirements of the valve.

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