an airtight valve

Abstract

The invention provides an airtight valve. The airtight valve comprises a valve body unit, a valve shaft unit, an actuation mechanism unit, a valve flap unit and a moving unit, wherein the valve body unit is composed of a valve body, rubber sealing gaskets and a stop block device; the valve shaft unit is composed of an internal shaft and an external shaft that partially sleeves the internal shaft, and the contact surface between the internal shaft and the valve body is provided with a sealing component; the actuation mechanism unit is arranged on the valve body and connected with the internal shaft to drive the internal shaft to rotate; the valve flap unit is composed of a first valve flap, a second valve flap and a spring arranged between the first valve flap and the second valve flap; the moving unit is arranged inside a valve flap cavity formed between the first valve flap and the second valve flap and composed of a crank shaft fixedly connected with the internal shaft, a connecting rod movably connected with the crank shaft, and a slider fixedly connected with the valve flaps. The airtight valve adopts a sealing mode involving two valve flaps and two rubber sealing gaskets, so that breakage of a single valve flap or rubber sealing gasket has no influence on the utilization of the valve, and the product reliability can be greatly enhanced.

Description

technical field [0001] The invention relates to the field of valves, in particular to an airtight valve. Background technique [0002] Existing airtight valves generally adopt a sealing method of sealing a single valve disc and a valve body. Once a problem occurs with the valve disc, the airtight valve will not work normally. The rubber gasket between the single disc and the valve body is sealed. Once the rubber gasket is damaged, it will also fail to seal. When the existing airtight valve is sealed, the rubber pad is subjected to the shearing force of the valve disc and the valve body, and the shearing stress cannot be too large, otherwise the sealing pad will be damaged, which will inevitably leave a small gap, so that it cannot be truly sealed. Zero leakage to gas. [0003] Therefore, it is necessary to make further improvements to the prior art. Contents of the invention [0004] The purpose of the present invention is to overcome the defects of the prior art and pr...

AI Technical Summary

Problems solved by technology

[0002] Existing airtight valves usually adopt a sealing method between a single valve disc and the valve body. Once there is a problem with the valve disc, the airtight valve will not work normally.

The rubber gasket between the single disc and the valve body is sealed. Once the rubber gasket is damaged, it will also fail to seal.

When the existing airtight valve is sealed, the rubber pad is subjected to the shearing force of the disc and the valve body, and the shearing stress cannot be too large, otherwise the sealing pad will be damaged, which will inevitably leave a small gap, so that it cannot be truly sealed. Zero leakage to gas

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