Comprehensive sealing structure of screw pump

Abstract

The invention provides a comprehensive sealing structure of a screw pump, and belongs to the technical field of the screw pump. The invention solves the problem of poor sealing effect of an existing screw pump. The screw pump comprises a pump body and a sealing cover fixedly connected to one end of the pump body; a screw is arranged in the pump body, and a rotating shaft of the screw extends into a balance cavity inside the sealing cover; a high-pressure air outlet communicated with an inner cavity of the pump body is formed in the sealing cover; the sealing structure comprises a balance hole formed in the sealing cover and a spiral sealing passage formed between the rotating shaft and the sealing cover; the balance hole communicates the high-pressure air outlet with the balance cavity; and the spiral direction of the sealing passage is opposite to the spiral direction of a spiral part of the screw. The comprehensive sealing structure of the screw pump has the advantage of good sealing effect.

Description

technical field [0001] The invention belongs to the technical field of screw pumps, and relates to a comprehensive sealing structure of a screw pump. Background technique [0002] The screw pump is to place the screw in the pump body, and rely on the volume change of the sealed cavity formed by the screw and the bushing to inhale and discharge the medium. [0003] Existing screw pumps, such as Chinese patent documents disclose a dry-type twin-screw compressor [application number: 201822270955.5; authorization announcement number: CN209354352U], including a pump body, a sealing cover and a gear cover. The two meshing rotors, the sealing cover is arranged between the pump body and the gear cover, the gear cover is externally connected with a booster pipe that can maintain the pressure balance between the pump body and the gear cover, and the sealing cover is provided with the pump body and the gear cover. Separated seal assemblies. [0004] In the twin-screw compressor of th...

AI Technical Summary

Problems solved by technology

However, in the twin-screw compressor with this structure, the normal-pressure gas continuously enters the pump body from the normal-pressure air inlet, and the rotor rotates to squeeze the gas and the gas is affected by heat exchange, so that the normal-pressure gas becomes a high-pressure gas. The gas is discharged from the high-pressure gas outlet, and part of the high-pressure gas in the pump body will enter the balance chamber through the gap between the rotor shaft and the sealing cover. When the gas pressure in the balance chamber is greater than the set value, the high-pressure gas in the balance chamber will It will flow to the atmospheric air inlet of the pump body again through the pressure relief pipeline and the one-way valve, that is, this part of the high-pressure gas in the balance chamber cannot play a role. Pipeline input nitrogen

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