High-performance magnetic liquid sealing structure

Abstract

The invention discloses a high-performance magnetic liquid sealing structure, and belongs to magnetic liquid rotary sealing. The high-performance magnetic liquid sealing structure is suitable for conveying high-pressure medium gas at high speed. The sealing structure is composed of a magnetic conductive shaft, a first pole shoe, a second pole shoe, a third pole shoe, a permanent magnet, a sealing seat, an outer hexagonal bolt, a gland, a comb tooth sealing shell, a rolling bearing, a locking thread cover, an inner sleeve shell, an inner gland, a sealing ring and the like. When the pressure of sealed medium gas is high, a magnetic liquid seal needs to be set in multiple stages, thus the space structure is greatly limited, and the defect that the space size of the magnetic liquid seal is limited is overcome. A comb tooth seal is added to the rear end of the magnetic liquid seal, high-pressure air is introduced into a cavity of the comb tooth seal, air pressure balance between the cavity of the comb tooth seal and the interior of a medium end cavity is achieved, the sealing medium is fully sealed, and the sealing space size is saved.

Description

technical field [0001] The invention belongs to the field of construction machinery rotary seals, in particular to a high-performance magnetic liquid seal structure. Background technique [0002] The high-performance magnetic liquid sealing device is suitable for the sealing of conveying medium gas in the fields of petroleum, chemical industry, mining, machinery, metallurgy, aviation, aerospace, military industry, etc. It is widely used because of its small size and good sealing performance. The traditional seal adopts labyrinth seal , suitable for conveying nitrogen, water vapor, air and other low-pressure medium gases that do not pollute the environment. It cannot be used for conveying toxic and harmful high-pressure medium gases, because the non-contact labyrinth seal is formed between the rotating part and the fixed part. The tortuous gap is sealed by the continuous contraction and expansion of the airflow. Although the structure is simple, the tortuous gap only increase...

AI Technical Summary

Problems solved by technology

[0002] The high-performance magnetic liquid sealing device is suitable for the sealing of conveying medium gas in the fields of petroleum, chemical industry, mining, machinery, metallurgy, aviation, aerospace, military industry, etc. It is widely used because of its small size and good sealing performance. The traditional seal adopts labyrinth seal , suitable for conveying nitrogen, water vapor, air and other low-pressure medium gases that do not pollute the environment. It cannot be used for conveying toxic and harmful high-pressure medium gases, because the non-contact labyrinth seal is formed between the rotating part and the fixed part. The tortuous gap is sealed by the continuous contraction and expansion of the airflow. Although the structure is simple, the tortuous gap only increases the flow resistance and does not prevent the gas medium from escaping fundamentally. Therefore, it is possible to develop a small volume and non-toxic The sealing device that can completely seal the medium gas has very far-reaching significance

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