Magnetic liquid sealing device with pole shoes being provided with high teeth and low teeth

Abstract

A magnetic liquid sealing device with pole shoes being provided with high teeth and low teeth. Positioning rings (5), left bearings (6), left magnetic separation rings (7), magnetic liquid sealing assemblies, right magnetic separation rings (13) and right bearings (14) are sequentially arrayed in outer covers (1). After magnetic liquid (17) is injected into inner rings of magnets (10), shaft sleeves (3) are arranged in inner holes of the above parts, then screws (20) are used for fixing end covers (18) on the outer covers (1), the outer circles of the right bearings (14) are compressed, and the end covers (18) and the shaft sleeves (3) are connected by screws (19). The characteristic that pole teeth are arranged on a common magnetic liquid sealing upper pole shoe is utilized, and pole teeth which are originally arranged on a magnetic liquid seal are replaced by high teeth in a labyrinth seal. The magnetic liquid sealing device with the pole shoes being provided with the high teeth and the low teeth is simple in structure, the impact resistance of the magnetic liquid seal is improved, and the magnetic liquid seal is made to be used in certain the severe proof pressure environments where pressure can be increased suddenly and sharply.

Description

technical field [0001] The invention relates to a magnetic liquid sealing device with high and low teeth on pole pieces, belongs to the field of mechanical sealing, and is especially suitable for sealing of toxic and harmful gas media with large pressure fluctuations of the sealing medium. Background technique [0002] At present, most of the seals used on blowers are traditional seals such as labyrinth seals, but labyrinth seals have the problem of large leakage, and labyrinth seals should not be used when the sealing medium is flammable and explosive gases. The magnetic liquid seal has the advantages of simple structure, zero leakage, and long life. However, the magnetic liquid seal device described in Document 1 (the patent with the publication number of CN 101799075A) has no impact resistance. When the ultimate pressure resistance value of the magnetic liquid seal is exceeded, the magnetic liquid seal will fail, and the sealing medium will leak a lot, which will cause gr...

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Problems solved by technology

[0002] At present, most of the seals used on blowers are traditional seals such as labyrinth seals, but labyrinth seals have the problem of large leakage, and labyrinth seals should not be used when the sealing medium is flammable and explosive gases.

The magnetic liquid seal has the advantages of simple structure, zero leakage, and long life. However, the magnetic liquid seal device described in Document 1 (the patent with the publication number of CN 101799075A) has no impact resistance. When the ultimate pressure resistance value of the magnetic liquid seal is exceeded, the magnetic liquid seal will fail, and the sealing medium will leak a lot, which will cause great harm to the human body and the environment; Document 2 (the patent with the publication number of CN103115152 A) introduces a magnetic liquid and a labyrinth The alternating combination seal is mainly for the condition of the stepped shaft, and the labyrinth space formed simply by the pole piece, the magnet and the stepped shaft is not the proportional parameter of the traditional tooth shape design of the labyrinth seal, so the throttling performance of the labyrinth is not good. And if the invention adopts 4-6 labyrinth series, it will not only put forward high requirements for the machining of the stepped shaft, but also greatly increase the axial length of the entire sealing device

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