Magnetic liquid sealing device

Abstract

The invention discloses a magnetic liquid sealing device. The magnetic liquid sealing device comprises a shell, a rotating shaft, a plurality of shaft sleeves and a plurality of pole shoes; a cavity is formed in the shell; the rotating shaft is rotatably arranged in the cavity; the shaft sleeves are sleeved on the rotating shaft so as to rotate along with the rotating shaft; the plurality of shaft sleeves are arranged at intervals in the axial direction of the rotating shaft; the pole shoes are sleeved outside the shaft sleeves; the plurality of pole shoes are in one-to-one correspondence with the plurality of shaft sleeves; the inner circumferential surfaces of the pole shoes and the outer circumferential surfaces of the shaft sleeves are spaced in the radial direction of the rotating shaft to form sealing gaps; and magnetic liquid is arranged in the sealing gaps. The magnetic liquid sealing device has the advantages of being compact in structure and high in reliability.

Description

technical field [0001] The invention relates to the technical field of mechanical engineering sealing, in particular to a magnetic liquid sealing device. Background technique [0002] At present, when magnetic liquid seals are used, under the working conditions of small axial dimensions or large radial dimensions, the existing magnetic liquid sealing devices cannot meet the design requirements due to size limitations, resulting in insufficient pressure resistance of the magnetic liquid sealing devices, thus Problems leading to seal failure. [0003] The permanent magnet in the magnetic liquid sealing device is magnetized in the axial direction, and the end face is the magnetic pole of the permanent magnet. The pole piece and the permanent magnet are distributed along the axial direction, and the axial size is relatively large; this structure and with the increase of the sealing diameter, the corresponding size The permanent magnets are also more and more difficult to proces...

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Problems solved by technology

[0002] At present, when magnetic liquid seals are used, under the working conditions of small axial dimensions or large radial dimensions, the existing magnetic liquid sealing devices cannot meet the design requirements due to size limitations, resulting in insufficient pressure resistance of the magnetic liquid sealing devices, thus Problems that lead to seal failure

[0003] The permanent magnet in the magnetic liquid sealing device is magnetized in the axial direction, and the end face is the magnetic pole of the permanent magnet. The pole shoe and the permanent magnet are distributed along the axial direction, and the axial size is relatively large; this structure and with the increase of the sealing diameter, the corresponding size The permanent magnets are becoming more and more difficult to process, these factors seriously limit the application range of magnetic liquid rotary seals

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