Staggered magnetofluid sealing structure

Abstract

The invention discloses a staggered magnetofluid sealing structure. The staggered magnetofluid sealing structure comprises a hollow shell and a rotary shaft, wherein the rotary shaft and the shell areassembled and connected through a bearing; at least one permanent magnet is assembled on the inner wall of the shell; pole shoes mounted on the inner wall of the shell in a sleeving manner are separately arranged on two side of each permanent magnet, at least two polar teeth are arranged on each pole shoe, and a groove is formed between adjacent two polar teeth; at least one disc-shaped shaft isarranged in the radial direction of the rotary shaft, and the diameter of the disc-shaped shaft is greater than that of the rotary shaft; the outer edge of the at least one disc-shaped shaft is correspondingly inserted into the groove of the pole shoe; a gap X exists between the outer edge surface of the disc-shaped shaft and the inner circumferential surface of the groove, and a magnetofluid is injected to the gap X; a gap exists between the polar teeth and the outer circumferential surface of the rotary shaft, and a magnetofluid is injected to the gap Y. By arranging the structure in a staggered manner, the magnetofluid can be blocked well, so that the loss of the magnetofluid is reduced greatly. Meanwhile, the self-repairing ability of the sealing structure is increased, so that the pressure resistance and sealing property of magnetofluid sealing are improved.

Description

technical field [0001] The invention belongs to sealing technology, in particular to a staggered magnetic fluid sealing structure. Background technique [0002] The magnetic fluid seal has the advantages of no solid friction between the seals, long service life of the seals, and zero leakage. [0003] The existing magnetic fluid sealing structure generally includes a housing with a hollow cavity, a rotating shaft, a permanent magnet and a pole shoe are arranged between the rotating shaft and the housing for magnetic fluid sealing, and the inner ring of the pole shoe is provided with pole teeth. [0004] This structure mainly has the following defects: [0005] 1. On the outer surface of the rotating shaft, the area where the magnetic fluid is sealed is the optical axis section. Once the magnetic fluid leaks, it will cause complete leakage and the seal will fail. [0006] 2. If a single-stage seal is used, the magnetic supply capacity is weak, the magnetic sealing performan...

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Problems solved by technology

[0005] 1. On the outer surface of the rotating shaft, the area where the magnetic fluid is sealed is the optical axis section. Once the magnetic fluid leaks, it will cause a complete leak and the seal will fail

[0006] 2. If a single-stage seal is used, the magnetic supply capacity is weak, the magnetic sealing performance is poor, and it is difficult to meet the requirements of vacuum sealing; if a multi-stage seal is used, the sealing performance can be improved, but the effect is not obvious, and it cannot reach high speed, etc. The needs of the occasion, the scope of application is narrow

Moreover, the use of multi-stage sealing will make the equipment size large and occupy space

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