Magnetofluid sealing structure

Abstract

The invention provides a magnetofluid sealing structure. The magnetofluid sealing structure comprises a hollow shell and a rotary shaft. The outer circle face of the rotary shaft is sleeved with a first pole shoe sleeve and a second pole shoe sleeve, wherein the first pole shoe sleeve and the second pole shoe sleeve are of rotary body structures. Multiple stages of annular steps are arranged on each of the first pole shoe sleeve and the second pole shoe sleeve. The position between the first pole shoe sleeve and the second pole shoe sleeve is sleeved with a permanent magnet. The positions, corresponding to the annular steps of the first pole shoe sleeve and the second pole shoe sleeve, of the inner wall of the shell are sleeved with a third annular pole shoe. First step segments corresponding to the annular steps of the first pole shoe sleeve one to one and second step segments corresponding to the annular steps of the second pole shoe sleeve one to one are arranged on the inner circleface of the third pole shoe, wherein gaps Y are formed between the annular steps of the first pole shoe sleeve and the first step segments, and gaps Z are formed between the annular steps of the second pole shoe sleeve and the second step segments. The gaps Y and the gaps Z are filled with magnetofluid. Magnetofluid sealing of the special-shaped rotary shaft is achieved by transferring sealing positions of the magnetofluid. Meanwhile, through stepped magnetofluid sealing, sealing can be achieved in the radial direction and the axial direction, and high sealing performance and high pressure resistance are achieved.

Description

technical field [0001] The invention belongs to sealing technology, in particular to a 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. The sealing position of the existing magnetic fluid sealing technology is related to the rotating shaft, that is to say, the sealing position occurs at the outer circular surface of the rotating shaft. special-shaped shaft, then it cannot be sealed with the existing magnetic fluid sealing structure. [0006] 2. On the oute...

AI Technical Summary

Problems solved by technology

[0005] 1. The sealing position of the existing magnetic fluid sealing technology is related to the rotating shaft, that is to say, the sealing position occurs at the outer circular surface of the rotating shaft. special-shaped shaft, then it cannot be sealed with the existing magnetic fluid seal structure

[0006] 2. On the outer surface of the rotating shaft, the area where the magnetic fluid is sealed is generally the optical axis section. Once the magnetic fluid leaks, it will cause complete leakage and seal failure

[0007] 3. 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

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

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