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Magnetic fluid sealing structure

A magnetic liquid and sealing structure technology, applied in the direction of engine sealing, engine components, mechanical equipment, etc., can solve the problems of difficult processing and assembly, limited sealing pressure, reduce magnetic flux leakage, increase sealing pressure, The effect of increasing the strength of the magnetic field

Inactive Publication Date: 2012-06-27
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the usual magnetic liquid seal, the way to increase the seal pressure resistance is to reduce the seal gap, but this will bring difficulties in processing and assembly
At the same time, the increase of the sealing withstand pressure brought by the method of increasing the saturation magnetization of the magnetic liquid and the magnetic energy product of the permanent magnet is also limited.

Method used

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Embodiment Construction

[0020] The present invention will be further described with accompanying drawing as specific embodiment:

[0021] A magnetic liquid sealing structure, which comprises: a small end cap 5, a magnetically conductive sleeve 1, an outer jacket 8, a first magnetic isolation ring 9, first and second O-shaped sealing rings 11, 14, and a second magnetic isolation ring 16 , First and second bearings 6, 17, adjusting gasket 20, first and second pole shoes 10, 15, magnetic fluid 2, permanent magnet 13, large end cap 19.

[0022] The first and second O-rings 11 and 14 are respectively installed in the concave grooves on the outer circles of the first and second pole pieces 10 and 15; the first pole piece 10 and the second pole piece 15 have the same structural size; A bearing 6, a first magnetic isolation ring 9, a first pole shoe 10 with a first O-ring 11 installed, a permanent magnet 13, a second pole shoe 15 with a second O-ring 14 installed, a second spacer The magnetic ring 16 and th...

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Abstract

The invention relates to a magnetic fluid sealing structure, belongs to the technical field of mechanical engineering sealing and solves the problem how to improve the pressure resistance capability of magnetic fluid sealing. The magnetic fluid sealing structure comprises a small end cover (5), a concentrating flux sleeve (1), an outer sleeve (8), a first magnetism isolating ring (9), first and second O-shaped sealing rings (11, 14), a second magnetism isolating ring (16), first and second bearings (6, 17), an adjusting washer (20), first and second pole shoes (10, 15), magnetic fluid (2), a permanent magnet (13) and a big end cover (19). In the magnetic fluid sealing structure, magnetic lubricating grease is respectively coated on the joint surface of the first pole shoe (11) and the permanent magnet (13) and on the joint surface of the second pole shoe (15) and the permanent magnet (13). The first magnetism isolating ring (9) and the second magnetism isolating ring (16) have the same structure and size and have thicknesses h of 2 to 10mm. Due to the selection of the widths l of the first and second magnetism isolating rings, the axial distances g of bearings and the pole shoes, which are positioned at both ends of the first and second magnetism isolating rings, are greater than or equal to 5mm and less than 15mm.

Description

technical field [0001] The invention belongs to the technical field of mechanical engineering sealing, and is particularly suitable for vacuum sealing or pressure sealing in the fields of military industry, ships, aerospace and aviation. Background technique [0002] In some special fields of production practice, when designing magnetic liquid seals, the space allowed to design the magnetic circuit is very limited, which requires a larger seal pressure resistance in a certain design space. In the usual magnetic liquid seal, the way to increase the pressure resistance of the seal is to reduce the seal gap, but this will bring difficulties in processing and assembly. At the same time, the increase of the sealing pressure resistance brought by the method of increasing the saturation magnetization of the magnetic liquid and the magnetic energy product of the permanent magnet is also limited. Therefore, on the basis of the existing magnetic liquid seal structure, how to maximize...

Claims

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Application Information

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IPC IPC(8): F16J15/43
Inventor 李德才杨文明
Owner BEIJING JIAOTONG UNIV
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