Low-temperature and small-diameter magnetic fluid seal device

A magnetic liquid and sealing device technology, which is applied to the sealing of engines, engine components, mechanical equipment, etc., can solve the problems of small diameters that cannot be applied to low temperatures, and achieve the effects of simple assembly methods, low leakage rates, and long service life

Inactive Publication Date: 2010-07-14
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the existing magnetic liquid sealing method and structure cannot be applied to low temperature and small diameter conditions, and a magnetic liquid sealing device under low temperature and small diameter conditions is provided

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  • Low-temperature and small-diameter magnetic fluid seal device
  • Low-temperature and small-diameter magnetic fluid seal device
  • Low-temperature and small-diameter magnetic fluid seal device

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Embodiment Construction

[0015] The present invention will be further described with accompanying drawing as specific embodiment:

[0016] A low-temperature small-diameter magnetic liquid sealing device, which includes a small end cover 5, a magnetically conductive sleeve 1, a jacket 8, a first bearing 6, a first magnetic isolation ring 9, a first pole shoe 10, and a first O-shaped sealing ring 11. The second O-ring 14 , the second pole shoe 15 , the second magnetic isolation ring 16 , the second bearing 17 , the adjusting gasket 20 , the magnetic liquid 2 , the permanent magnet 13 , and the large end cap 19 .

[0017] The first bearing 6, the first magnetic isolation ring 9, the first pole shoe 10 with the first O-ring 11 installed, the permanent magnet 13, the second pole shoe 15 with the second O-ring 14 installed, the second The magnetic isolation ring 16 and the second bearing 17 are packed in close proximity to the boss of the outer cover 8 in turn; the large end cover 19 is fixed on the outer c...

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PUM

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Abstract

The invention relates to a low-temperature and small-diameter magnetic fluid seal device which has the structure that a first bearing (6), a first magnetic isolating ring (9), a first pole shoe (10) provided with an O-shaped seal ring, a permanent magnet (13), a second pole shoe (15) provided with an O-shaped seal ring, a second magnetic isolating ring (16) and a second bearing (17) are sequentially installed by tightly attaching a boss of an outer sleeve (8); a large end cover (19) is fixed to the outer sleeve by a screw, and the second bearing is tightly pressed; the magnetic liquid is injected, and a magnetic conducting sleeve (1) provided with an adjusting spacer (20) is installed into inner holes of the assembled bearings and the pole shoes and fixed by a screw (4) and a small end cover (5). The tooth shape parameters of seal teeth on the outer column surface of the magnetic conducting sleeve comprise the tooth width of 0.5mm, the tooth height of 2.5mm and the groove width of 1.5mm. The first magnetic isolating ring is installed between the first bearing and the first pole shoe; and the second magnetic isolating ring is installed between the second bearing and the second pole shoe. The invention solves the problem of the seal of magnetic liquid under the conditions of low temperature and small diameter.

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 with a temperature below -40°C and a sealing shaft diameter of less than 40mm in the fields of military industry, ships, aerospace and the like. Background technique [0002] There are many practical applications for magnetic liquid rotary shaft seals with a sealing shaft diameter of 5 to 40 mm, but most of them work at temperatures between 0 and 20 °C. In some special fields, the magnetic liquid is required to work for a long time below -40°C. Such a temperature will cause a large change in the viscosity of the commonly used magnetic liquid, and because the shaft diameter is small, the space for designing the magnetic circuit is small. The bearing around the sealing assembly has magnetic permeability, so the design of the magnetic circuit is relatively difficult. These problems need to be solved urgently ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J15/43
CPCF16J15/43
Inventor 李德才杨文明
Owner BEIJING JIAOTONG UNIV
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