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Sealing device for improving sealing anti-pressure capability and sealing reliability of magnetic liquid

A technology of pressure resistance and magnetic liquid, which is applied in the direction of engine seals, engine components, mechanical equipment, etc., can solve the problems of seal failure, large seal pressure resistance, reduction, etc., to expand the safe working range, easy to install, improve The effect of withstand voltage capability and reliability

Inactive Publication Date: 2014-01-08
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For the seal of mechanical equipment with a rotating shaft with a radial seal gap height greater than 1mm, traditional seals such as packing or mechanical seals cannot meet the zero leakage requirements due to the wear and tear between the shaft and the housing, which leads to the failure of the seal
Although the new magnetic liquid sealing technology has the advantage of zero leakage, the sealing pressure resistance capacity is greatly reduced due to the large gap, so it cannot meet the requirements of high sealing performance and sealing reliability

Method used

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  • Sealing device for improving sealing anti-pressure capability and sealing reliability of magnetic liquid
  • Sealing device for improving sealing anti-pressure capability and sealing reliability of magnetic liquid
  • Sealing device for improving sealing anti-pressure capability and sealing reliability of magnetic liquid

Examples

Experimental program
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Effect test

Embodiment approach 1

[0025] A sealing device that improves the pressure resistance and sealing reliability of magnetic liquid seals, such as figure 1 As shown, the sealing device includes: shaft 1, housing 2, first and second magnetic isolation rings 6, 10, first to third pole shoes 7-1, 7-2, 7-3, first to third Rubber rings 8-1, 8-2, 8-3, first and second permanent magnets 9-1 and 9-2, first and second bearings 5 ​​and 11, end caps 12, first and second retaining springs 3, 13.

[0026] The shaft 1 is a stepped shaft, and the material of the stepped shaft is 2cr13 stainless steel.

[0027] The material of the shell 2 is non-magnetic stainless steel.

[0028] The material of the first to third pole pieces 7-1, 7-2, 7-3 is 2cr13 stainless steel.

[0029] The materials of the first and second permanent magnets 9-1 and 9-2 are all NdFeB materials.

[0030] Pole teeth are processed on the right sides of the first pole piece, the second pole piece and the third pole piece, and the number of pole tee...

Embodiment approach 2

[0044] A sealing device that improves the pressure resistance and sealing reliability of magnetic liquid seals, such as image 3 As shown, the sealing device includes: shaft 1, housing 2, first and second magnetic isolation rings 6, 10, first to third pole shoes 7-1, 7-2, 7-3, first to third Rubber rings 8-1, 8-2, 8-3, first and second permanent magnets 9-1 and 9-2, first and second bearings 5 ​​and 11, end caps 12, first and second retaining springs 3, 13.

[0045] The shaft 1 is a stepped shaft, and the material of the stepped shaft is 2cr13 stainless steel.

[0046] The material of the shell 2 is non-magnetic stainless steel.

[0047] The material of the first to third pole pieces 7-1, 7-2, 7-3 is 2cr13 stainless steel.

[0048] The materials of the first and second permanent magnets 9-1 and 9-2 are all NdFeB materials.

[0049] Pole teeth are processed on the right sides of the first pole piece, the second pole piece and the third pole piece, and the number of pole tee...

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Abstract

The invention provides a sealing device for improving the sealing anti-pressure capability and the sealing reliability of magnetic liquid, and belongs to sealing devices of rotating shafts. The problems that large-gap sealing is low in anti-pressure capability and poor in reliability are solved. A shaft of the sealing device is a step shaft, the right side face of a first pole shoe, the right side face of a second pole shoe and the right side face of a third pole shoe, or shaft shoulders of steps from the second to the fourth are provided with pole teeth, the axial gap widths of the pole shoes and the shaft shoulders are smaller than the radial gap widths between the pole shoes and the step shaft, and the sealing device for improving the sealing anti-pressure capability and the sealing reliability of the magnetic liquid is achieved. The defect that the large-gap magnetic liquid is low in sealing anti-pressure capability is overcome, the transformation from an axial drainage channel to a radial drainage channel is achieved, the sealing anti-pressure capability and the sealing reliability of the magnetic liquid under the condition of large gaps are improved, and the safety working range is widened. Therefore, the sealing device is an ideal sealing device for solving the problems of being low in large-gap sealing anti-pressure capability and poor in reliability.

Description

technical field [0001] The invention belongs to the field of mechanical engineering sealing, in particular to a sealing device for improving the pressure resistance and sealing reliability of magnetic liquid seals Background technique [0002] For the seal of mechanical equipment with a rotating shaft with a radial seal gap height greater than 1mm, traditional seals such as packing or mechanical seals cannot meet the zero leakage requirements due to wear and tear between the shaft and the housing, which leads to seal failure. Although the new magnetic liquid sealing technology has the advantage of zero leakage, the sealing pressure resistance capacity is greatly reduced due to the large gap, so it cannot meet the requirements of high sealing performance and sealing reliability. Therefore, it is of great significance to improve the sealing performance and sealing reliability of magnetic liquid under the condition of large gap. Contents of the invention [0003] The technic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J15/43
Inventor 杨小龙李德才
Owner BEIJING JIAOTONG UNIV
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