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Multistage magnetic liquid sealing device for sealing liquid

A technology of magnetic liquid and sealing liquid, which is applied to the sealing under the condition that the magnetic liquid and the sealed medium can dissolve or contaminate each other. Effect of working torque

Inactive Publication Date: 2015-10-21
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is that due to its own structural defects in the existing sealing form, when the sealing medium is liquid, the magnetic liquid and the sealed liquid dissolve or contaminate each other, resulting in seal failure

Method used

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  • Multistage magnetic liquid sealing device for sealing liquid

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Embodiment Construction

[0023] The present invention will be further described with accompanying drawing as specific embodiment:

[0024] A multi-stage magnetic liquid sealing device for sealing liquid, the device includes a casing 1, a first bearing 2, a limit ring 3, a snap ring 4 of the first casing, a spring 5, a static ring 6, a pressure control valve 7, a moving ring 8, a tightening ring Set screw 9, left pole shoe 10, permanent magnet 11, right pole shoe 12, magnetic isolation stop ring 13, shell rubber seal ring 14, left snap ring 15, stop ring 16, limit ring rubber seal ring 17, static ring rubber Sealing ring 18, moving ring rubber sealing ring 19, second housing snap ring 20, left pole shoe rubber sealing ring 21, shaft 22, magnetic fluid 23, right pole shoe rubber sealing ring, 24 second bearing 25, right snap ring 26 , threaded end cap 27,

[0025] Connections between the parts making up the device:

[0026] When assembling, put the first bearing 2 into the left end of the inner cavity...

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Abstract

The invention discloses a multistage magnetic liquid sealing device for sealing liquid, and belongs to the field of mechanical engineering sealing. The device comprises a first-stage seal formed by a spacing ring (3) and a spiral sealing groove in a shaft (22), a second-stage seal formed by a pressure sensor, a pressure control valve (7), a spring (5), a stationary ring (6) and a moving ring (8), and a third-stage seal formed by a first sealing assembly, wherein the first-stage seal mainly exerts a sealing function on a sealed liquid medium in a sealing cavity; the second-stage seal exerts a static sealing function when the shaft (22) does not rotate, and separates the stationary ring (6) from the moving ring (8) by gas pressure in an operating state and exerts a sealing action on the sealed liquid medium in the sealing cavity to allow the sealed medium to be out of touch with magnetic liquid (23); and the third-stage seal exerts a sealing function on the gas charged into a cavity between the stationary ring (6) and a left pole piece (10). The device successfully solves the problem that the conventional sealing form cannot avoid mutual dissolution or cross contamination of the magnetic liquid and the sealed liquid.

Description

technical field [0001] The invention relates to a multi-stage magnetic liquid sealing device for sealing liquid, which belongs to the technical field of mechanical engineering sealing, and is especially suitable for the sealing under the condition that the magnetic liquid and the medium to be sealed can dissolve or pollute each other. Background technique [0002] At present, the mainstream sealing method is mechanical seal. However, a simple mechanical seal cannot achieve zero leakage, and the large amount of wear will easily pollute the sealing medium or the working environment. Magnetic liquid sealing technology has zero leakage, no wear, and long life. Simple structure and other advantages are gradually being used by more and more industries. However, when the sealing medium of pure magnetic liquid seal is liquid, the magnetic liquid is easy to dissolve or contaminate with the sealed liquid. [0003] Existing magnetic liquid sealing structure, as described in reference 1...

Claims

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Application Information

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IPC IPC(8): F16J15/43
CPCF16J15/43
Inventor 李德才姚杰姜华伟黄串
Owner BEIJING JIAOTONG UNIV
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