Multi-stage magnetic liquid sealing device for sealing liquid

A technology of magnetic liquid and sealing liquid, which is applied in the field of sealing where the magnetic liquid and the sealed medium can dissolve or contaminate each other, and in the field of multi-stage magnetic liquid sealing devices, can solve problems such as sealing failure, and achieve zero leakage and reduce The effect of working torque

Inactive Publication Date: 2017-05-17
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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  • Multi-stage magnetic liquid sealing device for sealing liquid

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Embodiment Construction

[0023] The present invention will be further explained by taking the drawings as specific embodiments:

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

[0025] The connections between the various parts that make up the device:

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

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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 liquids, which belongs to the technical field of mechanical engineering sealing, and is particularly suitable for sealing when the magnetic liquid and the sealed medium are mutually soluble or mutually contaminated. Background technique [0002] At present, the mainstream sealing method is mechanical seal. However, pure mechanical seal cannot achieve zero leakage, and the amount of wear is large and easily pollutes the sealing medium or working environment. The magnetic liquid sealing technology has zero leakage, no wear, and long life. The advantages of simple structure and so on are gradually being used by more and more industries. However, when the sealing medium is liquid, the magnetic liquid is easy to dissolve or contaminate with the sealed liquid. [0003] The existing magnetic liquid sealing structure is described in Comparative Document 1 (Patent Application for Publica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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