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
CN104989830BInactive Publication Date: 2017-05-17BEIJING JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING JIAOTONG UNIV
Publication Date
2017-05-17
Estimated Expiration
Not applicable Β· inactive patent

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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.
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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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