Magnetohydrodynamic sealing device

By setting an annular space and a magnetofluid assembly between the outer sleeve made of non-magnetic material and the rotating body, and using the magnetic field lines formed by permanent magnets to fill the gap, the problem of applying magnetofluid sealing on non-magnetic materials is solved, and effective sealing of the rotating body is achieved.

CN122083145APending Publication Date: 2026-05-26CHINA NUCLEAR POWER ENGINEERING CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA NUCLEAR POWER ENGINEERING CO LTD
Filing Date
2026-04-09
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing magnetohydrodynamic sealing devices cannot be applied to non-magnetic materials, such as stainless steel, which renders automated sampling devices unusable in the nuclear chemical reprocessing stage.

Method used

A magnetofluid sealing device is designed, comprising an outer sleeve, a rotating body, and a magnetofluid assembly. Both the outer sleeve and the rotating body are made of non-magnetic materials and have an annular placement space inside. The magnetofluid assembly consists of a first pole shoe ring, a permanent magnet, and a second pole shoe ring arranged along the axial direction of the rotating body. The magnetic poles of the permanent magnet are parallel to the axial direction of the rotating body, forming a gap between the first and second pole teeth. The magnetofluid fills the gap under the action of the permanent magnet to achieve a seal.

Benefits of technology

It realizes the application of magnetohydrodynamic sealing on non-magnetic materials, ensuring effective sealing between the rotating body and the outer sleeve, and is suitable for locations with limited space.

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Abstract

This invention discloses a magnetic fluid sealing device that enables magnetic fluid sealing to be applied to non-magnetic materials. The magnetic fluid sealing device includes an outer sleeve, a rotating body, and a magnetic fluid assembly. The outer sleeve is made of a non-magnetic material. The rotating body is rotatably disposed within the outer sleeve; the rotating body is also made of a non-magnetic material; an annular space is formed between the inner wall of the outer sleeve and the rotating body. The magnetic fluid assembly is disposed within the annular space and includes a first pole shoe ring, a permanent magnet, and a second pole shoe ring arranged sequentially along the axial direction of the rotating body; the magnetic pole direction of the permanent magnet is parallel to the axial direction of the rotating body; a first pole tooth gap is formed between the inner rings of the first and second pole shoe rings, and a second pole tooth gap is formed between the outer rings of the first and second pole shoe rings; both the first and second pole tooth gaps are filled with magnetic fluid.
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