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An anti-leakage magnetic fluid sealing structure

A magnetic fluid sealing and anti-magnetic leakage technology, applied in the direction of engine sealing, mechanical equipment, engine components, etc., can solve the problems of reduced pressure resistance performance of magnetic fluid seal, insufficient sealing pressure resistance performance, and small flow resistance of magnetic fluid. , to reduce the loss of magnetic fluid, improve the pressure resistance of the seal, and increase the flow resistance.

Active Publication Date: 2020-05-19
GUANGXI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The existing sealing gap is generally located in the radial direction, and the sealing in the axial direction is realized after filling the magnetic fluid, and the sealing pressure resistance performance is not good enough
[0004] 2. Since the traditional structure only has a radial gap, the flow resistance of the magnetic fluid is small, and the risk of leakage along the axial direction is large. The leakage of the magnetic field in the magnetic fluid seal will lead to a decrease in the magnetic field strength in the magnetic circuit, so that the resistance of the magnetic fluid seal Reduced pressure performance

Method used

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  • An anti-leakage magnetic fluid sealing structure
  • An anti-leakage magnetic fluid sealing structure
  • An anti-leakage magnetic fluid sealing structure

Examples

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Embodiment Construction

[0030] Take the magnetic fluid seal of the rotating shaft as an example, such as Figure 1-2 As shown, an anti-leakage magnetic fluid sealing structure includes a hollow shell 2, one end of which is closed and the other end is open. A through hole is opened in the center of the closed end face of the housing 2 . It also includes a shaft 1 penetrating from the through hole to the inner cavity of the housing 2 .

[0031] In the space between the outer surface of the shaft 1 and the inner wall of the housing 2, a plurality of annular pole pieces 3 are axially spaced apart. An axially magnetized permanent magnet ring 7 is sandwiched between two adjacent pole pieces 3 . The outer circle of the axially magnetized permanent magnet ring 7 and the pole shoe 3 abuts against the inner wall of the housing 2 . The polarities of the magnetic poles of two adjacent axially magnetized permanent magnet rings 7 are opposite.

[0032] A shaft sleeve 6 sleeved on the shaft 1 is arranged betwee...

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PUM

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Abstract

The invention discloses a magnetic flux leakage magnetic fluid sealing structure. A plurality of annular pole shoes are axially arranged in a space between the outer surface of a shaft and the inner wall of a shell at intervals, an axial magnetizing permanent magnet ring is clamped between two adjacent pole shoes, magnetic poles of two adjacent axial magnetizing permanent magnet ring are oppositein polarity, a shaft sleeve sleeving a shaft is arranged between every two adjacent pole shoes, the outer diameter of the shaft sleeve is smaller than the inner diameter of each axial magnetizing permanent magnet ring, gaps are reserved among two side end faces of the shaft sleeve and the end faces of the adjacent pole shoes, and a gap is reserved between the inner circumferential surface of eachpole shoe and the outer surface of the shaft and filled with magnetic fluids. Axial and radial sealing can be achieved, and sealing pressure resistance is enhanced. After leakage paths are changed, path lengths are increased, magnetic fluid loss can be reduced, and self-repairing capability is enhanced.

Description

technical field [0001] The invention belongs to the field of mechanical engineering seals, and in particular relates to an anti-leakage magnetic fluid seal structure. Background technique [0002] The existing magnetic fluid sealing structure generally includes a housing with a hollow cavity, a shaft, and a permanent magnet and a pole piece are arranged between the shaft and the housing for magnetic fluid sealing. The defective of prior art mainly shows in the following aspects: [0003] 1. The existing sealing gap is generally located in the radial direction, and the seal in the axial direction is realized after being filled with magnetic fluid, and the sealing pressure resistance performance is not good enough. [0004] 2. Since the traditional structure only has a radial gap, the flow resistance of the magnetic fluid is small, and the risk of leakage along the axial direction is large. The leakage of the magnetic field in the magnetic fluid seal will lead to a decrease i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16J15/43
CPCF16J15/43
Inventor 杨小龙陈帆谢国进
Owner GUANGXI UNIVERSITY OF TECHNOLOGY
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