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A serial magnetic fluid seal structure

A ferrofluid seal, series-type technology, applied in the direction of engine seals, mechanical equipment, engine components, etc., can solve the problems of increasing the volume of the ferrofluid seal structure, wasting costs, etc., to increase the secondary pressure bearing capacity and self-repair ability, guarantee the sealing pressure resistance performance, and the effect of enhancing the sealing pressure resistance capacity

Active Publication Date: 2020-01-21
GUANGXI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the multi-stage sealing structure, since the magnetic fluid seal on the low-pressure side cannot function, setting too many stages of pole pieces will only increase the volume of the magnetic fluid sealing structure and waste more costs

Method used

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  • A serial magnetic fluid seal structure

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Effect test

Embodiment Construction

[0032] Such as figure 1 As shown, a serial 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 , and a shaft 1 penetrating from the through hole to the inner chamber of the housing 2 is also included.

[0033] In the space between the outer surface of the shaft 1 and the inner wall of the housing 2, a plurality of first pole shoes 3 are axially spaced apart. The first pole piece 3 is annular. The outer circular surface of the first pole shoe 3 abuts against the inner wall of the housing 2 .

[0034] An axially magnetized permanent magnet ring 7 is interposed between two adjacent first pole pieces 3 . The polarities of the magnetic poles of two adjacent axially magnetized permanent magnet rings 7 are opposite.

[0035] A radially magnetized permanent magnet ring 8 is sheathed on the inner surface of each first pole piece 3 . A second ...

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Abstract

The invention discloses a serial-connected magnetofluid sealing structure. Multiple first pole shoes are arranged in space between the outer surface of a shaft and the inner wall of a shell; axial magnetizing permanent magnet rings are clamped between two adjacent first pole shoes; radial magnetizing permanent magnet rings sleeve the inner circular surfaces of all the first pole shoes; second poleshoes sleeve the inner circular surfaces of all the radial magnetizing permanent magnet rings; pole teeth are arranged on the inner circular surfaces of the second pole shoes; magnetofluid is injected between the pole teeth and the outer surface of the shaft; the polarities of magnetic poles of two adjacent radial magnetizing permanent magnet rings are opposite; each radial magnetizing permanentmagnet ring is positioned in a magnetic loop consisting of the axial magnetizing permanent magnet rings and the first pole shoes on two sides thereof; and the magnetic field directions of the radial magnetizing permanent magnet rings are the same with the magnetic loop directions thereof. The serial-connected magnetofluid sealing structure improves the magnetic field intensity, improves the sealing and pressure resisting capacity, enables magnetofluid seals in all gaps to exert effects through gradual increment of saturated magnetization strength of the magnetofluid in different gaps, and guarantees the sealing and pressure resisting performances.

Description

technical field [0001] The invention belongs to mechanical engineering sealing technology, in particular to a serial magnetic fluid sealing structure. Background technique [0002] The existing magnetic fluid sealing structure for the reciprocating movement of the shaft generally includes a housing with a hollow cavity, a shaft, a permanent magnet and a pole shoe are arranged between the shaft and the housing for magnetic fluid sealing, and the inner ring of the pole shoe is provided with pole teeth. [0003] There are generally two ways to improve the pressure resistance performance of magnetic fluid seals: first, try to increase the magnetic field strength; second, increase the saturation magnetization of magnetic fluid. Most of the starting point is to consider increasing the magnetic field strength, but there is still room for further improvement of the existing magnetic fluid sealing performance. [0004] The inventor found experimentally that from the high-pressure si...

Claims

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Application Information

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