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Variable-tooth and variable-gap type magnetic fluid reciprocating sealing structure for hydraulic cylinder

A sealing structure and magnetic fluid technology, applied in the direction of engine sealing, fluid pressure actuating device, engine components, etc., can solve the problems of wasting cost, increasing the volume of magnetic fluid sealing structure, etc., and achieve the effect of improving the sealing pressure resistance performance

Pending Publication Date: 2018-11-09
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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  • Variable-tooth and variable-gap type magnetic fluid reciprocating sealing structure for hydraulic cylinder
  • Variable-tooth and variable-gap type magnetic fluid reciprocating sealing structure for hydraulic cylinder
  • Variable-tooth and variable-gap type magnetic fluid reciprocating sealing structure for hydraulic cylinder

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Experimental program
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Effect test

Embodiment Construction

[0032] Such as Figure 1-3 As shown, a variable-tooth variable-gap ferrofluid reciprocating sealing structure for a hydraulic cylinder 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 the piston rod 1 penetrating from the through hole to the inner cavity of the housing 2 .

[0033] In the space between the outer surface of the piston rod 1 and the inner wall of the housing 2, a plurality of annular pole pieces 3 are axially spaced apart. Pole teeth 6 are arranged on the inner surface of the pole shoe 3 . An axially magnetized permanent magnet ring 7 is sandwiched between two adjacent pole pieces 3 .

[0034] The cross sections of the pole piece 3 closest to the closed end of the housing 2 and the pole piece 3 closest to the open end of the housing 2 are both L-shaped, and the axial extensions 31 of the two pole pieces 3 face each other. All pole...

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Abstract

The invention discloses a variable-tooth and variable-gap type magnetic fluid reciprocating sealing structure for a hydraulic cylinder. Multiple annular pole shoes are arranged in the space between the outer surface of a piston rod and the inner wall of the shell in the axial direction at intervals, pole teeth are arranged on the inner circumferential face of each pole shoe, an axial magnetizing type permanent magnetic ring is clamped between every two adjacent pole shoes, the polarities of magnetic poles of every two adjacent axial magnetizing type permanent magnetic rings are opposite, gapsare formed between the pole teeth and the outer surface of the piston rod and filled with magnetic fluid, the sizes of the gaps between the pole teeth and the outer surface of the piston rod are sequentially decreased in the direction from the high-pressure side to the low-pressure side, and the sizes of the gaps between all the pole teeth arranged on the same pole shoe and the outer surface of the piston rod are equal. According to the variable-tooth and variable-gap type magnetic fluid reciprocating sealing structure for the hydraulic cylinder, the condition that the pressure endurance capability is gradually enhanced, and the magnetic fluid leakage resistance is gradually increased is formed through the structure change, and then the effect of further improving the sealing pressure resistance is achieved.

Description

technical field [0001] The invention belongs to mechanical engineering sealing technology, in particular to a tooth-variable-gap magnetic fluid reciprocating sealing structure for a hydraulic cylinder. Background technique [0002] The existing magnetic fluid sealing structure for reciprocating motion generally includes a housing with a hollow cavity, a piston rod, a permanent magnet and a pole shoe are arranged between the piston rod and the housing for magnetic fluid sealing, and pole teeth are provided on the inner ring of the pole shoe. [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 the existing magnetic fluid sealing performance is not perfect, and there is still room for further improvement. [0004] In add...

Claims

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Application Information

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IPC IPC(8): F15B15/14F16J15/43
CPCF15B15/1423F15B15/1452F16J15/43
Inventor 杨小龙王国宏
Owner GUANGXI UNIVERSITY OF TECHNOLOGY
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