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Method for improving pressure resistance of magnetic liquid seal in low-temperature working environment

A magnetic liquid and working environment technology, applied in the direction of engine seals, engine components, mechanical equipment, etc., can solve problems affecting the application of magnetic liquid seals, large shaft diameters, etc., to achieve reduced seal gaps, improved pressure resistance, and improved The effect of pressure resistance

Inactive Publication Date: 2015-03-11
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The viscosity of the magnetic liquid will change greatly at low temperature, coupled with the large shaft diameter, the starting torque of the rotating shaft will be too large, which seriously affects the application of the magnetic liquid seal in the low temperature field

Method used

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  • Method for improving pressure resistance of magnetic liquid seal in low-temperature working environment
  • Method for improving pressure resistance of magnetic liquid seal in low-temperature working environment
  • Method for improving pressure resistance of magnetic liquid seal in low-temperature working environment

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Experimental program
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Effect test

Embodiment approach 1

[0023] Choose 45 steel material and 40Cr13 material, use 45 steel to make pole shoes, and use the 45 steel and 40Cr13 as the outer layer and inner layer materials to manufacture and process composite material shafts with a diameter range of 100mm, in which the 45 steel material layer and 40Cr13 material layer diameter The length is distributed according to 1:3. Cooperate the pole piece and the composite material shaft to form a magnetic liquid sealing device with a gap of 0.2mm. When the device is applied under the low temperature condition of -190, the clearance is 0.011mm smaller than that of the magnetic liquid sealing device in which both the pole piece and the shaft are made of 45 steel.

Embodiment approach 2

[0025] Select 45 steel material and 30Cr13 material, use 45 steel to make pole shoes, and use the 45 steel and 30Cr17 as the outer layer and inner layer materials to manufacture and process a composite material shaft with a diameter of 80mm, in which the 45 steel material layer and 30Cr17 material layer are radial The length is distributed according to 1:3. Cooperate the pole piece and the composite material shaft to form a magnetic liquid sealing device with a gap of 0.1mm. When the device is applied under the low temperature condition of -100, the clearance is 0.005mm smaller than that of the magnetic liquid sealing device in which both the pole piece and the shaft are made of 45 steel.

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Abstract

The invention provides a method for improving pressure resistance of magnetic liquid seal in a low-temperature working environment, belongs to the technical field of sealing of mechanism engineering, and in particular applies to magnetic liquid seal. The method comprises the steps of selecting a ferromagnetic material with high permeability and large expansion coefficient, and an alloy steel material with small thermal expansion coefficient and high comprehensive mechanical performance; manufacturing a pole shoe with the ferromagnetic material; manufacturing and processing a composite material shaft being 50 to 100mm in diameter by using the ferromagnetic material and the alloy steel material as an outer layer material and an inner layer material, respectively, wherein the radial length ratio of the ferromagnetic material layer to the alloy steel material layer is 1: 3; applying the pole shoe and the composite material shaft into a magnetic liquid seal device of which a gap ranges from 0.1 to 0.25. With the adoption of the method, the shortages of the existing method for magnetic liquid seal under a low temperature can be overcome, the problem of applying to magnetic liquid seal in a low-temperature environment is solved, the applicable scope of magnetic liquid seal is expanded, and the method is of an important significance.

Description

technical field [0001] The invention belongs to the technical field of mechanical engineering sealing, and is especially suitable for magnetic liquid sealing. Background technique [0002] The magnetic liquid seal has the advantages of zero leakage, long life, high reliability, and no pollution, so it has been widely used in the fields of machinery, aviation, and chemical industry. In the magnetic liquid sealing device, usually the sealing gap formed by the pole piece and the shaft is between 0.1 mm and 0.5 mm. Under the action of the magnetic field, the magnetic liquid is filled in the sealing gap. In the magnetic liquid seal, permanent magnets, pole shoes and shafts made of ferromagnetic materials with high magnetic permeability are commonly used to form a magnetic circuit. With the development of aerospace, military and other fields, higher and higher requirements are put forward for sealing. For example, these fields often require magnetic liquids to work in low temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J15/43
CPCF16J15/43
Inventor 李德才李振坤王忠忠
Owner BEIJING JIAOTONG UNIV
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