Method for improving pressure-resistant capacity and working reliability of magnetic fluid seal in high-temperature working environment

A magnetic liquid and working environment technology, applied in the direction of engine seals, engine components, mechanical equipment, etc., can solve the problems of magnetic performance decline, magnetic liquid seal pressure resistance drop, seal gap increase, etc.

Inactive Publication Date: 2015-06-10
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the decrease of the magnetism of the permanent magnet at high temperature, the viscosity of the magnetic liquid also decreases with the increase of temperature, and the magnetic performance decreases. It affects the application of magnetic liquid seals in high temperature fields

Method used

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  • Method for improving pressure-resistant capacity and working reliability of magnetic fluid seal in high-temperature working environment
  • Method for improving pressure-resistant capacity and working reliability of magnetic fluid seal in high-temperature working environment
  • Method for improving pressure-resistant capacity and working reliability of magnetic fluid seal in high-temperature working environment

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0019] Choose 4J36 alloy and 45 steel, use 45 steel to make the pole shoe and seal shaft that cooperate with each other, and use the 4J36 alloy to make the pole shoe cover that is interference fit with the outer ring of the two pole shoes. Among them, the diameter of the sealing shaft is 80mm, the outer diameter of the pole piece is 120mm, and the radial width of the pole piece cover is 20mm. The pole piece and the sealing shaft are combined with other parts to form a magnetic liquid sealing device with a gap of 0.2mm. This device is applied to magnetic liquid sealing under the high temperature condition of 100°C.

Embodiment approach 2

[0021] Choose 4J36 alloy and 45 steel, use 45 steel to make the pole shoe and seal shaft that cooperate with each other, and use the 4J36 alloy to make the pole shoe cover that is interference fit with the outer ring of the two pole shoes. The diameter of the sealing shaft is 50mm, the outer diameter of the pole shoe is 80mm, and the radial width of the pole shoe cover is 15mm. The pole shoe and the sealing shaft are combined with other parts to form a magnetic liquid sealing device with a gap of 0.1mm. This device is applied to the magnetic liquid seal under the high temperature condition of 200°C.

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Abstract

The invention discloses a method for improving the pressure-resistant capacity and the working reliability of a magnetic fluid seal in a high-temperature working environment, belongs to the technical field of mechanical engineering seals, and is particularly applicable to the magnetic fluid seal. An iron-nickel alloy material with the anomalous thermal expansion characteristic and a ferromagnetic material with the larger thermal expansion coefficient and good comprehensive mechanical properties are selected, pole shoes and a sealing shaft which are matched with each other are made of the selected ferromagnetic material, pole shoe sleeves which are in interference fit with outer rings of the two pole shoes are made of the selected iron-nickel alloy material, and the radial width ratio of each alloy sleeve to each pole shoe is 1:2. With the adoption of the method, defects of existing methods for the magnetic fluid seal at the high temperature are overcome, and the method has the important significance in solving usage problems of the magnetic fluid seal in the high-temperature environment and broadening the application range of the magnetic fluid seal.

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. Fields such as chemical industry and aerospace often require magnetic liquids to work in high-temperature environments for a long time, for example, the working temperature of a certain equipment reac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J15/43F16J15/53
CPCF16J15/43
Inventor 李德才李振坤王忠忠
Owner BEIJING JIAOTONG UNIV
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