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Method for Improving Pressure Capability of Magnetic Fluid Sealing by Using Magnetic Nanowire Magnetic Fluid

A technology of magnetic liquid and pressure resistance, which is applied to engine seals, engine components, mechanical equipment, etc., can solve the problems of low pressure resistance of magnetic liquid seals and limit the application of magnetic liquid seals, and achieve the effect of improving pressure resistance

Inactive Publication Date: 2016-02-10
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pressure resistance of magnetic liquid seals is low, which limits the application of magnetic liquid seals.

Method used

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  • Method for Improving Pressure Capability of Magnetic Fluid Sealing by Using Magnetic Nanowire Magnetic Fluid
  • Method for Improving Pressure Capability of Magnetic Fluid Sealing by Using Magnetic Nanowire Magnetic Fluid
  • Method for Improving Pressure Capability of Magnetic Fluid Sealing by Using Magnetic Nanowire Magnetic Fluid

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Experimental program
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Effect test

Embodiment approach 1

[0014] Firstly, in the solution in which the magnetically conductive nanowires are dissolved, the nanowires with a lateral size of 10-30 nm and a length of 100-150 μm are screened out. Then add the above-mentioned nanowires with a volume of 5% of the volume of the magnetic liquid in the purchased fluorocarbon-based magnetic liquid, and add an appropriate amount of surfactant to prevent the precipitation of the nanowires, and stir for 40 minutes to form a magnetic nanowire magnetic liquid. . The magnetic liquid of the magnetically permeable nanowire is injected into the sealing gap sealed by the magnetic liquid.

Embodiment approach 2

[0016] First, in the solution in which the magnetically conductive nanowires are dissolved, the nanowires with a lateral dimension of 30-70 nm and a length of 150-250 μm are screened out. Then, add the above-mentioned nanowires with a volume of 6% of the volume of the magnetic liquid to the purchased ester-based magnetic liquid, and add an appropriate amount of surfactant to prevent the precipitation of the nanowires, and stir for 45 minutes to form a magnetic nanowire magnetic liquid. The magnetic liquid of the magnetically permeable nanowire is injected into the sealing gap of the magnetic liquid.

[0017] After using the magnetic nanowire magnetic liquid in the magnetic liquid seal, the nanowires in the magnetic nanowire magnetic liquid between the pole teeth and the rotating shaft will be arranged radially under the action of the magnetic field, as shown in the attached figure 1 , 2 shown. After the side of the seal is pressurized, the permanent magnet will form a certai...

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Abstract

The invention provides a method for increasing the sealing and pressure resisting capacity of magnetic liquid by using magnetoconductivity nanowire magnetic liquid, belongs to the technical field of mechanical engineering sealing and is particularly suitable for the sealing of the magnetic liquid. The magnetoconductivity nanowire magnetic liquid is formed by adding nanowires of which the lateral dimension is 10-100 nm and the length is 100-300 mum in existing magnetic liquid, then adding appropriate surface active agent and stirring the mixture for 40-50 minutes. The magnetoconductivity nanowire magnetic liquid is injected in a sealing gap sealed by the magnetic liquid. The existing magnetic liquid comprises fluorocarbon-based magnetic liquid, ester-based magnetic liquid and the like. According to the method provided by the invention, the problem that the sealing and pressure resisting capacity of the existing magnetic liquid is lower is solved.

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] With the rapid development of machinery, chemical industry and other fields, higher and higher requirements are put forward for sealing performance. Traditional sealing forms, such as mechanical seals and brush seals, cannot meet the requirements of zero leakage in many applications. The magnetic liquid seal has the advantages of zero leakage, long life and high reliability, so it has been widely used in the fields of machinery and chemical industry. However, the pressure resistance of magnetic liquid seals is low, which limits the application of magnetic liquid seals. As a new synthetic material, nanowires have the advantages of small cross-sectional size and good mechanical properties. The method fully utilizes the advantages of the nanowire and the magnetic liquid seal, and has impor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16J15/43
Inventor 李德才王忠忠
Owner BEIJING JIAOTONG UNIV
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