Long-service-life and light-weight magnetofluid dynamic sealing device

Abstract

The invention discloses a long-service-life and light-weight magnetofluid dynamic sealing device. The magnetofluid dynamic sealing device comprises a shell, a rotating shaft, a permanent magnet and pole shoes; the pole shoes are arranged on two sides of the permanent magnet on the inner wall of the shell; the outer circumferences of the pole shoes are hermetically connected with the inner wall of the shell, a gap is formed between the inner circumference of each pole shoe and the outer surface of the rotating shaft, and the gap is filled with magnetic fluid; the rotating shaft is made of a titanium alloy material, the overall weight of the device is reduced, and the outer surface of the rotating shaft and the inner surfaces of the pole shoes are provided with wear-resistant magnetic conductive coatings. Through the wear-resistant magnetic conductive coatings on the surfaces of the rotating shaft and the pole shoes, the device can form a high-density magnetic induction line loop, the magnetofluid is stably and reliably limited in the gaps between the rotating shaft and the pole shoes, and the sealing performance of the whole device is enhanced; the wear-resistant magnetic conductive coatings can reduce the energy loss during working to the greatest extent, surface wear of the pole shoes and the rotating shaft during high-speed rotation of the device is avoided, the structural reliability is improved, and the service life is prolonged.

Description

technical field [0001] The invention relates to a sealing device, in particular to a long-life and lightweight magnetic fluid dynamic sealing device. Background technique [0002] The existing magnetic fluid sealing structure generally includes a housing with a hollow cavity, a rotating shaft, and permanent magnets and pole pieces are arranged between the rotating shaft and the housing for magnetic fluid sealing. Most of the rotating shaft materials are high-quality steel types. For aviation aircraft, the weight of the aircraft is the main influencing factor. The lightweight of materials has the greatest impact on aviation parts. The realization of lightweight materials is conducive to safer and more efficient aircraft complete the flight mission. Therefore, the use of titanium alloy materials as the main material of magnetic fluid seal can realize the lightweight transformation of aerospace. However, the magnetic fluid sealing structure of the titanium alloy material as t...

AI Technical Summary

Problems solved by technology

However, the magnetic fluid sealing structure of the titanium alloy material as the rotating shaft has the following defects: 1. The magnetic permeability is poor, and the magnetic force line circuit cannot be formed to stabilize the magnetic fluid at the sealing gap, causing the magnetic fluid to leak and affecting the sealing performance; 2. Due to the titanium alloy material In the long-term service process, the surface hardness is low, and wear will occur too quickly, resulting in an increase in the radial gap, weakening the magnetic field gradient between them, increasing the pressure difference, reducing the pressure bearing capacity, and eventually leading to seal failure

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