Magnetic liquid seal

Abstract

A magnetic liquid sealing device provided by an embodiment of the present invention includes a shaft housing, a rotating shaft, a bearing, and a pole piece. The pole shoe is set on the rotating shaft, and the pole shoe is matched with the permanent magnet. The pole shoe has a plurality of pole teeth spaced apart along the axial direction of the rotating shaft. Each pole tooth has a hole. A plurality of pole tooth sets, each pole tooth set includes at least one pole tooth, the total volume of the pores of each pole tooth set adjacent to the permanent magnet in the axial direction of the rotating shaft is smaller than that of each pole tooth set far away from the permanent magnet The total volume of the pores of a pole tooth, the magnetic liquid is filled between the tooth top surface of the pole tooth and the peripheral surface of the rotating shaft, the pores are filled with magnetic liquid, the magnetic liquid in the pores and the peripheral surface located on the tooth top surface and the rotating shaft contact with the magnetic fluid. The magnetic liquid sealing device provided by the embodiments of the present invention has the advantages of long service life, good sealing performance, good pressure resistance, high temperature resistance and reasonable design.

Description

technical field [0001] The invention relates to the technical field of mechanical engineering sealing, in particular to a magnetic liquid sealing device comprising a pole shoe with a porous structure. Background technique [0002] As a sealing method capable of achieving "zero leakage", magnetic liquid seals are widely used in more and more industries. Its working principle is that under the action of the magnetic field generated by the permanent magnet, the magnetic liquid placed in the gap between the rotating shaft and the top of the pole tooth is concentrated to form an "O" ring, and the gap channel is blocked to achieve the purpose of sealing. However, under high-speed working conditions, part of the magnetic liquid is easily subjected to centrifugal force and leaves the gap between the rotating shaft and the pole teeth, resulting in seal failure. Moreover, the friction between the magnetic liquid and the rotating shaft due to the continuous shearing will cause the tem...

AI Technical Summary

Problems solved by technology

However, under the condition of high speed, part of the magnetic liquid is easily separated from the gap between the shaft and the pole teeth due to centrifugal force, resulting in failure of the seal.

Moreover, the friction between the magnetic liquid and the rotating shaft due to continuous shearing will cause the temperature of the device to rise. Due to the rise in temperature, part of the magnetic liquid will be heated and evaporated, which will eventually lead to the sealing failure of the sealing device.

Therefore, the problem that the pressure resistance and high temperature resistance of the magnetic liquid sealing device in the related art is easy to decline under the condition of high speed needs to be solved.

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