Divergent split-tooth stepped magnetic fluid rotating sealing device

Abstract

The invention aims to provide a divergent split-tooth stepped magnetic fluid rotating sealing device. The device comprises a shaft, a shell, a first pole shoe ring, a second pole shoe ring, a third pole shoe ring, a fourth pole shoe ring, a first sleeve, a second sleeve, a third sleeve, a first permanent magnet ring, a second permanent magnet ring and a third permanent magnet ring. The sealing device has the advantages that the magnetism gathering effect can be improved, so that the pressure resistance of magnetic fluid is improved; meanwhile, the magnetic fluid sealing failure caused by centrifugal force effect can be effectively prevented, the loss of the magnetic fluid is reduced, and the reliability and the service life of the sealing are improved.

Description

technical field [0001] The invention belongs to the field of mechanical engineering seals, in particular to a divergent split-tooth stepped magnetic fluid rotary seal device. Background technique [0002] Magnetic fluid, also known as magnetic fluid or ferrofluid, is a new type of functional material. In recent years, magnetic fluid has developed rapidly in the field of sealing. Magnetic fluid sealing uses permanent magnets to generate magnetic field force in the sealing gap to firmly fix the magnetic fluid in the sealing gap and resist the pressure difference on both sides to achieve sealing. Effect. Moreover, because many occasions in the industry have strict requirements on sealing, especially requiring no leakage of sealing, and general traditional mechanical seals cannot do this, magnetic fluid seals can solve the above problems well, compared with magnetic fluid sealing technology Because the traditional sealing technology has the advantages of zero leakage rate, no ...

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Problems solved by technology

[0004] As the sealing device described in comparative document 1 (the patent with the publication number CN10311B) and the sealing device described in the comparative document 2 (the patent with the publication number CN207740466U), although the document 1 solves the leakage of the rotary seal when the large gap is on a certain basis However, due to the limitation of the shaft processing conditions, the height of the shaft shoulder should not be greater than 10% of the shaft diameter during design, and the axial clearance cannot play a good pressure resistance effect.

The structure of Document 2 is a multi-stage disc magnetic fluid sealing device, which can solve the problem of low pressure resistance of the magnetic fluid sealing device to a certain extent, but when the radial gap is small, the axial pole teeth play a role The pressure resistance effect is significantly reduced, making it difficult for this sealing technology to be successfully applied in high-speed and heavy-duty fields

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