Step type reciprocating sealing device with pole shoes and lip-shaped sealing rings alternatively mixed

Abstract

The invention relates to a step type reciprocating sealing device with pole shoes and lip-shaped sealing rings alternatively mixed. The step type reciprocating sealing device comprises a shaft, a housing, outer ring concentrating flux sleeves, inner ring concentrating flux sleeves, polar shoe rings and permanent magnet rings, wherein the inner walls of the outer ring concentrating flux sleeve arestep ring surfaces, and the diameter of the step ring surface at each stage is sequentially reduced from left to right; the inner ring concentrating flux sleeves sleeve the shaft and are positioned within the outer ring concentrating flux sleeves; one or more groups of polar shoe rings are arranged on the outer circular surfaces of the inner ring concentrating flux sleeves at intervals; the permanent magnet rings are arranged among the polar shoe rings; each permanent magnet ring is separately in contact with the end surface of the adjacent polar shoe ring; one or more groups of ring-shaped grooves I and polar teeth are axially formed in the outer circular surfaces of the polar shoe rings at intervals; and the ring-shaped grooves A and the polar teeth are alternatively distributed. The step type reciprocating sealing device aims to solve the problem that an existing single-magnetic-source magnetic fluid sealing device and an existing multi-magnetic-source magnetic fluid sealing deviceare low in pressure resistance.

Description

technical field [0001] The invention belongs to the field of mechanical engineering sealing, in particular to a reciprocating sealing device in which stepped pole pieces and lip-shaped sealing rings are alternately mixed. Background technique [0002] The reciprocating seal also has many defects because the technology is not perfect: the magnetic liquid is easy to leak. During the reciprocating motion of the shaft, part of the liquid will adhere to form a liquid film; when the magnetic field force is not enough to bind this film, the magnetic liquid will enter the secret chamber under the action of pressure difference, causing pollution; the working temperature range is small. Because the viscosity of the liquid decreases at high temperature, the pressure resistance decreases, so refrigeration measures should be used; the pressure resistance capacity is reduced due to leakage. In general, the advantages of this technology are unique, and as people explore it further, these ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a reciprocating sealing device in which stepped pole pieces and lip-shaped sealing rings are alternately mixed, thereby solving the problem of low pressure resistance existing in existing single magnetic source magnetic fluid sealing devices and multi-magnetic source magnetic fluid sealing devices. At the same time, the stress concentration is reduced, making this sealing technology successfully applied in the fields of construction machinery reciprocating shaft seals and other fields

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