Magnetic fluid reciprocating sealing structure

Abstract

The invention discloses a magnetic fluid reciprocating sealing structure. A plurality of radial magnetizing-type permanent magnet rings are arranged at intervals in the axial direction in the space between the outer surface of a shaft and the inner wall of a shell, annular pole shoes are sandwiched between every two adjacent radial magnetizing-type permanent magnet rings, and the cross sections ofthe pole shoes are trapezoids with wide upper parts and narrow lower parts; the radial magnetizing-type permanent magnet rings are provided with bonding surfaces which can be correspondingly bonded to the side surfaces of the pole shoes, and the two side surfaces of the pole shoes are separately connected and matched with every two adjacent radial magnetizing-type permanent magnet rings in an abutting mode; the outer circles of the radial magnetizing-type permanent magnet rings and the outer circles of the pole shoes are connected to the inner wall of the shell in an abutting mode; gaps existbetween the inner circular surfaces of the radial magnetizing-type permanent magnet rings and the outer surface of the shaft, and magnetic fluid is injected at the gaps; and the polarities of the magnetic poles of every two adjacent radial magnetizing-type permanent magnet rings are opposite. The trapezoidal cross-section design increases the contact area between the pole shoes and the radial magnetizing-type permanent magnet rings, and the radial magnetizing-type permanent magnet rings on both sides wrap the pole shoes, so that magnetic leakage hardly occurs, and the sealing and pressure resistance performances are better.

Description

technical field [0001] The invention belongs to the field of mechanical engineering seals, in particular to a magnetic fluid reciprocating seal structure. Background technique [0002] The existing magnetic fluid sealing structure generally includes a housing with a hollow cavity, a shaft, a permanent magnet and a pole shoe are arranged between the shaft and the housing for magnetic fluid sealing, and the inner ring of the pole shoe is provided with pole teeth. [0003] The leakage of the magnetic field in the magnetic fluid seal leads to the reduction of the magnetic field strength in the magnetic circuit, thereby reducing the pressure resistance of the magnetic fluid seal. Such as figure 1 As shown, at present, the pole piece 3 and the axially magnetized permanent magnet ring 8 are both standard annular structures, the cross-sections of both are rectangular, and the joint surface of the two is the main location where the magnetic flux leakage occurs in the magnetic fluid ...

AI Technical Summary

Problems solved by technology

According to the inventor, the lower permanent magnet ring of this patent adopts a parallel structure, the main purpose is to increase the magnetic field strength, and there is still serious magnetic flux leakage between the upper permanent magnet ring and the pole piece

Images