A hybrid magnetic fluid seal structure

Abstract

The invention discloses a hybrid connection type magnetic fluid seal structure. The space between the outer surface of a shaft and the inner wall of a shell body is internally provided with at least two magnetic fluid seal units, each magnetic fluid seal unit comprises a pair of circular pole shoes, pole teeth, a radial magnetization type permanent magnet ring and a seal ring, opposite end surfaces of every two pole shoes are provided with circular grooves correspondingly, and two sides of each radial magnetization type permanent magnet ring are clamped into the circular grooves of two corresponding pole shoes and fixed correspondingly; the side surfaces of every two pole shoes, the inner wall of the shell body and the outer circle surface of each radial magnetization type permanent magnetring enclose a containing space, and each seal ring is arranged inside the corresponding containing space; and an axial direction magnetization type permanent magnet ring is arranged between every two adjacent magnetic fluid seal units in a clamped manner, and the magnetic field direction of each radial magnetization type permanent magnet ring is the same as the direction of a magnetic return path of the corresponding axial direction magnetization type permanent magnet ring where the radial magnetization type permanent magnet ring is in. According to the hybrid connection type magnetic fluidseal structure, by means of improvement of the overall structure, on the one hand, magnetic leakage is reduced; on the other hand, the magnetic field strength is increased, and the seal pressure-resistant performance at seal gaps is improved.

Description

technical field [0001] The invention belongs to mechanical engineering sealing technology, in particular to a hybrid magnetic fluid sealing 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 pole teeth are provided on the inner ring of the pole shoe. [0003] There are generally two ways to improve the pressure resistance performance of magnetic fluid seals: first, try to increase the magnetic field strength; second, increase the saturation magnetization of magnetic fluid. Most of the starting point is to consider increasing the magnetic field strength, but the existing ferrofluid sealing performance is not perfect, and there is still room for further improvement, such as: [0004] (1) The permanent magnets commonly used at present are all single permanent magnet stru...

AI Technical Summary

Problems solved by technology

[0004] (1) At present, the commonly used permanent magnets are all single permanent magnet structures of the axial magnetization type, and the sealing and pressure resistance achieved by matching with pole pieces is limited

[0005] (2) Leakage of the magnetic field in the magnetic fluid seal leads to a decrease in the magnetic field strength in the magnetic circuit, thereby reducing the pressure resistance of the magnetic fluid seal

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