Magnetic flux leakage magnetic fluid sealing structure

Abstract

The invention discloses a magnetic flux leakage magnetic fluid sealing structure. A plurality of annular pole shoes are axially arranged in a space between the outer surface of a shaft and the inner wall of a shell at intervals, an axial magnetizing permanent magnet ring is clamped between two adjacent pole shoes, magnetic poles of two adjacent axial magnetizing permanent magnet ring are oppositein polarity, a shaft sleeve sleeving a shaft is arranged between every two adjacent pole shoes, the outer diameter of the shaft sleeve is smaller than the inner diameter of each axial magnetizing permanent magnet ring, gaps are reserved among two side end faces of the shaft sleeve and the end faces of the adjacent pole shoes, and a gap is reserved between the inner circumferential surface of eachpole shoe and the outer surface of the shaft and filled with magnetic fluids. Axial and radial sealing can be achieved, and sealing pressure resistance is enhanced. After leakage paths are changed, path lengths are increased, magnetic fluid loss can be reduced, and self-repairing capability is enhanced.

Description

technical field [0001] The invention belongs to the field of mechanical engineering seals, and in particular relates to an anti-leakage magnetic fluid seal structure. Background technique [0002] The existing magnetic fluid sealing structure generally includes a housing with a hollow cavity, a shaft, and a permanent magnet and a pole piece are arranged between the shaft and the housing for magnetic fluid sealing. The defective of prior art mainly shows in the following aspects: [0003] 1. The existing sealing gap is generally located in the radial direction, and the seal in the axial direction is realized after being filled with magnetic fluid, and the sealing pressure resistance performance is not good enough. [0004] 2. Since the traditional structure only has a radial gap, the flow resistance of the magnetic fluid is small, and the risk of leakage along the axial direction is large. The leakage of the magnetic field in the magnetic fluid seal will lead to a decrease i...

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Problems solved by technology

[0003] 1. The existing sealing gap is generally located in the radial direction, and the sealing in the axial direction is realized after filling the magnetic fluid, and the sealing pressure resistance performance is not good enough

[0004] 2. Since the traditional structure only has a radial gap, the flow resistance of the magnetic fluid is small, and the risk of leakage along the axial direction is large. The leakage of the magnetic field in the magnetic fluid seal will lead to a decrease in the magnetic field strength in the magnetic circuit, so that the resistance of the magnetic fluid seal Reduced pressure performance

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