Multi-stage multi-pole magnetic powder sealing device

Abstract

The invention discloses a multi-stage multi-pole magnetic powder sealing device, which comprises a casing, a reciprocating shaft, a first pole piece, a second pole piece, a permanent magnet and a sealing assembly. The reciprocating shaft runs through the casing, and the sealing assembly is arranged inside the casing and sleeved on the outside of the reciprocating shaft. The sealing assembly is located on the side of the first pole piece away from the permanent magnet and / or on the side of the second pole piece away from the permanent magnet. The sealing assembly includes a guide The magnetic ring and the side teeth, the side teeth are arranged on the inner peripheral wall of the magnetic conduction ring, and there is a preset gap between the inner peripheral surface of the side teeth and the outer peripheral surface of the reciprocating shaft, and the magnetic conduction ring has a magnetic field that can be switched on and off, so that The scattered magnetic powder on the reciprocating shaft is filled into a preset gap to seal the side teeth and the reciprocating shaft. The multi-stage multi-pole magnetic powder sealing device of the embodiment of the present invention forms a multi-stage multi-pole seal by setting the sealing assembly, which improves the pressure resistance of the sealing device, and can also supplement the magnetic powder in the sealing gap, and the sealing performance of the sealing device is declining. recovered afterwards.

Description

technical field [0001] The invention relates to the field of sealing technology, in particular to a multi-stage multi-pole magnetic powder sealing device. Background technique [0002] Magnetic powder sealing is a sealing form in which magnetic particles are the main body, and micro-nano magnetic powder (hereinafter referred to as "magnetic powder") formed after modification by surfactants and lubricants is used as the sealing medium. Magnetic powder sealing is a new high-performance sealing technology. Compared with traditional sealing methods, it has low leakage rate, strong pressure resistance, high reliability, extreme temperature resistance, and can improve the pressure resistance in specific environments through surface modification. ability and other advantages. [0003] In the related art, in the magnetic powder sealing device used for the reciprocating shaft, during the reciprocating motion of the reciprocating shaft, part of the magnetic powder adheres to the reci...

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Problems solved by technology

[0003] In the related art, in the magnetic powder sealing device used for the reciprocating shaft, during the reciprocating motion of the reciprocating shaft, part of the magnetic powder adheres to the reciprocating shaft and is taken away from the sealing gap. As the working time of the reciprocating shaft increases, it is absorbed in the sealing gap. The magnetic powder in the gap is getting less and less, resulting in the reduction of the pressure resistance of the magnetic powder sealing device, the increase of the leakage rate, and even the complete loss of the sealing effect

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