Multistage multipole magnetic powder sealing device

Abstract

The invention discloses a multistage multipole magnetic powder sealing device. The multistage multipole magnetic powder sealing device comprises a shell, a reciprocating shaft, a first pole shoe, a second pole shoe, a permanent magnet and a sealing component. The reciprocating shaft runs through the shell, and the sealing component is arranged in the shell and arranged at outside of the reciprocating shaft through sleeving; the sealing component is located at one side, far away from the permanent magnet, of the first pole shoe and / or one side, far away from the permanent magnet, of the secondpole shoe; the sealing component comprises a magnetic ring and a side tooth, the side tooth is arranged on an inner circumferential wall of the magnetic ring, moreover, a reserved gap is formed between an inner circumferential surface of the side tooth and an outer circumferential surface of the reciprocating shaft, the magnetic ring has a magnetic field capable of being turned on or off, and thus, the reserved gap can be filled with scattered magnetic powder on the reciprocating shaft and the side tooth and the reciprocating shaft can be sealed. The multistage multipole magnetic powder sealing device, provided by the embodiment of the invention, is provided with the sealing component and forms multistage multipole sealing, thus, pressure resistance of the sealing device can be improved, the magnetic powder in a sealing gap can be supplied, and airtightness can be restored after degrading.

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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