Magnetic liquid sealing device

Abstract

The invention discloses a magnetic liquid sealing device. The magnetic liquid sealing device comprises a casing, a rotating shaft, a plurality of pole pieces, a detection assembly and a permanent magnet. The casing is provided with a cavity, and the rotating shaft is rotatably arranged at In the chamber, the pole pieces are arranged at intervals in the axial direction of the rotating shaft, the pole pieces are sleeved outside the rotating shaft, and the inner peripheral surface of the pole piece and the outer peripheral surface of the rotating shaft are on the rotating shaft. are spaced apart in the radial direction to form a sealing gap, the sealing gap has a magnetic liquid in it, the pole piece is provided with a plurality of detection holes along the radial direction of the rotating shaft, and the detection component includes a probe, and the probe is provided in the The detection hole is used to detect the amount of magnetic liquid in the sealing gap, the permanent magnet is sleeved outside the rotating shaft, and the permanent magnet is arranged between the adjacent pole pieces in the axial direction of the rotating shaft. between. The magnetic liquid sealing device of the invention has the characteristics of simple structure, strong reliability and real-time monitoring of liquid distribution.

Description

technical field [0001] The invention relates to the technical field of mechanical engineering sealing, in particular to a magnetic liquid sealing device. Background technique [0002] At present, when the magnetic liquid seal is used, the distribution of the magnetic liquid in the sealing gap is uneven due to the loss of the magnetic liquid, and the sealing gap of the magnetic liquid seal is very small, generally only 0.1mm to 0.3mm, so it is impossible to directly measure the distribution of the magnetic liquid. It is observed that insufficient magnetic fluid between the rotating shaft and the pole teeth will lead to the failure of the magnetic fluid seal and even the damage of the rotating shaft. SUMMARY OF THE INVENTION [0003] The present invention is made based on the inventors' findings and understanding of the following facts and problems: [0004] As the working life of the device increases, the magnetic liquid is seriously worn, which will cause the magnetic liq...

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Problems solved by technology

[0002] At present, when magnetic liquid seals are used, due to the loss of magnetic liquid, the distribution of magnetic liquid in the sealing gap is uneven, and the sealing gap of magnetic liquid seals is very small, generally only 0.1mm ~ 0.3mm, and it is impossible to directly measure the distribution of magnetic liquid. Observation, lack of magnetic fluid between the shaft and the pole teeth will lead to failure of the magnetic fluid seal and even damage to the shaft

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