Double-coating magnetic liquid sealing device

Abstract

The invention discloses a double-coating magnetic liquid sealing device. The sealing device comprises a shell, a rotating shaft, a first pole shoe, a second pole shoe and a first permanent magnet, wherein a shaft chamber is formed in the shell; the rotating shaft is rotationally arranged in the shaft chamber; a first non-magnetic coating is arranged on the outer circumferential surface of the rotating shaft; the first pole shoe and the second pole shoe are arranged on the rotating shaft in a sleeving mode and are arranged at intervals in the axial direction of the rotating shaft; second non-magnetic coatings are arranged on the inner circumferential surface of the first pole shoe and the inner circumferential surface of the second pole shoe; the first permanent magnet is arranged on the rotating shaft in a sleeving mode; the first permanent magnet is located between the first pole shoe and the second pole shoe; a first liquid cavity is formed among the first pole shoe, the second poleshoe, the first permanent magnet and the first non-magnetic coating; and the first liquid cavity is used for storing magnetic liquid. According to the double-coating magnetic liquid sealing device, the machining difficulty and cost are reduced, the magnetic liquid can be supplemented in time, the pressure resistance of the magnetic liquid sealing is maintained, the magnetic liquid further has a lubricating effect, and the torsion moment of the magnetic liquid sealing is reduced.

Description

technical field [0001] The invention relates to the technical field of sealing, in particular to a double-coated magnetic liquid sealing device. Background technique [0002] Magnetic liquid seal is a kind of characteristic that utilizes magnetic liquid to be attracted by a magnetic field. By designing a suitable magnetic circuit, the sealing method that makes the magnetic liquid form a liquid "O" ring in the sealing gap is widely used in harmful and dangerous gases, etc. Sealed environments with stringent leak rate requirements. [0003] As a kind of fluid, magnetic fluid can also play the role of lubrication under the condition of choosing a suitable base carrier fluid. Therefore, using the magnetic liquid as a lubricant can design the magnetic gap to be smaller, and reducing the magnetic gap can greatly improve the pressure resistance of the magnetic liquid seal. [0004] However, in the related art, the smaller the magnetic gap, the higher the processing difficulty and...

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Problems solved by technology

[0004] However, in the related art, the smaller the magnetic gap, the higher the processing difficulty and cost

And because the gap of the magnetic liquid seal is small, the amount of magnetic liquid that can be added each time is limited. When the temperature of the sealing working condition is high, or the spindle rotation speed is too fast, the magnetic liquid is prone to loss, and the magnetic liquid needs to be replenished frequently, which affects production efficiency.

Moreover, due to the lack of liquid storage parts, a large amount of external liquid supply is required to achieve effective lubrication, and the utilization rate is low

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