Magnetic liquid for improving pressure resistance capability in case of magnetic liquid seal

Abstract

The invention discloses magnetic liquid for improving pressure resistance capability in the case of magnetic liquid seal, belonging to the technical field of mechanical engineering seal and being particularly applicable to magnetic liquid seal. The magnetic liquid is prepared by adding 1 mu m-50 mu m of nonmagnetic solid particles the volume of which is 9%-11% of that of the magnetic liquid to the existing magnetic liquid and then stirring for 30-40 minutes. The nonmagnetic solid particles comprise silicon oxide powder or aluminum oxide powder, and the existing magnetic liquid comprises diester-based magnetic liquid or kerosene-based magnetic liquid. By using the magnetic liquid in the invention, the problem that the pressure resistance capability of the magnetic liquid is reduced caused by unevenly distributed magnetic solid particles in the existing magnetic liquid is solved.

Description

technical field [0001] The invention belongs to the technical field of mechanical engineering sealing, and is especially suitable for magnetic liquid sealing. Background technique [0002] In the magnetic liquid sealing device, the sealing gap usually formed by the pole piece and the shaft is between 0.1 mm and 0.2 mm. Under the action of the magnetic field, the magnetic liquid is filled in the sealing gap. At this time, the ferromagnetic particles of nanometer scale in the magnetic liquid can be stably suspended for a long time and uniformly dispersed in the base carrier liquid, so that the sealing device has good pressure resistance. [0003] However, in some special devices, the rotational speed of the rotating shaft is as high as tens of thousands of revolutions per minute, so it is inevitably accompanied by slight radial vibration, which requires a large gap between the rotating shaft and the pole teeth to avoid The vibration of the rotating shaft causes the pole teet...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in the magnetic liquid sealing device, when the sealing gap between the pole shoe and the shaft is greater than 0.5mm (generally less than 1mm), the ferromagnetic solid particles of the nanometer level in the magnetic liquid will be affected by the inhomogeneous magnetic field. Downward segregation, resulting in uneven distribution of magnetic solid particles, resulting in a decrease in the pressure resistance of the magnetic liquid

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