Axial magnetic suspension bearing device

Abstract

The invention provides an axial magnetic suspension bearing device. The device comprises a rotor suite, an upper axial magnetic bearing stator suite, a lower axial magnetic bearing stator suite and an assembly body, and the rotor suite comprises a shaft core and axial thrust discs which are symmetrically arranged around the shaft core; and the upper axial magnetic bearing stator suite, the lower axial magnetic bearing stator suite and the assembly body are of a central symmetry structure with the center of the shaft core as the center, and the upper axial magnetic bearing stator suite and the lower axial magnetic bearing stator suite are fixedly arranged at the two sides of the assembly body. The assembly body and the axial thrust discs are in the same horizontal direction, the upper axial magnetic bearing stator suite comprises a permanent magnet, and the permanent magnet can attract the thrust discs to enable the shaft core to move. The axial magnetic suspension bearing device replaces a coil of an upper axial magnetic bearing with the permanent magnet, the axial thrust discs have a self-holding function under the attraction effect of the permanent magnet, extra power consumption is not needed, and the problem that the upper axial magnetic bearing is seriously heated is solved.

Description

technical field [0001] The invention relates to the technical field of refrigeration and low temperature, in particular to an axial magnetic suspension bearing device. Background technique [0002] With the wide application of superfluid helium in high-energy physics, nuclear fusion, superconducting power and other fields, large-scale superfluid helium refrigeration cycle system has become an indispensable basic support facility. At present, centrifugal cold compressors are generally used in the world to pump and depressurize the helium vapor in the liquid helium storage to produce superfluid helium on a large scale. [0003] A technical solution is provided in the prior art, the cold compressor is placed vertically, the rotor is supported by two radial electromagnetic suspension bearings and one axial electromagnetic suspension bearing, and the rotating speed reaches 50krpm. The impeller and volute are at the lower end of the rotor, placed in about 3K cold box. In order t...

AI Technical Summary

Problems solved by technology

Since the upper part of the rotor is in the room temperature zone, the impeller connected to the rotor reheats quickly, while the reheating of the volute is slow, causing the impeller and the volute to freeze together, which not only affects the normal resumption of the cold compressor, but even damages the impeller and volute. shell irreversible damage

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