A multi-stage, in-line, foil gas dynamic pressure bearing and rotor assembly

Abstract

The application discloses a multistage series foil gas dynamic pressure bearing and rotor assembly, and relates to the technical field of gas bearings. The bearing aims at solving the problem of complex processing of traditional wave foils, and comprises a bearing sleeve and at least two superposed foil assemblies. Each assembly comprises a top foil and a plurality of supporting units. The supporting units of the upper assembly are in surface contact with the top foil of the lower assembly and correspond to the gaps of the supporting units, so as to form a multistage series elastic supporting structure, replacing the integrally formed wave foil. The structure can be formed by welding simple plane foils and then curling, greatly simplifying the processing and assembly. In addition, the application applies the above-mentioned bearing to a rotor assembly, directly uses the back surface of an impeller as a thrust surface to cooperate with a thrust bearing, cancels an independent thrust disc, and is beneficial to the stability of a rotor system and the miniaturization of equipment.

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