Thrust air foil bearing

Abstract

The invention provides a thrust air foil bearing, and relates to the technical field of air bearings. The technical problems that a thrust foil bearing is completely scrapped after a top foil is wornin the prior art, and the bearing capacity and stability of the bearing are not ideal are solved. The thrust air foil bearing comprises a top foil module, a wave foil module, a pre-tightening module and a bearing seat, wherein the pre-tightening module, the wave foil module and the top foil module can be sequentially stacked from bottom to top and detachably and fixedly mounted on the bearing seatthrough pins, and the pins can limit the circumferential rotation of the top foil module, the wave foil module and the pre-tightening module; and the top foil module, the wave foil module, the pre-tightening module and the bearing seat can be sequentially sleeved on a rotor, a wedge-shaped space can be formed between the top foil module and a thrust disc of the rotor, and the pre-tightening module can abut against the bearing seat and provide a pre-tightening force for the thrust air foil bearing. According to the thrust air foil bearing, the production and manufacturing cost is reduced, thebearing capacity of the bearing is improved, and the stability of the bearing-rotor system is increased.

Description

technical field [0001] The invention relates to the technical field of air bearings, in particular to a dynamic pressure air bearing, in particular to a thrust air foil bearing. Background technique [0002] Air foil bearings are a kind of dynamic pressure gas bearings, which are widely used in turbomachinery such as air compressors, air cycle machines, and micro gas turbines due to their high temperature resistance, high speed, oil-free lubrication, and low friction loss. The air foil bearing uses the wedge effect. As the rotating speed of the supporting rotor increases, the gas with certain viscosity in the surrounding environment is dragged into the wedge-shaped air cavity formed by the rotor and the bearing support surface by the high-speed rotating rotor, and the rotating speed of the rotor increases. When reaching a certain speed, the gas pressure in the wedge-shaped supporting air cavity becomes larger to support the rotor. [0003] At present, the most common and wi...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a thrust air foil bearing to solve the technical problems in the prior art that the thrust foil bearing will be completely scrapped after the top foil is worn, and the bearing capacity and stability of the bearing are not ideal

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