Thrust foil dynamic pressure air bearing with thick top foil structure

Abstract

The invention relates to a thrust foil dynamic pressure air bearing with a thick top layer foil structure. The thrust foil dynamic pressure air bearing comprises a bottom plate (1), supporting wave foils (2) and top foil sheets (3), wherein the round bottom plate (1) are arranged on the lower part, the plurality of fan-shaped top foil sheets (3) are fixed above the bottom plate, and the supportingwave foils (2) are assembled on the bottom plate (1) and the top foil sheets (3); the bearing is characterized by further comprising inlet section gaskets (4) are arranged on one side in the radial direction of the joint of the top foil sheets (3) and the bottom plate (1), and the thickness of the inlet section gaskets (4) is adjustable; and the thickness of the top foil sheets is 0.5 mm to 1 mm,the support wave foils (2) and the top foil sheets are assembled in a pre-tightening mode, and the shape variable of the supporting wave foils is 0.01 mm-0.02mm. On one hand, the requirement for theconsistency precision of the foil bearing on the support wave foils is lowered, and meanwhile, the problem of foil deformation of the inlet sections of the top foil sheets of the thrust bearing is solved, so that the thickness shape of the gas film of the inlet section is basically unchanged, and the bearing capacity of the bearing is improved.

Description

technical field [0001] The invention relates to the technical field of air bearings, in particular to a thrust foil dynamic pressure air bearing with a thick top foil structure. Background technique [0002] Foil air bearing is a self-acting dynamic pressure air bearing using air as the lubricating medium. It was first applied in the environmental control system (ACM) of aircraft in the 1970s, and gradually extended to small turbojet engines in the 1980s and 1990s. In the 21st century, it has been further applied and developed in the fields of air suspension centrifugal blower, electronic turbocharger and hydrogen fuel cell compressor. Compared with traditional high-speed bearings, foil air bearings have the advantages of simple structure, high speed, low friction power consumption, high and low temperature resistance, good stability and convenient maintenance, etc., and have broad application prospects in the field of high-speed rotating machinery in the future. [0003] T...

AI Technical Summary

Problems solved by technology

At present, the thickness of the top foil of the thrust foil gas bearing is mostly 0.1mm-0.2mm. In order to improve the performance of the bearing, the accuracy of the processing consistency of the support wave foil must be improved, which increases the complexity of the process and the processing cost; at the same time The thickness of the top layer foil is not enough, under the effect of air film compression, it will also cause the shape of the air film thickness distribution in the inlet section to change, which will weaken the compression effect of the wedge-shaped air film and reduce the bearing capacity of the bearing

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