Gas bearing, compressor and air conditioning unit

Abstract

The invention relates to a gas bearing, a compressor and an air conditioning unit. The gas bearing comprises a shell, a top foil assembly, and at least three corrugated bump foil assemblies, wherein the shell is provided with a shaft hole for a rotating shaft to pass through, the top foil assembly is inserted in the shaft hole, a cavity used for allowing the rotating shaft to penetrate through is defined by the top foil assembly, the top foil assembly comprises at least two flat top foils, and the top foils are stacked in the radial direction of the shaft hole in a mutually matched mode, the corrugated bump foil assemblies are arranged between the hole wall of the shaft hole and the top foil assembly and support the top foil assembly, the bump foil assemblies are opposite end to end and surround the periphery of the top foil assembly to form an annular structure, and each bump foil assembly comprises at least two bump foils which are stacked in a mutually matched manner. The bearing capacity of the gas bearing can be improved.

Description

[0001] This disclosure is based on the application with CN application number 202010207494.6 and the application date is March 23, 2020, and claims its priority. The disclosure content of this CN application is hereby incorporated into this application as a whole. technical field [0002] The invention relates to the technical field of bearings, in particular to a gas bearing, a compressor and an air conditioner unit. Background technique [0003] Gas bearings can use gaseous medium to suspend the shaft, and have a series of advantages such as oil-free, high speed, small vibration, and high temperature resistance. [0004] The working principle of the related foil dynamic pressure gas bearing is that the rotating shaft is eccentric relative to the bearing under the action of gravity, and then forms a wedge-shaped gap with the inner surface of the bearing. When the rotating shaft rotates at high speed, it continuously brings gas with a certain viscosity into the wedge-shaped ...

AI Technical Summary

Problems solved by technology

The above-mentioned process of gas film generation is called dynamic pressure effect, and the formation speed of the dynamic pressure effect of traditional gas bearings is generally relatively slow, which is not conducive to the application of gas bearings in the field of air conditioning

[0005] The carrying capacity and damping of related foil dynamic pressure gas bearings are too small, resulting in high rotor take-off speed, low critical speed, and excessive vibration, which greatly limits the application of foil dynamic pressure gas bearings in the field of refrigeration

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