A Centrifugal Compressor Using Hydrostatic Hybrid Radial Gas Bearings

Abstract

The invention discloses a centrifugal compressor using a static and dynamic pressure mixed radial gas bearing, and relates to the technical field of centrifugal compressor design. The centrifugal compressor using the static and dynamic pressure mixed radial gas bearing comprises a shell, radial bearings, stators and a rotor, wherein the radial bearings are fixedly arranged in the shell; a boss A and wave foils A are arranged on inner rings of the radial bearings; the wave foils A are arranged on two sides of the boss A; a top foil A is arranged above the wave foils A; the height of the boss Ais lower than the height of the working surface of the top foil A; a through hole A penetrating the radial bearings is formed in the boss A; an air supply channel corresponding to the through hole A is arranged on the shell; the stators are arranged in the shell; and the rotor is rotatably arranged in the radial bearings and corresponds to the stators. The centrifugal compressor using the static and dynamic pressure mixed radial gas bearing has the beneficial effects that friction and abrasion between the top foil of a dynamic pressure bearing and a rotating shaft in the starting process and the load changing process can be reduced through the matching use of the static and dynamic pressure bearing, and the service life of the compressor is prolonged.

Description

technical field [0001] The invention relates to the technical field of centrifugal compressor design, in particular to a centrifugal compressor using static and dynamic pressure hybrid radial gas bearings. Background technique [0002] Centrifugal compressors need high speed to achieve high speed and miniaturization. Oil-lubricated rolling bearings and sliding bearings cannot run at high speeds, which is the main technical bottleneck for high-speed compressors. Gas bearings have the characteristics of high-speed and stable operation, and are the core technology for high-speed compressors. [0003] In recent years, gas bearing technology has gradually begun to be applied to centrifugal compressors. There are two types of gas bearings: static pressure gas bearings and dynamic pressure gas bearings. The static pressure gas bearing has a stable start-stop process and a large carrying capacity, but its stability at high speed is poor (air hammer), and a stable external air supp...

AI Technical Summary

Problems solved by technology

The static pressure gas bearing has a stable start-stop process and a large carrying capacity, but its stability at high speed is poor (air hammer), and a stable external air supply is required; the dynamic pressure gas bearing has high stability under high-speed conditions and does not require an external supply Gas, but its start-stop process will cause damage to the bearing surface, there is a certain limit of start-stop times, which affects the use of the compressor

[0004] Existing static pressure gas bearings require an external supply of high-pressure gas, and the supporting equipment is complex and costly, and there is a friction phenomenon during the start-stop process, which requires high friction and wear performance of the bearing material and ultimately affects the life of the bearing.

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