Fluid-solid coupled gas shock wave adjusting bearing

Abstract

The invention relates to a fluid-solid coupled gas shock wave adjusting bearing. At present, a widely used dynamic pressure foil-bearing is limited in carrying capacity and lacks of stability and the coating process requirements on the surface of a foil are high, and a static pressure-dynamic pressure mixed bearing is insufficient in carrying capacity at a slow rotating speed while is pneumatically unstable at a high rotating speed. The bearing provided by the invention comprises a bearing bush (1) which is provided with air supply throttling orifices (3), damping cavities (4) are arranged in the outlet positions of the air supply throttling orifices, one or more than one row of air supply throttling orifices and the damping cavities is uniformly distributed circumferentially on the inner surface of the bearing bush, and foil structures (7) are arranged between the outlets of the damping cavities and a rotor (2); the foil structures comprises bump foils (6) and flat foils (5). By changing the air supply pressure of the bearing, the throttling orifice structures and the damping cavity structures, the fluid-solid coupled gas shock wave adjusting bearing can be matched with a large-gap high-load bearing working condition. The invention is the fluid-solid coupled gas shock wave adjusting bearing.

Description

[0001] Technical field: [0002] The invention relates to a gas bearing, in particular to a fluid-solid coupling type gas shock wave regulating bearing. [0003] Background technique: [0004] The gas bearing uses gas with low viscosity and small temperature change, clean and pollution-free, radiation resistance, and good compressibility as the lubricating medium. It has the advantages of low power consumption, long life and high precision. However, due to the low viscosity and Compressibility and other characteristics inhibit the application of bearings in heavy-duty areas. [0005] At present, the widely used dynamic pressure foil bearings and static pressure-hydrodynamic and static pressure hybrid bearings still have some problems. For example, the main problem of foil bearings is the limited carrying capacity, especially in the start-stop process and external disturbances, their stability Insufficient performance and high requirements for the coating process on the surface of the ...

AI Technical Summary

Problems solved by technology

[0004] Gas bearings use low-viscosity gas with small temperature changes, clean and pollution-free, radiation-resistant, and good compressibility as the lubricating medium. It has the advantages of low power consumption, long life, and high precision. However, due to the low viscosity of the gas and Features such as compressibility inhibit the application of bearings in heavy load areas

[0005] The dynamic pressure foil bearings and static pressure-dynamic and static pressure hybrid bearings that have been widely used at present still have some problems. Insufficient performance, high requirements on foil surface coating process, and complex foil structure. For static pressure-dynamic and static pressure hybrid bearings, when the gas supply pressure of the bearing is continuously increased, the gas will be congested when the throttle flows into the bearing gap. And in the bearing gap, complex flow field characteristics such as subsonic flow, supersonic flow and even shock wave appear, which cause pressure loss in the supersonic region and reduce the bearing capacity and stability of the bearing. Insufficient and aerodynamic instability at high speeds

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