An air bearing system supporting a high-speed and small-length-diameter-ratio micro-rotor

Abstract

The invention provides an air bearing system for supporting micro-rotors with a high rotation speed and small length-diameter ratio. The system comprises a miniature centripetal turbine rotor, radial air bearings, a front anti-thrust air bearing, a rear anti-thrust air bearing and a matched air path system, wherein the miniature centripetal turbine rotor is driven by radial incoming flow to rotate at a high speed; the radial air bearings are four ways of independent air-supply double-row throttling seam radial air bearings; the anti-thrust air bearings are in a static and dynamic pressure combined mode; the static-pressure anti-thrust bearing acts during starting and low-speed rotation; the spiral groove dynamic-pressure anti-thrust bearing acts during high-speed rotation. The miniature air bearing system is simple in structure and high in deflection rigidity, provides enough supporting height and stability for ultra-high rotation speed work while guaranteeing stable low-speed starting of the micro-rotors, and can provide supporting for the various micro-rotors with the high rotation speed and small length-diameter ratio in multiple fields.

Description

technical field [0001] The invention relates to the technical field of miniature air bearing systems, in particular to an air bearing system supporting a micro rotor with high rotational speed and small aspect ratio. Background technique [0002] Air bearings have many characteristics such as no friction, no pollution, small resistance, stable chemical properties, high motion precision, simple structure, and convenient processing. It has obvious advantages when the micro-rotor with small aspect ratio and compact structure provides support. [0003] At present, air bearings can be divided into static pressure air bearings and dynamic pressure air bearings according to different working principles. The supporting force is provided by the gas dynamic pressure generated by the high-speed movement of the gas driven by the rotating parts. Static pressure air bearings need extremely high external supply air pressure to provide sufficient bearing capacity at high speeds; dynamic p...

AI Technical Summary

Problems solved by technology

Static pressure air bearings need extremely high external supply air pressure to provide sufficient bearing capacity at high speeds; dynamic pressure air bearings have extremely low bearing capacity when the rotor starts or the speed is low, which may cause the rotor to rub or even fail to start normally

For micro-rotors with small aspect ratios that need to work at ultra-high speeds, neither static pressure nor dynamic pressure air bearings can meet the demand

For micro-rotors with small length-to-diameter ratios, weak air disturbances may cause radial deflection vibrations of the rotors, affecting the stable rotation of the micro-rotors. In severe cases, the micro-rotors may be severely rubbed, stuck or even fragmented. Therefore, Improving the radial deflection stiffness is the key and difficult point in the design of the small length-to-diameter ratio micro-rotor support system

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