Static pressure gas bearing

Abstract

The invention discloses a static pressure gas bearing comprising a bearing base body and an air-supply hole loop. Air-supply holes on the air-supply hole loop adopt a mode of loop surface throttling; the air-supply hole loop is divided into a plurality of independent regions along the circumferential direction, the diameters of the air-supply holes in all the regions are different; every region has an independent air-supply passage; every air-supply passage is connected with an industrial personal computer via an electric proportional valve and an amplifier; and the industrial personal computer sends a control signal to the amplifier according to a rotor operation condition detected by a displacement transducer to adjust air-supply pressure. The air-supply holes on the air-supply hole loop adopt a reversely tangential air-supply mode or a vertical air-supply mode. The pressure distribution in a flow field is changed because the diameters of the air-supply holes are different, therefore, the rigidity characteristic of the bearing in different directions is changed and the rigidity anisotropy of the bearing is realized. The system stability can be effectively improved due to rigidity anisotropy when the diameters of the air-supply holes in different regions are reasonably matched.

Description

technical field [0001] The invention relates to a bearing manufacturing technology, in particular to a static pressure gas bearing. Background technique [0002] Gas bearing is a sliding bearing that uses gas as lubricant. Compared with traditional rolling bearings or oil film lubricated bearings, gas hydrostatic bearings have the following advantages: (1) Small friction, low energy consumption, and long life. The viscosity of the gas is only on the order of one-thousandth of that of lubricating oil, so its friction loss is extremely low, which greatly improves the working performance of high-speed machinery; (2) Due to the homogenization effect of the gas film, the operation is smooth and the precision is high. It can guarantee high rotation accuracy and can be used in precision equipment, computer magnetic heads and other fields; (3) It has good performance in high and low temperature resistance, and strong radiation resistance; because the viscosity of gas is much less af...

AI Technical Summary

Problems solved by technology

[0003] At present, the static pressure gas bearing generally adopts uniform air supply hole diameter and uniform air supply pressure, and the stability of the gas bearing is relatively poor when it is running at high speed

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