An Observation Device for Micro-gap Gas Film Flow Field of Gas Static Pressure Bearing

Abstract

A gas static pressure bearing micro-gap gas film flow field observation device, including a gas source system, a bearing system and a laser observation system, the gas source system includes a compressor for generating high-pressure gas, and tracer particles for generating tracer particles A generator, and a tracer particle box for forming a high-pressure tracer particle mixed gas; the gas outlet end of the tracer particle box is connected to the bearing system through a pressure sensor; the bearing system includes a bearing thrust plate and a bearing bearing surface arranged horizontally up and down , the bearing air film gap is formed between the bearing thrust plate and the bearing bearing surface; the laser observation system includes the first beam group and the second beam group whose optical paths are perpendicular to each other, the first beam group, the bearing air film gap, the filter concave lens, the display The micro-objective lens and the high-speed camera are arranged coaxially in sequence. The invention adopts the principle of pinhole imaging, regards the outlet boundary of the air film gap of the bearing as a pinhole for imaging, and uses a filter concave lens to change the optical path into parallel light for flow field observation.

Description

technical field [0001] The invention relates to the technical field of lubricating ultra-precision gas bearings, in particular to an observation device for micro-gap gas film flow field of gas static pressure bearings. Background technique [0002] Aerostatic bearings are widely used in aerospace, precision instruments, ultra-precision machine tools and other fields. The gas film flow field of aerostatic bearing has a great influence on the performance of the bearing. However, the air film gap is very small, which is not conducive to online observation, thus affecting the in-depth study of the air film flow field characteristics. Therefore, the existing research at home and abroad basically studies the gas film flow field characteristics of aerostatic bearings from the perspective of theoretical analysis and numerical simulation, and there are very few studies based on experiments. The observation experiment of the gas film flow field of the aerostatic bearing is of great ...

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Problems solved by technology

However, since the device irradiates the flow field through a beam of laser light through the bearing surface, the material must be transparent glass or new plastics, which limit the inlet pressure, which is somewhat different from the actual gas film flow field gap

Secondly, since the laser will irradiate the particles through the bearing surface, and then let the light reflected by the particles be received and imaged through the bearing surface, the refraction of light and the loss of light intensity will occur, which will affect the imaging quality and cause distortion of the image, resulting in larger Experimental error

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