Bearing for air refrigerating machine driven by high-speed motor and the air refrigerating machine

Abstract

The invention discloses a bearing for an air refrigerating machine driven by a high-speed motor, comprising two elastic support permanent-magnet and air dynamic pressure mixing radial bearings, a permanent magnet and air hydrostatic mixing thrust bearing set, and two self-adaptive refrigerating machine attitude change permanent magnet radial unloading follow-up auxiliary bearings, wherein two radial bearings are disposed on a rotor shaft between the center position of a left bearing pedestal and a right bearing pedestal of a motor housing and the housing, the thrust bearing set and one follow-up auxiliary bearing are both disposed on the rotor shaft between the center position of a turbine heat-insulation cover and the housing, the heat-insulation cover is connected with a left bearing pedestal, another follow-up auxiliary bearing is disposed on the rotor shaft between the center position of the right bearing pedestal outside and the housing, and the right bearing pedestal is connected with a gas compressor. The high-speed motor-driven air refrigerating machine-used bearing integrates the respective advantages of the permanent magnets and gas-lubricated bearings in one bearing, helps to overcome the problem of bearing solid friction at starting and stopping stages of a high-speed motor, is long in service life, and is high in reliability.

Description

Technical field [0001] The present invention relates to a bearing for a rotating machine driven by a high-speed motor, in particular to a bearing for an air refrigerator, an air compressor, etc., driven by a large-capacity high-speed motor, which is installed on a transportation tool, a vehicle, etc. The rotor rotates at a high speed not less than tens of thousands of revolutions per minute, for example. Background technique [0002] One of the main technical problems in the design of air refrigerators and air compressors driven by high-power, high-speed high-speed motors (20kw, 50000 / min or more) is the bearing design. At present, the design of such high-power, high-speed motor bearings generally considers the use of active magnetic bearing support methods with electromagnetic bearings as the main support and rolling bearing protection, but the electrical control and manufacturing of such magnetic bearings are complicated, expensive and reliable. Low, and the service life is st...

AI Technical Summary

Problems solved by technology

At present, the design of such high-power, high-speed motor bearings generally considers the use of electromagnetic bearings as the main support and active magnetic bearing support for rolling bearing protection, but the electronic control and manufacturing of this magnetic bearing is complex, expensive and reliable. It is relatively low, and its service life is still affected by rolling bearings, so it cannot be commercialized at present; liquid sliding bearings are basically unusable due to the large friction loss when the motor rotates at high speed; It is very small, and the solid friction during the start-stop phase of the motor is inevitable, so the reliability and service life are low. In addition, if it is applied to vehicles, the problems of vibration and dust are serious. So far, this kind of bearing has not been used in domestic projects. Practical stage

At present, this kind of bearing is only used in the turbo refrigerators of mainline airliners and fourth-generation fighters such as F35 and S37, as well as the small gas turbine generators on the ground in a few developed countries in foreign countries; The application of the device in transportation is greatly restricted; the use of composite ceramic ball angular contact ball bearings as this kind of high-power, high-speed motor bearings, due to the short service life, has not yet been reported in China

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