Gas dynamic-static pressure mixing bearing system for high-speed motor and electric rotating machinery

Abstract

The invention relates to a gas dynamic-static pressure mixing bearing system for a high-speed motor. The gas dynamic-static pressure mixing bearing system is used for vertically supporting high-speed electric rotating machinery. One radial dynamic-static pressure mixing bearing is mounted on each of shaft necks of the upper end and the lower end of a motor rotor, and an axial dynamic-static pressure mixing bearing is closely mounted on the lower side of the radial dynamic-and-static pressure mixing bearing at the lower end; a rolling bearing axial support for carrying out non-contact protection on the axial bearing of the motor rotor is arranged at the bottom of the motor rotor, and finally the whole forms the gas dynamic-static pressure mixing bearing system for a high-speed motor rotor support. The high-speed electric rotating machinery of the gas dynamic-and-static pressure mixing bearing system is adopted, so that the motor rotor can realize the stable and high-speed rotation, and the effect is significant.

Description

technical field [0001] The invention relates to a gas dynamic and static pressure hybrid bearing system for a high-speed motor, in particular to a rotor support for a centrifugal air compressor, a centrifugal steam compressor, a centrifugal air refrigerator, etc. driven by a large-capacity high-speed motor, wherein the motor Rotate at a high speed of, for example, not less than tens of thousands of revolutions per minute. The invention also relates to other high-speed electric rotating machines including the aerodynamic-hydrostatic hybrid bearing system. Background technique [0002] One of the main technical problems in the design of high-power, high-speed high-speed motors (20kw, above 40000 / min) is bearing design. At present, for the bearing design of this kind of high-power, high-speed motor, it is generally considered to adopt the active magnetic bearing support method of the mixed support of electromagnetic bearing and rolling bearing, but the electronic control and m...

AI Technical Summary

Problems solved by technology

At present, for the bearing design of this kind of high-power, high-speed motor, it is generally considered to adopt the active magnetic bearing support method of the mixed support of electromagnetic bearing and rolling bearing, but the electronic control and manufacture of this magnetic bearing are complicated, expensive and reliable. Low, not yet commercialized; liquid sliding bearings have large friction losses when the motor rotates at high speed and the bearing capacity of aerodynamic sliding bearings is small, and the aerodynamic sliding bearings have wear in the start and stop stages, high manufacturing precision requirements, etc. The reason is also limited by a considerable degree of use; the use of composite ceramic ball angular contact ball bearings as this kind of high-power, high-speed motor bearings has not yet been reported in China.

Images