Rear bearing of motor as well as centrifugal compressor and refrigeration equipment comprising same

Abstract

The invention provides a rear bearing of a motor as well as a centrifugal compressor and refrigeration equipment comprising the same. The rear bearing of the motor comprises a rear bearing bush and a rear bearing bush locating piece, wherein the rear bearing bush locating piece comprises a main oil supply channel of the rear bearing; the inner wall of the rear bearing bush locating piece is provided with a rear bearing parallel oil supply distributing groove connected with the main oil supply channel of the rear bearing along the circumferential direction; and the rear bearing bush comprises a rear bearing radial-direction oil supply channel arranged along the radial direction, and a rear bearing lateral-direction oil supply channel, wherein the rear bearing lateral-direction oil supply channel is communicated with the rear bearing parallel oil supply distributing groove and extends to the end part of the first end of the rear bearing bush. According to the rear bearing of the motor, which is disclosed by the invention, the bearing oil supply mode can be improved, a radial-direction bearing and thrust bearing temperature field can be balanced, the dynamic pressure state of a thrust surface oil film is stabilized, and the oil film lubrication stability is improved.

Description

technical field [0001] The invention relates to the field of air conditioning, in particular to a motor rear bearing, a centrifugal compressor and refrigeration equipment including the bearing. Background technique [0002] In the direct-coupled variable frequency centrifugal compressor, due to the cancellation of the gear speed-up structure, all axial and radial forces act on the front and rear bearings of the motor, and the load on the bearings is much greater than that of the bearing with the gear speed-up structure. Therefore, the oil supply and lubrication of bearings are more important. [0003] The sliding bearings of conventional centrifugal compressors adopt the method of circumferential oil supply or axial oil supply, and oil is supplied to both ends through the main oil supply groove in the middle. For bearings with thrust structure, the lubricating oil often passes through the radial part and then enters the thrust structure. This will often cause the temperatur...

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Problems solved by technology

[0003] The sliding bearings of conventional centrifugal compressors adopt the method of circumferential oil supply or axial oil supply, and oil is supplied to both ends through the main oil supply groove in the middle. For bearings with thrust structure, the lubricating oil often passes through the radial part and then enters the thrust structure. This will often cause the temperature of the oil entering the thrust surface to be very high, coupled with the temperature rise of the thrust surface, the oil temperature is likely to exceed the allowable temperature of the bearing pad material and fail; in addition, due to the high temperature of the oil entering the thrust surface, resulting in The viscosity of the lubricating oil decreases, and the dynamic pressure formed by the oil film decreases, which cannot meet the design point requirements, and eventually the bearing bush is worn due to insufficient dynamic pressure of the oil film.

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