Motor front bearing, and centrifugal compressor and refrigeration device comprising motor front bearing

Abstract

The invention provides a motor front bearing, and a centrifugal compressor and a refrigeration device comprising the motor front bearing. The motor front bearing comprises a front bearing bush (11) and a front bearing positioning part (12) which is provided with a front bearing main oil supply channel (121) along a radial direction. The front bearing bush (11) comprises a front bearing radial oil supply channel (112) radially penetrating the front bearing bush (11) and a front bearing peripheral oil supply groove (115) arranged at an outlet of the front bearing radial oil supply channel (112). The front bearing radial oil supply channel (112) comprises front bearing lateral oil supply channels laterally extending to the two ends of the front bearing bush (11). With the motor front bearing provided by the invention, bearing oil supply manner can be improved, radial bearing and thrust bearing temperature fields can be unified, thrust surface oil film dynamic pressure state can be stabilized, and oil film lubrication stability can be improved.

Description

technical field [0001] The invention relates to the field of air conditioning, in particular to a motor front 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 temperatu...

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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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