LUBRICATION OF A HERMETIC CARBON DIOXIDE COMPRESSOR

摘要

A hermetic compressor which uses carbon dioxide as the working fluid. T he compressor includes a motor and a compression mechanism operatively coupled by a drive shaft supported by a bearing. The drive shaft includes a radially extending bore in fluid communication with an oil supply passageway in the drive shaft and the outer periphery of the drive shaft. An oil accumulating cavity is located beneath the radially extending bore in which oil is stored during compressor shutdown to provide oil to bearing surfaces upon compressor startup. An oil return system includes a chamber located at one e nd of the drive shaft and an oil return passageway extending from the chamber to an annulus formed between the bearing and the drive shaft. The oil in the annulus lubricates t he bearing and drive shaft interface. A discharge tube is provided having means for aspirating oil from an oil containing sump when the oil in the oil sump reaches a particular level.