Patent ID: 7670120
Filing Date: 2010-03-02
Classification: F04C,Y10S

Abstract:
1. A cooling spiral compressor, comprising: a sealed enclosure containing a suction volume and a compression volume placed respectively on the side of the two ends of the enclosure on either side of a body, the enclosure comprising a refrigerant gas inlet, an electric motor placed on the suction side having a stator and a rotor fixedly attached to a drive shaft in the form of a crankshaft, the drive shaft comprising an out-of-alignment lubrication duct extending over the whole length of the drive shaft, supplied by oil contained in a casing situated in the bottom portion of the enclosure by an oil pump placed at a first end of the shaft, the lubrication duct comprising lubrication orifices at different guide bearings of the shaft, the second end of the drive shaft being fitted with a device for driving the movable spiral of the compressor in an orbital motion, wherein the drive shaft comprises a return duct parallel or inclined relative to the axis of the shaft and extending over at least a portion of the length of the shaft, one of the ends of the return duct opening into the wall of the shaft, in the zone of the shaft situated beyond the rotor, on the side of the oil casing, means being provided for placing the lubrication and return ducts in fluidic communication.