Patent ID: 6736607
Filing Date: 2004-05-18
Classification: F04C,Y10S

Abstract:
A compressor, comprising:a sealed outer casing defining a gas compression stage therein; the compression stage being mounted on a body; a motor positioned inside the outer casing, for driving the gas compression stage; the motor being arranged under the compression stage and being coupled to a sealed inner casing; the outer casing having a gas inlet opening and delimiting, with an assembly comprising of the body, the motor, the inner casing and the compression stage, a low-pressure zone; the body defining at least one opening for allowing lubricating oil to return to a reservoir delimited by the bottom of the outer casing; the motor being cooled by gas passing through the motor towards the compression stage; a lower part of the inner casing containing the motor being sealingly closed by a bottom; at least one chimney being arranged in an annular space formed between the outer casing and the inner casing, said chimney being arranged substantially vertically along the motor and the inner casing; the chimney being in communication with the low-pressure zone and with the inside of the inner casing; and wherein one or more openings being defined in the inner casing between the chimney and a bottom part of the motor.