Variable displacement compressor

A variable displacement compressor for compressing refrigerant gas that contains lubricant, wherein the compressor compresses the refrigerant gas supplied from a suction chamber to a compression chamber and sends the compressed refrigerant gas to a discharge chamber when a drive shaft rotates, wherein the displacement of the compressor varies in accordance with the pressure in a control chamber located in a compressor housing, and wherein the compressor has a supply passage for supplying the refrigerant gas from the discharge chamber to the control chamber and a bleed passage for bleeding the refrigerant gas from the control chamber to the suction chamber, the compressor comprising:

• a separator, which is located in the bleed passage, wherein the separator rotates together with the drive shaft to centrifugally separate the lubricant from the refrigerant gas that flows in the bleed passage;
• a lubricant chamber, which is formed in the housing, wherein the lubricant chamber receives the separated lubricant, and the pressure in the lubricant chamber is equal to or greater than the pressure in the control chamber;
• and
• a return passage, which is formed in the housing, wherein the return passage returns the lubricant from the lubricant chamber to the control chamber.