Patent ID: 7621722

Claim:
A rotor of a compressor comprising: a stack formed by stacking a plurality of discs; at least one gaseous refrigerant passage vertically penetrating the stack having an inner wall, said inner wall comprising a portion nearest an outer circumference of the stack and another portion nearest an inner circumference of the stack; an end cover mounted on the upper side of the stack and another end cover mounted on the lower side of the stack, wherein each end cover comprises penetrating holes aligned with said at least one gaseous refrigerant passage; an oil leakage prevention device having a prevention plate vertically positioned in the at least one gaseous refrigerant passage for preventing oil from passing through and leaking out of the stack, wherein the prevention plate is in full contact with the portion of the inner wall of the at least one gaseous refrigerant passage nearest the outer circumference of the stack and only partially contacts the portion of the inner wall of the at least one gaseous refrigerant passage nearest the inner circumference of the stack, and wherein the oil leakage prevention device is removable from the at least one gaseous refrigerant passage; and an upper insulation block and a lower insulation block, each comprising a through hole aligned with the corresponding penetrating hole of its respective end cover, the upper and lower insulation blocks being inserted into the at least one gaseous refrigerant passage and respectively contacting the upper and lower sides of the prevention plate via at least two supporting steps formed on the respective upper and lower insulation blocks.