Patent ID: 8186979

Claim:
A capacity variable type rotary compressor, comprising: a casing that contains a certain amount of oil and maintains a refrigerant at a discharge pressure in an inner space of the casing and having a discharge pipe that communicates with the inner space; a motor installed in the inner space of the casing that generates a driving force; a first cylinder installed in the inner space of the casing, having a first compression space to compress the refrigerant, and having a first inlet that supplies the refrigerant at a suction pressure to the first compression space; a second cylinder installed in the inner space of the casing positioned at one side of the first cylinder, having a second compression space to compress the refrigerant separately from the first compression space of the first cylinder, and having a second inlet that supplies the refrigerant at a suction pressure to the second compression space; an upper bearing installed at an upper side of the first cylinder such that the upper bearing covers the upper side of the first cylinder, and having a first outlet that communicates with the first compression space; a lower bearing installed at a lower side of the second cylinder such that the lower bearing covers the lower side of the second cylinder, and having a second outlet that communicates with the second compression space; a middle bearing that separates the first and second cylinders from each other; a first rolling piston that performs an orbit motion in the first compression space of the first cylinder; a second rolling piston that performs an orbit motion in the second compression space of the second cylinder; a first vane coupled to the first cylinder that performs a linear motion by contacting the first rolling piston; a second vane coupled to the second cylinder that performs a linear motion by contacting the second rolling piston; a vane pressure chamber formed in the second cylinder at a rear side of the second vane in the inner space of the casing, and sealed by the lower and middle bearings such that the vane pressure chamber is separated from the inner space of the casing; a mode switching device that selectively supplies a suction pressure or a discharge pressure to the vane pressure chamber of the second cylinder according to a driving mode; an accumulator fixed to the casing; and a connection device that couples the mode switching device to an outer circumferential surface of the accumulator, wherein a hole is formed in the lower bearing that communicates with the vane pressure chamber via an oil supply valve that opens or closes the hole to supply the oil of the casing to the vane pressure chamber.