Patent ID: 7798791
Filing Date: 2010-09-21
Classification: F01C,F04C

Abstract:
1. A capacity varying type rotary compressor, comprising: a casing that contains a certain amount of oil and a refrigerant maintained at a discharge pressure in an inner space of the casing and having a gas discharge pipe that communicates with the inner space; a motor fixedly installed in the inner space of the casing that generates a driving force; a first cylinder fixedly 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 fixedly 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 suction pressure side connection pipe connected to the second inlet by passing through the casing; a discharge pressure side connection pipe connected to the inner space of the casing by passing through the casing; a common side connection pipe connected to the vane pressure chamber by passing through the casing; a first mode switching valve connected to the suction pressure side connection pipe, the discharge pressure side connection pipe, and the common side connection pipe, that selectively connects the suction pressure side connection pipe and the discharge pressure side connection pipe to the common side connection pipe; a second mode switching valve connected to the first mode switching valve, that connects the suction pressure side connection pipe and the discharge pressure side connection pipe to the first mode switching valve to control the first mode switching valve; an accumulator fixed to the casing; and a connection device that couples the first mode switching valve to an outer circumferential surface of the accumulator.