Patent ID: 7290994

Claim:
A rotary hermetic compressor for use in a refrigeration cycle, in which an electric motor section and a rotary compression mechanism section to be coupled to the electric motor section are accommodated, a refrigerant evaporated in a vaporizer is drawn into the compression mechanism section through an accumulator, and a refrigerant gas compressed therein is once discharged into a hermetic casing, thereby to create an intra-casing high pressure, wherein the compression mechanism section comprises: a first cylinder and a second cylinder which each includes a cylinder chamber wherein an eccentric roller is eccentrically rotatably accommodated; and vanes which are respectively provided in the first cylinder and the second cylinder wherein front end portions thereof are each compressed and urged to contact a peripheral surface of the eccentric roller to thereby bisectionally separate the cylinder chamber along a rotation direction of the eccentric roller, and vane chambers which accommodate rear side end portions of the respective vanes, the vane provided in the first cylinder is compressed and urged by a spring member disposed in the vane chamber, the vane provided in the second cylinder is compressed and urged corresponding to a differential pressure between the intra-casing pressure guided into the vane chamber and a suction pressure or discharge pressure guided to the cylinder chamber, and a guide guiding the suction pressure or discharge pressure into the cylinder chamber of the second cylinder comprises: a branch pipe having a one end connected to a high pressure side of the refrigeration cycle, an other end connected to a suction pipe communicating from the accumulator to the cylinder chamber of the second cylinder, and a first on-off valve in a midway portion; and a second on-off valve or a check valve which is provided in the suction pipe on a side upstream of a connection portion with the branch pipe and on a side downstream of an oil returning opening opened to a suction pipe section in the accumulator.