Rotary hermetic compressor and refrigeration cycle system

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
• means for 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 of the branch pipe and in a suction pipe section inside the accumulator.

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 an intra-casing pressure guided into the vane chamber and a suction pressure or discharge pressure guided to the cylinder chamber, and
• means for 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 and another end connected to a refrigerant pipe on a side upstream of a second accumulator;
• and
• an on-off valve or a check valve provided in the suction pipe on a side upstream of a connection portion of the branch pipe and in a suction pipe section inside the accumulator.