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1. Refrigeration-cycle equipment whose refrigerant circuit comprises at least a compressor, a pressure reducer, a radiator and an evaporator, and encloses a refrigerant comprising mainly carbon dioxide (CO2), whereinthe internal volume of the high-pressure-side circuit of said refrigerant circuit is less than substantially 70% of the total internal volume of said refrigerant circuit, and a predetermined vessel member is provided in the way of said high-pressure-side circuit, wherein said vessel member is a vessel having a piping cross-sectional area larg...
1. Refrigeration-cycle equipment whose refrigerant circuit comprises at least a compressor, a pressure reducer, a radiator and an evaporator, and encloses a refrigerant comprising mainly carbon dioxide (CO2), whereinthe internal volume of the high-pressure-side circuit of said refrigerant circuit is less than substantially 70% of the total internal volume of said refrigerant circuit, and a predetermined vessel member is provided in the way of said high-pressure-side circuit, wherein said vessel member is a vessel having a piping cross-sectional area larger than the piping cross-sectional area of said refrigerant circuit, and includes internally a refrigerant reservoir chamber and/or oil separating means. 2. The refrigeration-cycle equipment according to claim 1, wherein said vessel member is a cylindrical vessel; and said vessel member comprises (1) an inlet pipe installed in the vicinity of the upper end of said cylindrical vessel, and in the tangential direction to the inside peripheral surface of said cylindrical vessel; (2) a refrigerant outlet pipe installed through the center portion of the upper end of said cylindrical vessel, and inside said cylindrical vessel downwardly; (3) an oil outlet pipe installed on the lower end of said vessel; and (4) a revolving plate imparting revolution to the refrigerant and the oil installed in said vessel.3. The refrigeration-cycle equipment according to claims 1 or 2 further comprising refrigerant cooling means for cooling said refrigerant by using a part of a high-pressure-side circuit and a part of a low-pressure-side circuit, whereinsaid vessel member is installed between said refrigerant cooling means and said pressure reducer. 4. The refrigeration-cycle equipment according to claim 3, wherein said refrigerant cooling means is an auxiliary heat exchanger for exchanging heat between a radiation-side refrigerant flow path formed between the outlet side of said radiator and the inlet side of said pressure reducer, and an evaporation-side refrigerant flow path formed between the outlet side of said evaporator and the suction side of said compressor.5. Refrigeration-cycle equipment whose refrigerant circuit comprises at least a compressor, a pressure reducer, a radiator and an evaporator, and encloses a refrigerant comprising mainly carbon dioxide (CO2), whereinthe internal volume of the high-pressure-side circuit of said refrigerant circuit is less than 70% of the total internal volume of said refrigerant circuit, and a predetermined vessel member is provided in said high-pressure-side circuit, disposed between said radiator and said compressor. 6. Refrigeration-cycle equipment whose refrigerant circuit comprises at least a compressor, a pressure reducer, a radiator and an evaporator, and encloses a refrigerant comprising mainly carbon dioxide (CO2), whereinthe internal volume of the high-pressure-side circuit of said refrigerant circuit is less than substantially 70% of the total internal volume of said refrigerant circuit, a predetermined vessel member is provided in the way of said high-pressure-side circuit, and refrigerant cooling means for cooling said refrigerant by using a part of a high-pressure-side circuit and a part of a low-pressure-side circuit, wherein a part of said high-pressure-side circuit is also used as said vessel member. 7. The refrigeration-cycle equipment according to any of claims 2, or 6, wherein a ratio of weight of an oil to weight of carbon dioxide (CO2) refrigerant circulating said high-pressure-side circuit is substantially 2% or below when said refrigeration-cycle equipment is in operation.8. The refrigeration-cycle equipment according to any of claims 2, or 6, wherein the carbon dioxide (CO2) refrigerant of a quantity of substantially 0.25 kg or less per liter is filled in said refrigerant circuit.9. The refrigeration-cycle equipment according to any of claims 2, or 6, wherein an oil is filled in the volume less than substantially 50% an internal volume of a shell excluding volume of a compression mechanism portion out of volume of said compressor.10. The refrigeration-cycle equipment according to any of claims 2, or 6, wherein said compressor is a linear compressor of an oil-less type or an oil-poor type.11. The refrigeration-cycle equipment according to any of claims 2, or 6, wherein said radiator has a constitution wherein a plurality of through-holes having a hydraulic-power corresponding diameter of substantially 0.2 mm to 6.0 mm formed in a flat tube are used as the refrigerant paths.12. The refrigeration-cycle equipment according to any of claims 2, or 6, wherein an oil filled in said compressor is an oil insoluble in carbon dioxide (CO2) refrigerant.13. Refrigeration-cycle equipment whose refrigerant circuit comprises at least a compressor, a pressure reducer, a radiator and an evaporator, and an internal volume of a high-pressure-side circuit is less than 70% a total internal volume of said refrigerant circuit, wherein carbon dioxide (CO2) refrigerant of a quantity of substantially 0.25 kg or less per liter is filled in said refrigerant circuit.14. The refrigeration-cycle equipment according to claim 13, wherein a ratio of weight of an oil to weight of the carbon dioxide (CO2) refrigerant circulating said high-pressure-side circuit is substantially 2% or below when said refrigeration-cycle equipment is in operation.15. The refrigeration-cycle equipment according to claims 13 or 14, wherein an oil is filled in the volume less than substantially 50% an internal volume of a shell excluding volume of a compression mechanism portion out of the volume of said compressor.16. The refrigeration-cycle equipment according to any of claims 13 or 14, wherein said compressor is a linear compressor of an oil-less type or an oil-poor type.17. The refrigeration-cycle equipment according to any of claims 13 or 14, wherein said radiator comprises a plurality of through-holes having a hydraulic-power corresponding diameter of substantially 0.2 mm to 6.0 mm formed in a flat tube are used as the refrigerant paths.18. The refrigeration-cycle equipment according to any of claims 13 or 14, wherein oil in said compressor is an oil insoluble in the carbon dioxide (CO2) refrigerant.19. Refrigeration-cycle equipment whose refrigerant circuit comprises at least a compressor, a pressure reducer, a radiator and an evaporator, and encloses a refrigerant comprising mainly carbon dioxide (CO2), whereinthe internal volume of the high-pressure-side circuit of said refrigerant circuit is less than substantially 70% of the total internal volume of said refrigerant circuit, a predetermined vessel member is provided in the way of said high-pressure-side circuit, and refrigerant cooling means for cooling said refrigerant by using a part of a high-pressure-side circuit and a part of a low-pressure-side circuit, wherein said vessel member is installed between said refrigerant cooling means and said pressure reducer. 20. Refrigeration-cycle equipment whose refrigerant circuit comprises at least a compressor, a pressure reducer, a radiator and an evaporator, and encloses a refrigerant comprising mainly carbon dioxide (CO2), whereinthe internal volume of the high-pressure-side circuit of said refrigerant circuit is less than substantially 70% of the total internal volume of said refrigerant circuit, and a predetermined vessel member is provided in the way of said high-pressure-side circuit, wherein a ratio of weight of an oil to weight of carbon dioxide (CO2) refrigerant circulating said high-pressure-side circuit is substantially 2% or below when said refrigeration-cycle equipment is in operation. 21. Refrigeration-cycle equipment whose refrigerant circuit comprises at least a compressor, a pressure reducer, a radiator and an evaporator, and encloses a refrigerant comprising mainly carbon dioxide (CO2), whereinthe internal volume of the high-pressure-side circuit of said refrigerant circuit is less than substantially 70% of the total internal volume of said refrigerant circuit, and a predetermined vessel member is provided in the way of said high-pressure-side circuit, wherein the carbon dioxide (CO2) refrigerant of a quantity of substantially 0.25 kg or less per liter is filled in said refrigerant circuit. 22. Refrigeration-cycle equipment whose refrigerant circuit comprises at least a compressor, a pressure reducer, a radiator and an evaporator, and encloses a refrigerant comprising mainly carbon dioxide (CO2), whereinthe internal volume of the high-pressure-side circuit of said refrigerant circuit is less than substantially 70% of the total internal volume of said refrigerant circuit, and a predetermined vessel member is provided in the way of said high-pressure-side circuit, wherein an oil is filled in the volume less than substantially 50% an internal volume of a shell excluding volume of a compression mechanism portion out of volume of said compressor. 23. Refrigeration-cycle equipment whose refrigerant circuit comprises at feast a compressor, a pressure reducer, a radiator and an evaporator, and encloses a refrigerant comprising mainly carbon dioxide (CO2), whereinthe internal volume of the high-pressure-side circuit of said refrigerant circuit is less than substantially 70% of the total internal volume of said refrigerant circuit, and a predetermined vessel member is provided in the way of said high-pressure-side circuit, wherein said compressor is a linear compressor of an oil-less type or an oil-poor type. 24. Refrigeration-cycle equipment whose refrigerant circuit comprises at least a compressor, a pressure reducer, a radiator and an evaporator, and encloses a refrigerant comprising mainly carbon dioxide (CO2), whereinthe internal volume of the high-pressure-side circuit of said refrigerant circuit is less than substantially 70% of the total internal volume of said refrigerant circuit, and a predetermined vessel member is provided the way of in said high-pressure-side circuit, wherein said radiator has a constitution wherein a plurality of through-holes having a hydraulic-power corresponding diameter of substantially 0.2 mm to 6.0 mm formed in a flat tube are used as the refrigerant paths. 25. Refrigeration-cycle equipment whose refrigerant circuit comprises at least a compressor, a pressure reducer, a radiator and an evaporator, and encloses a refrigerant comprising mainly carbon dioxide (CO2), whereinthe internal volume of the high-pressure-side circuit of said refrigerant circuit is less than substantially 70% of the total internal volume of said refrigerant circuit, and a predetermined vessel member is provided in the way of said high-pressure-side circuit, wherein an oil filled in said compressor is an oil insoluble in carbon dioxide (CO2) refrigerant.
