Abstract: A refrigerant cycling device is provided, wherein a compressor comprises an electric motor element, a first and a second rotary compression elements in a sealed container. The first and the second rotary compression elements are driven by the electric motor element. The refrigerant compressed and discharged by the first rotary compression element is compressed by absorbing into the second rotary compression element, and is discharged to the gas cooler.

Abstract: A refrigerant cycling device is provided, wherein a compressor comprises an electric motor element, a first and a second rotary compression elements in a sealed container. The first and the second rotary compression elements are driven by the electric motor element. The refrigerant compressed and discharged by the first rotary compression element is compressed by absorbing into the second rotary compression element, and is discharged to the gas cooler.

Abstract: An object is to improve cooling efficiency while preventing an abnormal increase in pressure of a high side in a cooling apparatus which uses so-called carbon dioxide as a refrigerant. The cooling apparatus comprises a refrigerant circuit in which a compressor, a gas cooler, pressure reducing means, an evaporator and the like are connected in an annular shape, and carbon dioxide is sealed as a refrigerant. In a stable running state in which a temperature of a space to be cooled by the evaporator is cool, time after a start of the compressor until a difference between outlet and inlet temperatures of the evaporator becomes within 1 degree is 5 minutes or more to less than 20 minutes.

Abstract: A refrigerant cycling device is provided, wherein a compressor comprises an electric motor element, a first and a second rotary compression elements in a sealed container. The first and the second rotary compression elements are driven by the electric motor element. The refrigerant compressed and discharged by the first rotary compression element is compressed by absorbing into the second rotary compression element, and is discharged to the gas cooler.

Abstract: A refrigerant cycling device is provided, wherein a compressor comprises an electric motor element, a first and a second rotary compression elements in a sealed container. The first and the second rotary compression elements are driven by the electric motor element. The refrigerant compressed and discharged by the first rotary compression element is compressed by absorbing into the second rotary compression element, and is discharged to the gas cooler.

Abstract: An object of the present invention is to provide a method for manufacturing a multi-stage compression type rotary compressor which can avoid the replacement of parts to be used as much as possible to reduce costs and also which enables easily setting an appropriate displacement volume ratio while preventing the compressor from being increased in size. The gist of the present invention is that an inner diameter of a lower cylinder is altered without altering its thickness (or height), and a displacement volume ratio between first and second rotary compression elements is set to an optimum value in accordance with the alteration.

Abstract: A refrigerant cycling device is provided. The refrigerant cycling device comprises a compressor, an intermediate cooling circuit and a three-way valve device. The compressor is connected to a heat exchanger and a depressurizing means, for performing a cooling operation and a heating operation. The compressor further comprises a first and a second rotary compression elements within a sealed container, and a refrigerant that is compressed and discharged by the first rotary compression element is introduced to the second rotary compression element. The intermediate cooling circuit is used for radiating heat of the refrigerant discharged from the first rotary compression element. The three-way valve device for opening a passage of the intermediate cooling circuit during the cooling operation. In this way, the coefficient of production (COP) during the cooling operation can be improved.

Abstract: An object of the present invention is to provide a method for manufacturing a multi-stage compression type rotary compressor which can avoid the replacement of parts to be used as much as possible to reduce costs and also which enables easily setting an appropriate displacement volume ratio while preventing the compressor from being increased in size. The gist of the present invention is that an inner diameter of a lower cylinder is altered without altering its thickness (or height), and a displacement volume ratio between first and second rotary compression elements is set to an optimum value in accordance with the alteration.

Abstract: A refrigerant system 1D comprises a heat insulating housing 3 provided with an accommodating space inside and a refrigeration unit 9 attached to a lower portion of the heat insulating housing 3, in which a compressor 5, a gas cooler 6, an internal heat exchanger 10, a restriction means 16 and an evaporator 8 accommodated in a heat insulating case 7A are disposed on a unit base 4. The gas cooler 6 and the heat insulating case 7A are disposed so that air heat-exchanged by the gas cooler 6 moves toward the heat insulating case 7A, an air passage T is provided between the unit base 4 and the heat insulating case 7A, the air heat-exchanged by the gas cooler 6 is passed through the air passage T to be discharged outside, and the internal heat exchanger 10 is disposed in such a manner that it is embedded in a heat insulating material layer 7C provided around the heat insulating case 7A to be provided with a heat insulation property.

Abstract: The present invention relates to a trans-critical refrigerating unit comprises a compressor 10, a gas cooler 154, a restriction means 156 and an evaporator 157 sequentially connected to each other, the trans-critical refrigerating unit using a refrigerant, which exhibits supercritical pressure on the high pressure side. In the unit, the compressor 10 includes compressing elements 32, 34 having a plurality of stages in a closed vessel 12, and after a discharge refrigerant in a lower-stage compressing element 32 in these compressing elements is discharged into the closed vessel 12 to dissipate heat, the refrigerant is further compressed by the subsequent-stage compressing element 34 to be discharged and a lubricating oil, which is compatible with said refrigerant and has a kinematic viscosity of 50 to 90 mm2/sec (@ 40° C.), is used.

Abstract: A refrigerant cycling device is provided, wherein a compressor comprises an electric motor element, a first and a second rotary compression elements in a sealed container. The first and the second rotary compression elements are driven by the electric motor element. The refrigerant compressed and discharged by the first rotary compression element is compressed by absorbing into the second rotary compression element, and is discharged to the gas cooler.

Abstract: A refrigerant cycling device is provided, wherein a compressor comprises an electric motor element, a first and a second rotary compression elements in a sealed container. The first and the second rotary compression elements are driven by the electric motor element. The refrigerant compressed and discharged by the first rotary compression element is compressed by absorbing into the second rotary compression element, and is discharged to the gas cooler.

Abstract: A multi-stage compression type rotary compressor, having a driving element and a first and a second rotary compression element that are driven by the driving element in a sealed container, is provided. The refrigerant compressed by the first rotary compression element is discharged into the sealed container, and said discharged refrigerant with an intermediate pressure is then compressed by the second rotary compression element. By cooling the refrigerant absorbed into the second rotary compression element, the rise in the temperature of the refrigerant that is compressed and discharged by the second rotary compression element can be suppressed. And, the supercooling degree of the refrigerant is increases before reaching the expansion valve to improve the cooling ability of the evaporator.

Abstract: For a purpose of preventing a compressor from being damaged by liquid compression without disposing any accumulator on a low-pressure side, there is disclosed a transition critical refrigerant cycle apparatus having a supercritical pressure on a high-pressure side. The transition critical refrigerant cycle apparatus constituted by connecting a compressor, a gas cooler, a pressure reducing device, an evaporator and the like in an annular shape, using carbon dioxide as a refrigerant, and capable of having the supercritical pressure on the high-pressure side comprises: an internal heat exchanger for exchanging heat between a refrigerant which has flown out of the gas cooler and a refrigerant which has flown out of the evaporator.

Abstract: An object is to provide a heating/cooling system capable of achieving reduction of power consumption, and enhancement of performance in a heating/cooling system usable in such a manner as to be switched to be hot/cold. The heating/cooling system having a storage chamber usable in such a manner as to be switched to be hot/cold, comprises: a refrigerant circuit comprising a compressor, a gas cooler, a pressure reducing device, an evaporator and the like, containing carbon dioxide sealed as a refrigerant therein, and having a supercritical pressure on a high-pressure side; a radiator through which the refrigerant flowing out of the gas cooler flows before entering the pressure reducing device; and an air blower which sends air through the gas cooler, the inside of the storage chamber is heated by the radiator, the inside of the storage chamber is cooled by the evaporator, and the air blower is stopped in a case where the inside of the storage chamber is heated by the radiator.

Abstract: A refrigerant cycling device is provided, wherein a compressor comprises an electric motor element, a first and a second rotary compression elements in a sealed container. The first and the second rotary compression elements are driven by the electric motor element. The refrigerant compressed and discharged by the first rotary compression element is compressed by absorbing into the second rotary compression element, and is discharged to the gas cooler.

Abstract: A refrigerant cycling device is provided, wherein a compressor comprises an electric motor element, a first and a second rotary compression elements in a sealed container. The first and the second rotary compression elements are driven by the electric motor element. The refrigerant compressed and discharged by the first rotary compression element is compressed by absorbing into the second rotary compression element, and is discharged to the gas cooler.

Abstract: There is provided a heating/cooling system capable of reducing power consumption. The heating/cooling system has a receiving room capable of using hot air and cold air in a switching manner, and comprises a refrigerant circuit which comprises a compressor, a gas cooler, a radiator, an expansion valve, an evaporator, and the like, in which carbon dioxide is sealed as a refrigerant, and whose high pressure side becomes supercritical pressure. The inside of the receiving room is heated by the radiator and cooled by the evaporator.

Abstract: A refrigerant cycling device is provided, wherein a compressor comprises an electric motor element, a first and a second rotary compression elements in a sealed container. The first and the second rotary compression elements are driven by the electric motor element. The refrigerant compressed and discharged by the first rotary compression element is compressed by absorbing into the second rotary compression element, and is discharged to the gas cooler.

Abstract: A refrigerant cycling device is provided, wherein a compressor comprises an electric motor element, a first and a second rotary compression elements in a sealed container. The first and the second rotary compression elements are driven by the electric motor element. The refrigerant compressed and discharged by the first rotary compression element is compressed by absorbing into the second rotary compression element, and is discharged to the gas cooler.