| 摘要 |
PROBLEM TO BE SOLVED: To prevent the deterioration of lubricant or the damage of a compressor due to intensive heating by providing an expansion valve between a gas cooler and the suction side of an inner heat exchanger, lowering the gas pressure closely to a critical level and then exchanging heat internally so that the gas can be cooled down to a condensation point thereby preventing overheat of compressed gas. SOLUTION: The pressure of refrigerant subjected to heat radiation in a gas cooler 102 by means of a fan motor 1071 is lowered, at point C, from P2 to P3 at point C2 by means of a first expansion valve 1041 and then the temperature at point C3 is lowered by means of an inner heat exchanger 106. Subsequently, the pressure is lowered, at point C3, from P3 to P7 by means of a second expansion valve 1042 and the refrigerant is introduced to the point of inlet D of an evaporator 105. Consequently, the refrigerant sucked into a compressor 101 is compressed and delivered. Since temperature of the compressor 101 is kept at a low level, excess refrigerant can be stored in a liquid receiver 103. Since the refrigerant passed through the evaporator 105 is passed through the inner heat exchanger 106, radiated heat is absorbed and sucked into the compressor.
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