| 摘要 |
PROBLEM TO BE SOLVED: To provide a supercritical refrigeration cycle that can appropriately suppress an abnormal rise in compressor discharge refrigerant temperature and an abnormal rise in high pressure side pressure without using a variable displacement compressor. SOLUTION: A compressor and a pressure reducing means of the supercritical refrigeration cycle comprise a fixed displacement compressor 1 and an electric expansion valve 4 with electrically controllable travel, respectively. A bypass passage 9 is defined to interconnect a high pressure side refrigerant passage and a low pressure side refrigerant passage, and a mechanical pressure-sensitive valve 9a configured to open when the pressure of the high pressure side refrigerant passage rises to a predetermined pressure set in advance is disposed in the bypass passage 9. When a discharge refrigerant temperature of the compressor 1 rises to a predetermined high temperature, a control device 10 controls the electric expansion valve 4 to increase the travel. COPYRIGHT: (C)2007,JPO&INPIT
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