| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a refrigeration device in which an injection amount of a desired flow rate is secured and moreover, a target swirl flow is formed. <P>SOLUTION: Refrigerants flowing in first to third injection pipes 63, 73 and 83 of first to third economizers 60, 70 and 80 are respectively branched to first to third upstream side flow passages 64, 74 and 84 and first to third downstream side flow passages 65, 75 and 85. The first to third downstream side flow passages 65, 75 and 85 merge with intermediate connection pipes 18, 28 and 38 right before suction by a second compression mechanism 20, right before suction by a third compression mechanism 30, and right before suction by a fourth compression mechanism 40 respectively to generate swirl flows in the sucked refrigerants. Mass flow rates of the refrigerant flowing in the first to third upstream side flow passages 64, 74 and 84 and mass flow rates of the refrigerant flowing in the first to third downstream side flow passages 65, 75 and 85 are controlled by first to third flow rate control valves 66, 76 and 86. <P>COPYRIGHT: (C)2013,JPO&INPIT |
