关键词: 混合物, 林德循环, 制冷, 节流

Abstract: The single-stage vapor compression refrigeration cycle system with single refrigerant is the most sophisticated technology，but low efficiency at lower temperature zone （?40℃） limits its applications. The mixed throttle refrigerator is able to adapt to different temperature zones，especially deep hypothermia district . This paper introduced the principles and characteristics of azeotropic，near azeotropic and non-azeotropic mixture refrigerants. Previous studies found that azeotropic and near azeotropic mixture refrigerants are similar to the single working fluid. Single-stage compression chiller with multiple working fluids relies on non-azeotropic refrigerant’s characteristics to achieve deep cooling. The studies of a mixed refrigerants Linde cycle system’s（LHR）the development history and current situation were introduced. This paper also introduced the characteristics and selection principles of the lubricant in cryogenic systems which combining the mixed refrigerant Linde cycle system experiment. Improvement measures such as increasing air-cooled pre-cooler，regenerator foamed and optimized aspects of the system were proposed

Key words: mixtures, Linde cycle, refrigeration, throttling