| 摘要 |
PURPOSE: A cryogenic refrigerating system is provided to operate a refrigerating system continuously and stably by keeping evaporating pressure of refrigerant lower than suction pressure of a freezer, and to improve cooling efficiency and lengthen a life span by flowing refrigerant stably with throttling. CONSTITUTION: A cryogenic multi-stage refrigerating system is composed of a compressor(1) sucking and compressing mixed refrigerant; an oil separator(10) separating oil from compressed refrigerant; a condenser(2) liquefying refrigerant steam from the oil separator; a heat exchanger(3) evaporating refrigerant through a refrigeration cycle at low temperature, and supercooling condensed refrigerant; and a first gas-liquid separator(4-1) separating liquefied refrigerant and steam refrigerant from supercooled mixed refrigerant. Refrigerant from a final evaporator(14) is returned to the compressor. Liquid mixed refrigerant is injected through an expander(8-1) and a nozzle(7-1) to a double pipe(5-1), and streamed to an evaporation refrigerant moving pipe(6). Mixed refrigerant steam from the first gas-liquid separator is condensed with moving up through a condensing pipe, and flowed into a second gas-liquid separator(4-2). Condensed refrigerant is injected and evaporated, and returned to the compressor. Cooling efficiency is improved with flowing refrigerant stably by selecting mixed refrigerant according to stages.
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