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摘要 ：针对自然博物馆标本杀菌的特殊要求，设计并搭建了一座超低温冷库，为满足标本杀菌时对最低稳定温度、降温速率、长时保温以及可控复温的严格要求，冷源由一套简单复叠式低温制冷系统和两套高温机可切换成一机两用的复叠式制冷系统组成。经过长期运行发现，在允许的波动范围内，该冷库系统完全满足标本杀菌的温度控制要求，运行稳定、可靠。 关键词： 超低温冷库 复叠制冷 标本杀菌 Development Of An Ultra-Low Temperature Switchable Cascade Refrigeration Storage For Specimen Disinfection C. Y. Yu1 Z. Tang2 X. J. Zhang1 S. Li1 1.Institution of refrigeration and cryogenics, Zhejiang University, Hangzhou 310027, China; 2. Guangzhou Coltherml Environmental Engineering Technique CO. LTD, Guangzhou 510640, China Abstract: For the special demand of specimen disinfection in natural museum, an ultra-low temperature refrigeration storage has been designed and built, which can meet the specimen disinfections demand for the stable minimum temperature, the speed of temperature reduction, the insulation for long-time and the rewarming need to be controlled. The cold source of the refrigeration storage contains a set of simple cascade refrigeration system and two sets of switchable cascade refrigeration system, of which the high temperature cooler is a dual-purpose machine. After a long time operation, it is found that this refrigeration storage system can satisfy the temperature control demand for the specimen disinfection in the fluctuation range allowed, and also is of good stabilization and credibility. Keywords: ultra-low temperature refrigeration storage cascade refrigeration specimen disinfection