冷箱是G-M/J-T氦制冷机系统的核心装置,氦制冷机冷箱由真空杜瓦、热防护屏组件、低温阀门和换热器组等构成,工作温度远低于环境温度。冷箱的漏热是影响G-M/J-T氦制冷机性能的一个重要因素。通过对G-M/J-T氦制冷机冷箱各主要部件的漏热计算,得出了冷箱内部主要部件漏热量分布,并进行了冷箱漏热实验验证,为G-M/J-T氦制冷机系统的优化设计和实验运行提供指导。 The cold box is the core unit of the G-M / J-T helium refrigerator system. The cold box is composed of vacuum dewar, thermal shield assembly, cryogenic valve and heat exchanger. The working temperature is much lower than the ambient temperature. Leakage in the cold box is an important factor affecting the performance of the G-M / J-T helium refrigerator. By calculating the heat loss of the main components of the cold box of the GM / JT helium refrigerator, the heat leakage distribution of the main components inside the cold box is obtained, and the cold box leakage experiment is verified to optimize the GM / JT helium refrigerator system Design and experimental operation to provide guidance.