摘要
本文设计并加工了一台大冷量单级G-M制冷机,通过实验测试,分析了制冷机制冷性能的影响因素,通过优化冷端换热器和阀门结构,提高了制冷性能以及可靠性。结果表明:该制冷机在70 K温区的制冷量达到254 W/50 Hz、276 W/60 Hz,功耗为6.9 kW/50 Hz、7.2 kW/60 Hz;改变系统充气压力能够使制冷性能提高3.4%;制冷机运行方向从0°到180°的变化过程,制冷性能逐渐衰减;在长达近6000 h的稳定性测试中,制冷机无负载最低制冷温度变化范围不超过3 K,70 K温区的制冷性能稳定,无明显衰减。
In this paper,large cooling capacity single stage Gifford-McMahon(GM)cryocoolers are developed,and the factors affecting the cooling performance are analyzed by experimental research.The refrigeration performance and reliability have been improved by optimizing the structure of cold end heat exchangers and valves.The results showed that the refrigeration capacity of the refrigerator reached 254 W/50 Hz and 276 W/60 Hz in the 70 K temperature range,with power consumption of 6.9 kW/50 Hz and 7.2 kW/60 Hz,respectively.The cooling performance increased about 3.4%by changing system filling pressure and the cooling capacity attenuated as the inclination from 0°to 180°.In 6000 hours of stability tests,the minimum refrigeration temperature fluctuation is less than 3 K,and cooling performance is stable at 70 K without significant attenuation.
作者
何韩军
周志坡
朱良友
李奥
董文庆
许治勇
HE Hanjun;ZHOU Zhipo;ZHU Liangyou;LI Ao;DONG Wenqing;XU Zhiyong(CSIC PRIDe(Nanjing)Cryogenic Technology Co.,Ltd.,Nanjing 211106,Jiangsu,China)
出处
《制冷技术》
2024年第4期24-27,33,共5页
Chinese Journal of Refrigeration Technology
关键词
G-M制冷机
大冷量
单级
设计
实验
G-M cryocooler
Large cooling capacity
Single stage
Design
Experiment
