低温显微镜新冷源系统的实验研究  

Experimental Study on a New Low-temperature System for Cryomicroscope

作　　者：李巧巧[1] 陈儿同[1] 左志强[1] 杨晓芸[1] 张华[1] 徐文强[1] 

机构地区：[1]上海理工大学能源与动力学院,上海200093

出　　处：《制冷学报》2011年第3期53-55,59,共4页Journal of Refrigeration

基　　金：上海市重点学科建设(S30503)项目资助~~

摘　　要：提出一种以氮气为冷源通过微型节流制冷器制冷以满足低温显微镜降温要求的新方案。给出了低温显微镜新冷源系统的原理图。为确定节流管参数(节流管内径及长度)和节流最佳压力进行了相关实验。为确定系统的可行性,进行了系统的温降和冷量以及氮气耗量的测试实验。实验结果表明:节流孔选用内径为0.3mm,长度为10mm的不锈钢管。氮气节流前的最适宜压力为7MPa。该冷源系统的温降和冷量以及氮气消耗均能满足要求。A new scheme,which takes nitrogen as a cold source and utilizes a micro-throttle refrigerator to cool the nitrogen,is presented for satisfying the temperature-drop demands of cryomicroscope.An elementary diagram of cryo-microscope＇s novel cold source system is given.To determine the parameters of throttle tubes（internal diameter and length）,the optimum throttling pressure,temperature drop,the refrigerating capacity and nitrogen consumption,three experiments was conducted.The results show that the internal diameter and length of the throttle tubes made by stainless steel should be 0.3mm and 10mm respectively.Meanwhile,the optimum pressure before throttling is 7Mpa.The temperature drop,the refrigerating capacity and the nitrogen consumption of this system all satisfy the requirement of the system.

关 键 词：热工学 低温显微镜 节流制冷器 冷源系统 

分 类 号：TH742[机械工程—光学工程] TH773[机械工程—仪器科学与技术]