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稳态磁镜装置超导磁体系统低温恒温器中液氦贮槽的上法兰,其密封圈直径为520毫米,要求工作在10—16k 的低温下和6.67×10~(-6)帕以上的超高真空环境中,为满足液氦的低温要求及烘烤的高温要求,选用金丝密封圈在法兰设计及密封圈安装等方面采取了一些措施:法兰与法兰圈获用加厚设计,台阶式密封结构;试验了两种密封圈安装工艺:法兰密封性能的液试验表明,第二种安装工艺在常温下漏率小于1.69×10~(-7)帕·升/秒:介绍了与整机一起进行的液氦试验:第二种安装工艺在充液氦后真空度达到6.67×10~(-7)帕,系统真空室剩余气体的氦分压小于1.33×10~(-9)帕,满足物理实验要求。
Steady magnetic mirror system Superconducting magnet system Cryogenic thermostat in the liquid helium tank on the flange, the ring diameter of 520 mm, the requirements of the work in the 10-16k low temperature and 6.67 × 10 ~ (-6) Pa or more Of the ultra-high vacuum environment, in order to meet the low temperature liquid helium requirements and high temperature baking requirements, the choice of gold ring in the flange design and installation of seals and other measures taken to take: Flanges and flanges were used plus Thick design and step seal structure. Two kinds of sealing ring installation process were tested: the liquid sealing test of the flange showed that the leakage rate of the second installation process was less than 1.69 × 10 -7 Pa · L / s The liquid helium test carried out with the whole machine is introduced. The second installation process achieves a vacuum degree of 6.67 × 10 ~ (-7) Pa after filled with helium. The partial pressure of helium in the system vacuum chamber is less than 1.33 × 10 ~ (-9) Pa, to meet the requirements of the physical experiment.