油气混合氦透平膨胀机在EAST低温系统中应用现状研究  

Research on Application Status of Helium Turbo-expander with Oil-gas Hybrid Bearing in EAST Cryogenic System

作　　者：王学敏[1] 朱平[1] 付豹[1] 

机构地区：[1]中国科学院等离子体物理研究所,安徽合肥230031

出　　处：《润滑与密封》2010年第7期95-98,共4页Lubrication Engineering

基　　金：国家"九五"大科学工程EAST项目(计投资(1998)1303号);中国科学院重要方向性项目

摘　　要：介绍用于EAST(Experimental Advanced SuperconductingTokamak)低温系统中特殊结构的氦透平膨胀机,并且指出在当前降温过程中氦透平膨胀机不稳定性问题。分析2种降温模式(使用透平D和不使用透平D)对制冷机性能的影响,结果表明不使用透平D将会大大降低制冷机的性能。在现有条件下提出对静压气体轴承的改进设计,试验结果表明此方法能有效改善氦透平膨胀机的稳定性。The turbine-expander with specific configuration in EAST （Experimental Advanced Superconducting Tokamak） cryogenic system was introduced, and the instability of the turbo-expanders in actual refrigerating process was pointed out. Two different refrigerating methods （ using turbine D or no-using turbine D） were analyzed. The results show that no-using turbine D will degrade the performance of the refrigerator largely. An improved design of the externally pressurized gas bearing for helium turbo-expander was put forward in current condition. The experimental results indicate that the new design could improve the stability of helium turbo-expander effectively.

关 键 词：EAST 低温氦透平膨胀机 静压气体轴承 稳定性 

分 类 号：TH133.3[机械工程—机械制造及自动化]