2500 W@4.5 K&500 W@2 K氦制冷机可靠性可用性分析  

Reliability and availability analysis of a 2500 W@4.5 K&500 W@2 K helium refrigerator

作　　者：李静[1] 刘立强[1,2] 熊联友 周刚[1] 董斌 Li Jing;Liu Liqiang;Xiong Lianyou;Zhou Gang;Dong Bin(State Key Laboratory of Technologies in Space Cryogenic Propellants (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences), Beijing 100190, China;University of Chinese Academy of Sciences, Beijing 100049, China)

机构地区：[1]航天低温推进剂技术国家重点实验室(中国科学院理化技术研究所),北京100190 [2]中国科学院大学,北京100049

出　　处：《低温工程》2020年第5期12-18,共7页Cryogenics

基　　金：航天低温推进剂技术国家重点实验室基金课题资助。

摘　　要：中国科学院理化技术研究所研制了一台2500 W@4.5 K&500 W@2 K氦制冷机,从建立模型和收集数据两个方面入手,评估了该制冷机的可靠性和可用性。可靠性框图方法结合了故障模式、效应及危害度分析方法FMECA,采用低温部件失效的新输入数据,对制冷机进行了可靠性分析,计算了制冷机各部件的静态可靠度重要性。对压缩机、PLC控制系统的维修时间也进行了拟合,对制冷机进行了可用性分析。结果表明,影响2500 W@4.5 K&500 W@2 K氦制冷机长期可靠性的关键设备是压缩机,透平,冷压缩机等动设备,液氮预冷系统,PLC控制系统和真空系统等辅助系统,并提出了提高氦制冷机可靠性可用性的改进措施。A 2500 W@4.5 K&500 W@2 K helium refrigerator has been established in the Technical Institute of Physics and Chemistry,CAS.A reliability block diagram method as well as a Failure Modes,Effects and Criticality Analysis(FMECA)method have been performed to evaluate this refrigerator’s reliability.New failure data have been collected.Recover time distributions of compressor and PLC control system have been fitted to calculate this refrigerator’s availability.The results show the key components which affect the refrigerator’s reliability most are rotating equipments(compressor,turbine and cold compressor),liquid Nitrogen system and auxiliary system(PLC control system and vacuum pump).The mitigation actions to improve this refrigerator’s reliability and availability have been proposed.

关 键 词：氦制冷机 可靠性分析 可用性分析 失效数据分布 维修时间分布 

分 类 号：TB651[一般工业技术—制冷工程]