氦气冷压机应用超导磁悬浮轴承技术分析

Technical analysis of application of superconducting magnetic bearing in helium cold compressor

大型超流氦制冷系统在大科学工程上起着重要的作用,氦气冷压机轴承技术仍是面临的关键技术问题。高温超导磁悬浮轴承具备无接触承载且自控稳定的优势,但尚无将超导磁悬浮轴承应用在氦气冷压机特定工况的研究报道。以成功应用的主动式磁悬浮轴承离心式冷压机结构和运行参数为参考,计算了在相近尺寸下超导磁悬浮轴承单位面积下的最大悬浮性能,进行了典型径向型超导磁悬浮轴承研究现状分析,从理论计算和工程应用两个角度论证了超导磁悬浮轴承具备了应用于冷压机系统的可行性,并对超导磁悬浮轴承应用于冷压机面临的关键技术进行了简要分析。

Large - scale superfluid helium refrigeration system plays an important role in large - scale scientific projects. The bearing technology of helium cold compressor is still the key technical issue. High - temperature superconducting （HTS） magnetic bearings with the way of non - contact bearing and advantages of self - control and stability, but there is no report about superconducting magnetic bearings used in special helium cold compressor. Based on the structure and operating parameters of active maglev bearings which have been successfully applied in centrifugal cold compressor, the maximum levitation force per unit area of the superconducting magnetic bearings was calculated and the current research situation of typical radial superconducting magnetic bearings was analyzed. From two aspects of theoretical calculation and engineering application, it is demonstrated that the superconducting magnetic bearing has the feasibility of being applied to the cold compressor system. The key technologies that the superconducting magnetic bearing is applied to cold compressor are briefly analyzed.