摘要
合肥先进光源(HALF)计划建成为低能区衍射极限储存环光源,采用多弯铁消色散磁聚焦结构(MBA lattice)。相比于三代光源,MBA lattice使得超高真空系统布局更紧凑,磁铁间常用ConFlat法兰安装困难。链式卡箍法兰轴向尺寸仅为链条宽度,远低于ConFlat法兰,且安装位置在直径方向,所需安装空间小,很好的满足了储存环真空系统对法兰部件提出的要求。但其技术被国外厂商垄断,且国内外相关研究文献较少。为了解决这些难题,设计并加工了一套小通径链式卡箍法兰组件,实验测量了法兰实现超高真空密封漏率的最小力矩,反复安装并更换垫圈8次以评估法兰寿命,研究了法兰组件在高温循环烘烤和低温液氮环境下的工作情况。测试结果表明所设计的法兰组件满足超高真空法兰的密封性能要求,对温度变化有较好的耐受性。通过受力分析和有限元方法,计算了法兰密封力和垫圈应力分布。
Hefei advanced light facility(HALF) using multi-bend achromat(MBA) lattice is planned to be built as a diffraction-limited storage ring(DLSR) in low energy region. Compared with the third-generation light source, the MBA lattice has a more compact layout, so the distance between focusing magnets decreases greatly.Such compactness dissatisfies the installation of the commonly used ConFlat(CF) flange. The ultra-high vacuum(UHV) chain clamp flange only needs a ring of soft chain clamp to fasten two flanges, whose axial dimension, much lower than that of CF flange, is determined by the width of the chain clamp. In addition, the flange mounting is along the radial direction, which requires less installation space. Therefore, the chain clamp flange can meet the demands of the HALF vacuum system. Although the chain clamp flange has been applied in some large facilities around the world, its key techniques are monopolized by foreign vendors, and domestic-related studies are scarce. In order to solve these difficulties, a set of chain clamp flanges with the knife-edge sealing structure were designed. The minimal sealing torque was tested, and the flange was repeatedly mounted and unmounted eight times to evaluate working life. The experiments of bakeout cycles and putting flanges into liquid nitrogen were also carried out. The results indicate that the leak rate of the designed flange can reach the standard of the UHV flange, and the flange has good tolerance for temperature changing. The sealing force and stress distribution of the OFC gaskets have been calculated by force analysis and the finite element method. In future work, the chain clamp flange will be expanded to all sorts of diameters, forming a standardized vacuum component.
作者
卞抱元
洪远志
王思慧
范乐
朱邦乐
张文丽
王勇
BIAN Baoyuan;HONG Yuanzhi;WANG Sihui;FAN Le;ZHU Bangle;ZHANG Wenli;WANG Yong(National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230029,China)
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2022年第9期663-669,共7页
Chinese Journal of Vacuum Science and Technology
基金
国家自然科学基金项目(11975226,12175225)。
