激光传输通道动密封防尘结构设计  

Design of dynamic sealed and dustproof structure of laser transmission channel

作　　者：李冰[1,2] 韩光宇 吴运寒[1] LI Bing;HAN Guang-yu;WU Yun-han(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [2]中国科学院大学,北京100049

出　　处：《激光与红外》2021年第9期1137-1142,共6页Laser & Infrared

摘　　要：激光传输通道工作环境复杂,为满足系统密封要求,设计了一种磁流体动密封结构。主要由磁流体、极靴、永磁体、内筒、外筒和盖板组成。建立磁场仿真模型,计算了不同密封间隙内磁场的大小及其分布。分析了0.1~0.4mm间隙下的理论耐压能力,根据工程要求选取了密封间隙0.2mm。耐压值可以达到0.26 MPa。应用Block Lanczos法对内筒进行模态分析,一阶固有频率690.94 Hz,远高于经纬仪固有频率,满足动力学要求。最后进行试验并分析了离心力对密封的影响。结果表明密封结构的各项指标均满足可以要求。The working environment of the laser transmission channel is complicated.In order to meet the requirements of system sealing,this paper designs a magnetic fluid dynamic sealing structure.It is mainly composed of magnetic fluid,pole shoe,permanent magnet,inner tube,outer tube and cover plate.The magnetic field simulation model was established,and the size and distribution of the magnetic field in different sealing gaps are calculated.The theoretical pressure resistance capacity under the gap of 0.1~0.4mm was analyzed,and the sealing gap of 0.2mm was selected according to engineering requirements.The theoretical calculation showed that the withstand pressure can reach 0.26 MPa.The Block Lanczos method was applied to the modal analysis of the inner cylinder.The first order natural frequency is 690.94 Hz,which is much higher than the natural frequency of the theodolite and meets the dynamics requirements.Finally,experiments were carried out and the influence of centrifugal force on the seal is analyzed.The results show that all the indicators of the sealing structure meet the requirements.

关 键 词：动密封 磁流体 激光传输通道 磁场分析 

分 类 号：TN243[电子电信—物理电子学] TH703[机械工程—仪器科学与技术]