基于磁流变液的光束定向器密封机理与实验研究  

Mechanism and experimental study of beam director sealing based on magnetorheological fluid

作　　者：申玉瑞 王其雨 彭来 华德正 刘新华[1] Shen Yurui;Wang Qiyu;Peng Lai;Hua Dezheng;Liu Xinhua(School of Mechanical and Electrical Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学机电工程学院,徐州221116

出　　处：《仪器仪表学报》2024年第12期137-148,共12页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(52405081,51975568);江苏省自然科学基金(BK20231066);中国矿业大学研究生创新计划(2023WLKXJ085);中央高校基本科研业务费专项(2023XSCX025);江苏省研究生科研与实践创新计划(KYCX23_2670)项目资助。

摘　　要：光束定向器是光学系统的核心组件,其内部光路传输通道的气体密封性对系统整体性能具有决定性作用。为解决传统填料密封易磨损、驰豫性显著的问题,设计了一种基于磁流变液的光束定向器密封结构,并研究了磁流变密封技术的工作原理及其理论模型。首先,针对光束定向器大直径密封的特定需求,设计永磁体阵列式、抗离心型的磁流变密封结构。其次,开展微观磁流变液流变特性观测实验,分析微观尺度下磁流变密封机理;同时,开展基于流变仪的宏观流变特性测试,拟合基于磁-温复合场的磁流变液屈服模型,并进一步建立了修正磁流变密封耐压方程与摩擦力矩模型。最后,搭建光束定向器光路磁流变密封的等效实验平台,开展不同温度条件、淋雨及盐雾模拟工况下的耐压测试实验和摩擦力矩测试实验。实验结果表明,磁流变密封结构能够充分满足光束定向器光路密封的要求,所构建的修正模型能有效反映温度对磁流变密封性能的影响,为光束定向器轴系光路密封技术的革新提供了重要的理论依据与实践指导。The beam director is the core component of the optical system,and the gas sealing of the internal optical transmission channel plays a decisive role in the overall performance of the system.To address the issues of easy wear and significant relaxation in traditional packing seals,this paper designs a beam director sealing structure based on magnetorheological fluid and studies the working principle and theoretical model of magnetorheological fluid sealing(MRFS)technology.Firstly,a MRFS structure with permanent magnet array and anti-centrifugal type is designed to meet the specific requirements of large diameter seal of beam directors.Secondly,the observation experiment of the rheological properties of the micro-magnetorheological fluid is carried out to analyze the mechanism of MRFS at the micro-scale.At the same time,the macroscopic rheological properties are tested based on rheometer,the yield model of magnetorheological fluid based on magnetorheological complex field is fitted,and the modified MRFS pressure resistance formula and friction moment model are further established.Finally,the equivalent experimental platform of the MRFS of the optical path of the beam director is built,and the pressure resistance test and friction torque test were carried out under different temperature conditions,rain and salt spray simulation conditions.The experimental results show that the MRFS can fully meet the requirements of the optical path seal of the beam director,and the modified model can effectively reflect the influence of temperature on the performance of MRFS.It provides an important theoretical basis and practical guidance for the innovation of the optical path seal technology of the beam director shafting.

关 键 词：光束定向器 磁流变密封 微观密封机理 密封理论模型修正 

分 类 号：TH69[机械工程—机械制造及自动化]