摘要
液压作动器内部密封件的蓄能性能是衡量其可靠性的关键,而U形弹簧作为蓄能密封圈的弹性元件,其压缩刚度和弹性压缩极限是决定其蓄能性能的主要因素。建立基于材料参数的U形弹簧弹塑性有限元模型,计算U形弹簧的压缩刚度、弹性压缩极限和线性压缩临界值,分析典型结构参数对蓄能特性的影响;基于响应面法构建多因素数学模型,比较各结构参数对弹簧压缩刚度和弹性压缩极限的影响程度;通过多次弹簧压缩试验验证了计算模型的准确性。结果表明:弹簧厚度、截面总长、开槽宽度、周期宽度和根部圆弧半径为压缩刚度的主要影响因素,其影响依次减小;弹簧厚度、截面总长和根部弧半径为弹性压缩极限的主要影响因素,其影响依次减小。重复压缩试验证明,弹簧屈服产生的塑性变形会随着压缩次数累加,导致弹簧开口宽度减小,导致密封圈动态密封性能降低;当蓄能密封圈用于动密封时其压缩量不宜超过弹性压缩极限。
Compression performance of spring energized seal is the key to evaluating the reliability of electro-hydraulic actuator.While as the elastic component of the spring energized seal,the compression stiffness and maximum elastic compression of U-spring are the main factors determining the energized performance.An elastic-plastic finite element model of U-spring was established based on the standard measured material parameters.The compression stiffness,maximum elastic compression and maximum linear compression of U-spring were obtained.The influence of typical structural parameters of U-spring on compression performance was analyzed,and a multi-factor mathematical model was constructed based on the response surface method.The accuracy of the calculation model was verified through multiple spring compression tests.The results show that spring thickness,total section length,slotting width,period width and bending radius are the main influencing factors of compression stiffness,and their effects decrease sequentially.Spring thickness,total section length,and root arc radius are the main influencing factors of maximum elastic compression,and their effects decrease sequentially.The repeated compression test shows that the plastic deformation caused by spring yield will accumulate with the number of compression cycles,leading to a decrease in the width of the spring opening and a decrease in the dynamic sealing performance of the sealing ring.When the energy storage sealing ring is used for dynamic sealing,its compression should not exceed the maximum elastic compression.
作者
刘登宇
赵军
李双喜
闫欣欣
程天馥
LIU Dengyu;ZHAO Jun;LI Shuangxi;YAN Xinxin;CHENG Tianfu(College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2024年第4期138-146,共9页
Lubrication Engineering
关键词
蓄能密封圈
结构参数
蓄能特性
弹塑性模型
响应面法
spring energized seal
structure parameter
energized performance
elastoplastic model
response surface method
