摘要
通过仿真模拟手段研究非对称极齿型结构磁性液体密封,分析计算了不同轴径、不同密封间隙结构的密封耐压,并针对不同应用场景对磁性液体密封装置两轴端的漏磁场的需求差异,探讨了非对称极齿型结构轴端漏磁场分布的影响因素及规律。结果表明:非对称极齿型结构密封耐压随磁源两侧极齿数量差的增大而减小,最小的密封耐压值也能达到对称极齿型结构密封耐压的70.1%;密封轴径和密封间隙对于非对称极齿型结构与对称极齿型结构密封耐压能力的影响相同;存在一临界值,当密封轴径小于该临界值时密封耐压随轴径增大而减小,当密封轴径超过该临界值时,密封耐压保持不变;非对称极齿型结构的漏磁场主要集中在极齿分布少的一侧的轴端处,另一轴端处漏磁场相比对称极齿型结构的轴端漏磁场要更小,因此可以利用此漏磁特征通过改变磁源两侧极齿数量差对不同轴端漏磁场进行调控。
The pressure resistance of magnetic fluid seals with different structural forms has become an important research topic.We have studied magnetic fluid seals with asymmetric polar teeth structures by means of simulation and calculated the sealing pressure resistance for different shaft diameters and different sealing gap structures.We also discussed the factors influencing the leakage magnetic field distribution at the shaft end of an asymmetric polar teeth structure according to the demand difference of the leakage magnetic field at the two shaft ends of the magnetic fluid seal device in different applications.The results show that the sealing pressure of an asymmetric polar teeth structure decreases as the difference in the number of polar teeth on the two sides of the magnetic source increases,and the minimum sealing pressure value is 70.1%of that of a symmetric polar teeth structure.The influence of seal shaft diameter and seal clearance on the sealing pressure resistance of asymmetric polar teeth structures is the same as that for symmetric polar teeth structures.When the seal shaft diameter is less than a critical value,the seal pressure decreases with increasing shaft diameter.The seal pressure remains unchanged when the seal shaft diameter exceeds this critical value.The leakage magnetic field of asymmetric polar teeth structures is mainly concentrated at the shaft end on the side with fewer polar teeth,whilst the leakage magnetic field at the other shaft end is smaller than that for a symmetric polar teeth structure.This feature of the leakage magnetic field can be used to adjust and control the leakage magnetic field at the different shaft ends by changing the difference in the number of polar teeth on the two sides of the magnetic source.
作者
赵云翔
杨晟
谭晶
李德才
ZHAO YunXiang;YANG Sheng;TAN Jing;LI DeCai(College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029;State Key Laboratory of Tribology,Tsinghua University,Beijing 100084,China)
出处
《北京化工大学学报（自然科学版）》
CAS
CSCD
北大核心
2023年第2期78-88,共11页
Journal of Beijing University of Chemical Technology(Natural Science Edition)
基金
国家自然科学基金(51735006)。
关键词
磁性液体
磁性液体密封
非对称极齿型结构
漏磁
数值分析
magnetic fluid
magnetic fluid seal
asymmetric polar teeth structure
magnetic flux leakage
numerical analysis
