BTTZ电缆制造过程中氧化镁落粉均匀性研究  

Study on the Uniformity of Magnesium Oxide Powder Falling During the Manufacturing Process of BTTZ Cable

作　　者：章城 李伟钢 徐季新 文东辉 ZHANG Cheng;LI Weigang;XU Jixin;WEN Donghui(Zhejiang Yuantong Wire&Cable Manufacturing Co.,Ltd.,Hangzhou 311108,China;Wenzhou University,Zhejiang key Laboratory of Laser Processing Robot,Wenzhou 325035,China;Key Laboratory of E&M,Ministry of Education&Zhejiang Province,Zhejiang University of Technology,Hangzhou 310014,China)

机构地区：[1]浙江元通线缆制造有限公司,杭州311108 [2]温州大学浙江省激光加工机器人重点实验室,温州325035 [3]浙江工业大学特种装备制造与先进技术教育部重点实验室,杭州310014

出　　处：《电线电缆》2023年第1期49-54,共6页Wire & Cable

基　　金：浙江省博士后择优资助项目(ZJ2020042)。

摘　　要：新型垂直氧化镁灌装法是矿物绝缘电缆(BTTZ电缆)的主流生产线,但是由于氧化镁落粉不密实的原因,其击穿电压较难达到2 500 V的标准。针对以上不足,对氧化镁落粉特性和影响因素进行有限元分析研究,采用Ansys DesignModeler软件对落粉流体域模型进行了建模,并利用Ansys Mesh软件对仿真模型进行网格划分,之后采用Ansys Fluent软件对模型进行材料属性及边界条件等设置,并展开仿真计算和后处理分析。得到分析结果为:通常情况下,管道边缘部分和中心点部分的粉末体积占比较大,而空心圆(铜导体放置的位置)之间的粉末体积占比相对较小。此外,漏斗的角度对落粉均匀性影响不大,而氧化镁的粒径对落粉均匀性有一定的影响,在一定范围内,粉末粒径越小落粉越均匀,故为了提高落粉均匀性可适当减小氧化镁粉粒径。The new vertical magnesia filling BTTZ production line is the current mainstream production line for this product, but due to the lack of compactness of the magnesia powder, it is difficult for its breakdown voltage to reach the 2 500 V standard. In view of the above shortcomings, the characteristics and influencing factors of magnesium oxide powder fall were studied by Finite Element Analysis, the falling powder fluid domain model was modeled by Ansys DesignModeler software, the simulation model were meshed by Ansys Mesh software. The material properties and boundary conditions of the model were set by Ansys Fluent software, and perform simulation calculation and post-processing analysis were carried out. Finally, the analysis results were obtained: under normal circumstances, the powder concentration in the edge part and the center point of the pipe was relatively large, while the powder concentration between the hollow circles(where the copper conductor was placed) was relatively small. In addition, the angle of the funnel had little effect on the uniformity of powder falling, while the particle size of magnesium oxide had a certain effect on the uniformity of powder falling. Within a certain range, the smaller the particle size, the more uniform the powder falling. Therefore, in order to improve the uniformity of falling powder, the particle size of the magnesium oxide powder could be appropriately reduced.

关 键 词：防火电缆 氧化镁 有限元分析 灌粉特性 

分 类 号：TH69[机械工程—机械制造及自动化]