摘要
密封力学特性对于多级离心泵转子运行稳定性,泵机组减振降噪等具有重要意义。为了探究迷宫密封结构对转子运转性能的影响,对不同密封齿高、密封齿距及密封齿厚的密封刚度系数、阻尼系数进行了计算,研究了不同结构的迷宫密封对转子1阶临界转速的影响。结果表明平面密封比迷宫密封具有更好的密封力学性能;直接刚度和直接阻尼随着密封齿高的增加而降低,而交叉刚度与交叉阻尼的变化较小;密封齿高对转子的1阶临界转速的影响较大,临界转速随着密封齿高增大而呈先减小后增大的趋势,当密封齿高大于1 mm后,临界转速变化趋势不明显;而密封齿距及密封齿厚对迷宫密封的密封力学性能及临界转速的影响较小。
Understanding the sealforce behavior is critical in determining the reliability/operability and vibration of centrifuge pumps.In order to study the effect of different labyrinth seal structure on rotordynamic,the Madyn2000 is used to compute the stiffness coefficient,damping coefficient and critic speed for several types of tooth height,tooth pitch,tooth thickness.And the sensitivity of different parameters is investigated.The results show that the sealforce of annular seal is stronger than the labyrinth sea.The influence of tooth height on critical speed is more sufficient than tooth pitch and tooth thickness.As tooth height increases in labyrinth seal,the direct stiffness coefficient(k)and cross stiffness coefficient(kq)decrease,while the direct damping coefficient(m)and direct damping coefficient(mq)change softly.
作者
刘兴发
雪增红
肖飞
李文伟
李奎
LIU Xing-fa;XUE Zeng-hong;XIAO Fei;LI Wen-wei;LI Kui(National Enterprise Technology Center, Chongqing Pump Industry Co. Ltd., Chongqing 400033, China)
出处
《中国农村水利水电》
北大核心
2021年第1期158-161,共4页
China Rural Water and Hydropower
基金
重庆市重点产业共性关键技术创新专项项目(cstc2017zdcy-zdyf0169)。
关键词
离心泵
迷宫密封
刚度系数
阻尼系数
临界转速
centrifugal pump
labyrinth seal
stiffness coefficient
damping coefficient
critical speed
