ES250-370型双蜗壳双吸泵隔板优化设计  

Optimization Design of Double-volute Splitter in ES250-370 Double-suction Pump

作　　者：刘建瑞[1] 付登鹏 何小可[1] 

机构地区：[1]江苏大学流体机械工程技术研究中心,镇江212013

出　　处：《农业机械学报》2014年第5期96-100,106,共6页Transactions of the Chinese Society for Agricultural Machinery

基　　金：'十二五'国家科技支撑计划资助项目(2011BAF14B02)

摘　　要：针对ES250-370型双蜗壳式双吸离心泵隔板设计不合理导致泵效率不高和径向力过大,使轴发生变形引起密封部件磨损的问题,依据双蜗壳泵设计的基本原理分析了叶轮径向力产生的原因及原双蜗壳泵存在的问题,提出了3种不同隔板位置的改进方案。基于CFX软件提供的RNG k-ε湍流模型及Simple算法对3种不同改进方案的双蜗壳进行定常数值模拟,得到了不同方案蜗壳中截面静压分布云图,并进行了轴应力和径向力分析。模拟和试验结果表明:3号方案双蜗壳泵比原双蜗壳泵额定点效率提高了7%,同时能够有效平衡叶轮的径向力,轴所受到的应力也最小,因此确定3号方案双蜗壳式双吸泵为最优设计,隔板起点为蜗壳的第4断面终点为第8断面,曲线方程为对数螺旋线。Because of unreasonable design of double-volute splitter in ES250-370 double-suction pump, its shaft was bent which lead to wear and tear of the seal. According to the basic principle of double-volute pump design, three different double-volute splitter schemes were put forward; the reason of radical force and the problem of original double-volute were analyzed. Based on the RNG k-εturbulent model provided by CFX software and Simple algorithm, double-volute splitters from three different improved schemes were simulated. Static pressure distribution of different volutes were obtained, the axial stress and radical force of the pump were calculated as well. Steady numerical simulation and experimental results show that, compared to the original splitter, the rated point efficiency of No.3 splitter is increased by 7%, and radical force is balanced effectively and the axis stress is the minimum, while keeping the hydraulic performance. So No.3 is the best design of the three options. Splitter starts from the fourth cross section of double-suction pump and ends with eighth cross section, and it meets the logarithmic curve equipment. A method of designing the splitter for double-volute centrifugal pumps was provided for the pump designer.

关 键 词：双蜗壳式双吸泵 隔板 径向力 优化设计 

分 类 号：TH311[机械工程—机械制造及自动化]