后密封环直径对离心泵轴向力特性的影响  

Influence of diameter of rear sealing ring on axial force characteristics of centrifugal pump

作　　者：刘在伦[1,2] 徐航 芦维强 陈淘利 LIU Zailun;XU Hang;LU Weiqiang;CHEN Taoli(College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou,Gansu 730050,China;Engineering Institute of Wenzhou Pump&Value,Lanzhou University of Technology,Wenzhou,Zhejiang 325105,China)

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050 [2]兰州理工大学温州泵阀工程研究院,浙江温州325105

出　　处：《排灌机械工程学报》2020年第2期115-120,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51269010);浙江省自然科学基金资助项目(LY12E09002)

摘　　要：为了研究叶轮后密封环直径大小的变化对离心泵平衡腔液体压力和轴向力的影响,对泵进行了全流道三维建模和仿真模拟;经对比发现,离心泵性能的数值模拟与试验测试结果基本吻合.在此基础上,对泵后密封环直径90~140 mm范围内泵扬程、效率和轴功率进行预测,研究泵设计工况下,后密封环直径对平衡腔内液体压力沿轴向和径向的分布规律,及其对轴向力的影响,并绘制出扬程系数与轴向力系数的量纲一关系曲线.结果表明:同一流量工况下,增大后密封环直径时,泵扬程降低,效率降低,轴功率提高,且后密封环直径越大,其对泵性能的影响越显著;同一后密封环直径下,平衡腔内液体压力沿轴向基本保持不变,压力由泵轴至密封环出口处沿径向增大;轴向力系数曲线是非线性曲线,当比面积K减小时,轴向力系数逐渐增大,当K=0.25时,轴向力几乎为零,此时泵的轴向力平衡能力最优.In order to study the effect of diameter of the rear sealing ring on the liquid pressure and axial force in the balance cavity of centrifugal pump,3D modeling and simulation of the whole flow for the pump were carried out to find out basic agreement between the numerical simulation of centrifugal pump performance and the experimental measurements.On this basis,the pump head,efficiency and shaft power in the range of 90-140 mm in diameter of the rear sealing ring were predicted.Under the pump design conditions,the distribution of the diameter of the rear sealing ring in the axial and radial directions of the liquid pressure in the balance cavity,and its effect on the axial force were studied.And then,the dimensionless relationship curves of head coefficient and axial force coefficient were plotted.The results show that under the same flow conditions,when the diameter of the rear sealing ring increases,the pump head and the efficiency decrease but the shaft power increases;moreover,the larger the diameter of the rear sealing ring,the more significant effect on pump performance.Under the same diameter of the rear sealing ring,the liquid pressure in the balance cavity almost keeps unchanged in the axial direction,and the pressure increases radially from the pump shaft to the outlet of the sealing ring.The axial force coefficient curve is a non-linear curve,and when the specific area K decreases,the axial force coefficient gradually increases.When K is 0.25,the axial force is almost zero and the pump′s ability to balance the axial force is the best.

关 键 词：离心泵 后密封环 平衡腔压力 轴向力 数值模拟 

分 类 号：TH311[机械工程—机械制造及自动化] S277.9[农业科学—农业水土工程]