流体机械

2015, v.43;No.520(10) 16-20+78

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多级离心泵平衡装置的性能研究及结构优化
Study on Performance and Structure Optimization for Thrust Equalizing Mechanism in Multistage Pumps

张炎;李双喜;蔡纪宁;张秋翔;马智萌;
ZHANG Yan;LI Shuang-xi;CAI Ji-ning;ZHANG Qiu-xiang;MA Zhi-meng;Beijing University of Chemical Technology;

摘要(Abstract):

采用Fluent软件,对径向柱面间隙密封-平衡盘(GS-BD)、径向迷宫密封-平衡盘(LS-BD)2种平衡装置的内部流场进行数值计算。对比分析了2种平衡装置内部流场的压力分布规律、平衡装置的平衡性能和泵的容积效率。结果表明:与GS-BD相比较,LS-BD中平衡盘端面间的轴向间隙更小,泄漏率更小,泵的容积效率更高,在有轴向力波动的情况下,叶轮轴系可以更迅速地达到新的平衡状态。此外,进行了LS-BD平衡装置中迷宫密封参数优化分析,研究了迷宫径向间隙、密封腔深度、齿宽、齿数等结构参数对平衡性能的影响规律,得到了各参数的优选值。研究结果为多级离心泵平衡装置的优化设计提供了理论依据。
Because the axial thrust problem has a significant effect on the reliability and efficiency of multistage pumps,it is essential to calculate axial thrust and the performance of thrust equalizing mechanism( TEM) precisely. In this paper,The internal flow characteristics of gap seal-balancing disk( GS-BD) and labyrinth seal-balancing disk( LS-BD) were investigated employing the ANSYS-Fluent software. The pressure distribution and balancing performance as well as pump efficiency were studied. The result shows that,the gap between the impeller and the stationary plate is smaller in the LS-BD,which can reduce the leakage through TEM and increase the efficiency of the pump. Under the condition of axial thrust fluctuation,the impeller system can reach new equilibrium state faster in the LS-BD,which can improve the reliability of the pump. In addition,the structure parameter of labyrinth seal was optimized by studying the influence of radial clearance,cavity depth,tooth thickness,number of cavities on the LS-BD balance performance respectively. These results provide the basis theory guide for the optimization of TEM.

关键词(KeyWords): 平衡装置;迷宫密封;参数优化
thrust equalizing mechanism;labyrinth seal;parameter optimization

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基金项目(Foundation): 国家重点基础研究发展计划973资助项目(2012CB026000)

作者(Author): 张炎;李双喜;蔡纪宁;张秋翔;马智萌;
ZHANG Yan;LI Shuang-xi;CAI Ji-ning;ZHANG Qiu-xiang;MA Zhi-meng;Beijing University of Chemical Technology;

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