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| Calculation method and experimental verification for axial thrust on centrifugal pump |
| LIU Zailun1,2, ZENG Jilai1, SHAO Ancan3, WU Xinrui3 |
| 1.College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Engineering Institute of Wenzhou Pump & Valve, Lanzhou University of Technology, Wenzhou, Zhejiang 325105, China; 3.PRE(Fujian)Pump Industry Co. Ltd, Songxi, Fujian 353500, China |
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Abstract The accurate calculation of liquid pressure in the balance chamber is the key technology for axial thrust calculation of the impeller which has balance holes and double wear-rings on the centrifugal pump. The correction coefficient was cited, which is liquid pressure loss in the pump side chamber. The calculation of liquid pressure difference between the inlet of pump side chamber and rear wear-ring was resolved when there was liquid leaking in the side chamber. The IS80-50-315 type centrifugal pump whose speed had been reduced was taken as the research object. Specific area was changed by altering both the balance holes diameter and the rear wear-ring clearance. Then the characteristics of the mathematic model of liquid pressure in the balance chamber and axial thrust were researched under design conditions. The results show that the characteristic curves of the mathematic model for liquid pressure of the balance chamber can solve the key problem of the calculation of liquid pressure difference in the balance chamber under design conditions. The joint regulation by the two sluice valves, balance holes and rear wear-ring affects the axial thrust caused by liquid pressure difference in the area of ba-lance chamber. From the point of view of controlling axial thrust, the optimum matching relationship between the balance holes diameter and rear wear-ring clearance could be obtained according to the characteristic curve of axial thrust. The reliability of the mathematic model was verified by two test cases.
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Received: 05 March 2015
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| [1]MARJAN G,DUSAN F,BRANE S.Hydraulic axial thrust in multistage pumps-origins and solutions[J]. Journal of fluids engineering, 2002,124:336-341.[2]陆伟刚,张金凤,袁寿其.离心泵叶轮轴向力自动平衡新方法[J].中国机械工程,2007,18(17):2037-2040. LU Weigang,ZHANG Jinfeng,YUAN Shouqi.A new method to axial thrust self-balance for centrifugal pump impeller[J]. China mechanical engineering,2007,18(17):2037-2040.(in Chinese)[3]李伟,施卫东,蒋小平,等.屏蔽泵轴向力平衡新方法[J].农业工程学报,2012, 28(7): 86-90. LI Wei, SHI Weidong, JIANG Xiaoping, et al. New method for axial force balance of canned motor pump[J]. Transactions of the Chinese society of agricultural engineering, 2012, 28(7): 86 -90.(in Chinese)[4]LINO T, SATO H, MIYASHIRO H. Hydraulic axial thrust in multistage centrifugal pumps[J]. Journal of fluids engineering, 1980, 102: 64-69.[5]牟介刚,李思,郑水华,等.多级离心泵叶轮级间泄漏对轴向力的影响[J].农业机械学报,2010,41(7):40-44. MOU Jiegang,LI Si,ZHENG Shuihua,et al.Influence of interstage leakage on the axial force of the multistage centrifugal pump[J].Transactions of the Chinese society for agricultural machinery,2010,41(7):40-44.( in Chinese)[6]施卫东,李启峰,陆伟刚,等.基于CFD 的离心泵轴向力计算与试验[J].农业机械学报,2009,40(1):60-63. SHI Weidong,LI Qifeng,LU Weigang,et al.Estimation and experiment of axial thrust in centrifugal pump based on CFD[J]. Transactions of the Chinese society for agricultural machinery,2009,40(1):60-63.( in Chinese)[7]沈阳水泵研究所,中国农业机械化科学研究院.叶片泵设计手册[M].北京:机械工业出版社,1979.[8]丁成伟.离心泵与轴流泵原理及水力设计[M].北京:机械工业出版社,1981.[9]关醒凡.现代泵理论与设计[M].北京:中国宇航出版社,2011.[10]陆雄,范宗霖, 薛建欣.单级单吸离心泵后密封环加大量和平衡孔直径最佳值实验研究[J].水泵技术,1998(5): 3-9. LU Xiong,FAN Zongling,XUE Jianxin. The study of single-stage single-suction centrifugal pump based on increasing seal ring and balance hole diameter[J]. Pump technology, 1998(5):3-9.(in Chinese)[11]牟介刚,赵锦靖,郑水华,等.离心泵平衡孔位置对轴向力及外特性的影响[J].机械设计与制造,2012, 49(6):173-175. MOU Jiegang,ZHAO Jinjing,ZHENG Shuihua,et al.The influence of balance hole position of centrifugal pump on axial force and external characteristics[J].Machinery design & manufacture, 2012,49(6):173-175.(in Chinese)[12]陆雄,范宗霖,薛建欣.用改变平衡孔位置改善单级单吸离心泵轴向力[J].水泵技术,1998(6):7-13. LU Xiong,FAN Zongling,XUE Jianxin.The study of axial thrust by changing balance hole position in centrifugal pump[J].Pump technology,1998(6):7-13.(in Chinese)[13]刘在伦,王东伟,梁森.离心泵叶轮平衡孔液体泄漏量特性试验[J].农业机械学报,2012,43(7):85-88. LIU Zailun,WANG Dongwei,LIANG Sen. Fluid leakage characteristic test on balance aperture of centrifugal pump impeller[J]. Transactions of the Chinese society for agricultural machinery,2012,43(7):85-88.(in Chinese)[14]刘在伦,何睿,范赢.浮动叶轮平衡腔内液体泄漏量特性试验[J].农业机械学报,2011, 42(9):113-115. LIU Zailun,HE Rui,FAN Ying. Fluid leakage characteri-stics test on the balance cavity of the floating impeller[J]. Transactions of the Chinese society for agricultural machinery,2011,42(9):113-115.(in Chinese )[15]武汉水利电力学院,华东水利学院.水力学[M].北京:人民教育出版社,1979.[16]刘在伦,董玮,张楠,等.离心泵平衡腔液体压力的计算与验证[J].农业工程学报,2013,29(20):54-59. LIU Zailun,DONG Wei,ZHANG Nan,et al.Calculation and validation of fluid pressure of balance cavity in centrifugal pump[J]. Transactions of the Chinese society of agricultural engineering,2013,29(20):54-59.(in Chinese)[17]刘在伦,李琪飞.水力机械测试技术[M].北京:中国水利水电出版社,2009.[18]顾永泉.流体动密封[M].北京:石油大学出版社,1989.[19]何玉洁,周广凤,潘金秋,等.海水淡化多级泵轴向力试验[J].排灌机械,2009,27(2):108-109. HE Yujie,ZHOU Guangfeng,PAN Jinqiu,et al. Experiment for axial thrust of multi-stage pump for seawater desalination[J]. Drainage and irrigation machinery,2009,27(2): 108-109.(in Chinese)[20]王邦胜.叶轮前后口环直径对轴向力的影响[J].化工设备与管道,2012,49(1):35-38. WANG Bangsheng.Influence of diameters of rings at front and rear of impeller to axial force[J].Process equipment & piping,2012,49(1): 35-38.(in Chinese) |
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