|
|
|
| Comparison of bulb tubular pump unit′s support forms |
| Qiu Baoyun1, Pei Bei1, Shen Jian1, Feng Xusong2, Feng Xiaoli1 |
(1.School of Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu 225127, China; 2.Jiangsu Water Source Co. Ltd. of S-to-N Water Transfer Project, Nanjing, Jiangsu 210029, China) |
|
|
|
|
Abstract In order to optimize supporting structures of bulb tubular pump units and improve the properties, the supports of bulb tubular pump units were divided into 3 hierarchies， i.e. the bearing block support, the bulb support and the pump body support. The support forms of 3 typical bulb tubular pump units were investigated. The shaft deformations and fatigue strength safety factors were calculated through force analysis. Several typical support forms were compared in pump unit reliability, installation, maintainability and overall structure, and the pump system hydraulic performances. The design principles and methods of bulb tubular pump unit supports were put forward in bearing number and their arrangement and installation, the bulb supports and the pump body supports. The results show that supporting forms of bulb tubular pump units affect reliability, stability, installation and maintainability of the pump units and the pump system hydraulic performances. The flexivities of motor rotor and pump impeller reach 0.19~0.39 mm and 0.22~0.62 mm, respectively. The oil film thicknesses of journal bearings and rolling bearings are 0.41~0.53 mm and 0.12~0.17 mm, respectively. When determining the installation height of the bearing saddle, the flexivities of the rotor and the impeller and oil film thicknesses of the bearings should be considered so that the motor's air gap and the clearance between pump blade and shell are evenly distributed. The reliability and hydraulic performances of bulb tubular pump units could be improved by reasonably arranging guide bearings, adopting radiating plate support of the bulb, combining the maintenance channel and the main support which is under the bulb, and using the metal pipe pump structure. The achievements could provide references to optimum design of bulb tubular pump units.
|
|
Received: 02 February 2010
Published: 30 January 2011
|
|
|
|
| [1]谢伟东,卜舸,魏军.南水北调东线第一期工程江苏段低扬程泵站的机组选型研究[J].南水北调与水利科技,2005,3(1):4-6.Xie Weidong,Bu Ge,Wei Jun.Selecting model of set in low-lift-head pumping station in Jiangsu's first-stage of South-to-North Water Diversion Projeet[J].South-to-North Water Transfers and Water Science & Technology,2005,3(1):4-6.(in Chinese)[2]中水珠江规划勘测设计有限公司.灯泡贯流式水电站[M].北京:中国水利水电出版社,2009.[3]仇宝云.大中型水泵机组装置理论与关键技术[M].北京:中国水利水电出版社,2005.[4]吕建新,许跃华.大型灯泡式贯流泵CFD计算[J].排灌机械,2007,25(5):17-19.Lü Jianxin,Xu Yuehua.CFD calculation for large-scale bulb tubular pump[J].Drainage and Irrigation Ma-chinery,2007,25(5):17-19.(in Chinese)[5]刘大全,肖忠会,张文,等.滑动轴承非线性油膜力的一维直接解法[J].机械工程学报,2005,41(2):51-56.Liu Daquan,Xiao Zhonghui,Zhang wen,et al.Direct solution method of one-dimensional problem for nonli-near oil-film forces of sliding bearing[J].Chinese Jour-nal of Mechanical Engineering,2005,41(2):51-56.(in Chinese)[6]Yang Jinfu,Chen Ce,Yang Shengbo,et al.An analytic model of oil-film force on hydrodynamic journal bearing of finite length[C]∥2008 Proceedings of ASME Tur-bo Expo:Power for Land,Sea,and Air.Berlin,Ger-many:ASME,2008,5(B):947-952.[7]Zhao Sanxing,Dai X D,Meng G,et al.An experimen-tal study of nonlinear oil-film forces of a journal bearing[J].Journal of Sound and Vibration,2005,287(4/5):827-843.[8]刘秀英.圆柱滚子轴承最小油膜厚度计算公式的推导及应用[J].机械工程师.2006(2):66-67.Liu Xiuying.Computing formula and application of cylin-drical roller bearing's oil-film min-thickness[J].Me-chanical Engineer,2006(2):66-67.(in Chinese)[9]Dowson D,Higginson G R.Elasto-Hydrodynamic lubri-cation[M].SI ed.New York:Pergamon Press,1977.[10]殷玉枫,常争艳,刘中.滚柱轴承离合器油膜厚度的计算[J].润滑与密封,2006(10):148-150.Yin Yufeng,Chang Zhengyan,Liu Zhong.Film thick-ness calculation for roller bearing clutch[J].Lubrication Engineering,2006(10):148-150.(in Chinese) |
|
|
|
