大型立式轴流泵运行安全可靠性分析及改造  

Operation safety and reliability analysis of large vertical axial flow pump and its transformation

作　　者：张宇 李扬[2] 仇建春 ZHANG Yu;LI Yang;QIU Jian-chun(Water Resources Management Office of Taihu Lake in Jiangsu Province, Suzhou 215128, China;Jiangdu Water Management Division of Jiangsu Province, Yangzhou 225200, China;College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, China;State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China)

机构地区：[1]江苏省太湖地区水利工程管理处,江苏苏州215128 [2]江苏省江都水利工程管理处,江苏扬州225200 [3]扬州大学水利科学与工程学院,江苏扬州225009 [4]河海大学水资源高效利用与工程安全国家工程研究中心,南京210098

出　　处：《沈阳工业大学学报》2022年第3期306-315,共10页Journal of Shenyang University of Technology

基　　金：国家自然科学基金项目(51879121,51779107);武汉市科技成果转化项目(2018060403011350).

摘　　要：南水北调东线工程江都第四抽水站在运行中发生了叶轮外壳气蚀严重、内嵌不锈钢开裂、叶片调节机构受油器发热抱死、叶轮密封老化导致漏油等故障,在进行维修性处理后,有必要对轴流泵可靠性进行分析验证.采用数值模拟技术从流场速度与静压分布、刚强度、拉杆受力等方面进行分析评估.分析结果验证了叶片、转臂的安全性,确定液压站外置、系统油路复杂是渗漏油故障多发的根源,提出并实施了内置式叶片调节机构改造,成功消除了渗漏油的隐患.Aiming at the problem emerging during the operation of Jiangdu No.4 pumping station on the east line of South-to-North Water Transfer Project,such as the serious cavitation erosion of impeller shell,the cracking of embedded stainless steel,the heating and locking of oil receiver in blade regulating mechanism,the oil leakage caused by the aging of impeller seal etc.,it is necessary to study and verify the reliability of axial flow pump after the maintainability treatment.The numerical simulation technology was used to analyze and evaluate the flow field velocity,static pressure distribution,stiffness and strength,tension rod force and other factors.The analysis results verify the safety of blades and rotating arms,and further determine that the external hydraulic station and the complex oil circuit system are the origins of frequent oil leakage faults.The modification of built-in blade regulating mechanism was proposed and implemented,and the hidden danger of oil leakage was successfully eliminated.

关 键 词：轴流泵 叶轮外壳 气蚀 叶片调节机构 叶轮密封 流体动力学 数值模拟 力学性态 

分 类 号：TV675[水利工程—水利水电工程]