弯管式混流泵导叶体维修探索

Exploration on maintenance of guide vane body of elbow mixed flow pump

水泵运行中常有叶片气蚀、主轴颈磨损、导轴承损坏等问题,导叶体损坏虽不常见,但因其作用重要,维修困难,损坏后危害大,必须高度重视。以沙集泵站为例,在初步分析导叶体损坏原因基础上,得出导叶体与橡胶轴承上下止口的配合间隙是导叶体维修的关键控制因素。从适用情况、实施时长、费用、优缺点和效果等方面,分析比较垫青稞纸、镶内衬、加装新法兰、焊接连接螺栓和锥形止口等导叶体维修方案,得出垫青稞纸方案未能完全改善导叶体止口受力,镶内衬方案的台阶易损坏致使内衬脱落,加装新法兰后因原法兰打孔较多而强度降低,焊接连接螺栓方案间隙调整困难,锥形止口方案费用较高但承载能力强且运行可靠性高,效果最优。

Problems such as blade cavitation,wear of main journal and damage of guide bearing often exist in the operation of water pump.The damage of guide vane body is not common,but it is difficult to maintain due to its important role and great harm after damage,which must be paid great attention to.Taking Shaji pump station as an example,based on the preliminary analysis of the damage causes of the guide vane body,it is concluded that the matching clearance between the guide vane body and the upper and lower stop of the rubber bearing is the key control factor for the maintenance of the guide vane body.From the aspects of application,implementation time,cost,advantages,disadvantages and effects,the maintenance schemes of guide vane body such as pad highland barley paper,lining,adding new flange,welding connecting bolt and conical stop are analyzed and compared.It is concluded that the pad highland barley paper scheme fails to completely improve the stress at the stop of guide vane body,and the steps of lining scheme are easy to be damaged,resulting in lining falling off,After the new flange is installed,the strength of the original flange is reduced due to more holes,the gap adjustment of the welded connecting bolt scheme is difficult,and the conical stop scheme has high cost,but strong bearing capacity,high operation reliability and optimal effect.