混流式机组顶盖座环把合螺栓失效分析
Fracture Analysis of Connecting Bolt of Top Cap and Seat Ring of Hydro Turbine
李文波 1胡钰婧 1赵倬 2黄蓉 3莫剑 4王辉斌 1沈丁杰 1赵强 5张军 1邹谨成1
作者信息
- 1. 国网湖南省电力有限公司电力科学研究院,湖南省长沙市 410000
- 2. 国网湖南省电力有限公司水电分公司,湖南省长沙市 410000
- 3. 湖南省湘电试验研究院,湖南省长沙市 410000
- 4. 国网湖南省电力有限公司,湖南省长沙市 410000
- 5. 国网新源控股有限公司抽水蓄能技术经济研究院,北京市 100000
- 折叠
摘要
混流式水轮发电机组顶盖座环把合螺栓是紧固座环和顶盖的重要部件.本文通过对顶盖座环把合螺栓的制造质量、安装质量进行检测与分析,阐明了某混流式水电厂水轮发电机组顶盖座环把合螺栓断裂故障的原因:①螺栓质量不合格,螺栓本体结构形式设计不合理,螺栓显微组织中存在网状铁素体,力学性能不合格;②螺栓安装预紧力不足,顶盖座环把合螺栓安装伸长值低于设计要求,导致螺栓在机组运行中可能松动;③机组振动超标严重,在螺栓服役过程外加载荷造成螺栓松动.
Abstract
The coupling bolt is an important part of connecting the main shaft and the main shaft and the rotating wheel.This article clarified the coupling bolt fracture failure reason of a certain hydro turbine through analyzing the manufacturing quality and installation quality of the coupling bolt.The fracture reasons of the coupling bolt could divided into two parts:① the bolt strength is unqualified.The quench depth is less than the radius of the bolt,lead to uneven microstructure and the formation of the ferrite network,furthermore,resulting in the unqualified strength of the bolt;② the pretension stress of the bolt is insufficient.The installation elongation value of the coupling bolt is lower than the design value,causing insufficient installation pretension stress of the coupling bolt;③ The vibration of the unit exceeds the standard seriously,and the bolt looseness is caused by the external load during the service of the bolt.
关键词
顶盖螺栓/预紧力/振动/断裂Key words
coupling bolt/fracture/pretension stress/vibration引用本文复制引用
基金项目
国网湖南省电力有限公司基金项目(5216A5220020)
出版年
2024
NETL
NSTL
万方数据