给水泵汽轮机高压调节电液伺服阀紧固螺栓断裂分析  

Fracture Analysis on Fastening Bolt of Electro-Hydraulic Servo Valve for High Pressure Regulating in a Steam Turbine of Feed Water Pump

作　　者：刘明 王征军 吴刚 解鑫 Liu Ming;Wang Zhengjun;Wu Gang;Xie Xin(Huadian Electric Power Research Institute Co.,Ltd.,Hangzhou 310030,China;Hubei Huadian Xiangyang Power Generation Co.,Ltd.,Xiangyang 441000,Hubei Province,China)

机构地区：[1]华电电力科学研究院有限公司,杭州310030 [2]湖北华电襄阳发电有限公司,湖北襄阳991000

出　　处：《发电设备》2023年第1期36-40,共5页Power Equipment

摘　　要：针对某火电厂给水泵汽轮机高压调节电液伺服阀紧固螺栓发生断裂失效的问题,采用化学成分分析、硬度检测、显微组织分析、断口扫描分析及受力仿真计算等方法进行分析。结果表明:螺纹表面尤其是螺牙底部存在机加工缺陷,在安装预紧力过大导致第一根螺栓发生多源疲劳断裂,随后其他螺栓因静载荷过大直接发生瞬时韧性断裂。这可为电液伺服阀紧固螺栓的安装及检验提供借鉴。To solve the problem of the fracture failure of the fastening bolt of the electro-hydraulic servo valve for high pressure regulating in a steam turbine of feed water pump in a thermal power plant, analyses were carried out through following methods, such as chemical component analysis, hardness testing, microstructure analysis, fracture scanning analysis, force simulation calculation, etc. Results show that, the multi-source fatigue fracture of the first bolt is caused by the excessive pretightening force, while the instantaneous ductile fracture of the other bolts occurs directly due to the excessive static load, which is resulted from the manufactured defects existing on the thread surface, especially at the bottom of the screw teeth. This may serve as a reference for the installation and inspection of fastening bolts in electro-hydraulic servo valves.

关 键 词：给水泵汽轮机 电液伺服阀 螺栓 断裂 

分 类 号：TM621.[电气工程—电力系统及自动化]