电动闸阀接管强度可靠性设计与分析

Design and Calculation for the Motor-operated Gate Valve Inlet-Pipe Strength Reliability

为提高核级电动闸阀接管强度运行可靠性,以高温高压电动闸阀(DN20)为例,对阀体连接管处结构进行了强度设计及可靠性分析。按照RCC-M标准规范要求,完成接管连接处强度和受力分析,以及最小壁厚设计。在此基础上,考虑材料性能、载荷、关键结构尺寸等不确定性影响,基于随机有限元分析方法,完成了接管强度的可靠性分析。给出了管端载荷、肩台处弯曲半径及表面划痕对接管可靠性影响较大的分析结果。提出了通过加强制造和安装质量、定期检测支吊架工作状态、适当增大弯曲半径等方法可提高阀门接管的可靠性。

To improve the strength and reliability of nuclear grade electric gate valve inlet-pipe,the strength design and reliability analysis of valve inlet-pipe are carried out for the DN20 electric gate valve with high temperature and high pressure.Firstly,based on RCC-M standard specification,the strength and stress analysis of valve inlet-pipe and the minimum thickness design are completed.And then,considering the uncertainty of material performance,load and key structure size,the reliability analysis is performed based on stochastic finite element method.Results illustrates that the pipe end load,the bending radius at the shoulder and the surface scratch have great influence on the reliability of the valve inlet-pipe.The reliability of the valve inlet-pipe can be improved by strengthening the installation quality,regularly detecting the working points of the supports and hangers,and appropriately increasing the bending radius,which can be applied in the design improvement work.