摘要
近年来,国内外核电厂出现了多起电动楔形闸阀阀杆弯曲的缺陷。虽然阀杆的屈曲可以通过压杆稳定性分析方法进行校核,但国内对于承受额外弯矩的阀杆屈曲校核方法的研究却相对缺乏。因此,本论文针对这一问题展开了研究。防转臂是闸阀上一种常见结构件,但其设计不当可能会对阀杆的稳定性造成影响,本文对核电站闸阀防转臂的功能进行了说明,并对两种不同结构的防转臂(平衡型/非平衡型防转臂)对阀杆受压稳定性的影响进行分析,主要结论是非平衡型防转臂会在闸阀关闭时对阀杆引入一个额外弯矩,导致阀杆的压杆稳定性降低,使阀杆弯曲的受力阈值降低。对于额外引入弯矩时的阀杆屈曲校核问题,本文提供一种使用RCCM规范中ZVI2216篇的方法进行带额外弯矩的压杆稳定性校核方法,并按实际阀杆屈曲形貌给出长度系数在1~2间取值的建议。
In recent years,the bending defect of electric wedge gate valve stem has occurred several times in nuclear power plants at home and abroad.The buckling of the valve stem can be checked by the method of compression stem stability analysis.However,there is a lack of research on the buckling checking method of the valve stem with additional bending moment in China.Therefore,this paper has launched research on this problem.Anti-swivel arm is a common structural part of gate valve,but its improper design may affect the stability of valve stem.In this paper,the function of the anti-rotation arm of the nuclear power plant Gate valve is explained,and the influence of two different anti-rotation arms(balanced/unbalanced anti-rotation arm)on the stability of the valve stem is analyzed.The main conclusion is that the non-balanced anti-rotation arm will introduce an extra bending moment to the valve stem when the Gate valve is closed,which will lead to the decrease of the stability of the valve stem and the decrease of the stress threshold of the valve stem Bends.In order to solve the problem of buckling checking of the valve stem with additional bending moment,this paper provides a method to check the stability of the compression bar with additional bending moment by using the method of ZVI 2216 in RCCM code,and gives a suggestion that the length coefficient should be between 1 and 2 ac-cording to the actual buckling morphology of the valve stem.
作者
陆洋
谭志
徐振
LU Yang;TAN Zhi;XU Zhen(China Nuclear Power Operations Co.,Ltd.,Shenzhen 518026,Guangdong,China)
出处
《阀门》
2024年第6期721-725,共5页
VALVE MAGAZINE
关键词
防转臂
闸阀
阀杆
压杆稳定性
屈曲校核
anti-rotation arm
gate valve
stem
stability of compression bar
buckling analysis
