基于有限元的双道金属O形环压紧力分析

Analysis of Double-Sealing Metal O-ring Pressing Force Based on Finite Element

双道金属O形环是反应堆压力容器常用的密封结构。为研究在双道密封下金属O形环所需最小压紧力的计算公式,利用ANSYS有限元软件,建立金属O形环二维轴对称模型,求出在相同压缩率下单道与双道密封压紧力值。建立双道密封压紧力计算的修正公式,通过比较双道密封压紧力有限元值和理论值,得出双道密封的修正系数。结果表明:密封环中心圆直径一定,在相同压缩率下,单道密封环所受压紧力要小于双道的第一道密封环压紧力。当第一道密封修正系数取1.021,第二道密封修正系数取1.028时,修正公式计算的最小压紧力值与有限元计算值吻合。

Double-sealing metal O-ring is a commonly used sealing structure for reactor pressure vessels.In order to study the calculation formula of required minimum pressing force of double-sealing metal O-ring, the ANSYS finite element software was used to establish a two-dimensional axisymmetric model of metal O-ring, and the values of the pressing force for single channel seal and double seal at the same compression rate were obtained.The correction formula for calculating the pressing force of double seal was established, and the correction coefficient of the double seal was obtained by comparing the finite element values and theoretical values of the pressing force of the double seal.The results show that the diameter of the center circle of seal ring is constant, and under the same compression rate, the pressing force of the single seal ring is smaller than that of the first seal ring of double seal.When the correction coefficient of the first seal is 1.021,the correction coefficient of the secondary seal is 1.028,the minimum pressing force calculated by the correction formula is consistent with the calculated value of the finite element.