反应堆压力容器法兰面沟槽尺寸参数对其金属O形环密封性能的影响

基于二维轴对称非线性弹塑性模型，对反应堆压力容器(RPV)用Inconel 718合金O形环进行了有限元分析，在试验验证的基础上探讨了筒体法兰面安装沟槽深度、沟槽间隙等关键参数对密封性能的影响。结果表明：镀银层对O形环的变形行为无实质影响，在进行有限元分析时可忽略镀银层；沟槽深度和沟槽间隙是影响O形环密封性能的关键参数，所涉及的RPV用金属O形环的最佳有效沟槽深度在(11±0.25) mm范围内、沟槽间隙取0.6 mm左右为宜。此外，O形环的安装和制造要求均极为苛刻，为保证O形环与沟槽间距的均匀性应严格控制好制造和安装等工序尺寸参数，从而提高密封性能。

Effect of Groove Dimension Parameter of Flange Face on Sealing Performance of Metal O-ring for Reactor Pressure Vessel

The analysis of Inconel 718 alloy O‐ring of reactor pressure vessel (RPV) was conducted by finite element method (FEM ) with two‐dimensional nonlinear elastoplastic model .Based on the verification with experiments ,the influences of the groove depth , groove gap on the flange ring slot on the sealing performance were investigated .The results show that the silver coating has no remarkable effect on deformation characteris‐tics of O‐ring ,so the silver coating can be ignored w hen the O‐ring is analyzed by FEM . The groove depth and groove gap are the key parameters which have important effect on the O‐ring sealing performance .For the O‐ring involved with RPV ,the optimal values of the groove depth and the groove gap are around (11 ± 0.25) mm and 0.6 mm respec‐tively .In addition ,the O‐ring has high requirements to the manufacture and installa‐tion ,and it is necessary to improve its dimensional accuracy in order to ensure its sealing performance ,especially to keep the distance uniform between the O‐ring and groove .