基于泄漏率预测模型的蝶阀密封性能研究OA北大核心CSTPCD

In order to improve the sealing performance of containment isolation valves under accident conditions,a leakage rate prediction method was proposed for a DN250 butterfly valve.Combining numerical simulation of the contact interface gap flow of the sealing pair at the micro scale and simulation of the mechanical deformation characteristics of the sealing pair at the macro scale,a quantitative relationship between the leakage rate and various factors was established.By comparing the results with experimental measurements,the effectiveness of the model was verified.The model was applied to the analysis of factors affecting sealing performance,and the results show that reducing the roughness of the sealing surface,increasing the interference amount of the sealing pair,and strictly preventing the negative angle displacement of the valve plate can effectively control the leakage rate of the butterfly valve.However,the influence of material hardness on the leakage rate is not significant.Based on the analysis,a method was proposed to determine the minimum interference amount of the valve sealing pair using the leakage rate as a direct indicator,which can effectively guide the design and maintenance of valve sealing pairs.