考虑疲劳影响的蝶阀阀轴计算方法研究

Study on Calculation Method of Butterfly Valve Shaft Considering Fatigue Effect

阀轴是蝶阀的关键受力部件,传统方法基于扭矩计算阀轴应力而未充分考虑弯矩的影响,应用于大型蝶阀设计存在一定的风险。本文分别将滑动轴承支反力简化为均布载荷和集中力,与变形协调方程相结合,提出了一种新的阀轴弯扭组合数学模型,采用有限元方法和实验方法对数学模型进行了验证;最后,分别采用冯·密斯应力和Goodman准则对阀轴应力进行评定,得到阀轴设计安全系数。结果表明,本文提出的阀轴计算数学模型与评估方法具有较高的精度,对改进蝶阀设计方法具有重要指导意义。

The valve shaft is the key force component of butterfly valve,the traditional calculation method of the valve shaft stress is based on the torque which not fully considers the bending moment effect,so there exist the certain risks for applying to the large butterfly valves design.In this paper,the sliding bearing constraint force is simplified to uniform distributed-load or concentrated force,by combining with the compatibility equation,then a new model for valve shaft bending and torsion combination is proposed,thus finite element and experimental method is used to verify the present model.Finally,the valve shaft stress is evaluated with the Von Mises stress and Goodman criteria respectively,and the safety factor of the valve shaft design is obtained.The results show that the given model and evaluation method of the butterfly valve shaft calculation perform with high precision,which are of the important guiding significance to improve the design method of butterfly valve.