电厂球阀的结构设计及强度性能仿真

Structural Design and Strength Performance Simulation of Power Plant Ball Valve

电厂球阀结构设计不合理是电厂生产效率降低、事故发生的重要因素,为改善电厂球阀的结构设计,对球阀结构的既往设计流程、设计经验进行梳理。首先,针对球阀结构设计中的球体半径、最小壁厚的设计方法进行介绍,给出计算结果,球体设计半径21.27 mm,最小壁厚取5 mm。其次,就阀体最小壁厚进行一次薄膜应力、一次薄膜应力加弯曲应力校核,校核结果满足设计标准的要求。最后,基于有限元理论对设计球阀阀口的强度进行性能仿真分析,通过Solidworks构建球阀的几何模型,有序完成三维模型的构建、有限元方针条件的设定、材料属性的确定、智能网格的划分、施加约束与载荷等工作,利用ANSYS软件验证其设计强度。有限元仿真结果显示,球体最大应力区的应力数值明显低于WCB材料的许用应力,设计球阀阀门的强度性能稳定。

The unreasonable structural design of power plant ball valve is an important factor for the reduction of production efficiency and accidents.In order to improve the structural design of power plant ball valve,the previous design process and design experience of ball valve structure were combed.Firstly,the design method of sphere radius and minimum wall thickness in the structural design of ball valve was introduced,and the calculation results were given.The sphere design radius was 21.27 mm and the minimum wall thickness was 5 mm.Secondly,the primary membrane stress,primary membrane stress and bending stress were checked on the minimum wall thickness of the valve body,and the check results met the requirements of the design standard.Finally,based on the finite element theory,the performance simulation analysis of the strength of the designed ball valve port was carried out.The geometric model of the ball valve was constructed through SolidWorks,the construction of three-dimensional model,the setting of finite element policy conditions,the determination of material properties,the division of intelligent grid,the application of constraints and loads were completed in order,and the design strength was verified by ANSYS software.The finite element simulation results show that the stress value in the maximum stress area of the ball is significantly lower than the allowable stress of WCB material,and the strength performance of the designed ball valve is stable.