基于ANSYS的可在线带压更换阀杆密封组件式全焊接球阀球体应力和变形研究

Research on Stress and Deformation of Ball of Fully Welded Ball Valve of Replacement Stem Seal with Online Pressure Assembly Based on ANSYS

摘要: 针对某公司设计的可在线带压更换阀杆密封组件式全焊接球阀球体，利用SolidWorks建立三维模型，然后导入ANSYS软件，通过分析全焊接球阀球体在3种工况下的应力和变形。由实验数据可知，球体的最大变形产生在流道边缘，球体上转轴根部的最大应力约为368 MPa，大于球体材料的屈服强度，产生局部应力集中；而球体外壁和流道内壁的应力均小于材料的许用应力。球体的最大变形产生在流道边缘处；密封面处的变形较大；由于在最大压差下受介质的作用，进口端阀座和介质接触侧球体的变形较为明显。研究表明，通过适当增大球体转轴根部过渡圆角半径有利于改善局部应力集中状况，本研究可为全焊接球阀设计与制造提供参考依据。

Abstract: Aiming at the fully welded ball valve of replacement stem seal with online pressure assembly de-signed by a company, the three-dimensional model is established by SolidWorks, and then the ANSYS software is imported to analyze the stress and deformation of all welded ball valve under three working conditions. According to the experimental data, the maximum deformation of the sphere occurs at the edge of the flow channel, and the maximum stress of the sphere occurs at the root of the rotating shaft on the sphere, which is 368 mpa; the maximum stress is greater than the sphere of material yield strength; the local stress concentration is occurred. While the stress of the outer wall of the sphere and the inner wall of the flow channel is less than the allowable stress of the material. The maximum deformation of the ball occurs at the edge of the flow channel; the de-formation of the sealing surface is larger. Due to the effect of the medium under the maximum pressure difference, the deformation of the ball on the contact side of the inlet valve seat and the medium is more obvious. The results show that the local stress concentration can be improved by appropriately increasing the fillet radius at the root of the ball shaft. This study can provide a ref-erence for the design and manufacture of all welded ball valve.