保温保压取心工具球阀工作力学的有限元分析

Finite Element Analysis on the Mechanics of Ball Valve of Pressure and Temperature-preservation Coring Tool

运用ANSYS和Pro/E的交互式无缝连接技术,对现行GW194-70BYM型保温保压取心工具的球阀进行了有限元力学分析。分析结果表明,球阀仓的应力和变形数值分析计算结果与实物在40 MPa工作内压下实测数据非常接近;转轴在轴径变化的地方存在着较严重的局部应力集中现象,宜采用渐变过渡连接方式或适当增粗直径的方法进行解决;球阀仓在转轴的支撑处因结构不对称,在左上耳和右上耳部位的局部应力远大于材料抗拉强度极限,出现局部屈服的现象,降低了总体强度,建议增大左上耳和右上耳部位的几何尺寸。该项研究结果对于指导球阀机构的优化设计及提高其工作安全性具有重要意义。

Finite element analysis on the mechanics of the ball valve of the existing GW194 -70BYM type pressure and temperature-preservation coring tool is conducted by adopting the interactive seamless connection technology of ANSYS and Pro/E. The numerical analysis results of stress and deformation of ball valve cabin accord well to the measured results of ball valve cabin under an inner pressure of 40 MPa. The rotary shaft has serious local stress concentration where the shaft diameter changes, and gradual transition connection type or larger diameter are purposed to address the issue. The upper left ear and right ear of ball valve cabin, where shaft is supported, has a local stress that is far greater than the tensile strength limit due to an asymmetric structure, resulting in a local yielding phenomenon, reducing the overall strength of ball valve cabin. Enhanced geometric dimension for the up- per left ear and right ear is recommended. The results of the study could provide guide to the design and optimization of ball valve and the improvement of ball valve safety.