变速率驱动特征下的抽油泵球阀运动行为分析

柔性控制运转技术是一种合理的变速驱动技术，目的是改善游梁抽油系统采油工作过程，减少损耗，提高采油效率。为探寻柔性驱动应具有的抽油泵内阀球运动规律，分析了上冲程时固定阀的开启压力、阀球运动的受力特性、初始条件和边界条件；分析了常规圆速率(工况1)、椭圆速率(工况2)、椭圆短轴短边速率(工况3)、椭圆短轴长边速率(工况4)、椭圆长轴短边速率(工况5)、椭圆长轴长边速率(工况6)等6种驱动工况下固定阀阀球运动规律的优劣性，并得到了柔性驱动应具备的特点；最后通过台架试验验证了理论分析的正确性。研究表明:柔性驱动应具备3大特点；泵阀需要长时间具有良好的工作性能时，6种驱动工况中最佳驱动为工况2，最差驱动为工况6。

Analysis of the motion behavior of the ball valve of the oil well pump under the characteristics of variable rate driving

The flexible control operation technology is a reasonable variable speed drive technology, which aims to improve the production process of beam pumping system, reduce the loss and improve the production efficiency. In order to explore the motion law of the valve ball in the flexible drive oil well pump, the opening pressure of the fixed valve during the up stroke, the force characteristics, initial conditions and boundary conditions of the valve ball motion are analyzed. The advantages and disadvantages of the motion law of the fixed valve ball under six driving conditions, such as conventional circular velocity (working condition 1), elliptical velocity (working condition 2), elliptical short axis short edge velocity (working condition 3), elliptical short axis long edge velocity (working condition 4), elliptical long axis short edge velocity (working condition 5), elliptic long axis long side speed (working condition 6)are analyzed, and the characteristics of flexible driving are obtained. Finally, the correctness of the theoretical analysis is verified by bench test. The results show that: flexible drive should have three characteristics; when the pump and valve need to have good working performance for a long time, the best driving condition is condition 2 and the worst driving condition is condition 6.