调径变矩型抽油机的优化设计与平衡效果分析

调径变矩型抽油机将常轨游梁平衡型抽油机的后臂下偏一个角度，变力臂、变配重，实现了变平衡力矩。文章对其几何尺寸与平衡参数进行了优化设计，证实该机型曲柄轴的均方根扭矩比异相型减少了31．2％，最大扭矩减少了35.3％，平衡效果显著。但净扭矩曲线存在负值，建议增加曲柄二次平衡，设计成复合平衡型抽油机。

Optimization Design and Balance Analysis of Beam Pumping Units with Adjustable Radius and Change Moment

The beam pumping units with adjustable radius and change moment can change balance moment. The geometric dimensions and balance parameters of the beam pumping units are optimized. As a result, Me is re- duced 31.2% and Mnmax is reduced 35.3% than phased balance. But net torque curve of crankshaft exists negative . The compound balance beam pumping units is put forward.