主机构为导杆机构的游梁式抽油机性能分析与评价

摘要

For analysis and assessment on performance of a state-of-art pumping units with guide bar mechanism, analytic methods were provided in this paper for analyzing their movements and kinetic features. Depending on the dimension of the prototype, movements and kinetic features of suspension points in the pumping units, together with stresses on major components and torques of the gear box were determined. The results show that the pumping units have relatively high crank angles between extreme positions. Velocities of suspension point during upward stroke can be seen as constant approximately. These movements may contribute to energy conservation in certain indicator diagrams. However, movements in upward and downward strokes displayed poor smoothness. Consequently, beams may be deployed to balance the system. Crank may produce significant stresses with alternating directions on the beam. The pumping units with this structure can effectively satisfy demands of miniature pumping units with low strokes in oilfields.%为了对主机构为导杆机构的新型抽油机进行性能分析与评价，本文给出了其运动、动力分析的解析方法。结合典型样机的尺寸，分析了该抽油机的悬点运动、动力特性、主要构件的受力特征和减速箱上的力矩特征。分析表明：该抽油机极位夹角较大，上冲程的悬点速度可近似为匀速，对于特定的示功图，有节能效果。但上、下冲程的运动平顺性较差，一般需采用游梁平衡方式，曲柄作用在游梁上的载荷较大且方向交变。该结构适合在低冲次、小型抽油机选用。