美国研制成功一种自旋转柱塞抽油泵 ,可大幅度延长严重出砂井有杆泵的使用寿命 ,经济效益十分显著。这种泵的泵体与柱塞刚性连接 ,泵体外表面有螺旋槽 ,螺旋槽经通道与泵内部相通。在泵工作过程中 ,下冲程时原油可通过上冲程时被游动阀堵住的孔进入柱塞 ,然后由柱塞内通道进入 The United States successfully developed a self-rotating plunger pump, can greatly extend the service life of serious sand well rod pump, the economic benefits are significant. The pump body is rigidly connected with the plunger, the outer surface of the pump body has a spiral groove, and the spiral groove communicates with the pump interior through the passage. During the pump operation, during the down stroke, the crude oil can enter the plunger through the hole blocked by the traveling valve during the up stroke and then enter through the plunger inner passage