井下螺杆泵 meaning in Chinese

subsurface progressive cavity

But , at the present situation , the down hole progressing cavity pump is driven by the motor and reducer placed on the ground via a thin and long rod , and this cause troubles easily because of the rod works in cycling bending and distortion
目前螺杆泵采油系统采用地面电机和减速装置通过细长抽油杆驱动井下螺杆泵，这种驱动方式由于抽油杆旋转时处于长期循环扭曲状态，系统很容易出现故障。
By analyzing the different kinds of in use reducer and integrating the current research and considering the down hole operating condition , a kind of closed loop power distributional planetary gear reducer is put forward as a proper reducer to directly connecting the motor and the progressing cavity pump
对目前使用的各种减速器进行结构分析和论证，结合国内外的研究和设计情况，并根据井下螺杆泵的工作条件，提出封闭式功率分流行星减速器作为联接潜油电机驱动螺杆泵工作的减速器的方案。