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1·In the light of the key technique of the down-hole driven progressive cavity pump (PCP) for oil production, a power distributional planetary reducer is proposed.

针对井下驱动螺杆泵的关键技术问题，提出了用于井下直接驱动螺杆泵的功率分流式行星减速器。

2·Performance characteristic and stress condition were analyzed in the process of progressive cavity pump well startup and a startup torque dynamic model was established.

对启动过程中单螺杆泵的运动特点和受力情况进行分析，建立了该系统启动扭矩动力学模型。

3·As the increase of the pressure difference, the contact pressure increases, the contact pressure of iso-wall thickness progressive cavity pump is larger than that of common one.

随着压差的增加接触压力相应增加，等壁厚螺杆泵比普通螺杆泵接触压力大；

4·This unit features two 128-gallon (480 liters) mixing tanks, a 30-gallon (118 liters) holding hopper and a flanged inlet progressive cavity grout pump.

该机组具有两个128加仑(480公升)混合灌、一个30加仑(118公升)料斗和一个带凸缘的灌浆泵。