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- The influence of the injected gas volume on the output performanc e of positive displacement motor (PDM) is obvious in the process of aerated UBD. 在充气欠平衡钻井过程中,气体的注入量对马达的输出特性影响较大。
- Calculation results show that greater friction force exist between drill stem and wall of bore in tripping out and drilling using PDM (positive displacement motor) working conditions. 计算结果表明，起钻和井底动力钻具钻进两种工况，钻柱与井壁间有较大的摩擦力。
- Keywords positive displacement motor;shaft bearing assembly;hydraulic thruster;discussion; 螺杆钻具;轴承总成;液力推进器;探讨;
- positive displacement motor 容积式马达
- The roots is the oldest type of positive displacement supercharger. 根是确定的最老的类型替代增压器。
- Slurry is metered to the tine by a positive displacement pump. 用一台容积泵测量泥浆尖头。
- Compressor may be reciprocating positive displacement or centrifugal. 压缩机可以是活塞式、螺杆式或离心式。
- positive displacement motors 正位移马达
- Pumps in which displacement is accomplished mechanically are called positive displacement pumps. 用机械方法完成位移的泵称为正位移泵。
- The timing pump is a positive displacement pump set to ensure that product flows through the entire system at a predetermined and acceptable rate. 这种调速泵是一个容积式泵,用来确保产品以确定的可接受的速率流过整个设备。
- Most downhole power drills for horizontal drilling are constituted basically by positive displacement drills. 绝大多数的水平井井下动力钻具是以螺杆钻具为基础构成的。
- Results Gnathion and gonion showed positive displacement on X and Y axes and negative displacement on Z axis. 颏顶点、下颌角点均表现为X、Y轴向的正位移,Z轴向的负位移。
- Petroleum and natural gas industries - Rotary-type positive displacement compressors - Part 1: process compressors (oil-free). 石油和天然气工业。旋转型容积式压缩机。第1部分:加工压缩机(无油)
- When ready to start centrifugal pumps, fully open suction valves and throttle discharge valves of a positive displacement. 当准备好启动离心式泵时，吸入阀全开，容积式排出阀节流。（关于装置开车）
- The same powerful positive displacement blower technology used in large truck mounted vacuums is employed in the SAVE-YOUR-BACK-VAC. 吸尘器上还使用了同样强大的正排量鼓风机技术。
- A rotor displacement in the negative direction produces a positive torque and a positive displacement results in a negative torque. 转子朝负向移动，产生正向扭矩，反之，朝正向移动就产生负向扭矩。
- Variable Displacement Pump-Fixed Displacement Motor 变量泵一定量马达
- positive displacement hydraulic motor 容积式液压马达
- double-action variable displacement motor 双向变量马达
- Axial piston fixed displacement motors, Series 20, are of swash plate design with a preset constant displacement, and they are intended for closed circuit operation. 轴向柱塞泵固定位移电机，系列20，是吓唬板设计，预置常数流离失所，他们的目的是为闭路电视作业。
