泵杆

Optimizing the Pumping Parameters(Length of Stroke,Pumping Speed, Plunger diameter and Pump depth) of Sucker-rod Pumping System is a mixed discrete optimization Problem.

优选有杆泵抽油井的抽油参数：冲程、冲次、泵径和下泵深度是一个混合离散变量的优化问题。

The new technology makes the sucker rod string downwards easily by applying a downward hydraulic force at the bottom of the hollow sucker rod string, which effectively solves the problem of large drag force on the downstroke in the present technology of this kind.

介绍了一种新型空心杆采油工艺技术，这种技术采用了具有液力反馈原理的空心杆抽油泵，该泵的特点是能有效地减小空心杆的下行阻力，并能增加抽油杆的下行动力。

The optimal design methods of submergence pump depth and other swabbing parameters were presented.

通过分析有杆泵抽油系统的能耗，以机采系统效率最高为目标，确立了机采系统优化设计的目标函数和约束条件，同时分析泵效对机采系统效率的影响以及影响泵效的因素，给出了沉没度和其他抽汲参数的优化设计方法。

A change in single-screw pump suction valve opening degree, when the suction vacuum is small, pump parameters changed little, and when the suction vacuum is larger, the pump working conditions deteriorated dramatically.

改变单螺杆泵吸入口阀门开启度，当吸入口真空度较小时，泵特性参数变化不大，而当吸入口真空度较大时，泵的工作状况急剧恶化。

Screw pump is a single-screw transfer pump.

螺杆泵是一种单螺杆输运泵。

Screw mainly by the pump shell and one or more screw posed.

螺杆泵主要由泵壳与一个或一个以上的螺杆所构成。

Study on the rubber stator compoundof one step injection screw drilling tool;2. he paper presents a test method to research the dynamic property of the rubber stator for screw pump,compares the result of static and dynamic tests and selects the formulation according to the tests.

提出研究螺杆泵定子橡胶动态性能的试验方法，对静态试验及动态试验结果进行对比，并应用其试验对配方进行筛选，结果表明，橡胶压缩温升试验能较好地表征螺杆泵定子橡胶的动态性能，为橡胶定子的研究提供了较为可靠的依据，并在实际应用中得以证实。

The theories established in this paper give directions to the current design and produce of the three screw pump; and also give solutions of the problems during usage.

本文的基础理论研究对当前的螺杆泵的设计生产都有很好的指导作用，对当前三螺杆泵使用中出现的问题有很好的解决效果。

Screw pump features: the loss of small screw pump, good economic performance.

螺杆泵特点为：螺杆泵损失小，经济性能好。

Against the screw on the different wells specific measures to improve system efficiency, making Erlian screw oil wells on the management level to a higher level.

针对该情况对不同的螺杆泵井提出了具体提高系统效率的措施，使得二连油田螺杆泵井的管理水平上了一个台阶。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。