立式三螺杆泵运行平稳，噪音低。
图1表示三螺杆泵的剖视图。
所以对三螺杆泵的理论研究是非常必要的。
It's necessary to investigate the theory of the three screw pump.
于是在研究中主要是对三螺杆泵做基础理论的研究。
The main aim in this paper is the basic theory of the three screw pump.
外观形式不同，立式三螺杆泵是立着的而卧式泵是横卧着。
Different form appearance, vertical pump is standing and horizontal pump is lying.
只要选型得当，维护合理，三螺杆泵就可保证令人满意的运行。
As long as the selection of appropriate, to maintain a rational, three-screw pump can ensure satisfactory operation.
立式三螺杆泵采用机械密封加骨架油封双重密封方式，无泄露。
Vertical three-screw pump adopts double seal mechanical seal and framework oil seal, no leakage.
立式三螺杆泵内部结构简单紧凑，效率高、具有很强的自吸能力、节能效果好；
Vertical three-screw pump internal simple and compact structure, high efficiency, strong self-priming capacity, energy saving effect is good;
以135型三螺杆泵为例，对螺杆几何参数设计、螺旋型面的形成、螺杆啮合特性进行了探讨。
By taking 135 three-screw pump as an example, the geometric parameter design, the forming of spiral surface and the characteristic of screw gearing are investigated.
维修难度不同 ，立式三螺杆泵检修难度大 ，如检修叶轮需将上部全部移去后方能进行 ；
Maintenance difficulty is different, vertical pump maintenance is difficult, such as repair impeller should be the upper can all move to the rear;
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。
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.
从三元复合驱螺杆泵举升技术现状出发，分析了螺杆泵举升在三元复合驱应用的适应性，给出了螺杆泵举升技术的应用效果。
Starting with the current situations of the screw pump lifting, this paper analyzes the adaptability of the screw pump lifting in alkali-surfactant-polymer flooding and poi...
从三元复合驱螺杆泵举升技术现状出发，分析了螺杆泵举升在三元复合驱应用的适应性，给出了螺杆泵举升技术的应用效果。
Starting with the current situations of the screw pump lifting, this paper analyzes the adaptability of the screw pump lifting in alkali-surfactant-polymer flooding and poi...
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