单级输油泵的设计.doc

单级输油泵设计 摘要： 输油泵是用来将油从一个地方输送到另一个地方的设备，主要用于油田和炼厂。 输油泵的种类很多，对于单吸离心泵存在四大难题：1，提高泵效；2，消除H—Q曲线驼峰问题；3，大流量 过载；4，提高汽蚀余量。 本文针对离心泵的难题，具体采用了如下措施：采用加大叶轮出口宽度，减小叶轮外径D2增β2来提高效率；采用将叶轮进口边前移来减少汽蚀；同时将平衡孔位置移至叶轮叶片进水边境，且加大密封环直径的方法来平衡单级单吸离心泵轴向力；轴封采用机械密封，并且采用冷却系统，保证了降低密封腔介质温度及防止静环的强烈摩擦。 采用本文所设计方法后，离心泵的工作性能有了很大， 关键词：； 泵效； 平衡孔； 机械密封； 汽蚀The Desigin Of The Single Stage Oil Pump AbstractThe oil pump is an equipment that be used to transport the oil from one place to other.It is many used in oil field and oil refiner. The oil pumps can be divided into many types,For single-stage single-suction centrifugal pump four problems exist: 1,Improve the efficiency of the pump; 2,Elimination of H-Q curve hump problems; 3,Large flow、overload; 4,Improve the NPSH. For the problem of centrifugal pump,we specific use of the following measures in this paper:Increase the impeller outlet widthb2,reduced impeller diameterD2,increasing the impeller outlet angle β2 to improve efficiency;Reduce cavitation by forward edge of the impeller inlet;At the same time, balanced single-stage single-suction centrifugal axial force by impeller balance hole location to the border water and increase the diameter of seal ringp;seal using the mechanical shaft seal,and using cooling system,Sealed chamber to ensure that the medium temperature to reduce and to prevent the stati cring’s strong friction. Designed in this paper is, after four methods, centrifugal pump performance has greatly improved,it also can improve its stability and efficiency. Key words: pump; pump efficiency; balance hole; mechanical seal; cavitation 显示对应的拉丁字符的拼音 ? 字典 形容词 contemporary 副词 simultaneously at the same time 前 言 1 1 泵结构方案的选择 2 1.1泵吸入口和排出口的确定 2 1.2泵结构形式的确定 2 1.2.1确定比转数ns: 2 1.2.2原动机的选择： 3 1.2.3确定泵的结构形式 3 1.3最小轴颈的初步计算 3 2 泵叶轮的设计 5 2.1速度系数设计法 5 2.1.1 速度系数设计法的计算步骤 5 2.2 叶轮绘型 9 3 压出室及吸入室的设计 12 3.1 吸水室的结构设计 12 3.2 压出室的结构设计 13 3.2.1 压水室的作用和要求 13 3.2.2 任意断面的螺旋压水室的设计 13 4离心泵径向力、轴向力的平衡及平衡装置的设计 19 4.1 离心泵径向力的平衡及平衡装置的设计计算 19 4.1.1 径向力的