目前国内外一般排灌机械基本上可列为两大类型:热力水泵与电力水泵。利用电动机来驱动各种水泵,由于电源缺乏,尤其在我国广大农村,在全国电气化以前就很难全面的应用,于是不得不大量使用热力发动机。热力发动机包括蒸汽机、煤气机和柴油机,蒸汽机笨重、效率低、金属耗量大,无法大力推广;而煤气机、柴油机的一套活塞、曲柄、连杆机构又是属于高金属、高工艺性、高保养性的精密机械,使用成本很高,而且所有这些活塞式发动机又要通过一定的传动机构带动效率也不高的水泵来实现抽水。以煤气机驱动离心式抽水机而言,机组总 At present, domestic and foreign general irrigation and drainage machinery can be basically classified into two types: heat pumps and electric pumps. The use of motors to drive a variety of pumps, due to lack of power, especially in the vast rural areas in China before the electrification is difficult to comprehensive application, so had to use large amounts of heat engine. The heat engine includes a steam engine, a gas engine and a diesel engine. The steam engine is bulky, inefficient and has a large metal consumption. Therefore, a piston, a crank and a connecting rod mechanism of a gas engine and a diesel engine belong to a high metal, High maintenance of precision machinery, the use of high cost, but all of these piston engine but also through a certain transmission mechanism driven by the efficiency of the pump to achieve pumping. To gas-driven centrifugal pumps, the total unit