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1 前言 在农村人畜饮水工程和小型农田灌溉工程中,引水水源型式多为大口井或河渠等浅水源工程,取水设备多采用单级或多级离心水泵。目前在较大型的抽水站中,离心泵多采用真空泵(或喷射泵)抽取真空;而在不少小型抽水站中,仍采用底阀加人工灌引水的方法开机。农村小型水泵站,多是以自然村或户为单位购买的取水设备。如增设真空泵或喷射泵,不但投资大,且辅助管路闸阀和电气控制设备多,操作维护复杂。人工灌引水,往往需数人方可操作,不便于小型人畜饮水工程
1 Introduction In rural areas, livestock and poultry drinking water projects and small farmland irrigation projects, the diversion of water sources are mostly large wells or canals and other shallow water projects, water equipment to use more single-stage or multi-stage centrifugal pump. Currently in larger pumping stations, centrifugal pumps use more vacuum pumps (or jet pumps) to extract the vacuum; and in many small pumping stations, the method of using base valves and artificial irrigation is still switched on. Small rural water pump stations, mostly in villages or households as units to buy water equipment. Such as additional vacuum pump or jet pump, not only investment, and auxiliary pipeline valve and electrical control equipment, operation and maintenance complex. Artificial irrigation water, often required only a few people to operate, inconvenience to small people and livestock drinking water project