Sump pump is a single-stage, single suction cantilever structure pump , the liquid discharged from the outlet pipe parts, semi open impeller, can be transported with high concentration of solid particles of the medium. It is mainly used for environmental protection, new building materials, coal, municipal engineering, thermal power generation, coal coking plants, oil refineries, steel mills, mining, paper, cement factory, food factory, printing and dyeing, concrete sludge gas, heavy oil, diesel occupation suction pus, turbid liquid, slurry, mortar, flow the sewage channel sand and the city, and the powerful pump liquid containing coal and coal ash. It can also be used as a chemical, medicine and other professions to draw a fluid containing mud sand residue and a corrosive liquid.