QJX series downdraught submersible electric pump is the new water lifting machinery researched and developed by Ganquan Group Co., which can be widely applied to water lifting from the river and lake; water supply and drainage of mine; new construction or reconstruction of city running water system and various kinds of district secondary water supply systems. The pump adopts the integration design, and has good integral structure, easy installation and maintenance, reliable operation, high mechanical efficiency, and obvious energy-saving effect and low operation cost. The flow rate range of QJX series downdraught submersible electric pump is 80-600m3/h, and its pump part can be separated into many stages; the head range is 20-180m and selected range of the basic parameters is rather wide which can fully meet the customer’s operating requirement. The motor adopts the dynamic water jacket refrigerating structure which has good heat emission performance and can extend the life service. The pump station and fixed lifting appliances are not needed, which greatly decrease the investment fee of the civil work and corresponding equipments during the water supply construction or reconstruction system. The pump operates under the water, and there is no noises and water and oil leakage troubles, which will not cause any pollution to the environment while is easy to be hided and adjust the sights very harmoniously.