Energy saving ventilation fan for mining use

The utility model relates to a large ventilation fan arranged on the ground surface of the mine. The machine adopts a disrotatory type fan towed by a single motor on the structure and provides a novel main ventilation fan which has the advantages of low power consumption, high efficiency and convenient transmission system and is suitable for the old fan in China to carry out the improvement. The maximum efficiency of the machine can reach 84%, and the high efficiency region is wider. When the fan is under the rated air flow rate, the adjustment range of the static pressure is from 1050Pa to 5250Pa, and the lowest efficiency of the static pressure can reach 78%. The adjusted working range of the machine completely meets the demands of different wind pressure change of every production period of the mine in China, and the utility model really is the energy saving fan.