Steel impeller axial-flow fan for nuclear power plant

The utility model provides a steel impeller axial-flow fan for a nuclear power plant, which aims to solve the problems that the conventional axial-flow fan of the existing ventilating equipment with the same specifications has lower relative pressure and is not suitable for the sites in the ventilation system of the nuclear power plant with limitation on zinc-aluminum material use as the impeller is frequently made of cast aluminum. The steel impeller axial-flow fan comprises a housing internally provided with a motor and a steel impeller, and is characterized in that the steel impeller consists of a hub group and a plurality of blades; the hub group includes a hub and a bearing ring which are connected onto the output shaft of the motor; a bolt is formed at the inner end of each blade; the bolt penetrates the bearing ring to be sequentially sleeved with a cushion block and a double nut; the cushion block is in key joint with the bolt; and the cushion block is fixed on the bearing ring through a taper pin. Th