er and wheel disc are all made of 16Mn steel. The whole impeller runs smoothly through dynamic and static balance correction.2. The chassis. The cochlear shell is welded by ordinary steel plate. The installation and disassembly of the impeller shall be carried out by one side of the housing.3. The air inlet is made into a collecting streamline integral structure. Install it on the side of the fan.4. The transmission part consists of the spindle, bearing box, rolling bearing and belt wheel. The