High-performance axial-flow fan for extractor hood

The invention provides a high-performance axial flow fan for range hoods, which includes a casing and a centrifugal wind wheel installed in the casing and driven by a motor. The centrifugal wind wheel is at least composed of radially distributed arc-shaped blades, adjacent An air duct is formed between the arc-shaped blades, and the air duct is inclined toward the air outlet of the fan along the direction from inside to outside. The inclined air duct design makes the high-pressure wind generated by the centrifugal fan rebound to the exhaust outlet of the fan after hitting the inner wall of the casing, and will not enter the centrifugal fan again. The turbulence between the inner walls of the casing improves the overall fluid dynamic efficiency of the fan, thereby reducing the movement wind resistance of the centrifugal fan, enabling the centrifugal fan to rotate at high speed and generate high-pressure air above 600Pa, so that the grease in the oil fume can condense into small oil Drops, improving the separation of oil and fat.