Fan-shaped helical blade

The invention discloses a fan-shaped helical blade. The fan-shaped helical blade is in the helical ascending form. The helical angle is 20 to 45 DEG and the plane projection of the helical angle is fan-shaped and annular. An outer edge (3) and an inner edge (4) are respectively arranged at the two sides of the fan-shaped helical blade. A front edge (1) and a rear edge (2) are respectively arranged at the front and rear ends of the fan-shaped helical blade. The rear edge (2) adopts shape corner, the outer edge (3) and the front edge (1) adopt circular corner, and the inner edge (4) adopts right-angled side. The fan-shaped helical blade is simple in structure and has no special requirement for manufacturing materials, the surface of the fan-shaped helical blade is smooth, and the costs are reduced. The structure of the fan-shaped helical blade ensures the velocity distribution of the helical flow field, thereby effectively ensuring the quick separation and aggregation of gas in a helical flow gas concentration separator.