Blade and impeller for axial flow fan and axial flow fan

The utility model discloses a blade and an impeller for an axial flow fan and the axial flow fan, the blade comprises a body and a first mounting seat, the upper surface of the first mounting seat is provided with two joining blocks, and the two joining blocks are respectively connected with the two side surfaces of the body; the connecting block is provided with a first connecting edge and a second connecting edge, the first connecting edge is connected with the upper surface of the first mounting seat at a first position, and the second connecting edge is connected with the side surface of the body at a second position; the curvature of the upper surface of the first mounting seat at the first position is consistent with the curvature of the joining block at the first position, and the curvature of the side face of the body at the second position is consistent with the curvature of the joining block at the second position. According to the utility model, the connecting block is additionally arranged, so tha