Flow guide device for air inlet of centrifugal fan

A flow guide device for an air inlet of a centrifugal fan relates to the technical field of centrifugal fans, the centrifugal fan comprises a volute group, the volute group comprises a volute body and an air outlet arranged at an opening of the volute body, a first through hole is formed in one side wall of the volute body, and a second through hole is formed in the other side wall of the volute body. The flow guiding device comprises an air inlet mechanism arranged on one side of the volute body, the air inlet mechanism comprises an air inlet box parallel to the volute body, an air inlet is formed in the top of the air inlet box, a second through hole is formed in the side wall, close to the volute body, of the air inlet box, and a connecting piece is arranged on the side wall of the air inlet box. The connecting pieces are evenly distributed on the outer side of the second through hole in the circumferential direction of the second through hole and used for connecting the volute body and the air inlet box,