Volute, centrifugal fan and range hood

The invention relates to a volute, a centrifugal fan and a range hood. The volute comprises an annular wall used for defining volute molded lines, the annular wall is provided with a starting end located on the upstream and a tail end located on the downstream on a flowing path of airflow, the position, close to the tail end, of the annular wall is provided with a bent part formed by connecting a plurality of broken line sections, and when the annular wall defines a first volute molded line, the bent part is provided with a second bent part formed by connecting a plurality of broken line sections. The bending part extends in a wave shape, a fold line inclination angle is formed between the fold line section and a connecting line of adjacent wave troughs in the bending part, and the fold line inclination angle is not larger than 15 degrees. According to the scheme, the air volume of the volute can be increased, and the airflow performance of the volute under the determined molded line is optimized. The inventi