Centrifugal fan with volute

The invention relates to a centrifugal fan with a volute. The centrifugal fan comprises the volute, a volute type line comprises a first spiral line CD1, a second spiral line E1M and a Bezier curve D1E1, the Bezier curve D1E1 is disposed between the first spiral line CD1 and the second spiral line E1M, the first spiral line CD1 is an equiangular spiral line with a constant expansion angle, the second spiral line E1M is a variable-angle spiral line tapering at the expansion angle, and a point D1 and a point E1 of the curve D1E1 are respectively located on the upper side and the lower side of ahorizontal line OH1 passing through a volute center O, the point H1 is a control point used for controlling the bending direction of the curve D1E1, and the control point H1 is located on the curve D1E1. On the one hand, the left and right sizes of the volute are reduced, the smoothness of airflow collection and passing inside the volute is improved, the static pressure of the maximum static pressure and the effective air volume section is improved, the large volute effect is achieved at a small size, and pneumatic noise is reduced; and on the other hand, the Bezier curve is adopted for transition, so that the type line connection is smoother, the separation loss caused by the curvature mutation is reduced, and the aerodynamic noise caused by vortex is reduced.