The utility model discloses a double-air-outlet
centrifugal fan with an improved tongue opening structure, which belongs to the technical field of
centrifugal fan structure improvement and comprises an upper cover, fan blades and a base, a first air outlet and a second air outlet are arranged at the edge position between the upper cover and the base, and a second tongue opening is arranged between the first air outlet and the second air outlet. The second tongue opening comprises a front flow guide part, lateral flow guide parts are arranged on the two sides of the front flow guide part, a
tail connecting part is arranged between the rear portions of the two lateral flow guide parts, a reference section is arranged in the middle of the second tongue opening, the section of the second tongue opening
clockwise rotates around the circle center of an arc in the direction from the reference section to the base, and the rotation angle is gradually increased. The section of the second tongue opening rotates anticlockwise around the circle center of the arc in the direction from the reference section to the base, and the rotation angle is gradually increased. The air flow separation phenomenon at the position of the second tongue opening can be eliminated, the aerodynamic performance is greatly improved, meanwhile, the local high-low pressure gradient of the surface of the tongue opening can be reduced, and the
sound quality is improved.