Centrifugal fan

A centrifugal fan in which a rotation shaft is attached to a mounting section to rotate in a predetermined direction so that air taken in from a front of a support section is blown out radially, the centrifugal fan comprising:

• the support section having a circular shape viewed from the front;
• a plurality of blades arranged in an annular shape along an outer circumference of the support section;
• and
• the mounting section provided at a center of the support section,
• wherein each of the blades includes:
• a primary wing section that has a trailing edge which is parallel to a central axis of rotation of the rotation shaft, a leading edge end section which is parallel to the central axis of rotation, and a thickness gradually growing thinner toward the trailing edge and the leading edge end section;
• and
• an auxiliary wing section that extends from the leading edge end section of the primary wing section toward the interior of the centrifugal fan, and
• wherein the auxiliary wing section has a length from the leading edge end section of the primary wing section to a leading edge of the auxiliary wing section that is greater at a side of the support section than at an intake side when viewed in a direction of the central axis of rotation, and
• wherein the auxiliary wing section has a constant thickness across the entire area of the auxiliary wing section.