FAN, METALLIC MOLD, AND FLUID DELIVERY DEVICE

摘要

Provided is a centrifugal fan equipped with fan blades (21) arranged in the circumferential direction at intervals therebetween. Each of the fan blades (21) has an inner edge section (26) which is disposed on the inner peripheral side of the fan blade, and also has an outer edge section (27) which is disposed on the outer peripheral side of the fan blade. The fan blade (21) has formed thereon a blade surface comprising a positive pressure surface and a negative pressure surface. When cut by a plane perpendicular to the rotation axis of the fan, the fan blade (21) has a cross-sectional shape having recesses formed in the positive pressure surface and the negative pressure surface. The fan blades (21) include fan blades (21A-21E) having different cross-sectional shapes. As a result of the configuration, the fan has excellent air blowing ability and generates less noise. Also provided are a metallic mold which is used to manufacture the fan and a fluid delivery device which is provided with the fan.