Patent ID: 6206641
Filing Date: 2001-03-27
Classification: F04D,Y10S

Abstract:
A micro fan comprising:a hub rotatably mounted to a shaft, anda plurality of blades radially formed on a circumferential outer surface of the hub,wherein each blade has an airfoil-shaped cross-section which generates lift force larger than drag force; andwherein, when assuming that one end of the airfoil-shaped cross-section of each blade, which is rounded at a predetermined radius, is a leading edge, the other end of the airfoil-shaped cross-section of each blade is a trailing edge, a straight line which connects the leading edge and the trailing edge with each other is a chord line, a thickness center line between the leading edge and the trailing edge is a mean line, and an inclination angle of the chord line with respect to a parallel line which is drawn from the leading edge is a blade angle, a blade angle at a root of the blade which is adjacent to the hub is about 24.degree.-34.degree., a blade angle at a tip of the blade which is adjacent to a duct of the micro fan is about 18.degree.-28.degree., and a span twist angle which is represented by a difference between the blade angles at the root and the tip is 2.degree.-12.degree. of helical twist.