| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an axial flow fan having efficiency improved without decreasing gas volume. <P>SOLUTION: Each blade of the fan has a trailing edge portion 2111 at the rearmost position in the rotation direction and a leading edge portion 2112 at the foremost position in the rotation direction. A curved line C1 interconnects the trailing edge portion 2111 and the leading edge portion 2112 at the shortest distance on an imaginary cylindrical surface. The blade includes a lower surface 2113 facing downward in the center axis direction and an upper surface 2114 facing upward in the center axis direction. A camber line CL1 is positioned equidistantly from both surfaces of the lower surface 2113 and the upper surface 2114. The ratio L1/L2 decreases from a radial inner side toward a radial outer side, wherein L1 denotes the longest distance from the curved line C1 to the camber line CL1, and L2 denotes the length of the curved line C1. <P>COPYRIGHT: (C)2013,JPO&INPIT |
