| 摘要 |
<p>The present invention provides a centrifugal fan assembly (10) including a housing (18) and a centrifugal fan (14). The centrifugal fan (14) includes main blades (90), each including a suction surface (118), a pressure surface (122), a leading edge (142), and a trailing edge (146). The centrifugal fan (14) also includes secondary blades (94), each including a suction surface (134) and a pressure surface (138). Each main blade (90) defines a mean line (150) between the suction surface and the pressure surface, and a nose-tail line (154) intersecting the main blade mean line (150) at the leading edge and the trailing edge. Each secondary blade (94) defines a mean line (158) between the suction surface and the pressure surface. A portion of the secondary blade mean line (158) is substantially parallel to the main blade mean line (150) when superimposed, and a portion of the superimposed secondary blade mean line deviates from the main blade mean line in a direction toward the main blade nose-tail line (154).
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