| 摘要 |
PURPOSE: A blade of a turbo fan is provided to reduce a frictional resistance between the air and surface of the blade by improving the structure of the turbo fan. CONSTITUTION: A turbo fan(10) comprises a hub(2) shaft coupled to a fan motor; a plurality of blades(30) arranged at a constant spacing along the inner surface of the hub; and a shroud(4) connected along the lower ends of the blades. Each of the blade has a groove(31) for forming a vortex to the certain part of the air flowing along the surface of the blade in such a manner that the residual air flows separately from the surface of the blade. The groove is formed in parallel with the axial direction.
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