| 摘要 |
PURPOSE: A turbo fan is provided to increase an amount of wind to be generated and to reduce noise by designing inner and outer diameters of a shroud of the turbo fan such that the shroud has an optimal diameter ratio. CONSTITUTION: A turbo fan(50) includes a hub(51) installed at a rotating shaft of a motor, a plurality of blades(53) installed at an outer peripheral portion of the hub(51), and a shroud(54) installed at an end of an air intake section of the blades(53). A center of the hub(51) is protruded toward the air intake section and a rim section of the hub(51) is vertically formed with respect to the rotating shaft so that air is easily exhausted to an exterior. A plurality of cooling holes are formed at a center portion of the hub(51) so that a part of air cools the motor by passing through the cooling holes.
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