| 摘要 |
A turbo fan is provided to smooth air flow by forming a blade having a curvature getting smaller from a maximum boundary point to the outside of the boundary on the blade. A turbo fan includes a body, a main plate(50), blades(60), and shroud. The body includes an air inlet, an air passage, and an air outlet. The air enters the air inlet, passes through the air passage, and leaves the air outlet. The main plate is circular in shape to form the lower part of the body, and is installed with a fan motor. The blades are radially arranged between the main plate and the shroud, has a section of an aerofoil shape, and includes a suction surface on one side and a pressure surface(61) on the other side. The shroud prevents air re-suction inside the body. A boundary(70) between the main plate and the pressure surface consists of an ascending portion(71) inclined to the pressure surface toward the outside of the blade and a descending portion(72) inclined to the main plate toward the outside of the blade.
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