| 摘要 |
Provided are a centrifugal fan where airflow speed distribution at a fan blowout opening, in the direction of the height of a blade, is uniformized to reduce operation noise, and an air conditioner in which the centrifugal fan is used to reduce operation noise. The centrifugal fan has a hub for fixing the rotating shaft of a motor, a main plate formed at the outer circumference of the hub, a shroud placed facing the main plate to form an airflow path, blades placed between the main plate and the shroud, and a bell mouth placed on the suction side of the shroud. Ridges or recesses are formed in that surface of the shroud which faces the bell mouth, and the ridges or recesses form, in fan operation, an airflow along the surface from the center of the shroud toward its outer circumference. The air conditioner has the centrifugal fan constructed as above.
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