| 摘要 |
<p>A multi-blade fan having a convoluted casing provided with a suction opening and a discharge opening, an electric motor placed inside the casing, a main plate vertical to the rotating shaft of the electric motor and having an airflow hole, a first blade provided on the suction opening side of the main plate, and a second blade provided on the opposite side of the suction opening of the suction opening. The diameter of the main plate is smaller than the outer diameters of the first blade and the second blade, greater than the inner diameters of the blades, and the exit angle of either or both of the first blade and the second blade sequentially varies in the axial direction.</p> |
