| 摘要 |
<p>A centrifugal fan (2) includes a scroll casing (10) having first and second flat base walls (101,102),and a circumferential side wall (103). An air inlet (11) is formed on a center portion of the first base wall (101) and an exhaust port (12) is formed on the circumferential side wall (103). An airflow correction mechanism (40) that forms smooth airflow when an impeller (20) rotates is provided. The mechanism (40) has an annular rib (41) that is formed on the inside surface of the first base wall (101) so as to be jutted to the side of the second base wall (102) and to be concentric with the rotating shaft (31), and a recess portion (42) that is formed on every blade of the impeller (20) so that the annular rib (21) is inserted therein with a predetermined gap. The annular rib (41) and the recess portion (42) are configured to change the direction of airflow directed to the air inlet (11) back to a space between the blades (21).</p> |
