A curved portion is formed at a corner portion between a shroud and a positive pressure surface of each of a plurality of blades. The curved portion has a curvature that decreases from a suction port or the vicinity of the suction port toward a corresponding one of discharge ports. The curved portion includes a curved surface that is concave in a direction of rotation of the fan and forms a part of the positive pressure surface. The curved portion raised inwardly into an airflow path so that a shortest distance between the outer peripheral portion of a hub and a portion of the curved surface in the vicinity of the shroud may gradually decrease toward the corresponding one of the discharge ports.
申请公布号
US8562297(B2)
申请公布日期
2013.10.22
申请号
US20100853836
申请日期
2010.08.10
申请人
YEN KEVIN;KURIBAYASHI HIROMITSU;SANYO DENKI CO., LTD.