| 摘要 |
PROBLEM TO BE SOLVED: To provide a blower fan capable of preventing damage to a core by interference to the core of a heat exchanger while enhancing the rigidity of the fan and suppressing the weight increase of blades. SOLUTION: A ring 53 for circumferentially connecting outer peripheral ends 521 of a plurality of blades 52 to one another is formed in a double cylindrical structure formed of two cylinders 531, 533. The cylinders 531, 533 are connected by an expansion part 532 and a connection rib 534, thereby enhancing the rigidity of the rib 53. COPYRIGHT: (C)2009,JPO&INPIT
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