| 摘要 |
PROBLEM TO BE SOLVED: To provide a fan improving static pressure characteristics without causing degradation of air volume characteristics, since in a suction fan, not only miniaturization but also high static pressure and high air volume are required; however, when improving the static pressure characteristics, the air volume characteristics are degraded and when improving the air volume characteristics, the static pressure characteristics are degraded, that is, the static pressure characteristics and air volume characteristics are in a trade-off relationship. SOLUTION: The outer peripheral surface of the rotor hub 40 of the centrifugal fan 1 has an inclined surface 1021 inclined axially downward toward a radially outward direction, the radially inner end of a connection between a blade 103 and the rotor hub 40 is positioned on the inclined surface 1021, and an inclined edge inclined axially downward toward a radially inward direction is formed between the radially inner edge of the blade 103 and the axially upper edge thereof. Therefore, the high air volume and high static pressure are improved while achieving the miniaturization. COPYRIGHT: (C)2012,JPO&INPIT |
