| 摘要 |
PROBLEM TO BE SOLVED: To prevent a main plate of a turbo fan from making contact with a frame plate. SOLUTION: A turbo fan 2 is arranged so that its shaft becomes horizontal, and a truncated conical hub 2d curved forward is provided on a central part of a main plate 2c making a back surface of the turbo fan 2. A fan motor 4 is arranged in a dent on the back surface side of this hub 2d, an output shaft 17 of this fan motor 4 is installed on the hub 2d through a vibration proofing member 18, and a main body 4a of the fan motor 4 is installed on a frame plate 1 on its back. A first magnet 31 is provided on a back surface of the main plate 2c of the turbo fan 2 and at a position on a circumference around the hub 2d. Simultaneously, a second magnet 32 repelling in the longitudinal direction by magnetic force against the first magnet 31 is provided at a position in front of the frame plate 1 and on a circumference facing against the first magnet 31. |
