| 摘要 |
PROBLEM TO BE SOLVED: To attain both of suppression in backflow of air blown out of a centrifugal fan to a suction port side, and suppression in increase of shaft power of the centrifugal fan.SOLUTION: A centrifugal blower includes a case 30 storing a centrifugal fan 20 in an internal space thereof and having a suction port 30a of air, and a fan side magnet 22b formed in an annular shape when viewed from an axial direction of a rotating shaft is fixed on an upper surface side plate 22 arranged on the suction port 30a side of the centrifugal fan 20. Further, a case side magnet 31c formed in an annular shape when viewed from the axial direction of the rotating shaft is fixed on a suction side surface 31a of the case 30 arranged to be opposed to the upper surface side plate 22. A magnetic fluid M is filled in a space annularly formed between the fan side magnet 22b and the case side magnet 31c to the whole periphery. |
