| 摘要 |
PROBLEM TO BE SOLVED: To reduce noise in a fan device used for a ventilation air-conditioning device or the like.SOLUTION: A fan device 1 includes a casing 2 comprising a plurality of surfaces, a turbo fan 3 in the casing 2 and an electric motor 4 for driving the turbo fan. The casing 2 includes an inflow surface 6 having an inflow port 5 through which air is flowed in the casing 2 and an opening 7 on a surface adjoining the inflow surface 6. The turbo fan 3 rotated at the center of a rotary shaft 8 of an electric motor 4 comprises a main plate 9 fixed to the rotary shaft 8, a side plate 11 having an suction port 10 and a plurality of blades 12 provided between the main plate 9 and the side plate 11 and fixed to the rotary shaft 8. The fan device 1 includes an annular wall 14 whose cross section is vertical to the rotary shaft 8 and is a circle at the center of the rotary shaft 8 outward a discharge port 13. |
