| 摘要 |
PROBLEM TO BE SOLVED: To increase a wind quantity while suppressing generation of blade noise by differing curvatures of maximum outer diameter parts of both side blades serving the maximum outer diameter part as a boundary, in a device provided with a fan wherein a plurality of blades are attached in the outer peripheral direction of disk plates, and the maximum outer diameter part is disposed on each blade. SOLUTION: When an impeller 2 as a percolation fan composed of blades 1 and disk plates 9 is rotated, air sucked from a grill 11 arranged on a front suction port 17 of a decorative frame 8 and an upper grill 3 through a filter 12 is passed a nose 10 and the impeller 2, and then, the air is blown out from a blowout port on which vertical and horizontal wind direction plates 13, 5 are disposed. In this case, in the blades 1, those outer shapes are changed between disk plates 9, and are set maximum between the disk plates 9. In association with rotation of the impeller 2, air is firstly passed near the nose 10 from the maximum outer diameter part of the blades 1, and passing phase of the blades 1 crossing rear flow in the nose 10 or a thermal exchanger 4 is changed. It is thus possible to increase a wind quantity while reducing blade noise.
|
