| 摘要 |
PURPOSE:To prevent turblence from occuring in a ventilating passage between an inside air introduction port and the suction port of a blower to restrain noise which is generated when a casing is excited, by providing a rectifying means in the ventilating passage, which divides the latter into a plurality of layers. CONSTITUTION:A air-blower device BL comprises an outside air introduction port 3 and an inside air introduction port 4 which are formed in an upper casing 1a that constitutes a casing 1 together with a lower casing 1b, and a centrifugal fan F which is driven by a motor M and which is disposed in the lower casing 1b, Further, an inside and outside air change-over damper 7 is rotatably journalled at the bifurcated position between the inside and outside air introduction ports 3, 4, In the above-mentioned arrangement, a rectifying plate 8 is rotatably journalled at the vertically central position of the inside air introduction port 4 and is extend in parallel with the above-mentioned damper 7. The damper 7 and the rectifying plate 8 are associatingly opened and closed by the drive force of an actuator 9 through an L-like hardware 14, an intermediate lever 15, a hardware 16, etc. |
