| 摘要 |
A cooling device is provided which is easy to assemble and provides improved cooling efficiency by preventing a back flow without fail. To this end, the cooling device has: (a) an axial fan having a plurality of vanes; (b) a power source for driving the axial fan; (c) a tubular fan ring disposed in outer edge portions of the vanes; (d) a projecting portion that extends over substantially entire circumference of the fan ring and projects in an outer peripheral direction; (e) a shroud disposed between the axial fan and an object to be cooled; and (f) an adjusting plate that is fixedly attached to the shroud so as to make a distance from an outer circumferential surface of the fan ring variable and circumferentially divided into a plurality of parts. |
