| 摘要 |
PROBLEM TO BE SOLVED: To meet the need of noise reduction, although generated noise of an impeller has reached the limits in a multiblade fan. SOLUTION: When a centrifugal fan 5 is rotated, a back face of a blade A6 of the centrifugal fan 5 is peeled at the middle thereof, a peeling vortex gets larger toward an outer periphery, and it becomes to the maximum at a blade discharge port, so that turbulence sound gets larger. Since the blade A6 is made of microfiber material, the noise is absorbed therein. Therefore, a centrifugal impeller of the invention absorbs noise caused by the turbulent vortex in the blade A6 and has dust collection effect. COPYRIGHT: (C)2006,JPO&NCIPI
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