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US Patent 7815419 Impeller for blower and air conditioner having the same

Patent 7815419 was granted and assigned to Daikin Industries, Ltd. on October, 2010 by the United States Patent and Trademark Office.

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Patent abstract

An impeller is provided for a blower having a blade (15), a plurality of notches (17) provided at predetermined intervals on a side edge of the blade (15), and a plurality of smooth portions (18) each provided between a pair of the notches (17). Since a transverse vortex discharged from the side edge of the blade (15), and on a large scale, is organized by vertical vortexes formed in the notches (17) on a small scale so as to be segmented into stable transverse vortexes, it becomes possible to reduce aerodynamic noise.

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