Patent ID: 9206815
Filing Date: 2015-12-08
Classification: B29C,B29L,F04D,F05D,Y02T

Abstract:
1. A fan comprising: a plurality of blade portions arranged spaced apart from each other in a circumferential direction, each blade portion of said plurality of blade portions having an inner edge portion disposed on an inner peripheral side thereof and an outer edge portion disposed on an outer peripheral side thereof, wherein said blade portion has a blade surface extending between said inner edge portion and said outer edge portion and including a pressure surface disposed on a rotational direction side of the fan and a suction surface disposed on a back side of said pressure surface, as the fan is rotated, a fluid flow is produced on said blade surface to flow between said inner edge portion and said outer edge portion, when cut along a plane orthogonal to a rotation axis of the fan, said blade portion has a blade cross section having concave portions formed at said pressure surface and said suction surface, a plurality of said blade portions include a first blade portion and a second blade portion having blade cross sections of different shapes, said first blade portion and said second blade portion are different from each other in number of said concave portions.