Patent ID: 9726190
Date: 2017-08-08
CPC Classifications: F04D,F05D

Claim:
1. A propeller fan, comprising: a rotation shaft portion rotatable around a virtual central axis; and a blade extending from said rotation shaft portion outward in a direction of radius of said central axis, wherein said blade includes: said outer edge portion connects said blade tip end portion and said blade rear end portion to each other, said blade surface includes: said front end portion is located closer to said front edge portion, said blade tip end portion, or said outer edge portion than said rear edge portion, said rear end portion is located closer to said rear edge portion than said front edge portion, said blade surface is formed such that a stagger angle in a portion on the inner side in said direction of radius relative to said coupling portion in said blade surface is smaller than a stagger angle in a portion on the outer side in the direction of radius of said central axis relative to said coupling portion in said blade surface, and said front edge portion has a constant height in an axial direction of said central axis between said rotation shaft portion and a position distant from said rotation shaft portion outward in the direction of radius of said central axis.