Patent ID: 6338610
Filing Date: 2002-01-15
Classification: F04D

Abstract:
An impeller having a plurality of blades between an inlet at a central portion and an exit at a peripheral portion, and a flow passage formed between said blades for delivering fluid from said inlet to said exit by rotation of said impeller, characterized in that:said blade is leaned toward a circumferential direction so that the blade at the hub side precedes the blade at the shroud side in a rotational direction of said impeller; a blade lean angle, defined as an angle between said blade and a surface perpendicular to a hub surface as viewed from the direction of said exit of said flow passage, shows a decreasing tendency from said inlet to said exit; and a blade centerline at the hub side and a blade centerline at the shroud side as viewed from the front direction at said inlet intersect at a point where non-dimensional radius location, defined as a ratio of the radius of said intersection to the radius of said exit, ranges from 0.8 to 0.95.