Patent ID: 7481619
Filing Date: 2009-01-27
Classification: F04D,F24F

Abstract:
1. A fan ring for use with a heat exchanger comprising: an annular fan ring body attached to a coaxial mounting ring, the fan ring body and mounting ring having a center axis; the fan ring body extending in a substantially perpendicular direction from an inner periphery of the mounting ring; the fan ring body having a circumferential periphery profile defined by a plane coincident the center axis; the periphery profile at an inner surface of the fan ring body includes: the transition portion extending in a substantially perpendicular direction from the mounting ring and attaching to an end of the curved portion; wherein the length of the curved portion of the periphery profile is sufficient to reduce recirculation of air entering the fan ring body; wherein a ratio of a length of the transition portion along the periphery profile to a length of the curved portion along the periphery profile is greater than about 1:1 and a fan arranged and disposed such that a fan blade centerline intersects the curved portion at a point near a minimum diameter of the inner surface of the fan ring body.