The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 28, 2000
Filed:
May. 04, 1998
Yehia M Amr, Manlius, NY (US);
Carrier Corporation, Farmington, CT (US);
Abstract
A centrifugal fan including a fan hub lying generally in a plane normal to the axis of fan rotation and having a central opening for receiving a motor housing, and a plurality of fan blades of substantially identical construction spaced circumferentially evenly around the fan hub and extending away from the fan hub in a direction parallel to the axis of fan rotation. Each fan blade includes a leading edge at its innermost radial periphery, and the leading edge, at least at the axially upper one-half section thereof, is convexly curved in the shape of a quarter ellipse having a major axis, Mg, substantially parallel to the axis of fan rotation and a minor axis, mh, normal to the major axis Mg. The fan also includes a continuous shroud joined to each fan blade at an axially upper section of the radially outer portion thereof and the shroud is concave in cross-section. The fan orifice used in conjunction with the fan has an entry portion that is convex in cross-section and is in the form of a surface produced by rotating a planar line about a coplanar axis of generation that is coincident with the axis of rotation of the fan, the planar line being a generally quarter segment of an ellipse having a major axis, Ma, substantially parallel to the axis of generation and a minor axis, mb, normal to the major axis Ma.