Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Irregular – flanged or channel forming blade surface
Reexamination Certificate
2005-09-06
2005-09-06
Trieu, Theresa (Department: 3748)
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Irregular, flanged or channel forming blade surface
C416S21000A, C416S235000, C416S23600R
Reexamination Certificate
active
06939108
ABSTRACT:
A circulatory device comprising a large diameter fan having reinforced fan blades with a tapered airfoil shape is disclosed. The fan blades may be formed using an extrusion method of fabrication, wherein each fan blade may comprise a reinforced trailing edge with a downwardly extending flange. The benefit of forming each fan blade with a reinforced trailing edge of the present invention results in improved structural characteristics such that the trailing edge of each fan blade may be fabricated longer so as to improve aerodynamic performance. Also, the reinforced trailing edge resists tearing that may occur during extrusion by adding the bent flanged region to at least one distal end of the trailing edge. For example, the bent portion of the trailing edge tends to rigidly orient the extruded material in a stabilized position more readily during formation. Also, the bent portion provides added strength by providing supporting forces in two dimensions that relatively parallel and perpendicular to its length so as to neutralize the adverse effects of pressure forces acting on the trailing edge of the fan blade during extrusion.
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Janus, J.M., “Analysis of Industrial Fan Designs with Gurney Flaps”, 38thAerospace Sciences Meeting & Exhibit, Jan. 10-13, 2000/Reno, Nevada AIAA-2000-0983, pp. 1-9.
Delta T Corporation
Lathrop & Gage LC
Mechanization Systems Company, Inc.
Trieu Theresa
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