Fan assemblies and method of making same

Details Fan assemblies and method of making same Fan assemblies and method of making same

1991-12-23

1993-09-21

Denion, Thomas E.

Fluid reaction surfaces (i.e., impellers)

Specific working member mount

Distally supported on radial arm

416213A, 416DIG3, 416223R, 416DIG2, 416DIG5, B63H 120

Patent

active

052463435

ABSTRACT:
A low cost assembly and method for assembly of a fan having a hub, a spider with arms and blades attached to the arms is provided. The spider is arc welded to the hub and the blades are projection welded to the arms. The blades have a root, a tip, and an ear. The width or chord of the blade decreases from the root to the ear and then increases from the ear to the tip. The blade has an air foil shape defined by the arcs of two circles. The radii of the circles and, thus the profile of the blade, change as a function of the cord length and the camber of the blade. The blades have a pitch angle which decreases from the root to the ear. The spider arms are formed to match the pitch and are rotated slightly with respect to the horizontal. The result is a highly efficient, low cost fan blade assembly construction.

REFERENCES:
patent: 2974728 (1961-03-01), Culp
patent: 3951611 (1976-04-01), Morrill
patent: 4053260 (1977-10-01), Yee
patent: 4088423 (1978-05-01), Dulin et al.
patent: 4120257 (1978-10-01), Matucheski
Owczarski, W. A., "Getting The Most From Projection Welding", Machinery, vol. 69, No. 2, Oct. 1962, pp. 97-100.

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