Axial-flow fan

Details Axial-flow fan Axial-flow fan

2006-10-17

2006-10-17

Edgar, Richard A. (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Reverse curve surface

C416SDIG004

Reexamination Certificate

active

07121807

ABSTRACT:
Disclosed is an axial-flow fan having a central hub coupled to a rotational shaft of a motor, a plurality of blades extending radially outwardly from the outer circumference of the hub for blowing air in an axial direction, the plurality of blades being integrated with the hub into a single body, and a circular fan band fixedly coupled to the peripheral ends of the plurality of blades for surrounding the plurality of blades, each of the plurality of blades having a leading edge line (L.E.L.) and a trailing edge line (T.E.L.) that are formed in a corrugated shape along almost the same direction to each other and have at least two or more pairs of inflection points formed along the lines, wherein the inflection points of the trailing edge line (T.E.L.) formed on each of the plurality of blades are placed in such a manner as to be closer to a blade tip than those of the leading edge line (L.E.L.) formed on each of the plurality of blades.

REFERENCES:
patent: 4684324 (1987-08-01), Perosino
patent: 4737077 (1988-04-01), Vera
patent: 5961289 (1999-10-01), Lohmann
patent: 6908287 (2005-06-01), Cho et al.
patent: 2000-0047976 (2000-07-01), None

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