Axial fan, particularly for motor vehicles

Details Axial fan, particularly for motor vehicles Axial fan, particularly for motor vehicles

1999-03-30

2001-05-29

Look, Edward K. (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Rotor having flow confining or deflecting web, shroud or...

Axially extending shroud ring or casing

C416S22300B, C416SDIG002, C416SDIG005

Reexamination Certificate

active

06238184

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to an axial fan, particularly for motor vehicles.
More specifically, the subject of the invention is an axial fan of the type comprising:
a central hub, and
a plurality of blades extending radially from the hub and each having:
a root portion adjacent the hub,
a radially intermediate portion, and
a radially outermost, tip portion, the leading edge of the blade in the tip portion being inclined forwardly in the direction of rotation of the fan.
Axial fans of this type are known, for example, from U.S. Pat. No. 4,684,324 and from European patent EP-A-0 192 653.
In the axial fans described in these documents, the leading edge of each blade is inclined rearwardly relative to the direction of rotation of the fan in the root portion of the blade adjacent the hub, and is inclined forwardly in the direction of rotation of the fan in the remaining, radially outer portion of the blade.
In these fans, it has been found that air turbulence arises in the region of the intersection of the blades with the hub and this turbulence adversely affects the performance of the fan.
SUMMARY OF THE INVENTION
The object of the present invention is to provide an axial fan of the above-mentioned type which has improved performance and in which the flow-dynamic recirculation in the region of the intersection of the blade with the hub is optimized.
This and other objects are achieved, according to the invention, by an axial fan the main characteristics of which are defined in appended claims.


REFERENCES:
patent: 4684324 (1987-08-01), Perosino
patent: 5624234 (1997-04-01), Neely et al.
patent: 5906179 (1999-05-01), Capdevila
patent: 43 26 147 (1994-11-01), None
patent: 0 192 653 B1 (1993-04-01), None
patent: WO 91 07593 (1991-05-01), None

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