Fluid reaction surfaces (i.e. – impellers) – Cupped reaction surface normal to rotation plane – Torque converters
Reexamination Certificate
2002-12-24
2004-12-07
Look, Edward K. (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
Cupped reaction surface normal to rotation plane
Torque converters
C416S243000
Reexamination Certificate
active
06827555
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a cooling fan, more particularly to a cooling fan with curved V-shaped impellers.
2. Description of the Related Art
FIG. 1
illustrates a conventional centrifugal cooling fan
50
for a notebook computer (not shown) The centrifugal cooling fan
50
includes a casing
51
and a plurality of impellers
501
extending outwardly and curvedly from a hub
502
which is mounted rotatably in the casing
51
. The root of each of the impellers
501
extends in an axial direction relative to the hub
502
. Since the centrifugal cooling fan
50
is used for a notebook computer and is thus relatively small, the impellers
501
are relatively short. As a consequence, air flow in the region swept by the rotating impellers
501
is relatively small. Moreover, the centrifugal cooling fan
50
tends to generate a relatively large amount of eddy currents in the casing
51
, which significantly reduces the air density of the air flow delivered by the fan
50
.
FIG. 2
illustrates a conventional axial cooling fan
60
that includes a casing
61
and a plurality of impellers
601
extending outwardly and curvedly from a hub
602
which is mounted rotatably in the casing
61
. Each of the impellers
601
is inclined relative to the axis of the hub
602
. Since the casing
61
has a depth that is relatively short, the air flow introduced by the impellers
601
will impact the casing
61
and will bounce back and forth in the casing
61
, thereby significantly reducing the cooling efficiency of the fan
60
.
U.S. Pat. No. 6,318,964 discloses an axial cooling fan that includes a hub having interconnected first and second hub halves, and a plurality of first and second impeller halves. Each first impeller half extends outwardly from the first hub half. Each second impeller half extends outwardly from the second hub half, and is connected to a respective one of the first impeller half in such a manner that both the first and second impeller halves are inclined relative to the axis of the hub in the same direction. The cooling fan thus disclosed has the same disadvantage as the conventional axial cooling fan.
SUMMARY OF THE INVENTION
Therefore, the object of the present invention is to provide a cooling fan with a plurality of V-shaped impellers that are capable of overcoming the aforementioned drawbacks of the prior art.
According to the present invention, there is provided a cooling fan that comprises: a rotatable hub; and a plurality of generally V-shaped impellers that are angularly displaced from each other and that extend outwardly from the hub. Each of the impellers has first and second impeller halves that extend outwardly from the hub and that are connected to each other so as to form cooperatively an angle therebetween.
REFERENCES:
patent: 537582 (1895-04-01), Poole
patent: 4484860 (1984-11-01), Brenholt et al.
patent: 6318964 (2001-11-01), Yang
patent: 6572336 (2003-06-01), Horng et al.
patent: 6699013 (2004-03-01), Zweighaft et al.
Edgar Richard A
Kamrath Alan D.
Look Edward K.
Nikolai & Mersereau , P.A.
Yang Sheng-Shyan
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