Pumps – Motor driven – Electric or magnetic motor
Reexamination Certificate
2001-01-10
2002-10-01
Walberg, Teresa (Department: 3742)
Pumps
Motor driven
Electric or magnetic motor
C165S122000
Reexamination Certificate
active
06457955
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a composite heat dissipation fan, and more particularly to a composite heat dissipation fan which can produce a multi-directional ventilating effect, thereby enhancing the heat dissipation efficiency.
2. Description of the Related Prior Art
A first conventional heat dissipation fan in accordance with the prior art shown in
FIG. 1
comprises a base
90
combined with a top plate
91
which defines a wind inlet opening
92
, the base
90
having a side wall defining a wind outlet opening
93
. The base
90
is combined on a heat emitting member of a central processing unit. When the fan device
94
is rotated, the ambient cold air is drawn into the wind inlet opening
92
on the top of the base
90
, so that the attached heat on the bottom of the base
90
combined on a heat emitting body (not shown) is carried by the drawn cold air, and is drained through the wind outlet opening
93
in the side wall of the base
90
, thereby dissipating the heat. In practice, the first conventional heat dissipation fan only has a single-side sideward wind draining function, so that only one path is used to carry away the heat produced by the heat emitting body, and cannot have a multi-directional ventilating path including the downward direction and the sideward direction, thereby greatly limiting th e cooling and heat dissipation efficiency.
A second conventional heat dissipation fan in accordance with the prior art shown in
FIG. 2
comprises a housing
80
combined with a stator seat
81
which is rotatably provided with an impeller
82
, the housing
80
covered by a cover plate
83
which has a wind inlet opening
84
for drawing the cold air, the housing
80
having a wind outlet opening
85
and heat dissipation fins
86
having heat dissipation channels.
The impeller
82
includes upper blades
821
, and lower blades
822
. Therefore, when the impeller
82
is rotated, it can drive the air flow along the axial direction and along the perpendicular face of the axial center, thereby obtaining a better heat convection and dissipation effect. However, the hub of the impeller
82
has a greater diameter and area, therefore, the lengths of the upper blade
821
and lower blades
822
are limited, thereby limiting the air flow driving effect thereof.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a composite heat dissipation fan which produces a multi-directional ventilating effect and drives a greater air flow, thereby enhancing heat dissipation effect and efficiency.
The present invention provides a composite heat dissipation fan which includes an impeller having first blades, and the first blades having a periphery combined with second blades for creating a side directed wind supply. The impeller is provided with a magnet ring which is energized with the stator coils of the base plate, so that the impeller is induced to rotate about the rotation shaft of the base plate. The first blades draw the ambient cold air through the wind inlet opening, and the wind outlet opening of the base plate drains the wind outward. The second blades uses part of the cold air to drain wind sideward, thereby providing a multi-directional wind draining effect so as to increase the heat dissipation efficiency.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.
REFERENCES:
patent: 4589822 (1986-05-01), Clausen et al.
patent: 4773829 (1988-09-01), Vettori
patent: 5478221 (1995-12-01), Loya
patent: 5967764 (1999-10-01), Booth et al.
patent: 6125924 (2000-10-01), Lin
patent: 6193478 (2001-02-01), Lin et al.
patent: 6309190 (2001-10-01), Chen
patent: 6318976 (2001-11-01), Hsiesh
patent: 6327145 (2001-12-01), Lian et al.
patent: 6406274 (2002-06-01), Lin et al.
patent: 2000320496 (2000-11-01), None
Fastovsky Leonid
Larson & Taylor PLC
Walberg Teresa
Yen Sun Technology Corp.
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