Heat dissipating device

Details Heat dissipating device Heat dissipating device

2002-05-24

2003-07-29

Chérvinsky, Boris (Department: 2835)

Electricity: electrical systems and devices

Housing or mounting assemblies with diverse electrical...

For electronic systems and devices

C361S699000, C257S714000, C174S015100, C174S016100, C174S016300, C165S080300, C165S080400, C165S104330

Reexamination Certificate

active

06600649

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a heat dissipating device, more particularly to a heat dissipating device which can ensure circulation of a working fluid to thereby increase the efficiency of the heat dissipating device.
2. Description of the Related Art
Referring to
FIG. 1
, a conventional heat dissipating device
10
for use in computer systems is shown to include a cooling device
11
which is adapted to be mounted on a heat generating component, a heat dissipating fan
12
, and a heat dissipating fin
13
. The cooling device
11
contains a working fluid and has a delivery pipe
111
for delivering the working fluid to the fin
13
. The heat dissipating fan
12
has a top side formed with an air inlet
121
, and a lateral side formed with an air outlet
122
. The fin
13
is disposed adjacent to the air outlet
122
and is formed with a channel
131
for extension of the delivery pipe
111
. Therefore, when the working fluid in the cooling device
11
absorbs heat from the heat generating component, the working fluid is cooled by simply delivering the working fluid through the delivery pipe
11
which is connected to the heat dissipating fin
13
. At the same time, the heat dissipating fan
12
continuously blows air through the air outlet
122
to the heat dissipating fin
13
in order to assist in the cooling of the working fluid. However, the conventional heat dissipating device
10
has several drawbacks. First of all, since the cooling device
11
is not associated with any circulation device, the movement of the working fluid is very slow. As such, the temperature reduction of the working fluid is limited to where the delivery pipe
111
is in contact with the heat dissipating fin
13
. Therefore, it is usually quite difficult to reduce the temperature to the desired range which dramatically decreases the efficiency of the heat dissipating device
10
. Secondly, since only a small section of the delivery pipe
111
is in contact with the heat dissipating fin
13
, the effect of heat exchanging can only occur around the peripheral surfaces of the section of the delivery pipe
111
which is in contact with the heat dissipating fin
13
. Since the contacting surface is rather small, the heat dissipation is obviously not effective.
SUMMARY OF THE INVENTION
Therefore, the object of the present invention is to provide a heat dissipating device which allows the working fluid to circulate and which prolongs the time for heat exchanging and increases the surface area for heat dissipation so as to increase the efficiency of the heat dissipating device.
According to this invention, a heat dissipating device comprises a heat dissipating fin unit made of a heat-conductive material, and a heat dissipating fan unit mounted on the fin unit and operable so as to generate cooling air for cooling the fin unit. The heat dissipating device further comprises a heat exchanger including a hollow contact body that is made of a heat-conductive material, that is disposed adjacent to the fin unit, and that contains an amount of working fluid therein. The contact body is adapted to be disposed in contact with a heat generating component. The heat exchanger further includes a delivery pipe that is connected to the contact body to permit exit of the working fluid from the contact body, and a supply pipe that is connected to the contact body to permit entry of the working fluid into the contact body. The supply pipe is mounted to the heat dissipating fin unit to permit cooling of the working fluid in the supply pipe. A pump is connected to the delivery pipe and the supply pipe, and is operable so as to draw the working fluid from the contact body via the delivery pipe and to supply the working fluid into the contact body via the supply pipe. The working fluid is cooled by the fin unit while passing through the supply pipe.


REFERENCES:
patent: 5269146 (1993-12-01), Kerner
patent: 5731954 (1998-03-01), Cheon
patent: 6019165 (2000-02-01), Batchelder
patent: 6166907 (2000-12-01), Chien
patent: 6208512 (2001-03-01), Goldowsky et al.
patent: 6263957 (2001-07-01), Chen et al.
patent: 6324058 (2001-11-01), Hsiao
patent: 6327145 (2001-12-01), Lian et al.
patent: 6408937 (2002-06-01), Roy

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