Fan duct for dissipating heat of a CPU of a computer

Details Fan duct for dissipating heat of a CPU of a computer Fan duct for dissipating heat of a CPU of a computer

1999-07-01

2001-01-02

Tolin, Gerald (Department: 2835)

Electricity: electrical systems and devices

Housing or mounting assemblies with diverse electrical...

For electronic systems and devices

C312S236000, C361S809000, C454S184000

Utility Patent

active

06169656

ABSTRACT:

BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
The present invention is related to a fan duct for dissipating heat of a central processing unit (CPU) of a computer, and particularly to a fan duct which can be conveniently and reliably mounted within a computer.
As the processing speed of the CPU increases, heat generated by the CPU increases accordingly. The heat needs to be timely dissipated; otherwise, a malfunction or unstableness of the computer will happen. A fan duct is proposed to dissipate the heat generated by the CPU. The fan duct is mounted in the computer with an air inlet connected to a surrounding environment of the computer, and an air outlet facing the CPU. The fan duct is equipped with an electrical fan located below the air outlet, whereby when the fan is activated, cool air is suck into the fan duct via the inlet and directed to the CPU via the outlet, thereby keeping the temperature of the CPU within a permitted range. Related prior art can be referred to Taiwan Patent Application Nos. 84104469 and 86205661.
Referring to
FIGS. 5 and 6
, a conventional fan duct
9
is shown. The fan duct
9
is fixed to a back panel
97
of an enclosure
96
of a computer. The fan duct
9
includes a hollow, elongated main body
90
and an electrical fan
99
. The main body
90
is formed by plastic injection molding. The main body
90
has a bottom wall
92
and a side wall
91
. The bottom wall
92
defines an air outlet
94
. The side wall
91
defines a number of pinholes functioning as an air inlet
93
. Mounting posts
95
with screw holes
951
are set at four corners of the side wall
91
. The mounting posts
95
are used for mounting the main body
90
on the back panel
97
by extending four screws
971
through the back panel
97
to threadedly engage with the screw holes
951
, The fan
99
is mounted on the bottom wall
92
below the air outlet
94
. When the fan
99
is activated, as indicated by arrows of
FIG. 6
, cool air outside the enclosure
96
is driven to flow into the main body
92
via the inlet
93
and directed to a CPU (not shown) located just below the outlet
94
. Since the fan duct
9
is relatively long and the fan
99
is mounted at a point distal from the fixing point formed by the screws
971
, a large bending moment caused by a weight of the fan
99
is totally exerted to the screws
971
, whereby after a period of operation of the fan duct
9
, the connection between the screws
971
and the mounting posts
95
may become loosen, causing the fan duct
9
to function improperly.
Hence, an improved fan duct is needed to eliminate the above mentioned defects of current fan duct.
SUMMARY OF THE INVENTION
Accordingly, an objective of the present invention is to provide a fan duct which can be securely and conveniently mounted in an enclosure of a computer.
To fulfill the above mentioned objective, according to one embodiment of the present invention, a fan duct for dissipating heat generated by a central processing unit of a computer consists of a cubodial hollow main body having an air inlet and an air outlet. An electrical fan is mounted on the main body below the air outlet. A knob is attached to a top wall of the main body and located just above the fan. An enclosure of the computer has a back panel and a top cover. The back panel defines an opening. An inside of the top cover is attached with a hook. The fan duct is firstly mounted to the back panel by extending five screws through the back panel to threadedly engage with the main body. Thereafter, the top cover is mounted to the back panel to reach an assembled position wherein the knob engage with the hook whereby a portion of a weight of the electrical fan is supported by the hook.


REFERENCES:
patent: 4498123 (1985-02-01), Fuss
patent: 5703751 (1997-12-01), Huang
patent: 5788566 (1998-08-01), McAnally
patent: 5871396 (1999-02-01), Shen
patent: 5986883 (1999-11-01), Johnson
patent: 6002586 (1999-12-01), Chen

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