BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a heat dissipation device, and more particularly to a heat dissipation device which has enhanced heat removal capability.
2. Related Art
Many electronic devices, such as Central Processing Units (CPUs), generate a lot of heat during normal operation. This can deteriorate their operational stability. Thus the heat must be removed quickly to ensure normal operation of the electronic device. A heat dissipation device is often attached to a top surface of the electronic device, to remove heat therefrom.
A conventional heat dissipation device is shown in FIG. 5. The device 2 is conventionally formed by extrusion, which significantly limits the amount of heat dissipation surface which can be produced. Furthermore, the device 2 is relatively heavy compared to a typical electronic device which it is designed to service.
Another conventional heat dissipation device is shown in FIG. 6. The device 4 includes a chassis 6 defining a plurality of grooves (not labeled) therein, and a plurality of fins 8 inserted into the grooves. The heat dissipation surface of the device 4 is greater than that of the device 2. However, installation of the fins 8 into the chassis 6 is time-consuming and costly. Furthermore, during normal use entailing vibration and shock, the fins 8 of the device 4 are prone to dislodge within the grooves of the chassis 6. This results in gaps forming between the fins 8 and the chassis 6, thereby reducing the efficiency of heat transfer. Thus the heat dissipation device 4 does not reliably remove heat.
- SUMMARY OF THE INVENTION
It is strongly desired to provide a heat dissipation device which resolves the above-mentioned problems.
Accordingly, an object of the present invention is to provide a heat dissipation device with a large surface area for increasing the efficiency of heat removal.
Another object of the present invention is to provide a heat dissipation device comprising two easily manufactured parts readily assembled together.
To achieve the above objects, a heat dissipation device in accordance with the present invention comprises a chassis and a fin member. The chassis is formed as a single unit by extrusion, and includes a top surface. Four parallel ribs are formed on the top surface. A pair of parallel slots is defined in the top surface adjacent respective outermost ribs, and is adapted for connection to a conventional fan frame. The chassis forms a pair of shoulders at respective opposite sides thereof, adapted to support the fan frame thereon. The fin member is formed from a single plate, and defines four parallel grooves and a channel therethrough. The channel is defined between the two innermost grooves, and is adapted to interferentially receive a conventional clip. The clip secures the heat dissipation device to a heat-generating electronic device. The four grooves interferentially receive the ribs of the chassis, thereby securely attaching the fin member to the chassis.
- BRIEF DESCRIPTION OF THE DRAWINGS
Other objects, advantages and novel features of the present invention will be drawn from the following detailed embodiment of the present invention with attached drawings, in which:
FIG. 1 is an exploded view of a heat dissipation device in accordance with the present invention;
FIG. 2 is an assembled view of FIG. 1;
FIG. 3 is a side elevation view of FIG. 2;
FIG. 4 shows the assembled heat dissipation device attached to a conventional heat sink clip and a conventional fan assembly.
FIG. 5 is a perspective view of a conventional heat dissipation device; and
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
FIG. 6 is a perspective view of another conventional heat dissipation device.
Referring to FIG. 1, a heat dissipation device 1 in accordance with the present invention includes a chassis 10 and a fin member 20 interferentially mountable on the chassis 10.
The chassis 10 is formed as a single unit by extrusion, and comprises a top surface 11 and a bottom surface 12. Four parallel ribs 13 are formed on the top surface 11, at uniform intervals. A pair of U-shaped slots 14 is defined in the top surface 11, parallel to and adjacent innermost extremities of the respective outermost ribs 13. Thus each outermost rib 13 defines an outer limit of its adjacent slot 14. A pair of longitudinal shoulders 15 is formed at respective opposite sides of the chassis 10, the shoulders 15 being perpendicular to the ribs 13. An upper surface of each shoulder 15 is lower than the slots 14 of the chassis 10.
The fin member 20 is concertinaed from a single plate to provide maximum surface area for heat dissipation. The fin member 20 extends continuously with upper surfaces 24 and lower surfaces 25 alternately bridged by the vertical planes 26. Lower surfaces 25 of the fin member 20 are coplanar. Four parallel grooves 21 are defined throughout a bottom of the fin member 20, and are dimensioned to interferentially engage with the corresponding ribs 13 of the chassis 10. A channel 22 is defined throughout a bottom of the fin member 20, and extends in a direction perpendicular to the vertical planes 26. The channel 22 is parallel to the grooves 21, and is located between the two innermost grooves 21. The channel 22 is dimensioned to interferentially receive a conventional heat sink clip 60 (see FIG. 4).
Referring also to FIGS. 2 and 3, in assembly, the fin member 20 is placed on the chassis 10. The ribs 13 of the chassis 10 interferentially engage with the grooves 21 of the fin member 20. The lower surfaces 25 of the fin member 20 abut the top surface 11 of the chassis 10. Thus the heat dissipation device 1 is readily assembled for use as a single unit.
Referring also to FIG. 4, the heat dissipation device 1 is adapted to readily receive the conventional heat sink clip 60 and a conventional fan assembly. The clip 60 is adapted to engage with a retention module (not shown), and thus secure the bottom surface 12 of the heat dissipation device 1 to an electronic device (not shown). The fan assembly comprises a fan 30 attached to a top of a fan frame 50 by conventional means, and screws 40 for attaching the fan frame 50 to the heat dissipation device 1.
The fan frame 50 is generally U-shaped, with an opening 52 defined at a bottom of each opposite sidewall 54. The openings 52 are located and dimensioned to correspond to the channel 22 of the fin member 20. A screw hole 51 is defined near each bottom corner of each sidewall 54 of the fan frame 50. The screw holes 51 are located and dimensioned to correspond to the slots 14 of the chassis 10.
Final assembly entails putting together the heat dissipation device 1, the clip 60 and the fan assembly. The clip 60 is received in the channel 22 of the fin member 20. The fan frame 50 is placed over the fin member 20, such that bottom edges (not labeled) of the sidewalls 54 of the fan frame 50 abut respective shoulders 15 of the chassis 10. The screws 40 are inserted into the screw holes 51 of the fan frame 50, and then screwed into the slots 14 of the chassis 10. The channel 22 of the fin member 20 and the openings 52 of the fan frame 50 cooperate to prevent the heat dissipation device 1 from moving relative to the clip 60 in a normal direction.
Other advantages of the heat dissipation device 1 include:
1. The chassis 10 is easily extruded from a single plate. The fin member 20 is also easily formed from a single plate. The plate for the fin member 20 is first stamped to specification, and then concertinaed. Thus manufacture of the heat dissipation device 1 is simple.
2. Since the chassis 10 and the fin member 20 are made separately before being coupled together, the fin member 20 is produced without the limitations inherent in extrusion processes. Thus the fin member 20 can be readily manufactured to have a large surface area for enhanced heat dissipation capability.
3. Since the chassis 10 and the fin member 20 are made separately before being coupled together, they can be readily formed from different materials. The material of the chassis 10 can be selected to provide maximum heat transfer from an electronic device, and the material of the fin member 20 can be selected to provide maximum heat dissipation from the fin member 20.
It is understood that the invention may be embodied in other forms without departing from the spirit thereof. Thus, the present example and embodiment is to be considered in all respects as illustrative and not restrictive, and the invention is not to be limited to the details given herein.