Patent Application
20090166011
1. Field of the Invention
The present invention relates generally to a heat dissipation device, and particularly to a heat dissipation device having a heat sink and mounting brackets which not only can mount a fan on the heat sink but also can mount the heat sink on a board.
2. Description of Related Art
A computer central processing unit (CPU) mounted on a printed circuit board (PCB) is the core administrator of electrical signals in most contemporary personal computers. Continued development of CPUs has enabled them to perform more and more functions. Heat generated by the CPUs has increased enormously. Such heat can adversely affect the operational stability of the computers. Measures must be taken to efficiently remove the heat from the CPU.
Typically, a heat sink assembly is mounted on the PCB and contacts the CPU to dissipate heat generated by the CPU. The heat sink assembly comprises a heat sink having a heat spreader and a plurality of fins mounted on the heat spreader. A pair of fan covers is mounted on a top of the heat sink at opposite sides of the heat sink by screws extending through the fan covers and threadedly engaging with fins of the heat sink. The fan covers are used for mounting a fan on the heat sink to provide forced airflow to the heat sink. A pair of frames is attached to opposite sides of the heat spreader of the heat sink. A plurality of fasteners extend through the frames and the PCB for mounting the heat sink assembly on the PCB.
However, the process of mounting the fan covers need to form holes in the fan covers and outmost fins of the opposite sides of the heat sink, which is unduly time-consuming and inconvenient. Furthermore, the separate forming of the fan covers and the frames increases the production cost of the heat sink assembly.
Therefore, it is desirable to provide a heat dissipation device having a plurality of mounting bracket for facilitating to firmly fasten a fan to a heat sink and to mount the heat dissipation device on a printed circuit board.
The present invention relates to a heat dissipation device includes a heat sink, a plurality of mounting brackets and a fan. The heat sink comprises a central core, a plurality of branches at a circumference of the core and a plurality of fins extending outwardly from the core and branches. Each of the branches has a locking part at distal end thereof. Each of the mounting brackets comprises a mounting plate engaging with the locking part, a supporting part extending outwardly from a top end of the mounting part and a fixing part extending outwardly from a bottom end of the mounting plate. The fan is supported and secured on the supporting part.
Other advantages and novel features will become more apparent from the following detailed description of preferred embodiments when taken in conjunction with the accompanying drawings, in which:
Many aspects of the present embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present embodiment. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
Referring to
As shown in
Particularly referring to
Each of the fixtures 30 includes an operating member 32 and a latching member 34. The operating member 32 comprises a handle 320 at top end thereof, a sleeve 322 extending downwardly from the handle 320 and an inserting peg 324 extending from a centre of bottom surface of the handle 320. The latching part 34 comprises a cylinder 340 having a hollow hole therein and a barb 342 at bottom end thereof. The barb 342 therein defines a hollow hole which communicates with the hollow hole of the cylinder 340 and receives the inserting peg 324 therein. To assemble the fixtures 30 to the mounting brackets 20, the operating members 32 are disposed on the fixing parts 26 of the mouthing brackets 20 and the inserting pegs 324 of the operating members 32 are received in the through holes 260 of the fixing parts 26, the cylinders 340 of the latching parts 34 are then inserted into the sleeves 322 through the through holes 260 and the inserting pegs 324 are simultaneously inserted into the through hole of the barbs 342 of the latching parts 34. The fixture 30 is in an unlocking state when a bottom end of the peg 324 is received in the cylinder 340 and has not yet reached the barb 342; the fixture can be turned into a locking state by pressing the handle 320 downwardly to push the bottom end of the peg 324 into the barb 342 and expand the barb 342 dramatically.
The fan 40 comprises a circular frame and a motor received in the frame. The frame has four triangular ears 42 extending outwardly from a circumferential sidewall thereof. A piercing hole 420 is defined in each of the ears 42 and receives one of the screws 100 therein.
Also referring to
To use of the heat dissipation device, the heat sink 10 is placed on the heat-generating component 52 and the barbs 342 of the fixtures 30 in the unlocking state are inserted into the corresponding mounting holes 54 of the printed circuit board 50. The fixtures 30 are then turned from the unlocking state into the locking state, whereby the barbs 342 are expanded and held beneath the printed circuit board 50 to lock the heat dissipation device securely onto the heat-generating component 52.
It is believed that the present embodiments and their advantages will be understood from the foregoing description, and it will be apparent that various changes may be made thereto without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the examples hereinbefore described merely being preferred or exemplary embodiments of the invention.
