1. Technical Field
The present disclosure relates to thermal modules, and more particularly to a thermal module which has a low manufacture cost.
2. Description of Related Art
With continuing development of the electronic technology, electronic components such as CPUs (central processing units) generate more and more heat required to be dissipated immediately. Therefore, thermal modules are widely used to help dissipating heat of the electronic components.
A typical thermal module includes a mounting plate, a fan housing integrally formed with the mounting plate, an impeller rotatably received in the fan housing, a fin assembly mounted at an air outlet of the fan housing, a heat absorbing plate mounted at a bottom side of the mounting plate, and a heat pipe connecting the fin assembly with the heat absorbing plate. The mounting plate secures the heat absorbing plate onto the electronic component to absorb heat therefrom. The mounting plate and the fan housing are integrally formed from a metallic material by die-casting. The mould of the die-casting has a great difficulty in design, and the material cost of the thermal module is relatively high. Therefore, the thermal module has a high manufacture cost.
For the foregoing reasons, a thermal module which can overcome the described shortcomings is desired.
Many aspects of the 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 disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
Referring to
The two centrifugal fans 20 have structures identical to each other. The two centrifugal fans 20 are respectively mounted on left and right lateral sides of the mounting plate 10. Each of the two centrifugal fans 20 includes a fan housing 21 and an impeller 22 rotatably received in the fan housing 21. The fan housing 21 includes a base 210 and a cover 211 covering on the base 210. The cover 211 and the base 210 cooperatively enclose the impeller 22 therein. The base 210 is made of a plastic material, such as PBT (polybutylece terephthalate). The base 210 includes a bottom plate 212 and a side wall 213 extending upwardly from a periphery of the bottom plate 212. The bottom plate 212 faces the cover 211. The side wall 213 is located between the cover 211 and the bottom plate 212. The cover 211 and the bottom plate 212 each define an air inlet 214 which faces the impeller 22. The side wall 213 defines the air outlet 215, which is perpendicular to the air inlets 214. The cover 211 protrudes a plurality of ears 216 outwardly and horizontally from an outer edge thereof. The side wall 213 protrudes a plurality of ears 216 outwardly and horizontally from a top thereof corresponding to the ears 216 of the cover 211. Each of the ears 216 defines a through hole 217 therein. The through hole 217 of each of the ears 216 of the cover 211 aligns with the through hole 217 of a corresponding ear 216 of the side wall 213 for receiving a fastener, such as a screw to secure the cover 211 on the base 210. The cover 211 is made of a metallic material. The cover 211 includes a securing flake 23 formed at the outer edge thereof. The securing flake 23 is substantially L-shaped. The securing flake 23 includes an arm portion 231 extending downwardly from the outer edge of the cover 211 and a securing portion 232 extending perpendicularly and outwardly from a bottom end of the arm portion 231 towards the mounting plate 10. The arm portion 231 protrudes a rib 2310 outwardly therefrom. The rib 2310 is strip-shaped and extends linearly from a top end of the arm portion 231 towards the bottom end of the arm portion 231. The rib 2310 increases a mechanical strength of the arm portion 231. The securing portion 232 is parallel to the cover 211. The securing portion 232 is secured on the mounting plate 10, to thereby secure the centrifugal fan 20 onto the mounting plate 10. In this embodiment the securing portion 232 of the securing flake 23 is welded to the mounting plate 10. Alternatively, fastening means such as screw or clip can be adopted to secure the securing portion 232 to the mounting plate 10.
The two fin assemblies 30 are respectively mounted at the air outlets 215 of the two centrifugal fans 20. Each of the two fin assemblies 30 includes a plurality of fins 31 stacked together. An air passage channel 32 is formed between every two adjacent fins 31. The air passage channels 32 of the fin assembly 30 communicate with the air outlet 215 of the centrifugal fan 20.
Referring to
The two heat pipes 50 are flat. Each of the heat pipes 50 includes an evaporation section 51 and a condensation section 52 at two opposite ends thereof. The heat absorbing plate 40 is a rectangular plate made of a highly heat conductive material, such as copper. The heat absorbing plate 40 is received in the notch 12 of the mounting plate 10. An upper surface of the heat absorbing plate 40 is exposed to an outside through the opening 13 of the mounting plate 10. The evaporation sections 51 of the two heat pipes 50 are attached to the upper surface of the heat absorbing plate 40 via the opening 13 of the mounting plate 10. The condensation section 52 of each of the heat pipes 50 extends into a corresponding fin assembly 30.
In the thermal module 100, the fan housings 21 of the centrifugal fans 20 are formed separately from the mounting plate 10, the bases 210 of the fan housings 21 are made of plastic material and the mounting plate is made of metallic material. The centrifugal fans 20 are mounted to the mounting plate 10 by the securing flakes 23 of the fan housings 21, whereby the mould for manufacturing the mounting plate 10 is easy to design and the material cost of the thermal module 100 is relatively reduced. Therefore, the thermal module 100 has a lower manufacture cost. Furthermore, the centrifugal fans 20 are disposed immediately neighboring to the mounting plate 10, to thereby enhance a compactness of the structure of the thermal module 100. Moreover, the centrifugal fans 20 are disposed immediately neighboring to the mounting plate 10 and firmly mounted to the mounting plate 10, which reduces a length of the heat pipe 50 in connecting the heat absorbing plate 40 with the fin assembly 30 and accordingly avoids a possible deformation of the heat pipe 50.
Alternatively, the centrifugal fans 20 can be secured on the mounting plate 10 by other securing structure formed on the centrifugal fans 20.
It is to be understood that even though numerous characteristics and advantages of the disclosure have been set forth in the foregoing description, together with details of the structure and function of the embodiments, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Number | Date | Country | Kind |
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200910304613.3 | Jul 2009 | CN | national |