Patent Publication Number: US-2009218082-A1

Title: Heat dissipation module

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention is related to a structure of heat dissipation, and particularly to an improvement on a heat dissipation module for facilitating the assembly job and promoting the production efficiency significantly. 
     2. Brief Description of the Related Art 
     The processing speed of the electronic chip increases due to incessantly progress of technology but it leads to increase of the generated heat as well. Nevertheless, the high temperature is a primary reason of the undesirable operation efficiency and burn-out of the chip. Therefore, how to dissipate the heat from the chip for protecting the chip is one of the subjects that are researched and developed currently. In order to obtain the best effect, a plurality of cooling fins being stacked as a cooling fin set in association with the heat guide pipes are utilized in the most researches and developments for promoting the cooling efficiency. 
     Taiwan Patent Publication No. 449514 entitled “A METHOD FOR JOINING A GUIDE HEAT PIPE TO COOLING FINS” discloses a method that a soldering layer is coated on a joining surface between the guide heat pipe and the cooling fins and the joined guide heat pipe and the cooling fins heat up in a vacuum heating stove such that the solder tin can melt in the process of heating and form the phenomenon of capillary to permeate the joining surface for engagement tightly. Further, Taiwan Patent publication No. 1236337 entitled “A METHOD FOR FORMING A HEAT PIPE AND COOLING FINS discloses (a) a metal conductive medium layer is plated at a spot of the heat pipe and the cooling fins for joining the cooling fins; (b) the cooling fins are placed at the spot plated with the metal conductive medium; and (c) The conductive medium is heated up to melt between the heat pipe and the cooling fins and then cools down. 
     Although either the solder tin or the metal conductive medium of the preceding cited references is heated up for joining the heat pipe to the cooling fins, the heat pipe is circular in cross section and the cooling fins are easy to swing or rotate with respect to the heat pipe before the heat pipe is fixed to the cooling fins. That is, the heat pipe is unable to be located well during being joined to the cooling fins and it is easy to result in clearances between the heat pipe and the cooling fins to degrade the effect of heat transfer. 
     SUMMARY OF THE INVENTION 
     In order to overcome the deficiencies of the prior art, an object of the present invention is to provide a heat dissipation module, which is assembled easily for promoting production efficiency. 
     Accordingly, a heat dissipation module according to the present invention includes a plurality of cooling fins and at least a guide heat pipe. The cooling fins stack to one another with at least a through hole at the respective cooling fin for being penetrated with the guide heat pipe. A projecting annular part is disposed at a side of the respective cooling fin to surround the circumference of the through hole with an indented spot at the periphery of the projecting annular part. The outer side of said guide heat pipe has an elongated recess extending along the length thereof to correspond to the indented spot such that the indented spot is capable of fitting with the recess after the guide heat pipe passing through the through hole respectively to facilitate the subsequent welding job. 
     Wherein, the protrusion part can be circular or the square shape. Further, a plurality of the protrusion parts can be arranged irregularly on the plate member such that the effect of different eddy currents at the periphery of the cooling fin can be produced advantageously and the slots at the lateral sides of the respective protrusion part are helpful for increasing the coefficient of heat exchange of the cooling fin and enhancing the integral performance of the cooling fin. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The detail structure, the applied principle, the function and the effectiveness of the present invention can be more fully understood with reference to the following description and accompanying drawings, in which: 
         FIG. 1  is a perspective view of a cooling fin in a heat dissipation module according to a preferred embodiment of the present invention; 
         FIG. 2  is a perspective view illustrating the cooling fin shown in  FIG. 1  being penetrated by two guide heat pipes; 
         FIG. 3  is a sectional view of  FIG. 2 ; and 
         FIG. 4  is a perspective view of a heat dissipation module according to the present invention in which a plurality of the cooling fins stacking to each other and being penetrated by the heat guide pipes. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring to  FIGS. 1 to 4 , a heat dissipation module according to a preferred embodiment of the present invention includes a plurality of cooling fins  1  and at least a guide heat pipe  2 . The cooling fins  1  are stacked to one another. Each cooling fin  1  has at least a circular through hole  11  corresponding to the guide heat pipe  2 . A side of the respective cooling fin  1  provides a projecting annular part  12  to surround the circumference of the through hole  11 . The projecting annular part  12  has an indented spot  121  at the periphery thereof. The guide heat pipe  2  provides an elongated recess  21 , which is formed continuously or discretely, extending along the length of the guide heat pipe  2  corresponding to the indented spot  121  such that the indented spot  121  can fit with the recess  21 . 
     As the foregoing, the guide heat pipe  2  penetrates the through hole  11  of the respective stacked cooling fin in a way of the elongated recess  21  fitting with the indented spot  121  of the respective annular part  12  such that it facilitates the subsequent welding job for joining the guide heat pipe  2  to the respective cooling fin  1  firmly. 
     It is appreciated that the heat dissipation module according to the present invention is composed of a plurality of stacked cooling fins  1  and at least a guide heat pipe  2  with an projecting annular ring  12 , which surrounds an end of at lest a through hole  11  of the respective cooling fin  1 , having an indented spot  121  fitting with an elongated recess  21  of the guide heat pipe  2  to facilitate the subsequent welding job for joining the guide heat pipe  2  to the cooling fins firmly. 
     While the invention has been described with referencing to the preferred embodiment thereof, it is to be understood that modifications or variations may be easily made without departing from the spirit of this invention, which is defined by the appended claims.