Abstract:
A heat dissipation device adapted for cooling an electronic device mounted on a printed circuited board includes a heat spreader thermally contacting the electronic device, a fin assembly comprising a plurality of fins, a first heat pipe interconnecting the fin assembly and the heat spreader and a plurality of supporting posts inserted in the fin assembly.

Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The disclosure relates to heat dissipation devices and, more particularly, to a heat dissipation device with a strengthened structure. 
         [0003]    2. Description of Related Art 
         [0004]    Nowadays, numerous heat dissipation devices are used to dissipate heat generated by electronic devices. Conventionally, the heat dissipation device comprises a heat spreader thermally contacting the electronic device, a fin assembly, and a heat pipe thermally connecting the fin assembly and the heat spreader. The fin assembly comprises a plurality of fins stacked together, which is prone to deforming when subjected to shock or vibration during transportation or use. 
         [0005]    What is needed, therefore, is a heat dissipation device which can overcome the limitations described. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0006]    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 embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views. 
           [0007]      FIG. 1  is an isometric, assembled view of a heat dissipation device in accordance with one embodiment of the disclosure, with a printed circuit board located below the heat dissipation device. 
           [0008]      FIG. 2  is an isometric, exploded view of the heat dissipation device of  FIG. 1 . 
       
    
    
     DETAILED DESCRIPTION 
       [0009]      FIG. 1  shows a heat dissipation device in accordance with an embodiment of the disclosure. The heat dissipation device is mounted on a printed circuit board  70  for dissipating heat generated by an electronic device  72  attached on the printed circuit board  70 . 
         [0010]    Also referring to  FIG. 2 , the heat dissipation device comprises a heat spreader  10  thermally contacting the electronic device  72 , two heat pipes  20  symmetrically disposed on the heat spreader  10 , a heat conducting member  30  mounted over the heat spreader  10  and spacing a distance from the heat spreader  10 , a fin assembly  40  attached on the heat conducting member  30  and connecting the heat pipes  20 , a fan  50  received in the fin assembly  40  and fastened on the heat conducting member  30 , and a fan cover  60  disposed on a top of the fin assembly  40 . 
         [0011]    The heat spreader  10  is made of metal such as aluminum, copper or an alloy thereof. The heat spreader  10  has a bottom face thermally contacting the electronic device  72 . Two V-shaped grooves  12  are symmetrically defined in a top face of the heat spreader  10 . 
         [0012]    The two heat pipes  20  each comprise a V-shaped evaporating section  22  corresponding to the groove  12  of the heat spreader  10  and two parallel condensing sections  24  vertically and upwardly extending from two ends of the evaporating section  22 . 
         [0013]    The heat conducting member  30  is made of metal such as aluminum, copper or an alloy thereof. The heat conducting member  30  comprises a heat conducting plate  32 , four supporting posts  34  evenly disposed on a periphery of a top of the heat conducting plate  32  and four fasteners  36  disposed on four corners of a bottom of the heat conducting plate  32 . Each supporting post  34  is a solid metal pole and defines a threaded hole  340  in a top end thereof. The heat conducting plate  32  defines four elongated through holes  320  corresponding to the condensing sections  24  of the heat pipes  20 , each through hole  320  is located between two adjacent supporting posts  34 . The heat conducting plate  32  defines three symmetrical fixing holes  322  in a center thereof. The fasteners  36  extend through holes  74  of the printed circuit board  70  and engage with a back plate  76  below the printed circuit board  70  to thereby secure the heat dissipation device on the printed circuit board  70  so that the heat spreader  10  can have an intimate engagement with the electronic device  72 . 
         [0014]    The fin assembly  40  is cylinder-shaped and comprises a plurality of spaced and parallel fins  46 . The fins  46  each are made of metal such as aluminum, copper or an alloy thereof. The fin assembly  40  defines a column-shaped receiving room  42  in a center thereof and eight spaced through holes  44  around the receiving room  42 . 
         [0015]    The fan  50  has a fixing plate  52  and an impeller (not labeled) mounted thereon. The fixing plate  52  defines three through holes  520  corresponding to the fixing holes  322  of the heat conducting plate  32 . 
         [0016]    The fan cover  60  defines a central hole  66  in alignment with a hub (not labeled) of the impeller of the fan  50 . The fan cover  60  comprises a plurality of annular strips  62  concentrically surrounding the hole  66 , and a plurality of elongated strips  64  slantwise interconnecting the annular strips  62  in such a manner that the elongated strips  64  are arranged in a volute relative to the hole  66 . The fan cover  60  is for preventing an operator from injury by carelessly touching blades (not labeled) of the impeller of the fan  50  when the fan  50  is in operation. The fan cover  60  defines four through holes  68  in an edge thereof, corresponding to the threaded holes  340  of the supporting posts  34 . 
         [0017]    In assembly, the evaporating sections  22  of the heat pipes  20  are received and soldered in the grooves  12  of the heat spreader  10 . Screws  500  extend through the through holes  520  of the fixing plate  52  of the fan  50  and engage in the fixing holes  322  of the heat conducting plate  32  to thereby fix the fan  50  on the heat conducting member  30 . The supporting posts  34  of the heat conducting member  30  extend through the through holes  44  of the fin assembly  40  to thereby securely connect the fin assembly  40  and the heat conducting member  30  together. The condensing sections  24  of the heat pipes  20  extend through the through holes  320  of the heat conducting plate  32  and the through holes  44  of the fin assembly  40  in sequence to thereby securely connect the heat pipes  20  and the fin assembly  40  together. Screws  600  extend through the through holes  68  of the fan cover  60  and engage in threaded holes  340  of the supporting posts  34  to thereby fix the fan cover  60  on the fin assembly  40 . 
         [0018]    In use, the heat spreader  10  absorbs heat from the electronic device  72  and transmits it to the heat pipes  20 . The heat pipes  20  convey the heat to the fin assembly  40 . A part of the heat in the fin assembly  40  is further conveyed to the heat conducting plate  32  via the supporting posts  34 . The fan  50  generates airflow to take the heat in the fin assembly  40  and the heat conducting plate  32  away. 
         [0019]    According to the disclosure, the supporting posts  34  inserted in the fin assembly  40  can effectively support and prevent the fin assembly  40  from deforming when subjected to vibration or shock during transportation or use. 
         [0020]    It is believed that the disclosure and its 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.