Abstract:
An exemplary heat dissipation device includes a heat sink defining air passages therein, a fan holder fixedly mounted on the heat sink, a fan mounted on the fan holder, and an adjustable wind-guiding module located in and pivoted to the fan holder. The fan is positioned for generating an airflow flowing through the adjustable wind-guiding module generally toward the air passages of the heat sink. The adjustable wind-guiding module is selectably pivotable with respect to the fan holder such that a direction of the airflow generally toward the air passages of the heat sink is changed accordingly.

Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The disclosure relates to heat dissipation devices and, more particularly, to a heat dissipation device for dissipating heat generated by an electronic component and an electronic device using the heat dissipation device. 
         [0003]    2. Description of Related Art 
         [0004]    With the increasing development of computer technology, electronic components such as central processing units (CPUs) are able to operate at higher speeds and have greater functional capabilities. When an electronic component operates at high speed, it frequently generates large amounts of heat. The heat must be quickly removed from the electronic component to prevent it from becoming unstable or being damaged. Typically, a heat dissipation device is attached to an outer surface of the electronic component to absorb heat from the electronic component. The heat absorbed by the heat dissipation device is then dissipated to ambient air. 
         [0005]    A typical heat dissipation device includes a heat sink and a fan mounted on the heat sink. The heat sink is attached to an outer surface of an electronic component to absorb heat generated by the electronic component. The fan provides a downward airflow flowing through the heat sink to take away the heat absorbed by the heat sink, thereby helping to keep the electronic component cool. However, a direction of the airflow produced by the fan is a fixed downward direction. That is, the fan only blows toward the electronic component located below the heat sink. The fan is basically unable to carry away heat generated by other electronic components located around the electronic component below the heat sink. 
         [0006]    What is need, therefore, is a heat dissipation device that can overcome the above-described limitations, and an electronic device using such heat dissipation device. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0007]    Many aspects of the disclosure 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 disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views. 
           [0008]      FIG. 1  is an isometric, assembled view of a heat dissipation device in accordance with an embodiment of the disclosure, showing the heat dissipation device ready to be attached on a printed circuit board with three electronic devices mounted thereon. 
           [0009]      FIG. 2  is an exploded view of the heat dissipation device of  FIG. 1 , but viewed from another direction different from that of  FIG. 1 . 
           [0010]      FIG. 3  is an exploded view of a fan holder and an adjustable wind-guiding module of the heat dissipation device of  FIG. 2 . 
           [0011]      FIG. 4  is an inverted view of  FIG. 3 . 
           [0012]      FIG. 5  is an assembled view of  FIG. 4 , showing wind-guiding wings of the adjustable wind-guiding module in vertical orientations. 
           [0013]      FIG. 6  is a cutaway view of  FIG. 5 , and showing the wind-guiding wings adjusted to be sloped, wherein tops of the wind-guiding wings point up toward the left side. 
           [0014]      FIG. 7  is a cutaway view of  FIG. 5 , and showing the wind-guiding wings adjusted to be sloped, wherein tops of the wind-guiding wings point up toward the right side. 
       
    
    
     DETAILED DESCRIPTION 
       [0015]    Referring to  FIGS. 1-2 , these illustrate a heat dissipation device in accordance with an embodiment of the disclosure. The heat dissipation device is used to dissipate heat generated by an electronic component  100  mounted on a printed circuit board (not labeled). The heat dissipation device comprises a heat sink  10 , a clip  20  for securing the heat sink  10  to a top surface of the electronic component  100 , a fan  30  located over the heat sink  10 , a fan holder  40  sandwiched between the heat sink  10  and the fan  30 , and an adjustable wind-guiding module  60  mounted in the fan holder  40 . The adjustable wind-guiding module  60  changes a flow direction of an airflow produced by the fan  30  according to actual needs. The fan holder  40  secures the fan  30  to a top of the heat sink  10 . 
         [0016]    The heat sink  10  has a rectangular configuration. The heat sink  10  is made of material with high conductivity, such as aluminum or copper. The heat sink  10  comprises a heat spreader  11 , and a plurality of fins  12  arranged on a top surface of the heat spreader  11 . The fins  12  are arranged in an m×n array, and are parallel to each other. The fins  12  are spaced from each other to form a plurality of air passages  13 . The air passages  13  are arranged in a crisscross pattern. The array of fins  12  includes two rows of endmost fins  12  at each of two opposite sides of the array. In each such row of endmost fins  12 , the fins  12  are arranged such that main flat sides of the endmost fins  12  are all parallel with one another. The two endmost fins  12  located at a middle of the row have a height less than that of the other fins  12  in the row. 
         [0017]    The clip  20  comprises a resilient member  24 , a first latching portion  25  bending downwards from a first end of the resilient member  24 , a handle  22 , and a second latching portion  23 . The handle  22  is pivotably connected to a second end of the resilient member  24 , the second end being opposite to the first end. The second latching portion  23  is pivotably connected to the handle  22 . The resilient member  24  is received in a corresponding air passage  13  in a middle of the heat sink  10 . The resilient member  24  elastically resists the top surface of the heat spreader  11 . The handle  22 , the first latching portion  23  and the second latching portion  25  extend beyond the opposite sides of the heat sink  10 . The first and second latching portions  23 ,  25  clasp a retention module (not shown) around the electronic component  100 . 
         [0018]    The fan  30  comprises a rectangular frame  31 . The frame  31  comprises a pair of parallel plates  33 . Four locating holes  32  are defined through the two plates  33  at four corners of the frame  31 , respectively. 
         [0019]    Also referring to  FIGS. 3-4 , the fan holder  40  comprises a supporting plate  42  defining a circular opening  41  in a center thereof, and two mounting plates  43  extending downwardly and perpendicularly from two opposite sides of the supporting plate  42 . The opening  41  is in communication with corresponding air passages  13 . Four pins  44  extend upwardly and perpendicularly from four corners of an upper side of the supporting plate  42 , corresponding to the locating holes  32  of the fan  30 . Four hooks  45  extend perpendicularly and upwardly from four corners of the upper side of the supporting plate  42 . Two of the hooks  45  extend from two opposite ends of a top edge of one of the mounting plates  43 , and the other two hooks  45  extend from two opposite ends of a top edge of the other one of the mounting plates  43 . The hooks  45  are adjacent an outer edge of the supporting plate  42 , and are adjacent corresponding pins  44 , respectively. The pins  44  are received in corresponding locating holes  32  of the fan  30  to prevent the fan  30  from moving in directions parallel to the plates  33 . The hooks  45  clasp a bottom one of the plates  33  of the fan  30  onto the supporting plate  42 , to secure the fan  30  to the fan holder  40 . 
         [0020]    A central portion of a bottom end of each the mounting plate  43  bends inwardly to form a resisting portion  48 . The resisting portions  48  are seated on the fins  12  located at the middle of the opposite sides of the heat sink  10 , respectively. In this manner, each of the mounting plates  43  extends beyond the fins  12  located at the opposite sides of the heat sink  10 . Each mounting plate  43  has two opposite ends thereof overlapping with corresponding fins  12 . A plurality of screws  49  extend through the mounting plates  43  and engage in the corresponding fins  12  to fasten the fan holder  40  on the heat sink  10  (see  FIG. 1 ). Each of the mounting plates  43  defines a plurality of pivoting holes  46  and an elongated horizontal slot  47  below the pivoting holes  46 . The pivoting holes  46  of each mounting plate  43  are arranged in a straight line parallel to the top edge of the mounting plate  43 . The horizontal slots  47  correspond to the resisting portions  48 . 
         [0021]    The adjustable wind-guiding module  60  comprises a plurality of wind-guiding wings  50 , a generally T-shaped connecting frame  70  located at a side of the wind-guiding wings  50  and an adjuster  80  connecting the connecting frame  70  with a corresponding mounting plate  43  of the fan holder  40 . The wind-guiding wings  50  are parallel to each other, and are for guiding the airflow produced by the fan  30  towards a selected direction. 
         [0022]    Each of the wind-guiding wings  50  has an elongated configuration. Each wind-guiding wing  50  has an upper side and a lower side. The upper side of each wind-guiding wing  50  has a thickness larger than that of the lower side. A first pivot  52  is formed at a first end of each wind-guiding wing  50 , and is located near the lower side of each wind-guiding wing  50 . Two second pivots  51  extend outwards from the first end and a second end of each wind-guiding wing  50 , respectively, the second end being opposite to the first end. The second pivots  51  are located near the upper side of each wind-guiding wing  50 . The first pivot  52  and the second pivot  51  located at the first end are spaced from each other. The second pivots  51  of the wind-guiding wings  50  are inserted into corresponding pivoting holes  46  of the mounting plates  43 , so that the wind-guiding wings  50  are pivotably connected to the mounting plates  43  of the fan holder  40 . The wind-guiding wings  50  are able to rotate relative to the mounting plates  43 . The first pivots  52  are pivotably connected to the connecting frame  70 . 
         [0023]    The connecting frame  70  comprises an elongated driving plate  71 , and a connecting portion  72  extending downwardly from a central part of the driving plate  71 . The first pivot  52  of each wind-guiding wing  50  is pivoted to the driving plate  71 . The connecting portion  72  defines a vertical slot  73 . The adjuster  80  comprises a bolt  81  and a knob  82  threadedly connected with the bolt  81 . The knob  82  is located outside of the fan holder  40 . The bolt  81  extends through the vertical slot  73  and the horizontal slot  47  of the corresponding mounting plate  43  of the fan holder  40  in that order to threadedly engage with the knob  82 , thereby securing the connecting frame  70  to the corresponding mounting plate  43 . 
         [0024]    In adjustment of the airflow direction of the fan  30 , first, the knob  82  is unscrewed from the bolt  81  slightly. Then the bolt  81  is slid in the horizontal slot  47  of the corresponding mounting plate  43  of the fan holder  40  to drive the connecting frame  70  to move relative to the corresponding mounting plate  43  to a desired position. Finally, the knob  82  is screwed tightly on the bolt  81 . During the bolt  81  sliding transversely relative to the corresponding mounting plate  43  of the fan holder  40 , the bolt  81  is simultaneously able to slide up or down slightly in the vertical slot  73  of the connecting frame  70 . Thereby, the vertical slot  73  allows the bolt  81  to freely slide along the horizontal slot  47 . In a process of the connecting frame  70  moving relative to the corresponding mounting plate  43 , since the first pivots  52  and the second pivots  51  of the wind-guiding wings  50  are respectively pivoted to the connecting frame  70  and the mounting plates  43 , the connecting frame  70  drives the wind-guiding wings  50  to rotate relative to the mounting plates  43 . 
         [0025]    Referring to  FIG. 5 , this shows the bolt  81  of the adjuster  80  in a middle of the horizontal slot  47 . In this position, the wind-guiding wings  50  are in a vertical state. Referring to  FIG. 6 , this the bolt  81  located at a first end of the horizontal slot  47 . In this position, the wind-guiding wings  50  are turned towards a first side of the fan holder  40 , thereby guiding the airflow produced by the fan  30  towards the first side of the fan holder  40 . Referring to  FIG. 7 , this shows the bolt  81  located at a second end of the horizontal slot  47 , the second end being opposite the first end. In this position, the wind-guiding wings  50  are turned towards a second side of the fan holder  40 , thereby guiding the airflow produced by the fan  30  towards the second side of the fan holder  40 , the second side being opposite to the first side. 
         [0026]    From the above description, it can be seen that the airflow is able to be adjusted to blow towards a selected one of other electronic components  200  located around the electronic component  100 , thereby carrying away heat generated by the other electronic component  200 . In addition, the connecting frame  70  and the wind-guiding wings  50  are received in the fan holder  40 , decreasing a volume of the heat dissipation device. 
         [0027]    It is to be understood, however, that even though numerous characteristics and advantages of certain embodiments have been set forth in the foregoing description, together with details of the structures and functions 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.