Abstract:
A cooling system is used for cooling a plurality of electronic components received in a casing. The casing defines an air outlet. The cooling system includes at least one fan received in the casing, an air tachometer, and a controller. The air tachometer is arranged adjacent to the air outlet, and is used for measuring an airflow speed of the air outlet. The controller is electrically connected to the at least one fan and the air tachometer, and used for comparing a threshold value with the airflow speed detected by the air tachometer, and controlling a rotating speed of the at least one fan based on the comparing result.

Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The present disclosure relates to cooling systems and, particularly, to a cooling system with the ability to intelligently use the cooling power of fans. 
         [0003]    2. Description of Related Art 
         [0004]    The cooling systems of computers may run at full speed constantly during the time that computers are working. However, when the number of electronic components decrease (such as, memory chips are dismantled), the computer does not need so much cooling power, and thus it is a waste of power to keep the cooling systems running at full speed. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0005]    Many aspects of the present disclosure should be better understood with reference to the following drawings. The units 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. 
           [0006]      FIG. 1  is an isometric view of a cooling system including shielding plates and a casing accordance with an exemplary embodiment, the shielding plates being in a first state. 
           [0007]      FIG. 2  is an isometric view of the cooling system and the casing of  FIG. 1  without a top plate, the shielding plates being in a second state. 
           [0008]      FIG. 3  is an isometric view of a first shielding plate, a first sliding device, and a first driver of the cooling system of  FIG. 1 . 
           [0009]      FIG. 4  is a schematic block diagram of circuitry of the cooling system of  FIG. 1 . 
       
    
    
     DETAILED DESCRIPTION 
       [0010]    Embodiments of the present disclosure will now be described in detail, with reference to the accompanying drawings. 
         [0011]    Referring to  FIGS. 1-3 , a cooling system  100  is used for cooling a number of electronic components  500  received in a hollow casing  300 . The casing  300  may be a computer casing. The casing  300  is substantially cuboid, and includes a first sidewall  31 , a second sidewall  32 , a third sidewall  33 , and a fourth sidewall  34 , a bottom plate  35 , and a top plate  36 . The second sidewall  32  is opposite to the first sidewall  31 . The third sidewall  33  is perpendicularly connected between the first sidewall  31  and the second sidewall  32 . The fourth sidewall  34  is opposite to the third sidewall  33 , and is perpendicularly connected between the first sidewall  31  and the second sidewall  32 . The bottom plate  35  is perpendicularly connected to the sidewalls  31 - 34 . The top plate  36  is opposite to the bottom plate  35 . The bottom plate  35  is used for fixing the electronic components  500 . The electronic components  500  may include a central processing unit (CPU), a memory, and/or a hard disk. 
         [0012]    The first sidewall  31  defines a number of first through holes  311 , and the second sidewall  32  defines a first air outlet  321 . The third sidewall  33  defines a second air outlet  331  adjacent to the second sidewall  32 . The fourth sidewall  34  defines a third air outlet  341  adjacent to the second sidewall  32 . In this embodiment, the second sidewall  32  defines a number of second through holes  322  adjacent to the third sidewall  33 . 
         [0013]    Also referring to  FIG. 4 , the cooling system  100  includes four fans  10 , a first shielding plate  11 , a first sliding device  12 , a first driver  13 , a first air tachometer  14 , a second shielding plate  15 , a second sliding device  16 , a second driver  17 , a second air tachometer  18 , a third shielding plate  19 , a third sliding device  20 , a third driver  21 , a third air tachometer  22 , and a controller  23 . The number of the fans  10  is not limited to this embodiment. 
         [0014]    The four fans  10  are mounted adjacent to the first sidewall  31  side by side. Each of the four fans  10  has an air inlet surface  10   a  facing the first through holes  311  and an air outlet surface  10   b  facing the second sidewall  32 . In this embodiment, the third sidewall  33  defines a number of third through holes  231  adjacent to the fans  10 , the fourth sidewall  34  defines a number of fourth through holes  232  adjacent to the fans  10 , and thus the fans  10  easily draw cool air from outside of the casing  300  to achieve effective cooling. 
         [0015]    The first shielding plate  11  is substantially rectangular, and slidably covers the first air outlet  321  to change an opening size of the first air outlet  321 . The first sliding device  12  is positioned on the second sidewall  32 , and includes a stripe-shaped first sliding rail  121  and a stripe-shaped second sliding rail  122  parallel to the first sliding rail  121 . 
         [0016]    The first sliding rail  121  is positioned on a side of the first air outlet  321  adjacent to the top plate  36 . The first sliding rail  121  defines a U-shaped first blind sliding slot  120   a  facing the bottom plate  35  and has two parallel sidewalls  121   a  and a stopper  121   b  connecting between the two sidewalls  121   a.  The stopper  121   b  is on one end of the first sliding rail  121 . The two sidewalls  121   a  and the stopper  121   b  cooperatively form the first sliding slot  120   a.    
         [0017]    The second sliding rail  122  is positioned on a side of the first air outlet  321  adjacent to the bottom plate  35 . The second sliding rail  122  is similar to the first sliding rail  122 , except that a U-shaped second sliding slot  122   a  defined in the second sliding rail  122  extending through the second sliding rail  122  along a direction from the top plate  36  to the bottom plate  35 . 
         [0018]    The first driver  13  is used for driving the first shielding plate  11  to slide, and includes a first motor  131 , two wheels  132 , a transporting loop  133  sleeving on the two wheels  132 , and a connecting element  134 . The first motor  131  includes a driving shaft  131   a  extending through a center of one of the two wheels  132 . One end of the first shielding plate  11  is received in the sliding slot  120   a,  and the other end of the shielding plate  11  extends through the second sliding slot  122   a  to be fixed on the transporting loop  133 . The connecting element  134  is used for connecting the first shielding plate  11  to the transporting loop  133 . The first motor  131  is used for driving one of the two wheels  132  to rotate, and thus the transporting loop  133  drives the first shielding plate  11  to slide along the first sliding rail  121  and the second sliding rail  122 . 
         [0019]    The first air tachometer  14  is positioned adjacent to the first air outlet  321 , and is used for measuring the airflow speed of the first air outlet  321 . 
         [0020]    The configuration of the second shielding plate  15  is substantially the same as that of the first shielding plate  11 . The second sliding plate  15  slidably covers the second air outlet  331  to change an opening size of the second air outlet  331 . The configurations of the second sliding device  16  and the second driver  17  are substantially the same as those of the first sliding device  12  and the first driver  13  respectively. The second air tachometer  18  is positioned adjacent to the second air outlet  331 , and is used for measuring the airflow speed of the second air outlet  331 . 
         [0021]    The configuration of the third shielding plate  19  is substantially the same as that of the first shielding plate  11 , and the third shielding plate  19  slidably covers the third air outlet  341  to change an opening size of the third air outlet  341 . The configurations of the third sliding device  20  and the third driver  21  are substantially the same as those of the first sliding device  12  and the first driver  13  respectively. The third air tachometer  22  is positioned adjacent to the third air outlet  341 , and is used for measuring the airflow speed of the third air outlet  341 . 
         [0022]    The controller  23  is electrically connected to the four fans  10 , the first driver  13 , the first air tachometer  14 , the second driver  17 , the second air tachometer  18 , the third driver  21 , the third air tachometer  22 , and is used for comparing a first threshold value with an airflow speed of the first air outlet  321 , comparing a second threshold value with an airflow speed of the second air outlet  331 , and comparing a third threshold value with an airflow speed of the third air outlet  341 . 
         [0023]    The airflow speeds of the air outlets  321 ,  331 ,  341  will change when the number of the electronic components changes. The electronic components  500  can block the flow of the air in the casing  300 , therefore, when the number of the electronic components  500  increases, the airflow speeds of the air outlets  321 ,  331 ,  341  reduce; when the number of the electronic components  500  decreases, the airflow speeds of the air outlets  321 ,  331 ,  341  increases. 
         [0024]    When the airflow speed detected by the first air tachometer  14  is less than the first threshold value, the controller  23  controls the first driver  13  to drive the first shielding plate  11  to slide to increase the opening size of the first air outlet  321 . When the airflow speed detected by the second air tachometer  18  is less than the second threshold value, the controller  23  controls the second driver  17  to drive the second shielding plate  15  to slide to increase the opening size of the second air outlet  331 . When the airflow speed detected by the third air tachometer  22  is less than the third threshold value, the controller  23  controls the third driver  21  to drive the third shielding plate  19  to slide to increase the opening size of the third air outlet  341 . 
         [0025]    When all of the airflow speeds detected by the first air tachometer  14 , the second air tachometer  18 , and the third air tachometer  22  are respectively larger than the first threshold value, the second threshold value and the third threshold value, the controller  23  reduces the rotating speeds of the fans  10 . When all of the airflow speeds detected by the first air tachometer  14 , the second air tachometer  18 , and the third air tachometer  22  are respectively less than the first threshold value, the second threshold value and the third threshold value, the controller  23  increases the rotating speeds of the fans  10 . 
         [0026]    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 disclosure or sacrificing all of its material advantages, the examples hereinbefore described merely being exemplary embodiments of the present disclosure.