Abstract:
An electronic device includes a chassis, a group of fans, and an air conducting cover. The air conducting cover defines a number of air entrances, and the fans respectively facing the corresponding air entrance. Each entrance including two opposite flaps. Air flow enters the air entrances. When air flow reversely passes through the air entrances, the air flow closes the flaps.

Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The disclosure generally relates to air conducting covers, particularly to an air conducting cover which can effectively prevent air from flowing back into the electronic devices. 
         [0003]    2. Description of Related Art 
         [0004]    Many electronic components in an electronic device generate heat when operating. In designing an electronic device, cooling systems are used to dissipate heat generated by the electronic components to prevent the electronic components from overheating. 
         [0005]    Many cooling systems include a group of fans and an air conducting cover. The air conducting cover is positioned above the electronic components most likely to become hot. The fans are positioned on corresponding air entrances of the air conducting cover to force airflow to enter the air conducting cover and pass through the electronic components for heat dissipation. However, when one of the fans stops working, the airflow in the air conducting cover will usually generate a return/back airflow, and go out of the air entrance corresponding to the stopping fan. Thus, the airflow of the fans is easily lost, and decreases the dissipating effects. 
         [0006]    Therefore, there is room for improvement within the art. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0007]    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 exemplary air conducting cover for electronic device. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views. Wherever possible, the same reference numbers are used throughout the drawings to refer to the same or like elements of an embodiment. 
           [0008]      FIG. 1  is a schematic view of an embodiment of an electronic device including an air conducting cover. 
           [0009]      FIG. 2  is a schematic view of the air conducting cover in  FIG. 1  in a use state when the fans are normal. 
           [0010]      FIG. 3  is a schematic view of the air conducting cover in  FIG. 1  in a use state when the second fan stops. 
           [0011]      FIG. 4  is a schematic view of the air conducting cover in  FIG. 1  in a use state when the third and fifth fans stop. 
       
    
    
     DETAILED DESCRIPTION 
       [0012]    Referring to  FIGS. 1 and 2 , an electronic device  100  includes a chassis  10 , a motherboard  20 , a first electronic component  27 , a second electronic component  28 , a first group of fans  30 , a second group of fans  35 , and an air conducting cover  40 . 
         [0013]    The chassis  10  includes a base plate  11 , two opposite sidewalls  12 , and two opposite end walls  13  connecting the sidewalls  12 . The sidewalls  12  and the ends walls  13  are substantially perpendicularly connected to edges of the base plate  11 . The motherboard  20  is mounted on the base plate  11 . In the exemplary embodiment, the first electronic component  27  and the second electronic component  28  are central processing units (CPUs) mounted on the motherboard  20 . 
         [0014]    The first group of fans  30  is made of three fans  31 ,  32 ,  33 , and the second group of fans  35  is made of three fans  36 ,  37 ,  38 . The fans  31  to  38  are arranged along a line. 
         [0015]    The air conducting cover  40  is positioned above the motherboard  20  for covering the first electronic component  27  and the second electronic component  28 . The air conducting cover  40  includes a middle partition  41  and an end plate  42 . The middle partition  41  divides the air conducting cover  40  to a first space  410  and a second space.  420 . The first group of fans  30  is configured for dissipating heat in the first space  410 , and the second group of fans  35  is configured for dissipating heat in the second space  420 . 
         [0016]    The end plate  42  is substantially parallel to one of the sidewalls  12 . The end plate  42  defines six air entrances  43 . The fans  31  to  38  are positioned between the end wall  42  and the sidewall  12 . Each fan faces a corresponding air entrance  43 . Each air entrance  43  has two opposite flaps  44  formed on the end plate  42 . The flaps  44  are integrally formed with the air conducting cover  40 . Two adjacent air entrances  43  have a common flap  44 . In the exemplary embodiment, there are seven flaps  44 . Each flap  44  is made of metal or plastics, and is flexibly connected to the air conducting cover  40  for swing/rotating toward left sides or right side relative to the end plate. In the exemplary embodiment, when airflow returns in one air entrance  43 , the return airflow can swing/rotate the corresponding flaps  42  to close the corresponding air entrance  43 . A width of each flap  44  is substantially half of the diameter of the air entrance  43 . In the exemplary embodiment, the flaps  44  positioned at a brim are angled toward the corresponding air entrance  43  relative to the end plate  42 . The other flaps  44  are substantially perpendicular to the end plate  42 . 
         [0017]    In use, referring to  FIG. 3 , when all of the fans  31  to  38  work at a normal state, the airflows from the fans  31  to  38  enter the air conducing cover  40  from the air entrances  43  for dissipating heat. Referring to  FIG. 3 , when the fan  32  of the first group of fans  30  stops working, return airflow will force the flaps  44  to rotate/swing for closing the corresponding air entrance  43  to prevent the return airflow from exiting through the entrance  43 . Referring to  FIG. 4 , when the fan  33  of the first group of fans  30  and the fan  37  of the second group of fans  35  stop working, return air flow will rotate the flaps  44  to close the two corresponding air entrances  43 . The flaps  44  effectively prevent airflow from returning to electronic devices. Thus, the airflow of the fans is not easily lost from the stopped fans, and thus secures a stable dissipating heat. 
         [0018]    It is to be understood, however, that even through numerous characteristics and advantages of the disclosure have been set forth in the foregoing description, together with details of the system and function of the disclosure, the disclosure is illustrative only, and changes may be made in detail, especially in the matters of shape, size, and arrangement of parts within the principles of the disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.