Abstract:
An air duct device includes a first air duct, and a second air duct slidably fitting about the first duct. The first air duct axially defines a first passage and defines a row of latching slots along an extending direction of the first passage. The second air axially defines a second passage. A latching hook is formed on the second air duct to be selectively latched to one of the latching slots.

Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The present disclosure relates to an air duct device that can dissipate heat in a device. 
         [0003]    2. Description of Related Art 
         [0004]    Electronic devices, such as computers, use heat dissipation assemblies for dissipating heat generated by components therein, thus preventing the components from becoming overheated. An air duct device is often used in a computer with a fan to assist in heat dissipation by guiding airflow. However, different sizes of electronic devices need different sizes of air duct devices, creating a need for a flexible air duct device. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0005]    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, all the views are schematic, and like reference numerals designate corresponding parts throughout the several views. 
           [0006]      FIG. 1  is an exploded, isometric view of an exemplary embodiment of an air duct device, together with a cooling member. 
           [0007]      FIG. 2  is an inverted view of  FIG. 1 . 
           [0008]      FIG. 3  is an assembled, isometric view of  FIG. 1 . 
           [0009]      FIGS. 4 to 5  are cross-sectional views of  FIG. 3 , showing different states of use of the air duct device. 
       
    
    
     DETAILED DESCRIPTION 
       [0010]    The present disclosure, including the accompanying drawings, is illustrated by way of examples and not by way of limitation. It should be noted that references to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and such references mean at least one. 
         [0011]    Referring to  FIGS. 1 and 2 , an exemplary embodiment of an air duct device is provided to conduct airflow for a cooling member  10  mounted in an electronic device (not shown). The air duct device includes a first air duct  30  and a second air duct  40 . 
         [0012]    The cooling member  10  includes a fan  12  and a heat sink  14 . The fan  12  includes a first frame  122  and a second frame  124  opposite to the first frame  122 . Four substantially triangular tabs  126  respectively extend from four corners of each of the first and second frames  122  and  124 . A plurality of fasteners, such as screws, extends through the tabs  126  of the first frame  122  and engages with the heat sink  14  to fasten the fan  12  to a first end of the heat sink  14 . A mounting seat  18  fastened to a second end of the heat sink  14  opposite to the first end, is provided to fasten the cooling member  10  in the electronic device. 
         [0013]    The first air duct  30  includes a substantially cylinder-shaped first main body  32 . The first main body  32  defines a passage  33  along an axis of the first main body  32 . The first main body  32  further defines two slide slots  320  opposite to each other and two rows of latching slots  324  opposite to each other along the axis of the main body  32  in a sidewall of the first main body  32 . Four substantially triangular tabs  34  equidistantly extend from a first end of the sidewall of the first main body  32 . A hook  36  extends down from each of the tabs  34 . 
         [0014]    The second air duct  40  includes a substantially cylinder-shaped second main body  42 . The second main body  42  defines a passage  43  along an axis of the second main body  42 . A trumpet-shaped flange  44  slantingly extends up from a first end of the second main body  42  for increasing airflow of the passage  43 . The second main body  42  further equidistantly defines four substantially U-shaped through slots  420  in a sidewall of the second main body  42 . Two elastic latching hooks  424  opposite to each other are surrounded by two opposite through slots  420  of the four through slots  420 . The latching hooks  424  direct to a second end of the second main body  42  opposite to the first end. Two elastic guiding blocks  426  opposite to each other are surrounded by the other two opposite through slots  420 . The guiding blocks  426  direct to the first end of the second main body  42 . 
         [0015]    Referring to  FIGS. 3 to 5 , in assembly, the second main body  42  of the second air duct  40  is fit about the first main body  32  of the first air duct  30  through the passage  43 . An outer surface of the sidewall of the first main body  32  resists against an inner surface of the sidewall of the second main body  42 . The guiding blocks  426  of the second air duct  40  are slidably engaged in the corresponding slide slots  320  of the first air duct  30 , to make the second air duct  40  capable of sliding relative to the first air duct  30  along the slide slots  320 . The latching hooks  424  are latched to two corresponding opposite latching slots  324 , to fasten the second air duct  40  to the first air duct  30 . The tabs  34  of the first air duct  30  resist against the tabs  126  of the second frame  124  of the fan  12 . The hooks  36  of the first air duct  30  are latched to bottoms of the tabs  126  of the second frame  124  to fasten the first air duct  30  to the fan  12 . 
         [0016]    In use, the latching hooks  424  are selectively latched to different two corresponding opposite latching slots  324  to adjust a length of the first air duct  30  exposed from the second air duct  40 , thereby changing the size of the air duct device, making it a universal duct system adaptable to many different size electronic devices. 
         [0017]    In other embodiments, each tab  34  of the first air duct  30  defines a through hole, and correspondingly each tab  126  of the second frame  124  defines a fastening hole. A plurality of fasteners, such as screws, extends through the through holes of the first air duct  30  and engages in the fastening holes of the second frame  124  to fasten the first air duct  30  to the fan  12 . 
         [0018]    It is to be understood, however, that even though numerous characteristics and advantages of the embodiments have been set forth in the foregoing description, together with details of the structure and function of the embodiments, the present disclosure is illustrative only, and changes may be made in details, especially in matters of shape, size, and arrangement of parts within the principles of the embodiments to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.