Abstract:
A cover structure for an outdoor casing includes a top cover and an inner cover-brow. A side wall is formed on the periphery of the top cover. The inner cover-brow has a first brow plate and a second brow plate. An inclined plate interconnects the first brow plate and the second brow plate. The inclined plate has a plurality of through holes. The second brow plate is connected to the side wall. The interior included angle of the first brow plate and the inclined plate is an acute angle. The cover structure not only helps the outdoor casing to ventilate and dissipate heat, but also enhances the outdoor casing&#39;s water repellency.

Description:
BACKGROUND 
     1. Technical Field 
     The present invention generally relates to a casing structure, and more particularly, to a cover structure for an outdoor casing. 
     2. Related Art 
     The need to install large electronic apparatuses outdoors has been rising gradually in this information era. These electronic apparatuses must be put inside outdoor casings to avoid deterioration caused by the sunlight and the rain. Nowadays the most frequently seen outdoor casings are outdoor telecommunication casings. Outdoor telecommunication casings are used when the machine room of a telecommunication company and the users&#39; equipment are too far apart. These casings can be connected to the machine room and the users&#39; equipment through optical fiber, cable, or other communication lines. The electronic apparatuses in these casings can repeat or amplify the attenuated signal so as to ensure the user&#39;s communication quality. 
     As shown in  FIG. 1  and  FIG. 2 , a conventional outdoor telecommunication casing  10  has a containing space  20  in its interior for communication equipment to be installed therein. A convex part  30  extends from the top periphery of the casing  10 . The bottom periphery of the convex part  30  has some air vents  301  that are connected to the containing space  20 . The casing  10  further has a fan  40  above the containing space  20 . The fan  40  can guide external air into the containing space  20 , causing the incoming air to absorb heat from the electronic apparatus inside the casing  10 , and then bring the heat out through the air vents  301 . This process can dissipate the heat accumulated in the casing  10 , and stabilize the operation of the electronic apparatus inside the casing  10 . 
     However, the outdoor telecommunication casing  10  is not good at repelling water. If there is a storm, the horizontal arrangement at the bottom rim of the convex part  30  will gather some rain. Strong wind will blow the accumulated water into the air vents  301  and then into the top of the casing  10 . The water will flow into the containing space  20  through the fan  40  or other gaps. The water will make the containing space  20  moist, and even will cause the communication apparatus to malfunction. Even if the water enters the containing space  20  is not much, some components may still be damaged. If a lot of water enters the containing space  20 , then the communication apparatus may be soaked in the water and breakdown as a whole. 
     BRIEF SUMMARY 
     An embodiment of the present invention provides a cover structure for an outdoor casing. With an inner cover-brow having an inclined plate that has a plurality of through holes, the outdoor casing can not only facilitate air circulation and heat dissipation, but also provide good water repellency. 
     An embodiment of the present invention provides a cover structure for an outdoor casing. The cover structure has a top cover and an inner cover-brow. A side wall is formed on the periphery of the top cover. The inner cover-brow has a first brow plate and a second brow plate. An inclined plate interconnects the first brow plate and the second brow plate. The inclined plate has a plurality of through holes. The second brow plate is connected to the side wall. The interior included angle between the first brow plate and the inclined plate is an acute angle. 
     An embodiment of the present invention provides a cover structure for an outdoor casing. The cover structure includes a top cover and an inner cover-brow. A side wall is formed on the periphery of the top cover. The inner cover-brow has a first brow plate and an inclined plate extending from an end of the first brow plate. The inclined plate has a plurality of through holes. The inclined plate is connected to the side wall. The interior included angle between the first brow plate and the inclined plate is an acute angle. 
     The embodiments of the present invention allow external air to be guided into the outdoor casing, take away the heat generated by the large electronic apparatus inside the outdoor casing, and exit through the through holes. As a result, the interior of the outdoor casing will not be too hot to cause the large electronic apparatus to malfunction. Furthermore, the embodiments adopt the concept of a common passageway for both wind and water, use the boundary layer flow to control the flow path, and achieve good water repellency. In addition, the cover structure has some other designs for improving the water repellency. These designs can prevent water drops from flowing in along the lower cover or being blown in along the ceiling. As a result, the cover structure has superior water repellency. 
     It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  illustrates a conventional outdoor telecommunication casing in a sectional view; 
         FIG. 2  illustrates the air vents of the conventional outdoor telecommunication casing; 
         FIG. 3  illustrates a cover structure in combination according to an embodiment of the present invention; 
         FIG. 4  illustrates the cover structure in a sectional view; 
         FIG. 5  illustrates the cover structure in use; 
         FIG. 6  illustrates another in-use status of the cover structure; and 
         FIG. 7  illustrates a cover structure in a sectional view according to another embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     Please refer to  FIG. 3  and  FIG. 4 , which illustrate a cover structure for an outdoor casing according to an embodiment of the present invention. In this embodiment, the cover structure is connected to the top of the outdoor casing  100 , which is equipped with a wind-guiding fan  200 . The cover structure mainly includes a top cover  1  and an inner cover-brow  2 . 
     In this embodiment, the top cover  1  has a ceiling  11 . The top cover  1  further has a side wall  12  extending downwards from the periphery of the ceiling  11 . Viewing from the side wall  12 , the ceiling  11  is an upward slope  111 . 
     The inner cover-brow  2  has a first brow plate  21  and a second brow plate  22 . An inclined plate  23  interconnects the first brow plate  21  and the second brow plate  22 . The inclined plate  23  inclines downwards from the first brow plate  21  to the second brow plate  22 . The inclined plate  23  has a plurality of through holes  231 . The second brow plate  22  is connected to the side wall  12 . The interior included angle between the first brow plate  21  and the inclined plate  23  is an acute angle θ. 
     The embodiment further includes a lower cover  3 . The lower cover  3  and the top cover  1  are combined corresponding to each other. The lower cover  3  is connected to the top of the outdoor casing  100 . The lower cover  3  has a hollow lid body  31  extending towards the top cover  1 . The hollow lid body  31  correspondingly covers the wind-guiding fan  200 . 
     The embodiment further includes a water barrier stripe  4 . The water barrier stripe  4  is installed on the ceiling  11 . The ceiling  11  forms a slope  111  from the side wall  12  to the water barrier stripe  4 . 
     In the combination of the cover structure, the lower cover  3  is connected to the top of the outdoor casing  100 . The lower cover  3  and the top cover  1  are combined corresponding to each other. The inner cover-brow  2  has the first brow plate  21  and the second brow plate  22 . The second brow plate  22  is connected to the side wall  12 . The inclined plate  23  is connected between the first brow plate  21  and the second brow plate  22 . The inclined plate  23  has the plurality of through holes  231 . Furthermore, the lower cover  3  has the hollow lid body  31  that extends towards the top cover  1  and correspondingly covers the wind-guiding fan  200 . The ceiling  11  is installed with the water barrier stripe  4 . The ceiling  11  forms the slope  111  between the side wall  12  and the water barrier stripe  4 . In another embodiment, the first brow plate  21  and the side wall  12  are parallel; the acute angle θ between the first brow plate  21  and the inclined plate  23  is between 10 degrees and 80 degrees. 
     Please refer to  FIG. 5 , which illustrates the cover structure in use. The wind-guiding fan  200  guides the airflow A to the area between the top cover  1  and the lower cover  3 , and guides external air into the outdoor casing  100 . The incoming air takes away heat from the large electronic apparatus inside the outdoor casing  100 , and brings the heat out via the through holes  231 . This process dissipates heat away from the interior of the outdoor casing  100  and stabilizes the operation of the large electronic apparatus inside the outdoor casing  100 . 
     Please refer to  FIG. 6 , which illustrates another in-use status of the cover structure. The inclined plate  23  lies between the first brow plate  21  and the second brow plate  22 . The interior included angle between the first brow plate  21  and the inclined plate  23  is an acute angle θ. When in bad weather, rain frequently will accumulate on the end of the second brow plate  22  but will not flow reversely towards the inclined plate  23 . When rain drops come along with strong wind, the second brow plate  22  will block out the rain drops and prevent them from entering into the inclined plate  23 . A part of the rain drops W that come along with wind can only splash into each of the through holes  231  along the direction of the first brow plate  21 . At this moment, the water drops W that come along with wind will be blown into the top cover  1  along the side wall  12 . Because air and the water drops W have different frictions against the slope  111  and the side wall  12 , moisture will be dried down through draining. Although wind will enter the top cover  1 , the water drops W will remain on the slope  111  and the side wall  12 . Eventually, the water drops W will flow out from the through holes  231 . The embodiment adopts the concept of a common passageway for both wind and water, uses the boundary layer flow to control the flow path, and achieves a good water repelling effect. As a result, the embodiment prevents the interior of the outdoor casing  100  from becoming moist, and hence prevents excessive moisture from negatively affecting the operation of the electronic apparatus inside the casing  100 . The embodiment also prevents water drops from contacting and damaging some electronic components inside the outdoor casing  100 . Furthermore, the embodiment prevents water from ponding in the outdoor casing  100  and destroying the large electronic apparatus as a whole. 
     The cover structure further has the following structure design. The lower cover  3  has the hollow lid body  31  that extends towards the top cover  1 . The hollow lid body  31  correspondingly covers the wind-guiding fan  200 . The ceiling  11  is installed with the water barrier stripe  4 . The ceiling  11  forms the slope  111  from the side wall  12  to the water barrier stripe  4 . In this structure design, the slope  111  can prevent the water drops W from flowing reversely and entering into the top cover  1 . But if the wind is too strong, the water drops W that come with the wind can still be blown into the top cover  1  along the ceiling  11 . If this happens, the water barrier stripe  4  will block the water drops W, causing them to drop onto the lower cover  3 . Furthermore, because the opening of the hollow lid body  31  is higher than the lower cover  3 , the water drops W will not enter the interior of the outdoor casing  100 . The water drops W will accumulates on the lower cover  3  and flow out through the scuppers on the lower cover  3 . 
       FIG. 7  shows another embodiment of the cover structure of the present invention. In this embodiment, the inner cover-brow  2  has a first brow plate  21  and an inclined plate  23  that extends downwards from an end of the first brow plate  21 . The inclined plate  23  has a plurality of through holes  231 . An end of the inclined plate  23  is connected to the side wall  12 . The interior included angle between the first brow plate  21  and the inclined plate  23  is an acute angle θ. Because of this design, most of the rain drops that come with wind can only be splashed into each of the through holes  231  along the direction of the first brow plate  21 . Because air and the rain drops have different frictions against the slope  111  and the side wall  12 , moisture will be dried down through draining. Therefore, this design can effectively repel water and prevent the large electronic apparatus inside the outdoor casing  100  from malfunction or breakdown. 
     The above description is given by way of example, and not limitation. Given the above disclosure, one skilled in the art could devise variations that are within the scope and spirit of the invention disclosed herein, including configurations ways of the recessed portions and materials and/or designs of the attaching structures. Further, the various features of the embodiments disclosed herein can be used alone, or in varying combinations with each other and are not intended to be limited to the specific combination described herein. Thus, the scope of the claims is not to be limited by the illustrated embodiments.