BRIEF DESCRIPTION OF THE DRAWINGS
The features of the invention believed to be novel are set forth with particularity in the appended claims. The invention itself however may be best understood by reference to the following detailed description of the invention, which describes certain exemplary embodiments of the invention, taken in conjunction with the accompanying drawings in which:
FIG. 1 is an exploded perspective view showing the structure of the present invention;
FIGS. 2A and 2B are partially enlarged views showing the assembled cover of the present invention;
FIG. 3 shows a perspective view of the present invention;
FIG. 4 is a schematic view showing the operation of the present invention; and
FIG. 5 is a schematic view showing the direction of the airflow generated by the heat-dissipating fan of the present invention
DETAILED DESCRIPTION OF THE INVENTION
With reference to FIG. 1, it is an exploded perspective view showing the structure of the present invention. It can be seen from the drawing that the heat-dissipating fan of the present invention mainly comprises a base 1, a blade assembly 3, an outer casing 5 and a cover 7. The base 1 is provided with an accommodating trough 12 for mounting the blade assembly 3. The periphery of the base 1 is formed into a curved shape. The front end of the base 1 is provided with an opening 13. The periphery of the base 1 is provided with a plurality of connecting holes 14. The bottom of the base 1 has a bottom plate 15. The center of the bottom plate 15 is provided with a positioning pillar 16 for connecting to the blade assembly 3. Leads are provided in the positioning pillar and electrically connected to the blade assembly 3, which is conventional and thus the description thereof is omitted. The surface of the bottom plate 15 is circumferentially provided with annular first intakes 151 (three shown in the drawing) surrounding the positioning pillar 16. The side of each first intake 151 is provided with at least one engaging end 152 (three shown in the drawing). The engaging end 152 comprises a notch 601 and a slice body 602. The slice body 602 is further provided with at least one protruding block 603 thereon, as shown in the partially enlarged view of FIG. 2A. With reference to FIG. 1 again, the blade assembly 3 is constituted of a plurality of blades 31. The center of the blade assembly 3 has an accommodating hole 32 with coils provided therein for the blade assembly 3. Also, the accommodating hole is connected to the positioning pillar 16, which is also conventional and thus the description thereof is omitted. Also, the outer casing 5 is provided above the base 1. The shape of the outer casing 5 corresponds to that of the base 1. Further, the periphery of the outer casing 5 is provided with a plurality of locking holes 51 corresponding to the connecting holes 14 of the base 1. With fastening elements (such as screws shown in the drawing) are used to fix the connecting holes and the corresponding locking holes. Therefore, when the outer casing 1 is connected with the base 1, the blade assembly 3 can be enclosed within the base 1. In addition, as shown in FIG. 3, the opening 13 of the base 1 also forms an essential air-guiding port. Further, the center of the outer casing 5 is provided with a circular second intake 52. Finally, the cover 7 is formed into a circular shape. The center of the cover has a through hole 71. The cover is provided under the base 1 and connected to the bottom plate 15 of the base 1, thereby to close the first intake 151. On the cover 7, at least one locking piece 72 (three sets shown in the drawing) is provided to correspond to the positions of the engaging end 152. The locking piece 72 is formed into an inverted-L shape for locking with the engaging end 152. Further, on the cover 7, a plurality of protruding strips 73 are provided to correspond to the inside and outside of the first intake 151. As shown in FIGS. 2A and 2B, after the cover 7 is disposed under the base 1, the protruding strips 73 are disposed at proper positions corresponding to the cover 7 and the locking pieces 72 penetrate into the notch 601 of the engaging ends 152. With the rotation of the protruding strip along the inside and outside of the first intake 151, the locking piece 72 and the slice body 602 are engaged with each other. With the upwardly pushing force of the protruding block 603 of the slice body, the position of the cover can be fixed.
With reference to FIG. 4, it is a schematic view showing the operation of the present invention. As shown in the drawing, when two interface cards 9a and 9b are juxtaposed and inserted onto the main board 10, a heat-dissipating fan is mounted on the respective interface card. The opening 13 of the base 1 is connected with an elongated air covering 20a, 20b. The fastening elements 8 are used to combine the board body of the interface card 9a, 9b with the air covering 20a, 20b, so that the electronic elements on each interface card 9a, 9b can be all covered in the air covering 20a, 20b. Further, on the first intake 151a, 151b (not shown) under the accommodating trough 12a, 12b of the heat-dissipating fan, the cover 7a, 7b is connected to the base by locking the locking piece 72a, 72b with the engaging end 152a, 152b to close the first intake 151a, 151b. Therefore, during the operation of the heat-dissipating fan, each blade assembly 3a, 3b extracts air via the second intake 52a, 52b, as shown in FIG. 5. Also, with the rotation of each blade assembly 3a, 3b, the airflow can be guided out via the opening 13 and flow into the elongated air covering 20a, 20b. The airflow can heat-exchange with the heat generated by the operation of the electronic elements. Finally, the airflow is guided out via the opening on the other end of the air covering 20a, 20b. In this way, the first intake 151b of two adjacent heat-dissipating fans can be closed by the cover 7b. Therefore, in prior art, two adjacent heat-dissipating fans use the adjacent first intake 151b and second intake 52a to extract air, which causes the interference in the air-extracting action and reduces the amount of airflow. Such problem is eliminated by the present invention. As a result, in the present invention, the air can be extracted into the heat-dissipating fan via the other intake, thereby to keep the heat-dissipating effect of the heat-dissipating fan.
Although the present invention has been described with reference to the foregoing preferred embodiment, it will be understood that the invention is not limited to the details thereof. Various equivalent variations and modifications can still be occurred to those skilled in this art in view of the teachings of the present invention. Thus, all such variations and equivalent modifications are also embraced within the scope of the invention as defined in the appended claims.
Patent Application
20070280818
