Patent Publication Number: US-2005129513-A1

Title: Heat dissipation apparatus

Description:
BACKGROUND OF THE INVENTION  
      The present invention relates to a heat dissipation apparatus, and more particular, to a heat dissipation apparatus including two sets of fans installed within a single enclosure. Therefore, an enhanced dissipation effect is resulted because the speed and pressure generated by rotation of the fan can be adjusted according to specific requirement, while the assembly convenience is improved.  
      To enhance overall wind speed and pressure, two heat dissipation fans  2 A and  2 A′ are typically combined or stacked in series as shown in  FIG. 1 . Thereby, the damage of the system caused interruption of any of the fans can be avoided. However, to assemble the fans  2 A and  2 A′ together, fasteners such as screws have to be applied to the frames of the fans  2 A and  2 A′.  
      When the fans  2 A and  2 A′ are secured to each other in series, increase in wind pressure is not significant because the frames of the fans  2 A and  2 A′ normally include ribs  21 A for reinforcing stability of the attachment. When the first fan  2 A rotates to generate an air flow, the air flow is easily interrupted by the ribs  21 A to cause turbulence. When the turbulence is circulating into the fan  2 A′, the wind speed and pressure generated by the fan  2 A′ is seriously affected. Even when the fan  2 A′ remains stationary when the fan  2 A rotates, the wind pressure will be lowered by the installation of the fan  2 A′. The serial connection of the fans  2 A and  2 A′ results in significant resistance, which degrades rotation efficiency and increases the noise.  
     BRIEF SUMMARY OF THE INVENTION  
      The present invention provides a heat dissipation apparatus which integrates two sets of fans into a single enclosure, such that assembly convenience is greatly improved, while the heat dissipation efficiency is enhanced.  
      The heat dissipation apparatus provided by the present invention is operative to adjust the wind speed and pressure of the air flow generated by the sets of fans.  
      The heat dissipation apparatus comprises an enclosure in which a fan seat is laterally disposed. The fan seat divides an interior space of the enclosure into two chambers. The heat dissipation apparatus further comprises a shaft extending through a center of the fan seat across both the chambers. In each of the chambers, a set of fan is installed about the shaft. Each set of fans includes a coil set, a magnetic device and a set of blades.  
      The fan seat includes at least one stationary guiding blade to guide the air flow from one set of fan into the other. Therefore, the turbulence caused by the air flow generated by the other set of fan is prevented. The wind speed and pressure can thus be adjusted as required.  
      These and other objectives of the present invention will become obvious to those of ordinary skill in the art after reading the following detailed description of preferred embodiments.  
      It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the invention as claimed 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
      These, as well as other features of the present invention, will become apparent upon reference to the drawings wherein:  
       FIG. 1  shows a perspective view of a conventional fan assembly;  
       FIG. 2  shows an exploded view of a heat dissipation apparatus provided by the present invention;  
       FIG. 3  shows a perspective view of the heat dissipation apparatus; and  
       FIG. 4  shows a cross sectional view of the heat dissipation apparatus. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION  
      Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.  
      The present invention provides a heat dissipation apparatus  10  as shown in  FIG. 2 . The heat dissipation apparatus  10  includes an enclosure or housing  1 , in which a lateral fan seat  12  (as shown in  FIG. 4 ) is integrally formed. The fan seat  12  divides an interior space of the enclosure  10  into an upper chamber  13  and a lower chamber  14  to accommodate two sets of fans  2  and  2 ′ therein, respectively. As shown, the fan seat  12  includes a substantially circular dish and at least one guiding blades  121  (stationary blade) extending radially from a is periphery of the body dish. The heat dissipation apparatus  10  further comprises a shaft  15  extending through a center of the fan seat  12  into both the upper chamber  13  and the lower chamber  14 .  
      The upper and lower chambers  13  and  14  comprise fans  21  and  21 ′ in mechanical communication with the shaft  15 , respectively. The fans  21  and  21 ′ comprise hubs  211  and  211 ′ about the shaft  15 , hollow bushings  212  and  212 ′ between the shaft  15  and the hubs  211  and  211 ′, respectively, blades extending radially from an external periphery of the hubs  211  and  211 ′. The fans  21  and  21 ′ are mounted to the shaft  15  by means of ball bearings  22  and  22 ′, C-rings  23  and  23 ′, and springs  24  and  24 ′. Each of fan sets  2  and  2 ′ further comprises a coil set  25 ,  25 ′, respectively, and magnetic strips  26 ,  26 ′ and magnetic frames  27 ,  27 ′ between the hubs  21 ,  21 ′ and the coil sets  25 ,  25 ′.  
      Referring to  FIGS. 2 and 4 , during assembly, the coil sets  25 ,  25 ′, magnetic strips  26 ,  26 ′ and magnetic frames  27 ,  27 ′ are installed in the hubs  211  and  211 ′ of the fans  21 ,  21  ′, respectively. The bushings  212  and  212 ′ are then inserted through the hubs  21  and  21 ′, respectively. The fans  2  and  2 ′ are then mounted to two sides of the fan seat  12 , and the while fan assembly is then disposed in the enclosure  1 . To secure the fans  2  and  2 ′ to two sides of the fan seat  12 , the through holes of the bushings  212  and  212 ′ are aligned with the shaft  15  at two sides of the fan seat  12 . Once the shaft  15  is inserted into the hubs  212  and  212 ′, the C-rings  23  and  23 ′ and the springs  24  and  24 ′ are engaged with the shaft  15 . Thereby, a heat dissipation apparatus with two fan sets  2  and  2 ′ is obtained as shown in  FIG. 3 .  
      In the present invention, the integrally fan laterally disposed in the enclosure divides the interior space of the enclosure into two chambers, such that two fan sets can be installed in a single enclosure. The guiding blades  121  extending from the central circular dish of the fan seat guides the air flow generated by one of the fan sets  2  and  2 ′ into the other without causing turbulence. Therefore, the wind speed and pressure of the air flow can be adjusted as required.  
      This disclosure provides exemplary embodiments of the present invention. The scope of this disclosure is not limited by these exemplary embodiments. Numerous variations, whether explicitly provided for by the specification or implied by the specification, such as variations in shape, structure, dimension, type of material or manufacturing process may be implemented by one of skill in the art in view of this disclosure.