Patent Publication Number: US-2013251521-A1

Title: Diffusion Type Fan Device

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a fan and, more particularly, to a fan device that functions as a ceiling fan or an electric fan. 
     2. Description of the Related Art 
     A conventional fan device  1  in accordance with the prior art shown in  FIG. 1  comprises a plurality of blades  12  and a driving device  11  connected with the blades  12  to drive and rotate the blades  12 . Thus, the blades  12  are rotated by the driving device  11  to introduce an air flow so as to provide an air ventilating effect to a room, thereby providing a comfortable sensation to the user. However, when the blades  12  are rotated, the air flow introduced by rotation of the blades  12  is directed toward a determined direction, such as in the horizontal direction, and cannot blow in different directions, thereby greatly limiting the air ventilating effect. 
     BRIEF SUMMARY OF THE INVENTION 
     In accordance with the present invention, there is provided a fan device, comprising a primary blade unit, and a guiding member connected with the primary blade unit. The primary blade unit includes a mounting seat having a first side provided with a plurality of flow channels, a primary blade rotatably mounted in the mounting seat and having a periphery provided with a plurality of ventilating holes that are movable to align with the flow channels of the mounting seat respectively, and a driving mechanism mounted on the mounting seat to drive and rotate the primary blade. The driving mechanism of the primary blade unit is located between the mounting seat and the guiding member. The guiding member is located outside of the mounting seat of the primary blade unit and has a periphery provided with a plurality of flow guiding ducts aligning with the flow channels of the mounting seat respectively. The guiding member has an outer side provided with a flow guiding surface. 
     The fan device further comprises a secondary blade unit connected with the primary blade unit. The secondary blade unit includes a plurality of mounting plates connected with the mounting seat of the primary blade unit, and an end cap connected with the mounting plates. Each of the mounting plates of the secondary blade unit has a surface provided with a vent hole for mounting a plurality of secondary blades. Each of the secondary blades is pivotally mounted in the vent hole. The secondary blade unit further includes a plurality of adjusting members each movably mounted on a respective one of the mounting plates and each pivotally connected with the secondary blades on the respective mounting plate to drive and pivot the secondary blades relative to the respective mounting plate. 
     The primary objective of the present invention is to provide a diffusion type fan device that can guide an air flow in different directions so as to diffuse and expand the traveling path and angle of the air flow. 
     According to the primary advantage of the present invention, when the ambient air flow is introduced into the fan device, the primary blade unit and the secondary blade unit guide and inject the air flow outward in two different directions simultaneously to diffuse and spread the air flow largely and to increase the air circulation, thereby greatly enhancing the air ventilating and circulating effect. 
     According to another advantage of the present invention, the fan device has a better air ventilating and circulating effect so as to reduce the number of fans that are necessary in a determined space, thereby decreasing the cost. 
     According to a further advantage of the present invention, the air flow is guided through the flow guiding ducts of the guiding member, the flow channels of the mounting seat and the ventilating holes of the primary blade into the mounting seat of the primary blade unit so that the air flow is circulated smoothly and quickly. 
     According to a further advantage of the present invention, the secondary blades are pivoted in the vent hole to change the inclined angle of each of the secondary blades so as to adjust the air output from the vent hole of each of the mounting plates. 
     Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING(S) 
         FIG. 1  is a perspective view of a conventional fan device in accordance with the prior art. 
         FIG. 2  is a perspective view of a fan device in accordance with the preferred embodiment of the present invention. 
         FIG. 3  is a perspective cross-sectional view of the fan device as shown in  FIG. 2 . 
         FIG. 4  is an exploded perspective view of the fan device as shown in  FIG. 2 . 
         FIG. 5  is a front cross-sectional view of the fan device as shown in  FIG. 2 . 
         FIG. 6  is a schematic operational view of the fan device as shown in  FIG. 5 . 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring to the drawings and initially to  FIGS. 2-5 , a fan device in accordance with the preferred embodiment of the present invention comprises a primary blade unit  3 , a guiding member  2  connected with the primary blade unit  3 , and a secondary blade unit  4  connected with the primary blade unit  3 . 
     The primary blade unit  3  includes a mounting seat  31  having a first side  37  provided with a plurality of flow channels  32 , a primary blade  35  rotatably mounted in the mounting seat  31  and having a periphery provided with a plurality of ventilating holes  36  that are movable to align with the flow channels  32  of the mounting seat  31  respectively, and a driving mechanism  34  mounted on the mounting seat  31  to drive and rotate the primary blade  35 . 
     The mounting seat  31  of the primary blade unit  3  is hollow and has a tapered shape. The mounting seat  31  of the primary blade unit  3  is sandwiched between the primary blade  35  and the guiding member  2 . The first side  37  of the mounting seat  31  has a surface provided with a through hole  311 . The mounting seat  31  of the primary blade unit  3  has an open second side provided with a plurality of connecting holes  314 . The mounting seat  31  of the primary blade unit  3  has a diameter increased gradually from the first side  37  to the open second side of the mounting seat  31 . The flow channels  32  of the mounting seat  31  are arranged in an annular shape. 
     The driving mechanism  34  of the primary blade unit  3  is located between the mounting seat  31  and the guiding member  2 . The driving mechanism  34  of the primary blade unit  3  includes a propeller shaft  341  extended through the through hole  311  of the mounting seat  31  and extended into the mounting seat  31  and a drive motor (not shown) for driving and rotating the propeller shaft  341 . 
     The primary blade unit  3  further includes a spindle  33  rotatably mounted on a central portion of the first side  37  of the mounting seat  31  and connected with the primary blade  35  to rotate the primary blade  35 , a drive gear  312  secured on the propeller shaft  341  of the driving mechanism  34  to rotate in concert with the propeller shaft  341  of the driving mechanism  34 , and a driven gear  313  secured on the spindle  33  to rotate the spindle  33  and meshing with and driven by the drive gear  312 . The driven gear  313  of the primary blade unit  3  is located between the primary blade  35  and the first side  37  of the mounting seat  31 . The primary blade  35  of the primary blade unit  3  has a central portion secured on the spindle  33  to rotate in concert with the spindle  33 . The ventilating holes  36  of the primary blade  35  are arranged in an annular shape. 
     The guiding member  2  is located outside of the mounting seat  31  of the primary blade unit  3  and has a periphery provided with a plurality of flow guiding ducts  22  aligning with the flow channels  32  of the mounting seat  31  respectively. The flow guiding ducts  22  of the guiding member  2  are arranged in an annular shape. The guiding member  2  has an outer side provided with a flow guiding surface  23 . The flow guiding surface  23  of the guiding member  2  has a tapered shape and is connected to the flow guiding ducts  22 . The guiding member  2  has a central portion provided with a receiving recess  211  for mounting the driving mechanism  34  of the primary blade unit  3 . 
     The secondary blade unit  4  includes a plurality of mounting plates  41  connected with the mounting seat  31  of the primary blade unit  3 , and an end cap  45  connected with the mounting plates  41 . The end cap  45  of the secondary blade unit  4  has a surface provided with a plurality of air inlets  450  connected to an interior of the mounting plates  41 . 
     The mounting plates  41  of the secondary blade unit  4  are located between the mounting seat  31  of the primary blade unit  3  and the end cap  45  of the secondary blade unit  4 , and the mounting seat  31  of the primary blade unit  3  is received in the mounting plates  41  of the secondary blade unit  4 . Each of the mounting plates  41  of the secondary blade unit  4  has a substantially arc-shaped profile and has a first end connected with the mounting seat  31  of the primary blade unit  3  and a second end connected with the end cap  45 . The mounting plates  41  of the secondary blade unit  4  are connected with each other to form a substantially cylindrical barrel. Each of the mounting plates  41  of the secondary blade unit  4  has a side provided with at least one connecting rod  411  connected with a respective one of the connecting holes  314  of the mounting seat  31  to connect the mounting plates  41  of the secondary blade unit  4  with of the primary blade unit  3 . 
     Each of the mounting plates  41  of the secondary blade unit  4  has a surface provided with a vent hole  42  for mounting a plurality of secondary blades  43 . The vent hole  42  of each of the mounting plates  41  is connected to the flow guiding surface  23  and the flow guiding ducts  22  of the guiding member  2 . Each of the secondary blades  43  is pivotally mounted in the vent hole  42 . The secondary blade unit  4  further includes a plurality of adjusting members  44  each movably mounted on a respective one of the mounting plates  41  and each pivotally connected with the secondary blades  43  on the respective mounting plate  41  to drive and pivot the secondary blades  43  relative to the respective mounting plate  41 . 
     In operation, referring to  FIG. 5  with reference to  FIGS. 2-4 , the propeller shaft  341  of the driving mechanism  34  is rotated by the drive motor to rotate the drive gear  312  which rotates the driven gear  313  which rotates the spindle  33  which rotates the primary blade  35  so that the primary blade  35  is rotated successively to produce a suction force to draft or draw an air flow. Thus, the ambient air flow is introduced through the air inlets  450  of the end cap  45 , the mounting plates  41  of the secondary blade unit  4 , the flow guiding ducts  22  of the guiding member  2 , the flow channels  32  of the mounting seat  31  and the ventilating holes  36  of the primary blade  35  into the mounting seat  31  of the primary blade unit  3  and is injected outward from the mounting seat  31  of the primary blade unit  3  to provide a ventilating function. At this time, the air flow is partially guided by the flow guiding surface  23  of the guiding member  2  to flow through the vent hole  42  of each of the mounting plates  41  and is injected outward from the vent hole  42  of each of the mounting plates  41  to further provide a ventilating function. Thus, when the air flow is introduced from the ambient environment into the fan device, the primary blade unit  3  and the secondary blade unit  4  can guide and inject the air flow outward in two different directions as shown in  FIG. 5  to diffuse and spread the air flow and to increase the air circulation, thereby greatly enhancing the air ventilating and circulating effect. 
     As shown in  FIG. 6 , the secondary blades  43  are driven by the adjusting members  44  and are pivoted in the vent hole  42  to change the inclined angle of each of the secondary blades  43  relative to the vent hole  42  of each of the mounting plates  41  so as to adjust the air output from the vent hole  42  of each of the mounting plates  41 . 
     Accordingly, when the ambient air flow is introduced into the fan device, the primary blade unit  3  and the secondary blade unit  4  guide and inject the air flow outward in two different directions simultaneously to diffuse and spread the air flow largely and to increase the air circulation, thereby greatly enhancing the air ventilating and circulating effect. In addition, the fan device has a better air ventilating and circulating effect so as to reduce the number of fans that are necessary in a determined space, thereby decreasing the cost. Further, the air flow is guided through the flow guiding ducts  22  of the guiding member  2 , the flow channels  32  of the mounting seat  31  and the ventilating holes  36  of the primary blade  35  into the mounting seat  31  of the primary blade unit  3  so that the air flow is circulated smoothly and quickly. Further, the secondary blades  43  are pivoted in the vent hole  42  to change the inclined angle of each of the secondary blades  43  so as to adjust the air output from the vent hole  42  of each of the mounting plates  41 . 
     Although the invention has been explained in relation to its preferred embodiment(s) as mentioned above, it is to be understood that many other possible modifications and variations can be made without departing from the scope of the present invention. It is, therefore, contemplated that the appended claim or claims will cover such modifications and variations that fall within the true scope of the invention.