Abstract:
The present invention discloses a sectional fan frame structure composed of two units or two units and a circular plate frame. The units can be made in different shapes as needed, and the units come with fasteners. The circular plate frame is formed by enclosing a plate, and the fasteners are installed at the positions of connecting the circular plate frame and the units. Therefore, a fan frame can be assembled by the latch of fasteners between the units, or the unit and the circular plate frame, so as to achieve the effects of simplifying the development of a mold, providing an easy demold after an injection molding, assembling a fan frame with a different height by changing the width of the circular plate frame, and saving the cost of the mold.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a sectional fan frame structure, and more particularly to a fan frame structure formed by connecting a unit with another unit or a unit with a circular plate frame, and a fan frame with a different height can be achieved by changing the width of the circular frame, and thus the cost for developing a mold can be saved. 
         [0003]    2. Description of the Related Art 
         [0004]    In the application of a conventional axial-flow fan, vanes are installed in a fan frame assembly. The fan frame assembly is divided into two main types: a single-layer fan frame assembly and a double-layer fan frame assembly. Although the single-layer fan frame assembly comes with a simple structure, the single-layer fan frame assembly is usually installed at a hidden position inside a casing due to its non-stylish appearance. In  FIG. 1 , the double-layer fan frame assembly has a more stylish appearance, and thus it can be installed in a casing as well as on a desk top. However, both sides of the double-layer fan frame assembly have a separated fan frame  1 , two fan frame bodies connected to the fan frame  1  and tapered inward. Obviously, the development of such mold incurs a complicated process and a high cost. Since the mold is manufactured and formed integrally by a mold injection method, therefore the demold is relatively difficult. Furthermore, it is necessary to design and develop the mold again. Although vanes generally come with a standard diameter, yet the height of the fan frame bodies  2  varies to cope with a different curvature of the vanes and the development of new products. In addition to the cost of developing the mold, the time to market is delayed, and such conventional way of developing a fan is definitely not suitable. 
         [0005]    In view of the foregoing shortcomings of the prior art, the inventor of the present invention based on years of experience in the related industry to conduct extensive researches and experiments to overcome the shortcomings of the prior art, and finally developed a sectional fan frame structure in accordance with the present invention. 
       SUMMARY OF THE INVENTION 
       [0006]    The primary objective of the present invention is to provide a sectional fan frame structure comprised of two units or two units and a circular plate frame for simplifying the development of a mold and providing an easily demold after an injection molding. 
         [0007]    Another objective of the present invention is to provide a sectional fan frame structure in conformity with vanes of a different curvature, and the width of a circular plate frame can be changed by increasing the height of a fan frame without resigning the fan frame assembly. 
         [0008]    A further objective of the present invention is to provide a sectional fan frame structure, wherein the units or the circular plate frame have corresponding fasteners disposed at specific positions for assembling the units or the unit and the circular plate frame sequentially, such that the units or the circular plate frame can be fixed by the fasteners to form a fan frame. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0009]      FIG. 1  is a perspective view of a conventional structure; 
           [0010]      FIG. 2  is a perspective view of a first preferred embodiment of the present invention; 
           [0011]      FIG. 3  is a perspective view of a first preferred embodiment of the present invention; 
           [0012]      FIG. 3A  is an enlarged view of a latch in accordance with a first preferred embodiment of the present invention; 
           [0013]      FIG. 4  is a schematic sectional view of a first preferred embodiment of the present invention; 
           [0014]      FIG. 4A  is a schematic sectional view of a latch in accordance with a first preferred embodiment of the present invention; 
           [0015]      FIG. 5  is a perspective view of a second preferred embodiment of the present invention; 
           [0016]      FIG. 6  is an exploded view of a third preferred embodiment of the present invention; 
           [0017]      FIG. 7  is a perspective view of a third preferred embodiment of the present invention; 
           [0018]      FIG. 8  is an exploded view of a fourth preferred embodiment of the present invention; 
           [0019]      FIG. 9  is a perspective view of a fourth preferred embodiment of the present invention; and 
           [0020]      FIG. 10  is an exploded view of a fifth preferred embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0021]    To make it easier for our examiner to understand the present invention, the following detailed description with reference to the accompanying drawings of embodiments are given for example, but such preferred embodiments are not intended to limit the scope of the present invention. For simplicity, like numerals are used for like elements for the description of the specification of the present invention. Referring to  FIGS. 2 ,  3 ,  3 A,  4 ,  4 A for a sectional fan frame structure of a first preferred embodiment of the present invention, the structure comprises a fan frame  10 , and the fan frame  10  is composed of two units  11   a  and a circular plate frame  12 , and the units  11   a  are rectangular frame bases (but ordinary persons skilled in the art can substitute it with a frame base of another shape), and each unit  11   a  has a circular opening  111  and a fastener  20  disposed on a specific position of the unit  11   a,  and the fastener  20  can be a hook or an embedding groove, and an axle seat  113  is connected to the middle of the opening  111  of one of the units  11   a  through a rib  114 , and the axle seat  113  has a circuit (not shown in the figure) for turning on the fan. The circular plate frame  12  is formed by enclosing a rectangular plate, and a fastener  20  is disposed separately on both sides of the circular plate frame  12 , and the fasteners  20  are latched to the corresponding positions of the fasteners  20  of the units  11   a.  Further, the circular plate frame  12  has a plurality of protrusions  121  integrally formed with the circular plate frame  12  by a punching method, and at least one side of the protrusion  121  is connected to the circular plate frame  12 , such that the protrusions  121  can provide an air flow guide effect to the wind entering the fan frame  10 . 
         [0022]    During the assembling process, the units  11   a  are disposed respectively on both sides of the circular plate frame  12 , and the fasteners  20  of the circular plate frame  12  are latched with the fasteners  20  of the units  11   a  (as shown in  FIGS. 3 and 3   a ), such that the units  11   a,  the circular plate frame  12  and the fasteners  20  are connected to form a fan frame. 
         [0023]    Referring to  FIG. 5  for a second preferred embodiment of the present invention, the structure comprises a fan frame  10  composed of two units  11   a  and a circular plate frame  12 . The main difference between this preferred embodiment and the first preferred embodiment resides in that the circular plate frame  12  has a plurality of punched holes  122  (which can be punched into different shapes or words). With the punched holes  122 , the airflow is increased during the operation of the fan. 
         [0024]    Referring to  FIG. 6  for a third preferred embodiment of the present invention, the structure comprises a fan frame  10  composed of a first unit  11   b  and a second unit  11   c,  and the first and second units  11   b,    11   c  are rectangular frame bases (but ordinary persons skilled in the art can substitute it with a frame base of another shape), and the first and second units  11   b,    11   c  separately have a circular opening  111 , and a fastener  20  disposed at a specific position of the first and second units  11   b,    11   c.  The fastener can be a hook or an embedding groove, which is disposed separately on an edge of the opening  111  and each distal edge of the first and second units  11   b,    11   c,  and the second unit  11   c  is an integrally formed circular fixing frame  13 , and the circular fixing frame  13  comes with a specific height, and the circular fixing frame  13  of the second unit  11   c  has a fastener  20 , and the position of the fastener  20  corresponds to the position of the fastener  20  of the first unit  11   b,  and the circular fixing frame  13  has a plurality of protrusions  131  integrally formed with the circular fixing frame  13  by a punching method, and at least one side of the protrusion  131  is connected with the circular fixing frame  13 . Further, the second unit  11   c  has an axle seat  113  disposed at an end without being connected to the circular fixing frame  13 , and the axle seat  113  has a circuit (not shown in the figure) for turning on the fan. Further, a rib  114  is disposed at the periphery of the axle seat  113  and connected to the circular fixing frame  13 . 
         [0025]    During the assembling process, the first unit  11   b  is in contact with a circular fixing frame  13  on the second unit  11   c,  and then the fasteners  20  of the first unit  11   b  are latched with the fasteners  20  of the second unit  11   c  and the circular fixing frame  13 , such that the first and second units  11   b,    11   c  are connected to form a fan frame (as shown in  FIG. 7 ). 
         [0026]    Referring to  FIG. 8  for a fourth preferred embodiment of the present invention, the structure is a fan frame  10  composed of two units  11   d  integrally formed with the circular fixing frame  13  to constitute a rectangular frame base, and the circular fixing frame  13  has a specific height, and the circular fixing frame  13  has a plurality of protrusions  131  integrally formed with the circular fixing frame  13  by a punching method, and at least one side of the protrusion  131  is connected to the circular fixing frame  13 , and the units  11   d  and the circular fixing frame  13  have corresponding fasteners  20 , which can be hooks or embedding grooves. Further, an axle seat  113  is connected to one of the units  11   d,  and the axle seat  113  has a circuit (not shown in the figure) for turning on the fan, and a rib  114  is disposed at the periphery of the axle seat  113  and connected to the circular fixing frame  13 . 
         [0027]    During the assembling process, the fastener  20  of a unit  11   d  is latched with the fastener  20  of another unit  11   d  (as shown in  FIG. 9 ), so that the two units  11   d  are connected to form a fan frame  10 , and the protrusions  131  of the circular fixing frame  13  are interlaced or included between the units  11   d.    
         [0028]    Referring to  FIG. 10  for a fifth preferred embodiment of the present invention, the structure is a fan frame  10  composed of two units  11   d  and a circular plate frame  12 , and the units  11   d  are integrally formed with a circular fixing frame  13  to form a rectangular frame base (but ordinary persons skilled in the art can substitute it with a frame base of another shape), and the circular fixing frame  13  comes with a specific height, and an axle seat  113  is disposed and connected to one of the units  11   d  and has a circuit (not shown in the figure) for turning on the fan. Further, a rib  114  is disposed at the periphery of the axle seat  113  and connected to the circular fixing frame  13 . The circular plate frame  12  is formed by enclosing a rectangular plate, and a fastener  20  is disposed separately on both sides of the circular plate frame  12  and the fastener  20  can be a hook or an embedding groove, and the fasteners  20  are latched to the positions of the corresponding fasteners  20  on both sides of the unit  11   d.  Further the circular fixing frame  13  and the circular plate frame  12  of the unit  11   d  have a plurality of protrusions  131 ,  121 , and the protrusions  131 ,  121  are integrally formed with the circular fixing frame  13  and the circular plate frame  12  respectively by a punching method, and at least one side of the protrusions  131 ,  121  is connected to the circular fixing frame  13  and the circular plate frame  12 , such that the protrusions  131 ,  121  can provide an air flow guide effect to the wind entering the fan frame. 
         [0029]    During the assembling process, the fasteners  20  of the unit  11   d  are latched to connect the aforementioned three components, such that the circular plate frame  12  is included in the unit  11   d  to form a fan frame  10 , and the protrusions  131 ,  121  of the circular fixing frame  13  and the circular plate frame  12  are interlaced or corresponding to each other, and the height of the fan frame  10  can be adjusted by changing the quantity of circular plate frames  12 . 
         [0030]    Therefore, the units or circular frames can be manufactured into different shapes according to different requirements or designs, so as to simplify the development of a mold and provide an easy mold after an injection molding. In the meantime, a fan frame of a different height can be achieved by changing the width of the circular frame, and thus the invention can save the cost of the mold. 
         [0031]    In summation of the description above, the present invention enhances the prior art and also complies with the patent application requirements. The description and its accompanied drawings are used for describing preferred embodiments of the present invention, and it is to be understood that the invention is not limited thereto. To the contrary, it is intended to cover various modifications and similar arrangements and procedures, and the scope of the appended claims therefore should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements and procedures.