Patent Publication Number: US-2023143101-A1

Title: Ceiling fan having double-layer blades

Description:
FIELD OF THE INVENTION 
     The present invention relates to a ceiling fan, and more particularly to a ceiling fan having double-layer blades. 
     BACKGROUND OF THE INVENTION 
     A conventional double-motor ceiling fan structure includes a ceiling fan body. Either side of the ceiling fan body is connected with a motor. Each motor has a motor housing. The motor housing is provided with a plurality of blade holders. Each blade holder is provided with a blade. The dual-motor ceiling fan structure is driven by the motors to rotate the corresponding blades. Compared with a single-motor ceiling fan, the dual-motor ceiling fan structure can generate greater current of air for cooling. 
     However, the above-mentioned dual-motor ceiling fan structure is not only complicated and cumbersome but also expensive. Another conventional dual-motor ceiling fan structure provides blades that are rotated reversely. This rotation will offset air current and cannot generate more wind volume. Accordingly, the inventor of the present invention has devoted himself based on his many years of practical experiences to solve these problems. 
     SUMMARY OF THE INVENTION 
     The primary object of the present invention is to provide a ceiling fan having double-layer blades, which increases the current of air for cooling and has the advantages of saving costs and installation costs. 
     In order to achieve the above object, the present invention provides a ceiling fan having double-layer blades. The ceiling fan comprises a motor unit, a blade frame unit, a first blade unit, and a second blade unit. The motor unit includes a motor. The motor has a rotating component. The blade frame unit has a blade frame body. The blade frame body is arranged on an outer peripheral side of the motor. The blade frame body is fixedly connected to the rotating component of the motor. An upper end of the blade frame body has an upper mounting portion. A lower end of the blade frame body has a lower mounting portion. The first blade unit includes a plurality of first blades. The first blades each have a first fixing portion, a first extension wall, and a first blade portion. The first fixing portions of the first blades are fixed to the upper mounting portion. The first extension wall and the first blade portion of each first blade are connected to each other. The first extension walls of the first blades extend axially along the blade frame body. The first extension walls of the first blades surround an outside of the blade frame body to collectively form a first casing. The first casing has a first accommodating space therein. The second blade unit includes a plurality of second blades. The second blades each have a second fixing portion, a second extension wall, and a second blade portion. The second fixing portions of the second blades are fixed to the lower mounting portion. The second extension wall and the second blade portion of each second blade are connected to each other. The second extension walls of the second blades extend axially along the blade frame body. The second extension walls of the second blades surround the outside of the blade frame body to collectively form a second casing. The second casing has a second accommodating space therein. The first accommodating space of the first casing and the second accommodating space of the second casing are configured to accommodate the blade frame body and the motor. 
     In the ceiling fan having double-layer blades provided by the present invention, the first casing formed by the first blades and the second casing formed by the second blades collectively surround the outside of the blade frame body, so that there is no need for the motor unit to provide a motor housing for connecting the first blade unit and the second blade unit, thereby saving costs and installation costs. With the multi-layer arrangement of the first blades of the first blade unit and the second blades of the second blade unit, the ceiling fan having double-layer blades can increase the current of air for cooling. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a perspective view of a preferred embodiment of the present invention; 
         FIG.  2    is a top view of the preferred embodiment of the present invention; 
         FIG.  3    is an exploded view of the preferred embodiment of the present invention; 
         FIG.  4    is another exploded view of the preferred embodiment of the present invention; 
         FIG.  5    is a further exploded view seen from the bottom of the preferred embodiment of the present invention; and 
         FIG.  6    is a schematic view showing the installation of the preferred embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings. 
       FIG.  1    is a perspective view of a preferred embodiment of the present invention.  FIG.  2    is a top view of the preferred embodiment of the present invention.  FIG.  3    is an exploded view of the preferred embodiment of the present invention. The present invention discloses a ceiling fan  100  having double-layer blades, comprising a motor unit  10 , a blade frame unit  20 , a first blade unit  30 , a second blade unit  40 , an upper cover  50 , and a lamp  60 . 
     The motor unit  10  includes a motor  11 . The motor  11  has a rotating component  12 . An upper retaining portion  13  is fixedly connected to the top of the motor  11 . The upper retaining portion  13  is fixedly connected to a down rod  14 , so as to be fixed to the ceiling. The upper retaining portion  13  is fixedly connected to the down rod  14  through a connecting seat  15 . A lower retaining portion  16  is fixedly connected to the bottom of the motor  11 . 
       FIG.  4    is another exploded view of the preferred embodiment of the present invention.  FIG.  5    is a further exploded view seen from the bottom of the preferred embodiment of the present invention. The blade frame unit  20  has a blade frame body  21 . The blade frame body  21  is arranged on the outer peripheral side of the motor  11 . The blade frame body  21  is fixedly connected to the rotating component  12  of the motor  11 . The upper end of the blade frame body  21  has an upper mounting portion  22 . The upper mounting portion  22  may be composed of screw holes. The lower end of the blade frame body  21  has a lower mounting portion  23 . The lower mounting portion  23  may be composed of screw holes. The blade frame body  21  has an annular wall  24 . The top end of the annular wall  24  has an upper flange  25  extending radially and outwardly. The upper mounting portion  22  is disposed on the upper flange  25 . The bottom end of the annular wall  24  has a lower flange  26  extending radially and outwardly. The lower mounting portion  23  is disposed on the lower flange  26 . A motor mounting portion  27  extends from the inner side of the annular wall  24  toward the axis. The rotating component  12  of the motor  11  is connected to the motor mounting portion  27 . 
     The first blade unit  30  includes a plurality of first blades  31 . The first blades  31  each have a first fixing portion  32 , a first extension wall  33 , and a first blade portion  34 . The first fixing portions  32  of the first blades  31  are fixed to the upper mounting portion  22 . The first fixing portions  32  of the first blades  31  may be composed of screw holes, and are locked to the upper mounting portion  22  with screws. The first extension wall  33  and the first blade portion  34  of each first blade  31  are connected to each other. The first extension walls  33  of the first blades  31  extend axially along the blade frame body  21 . The first extension walls  33  of the first blades  31  surround the outside of the blade frame body  21  to collectively form a first casing  35 . The first casing  35  has a first accommodating space  36  therein. One side of the top of the first extension wall  33  of each first blade  31 , adjacent to the first blade portion  34 , and the first blade portion  34  have a first inner arc portion  37  extending toward the axis of the blade frame body  21 . The first inner arc portions  37  are arranged on top of the upper flange  25  so that the upper flange  25  supports the first inner arc portions  37 . The first fixing portions  32  of the first blades  31  are disposed on the first inner arc portions  37 , respectively. The other side of the top of the first extension wall  33  of each first blade  31 , opposite to the first blade portion  34 , is formed with a first edge  38 . The first edge  38  of each first blade  31  is lower than the first inner arc portion  37 . Each first edge  38  corresponds to the first inner arc portion  37  of the coupled first blade  31  for the first inner arc portion  37 of the coupled first blade  31  to pass therethough. One side of the first inner arc portion  37  of each first blade  31 , adjacent to the first edge  38 , is provided with a first abutting surface  39  to abut against the first inner arc portion  37  of the coupled first blade  31 . 
     The second blade unit  40  includes a plurality of second blades  41 . The second blades  41  each have a second fixing portion  42 , a second extension wall  43 , and a second blade portion  44 . The second fixing portions  42  of the second blades  41  are fixed to the lower mounting portion  23 . The second fixing portions  42  of the second blades  41  may be composed of screw holes, and are locked to the lower mounting portion  23  with screws. The second extension walls  43  of the second blades  41  are adjacent to and beneath the first extension walls  33  of the first blades  31 . The second extension wall  43  and the second blade portion  44  of each second blade  41  are connected to each other. The second extension walls  43  of the second blades  41  extend axially along the blade frame body  21 . The second extension walls  43  of the second blades  41  surround the outside of the blade frame body  21  to collectively form a second casing  45 . The second casing  45  has a second accommodating space  46  therein. The first accommodating space  36  of the first casing  35  and the second accommodating space  46  of the second casing  45  are configured to accommodate the blade frame body  21  and the motor  11 . One side of the top of the second extension wall  43  of each second blade  41 , adjacent to the second blade portion  44 , and the second blade portion  44  have a second inner arc portion  47  extending toward the axis of the blade frame body  21 . The second inner arc portions  47  are arranged on top of the lower flange  26  so that the lower flange  26  supports the second inner arc portions  47 . The second fixing portions  42  of the second blades  41  are disposed on the second inner arc portions  47 , respectively. The other side of the top of the second extension wall  43  of each second blade  41 , opposite to the second blade portion  44 , is formed with a second edge  48 . The second edge  48  of each second blade  41  is lower than the second inner arc portion  47 . Each second edge  48  corresponds to the second inner arc portion  47  of the coupled second blade  41  for the second inner arc portion  47  of the coupled second blade  41  to pass therethough. One side of the second inner arc portion  47  of each second blade  41 , adjacent to the second edge  48 , is provided with a second abutting surface  49  to abut against the second inner arc portion  47  of the coupled second blade  41 . In this embodiment of the present invention, the first blade portions  34  of the first blades  31  and the second blade portions  44  of the second blades  41  are arranged crosswise. 
     The upper cover  50  is disposed on the outside of the connecting seat  15 . The upper cover  50  is located above the blade frame body  21 . The down rod  14  is inserted through the upper cover  50 . The upper cover  50  has a flange  51 . The flange  51  of the upper cover  50  is located between the first inner arc portions  37  of the first blades  31 . 
     The lamp  60  has a lamp module  61  and a lampshade  62 . The lamp module  61  is fixedly connected to the lower retaining portion  16 . The lampshade  62  is fixed to the outside of the lamp module  61  and located under the second extension walls  43  of the second blades  41 . 
       FIG.  6    is a schematic view showing the installation of the preferred embodiment of the present invention. When the ceiling fan  100  having double-layer blades is to be assembled, the first fixing portions  32  of the first blades  31  are first aligned with the upper mounting portion  22  of the blade frame body  21 , and the second fixing portions  42  of the second blades  41  are aligned with the lower mounting portion  23  of the blade frame body  21 . The first abutting surface  39  of each first blade  31  abuts against the first inner arc portion  37  of the coupled first blade  31 . The second abutting surface  49  of each second blade  41  abuts against the second inner arc portion  47  of the coupled second blade  41 . The first extension wall  33  of each first blade  31  abuts against the first extension wall  33  of the coupled first blade  31 . The second extension wall  43  of each second blade  41  abuts against the second extension wall  43  of the coupled second blade  41 . The first fixing portions  32  of the first blades  31  are locked to the upper mounting portion  22  by screws, respectively. The second fixing portions  42  of the second blades  41  are locked to the lower mounting portion  23  by screws, respectively. The first casing  35  formed by the first blades  31  and the second casing  45  formed by the second blades  41  collectively surround the outside of the blade frame body  21 . The blade frame body  21  is accommodated in the first accommodating space  36  and the second accommodating space  46  to quickly complete the assembly of the ceiling fan  100  with double-layer blades. 
     It is worth mentioning that in the ceiling fan  100  having double-layer blades of the present invention, the first casing  35  formed by the first blades  31  and the second casing  45  formed by the second blades  41  collectively surround the outside of the blade frame body  21 , so that there is no need for the motor unit  10  to provide a motor housing for connecting the first blade unit  30  and the second blade unit  40 , thereby saving costs and installation costs. With the multi-layer arrangement of the first blades  31  of the first blade unit  30  and the second blades  41  of the second blade unit  40 , the ceiling fan  100  having double-layer blades can increase the current of air for cooling. 
     Although particular embodiments of the present invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the present invention. Accordingly, the present invention is not to be limited except as by the appended claims.