Fan structure for mounting in a light steel structure of a ceiling

Abstract

A fan structure is disclosed to include a fan holder holding a fan motor and a fan blade, a bottom cover frame, which has smoothly arched bottom wall, a horizontal mounting flange extending around the smoothly arched bottom wall and mounted in one frame sash of a light steel structure of a ceiling, a vertical connection flange connected to the top cover shell of the fan holder, a circular center opening corresponding to the fan blade, ventilation holes spaced around the circular center opening and a fence disposed above the circular center opening and surrounding the fan blade defining with the top cover shell of the fan holder a space for causing a gate effect during rotation of the fan blade, and a grille mounted in the circular center opening of the bottom cover shell for output of currents of air caused by the fan blade.

1 . A fan structure mountable in one frame sash of a light steel structure of a ceiling, comprising:
 a fan holder, said fan holder comprising a top cover shell, a fan motor mounted in a bottom side of said top cover shell, and a fan blade coupled to an output shaft of said fan motor and rotatable by said fan motor to cause currents of air;   a bottom cover frame, said bottom cover frame comprising a smoothly arched bottom wall curving smoothly downwards, a horizontal mounting flange extending around said smoothly arched bottom wall and mounted in one frame sash of a light steel structure of a ceiling, a vertical connection flange upwardly extending from the connection between said smoothly arched bottom wall and said horizontal mounting flange and connected to said top cover shell of said fan holder, a circular center opening cut through said smoothly arched bottom wall at the center corresponding to said fan blade, a plurality of ventilation holes cut through said smoothly arched bottom wall around said circular center opening, and a fence disposed above said circular center opening and surrounding said fan blade, said fence having a top edge defining with said top cover shell of said fan holder a space for causing a gate effect during rotation of said fan blade; and   a grille mounted in said circular center opening of said bottom cover frame for output of currents of air caused by said fan blade;   wherein when said fan blade is rotated by said fan motor to cause currents of air, said currents of air go from the outside of the fan structure into the inside of said bottom cover frame through said ventilation holes over said fence and then go toward the outside of the fan structure through open spaces in said grille.   
   
   
       2 . The fan structure as claimed in  claim 1 , wherein said fence protrudes upwards from said smoothly arched bottom wall and extends around said circular center opening. 
   
   
       3 . The fan structure as claimed in  claim 1 , wherein said ventilation holes are respectively disposed in four corners of said smoothly arched bottom wall and at the midpoint at each of four sides between each two corners of said four corners. 
   
   
       4 . The fan structure as claimed in  claim 1 , wherein said top cover shell of said fan holder has an opening and a fan duct connecting the opening of said top cover shell of said fan holder to an air conditioning system for guiding regulated air from said air conditioning system into the fan structure. 
   
   
       5 . The fan structure as claimed in  claim 4 , wherein the opening of said top cover shell of said fan holder is located on the center of said top cover shell of said fan holder, and said top cover shell of said fan holder comprises a mounting flange extending around the opening thereof for the mounting of said fan duct. 
   
   
       6 . The fan structure as claimed in  claim 4 , wherein the opening of said top cover shell of said fan holder is located on the center of said top cover shell of said fan holder, and has a fan duct connector affixed thereto for the connection of said fan duct. 
   
   
       7 . The fan structure as claimed in  claim 4 , further comprising a synchronizing motor mounted in said bottom cover frame, a grille connector affixed to an output shaft of said synchronizing motor to secure said grille for allowing rotation of said grille in said circular center opening of said bottom cover frame by said synchronizing motor. 
   
   
       8 . The fan structure as claimed in  claim 7 , wherein said bottom cover frame comprises a support structure suspending in said circular center opening, said support structure supporting said synchronizing motor at a bottom side thereof. 
   
   
       9 . The fan structure as claimed in  claim 8 , wherein said fan motor is affixed to the center of a top side of said support structure. 
   
   
       10 . The fan structure as claimed in  claim 7 , further comprising a cap fastened to a bottom side of said grille to block the connection between said grille and said grille connector. 
   
   
       11 . The fan structure as claimed in  claim 4 , further comprising an electric box mounted in said bottom cover frame outside said fence and covered with a cover for receiving a fan control circuit board.