Fan device for smoke exhauster

Abstract

A fan device for a smoke exhauster includes a housing having an upper plate and a lower plate, and the upper plate is secured to a motor and rotated by the motor, the lower plate includes a bore to allow an air to flow into the housing of the fan device, and a number of fan blades secured between the upper plate and the lower plate and each fan blade include a curved bottom edge to allow the air to flow into the chamber of the fan device before contacting with the fan blades, and the fan blades each include a number of orifices for reducing a noise generated by the fan blades when the fan blades are rotated relative to the motor. The fan blades are preferably disposed inclined relative to the upper plate and the lower plate.

1 . A fan device for a smoke exhauster comprising:
 a housing including an upper plate, and a lower plate disposed below said upper plate for forming a chamber between said upper plate and said lower plate,   said upper plate including a plurality of slits formed therein, said lower plate including a plurality of slots formed therein, and including a bore formed therein, and said upper plate including a casing provided therein, said chamber of said fan device being communicating with said bore of said lower plate to allow an air to flow through said bore of said lower plate and to flow into said chamber of said fan device,   a motor received in said casing of said upper plate and including a spindle secured to said casing of said upper plate of said housing for allowing said casing of said housing to be rotated and driven by said spindle of said motor and to be rotated relative to said motor, and   a plurality of fan blades disposed in said chamber which is formed between said upper plate and said lower plate of said housing, said fan blades each including an upper portion having a plurality of ears extended upwardly therefrom and engaged through said slits of said upper plate for securing said fan blades to said upper plate, and each including a lower portion having a plurality of ears extended downwardly therefrom and engaged through said slots of said lower plate for securing said fan blades to said lower plate and for securing said fan blades between said upper plate and said lower plate, and   said fan blades each including a curved bottom edge curved inwardly and upwardly from said lower plate toward said upper plate to allow the air to flow into said chamber of said fan device before contacting with said fan blades, and said fan blades each including a plurality of orifices formed therein for allowing the air to flow through said orifices of said fan blades and for reducing a noise generated by said fan blades when said fan blades are rotated relative to said motor.   
   
   
       2 . The smoke exhauster as claimed in  claim 1 , wherein said fan blades each includes a curved outer segment, and a planar inner segment. 
   
   
       3 . The smoke exhauster as claimed in  claim 1 , wherein said fan blades are disposed inclined relative to said upper plate and said lower plate for increasing an air scooping effect of said fan blades.