Electric fan

Abstract

Disclosed herein is an electric fan. The electric fan includes a casing, a rotary unit and a cover. The casing has a frame shape such that a first opening is formed in a central portion of the casing. An inlet hole and an outlet hole are respectively formed in inner and outer peripheral surfaces of the frame. A space is defined in the casing. The rotary unit includes an impeller installed in the space, and a drive unit. The rotary unit is configured such that when the impeller is rotated by the drive unit, external air is drawn into the space through the inlet hole and then discharged out of the space through an outlet hole. The cover is installed on a front part of the casing in a direct contact manner. The cover defines a second opening communicating with the first opening so that air supplied from the outlet hole is discharged out of the second opening.

1 . An electric fan, comprising:
 a casing having a frame shape such that a first opening is formed in a central portion of the casing, with an inlet hole and an outlet hole respectively formed in inner and outer peripheral surfaces of the frame, and a space defined in the casing;   a rotary unit comprising an impeller installed in the space, and a drive unit, the rotary unit being configured such that when the impeller is rotated by the drive unit, external air is drawn into the space through the inlet hole and then discharged out of the space through an outlet hole; and   a cover installed on a front part of the casing in a direct contact manner, the cover defining a second opening communicating with the first opening so that air supplied from the outlet hole is discharged out of the second opening.   
     
     
         2 . The electric fan of  claim 1 , wherein an inner surface of the second opening is inclined such that the second opening is increased in cross-sectional area from a rear end thereof to a front end. 
     
     
         3 . The electric fan of  claim 1 , wherein the impeller of the rotary unit installed in the space comprises a shaft and a plurality of blades radially provided on an outer circumferential surface of the shaft, wherein the shaft is connected to the drive unit so that the shaft is electrically-driven. 
     
     
         4 . The electric fan of  claim 1 , wherein the space comprises two columns of spaces spaced apart from each other, and the impeller comprises impellers respectively placed upright in the spaces. 
     
     
         5 . The electric fan of  claim 1 , wherein the space comprises two columns and two rows of spaces continuously connected at ends thereof to each other, and the impeller comprises impellers vertically or horizontally installed in the respective spaces. 
     
     
         6 . The electric fan of  claim 3 , wherein the impeller is installed in the space by a bracket,
 the bracket comprising:
 a connection part having a predetermined length; 
 a fixed part bent from an upper end of the connection part, the fixed part having a connection hole through which the shaft is coupled to the fixed part; 
 a support part bent from a lower end of the connection part, the support part being coupled to a lower end of the drive unit; and 
 connection brackets respectively connected to the fixed part and the support part, the connection brackets being integrally fastened to respective fixed brackets provided in the space.