Drum fan

Abstract

The present utility model relates to ventilation products, and particularly to a drum fan. The drum fan comprises a cylindrical housing ( 1 ), a front grid guard ( 3 ) at a front end face of the cylindrical housing ( 1 ), a rear grid guard ( 4 ) at a rear end face of the cylindrical housing ( 1 ) and fan blades ( 2 ) for wind supply, characterized in that the fan blades ( 2 ) are totally or partially disposed outside the rear end face of the cylindrical housing ( 1 ). The drum fan is advantageous in a large wind supply, a low noise and a longer wind supply distance and can be extensively applied in factories, farms, warehouses and other public sites.

1 . A drum fan, comprising a cylindrical housing ( 1 ), a front grid guard ( 3 ) at a front end face of the cylindrical housing ( 1 ), a rear grid guard ( 4 ) at a rear end face of the cylindrical housing ( 1 ) and fan blades ( 2 ) for wind supply, characterized in that the fan blades ( 2 ) are totally or partially disposed outside the rear end face of the cylindrical housing ( 1 ). 
     
     
         2 . The drum fan according to  claim 1 , characterized in that the rear grid guard ( 4 ) is protrudingly provided at a location of the rear end face of the cylindrical housing ( 1 ), and the fan blades ( 2 ) are disposed in the interior of the rear grid guard ( 4 ). 
     
     
         3 . The drum fan according to  claim 1 , characterized in that a rim of the rear end face of the cylindrical housing ( 1 ) is flared into a horn shape. 
     
     
         4 . The drum fan according to  claim 1 , characterized in that a rim of the front end face of the cylindrical housing ( 1 ) is flared into a horn shape. 
     
     
         5 . The drum fan according to  claim 1 , characterized in that both of the rim of the front end face and the rim of rear end face of the cylindrical housing ( 1 ) are flared into a horn shape. 
     
     
         6 . The drum fan according to  claim 2 , characterized in that a rim of the rear end face of the cylindrical housing ( 1 ) is flared into a horn shape. 
     
     
         7 . The drum fan according to  claim 2 , characterized in that a rim of the front end face of the cylindrical housing ( 1 ) is flared into a horn shape. 
     
     
         8 . The drum fan according to  claim 2 , characterized in that both of the rim of the front end face and the rim of rear end face of the cylindrical housing ( 1 ) are flared into a horn shape.