External extractor fan for exhaust hood

Abstract

An external fan for an extractor device, wherein the external fan includes a fan housing; a ventilator housing that is arranged in the fan housing and that has an air discharge; and a sound absorbing member that is arranged in the fan housing and that is opposite the air discharge of the ventilator housing.

1 . An external fan for an extractor device, the external fan comprising:
 a fan housing;   a ventilator housing arranged in the fan housing, the ventilator housing having an air discharge; and   a sound absorbing member arranged in the fan housing and opposite the air discharge of the ventilator housing.   
     
     
         2 . The external fan of  claim 1 , wherein the sound-absorbing member projects perpendicularly toward the air discharge of the ventilator housing and covers the air discharge completely. 
     
     
         3 . The external fan of  claim 1 , wherein a thickness of the sound-absorbing member varies across a surface of the sound-absorbing member. 
     
     
         4 . The external fan of  claim 3 , wherein the sound-absorbing member is thickest at a point that corresponds to a center of the air discharge of the ventilator housing. 
     
     
         5 . The external fan of  claim 1 , further comprising at least one sound-absorbing lateral part provided in the fan housing, wherein the sound-absorbing lateral part projects perpendicularly toward the air discharge of the ventilator housing outside a surface of the air discharge. 
     
     
         6 . The external fan of  claim 1 , wherein the fan housing has a housing face, wherein the sound-absorbing member completely covers the housing face of the fan housing, and wherein the housing face is arranged opposite the air discharge of the ventilator housing. 
     
     
         7 . The external fan of  claim 6 , wherein the fan housing has air outlet openings at at least one of the housing face arranged opposite the air discharge of the ventilator housing and adjacent housing faces. 
     
     
         8 . The external fan of  claim 1 , wherein the sound-absorbing member has a partition wall that extends perpendicularly to an elevation in the sound-absorbing member. 
     
     
         9 . The external fan of  claim 8 , wherein the sound-absorbing member has two shells. 
     
     
         10 . The external fan of  claim 1 , wherein the sound-absorbing member is rotationally symmetrical in shape. 
     
     
         11 . The external fan of  claim 1 , wherein a distance between a highest point of the sound-absorbing member and the air discharge is at most one third of a diameter of the air discharge. 
     
     
         12 . The external fan of  claim 11 , wherein the distance is at most one quarter of the diameter of the air discharge. 
     
     
         13 . The external fan of  claim 1 , wherein the fan housing has two parts; wherein one of the two parts of the fan housing receives the sound-absorbing member; and wherein the one of the two parts has at least one air outlet opening in the fan housing. 
     
     
         14 . The external fan of  claim 1 , wherein the sound-absorbing member is made of foamed material.