Ventilation unit

Abstract

A ventilation unit for generating an air flow comprises a centrifugal rotor able to rotate about an axis of rotation, a diffuser comprising a first and a second outlet, the outlets being positioned on opposite sides of the centrifugal rotor and delimiting a blowing duct; the centrifugal rotor is inserted in the blowing duct and is aligned with the first outlet and with the second outlet according to a main axis which is perpendicular to the axis of rotation.

1 . A ventilation unit for generating an air flow comprising
 a centrifugal rotor able to rotate about an axis of rotation,   a diffuser associated with the centrifugal rotor, comprising a first and a second outlet, the outlets being positioned on opposite sides of the centrifugal rotor and delimiting a flow blowing duct, the centrifugal rotor being inserted in the blowing duct,   said ventilation unit being characterised in that   the centrifugal rotor, the first outlet and the second outlet are aligned with each other according to a main axis which is perpendicular to the axis of rotation.   
     
     
         2 . The ventilation unit according to  claim 1 , wherein the diffuser comprises means for guiding the air flow in the blowing duct, said guide means operating between the centrifugal rotor and the first outlet and/or between the centrifugal rotor and the second outlet. 
     
     
         3 . The ventilation unit according to  claim 2 , wherein the guide means comprise a first flow diverter, forming a first narrowing in the duct, positioned in said blowing duct between the rotor and the first outlet, and a second flow diverter forming a second narrowing in the duct and positioned in the blowing duct between the rotor and the second outlet, said first and second flow diverters being positioned on opposite sides of the rotor. 
     
     
         4 . The ventilation unit according to  claim 3 , wherein the first and second flow diverters each have a first face which is curved, with the concavity facing towards the rotor. 
     
     
         5 . The ventilation unit according to  claim 4 , wherein the first face of the first and second flow diverters is formed by a portion of a cylindrical surface having a main axis which coincides with the axis of rotation. 
     
     
         6 . The ventilation unit according to  claim 3 , wherein the first and second flow diverters each comprise a second face which is curved, with the concavity respectively facing towards the first outlet and towards the second outlet, and a cusp connecting the first face and the second face. 
     
     
         7 . The ventilation unit according to  claim 3 , wherein the rotor is of the radial type with vanes having tips pointing backwards, said first and second flow diverters being positioned in the blowing duct in such a way that during generation of the air flow said tips encounter, one after another, the first flow diverter, the second narrowing, the second flow diverter and the first narrowing. 
     
     
         8 . The ventilation unit according to  claim 1 , wherein the diffuser has a central symmetry, the centre of symmetry belonging to the axis of rotation.