Fan arrangement

Abstract

A fan arrangement ( 10 ) has a first axial fan ( 20 ), a second axial fan ( 40 ), and a guide apparatus ( 60 ). The first axial fan has: a first electric motor ( 21 ) having a first external rotor ( 22 ) and a first internal stator ( 23 ); a first fan wheel ( 24 ) connected to the first external rotor and having a first plurality of fan blades ( 25 ); a first base part ( 26 ) connected to the first internal stator; and a first fan housing ( 27 ) that at least partly surrounds the first electric motor. The second axial fan has: a similar structure. The first fan housing defines, together with the first fan wheel, an annular first conduit ( 32 ) through which a fluid is deliverable during operation by rotation of the first fan wheel around a first rotation axis ( 30 ) of the first external rotor. The second fan housing defines, together with the second fan wheel, an annular second conduit ( 52 ) through which the fluid is deliverable, during operation, by rotation of the second fan wheel around a second rotation axis ( 50 ) of the second external rotor.

1 . A fan arrangement comprising
 a first axial fan ( 20 ), a second axial fan ( 40 ), and a guide apparatus ( 60 ),
 the first axial fan ( 20 ) including: 
   a first electric motor ( 21 ) having a first external rotor ( 22 ) and   a first internal stator ( 23 );   a first fan wheel ( 24 ) connected to the first external rotor ( 22 ) and having a first plurality of fan blades ( 25 );   a first base part ( 26 ) connected to the first internal stator ( 23 );   and a first fan housing ( 27 ), which first fan housing ( 27 ) at least partly surrounds the first electric motor ( 21 ); and
 the second axial fan ( 40 ) including: a second electric motor ( 41 ) having a second external rotor ( 42 ) and a second internal stator ( 43 ); a second fan wheel ( 44 ) connected to the second external rotor ( 42 ) and having a second plurality of fan blades ( 45 ); a second base part ( 46 ) connected to the second internal stator ( 43 ); and a second fan housing ( 47 ), which second fan housing ( 47 ) at least partly surrounds the second electric motor ( 41 ); 
 the first fan housing ( 27 ) defining, together with the first fan wheel ( 24 ), an annular first conduit ( 32 ) through which a fluid is deliverable during operation by rotation of the first fan wheel ( 24 ) around a first rotation axis ( 30 ) of the first external rotor ( 22 );
 the second fan housing ( 47 ) defining, together with the second fan wheel ( 44 ), an annular second conduit ( 52 ) through which the fluid is deliverable during operation by rotation of the second fan wheel ( 44 ) around a second rotation axis ( 50 ) of the second external rotor ( 42 ); and 
 
 the guide apparatus ( 60 ) including a guide apparatus housing ( 61 ) and a guide apparatus inner part ( 63 ) connected to the guide apparatus housing ( 61 ) with the aid of webs ( 62 ), which guide apparatus housing ( 61 ) defines, together with the guide apparatus inner part ( 63 ), an annular third conduit ( 64 ) through which the fluid is deliverable; 
 the first base part ( 26 ) being attached to a first portion ( 68 ) of the guide apparatus inner part ( 63 ) and the second base part ( 46 ) being attached to a second portion ( 69 ) of the guide apparatus inner part ( 63 ); and 
 the first axial fan ( 20 ), the second axial fan ( 40 ), and the guide apparatus ( 60 ) being connected to one another in such a way that the first annular conduit ( 32 ), the second annular conduit ( 52 ), and the third annular conduit ( 64 ) collectively form a flowthrough-capable air conduit ( 13 ) of the fan arrangement ( 10 ). 
   
     
     
         2 . The fan arrangement according to  claim 1 , wherein a longitudinal axis ( 67 ) of the guide apparatus ( 60 ), the first rotation axis ( 30 ), and the second rotation axis ( 50 ) are implemented coaxially. 
     
     
         3 . The fan arrangement according to  claim 1 , wherein the guide apparatus inner part ( 63 ) comprises guide vanes on a lateral surface ( 631 ), configured to face toward the guide apparatus housing ( 61 ). 
     
     
         4 . The fan arrangement according to  claim 1 , wherein the webs ( 62 ) are implemented in the form of guide vanes. 
     
     
         5 . The fan arrangement according to  claim 1 , wherein, the guide apparatus ( 60 ) is rigidly coupled to at least one of the first internal stator ( 23 ) and the second internal stator ( 43 ). 
     
     
         6 . The fan arrangement according to  claim 1 , wherein,
 the first base part ( 26 ) is configured to position the first internal stator ( 23 ) and a first bearing arrangement ( 28 ) with respect to a first central shaft ( 29 ) of the first electric motor ( 21 ), and   the second base part ( 46 ) is configured to position the second internal stator ( 43 ) and a second bearing arrangement ( 48 ) with respect to a second central shaft ( 49 ) of the second electric motor ( 41 ).   
     
     
         7 . The fan arrangement according to  claim 6 , wherein, the first base part ( 26 ) abuts in an axial direction against the first portion ( 68 ), and the second base part ( 46 ) abuts in an axial direction against the second portion ( 69 ). 
     
     
         8 . The fan arrangement according to  claim 6 , wherein, the first base part ( 26 ) abuts in a radial direction against the first portion ( 68 ), and/u, the second base part ( 46 ) abuts in a radial direction against the second portion ( 69 ). 
     
     
         9 . The fan arrangement according to  claim 1 , wherein, the guide apparatus inner part ( 63 ) is formed with a disk-shaped region ( 71 ) that serves as an axial stop at least for the first base part ( 26 ). 
     
     
         10 . The fan arrangement according to  claim 9 , wherein the disk-shaped region ( 71 ) is integrally formed with a tubular portion ( 73 ). 
     
     
         11 . The fan arrangement according to  claim 1 , wherein at least one of the first fan housing ( 27 ) and the second fan housing ( 47 ) is immovably connected to the guide apparatus housing ( 61 ). 
     
     
         12 . The fan arrangement according to  claim 1 , wherein at least one of the first base part ( 26 ) and the second base part ( 46 ) is connected to a respective adjacent portion ( 68 , 69 ) via a press fit. 
     
     
         13 . The fan arrangement according to  claim 1 , wherein the guide vanes ( 62 ) are so shaped that, during fan operation, they straighten the fluid in the air conduit ( 13 ). 
     
     
         14 . The fan arrangement according to  claim 1 , wherein, the air conduit ( 13 ) is formed with a Venturi tube constriction. 
     
     
         15 . The fan arrangement according to  claim 1 , wherein, during operation, the first axial fan ( 20 ) has a first rotation direction ( 31 ) and the second axial fan ( 40 ) has a second rotation direction ( 51 ), directed oppositely to the first rotation direction ( 31 ). 
     
     
         16 . The fan arrangement according to  claim 1 , further comprising
 a third axial fan ( 40 ′,  40 ″), which is connected via a further guide apparatus ( 60 ′) to one of the first fan ( 20 ) and the second fan ( 40 ).   
     
     
         17 . The fan arrangement according to  claim 16 , further comprising
 a fourth axial fan ( 40 ″), which is connected via a further guide apparatus ( 60 ″) to the third axial fan ( 40 ′).   
     
     
         18 . The fan arrangement according to  claim 2 , wherein
 the guide apparatus inner part ( 63 ) comprises guide vanes on a lateral surface ( 631 ), configured to face toward the guide apparatus housing ( 61 ).