Arrangement for delivering fluids

Abstract

An arrangement for delivering fluids has a fluid pump having a pump wheel ( 90 ), which wheel is joined to a first permanent magnet ( 92 ). The pump wheel ( 90 ) is rotatably arranged inside a liquid-tight pump housing ( 80, 82, 84, 86, 88 ). This housing is shaped, near the first permanent magnet ( 92 ), as a partitioning can ( 80, 82 ). The arrangement also has an electronically commutated electric motor ( 20 ) having a stator ( 22 ) and a rotor ( 26 ) arranged rotatably relative thereto, which rotor comprises a second permanent magnet ( 67 ) that coacts with the first permanent magnet ( 92 ) to act as a magnetic coupling ( 94 ). Arranged in the space between the second permanent magnet ( 67 ) and partitioning can ( 80, 82 ) is a plurality of soft ferromagnetic magnetic flux conductors ( 150 ).

1 . An arrangement for pumping fluids, which comprises:
 a fluid pump having a pump wheel ( 90 ), which wheel is joined to a first permanent magnet ( 92 ), which pump wheel ( 90 ) is rotatably arranged inside a liquid-tight pump housing ( 80 ,  82 ,  84 ,  86 ,  88 ), which housing ( 80 ,  82 ,  84 ,  86 ,  88 ) is implemented, adjacent said first permanent magnet ( 92 ), as a partitioning can ( 80 ,  82 );   an electronically commutated electric motor ( 20 ) having a stator ( 22 ) and a rotor ( 26 ) arranged rotatably relative thereto, which rotor comprises a second permanent magnet ( 67 ) that coacts with the first permanent magnet ( 92 ) to act as a magnetic coupling ( 94 );   and a plurality of soft ferromagnetic magnetic flux conductors ( 150 ;  150 ′;  150 ″) arranged in the space between the second permanent magnet ( 67 ) and the partitioning can ( 80 ,  82 ), which conductors are arranged at a distance from one another in such a way that they map the magnetic field of the second permanent magnet ( 67 ), which field is effective at their end facing away from the partitioning can ( 80 ,  82 ), onto a region of the partitioning can ( 80 ,  82 ) associated with the first permanent magnet ( 92 ).   
   
   
       2 . The arrangement according to  claim 1 , wherein
 the soft ferromagnetic magnetic flux conductors ( 150 ;  150 ′;  150 ″) are implemented as elements made of soft ferromagnetic material, which are arranged in a star configuration around the partitioning can ( 80 ,  82 ).   
   
   
       3 . The arrangement according to  claim 2 , wherein
 the elements ( 150 ;  150 ′;  150 ″) are implemented in substantially plate-shaped fashion from soft ferromagnetic material.   
   
   
       4 . The arrangement according to  claim 1 ,
 wherein   the soft ferromagnetic magnetic flux conductors ( 150 ;  150 ′;  150 ″) are implemented in the manner of flux concentrators.   
   
   
       5 . The arrangement according to  claim 1 , wherein
 the electronically commutated electric motor is implemented as an external-rotor motor ( 20 ) having a rotor cup ( 63 ), inside which cup are arranged the rotor magnet ( 36 ) of the motor ( 20 ) and the second permanent magnet ( 67 ).   
   
   
       6 . The arrangement according to  claim 1 , wherein
 a bearing element ( 106 ) for the pump wheel ( 90 ) is arranged inside the partitioning can ( 80 ,  82 ) on the latter, and   a bearing element ( 30 ) for the rotor ( 26 ) of the electronically commutated electric motor ( 20 ) is arranged outside the partitioning can ( 80 ,  82 ) on the latter.   
   
   
       7 . The arrangement according to  claim 6 , wherein
 the bearing element for the rotor ( 26 ) of the electric motor ( 20 ) comprises a bearing tube ( 30 ) that is fixedly connected to the partitioning can ( 80 ,  82 ).   
   
   
       8 . The arrangement according to  claim 7 , wherein
 the bearing tube ( 30 ) is integrally formed with the partitioning can ( 80 ,  82 ).   
   
   
       9 . The arrangement according to  claim 1 , wherein fan blades ( 64 ) are joined to the rotor ( 26 ) of the electric motor ( 20 ). 
   
   
       10 . The arrangement according to  claim 9 , wherein
 the permanent magnet of the rotor comprises a yoke that is implemented as a cup-like part ( 40 ), and the fan blades ( 64 ) are arranged on this cup-like part ( 40 ).   
   
   
       11 . The arrangement according to  claim 9 , wherein the fan blades ( 64 ) are implemented as part of an axial fan wheel. 
   
   
       12 . The arrangement according to  claim 9 , wherein
 the fan blades are implemented as part of a diagonal fan wheel.   
   
   
       13 . The arrangement according to  claim 9 , wherein
 the fan blades are implemented as part of a radial fan wheel.   
   
   
       14 . The arrangement according to  claim 1 , further comprising
 an air-directing housing ( 68 ) is joined to the partitioning can ( 80 ,  82 ).   
   
   
       15 . The arrangement according to  claim 14 , wherein
 the air-directing housing ( 68 ) is implemented as a plastic part integral with the partitioning can ( 80 ,  82 ).   
   
   
       16 . The arrangement according to  claim 15 , wherein
 the partitioning can ( 80 ,  82 ) is joined to the air-directing housing ( 68 ) via at least one strut ( 114 ).   
   
   
       17 . The arrangement according to  claim 7 , wherein
 the electric motor is implemented as an external-rotor motor ( 20 ); and   the internal stator ( 92 ) of said motor is mounted on the bearing tube ( 30 ), which tube serves for journaling of the rotor ( 26 ).   
   
   
       18 . The arrangement according to  claim 1 , wherein
 the soft ferromagnetic magnetic flux conductors ( 150 ;  150 ′;  150 ″) are joined at their radially inner end regions to a support part ( 160 ) made of non-ferromagnetic material.   
   
   
       19 . The arrangement according to  claim 18 , wherein the support part ( 160 ) is arranged on the partitioning can ( 80 ,  82 ). 
   
   
       20 . The arrangement according to  claim 19 , wherein
 the partitioning can ( 80 ,  82 ) has an approximately cylindrical periphery; and   the support part ( 160 ) is arranged on said periphery.   
   
   
       21 . The arrangement according to  claim 18 , wherein
 the support part ( 160 ) is formed of plastic material, and is equipped with axial projections ( 168 ;  174 ) that are joined by means of a welding operation to an adjacent plastic part of the arrangement.   
   
   
       22 . The arrangement according to  claim 21 , wherein
 the welded join is implemented by ultrasonic welding ( 170 ) at one axial end of the support part ( 160 ).   
   
   
       23 . The arrangement according to  claim 1 ,
 wherein   the cross section of soft ferromagnetic magnetic flux conductors ( 150 ″) inside the support part ( 160 ) is enlarged ( 180 ), at least locally, in order to produce good anchoring of said conductors ( 150 ″) in the support part.