Rotary pump comprising a hydraulically mounted rotor

Abstract

The invention relates to a pump for moving blood and other shear-sensitive with a rotor journaled hydraulically and, if necessary, magnetically in a housing and where the rotor ( 1 ) has flow-control surfaces ( 2, 4, 35, 33, 37, 41 ) for producing centrifugal flow components ( 3 ) and flow components ( 4 ) directed against the housing ( 30 ), the centrifugal flow components ( 3 ) serving mainly for producing the externally effective throughput and the flow components ( 5 ) directed against the housing serving mainly for contact-free journaling and stabilizing of the rotor in the housing.

1 . A rotary pump for moving blood and other shear-sensitive liquids and having a rotor journaled hydraulically and if necessary magnetically in a housing, characterized in that the rotor ( 1 ) has flow-control surfaces ( 2 ,  4 ,  35 ,  33 ,  37 ,  41 ) for producing centrifugal flow components ( 3 ) and flow components ( 4 ) directed against the housing ( 30 ), the centrifugal flow components ( 3 ) serving mainly for producing the externally effective throughput and the flow components ( 5 ) directed against the housing serving mainly for contact free journaling and stabilizing of the rotor in the housing.  
     
     
         2 . The pump according to  claim 1 , characterized in that the housing ( 30 ) has a conical central part ( 16 ) and/or a hollow conical upper part ( 15 ) and that the rotor ( 1 ) arranged between them is conical.  
     
     
         3 . The pump according to  claim 1  or  2 , characterized in that the flow-control surfaces are formed as vanes ( 2  and  4 ) on a conical inner and/or outer surface of the rotor.  
     
     
         4 . The pump according to one of  claims 1  to  3 , characterized in that the rotor ( 1 ) has flow-through rotor holes ( 18 ) on which the flow-control surfaces ( 2 ,  4 ,  35 ,  33 ,  37 ,  41 ) are mounted.  
     
     
         5 . The pump according to one of  claims 1  to  4 , characterized in that edges of the rotor holes ( 18 ) are beveled to form flow-control surfaces ( 35  and  37 ).  
     
     
         6 . The pump according to one of  claims 1  to  5 , characterized in that the rotor holes ( 18 ) extend to a lower edge ( 41 ) of the conical sleeve and the lower edge ( 41 ) if necessary is formed as flow-control surfaces for producing a drive component.  
     
     
         7 . The pump according to one of  claims 1  to  6 , characterized in that the rotor ( 1 ) is formed of two nested conical sleeves ( 31  and  32 ) between which extend vanes serving as flow-control surfaces ( 33 ) for producing the centrifugal flow components ( 3 ) and that the two conical sleeves ( 31  and  32 ) have rotor openings ( 18 ) and selectively vanes ( 4 ) for producing the flow components ( 5 ) directed against the housing.  
     
     
         8 . The pump according to one of  claims 1  to  7 , characterized in that the rotor ( 1 ) has at an inlet ( 13 ) and inlet opening ( 36 ) in order to direct a portion of the incoming liquid against a point of the conical central part ( 16 ) of the housing ( 30 ).  
     
     
         9 . The pump according to one of the preceding claims, characterized in that in the region of the lower edge ( 41 ) the rotor ( 1 ) is provided with a plurality of rotor magnets ( 6 ) or a magnetic ring that cooperates with magnets ( 10 ,  12 ) in the housing ( 30 ) and/or with a magnetic drive.  
     
     
         10 . The pump according to  claim 9 , characterized in that the magnetic drive is formed by a stator ( 8 ,  12 ) with a surrounding magnetic field.  
     
     
         11 . The pump according to  claim 9 , characterized in that the magnetic drive is formed by a disk rotor, a stator ( 38 ) being provided with a rotating disk ( 24 ) with imbedded magnets ( 10 ) or multiple magnetized regions.  
     
     
         12 . The pump according to one of  claims 1  to  11 , characterized in that the rotor magnets ( 6 ) and the magnetic-force producing portions of the drive motor ( 8 ,  11 ,  12 ) are offset axially such that the produce on the rotor ( 1 ) in addition to rotation energy a force component effective axially ans serving to journal and/or stabilize th rotor ( 1 ).  
     
     
         13 . The pump according to one of  claims 1  to  12 , characterized in that in addition to the drive a ring ( 27 ) of ferromagnetic iron or permanent-magnet material is provided around the inlet ( 13 ) and in the adjacent housing parts permanent or electromagnets ( 22 ,  23 ,  28 ) are provided for additional magnetic. stabilization, and that preferably to control this magnets additional sensors ( 42 ) are provided for determining the exact position of the rotor ( 1 ) (FIG. 4).  
     
     
         14 . The pump according to one of  claims 1  to  13 , characterized in that the ring ( 27 ) of ferromagnetic iron around the inlet ( 13 ) has a highly conductive surface coating ( 34 ), so that eddy currents and magnetic fields therein center the rotor ( 1 ).  
     
     
         15 . The pump according to one of  claims 1  to  14 , characterized in that in order to rotate and stabilize the rotor ( 1 ) a peripheral external stator ( 8 ) and an internal either stator ( 12 ) or motor ( 26 ) or a disk-rotor motor ( 24 ,  29 ) with a magnetic disk ( 11 ,  24 ) is provided, the internal components ( 12 ,  26 ,  29 ,  11 ,  24 ) preferably being effective to produce the rotation energy and the external stator for stabilizing the rotor ( 1 ).