Pump driven by an electromotor and method for producing a pump of this type

Abstract

The invention relates to a pump ( 10 ), having a pump head ( 12 ), which has a pump chamber ( 11 ), and having an electric motor ( 14 ), which drives the pump head ( 12 ) and has a stator ( 40 ) and a rotor ( 38 ), the rotor ( 38 ) being connected to the pump head ( 12 ) and being disposed in a rotor chamber ( 82 ) open toward the pump chamber ( 11 ). It is proposed that the stator ( 40 ) is disposed radially around the rotor chamber ( 82 ), and the rotor chamber ( 82 ) is sealed off from the pump chamber ( 11 ) by a sealing wall ( 51 ) belonging to the stator ( 40 ) and by at least one wall ( 64 ) of the pump housing ( 18 ).

1 . A pump, having a pump head ( 12 ), which has a pump chamber ( 11 ), having an electric motor ( 14 ), which drives the pump head ( 12 ) and has a stator ( 40 ) and a rotor ( 38 ), the rotor ( 38 ) being connected to the pump head ( 12 ) and being disposed in a rotor chamber ( 82 ) open toward the pump chamber ( 11 ), characterized in that the stator ( 40 ) is disposed radially around the rotor chamber ( 82 ), and the rotor chamber ( 82 ) is sealed off from the pump chamber ( 11 ) by a sealing wall ( 51 ) belonging to the stator ( 40 ) and by at least one wall ( 64 ) of the pump housing ( 18 ).  
     
     
         2 . The pump of  claim 1 , characterized in that the pump head ( 12 ), electric motor ( 14 ) and an electronic switch mechanism ( 16 ) for controlling the electric motor ( 14 ) are disposed in a common, in particular three-part pump housing ( 18 ).  
     
     
         3 . The pump of  claim 1  or  2 , characterized in that at least one wall ( 64 ) defining the rotor chamber ( 82 ) is embodied integrally with a motor housing ( 34 ) of the electric motor ( 14 ).  
     
     
         4 . The pump of  claim 3 , characterized in that the sealing wall ( 51 ) defining the rotor chamber ( 82 ) radially and belonging to the stator ( 40 ) seals off the rotor chamber ( 82 ) via elastic sealing means ( 66 ).  
     
     
         5 . The pump of one of the foregoing claims, characterized in that the sealing wall ( 51 ) defining the rotor chamber ( 82 ) radially is solidly connected to the stator ( 40 ).  
     
     
         6 . The pump of  claim 5 , characterized in that the sealing wall ( 51 ) is formed by a casing ( 50 ) of the stator ( 40 ), the casing being completely closed in the circumferential direction of the rotor chamber ( 82 ).  
     
     
         7 . The pump of  claim 6 , characterized in that the casing ( 50 ) of the stator ( 40 ), the casing being completely closed in the circumferential direction of the rotor chamber ( 82 ), is of plastic.  
     
     
         8 . The pump of  claim 6  or  7 , characterized in that pole teeth ( 44 ) of the stator ( 40 ) are injected into the casing ( 50 ) of the stator ( 40 ).  
     
     
         9 . The pump of  claim 7  or  8 , characterized in that the plastic casing ( 50 ) of the stator ( 40 ) is shaped such that it serves as a winding body ( 54 ) for stator windings ( 56 ).  
     
     
         10 . The pump of one of the foregoing claims, characterized in that the stator ( 40 ) is connected to the wall ( 64 ) of the motor housing ( 34 ).  
     
     
         11 . The pump of one of the foregoing claims, characterized in that at least one wall ( 64 ) enclosing the switch mechanism ( 16 ) is embodied integrally with the motor housing ( 34 ).  
     
     
         12 . The pump of one of the foregoing claims, characterized in that at least one electronic component ( 96 ) of the switch mechanism ( 16 ) is disposed on a cooling wall ( 65 ) that is cooled by a pumping medium.  
     
     
         13 . The pump of claims  11  and  12 , characterized in that the cooling wall ( 65 ) is one wall ( 64 ) of the motor housing ( 34 ).  
     
     
         14 . The pump of  claim 12  or  13 , characterized in that a volumetric flow of the pumping medium flows from the compression side of the pump head ( 12 ) past the cooling wall ( 65 ) to the intake side of the pump head ( 12 ).  
     
     
         15 . The pump of one of the foregoing claims, characterized in that the electronic switch mechanism ( 16 ) is mounted on the opposite end of the motor housing ( 34 ) from the pump head ( 12 ).  
     
     
         16 . The pump of one of the foregoing claims, characterized in that the shaft of the electric motor ( 14 ) is simultaneously the drive shaft ( 20 ) of the pump head ( 12 ).  
     
     
         17 . The pump of  claim 16 , characterized in that the pumping medium flows through a conduit ( 92 ) in the drive shaft ( 20 ) of the motor ( 14 ) to the intake side.  
     
     
         18 . The pump of one of the foregoing claims, characterized in that the electric motor ( 14 ) is an electronically commutated direct-current motor.  
     
     
         19 . The pump of one of the foregoing claims, characterized in that the pump is water pump for use in motor vehicles.  
     
     
         20 . A method for producing a pump ( 10 ), in particular a fluid pump for the coolant or heating loop of a motor vehicle, in which the pump ( 10 ) has a pump head ( 12 ) and an electric motor ( 14 ) with a stator ( 40 ) and a rotor ( 38 ), characterized in that the stator ( 40 ) of the electric motor ( 14 ) that drives the pump head ( 12 ) is produced by spray-coating stator pole teeth ( 44 ), in particular with a plastic; and that upon injection of the stator pole teeth ( 44 ) into the plastic, the plastic casing ( 50 ) is shaped such that the stator pole teeth ( 44 ) come to be seated in a manner secure against relative rotation and firmly in the plastic casing ( 50 ); the plastic casing ( 50 ) is shaped as a carrier ( 54 ) of the stator windings ( 56 ); and the plastic casing ( 50 ) can seal off the stator ( 40 ) from the rotor chamber ( 82 ) of the electric motor ( 14 ), which rotor chamber is open toward the pumping medium.