Eccentric Screw Pump With Integrated Drive

Abstract

The invention relates to an eccentric screw pump which includes a stator and a rotor rotating therein as well as a drive motor for driving the rotor. The armature of the drive motor is non-rotationally linked with the rotor and rotates inside a cylindrical pot on an eccentric orbit. The torque for driving the rotor is generated by means of a stator winding.

1 . An eccentric screw pump, comprising a stator and a rotor running therein, as well as a drive motor for driving the rotor which is connected to the rotor, comprising a stator winding, an armature which is constructed as an approximately cylindrical armature and rotates on an eccentric orbit inside an approximately cylindrical pot, on which the stator winding is arranged, wherein the armature and the rotor are rigidly connected.  
   
   
       2 . The eccentric screw pump according to  claim 1 , characterised in that a second armature is arranged as an approximately cylindrical armature on the end of the rotor opposite to the first armature and rotates on an eccentric orbit inside an approximately cylindrical pot on which the second stator winding is arranged.  
   
   
       3 . The eccentric screw pump according to  claim 1 , characterised in that a plurality of rotors each having a following armature are arranged in a chain of armatures and rotors.  
   
   
       4 . The eccentric screw pump according to  claim 1 , characterised in that permanent magnets, reluctance magnets or soft magnetic materials are provided in the armature.  
   
   
       5 . The eccentric screw pump according to  claim 1 , characterised in that a control unit is provided which controls the corresponding parts of the stator winding depending on the position of the armature in such a manner that a torque is exerted on the rotor, wherein the magnetic flux is preferably guided through those areas of the pot which have a minimal distance from the surface of the armature.  
   
   
       6 . The eccentric screw pump according to  claim 1 , characterised in that the armature has holes through which the medium can flow.  
   
   
       7 . The eccentric screw pump according to  claim 1 , characterised in that in the armature permanent magnets and furthermore coils are arranged in such a manner that a pre-determined axial force is exerted on the rotor.  
   
   
       8 . The eccentric screw pump according to  claim 1 , characterised in that in the armature permanent magnets or coils are arranged in groups wherein the axial forces of the individual groups act on the rotor in preferably opposite directions.  
   
   
       9 . The eccentric screw pump according to  claim 7 , characterised in that the rotor can be displaced by the axial force in the axial direction.  
   
   
       10 . The eccentric screw pump according to  claim 7 , characterised in that an additional axial force is exerted or an additional axial movement is executed to reduce the break-away torque when starting up the pump.  
   
   
       11 . The eccentric screw pump according to  claim 7 , characterised in that an additional axial movement is used to close the pump outlet or to actuate a valve body.  
   
   
       12 . The eccentric screw pump according to  claim 1 , characterised in that an additional axial movement is used to close the pump outlet or to actuate a valve body.