Wet rotor pump comprising power electronics

Abstract

A wet rotor pump with an axial flux motor that includes a stator, a containment shell, and a rotor. The stator and the containment shell are arranged in a dry zone while the rotor on an impeller is arranged in a wet zone. The wet rotor pump further has an inlet line for a fluid to be pumped by the impeller, said inlet line extending through the stator and the containment shell in an axial direction, and power electronics for controlling the stator, said power electronics being arranged within the space delimited by the stator and the containment shell.

1 . A wet rotor pump comprising an axial flux motor having a stator, a containment shell, and a rotor, wherein the stator and the containment shell are disposed in a dry zone and the rotor on an impeller is disposed in a wet zone, comprising an inlet line for a fluid to be pumped by the impeller, wherein the inlet line extends through the stator and the containment shell in the axial direction, and comprising power electronics for controlling the stator, wherein the power electronics are disposed in the interior of the space circumscribed between the stator and the containment shell. 
     
     
         2 . The wet rotor pump according to  claim 1 , wherein the power electronics are disposed on an annular printed circuit board, and wherein the inlet line extends through the printed circuit board in the axial direction. 
     
     
         3 . The wet rotor pump according to  claim 1 , wherein the containment shell comprises a disk, wherein the disk has a central opening, on which an inlet connecting piece for the inflow of the fluid is formed, wherein the disk has recesses, along the periphery thereof, for accommodating the air-gap side ends of the stator teeth, wherein an outer radius of the printed circuit board is limited by the recesses and an inner radius of the printed circuit board is limited by a wall of the inlet connecting piece, which is formed by the containment shell and extends in the axial direction. 
     
     
         4 . The wet rotor pump according to  claim 1 , comprising a bearing for the impeller, wherein the bearing is disposed at one end of the inlet line, and the bearing supports the impeller in such a way that the impeller has one axial degree of freedom, wherein the inlet line extends through the bearing in the axial direction. 
     
     
         5 . The wet rotor pump according to  claim 4 , wherein the inlet line is formed at least by an inlet connecting piece embodied on the containment shell, and by the bearing. 
     
     
         6 . The wet rotor pump according to  claim 5 , wherein the containment shell comprises a disk, which extends into the air gap of the axial flux motor, and the containment shell is designed as a single piece, in particular as a molded part. 
     
     
         7 . The wet rotor pump according to  claim 1 , wherein the stator is formed in the shape of a torus. 
     
     
         8 . The wet rotor pump according to  claim 1 , wherein the stator is formed by an annular stator tooth receptacle, along the periphery of which stator teeth are attached. 
     
     
         9 . The wet rotor pump according to  claim 8 , wherein the stator tooth receptacle is bonded with the stator teeth. 
     
     
         10 . The wet rotor pump according to  claim 8 , wherein each of the stator teeth comprises a receiving region for a coil, which said receiving region extends in the axial direction and is limited by an air-gap side end of the particular stator tooth, wherein the air-gap side end of the stator tooth has an end face, which is greater than the cross section of the receiving region. 
     
     
         11 . The wet rotor pump according to  claim 1 , wherein the containment shell comprises a disk, which extends into the air gap, wherein the disk has a central opening, on which an inlet connecting piece for the inflow of the fluid is formed, wherein an end region of the inlet connecting piece accommodates the bearing. 
     
     
         12 . The wet rotor pump according to  claim 1 , wherein the bearing is a plain bearing, which is designed to radially support the impeller and to axially support the impeller on one side as an abutment for the magnetic attraction force exerted by the stator onto the impeller. 
     
     
         13 . The wet rotor pump according to  claim 12 , wherein the bearing is formed, on the containment-shell side, by a bearing bush disposed in the end region of the inlet connecting piece and, on the impeller side, by a plain-bearing element, which has a sliding surface, which engages into the bearing bush. 
     
     
         14 . The wet rotor pump according to  claim 13 , wherein the plain-bearing element has a circumferential edge, which is disposed so as to form a stop at the bearing bush when a magnetic attraction force from the stator acts on the rotor in the axial direction. 
     
     
         15 . The wet rotor pump according to  claim 14 , wherein the plain-bearing element comprises one or more openings, which extend in the radial direction and are designed such that, during operation, a portion of the fluid flow is directed between the sliding surface of the plain-bearing element and the sliding surface of the bearing bush. 
     
     
         16 . The wet rotor pump according to  claim 1 , wherein the sliding surface of the plain-bearing element and/or the sliding surface of the bearing bush is coated with a combination of diamond-like carbon and silicon carbide. 
     
     
         17 . The wet rotor pump according to  claim 1 , wherein the bearing is a combination of a plain bearing and a rolling bearing, which are designed to provide radial and axial support of the impeller, wherein the rolling bearing functions as an abutment in the axial direction for the magnetic attraction force exerted by the stator onto the impeller, and the plain bearing supports the rotor in the radial direction. 
     
     
         18 . The wet rotor pump according to  claim 17 , wherein the rolling bearing is formed of bearing shells, which have a running surface for accommodating rolling elements, and rolling elements, wherein a first bearing shell is attached to the impeller and a second bearing shell is attached to the containment shell, and the rolling elements are located in the space circumscribed by the running surfaces of the two bearing shells. 
     
     
         19 . The wet rotor pump according to  claim 17 , wherein the plain bearing is formed, on the impeller side, by the outer jacket surface of the first bearing shell and the jacket surface of the containment shell and, on the containment-shell side, by the inner jacket surface of the second bearing shell and the jacket surface of the impeller. 
     
     
         20 . The wet rotor pump according to  claim 17 , wherein the running surfaces and/or the jacket surfaces of the bearing shells and/or the rolling elements are coated with silicon carbide and/or diamond-like carbon and/or silicon-doped DLC. 
     
     
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