Wet rotor pump

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, and a bearing for the impeller. Said bearing is arranged at one end of the inlet line and supports the impeller in such a way that the impeller has an axial degree of freedom. The inlet line extends through the stator, the containment shell, and the bearing in the axial direction.

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, and a bearing for the impeller, wherein the bearing is disposed at one end of the inlet line and supports the impeller such that said impeller has one axial degree of freedom, wherein the inlet line extends through the stator, the containment shell, and the bearing in the axial direction, wherein the stator is formed by an annular stator tooth receptacle, along the periphery of which stator teeth are attached. 
     
     
         2 . The wet rotor pump according to  claim 1 , wherein the inlet line is formed at least by an inlet connecting piece embodied on the containment shell, and by the bearing. 
     
     
         3 . The wet rotor pump according to  claim 1 , 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. 
     
     
         4 . (canceled) 
     
     
         5 . (canceled) 
     
     
         6 . (canceled) 
     
     
         7 . The wet rotor pump according to  claim 1 , 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. 
     
     
         8 . The wet rotor pump according to  claim 1 , 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. 
     
     
         9 . The wet rotor pump according to  claim 1 , wherein the containment shell comprises a disk, which extends into the air gap of the axial flux motor, 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. 
     
     
         10 . 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. 
     
     
         11 . The wet rotor pump according to  claim 10 , 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. 
     
     
         12 . The wet rotor pump according to  claim 11 , 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. 
     
     
         13 . The wet rotor pump according to  claim 12 , 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. 
     
     
         14 . (canceled) 
     
     
         15 . (canceled) 
     
     
         16 . (canceled) 
     
     
         17 . (canceled) 
     
     
         18 . (canceled) 
     
     
         19 . The wet rotor pump according to  claim 1 , wherein the bearing is a combination of a plain bearing and a magnetic bearing, which are designed to provide radial and axial support of the impeller, wherein the magnetic 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. 
     
     
         20 . The wet rotor pump according to  claim 19 , wherein the magnetic bearing is formed by magnetic rings, wherein a first magnetic ring is attached to the impeller and a second magnetic ring is attached to the containment shell, and the magnetization of the magnetic rings is configured such that said magnetic rings repel one another in the axial direction in the installed state in the wet rotor pump. 
     
     
         21 . The wet rotor pump according to  claim 20 , wherein the plain bearing is formed, on the impeller side, by the outer jacket surface of the first magnetic ring and the jacket surface of the containment shell and, on the containment-shell side, by the inner jacket surface of the second magnetic ring and the jacket surface of the impeller. 
     
     
         22 . The wet rotor pump according to  claim 19 , wherein the jacket surfaces of the magnetic rings are coated with silicon carbide (SiC) and/or diamond-like carbon (DLC) and/or silicon-doped DLC. 
     
     
         23 . The wet rotor pump according to  claim 19 , wherein the bearing is protected by a fine-strand filter against particles entering the bearing. 
     
     
         24 . The wet rotor pump according to  claim 9 , wherein the disk of the containment shell has recesses, along the periphery thereof, for accommodating the air-gap side ends of the stator teeth. 
     
     
         25 . The wet rotor pump according to  claim 1 , wherein the rotor contains samarium cobalt (SmCo). 
     
     
         26 . The wet rotor pump according to  claim 1 , wherein the rotor is formed by a plurality of permanent magnets disposed on the periphery of the impeller, or by a magnetic ring having multipolar magnetization. 
     
     
         27 . The wet rotor pump according to  claim 1 , wherein a seal is formed by the bearing. 
     
     
         28 . The wet rotor pump according to  claim 1 , wherein the permanent magnets are shorter in the radial direction than the ends of the stator teeth.