Wet rotor pump comprising a plain bearing

Abstract

A wet rotor pump with an axial flux motor that includes a stator and a rotor. The stator is 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 and the bearing in the axial direction. The bearing is a plain bearing which is used to radially support the impeller and axially support the impeller in one direction as an abutment for the magnetic force of attraction that the stator exerts on the impeller.

1 . A wet rotor pump comprising an axial flux motor, which comprises a stator and a rotor, wherein the stator is disposed in a dry zone and the rotor on an impeller is disposed in a wet zone, having an inlet line for a fluid to be pumped by the impeller, and having 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 stator and the bearing in the axial direction, wherein the bearing is a plain bearing which is used to radially support the impeller and axially support the impeller on one side as an abutment for the magnetic attraction force exerted by the stator onto the impeller;
 wherein the bearing is formed, on the containment-shell side, by a bearing bush disposed in the end region of an inlet connecting piece of the inlet line and, on the impeller side, by a plain-bearing element, which has a sliding surface which engages in the bearing bush; and   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.   
     
     
         2 . (canceled) 
     
     
         3 . (canceled) 
     
     
         4 . The wet rotor pump according to  claim 1 , 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. 
     
     
         5 . 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 (DLC) and silicon carbide (SiC). 
     
     
         6 . The wet rotor pump according to  claim 1 , comprising a containment shell, wherein the containment shell is disposed in the dry zone and the inlet line extends through the containment shell in the axial direction. 
     
     
         7 . The wet rotor pump according to  claim 6 , wherein the inlet line is formed at least by the inlet connecting piece embodied on the containment shell, and by the bearing. 
     
     
         8 . The wet rotor pump according to  claim 7 , 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 as a molded part. 
     
     
         9 . (canceled) 
     
     
         10 . (canceled) 
     
     
         11 . (canceled) 
     
     
         12 . (canceled) 
     
     
         13 . (canceled) 
     
     
         14 . (canceled) 
     
     
         15 . (canceled) 
     
     
         16 . (canceled) 
     
     
         17 . (canceled) 
     
     
         18 . The wet rotor pump according to  claim 1 , wherein the stator is formed in the shape of a torus. 
     
     
         19 . 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. 
     
     
         20 . The wet rotor pump according to  claim 19 , wherein the stator tooth receptacle is bonded with the stator teeth. 
     
     
         21 . The wet rotor pump according to  claim 19 , 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. 
     
     
         22 . The wet rotor pump according to  claim 6 , further 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. 
     
     
         23 . The wet rotor pump according to any one of the preceding  claim 6 , 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 the inlet connecting piece for the inflow of the fluid is formed, wherein an end region of the inlet connecting piece accommodates the bearing. 
     
     
         24 . The wet rotor pump according to  claim 23 , wherein the disk 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.