Electrically driven pump and domestic appliance having the pump

Abstract

A pump includes a pump chamber in which an impeller and a rotor of an electric machine connected to the impeller, are disposed. A flow path runs from an inlet to an outlet of the pump chamber through a central passage of the rotor.

1 . A pump, comprising: 
 a pumping chamber having an inlet and an outlet ( 14 );    a stationary shaft;    an impeller disposed in said pumping chamber and rotatable about said stationary shaft;    a rotor of an electrical machine, said rotor connected to said impeller, disposed in said pumping chamber and rotatable about said stationary shaft, said rotor having a central through-passage through which a flow path from said inlet to said outlet runs; and    at least one annular bearing mounting said impeller on said stationary shaft and rotating with said impeller, said at least one annular bearing having an inner surface with at least one axial channel.    
   
   
       2 . The pump according to  claim 1 , wherein said at least one annular bearing has a first section engaging in a central hole in said impeller, and a second section disposed outside said central hole in said impeller and having an outside diameter greater than an outside diameter of said first section.  
   
   
       3 . The pump according to  claim 1 , wherein said at least one annular bearing is two annular bearings inserted into a central hole in said impeller from opposite ends.  
   
   
       4 . The pump according to  claim 1 , wherein said stationary shaft has an inlet-side end, and a washer is fitted to and rotationally fixed relative to said inlet-side end of said stationary shaft.  
   
   
       5 . The pump according to  claim 1 , wherein said impeller has a rotary axis oriented vertically in an installation position of the pump.  
   
   
       6 . The pump according to  claim 5 , wherein said inlet is positioned higher than said outlet.  
   
   
       7 . A domestic appliance, comprising a pump according to  claim 1 .  
   
   
       8 . A dishwasher, comprising a pump according to  claim 1.