Magnetically coupled canned rotary pump

A pump comprising:

• a housing plate having a front face and a back face;
• a housing can fixed to the plate and defining a chamber on the back face thereof;
• a bearing sleeve in the can fixed to the plate and extending rearward from the back face thereof along an axis;
• a rotor shaft extending axially through the sleeve and having a front end and a rear end;
• bearings supporting the rotor shaft in the sleeve for rotation therein about the axis;
• an impeller on the rotor-shaft front end in a pump chamber at the front face of the housing plate;
• a rotor body fixed to the shaft rear end and extending axially forward in the can around the bearing sleeve, the rotor body defining an annular space around the bearing sleeve and being formed with at least one axially throughgoing passage open axially forward into the space and axially rearward into the can;
• and
• means including a vane in the passage angled for pumping liquid from inside the can axially forward into the space on rotation of the rotor about the axis.