A pump comprising: a motor-driven drive rotor having a magnetic rim; a magnetic rotor; plastic cup-shaped housing covering the magnetic rotor and being disposed within a circumference of the rim, the magnetic rotor being selectively magnetically coupled with the drive rotor for rotation therewith; ceramic pump shaft having one end that is torsionally connected to the magnetic rotor and another end torsionally connected to an impeller; and bearing arrangement consisting of: first and second ceramic plain bearing bushes in which said pump shaft is radially and axially seated in a back pump part, the first plain bearing bush being disposed near the impeller and forming a first exposed end journal bearing face for axially bearing against the impeller, the second plain bearing bush being disposed near the magnetic rotor and forming a second exposed end journal bearing face for axially bearing against the magnetic rotor; Ball Valvesa ceramic impeller bush including an exposed, first axial bearing surface facing toward the first end journal bearing face being connected to the impeller, the impeller bush being secured against rotational movement relative to the impeller; a ceramic rotor bush including an exposed, second axial bearing surface facing toward the second end journal bearing face being connected to the magnetic rotor, the magnetic rotor bush being is secured against rotational movement relative to the magnetic rotor; whereby the cup-shaped housing, the impeller and of the magnetic rotor have plastic surfaces toward the inside of the pump, wherein the pump shaft is torsionally connected to the impeller bush and to the magnetic rotor bush with a form fit.

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2011-11-16

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