Device for axially conveying fluids

A device for axially conveying fluids, comprising:

• a tube-shaped hollow body for conducting fluid in an essentially axial manner, a motor stator located outside of the hollow body, a conveying part responsive to the motor stator and arranged in axial alignment with the hollow body, the conveying part including a central rotor having an outer surface extending between a fluid inlet end and a fluid outlet end and blading fixed to the central rotor outer surface for conveying fluid within the hollow body upon rotation of the conveying part by the motor stator, the hollow body having a constant internal diameter from a point upstream of the fluid inlet end to a point downstream of the fluid outlet end, an actively stabilizing magnetic axial bearing, a passive magnetic radial bearing, and a hydrodynamic radial bearing in the form of a ring coupled to an outer portion of the blading of the conveying part so that at least some of any conveyed fluid passes between the central rotor and the ring, the ring having an internal surface situated everywhere at a position less than the internal diameter of the tube-shaped hollow body, wherein the hydrodynamic bearing ring is joined circumferentially to the blading at a fluid inlet end of the blading and extends only part way toward a fluid outlet end of the blading, the bearings maintaining the conveying part within the tube-shaped hollow body in proximity to the motor stator.