Pump unit for a centrifugal pump and a centrifugal pump

A pump unit for a centrifugal pump, which includes the pump unit and a stator extending in an axial direction from a first axial end to a second axial end, a cup-shaped recess disposed at the first axial end, into which the pump unit is capable of being inserted, the pump unit comprising:

• a pump housing with an inlet and an outlet for a fluid to be conveyed;
• and
• a rotor arranged in the pump housing, the rotor including a plurality of vanes configured to convey the fluid, each vane of the plurality of vanes extending in the axial direction to an end face of the rotor facing the inlet, the pump housing delimiting a pump chamber, the rotor configured to be rotated about the axial direction, the pump unit configured for a non-contact magnetic levitation of the rotor and for a non-contact magnetic drive of the rotor by the stator, the pump housing having a cover part and a bottom part, the bottom part having a cylindrical cup to receive the rotor, the cup configured to be inserted into the cup-shaped recess of the stator, the inlet having a lip forming an axial end of the inlet, the lip projecting into the pump chamber and, when viewed in a flow direction, ends in front of the end face of the rotor when the rotor is centered with respect to the axial direction in an operating state, and the axial end forming the lip facing the rotor has a maximum depth closer to a central inlet area defined by an inlet diameter, in a radial direction, than to a trailing edge of the plurality of vanes of the rotor.