Abstract: A pump having a main shaft which is rotatably supported in a support housing via support bearings. The support bearings are provided with passages which are connected via discharge openings with the space around the pump. As a result, no pressure can build up between the support bearings and a bearing disposed at the lower end of the shaft. Medium which during operation of the pump gets by the seals and the support bearings can flow off out of the pump through these passages and the discharge openings.

Abstract: A pump for fluid media, with an inner pipe or tube arranged in a housing. A drive shaft is journalled in the inner tube, and a rotor is arranged in the housing. The rotor has a main body which is secured to the drive shaft and is provided with conveying blades for the medium. The rotor has a turbine or pump operating counter to the transporting or conveying direction of the conveying blades. At least one passage is arranged in the main body and extends from the pressure side to the suction side of the rotor, with the passage being connected with a suction gap on the inner tube.