Sihi Gmbh & Co Kg

Sterling Fluid Systems Gmbh

Peter Fandrey

Wilfried Lehmann

Hermann Muller

Gudrun Schulz

Regenerative pump

The invention relates to a centrifugal pump having a first centrifugal pump stage (2), which is located on the suction side and is not self-priming, and having a pump inlet nozzle (6), which is located axially at the level of the horizontal shaft (1), and having at least one centrifugal pump stage (3). which is located downstream and which, operating with the aid of auxiliary liquid, is self-priming. According to the invention, the self-priming capability and reliability of the pump, in particular for conveying media in the vicinity of their boiling point, are improved by arranging a liquid reservoir (13), of sufficient size, between two pump stages, the connection from this reservoir to the preceding centrifugal pump stage being located in the geodetically upper portion of the reservoir, and a seal (16) for closing the shaft clearance being located between the liquid reservoir (13) and the preceding centrifugal pump stage.

Self-priming centrifugal pump, in particular for conveying liquids in

The invention relates to a self-priming centrifugal pump that consists of at least one fully-loaded pump or turbine stage with a horizontal shaft and one priming or ventilator stage that is fixed to the same shaft outside the main delivery stream, in the form of a lateral channel or liquid ring pump. In certain specific applications there is no flow through the ventilator stage during normal operation of the pump, and for this reason the ventilator stage is not cooled. The ventilator stage is cooled by virtue of the fact that the suction side of this stage is not only connected to the suction area of the fully loaded turbine stage, in which the gases that are to be removed usually collect, but is also connected to the pressure side of the pump, so that during normal operation a stream of liquid that has a cooling action is formed, and this passes by the suction opening of the ventilator stage.

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Gluckstadt, Germany

Peter Fandrey