Centrifugal pump to circulate hot, gently gassing and/or gas-charged media with impeller producing pre-pressure before first side channel pump stage and intermediate stage embodied as peeler forming spiral emptying directly into this stage

摘要

Pump (1) has first pump normal suction pump stage (25) acting as preliminary "NPSH" stage on suction side and at least one connected side self-suctioning channel pump stage (26), working with additional fluid. A peeler (6) embodied as axial spiral is located between both stages. The axially emptying impeller produces maximum pre-pressure before the first side channel pump stage and the intermediate stage is embodied as a peeler forming a spiral. The end of the spiral empties directly into the first stage of the side channel pump. The gyrowheel (3) of the pump stage and impeller (4) of the side channel pump stage are containing within housing (5). The diameter of the peeler from the start of direction of medium flow to the end steadily and evenly increases. The outlet of the peeler ends in the inlet of the side channel stage without projecting. The medium flows out of peeler into impeller with minimal, defined deviation having low leakage.