CENTRIFUGAL PUMP WITH BUILT-IN REAR BEARING Russian patent published in 2011 - IPC F04D29/41 

FIELD: engines and pumps.

SUBSTANCE: invention refers to hydraulic power engineering and namely to multi-stage centrifugal pumps with built-in rear bearing and is equipped with hydraulic unloading assembly of axial force balancing. Pump is equipped with hydraulic unloading assembly of axial force balancing, which consists of hydraulic balancing device 2 and pedestal socket 3. To the assembly there supplied is pumped liquid from rear cavity 9 of the last impeller 6 and removed from it to the pump inlet or to be drained. For the purpose of restricting the liquid flow through discharge assembly, throttling device 12 is arranged in main outlet line 11. Device 12 is formed beyond shaft 2 of the pump, for example owing to the appropriate selection of cross section in separate section of main outlet line 11.

EFFECT: invention will allow simplifying the pump design, improving its service life and efficiency.

4 cl, 2 dwg