A MULTI-STAGE CENTRIFUGAL PUMP COMPRISING AN ASSEMBLY FOR COMPENSATING AXIAL FORCES

Invention relates to a multi-stage centrifugal pump comprising an assembly (10) for compensating axial forces in a multi-stage centrifugal liquid pump (100) having an inlet (102) and an outlet (104), comprising a balancing drum (16) arranged to the shaft (14) inside the housing (12), which the balancing drum (16) is a multistage balancing drum, which comprises at least two drum sections (16', 16''), a first pressure chamber (22) between a first side wall of the circumferential axial space (16.3) and a first side wall of the ring element, a second pressure chamber (24) between a second side wall of the circumferential axial space (16.3) and a second side wall of the ring element, a first flow communication path extending from outlet (104) of the pump (100) to the second pressure chamber (24), a second liquid communication path extending from inlet (102) of the pump (100) to the first pressure chamber (22), first annular flow path between the first pressure chamber (22) and the second pressure chamber (24) via the bottom of the circumferential axial space (16.3) and inner surface of the ring element (20), and second annular flow path between the first pressure chamber (22) and the second pressure chamber (24) via the outer surface of the drum section (16',16'',16''') and the inner surface of the housing (12).