Patent ID: 11933321
Assignee: SULZER MANAGEMENT AG
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A rotary pump for conveying a fluid, comprising:
a pump housing with an inlet to receive the fluid having a suction pressure, an outlet to discharge the fluid having a discharge pressure;
a pump shaft configured to rotate about an axial direction;
a hydraulic unit configured to convey and pressurize the fluid, the hydraulic unit comprising at least one impeller fixedly mounted on the pump shaft;
a balance drum fixedly connected to the pump shaft and arranged between the hydraulic unit and an end of the pump shaft, the balance drum defining a high pressure, front side facing the hydraulic unit and a low pressure back side facing away from the hydraulic unit,, an axial relief passage disposed between the balance drum and a stationary part configured to be stationary with respect to the pump housing and connecting the high pressure front side with the low pressure back side;
a balance line connecting the low pressure back side with a low pressure location; and
a balancing device arranged between the balance drum and the hydraulic unit, the balancing device comprising a ring-shaped rotary part fixedly connected to the pump shaft, and a ring-shaped non-rotary part, which is movable only in the axial direction, the rotary part having an axial face facing the hydraulic unit, the rotary part and the non-rotary part configured to overlap with respect to a radial direction, which is perpendicular to the axial direction, and the non-rotary part configured to be movable in the axial direction such that a radial relief passage is open during operation of the pump, with the radial relief passage extending in the radial direction between the rotary part and the non-rotary part.