High efficiency low specific speed centrifugal pump

摘要

A centrifugal pump is described, comprising: a casing 3; a rotary shaft 9 arranged for rotation in the casing; a plurality of pump stages 15, 17, each pump stage comprising an impeller 15 secured on said rotary shaft 9 and arranged for rotation in a respective impeller chamber 17 formed in the casing 3. The pump further comprises a plurality of sealing members for reducing leakage between a rotary component and a respective stationary component. At least one of the sealing members 27,29 comprises an arrangement of compliant plate members attached in facing relation at root ends to the respective stationary component and forming a sealing ring between the stationary component and the respective rotary component. Moreover, at least some pump stages have a specific speed of 25 or less.