Centrifugal pump mechanical loss

Centrifugal pump mechanical loss of bearings, shaft seal friction loss and impeller disc friction loss. First, the bearing, shaft seal friction loss pump shaft bearing on the bearings, in order to prevent leakage of liquid to the pump, set the shaft seal. When the pump shaft rotates at a high speed, friction occurs between the bearing and the shaft seal. Under normal circumstances, the friction loss supervisor is smaller: ΔN = (0.01 ~ 0.03) N where ΔN - friction loss; N - the prime mover shaft power delivered to the pump. Second, the impeller disc friction loss Centrifugal pump impeller in the liquid-filled pump shell rotation, then the outer surface of the impeller cover and the liquid friction occurs, causing friction loss. Disc friction loss in the entire machinery loss accounted for a larger proportion, especially in some, low specific rotation pump more so. As we know, the friction loss of the disc with low specific speed increases rapidly, for example, the disc friction loss increases to 30% of the effective power at the specific rotation number of ns = 30; while the disc friction The proportion of losses is small. The percentage of various energy losses in a multistage pump is typically as follows: Shock and vortex loss 7% Disc friction loss of impeller and balance disc 5% Clearance leakage loss 2% Leakage loss of balance mechanism 2% Hydraulic surface friction Loss of 4%

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