What are the mechanical losses of centrifugal pumps?

What are the mechanical losses of centrifugal pumps from pump manufacturers? The mechanical losses of centrifugal pumps include bearing, shaft seal digging loss and impeller disc friction loss. 1. Friction loss of bearing and shaft seal The pump shaft is supported on the bearing. In order to prevent the liquid in the pump from leaking out, a shaft seal is installed. When the pump shaft rotates at high speed, friction occurs with the bearing and shaft seal. In general, the friction loss is relatively small, as: △Nu003d(0.01~0.03)N where △N——friction loss; N——the shaft power of the prime mover to the water pump. 2. Impeller disc friction loss. The centrifugal water pump impeller rotates in the pump casing filled with liquid. At this time, the outer surface of the impeller cover and the liquid rub against each other to cause friction loss. Disc friction loss accounts for a large proportion of the overall mechanical loss, especially for some pumps with medium and low revolutions. The relationship between disc friction loss and specific speed. For pumps with a low specific speed, the friction loss of the disc is faster. For example, when the specific speed nsu003d30, the friction loss of the disc increases to 30% of the effective power; while for a pump with a high specific speed, the specific gravity of the disc friction loss is Smaller. The percentage of various energy losses in multi-stage water pumps, in typical cases: impact and vortex loss 7% impeller and balance disc friction loss 5% gap leakage loss 2% balance mechanism leakage 2% hydraulic surface friction loss 4%. u003c/pu003e
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