Centrifugal Pump Pump Energy Loss Centrifugal pump mechanical energy obtained from the prime mover, only part of the energy converted to liquid, while the other part of the loss due to pump consumption. The degree to which the centrifugal pump applies prime mover energy is expressed by the efficiency h of the centrifugal pump. It is one of the main pump performance indicators. Analysis of the causes of pump losses, for improving the structure of the pump to identify ways to improve the centrifugal pump efficiency is of great significance. All losses in a centrifugal pump can be divided into the following items: 1. Hydraulic losses are caused by the liquid's impact inside the pump, vortex and surface friction. Impact and eddy current losses are due to the direction of fluid flow changes. Liquid flows through the contacted flow path for a total amount of surface friction. The resulting energy loss depends mainly on the length, size, shape, surface roughness of the flow path, and on the flow rate and characteristics of the liquid. Volume Loss Volume loss is the result of a portion of the liquid that has been energized, which is bypassed and leaked out of the pump. The volumetric efficiency of the pump h capacity is generally 0.93 to 0.98, with the centrifugal pump size increases, this efficiency will be increased. Improve the seal ring and seal structure, can reduce leakage loss, improve volumetric efficiency. 3. Mechanical loss Mechanical loss refers to the frictional loss between the side of the impeller cover and the liquid in the pump casing, ie the disc loss and the friction loss of the centrifugal pump shaft during the movement of mechanical parts such as packing, bearing and balancing device. Generally, Mainly. The total efficiency of the centrifugal pump h pump = h machine × h water × h capacity of the centrifugal pump capacity of up to 0.85 ~ 0.90.
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