The main factors that cause the low efficiency of the multi-stage centrifugal pump group are the following:
1.Multi-stage centrifugal pump itself is the most fundamental efficiency of the impact. Under the same working conditions of the pump, the efficiency may be a difference of more than 15%.
2.The operating condition of the centrifugal pump is lower than the rated condition of the pump, the pump efficiency is low and the energy consumption is high.
3.Motor efficiency in the use of basic remain unchanged. Therefore, it is important to choose a high efficiency motor.
4.The influence of mechanical efficiency is mainly related to the design and manufacture quality. Pump selected, the late management of small.
5.Hydraulic loss, including hydraulic friction and local resistance loss. After running a certain time, it will inevitably lead to the surface of the impeller and guide vane surface wear, water loss increases, the hydraulic efficiency decreases.
6.The volume loss of the multi-stage centrifugal pump is also known as the leakage loss, including the impeller seal ring, the stage, the axial force balance mechanism of three kinds of leakage loss. Volume efficiency is not only related to the design and manufacture, but also with the management of the late. After running for a certain period of time, due to the friction between the components, the gap increases, the volume efficiency decreases.
7.As the filter cylinder block, intake and other causes of pipeline centrifugal pump and idling.
8.Multistage centrifugal pump before the start, the staff do not pay attention to the centrifugal pump before the start of the preparatory work, heating pump, plate pump, infusion pumps and other basic operating procedures are not complete, often caused by pump cavitation, causing the pump noise, vibration, low pump efficiency.
