Centrifugal pump efficiency is the mechanical, volume and hydraulic three products. Pump efficiency is the product of pump efficiency and motor efficiency. Centrifugal pump group caused by the low efficiency of the following factors.
1. Pump efficiency itself is the most fundamental effect. The same working conditions of the pump, the efficiency may differ by more than 15%.
2. Centrifugal pump operating conditions lower than the rated pump conditions, low pump efficiency, high energy consumption.
3. Motor efficiency in the use of the basic unchanged. So it is important to choose a high efficiency motor.
4. The main impact of mechanical efficiency and design and manufacturing quality. After the pump is selected, the latter part of the management has little effect.
5. Hydraulic losses include hydraulic friction and local resistance loss. Centrifugal pump operation for a certain period of time, inevitably cause impeller and guide vane and other parts of the surface wear, hydraulic loss increases, reducing hydraulic efficiency.
6. Centrifugal pump volume loss, also known as leakage losses, including the impeller seal ring, interstage, axial force balance of three types of leakage losses. The level of volumetric efficiency is not only related to the design and manufacture, but also related to the latter part of management. Pump continuous operation for a certain period of time, due to the friction between the various components, the gap increases, reducing the volumetric efficiency.
7. As the filter cylinder is clogged, pipeline intake and other causes of centrifugal pump exhaust and idling.
8. Before starting the pump, the staff did not pay attention to the preparatory work before the start of the centrifugal pump. The implementation of basic operating procedures such as warm pump, disk pump and perfusion pump was not implemented thoroughly, often resulting in the cavitation of the pump, causing large pump noise, large vibration and low pump efficiency.
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