Influence Of Long-term High-flow Operation Of Centrifugal Pump

The influence of the large flow operation of the centrifugal pump, the influence of the large flow operation of the centrifugal pump

The flow rate of the centrifugal pump can be adjusted steplessly by various methods. Generally speaking, the pump works most reasonably at the rated point, but sometimes due to some reasons, the pump operates at the high flow point, which will cause the following negative effects: influences.

What is the impact of the large flow operation of the centrifugal pump (1) The efficiency is reduced and the power consumption is increased. Centrifugal pumps are generally designed so that the highest efficiency point is near the rated operating point. For example, when a centrifugal pump operates at a large flow rate point, its operating efficiency will drop rapidly. Generally, after the same pump exceeds the rated point, the greater the flow rate, the lower the efficiency. It is very uneconomical to run. Under normal circumstances, it is necessary to re-equip a suitable high-efficiency large-scale pump at this time.

The large flow of the centrifugal pump has a great impact (2) The increase of vibration and noise will cause environmental pollution, damage the pump parts and affect the service life of the pump. At the design point, the shedding loss, impact loss, and vortex loss are relatively small and close to zero because the direction of the liquid flow is consistent with the direction of the blade. However, when the pump works in the large flow area, similar to the small flow condition, due to the deviation from the design point, the shedding loss, impact loss, and vortex loss of the pump flow parts will be further increased. These losses are accompanied by a large amount of hydraulic pressure. noise and mechanical vibration.

What is the impact of the large flow rate of the centrifugal pump (3) - Under normal circumstances, the greater the flow rate of the centrifugal pump, the greater the power of the motor required. When working in a large flow area, it may be overloaded, burn out the motor or cause a circuit protection trip , to stop the pump.

The large flow of the centrifugal pump has a great impact (4) The radial force of the pump increases, which deteriorates the stress on the rotor of the pump. Since the pipeline centrifugal pump deviates from the design point when it works in the large flow area, the flow velocity of the liquid in the vortex increases, but according to the analysis of the velocity triangle, the flow rate of the liquid in the impeller decreases instead, so that the liquid cannot merge, forming an impact and continuously increasing the pressure. produce radial force.

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