Pump flow in Asia can be infinitely adjusted by various methods, under normal circumstances, the pump at the rated point conditions work most reasonable, but sometimes for some reason caused the pump to run at a small flow point conditions, Will cause some of the following negative effects. Centrifugal pump long-term low-flow operation What are the disadvantages? (1) reduce efficiency, power consumption increases. Centrifugal pumps are generally designed to make the highest point of efficiency in the vicinity of the rated I condition. If the centrifugal pump is operating at a low flow rate point, its operating efficiency will decrease rapidly. Under normal circumstances, the smaller the same pump flow rate, the lower the efficiency. Therefore, it is uneconomical to operate under low flow rate conditions . Under normal circumstances, then need to re-equipped with a suitable high-efficiency small pump. (2) Vibration and noise increase, causing environmental pollution, damage pump parts, affecting pump life. At the design condition, due to the same direction of the flow and the direction of the blades, loss of flow and loss of impact and loss of vortex are relatively small and close to zero. However, when the pump is working in the low flow area, due to deviation from the design point, the flow loss and loss of the pump overcurrent components are caused, and the vortex loss further increases. These losses are accompanied by a large amount of hydraulic noise and mechanical vibration. (3) a substantial increase in the internal pump backflow, cohesion increased, so that the liquid temperature inside the pump, causing the pump body heat, affecting the mechanical properties of pump parts, but also make the pump cavitation deterioration, further affecting the pump Inhalation conditions. (4) increase the centrifugal force of the centrifugal pump, deterioration of the pump rotor stress situation. As the pump deviates from the design working point when working in the low-flow area, the liquid flow velocity in the vortex chamber decreases. However, according to the analysis of the velocity triangle, the outflow velocity of the liquid in the impeller increases instead so that the liquid can not converge to form an impact and continuously increase the pressure Radial force. (Editor: Huang Nengwen QQ:)
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