Centrifugal pump Yang Cheng and flow relationship

Centrifugal pump Yang Cheng and flow relationship

The flow, head and current of the centrifugal pump have the following relationships:
Current = head * flow
1. First, the height of the lift is determined by the energy loss of the pipes and valves to the water. He said that the energy value that the pump can give to the water, of course, the motor speed decreases and the lift also decreases. When the outlet valve of the centrifugal pump is closed, The head is unchanged, and the flow rate is reduced, so the current of the pump is reduced. If it is fully closed, the current is superior, but slightly higher than idling, because the water has resistance.
2. When the centrifugal pump current is superior, it is when it is idling, that is, there is no water in the pump body, and it is directly connected to the atmosphere, and the pump wheel is idling. [Of course, long-term rotation of the submersible pump can cause overheating damage, and even ordinary Pump, this turn is not good.
3. When the centrifugal pump current is superior, it is when the inlet is connected to the source, such as water, and the outlet is not restricted. For example, it is directly connected to the atmosphere and not connected to the pipeline. At this time, the flow is superior and the pump current will be Superior big.
4. However, the pumps of the general manufacturers are calculated according to the rated flow rate. When there is no restriction like this, the motor may be overloaded and burned, but the big manufacturers are not the same. They are usually based on superiority. Large limit matching motors, even if there are no restrictions on this, the superior efficiency is not high, but the pump will not be damaged.

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