What are the ways to adjust the flow of the pump
If the operating point of the centrifugal pump is not in the high-efficiency zone during operation, or the pump's flow rate and head cannot meet the requirements, the method can be changed by changing the pump performance or changing the head curve or both to move it to meet the requirements . This method is called adjusting the operating point of the pump. Commonly used adjustment methods include variable speed adjustment, reducing diameter adjustment, variable angle adjustment, and throttle adjustment.
1. Reduction adjustment
After the impeller is turned, the performance of the pump will change according to a certain law, so that the operating point of the pump will change. We call the method of turning the impeller to change the operating point of the pump, which is called reducing diameter adjustment.
2. Throttling adjustment
For a water pump device with a gate valve installed in the outlet pipe, when the gate valve is closed and local resistance is increased in the pipeline, the characteristic curve of the pipeline becomes steep, and its operating point moves upward along the Q-H curve of the pump. The smaller the gate valve is closed, the greater the increased resistance, and the smaller the flow becomes. This method of changing the operating point of the pump by closing the small gate valve is called throttle adjustment or variable valve adjustment.
When the small gate valve is closed, the local head loss of the pipeline increases, the characteristic curve of the pipeline system moves to the upper left, and the operating point of the pump moves to the upper left. The smaller the gate valve is closed, the greater the local head loss and the smaller the flow rate. It can be seen that the throttling adjustment not only increases the local head loss, but also reduces the water output, which is very uneconomical. However, due to its simplicity, it is widely used in small pump devices and pump performance tests.
3.Variable angle adjustment
Changing the installation angle of the blade can change the performance of the pump, so as to change the operating point of the pump. This way of changing the operating point is called the variable angle adjustment of the pump.
4.Speed adjustment
Changing the speed of the pump can change the performance of the pump, thereby changing the operating point of the pump. This method is called variable speed mediation.
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