How should the miniature water pump avoid the pump backfilling phenomenon?

Release date:2020-06-03 Author: kf Click:

In fact, the micro water pump thinks that the operation process of the water pump is not very complicated. It just needs to be used correctly. Even with the help of the manual or the micro water pump, there will always be some problems that they cannot help. This requires us to use it. In the process, we can keep learning new content and solving new problems in order to better use the equipment.

The miniature water pump reminds that the pump can only discharge water when the pump is above 30-35Hz, because the higher head of the pump performance curve must be greater than the net head of the pump, or greater than the working head of the pumps running in parallel. This frequency corresponds to the pump's variable frequency operation The lower frequency of the time.

When the frequency is below the very low frequency, the pump does not output water and has no effective power output, and its loss is only the no-load loss of the pump, so the current and power of the motor are very small, and the pump efficiency drops to a lower value at this time.

Once the operating frequency is greater than the lower frequency, the flow of the pump after the water is discharged must overcome the resistance of the pipe network to perform work, on the other hand, it must overcome the net head to perform work. Therefore, the pump power is greatly increased, and the motor current is also greatly increased, and there is a sudden jump. , And then continue to increase as the frequency increases.

Since the water pump always has flow, there is no phenomenon that the power frequency pump flow back to the variable frequency pump. In the actual project, the pipeline is also equipped with a check valve. If the frequency of the frequency converter is lower than a lower frequency, the water pump will not discharge water, the check valve Automatically shuts down to prevent water backflow.

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