How do flow rate and head decrease after a centrifugal pump is frequency-controlled? ? What is the head-flow curve after frequency conversion?

2017-01-10 View Original

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How do flow rate and head decrease after a centrifugal pump is frequency-controlled? ? What is the head-flow curve after frequency conversion?

Reply #2 2017-01-16

Frequency conversion means reducing the speed, but it is not a linear relationship. Then the flow head is given by Q1:Q2 = n1:n2, and H1:H2 = (N1:N2)²

Reply #3 2017-01-16

What was said upstairs is correct; the function of variable frequency is to adjust the speed of the pump shaft. When the speed decreases, both the flow rate and the head will change. Therefore, there needs to be a selection process, with the ultimate goal being to meet the requirements for flow regulation. In fact, there are various ways to regulate flow; using variable frequency control of pumps is not common, and it is not necessarily the ideal solution. Think carefully!

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