Use variable frequency to adjust the flow and head of a centrifugal pump – what is the difference between the following two methods? ?
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Use variable frequency to adjust the flow and head of a centrifugal pump – what is the difference between the following two methods? ? 1. Frequency conversion under conditions of high flow rate and low head ； 2. Downconversion at low flow rate and high head? ? ?
The ultimate goal achieved in this way is the same; it’s simply to adjust the opening degree of the valve
When conventional throttling control results in a large pressure drop and significant energy waste, variable frequency control can be used
Variable frequency + valve. I can’t think of any good solutions. Have you considered switching to a positive displacement pump? Motor cooling is a problem after frequency conversion of impeller pumps
There is a problem with the question itself; frequency conversion control essentially involves adjusting the speed of the pump shaft through frequency changes, thereby changing the pump’s flow rate and head. Pumps with high flow rates and low head, as well as those with low flow rates and high head, can both be adjusted. But only one parameter can be adjusted: either the flow rate or the head (the outlet pressure of the pump).
Frequency conversion control has already been used; next, we can address the energy consumption issue based on the actual situation, and that will be sufficient
Since the speed of the pump shaft changes, don’t both the flow rate and head change as well? Why can only one be adjusted?
Since the speed of the pump shaft changes, don’t both the flow rate and head change as well? Why can only one be adjusted?