On the relationship between power and speed of twin-screw oil pumps
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I have a **question** for everyone. Theoretically, pump power = pressure difference * flow rate / efficiency. Assuming the efficiency remains constant, if the rotation speed doubles, the power should also double. However, by reviewing various documents and specifications provided by manufacturers, I found that when the rotation speed of a twin-screw oil pump doubles, its power increases by more than twice. Could someone please explain where the mistake lies in this calculation?
If the rotational speed doubles, the flow rate also doubles – what about the pressure difference?
Mine has 2950 rpm and a power output of 4 KW. Compare it by yourself
The rotational speed doubles, the flow rate doubles, the pressure difference remains unchanged; as a result, the motor’s input power increases by nearly 3 times. Will the pump’s efficiency change that much?
I was wondering, does your pump come with a performance curve? If, under the same operating conditions, the rotational speed becomes 1450, what will be the power? What type of pump do you use?