Pressure and flow rate of screw pump
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If the motor power of a screw pump is not taken into account, can the pressure keep increasing? Is the export flow stable and non-adjustable?
This post was last edited by 3983596_FPPZ on 2019-2-18 at 15:00. Yes, the flow rate of a screw pump is almost constant, independent of the outlet pressure
There is still a relationship between flow rate and rotational speed; generally, screw pumps have specified values for both rotational speed and flow rate
A screw pump is a positive-displacement pump; its outlet pressure is determined by the back pressure, and it can continue to increase as long as the power supply and the pressures in the pipelines and equipment allow it. Until the safety valve activates
“If the motor power of a screw pump is not taken into account, can the pressure keep increasing? Is the export flow stable and non-adjustable? ” First of all, the power of a motor and its speed are two different things. High power does not equal high speed. Therefore, if the outlet pressure reaches a certain level, the motor will trip due to overcurrent and lose power, or it may get burned out. The outlet flow can be adjusted through partial backflow. Since these pumps are of the positive-displacement type, their liquid compression coefficient is very low; once the flow rate is affected, the pressure rises and excess pressure is generated.