Screw pump and gear pump slip leakage phenomenon and flow measurement
characteristics
Before describing in detail the operation of each screw pump, let's review the common operation characteristics of some three screw pumps. As mentioned above, the twin-screw pump is capable of discharging the same volume of liquid with each rotation of the shaft. This means that the flow rate of the liquid discharged is proportional to the speed of rotation. In other words, simply change the screw pump speed can control the flow. For the higher viscosity of the liquid, only the shaft revolution can be measured on the pump.
Screw pump structure requires the use of closely with the internal components and a certain operating clearance. As a result of this gap, certain liquids may flow back from the discharge end to the suction end. This phenomenon is known as a "slip". The amount of fluid leakage depends on the viscosity, pressure difference and the internal clearance of the gear pump. The lower viscosity usually results in more slip leakage, while the more viscous liquid results in less slip leakage.
As the gear pump will always try to discharge the same amount of liquid, so it is important to have some necessary overpressure protection devices in the system.
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