What determines the rotational speed of a melt gear pump?

Polymer melt gear pumps belong to the positive displacement pump, the flow rate and rotational speed is nearly linear proportional relationship, the choice of pump speed determines the melt gear pump specifications, is an important selection parameters.

The main factors that determine the rotational speed of the melt gear pump are:

1, the viscosity of the material, the higher the viscosity of the material, the lower the speed. High viscosity melt needs more driving force to push, if the speed is too high, the motor may be overloaded, and will increase the wear and tear of gears and pump body. Therefore, when conveying high viscosity melt, usually choose a lower speed to ensure the normal operation and service life of the pump;

2, the material contains impurities or abrasive particles, the speed is reduced. The material, if not clean, will have a certain degree of wear and tear on the pump's gear shaft tile, and at this time the rotational speed needs to be lowered to minimize the damage to the pump;

3, the higher the differential pressure, the lower the rotational speed; the efficiency of the melt gear pump is lower when the differential pressure is high, and the required flow rate should be matched with a lower rotational speed to calculate the required rotational displacement;

4, the pump inlet vacuum, or the pump inlet pipe diameter is relatively small, the rotational speed needs to be reduced. Inlet vacuum or inlet pipe diameter is small, the material is more difficult to inhale, this time should reduce the pump speed to avoid suction air.

In summary, there are many factors affecting the selection of melt gear pumps, suppliers need to be based on material parameters and engineering application experience, after comprehensive consideration to give the appropriate selection program to ensure that the equipment can be long-term, efficient and safe use.

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