Misuse of gear pumps

The inlet of the gear pump inlet is not in the right direction.

Many pilots think that this can improve the practice of lift, the original gear pump practice head = total head to lose head. When the type of gear pump is determined, the total head is certain; the loss of head mainly comes from pipeline resistance, the smaller the diameter of the pipe, the greater the obvious resistance, so the loss of head, the greater the cause of stainless steel corrosion analysis, so reducing the diameter of the pipe, the gear pump practical head not only can not be added, but will reduce, resulting in a reduction in pump power.

Similarly, when the small diameter gear pump is pumped with large water pipe, the practical lift of the pump will not be reduced, but the lost head will be reduced because of the reduction of the resistance of the pipeline, and the practical lift will be improved. Others think that the small diameter gear pump with large water pipe pumping, it is bound to greatly increase the motor load, they think that the diameter of the pipe increases, the water in the outlet pipe on the pressure of the impeller of the gear pump, so it will greatly increase the motor load. However, the magnitude of the liquid pressure is only related to the concave and convex of the head, but has nothing to do with the size of the water pipe area.

As long as the head is certain, the impeller size of the gear pump remains unchanged, no matter how large the diameter of the pipe, the pressure acting on the impeller is certain. Only when the pipe diameter increases, the flow resistance decreases and the flow rate increases, and the power consumption also increases appropriately. But as long as in the rated head range, regardless of how to add pipe diameter, gear pump is able to work normally, but also to reduce pipeline loss, improve the power of gear pump.