I have a few questions about gear pumps; thank you!
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May I ask, 1: What is the pressure relationship before and after the gear pump? Boost pressure? 2. Our factory has an extruder gear pump; during operation, the pressure before the pump is set at a constant level, while the pump’s speed can be adjusted automatically. What is the purpose of doing this? 3. If you want to control the pressure after the gear pump, what are the options?
1. A gear pump is a positive-displacement pump, and its outlet pressure depends on the back pressure downstream; therefore, an outlet valve cannot be used to control the flow rate. 2. The speed control of the pump is used to adjust the flow rate. 3. Recirculation is another method for controlling the flow rate and outlet pressure of gear pumps.
The function of adjusting the rotational speed is to regulate the outlet pressure and flow rate. To control the pressure after the pump, the backflow method can also be used.
I agree with what was said above. A gear pump is used to regulate flow rate by adjusting its speed, as flow rate is directly proportional to speed; this can be achieved using an infinitely variable speed motor and an inverter. The outlet pressure of a gear pump can be controlled through the outlet valve, and there is usually an outlet bypass
Are there any other sealing methods for gear pumps besides packing seals? Such as mechanical seal