High fluctuation of melt pump outlet pressure
The main reasons for large fluctuations in melt pump outlet pressure include wear and tear of equipment, improper operation, material problems and abnormal system control. Specifically can be summarized as the following key factors:
First, equipment aging and component wear
Gear wear: gear or shaft sleeve clearance increases after long-term use, resulting in increased melt reflux and unstable outlet pressure.
Bearing and seal aging: sliding bearing or seal wear will reduce the lubrication effect, resulting in increased resistance to rotation or melt leakage, further affecting the pressure stability.
Second, the operation and material problems
Insufficient inlet material or impurities Insufficient supply of melt at the pump head inlet will cause the gear to be incompletely filled, triggering sudden pressure changes and vibration.
Materials containing air bubbles, metal foreign objects or carbonized coking material, may clog the pump body or aggravate gear wear.
Improper temperature control: Melt viscosity varies significantly with temperature, and if the heating system is unstable, flow fluctuations will be directly reflected in the outlet pressure.
Third, the pipeline and system control defects
Irrational piping design: flow resistance, dead space or too small a bending radius will increase fluid resistance, resulting in pressure fluctuations.
Control system failure: insufficient accuracy of the pressure sensor or abnormal control algorithms, unable to stabilize the regulation of output pressure.
Fourth, other factors
Foreign matter stuck: metal parts or coking matter stuck between gears may instantly block or even damage the pump body, triggering violent pressure fluctuations.
Suggested troubleshooting directions Prioritize checking the wear and bearing sealing status of the gear pump. Confirm the stability of the melt transfer piping layout and temperature control. Check whether there are foreign materials or air bubbles in the material, and optimize the filtration system if necessary.
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