High-pressure gear pumps are essential for polyester melt delivery, pressurization and melt metering. High-pressure gear pumps are compact, reliable, low-energy, high-volume, and melt-to-melt compared to other types of melt pumps. The shearing effect is small, the flow is stable at high viscosity and high pressure, and there is no outlet pressure fluctuation. The unique advantages of the pump and its key role in the process make it play an irreplaceable role in polyester production.
Measures to improve the operating life of high-pressure gear pumps
1. Since the pump body of the high-pressure gear pump is operated under high pressure, the hinged support should be provided on the piping when the cold state is installed to prevent the displacement of the piping after heating;
2. The coupling must be hot after the pump body is warmed up to avoid additional torque during operation;
3. The pressure measuring point of the high-pressure gear pump outlet should be set to stop the alarm, otherwise the pump body will be damaged if the discharge pipe is blocked;
4. When the high-pressure gear pump starts, do not blindly increase the speed when the outlet is not formed to prevent premature damage of the shaft or bearing;
5. Do not use the pump to transport the cleaning solution when cleaning the pipetting. The internal parts should be removed after the pipetting is completed to prevent the foreign matter from being mixed into the pump;
6. The temperature of the heat medium jacket of the pump of the high-pressure gear pump can be slightly lower than the temperature of the heat medium of the front and rear casings. Because the melt viscosity and the shear rate are in a decreasing function, the extrusion of the gear and the shearing of the bearing will make The melt temperature rises by 3~5 °C after pumping. The temperature of the heat medium can be reduced to prevent melt degradation. The data shows that the bearing capacity can be greatly increased by reducing the temperature of the bearing zone. It is not necessary to replace the large-capacity pump only by increasing the speed. The output capacity of the gear pump can be increased by 50%.
7. Speed ​​up slowly. Do not let the front and rear pressure rise sharply to avoid damaging the bearing or blocking the lubrication passage.
8. The melt filter behind the high-pressure gear pump outlet should be replaced periodically. Do not operate at high pressure or even pressure upper limit for a long time;
Article from: http://NewsDetail253T2.html China Hardware Business Network http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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