Design principle of high temperature melt metering pump

High-temperature melt pumps are mainly used for transporting, pressurizing, and metering high-temperature and high-viscosity polymer melts. It has the characteristics of compact structure, reliable operation, low energy consumption, high volumetric efficiency, and small shearing effect on the melt. High-temperature melt pumps are usually used together with extruders in plastic processing. They can further homogenize the melt, provide stable flow at high temperatures and high pressures, no pulsation in material output, high volumetric efficiency, and small shearing effect on the melt. Thereby improving product quality and product accuracy and reducing costs. It can be used for plastic melt granulation and mixing, and can also be used for extruding sheets, pipes, films and profiles, etc.

The working principle of the melt metering pump is mainly driven by a motor to drive the transmission shaft to rotate, thereby driving the rotor in the pump to rotate. During the rotation of the rotor, the melt will be continuously sucked into the pump, and the melt will be transported by pressurizing and discharging the melt. During this process, the blades and pump casing in the pump will cause periodic squeezing and shearing effects on the melt to stabilize the pressure and flow rate of the melt.

Specifically, when the rotor rotates driven by the driving device, it will drive the blades in the pump and the pump casing to rotate together, thereby forming periodic squeezing and shearing effects on the melt. Since the design of the pump casing features tapered channels, the pressure of the melt will gradually increase during the rotation of the rotor. When the pressure reaches a certain value, it will overcome the resistance of the outlet pipe and discharge the melt out of the pump. At the same time, due to the continuous rotation of the rotor, the melt is continuously sucked in and discharged in the pump, thereby achieving continuous transportation.

In order to achieve precise control of flow rate and stable control of pressure, melt gear pumps are usually equipped with a control system. The control system adjusts the speed of the motor to achieve precise control of the flow and pressure of the pump. At the same time, the control system can also monitor and control the operating status of the pump in real time through various sensors, regulators and other components to ensure the stable operation of the pump under various working conditions.

In short, the design points and principles of the melt pump for extusion are the key to achieving efficient, stable and long-life transportation. Through in-depth analysis of the key points of its structural design, material selection and control system, its working principle and application can be better understood. As technology continues to advance and application requirements continue to increase, the design and principles of melt metering pumps will continue to be improved and developed.

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