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Analysis of the working principle of high-temperature melt metering pump

The melt conveying booster pump is a positive displacement conveying device, and the flow rate is strictly proportional to the pump speed. Mainly composed of pump casing, driving gear, driven gear, sliding bearings, front and rear end plates, packing seals, etc.

The feed area, feed area, and discharge area of the pump are composed of the tooth profile of two gears, the pump body, and the side cover plate. During work, the molten material is transported by the change in working volume caused by the meshing of the main and driven gears.

When the gear rotates in the specified direction, the melt enters the grooves of the two gears in the feeding area. As the gear rotates, the melt is brought into the feeding area from both sides. The re meshing of the gears causes the melt in the grooves to be squeezed out of the discharge area and pressed into the outlet pipeline. As long as the pump shaft rotates, the gear will press the melt towards the outlet side, so the pump outlet can reach a very high pressure, and there are no high requirements for the inlet flow rate and pressure, and even the inlet vacuum suction can be achieved.

melt gear pump

The melt metering pump is mainly driven by an electric motor to drive the transmission shaft to rotate, thereby driving the rotor inside the pump to rotate. During the rotation of the rotor, the molten material is continuously sucked into the pump and transported by pressurizing and discharging the molten material. During this process, the blades and pump casing inside the pump will periodically compress and shear the melt, stabilizing the pressure and flow rate of the melt.

Specifically, when the rotor rotates under the drive of the driving device, it drives the inner blades of the pump and the pump casing to rotate together, thereby forming periodic squeezing and shearing effects on the melt. Due to the design of the pump casing having a tapered channel, 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 pipeline and discharge the melt out of the pump. At the same time, due to the continuous rotational motion of the rotor, the melt is continuously sucked in and discharged in the pump, thus achieving continuous transportation.

extrusion melt pump

In order to achieve precise flow control and stable pressure control, melt metering pumps are usually equipped with control systems. The control system achieves precise control of pump flow and pressure by adjusting the speed of the motor. At the same time, the control system can also monitor and control the operation status of the pump in real time through various sensors and regulators, ensuring the stable operation of the pump under various working conditions.

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