High-temperature melt pump is an indispensable equipment for high-temperature and high-viscosity polymer melt transportation, pressurization and melt metering. High temperature melt pump is more compact than other types of pumps, reliable operation, low energy consumption, high volumetric efficiency, small shear effect on the melt, high viscosity and high pressure when the flow rate is stable, no fluctuations in outlet pressure. The unique advantages of the pump and its key role in the process make it play an irreplaceable role in polyester production.

Structure and working principle of high temperature melt pump

Melt gear pump consists of pump casing, front and rear side cover, gear shaft, sliding bearing and shaft seal. Melt gear pump belongs to the positive displacement pump, work on the master and slave gear meshing caused by the working volume changes to transport the melt. The working volume consists of the pump body, the gear's tooth groove and the bearing with side plate function. When the gear rotates, the melt enters into the tooth grooves of the two gears in the suction chamber, and as the gears rotate, the melt is brought into the discharge chamber from both sides, and the gears mesh again, so that the melt in the tooth grooves is extruded into the discharge chamber, and pressurized to the outlet pipe. As long as the pump shaft rotates, the gears will press and send the melt to the outlet side, so the pump outlet can reach a very high pressure, and the flow rate is basically irrelevant to the discharge pressure. 

The gears of high viscosity gear pumps commonly have straight teeth, helical teeth, herringbone teeth, helical teeth, and the tooth profile mainly has involute and circular arc type. Usually small gear pumps use involute straight gears, high temperature gear pumps often use gears, transport high viscosity, high pressure polymer melt melt pumps use involute helical gears. Gears and shafts made of one, its rigidity and reliability than gears and shafts manufactured separately gear pumps. Foreign low-pressure gear pumps often use a square structure of the gear, that is, the gear tooth width is equal to the diameter of the top of the circle. The high-pressure occasions used in high-viscosity gear pumps, the width of the gear teeth is less than the diameter of the top of the circle, which is to reduce the radial pressure area of the gear, reduce the load on the gears, bearings.

Heiko specializes in the manufacture of all types of melt pumps and screen changers.