High temperature gear pumps are essential for polyester melt delivery, pressurization and melt metering.
High temperature gear pumps are essential for polyester melt delivery, pressurization and melt metering.
Compared with other types of melt pumps, the high-temperature gear pump has compact structure, reliable operation, low energy consumption, high volumetric efficiency, small shearing effect on the melt, stable flow at high viscosity and high pressure, and no outlet pressure fluctuation.
The pump's unique advantages and key role in the process make it an irreplaceable role in polyester production.
Da Lan Electric tells you that a complete gear pump includes the motor, reducer, coupling and pump head.
The pump head portion is composed of a pump casing, front and rear side covers, a gear shaft, a sliding bearing and a shaft seal.
The high-temperature gear pump is a positive-displacement pump, which relies on the change of working volume caused by the mutual meshing of the main and driven gears to transport the melt. The working volume is composed of a pump body, a tooth groove of the gear, and a bearing having a side plate function.
When the gear rotates, the melt enters the tooth groove of the two gears of the suction chamber. As the gear rotates, the melt is brought into the discharge chamber from both sides, and the gears are again meshed, so that the melt in the tooth groove is squeezed out. The chamber is pumped to the outlet pipe.
As long as the pump shaft rotates, the gear presses the melt to the outlet side, so that the pump outlet can reach a very high pressure, and the flow rate is substantially independent of the discharge pressure.
Maintenance in daily operation:
1. Disintegration and cleaning of the pump, rise and fall, start and stop should be strictly in accordance with the regulations to avoid undue losses.
2, should pay attention to keep the pressure of the booster pump population stable, so that it has a stable volumetric efficiency, in order to facilitate the operation of the pump itself and the stability of the downstream spinning quality.
3. The packing shaft seal pump with negative population pressure should keep the pressure at the stuffing box higher than the external atmospheric pressure. When the back pressure is reduced, the pressure of the stuffing box should be adjusted in time. Otherwise, the pump will take in air, causing the strip to be broken, which will affect the pelletizing and cause the pelletizer to discharge.
4. Always check the temperature of the heat medium jacket, and keep the temperature of the main body and the heat medium of the front and back covers consistent.
Every time the output is increased, the output, rotation speed, outlet pressure, and current value at that time should be recorded, and the data before and after should be compared and carefully analyzed, so as to find the abnormality as soon as possible and deal with it in time.
Measures to improve operating life:
1. Since the pump body is running at high temperature, the hinged support should be provided on the piping during cold installation to prevent the displacement of the piping after heating.
2. The coupling must be hot after the pump is warmed up to avoid additional torque during operation.
3. The pump outlet pressure measuring point should be set to stop the alarm. Otherwise, once the discharge pipe is blocked, the pump body is easily damaged.
4. When the pump starts, when there is no pressure at the outlet, do not speed up blindly to prevent premature damage of the shaft or bearing.
5. When cleaning the pipetting, do not use the pump to transport the cleaning solution. The internal parts should be removed and installed after the pipetting is finished, so as to avoid foreign matter in the pump.
6. The temperature of the heat medium jacket of the pump body can be slightly lower than the temperature of the heat medium of the front and rear casings.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
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