High temperature pump maintenance and management

High-temperature pump polyester melt delivery, pressurization and melt measurement is essential equipment. Compared with other types of melt pumps, the high temperature pump has the advantages of compact structure, reliable operation, low energy consumption, high volumetric efficiency, small shear effect on the melt, stable flow at high viscosity and high pressure, and no outlet pressure fluctuation. The pump has its unique advantages and the key role in the process, making it play an irreplaceable role in polyester production. However, improper use of the pump, poor management, not only failed to demonstrate its effectiveness, or even cause sudden damage to the pump. First, the structure and working principle A complete gear pump including motor, reducer, coupling and pump head several parts, the pump head part of the pump housing, front and rear side cover, gear shaft, sliding bearings and shaft seal form. High-temperature pump is a positive displacement pump, work rely on the main and driven gears caused by the intermeshing changes in the volume of work to transport the melt. Working volume by the pump body, gear tooth groove and the function of the side plate with the composition. When the gear rotates in the direction as shown in FIG. 1, the melt enters the tooth grooves 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 mesh again to make the The melt is forced out of the discharge chamber and pressure fed to the outlet pipe. As soon as the pump shaft is turned, the gear presses the melt down to the outlet side so that the pump outlet can reach very high pressure with little or no effect on flow and discharge pressure. Second, the operation and management 1, routine maintenance (l) high temperature pump disintegration and cleaning, heating, cooling, starting and stopping should be strictly in accordance with the provisions of the operation to avoid unnecessary losses. (2) Care should be taken to maintain the stability of the population pressure of the booster pump so that it has a stable volumetric efficiency in favor of the pump itself and the stability of the downstream spinning quality. (3) The population is negative pressure of the packing shaft seal pump, packing should be kept at a pressure higher than the atmospheric pressure. When the back pressure is reduced, the pressure of the stuffing box should be adjusted in time, otherwise the pump will be sucked into the air and the belt will be broken. This will affect the pelletizing and cause the discharge of the pelletizer. (4) to check the temperature of the heat medium jacket, the main body and the front and back cover of the heat medium temperature to be consistent. (5) Every time the output increases, it is necessary to record the output, speed, output, inlet pressure and current value at the time, and compare the data before and after, and carefully analyze them so as to find the abnormalities as soon as possible and deal with them in time. 2, common faults and countermeasures are as follows: (1) Symptom: Pump can not discharge Fault causes: a, the opposite direction of rotation; b, suction or discharge valve is closed; c, the inlet without material or pressure is too low;