Extending the Service Life of Polyester Melt Gear Pump

　　Melt gear pump is an indispensable equipment for transporting and measuring polyester melt. Compared with other types of melt pump, gear pump has compact structure, reliable operation, low energy consumption, high volume efficiency, small shearing effect on melt, stable flow at high viscous and high pressure, and no fluctuation of outlet pressure. The unique advantages of the pump and its key role in the process make it play an irreplaceable role in the production of polyvinegar. In this paper, how to effectively prolong the service life of polyester melt gear pump is introduced, and several methods are adopted.

　　1. Because the pump body of polyester melt gear pump runs at high temperature, hinged support should be installed on piping during cold installation to prevent piping displacement after heating up.

　　2. U-coupling must be heat-aligned after the pump body is heated to avoid additional torque caused by thermal deformation during operation.

　　3. The outlet pressure measuring point of the melt gear pump should be interlocked to stop substituting, otherwise, once the discharge pipe is blocked, the pump body will be easily damaged.

　　4. When starting the pump of the melt pump, when no pressure is formed at the exit, the speed should not be increased blindly to prevent premature damage of the shaft or bearing.