Special pump factory professional sharing: introduction of high viscosity gear pump installation and commissioning

The bearings or flanges of high-viscosity gear pumps and their drive motors should have a common mounting base. The foundation, flange or support must have sufficient rigidity to reduce the vibration and noise generated by the gear pump during operation. The motor and gear pump must be connected by a flexible coupling with a coaxiality of less than 0.1 mm and a tilt angle of no more than 1 degree. Do not hit the hammer with the hammer when installing the coupling, so as not to damage the gears and other parts of the gear pump. If the pulley, sprocket, etc. are used for driving, bracket support should be provided to prevent the drive gear bearing from being subjected to radial force. When tightening the anchor screws of gear pumps and motors, the screws should be evenly stressed and connected reliably. When turning the coupling by hand, you should feel that the gear pump can be easily rotated, and there is no abnormality such as jamming before piping can be used. The inner diameter of the suction pipe of the high-viscosity gear pump should be large enough to avoid narrow passages or sharp turns, reduce elbows, remove unnecessary valves and accessories, reduce the installation height of the pump as much as possible, and shorten the length of the suction pipe to reduce the pressure. loss. The sealing of components such as pipe joints should be good to prevent air intrusion, thereby controlling the occurrence of cavitation and cavitation. Before starting the operation, the housing of the gear pump is filled with the liquid to be transported for safe start-up. If the ambient temperature is lower than the freezing point, the steam should be pre-heated into the pump before the gear pump can be started. The direction of rotation of the gear pump should match the inlet and outlet ports. If the gear pump is running for the first time, or if it is used after long periods of inactivity, it is best to run for an hour or so under no-load or low-load conditions. If abnormal temperature rise, leakage, vibration and noise are detected in advance during the running-in phase, stop the inspection.

The check valve and the safety valve are preferably fitted with a check valve on the output line of the gear pump. In this way, when the pump and the output pipe are inspected, the liquid in the system does not reverse. When the gear pump is parked with load, it can also prevent the pump from reversing and creating a partial vacuum in its output pipe. It should be noted that the outlet check valve cannot be reversed or jammed. Safety devices such as safety valves should also be installed on the outlet line of the high-viscosity gear pump, so that once the outlet passage of the pump is blocked, the safety valve can be opened for pressure relief. The safety valve can be cast in one piece with the pump body or pump cover or it can be assembled separately. For high-viscosity gear pumps that require positive and negative reversal, a safety valve is required on both the inlet and outlet lines.