What need does the lantern ring serve in a centrifugal pump?

The lantern ring in a centrifugal pump plays a crucial role in providing lubrication and cooling to the packing material and the shaft. Located within the stuffing box, the lantern ring is designed to facilitate the flow of leaked liquid back into the pump, which helps to maintain a steady film of lubricant. This lubrication is essential for reducing friction between the rotating shaft and the packing, ultimately preventing excessive wear and overheating. Additionally, the cooling effect is vital in extending the lifespan of the packing material and ensuring efficient pump operation. By allowing the pump fluid to circulate around the packing, the lantern ring helps dissipate heat and maintain optimal operating conditions.