DOUBLE-RING RUBBER WATER-TIGHT SEAL DEVICE AT RING OF CENTRIFUGAL PUMPING HOLE

The utility model provides double-ring rubber water-tight seal device at the ring of a centrifugal pumping hole, which is suitable for a centrifugal pump operating with a closed impeller. The utility model utilizes a double-ring rubber water-tight seal device which is arranged at the ring of a centrifugal pumping hole to preventing water in a high-pressure chamber from flowing to a vacuum chamber. The loss of the volume of the pump is reduced due to the sealing action of the device, and the drop of the vacuum degree of the inlet of the pump is reduced, and the flow rate and the efficiency of the pump are increased. The (NPSH) r value of the pump is decreased, and the suction lift of the pump is raised.