SEALING DEVICE FOR COMPENSATING FOR RADIAL FORCES EXERTED BY IMPELLER AND SHAFT OF A CENTRIFUGAL PUMP

摘要

This invention relates to a device for balancing radial forces in rotor dynamic machines, especially centrifugal pumps which are provided with a seal between the pump impeller and the surrounding pump housing. A stationary seal ring is provided with two or two groups of notches. These are arranged peripherally and one of the groups of notches is exposed to the interior of the pump housing and the second group of notches is exposed to the surroundings, generally atmospheric. A pressure differential then exists which brings about a radial force on the impeller in a direction opposite that caused by radial reaction forces from the surrounding pump housing.