CONTROLLED LEAKAGE CENTRIFUGAL PUMP

摘要

The cost of a centrifugal pump is reduced by providing it with a generally cylindrical casing having a radial discharge nozzle near the upper end of the casing and a suction nozzle at the lower end. The casing is bolted to a main flange having a cylindrical neck extending downwardly inside the casing. The pump shaft extends through the neck and the main flange. A radial bearing assembly is bolted to the lower end of the neck. In certain applications, breakdown bushings surround the shaft within the neck and controlled leakage shaft seals are disposed in the main flange, thereby confining the high pressure liquid within the casing and the main flange. A cooler surrounds the shaft between the pump impeller and the radial bearing assembly. A thermal barrier surrounds the bearing assembly.