PUMP WITH DOUBLE- SUCTION IMPELLER GENERATING AXIAL THRUST.

摘要

Apparatus, including a vertical double-suction pump, is provided featuring a pump casing and a double suction impeller arranged therein on a shaft. The pump casing has a pump casing wall. The double suction impeller has upper and lower shrouds with metal rims configured to form upper and lower isolating annuli between the double suction impeller and the wall of the pump casing in order to impede a recirculation flow from the impeller discharge to the impeller inlet. The isolating annuli are configured to create different pressure distributions on the two shrouds, thereby generating a controlled and purposive axial thrust load. The isolating annuli may be geometrically different.