Centrifugal pump

Details Centrifugal pump Centrifugal pump

F - Mech Eng,Light,Heat,Weapons

04

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F04D 1/00 (2006.01) F02C 7/236 (2006.01) F04D 29/04 (2006.01) F04D 29/16 (2006.01)

Patent

CA 1233365

CENTRIFUGAL PUMP Abstract A centrifugal pump has a casing with an impeller cavity in which a shrouded impeller is mounted and with front and rear labyrinth seals associated one with each of the front and rear shrouds of the impeller and located near the inner ends of the shrouds. An additional seal is positioned inwardly of the rear labyrinth seal to substantially seal a space behind the innermost part of the rear shroud and a pump structure is mounted on the impeller to the rear of the rear shroud for pumping fluid from the substantially sealed space to the entrance of a volute surrounding the im- peller. The impeller shaft has a front thrust bearing coacting with a bearing surface, with fluid passing therebetween for lubrication and with the flow of the fluid being controlled to a minimal amount by a force imbalance on the impeller shaft created by location of the front and rear labyrinth seals at different distances from the axis of rotation of the impeller whereby pres- sure forces acting at the rear of the impeller urge the impeller shaft in a forward direction.

453477

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