MULTI-STAGE CENTRIFUGAL PUMP DISCHARGE DEVICE Russian patent published in 2009 - IPC F04D29/41 

FIELD: engines and pumps.

SUBSTANCE: invention can be used in multi-stage centrifugal pumps. Proposed device comprises hydraulic balancing device 4 with ring, and discharge ring 6 arranged in housing 1. Discharge ring outer part and hydraulic balancing device inner part are build-up elements incorporating inserts made from non-metal material (for example, rubber) representing ring-inserts 10. Ring-inserts 10 are also attached to discharge ring outer part at the point it contacts the ledge of discharge ring 6.

EFFECT: ruling out mechanical contact between discharge device rings to reduce their wear.

1 dwg