Centrifugal pump impeller with replaceable wear ring

摘要

A centrifugal pump impeller, particularly for use in pumps for effecting forced circulation of contaminated fluids in the primary circuits of nuclear reactor plants, has an impeller body which is surrounded by a cylindrical wear ring. The wear ring has an exposed end face and a second end face which is adjacent to a circumferential shoulder of the impeller body. The second end face of the ring is formed with axially parallel bores or slots which extend toward but short of the first end face, and the shoulder has recesses which are aligned with the open ends of the adjacent bores or slots. The first end face of the ring is formed with markers in the form of notches which register with the corresponding bores or slots and allow for accurate positioning of a boring tool which is used to bore out the ring after a certain period of wear to facilitate its separation from the impeller body and replacement with a fresh wear ring. The ring can be secured to the impeller body by screws and/or by being shrunk onto the peripheral surface of the impeller body.