DEVICE FOR PUMP IMPELLER FAIRING FASTENING Russian patent published in 2018 - IPC F04D29/20 

FIELD: engine devices and pumps.

SUBSTANCE: device for fastening pump impeller comprises a fairing provided with a locking ring projection for mating with mating surface of the impeller, a fastening bolt with a thread for fastening of the fairing coaxially on a working wheel. In the inner central cavity of the fairing there is a cup facing the bottom part to the working wheel. The bottom of the cup is provided with a central opening for accommodating the threaded portion of a fastening bolt and a cylindrical stop engaging with the inner surface of the fastening bolt head which is made with an annular end groove and a fillet transition between it and the cylindrical surface of the fastening bolt. The outer side of the fastening bolt head is provided with an annular groove and a projection cut to interact with a mounting tool in the form of a wrench. A fillet transition is made between the projection and the annular groove, and the fairing is additionally provided with a cover.

EFFECT: increased reliability.

4 cl, 3 dwg