FASTENING UNIT OF A PUMP'S IMPELLER Russian patent published in 2007 - IPC F04D29/20 

FIELD: the invention refers to structural units of vertical blade pumps and may be primarily used on an atomic power plant in main circulatory pump units of the first contour of a heat-transfer agent.

SUBSTANCE: the fastening unit has a fairing with a smooth opening for the central screw, locking the surface of the fairing. The end face of the fairing, on which a clamping ring projection is made and the end face of the driving disk of the impeller, in which an axial deepening is fulfilled are mated with possibility of their relative axial displacement. The threaded opening for the central screw, whose head locks the surface of the driving disk fulfilled in the end face of the pump's shaft. The unit has a flange, encircling the central screw and mated with the end face of the pump's shaft with the aid of a screw connection, whose thread openings are fulfilled in the end face of the pump, and the smooth - in the indicated fairing. A radial projection is fulfilled on the rod of the central screw under its head with possibility of an elastic interaction with the fairing.

EFFECT: the invention prevents the influence of loadings conditioned by vibrations of the impeller and also by temperature expansion of the pump's elements, reliability of the installation of the fairing and easing of its coordination at assembling the fastening unit.

3 dwg