Patent ID: 6923694
Filing Date: 2005-08-02
Classification: B63H,F04D

Abstract:
1. A waterjet propelling apparatus for vessels, configured as a single-staged turbopump including an impeller having rotary vanes wound around a hub, and a pump casing configured to accommodate the impeller, wherein a rotary vane comprises an axial-flow vane portion with an inducer-joined configuration, a mixed-flow vane portion collisionlessly connected to the axial-flow vane portion, and a centrifugal vane portion collisionlessly connected to the mixed-flow vane portion, the hub including an outer continuously curved peripheral surface having a moderate slope region and a steep slope region, the axial-flow vane portion and the mixed-flow vane portion of the rotary vane are wound around the moderate slope region of the outer peripheral surface of the hub, the centrifugal vane portion of the rotary vane is wound around the steep slope region of the outer peripheral surface of the hub, and the axial-flow vane portion of the rotary vane has an inducer part of a triangular curve form confronting a downstream end of a straight-tubular portion of the pump casing, and protruding upstream of a front stage portion of the hub.