Waterjet propelling device of boat
AssigneeIshigaki Company Limited
InventorEiichi Ishigaki
Life of this patent
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Abstract
Rotary vanes having inducer-joined axial-flow vane portions, mixed-flow vane portions collisionlessly connected to the axial-flow vane portions, and centrifugal vane portions collisionlessly connected to the mixed-flow vane portions are wound around an outer peripheral surface of a hub that is continuously curved. The hub is configured with a moderate slope region and a steep slope region. The axial-flow vane portions and the mixed-flow vane portions are wound around the moderate slope region, and the centrifugal vane portions being wound around the steep slope region.
Claims6
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.
Dependencies are inferred from the claim text.