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US 2002/0160668 A1Published application
Waterjet propulsion unit
AssigneeHRP Nederland B.V.
InventorHendrik Terlouw
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AssigneeHRP Nederland B.V.
InventorHendrik Terlouw
Estimating the term…
The invention aims to increase the efficiency of a waterjet propulsion unit with a jet tube, open at its upper and lower end and accommodating a rotating water propulsion means, and with in its outflow opening a rotatable grid of essentially mutual parallel guide plates which cross the axis of the propulsion means under an acute angle, in which a great power can be handled, in that the jet tube is surrounded at the outside of the inlet end by a guide surface having a spherically curved cross-section, and ends at the inlet end in a converging chamber of which two opposite walls an acute angle include with the axis of the propulsion means, said chamber carrying at the outflow end the grid of guide plates of which the plates are parallel with the horizontal end edges of said walls, the whole being rotable together with this grid around the axis of the propulsion means.
Water jet propulsion unit, comprising a jet tube, open at its upper (inlet) and lower (outlet) end, and accommodating therein a rotatingly driven propulsion means with in the outflow opening of the unit a rotatable grid of essentially mutually parallel guide plates crossing the axis of the propulsion means under an acute angle, in which the jet tube is, outside the inlet end, surrounded by a curved guide surface which has, in cross-section in a radial plane through the axis of the jet tube and starting from the wall of said tube an at least semicircular configuration, and ends at the outlet end in a guide chamber in which the end edges of two opposite walls, which bound the outflow opening of said chamber, cross the axis of the tube under an acute angle, said grid of plates being provided in said outflow opening with at least the end parts of the plates parallel to said end edges, the whole being rotatable, together with the grid, around the axis of the propulsion means.
Dependencies are inferred from the claim text.