Hydraulic jet propulsion apparatus for boats
AssigneeContra Jet WJPS NZ Ltd.
InventorsRichard Gwyn Davies, Barry John Davies
Life of this patent
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Abstract
A water jet propulsion unit including an intake section, a pump section having a pair of counter-rotating impellers mounted side by side on parallel driving shafts in separate cylindrical passages through the pump section and a mixing discharge section ending in a discharge nozzle. The mixing/discharge section is adapted to converge the flows of water discharge from the impellers to neutralise non-axial flow components from one impeller by non-axial flow components from the other impeller to maximise axial flow out of the mixing/discharge section. The unit may be operated as a high mass/low pressure unit or low mass/high pressure unit.
Claims19
A water jet propulsion unit comprising:
- an intake section,
- a pump section having a pair of separate cylindrical passages therethrough, and
- a mixing/discharge section ending in a discharge nozzle,
- the pump section and the mixing/discharge section being in smooth communication with each other, and
- a pair of impellers in said pump section rotatable in opposite directions on parallel axes in a substantially side by side configuration, one within each said cylindrical passage,
- said mixing/discharge section converging the flows of water being discharged from said pair of impellers in a manner which substantially neutralises non-axial flow compounds from one said impeller by non-axial flow components from the other said impeller and maximises axial flow out of said mixing/discharge section.
A water jet propulsion unit comprising:
- an intake section,
- a pump section having two pairs of separate cylindrical passages therethrough, and
- a mixing/discharge section ending in a discharge nozzle,
- the pump section and the mixing/discharge section being in smooth communication with each other,
- two pairs of impellers in said pump section rotatable in opposite directions on parallel axes in a substantially side by side configuration, one impeller within each said cylindrical passage,
- said mixing/discharge section converging the flows of water being discharged from said two pairs of impellers in a manner which substantially neutralises non-axial flow compounds from one said impeller by non-axial flow components from another said impeller and maximises axial flow out of said mixing/discharge section.
Dependencies are inferred from the claim text.