WATER JET Russian patent published in 2023 - IPC B63H11/08 

FIELD: shipbuilding.

SUBSTANCE: invention relates to the field of shipbuilding, namely to jet propulsion. Jet propulsion unit contains a housing, inside of which there is a conduit, a propeller shaft with an impeller with blades mounted on it, a straightener and a jet nozzle. The housing includes a water intake, a shell of the impeller and a housing of the straightener connected in series. The impeller shell has an annular groove on the inner surface. A shroud ring is rigidly connected to the blades of the impeller, which covers the blades of the impeller and is located in the annular groove with a gap in relation to the walls of the annular groove. The impeller shell has at least one drainage hole in the groove area.

EFFECT: increased efficiency of the water jet propulsion and its efficiency due to the creation of additional axial force, which increases the emphasis created by the impeller.

4 cl, 2 dwg