WATER-JET PROPULSION AND STEERING COMPLEX Russian patent published in 2003 - IPC

FIELD: shipbuilding; development of water-jet propulsors with reverse steering complex. SUBSTANCE: proposed complex includes water duct, impeller with hub fairing mounted on shaft with bearings, straightening set and reverse steering unit with swivel deflector mounted after nozzle. Cross sections of nozzle have shape elongated in horizontal direction after inlet circular section of nozzle. Ratio of width to height is equal to 2:10. Profile of cross sections of impeller hub copies profile of cross sections of inner loop of nozzle. Straightening set is formed by nozzle walls, fairing and profiled struts. Reversible steering unit is provided with limiting plate and two drive rudders. Side walls of cross section of nozzle have form of part of circle after inlet circular section and upper and lower walls are limited by chords of segments. Circular shape of nozzle section changes to outlet section elongated horizontally. Profile of impeller fairing is transformed into horizontal line at nozzle outlet. Impeller hub fairing is secured to nozzle walls by means of four streamlined profiled struts. Side walls of deflector have through holes. Rudders have profile of straight-cheek wedges. One bearing of tail section of impeller shaft is made in form of supporting bearing and other bearing is made in form of thrust bearing; bearings are lubricated with water. EFFECT: reduced sizes of propulsor; enhanced efficiency; minimization of loads; facilitated procedure and enhanced ecological safety. 9 cl, 2 dwg