Ship pod-mounted hydrojet propeller unit driven by a hollow electric motor

Abstract

The hydrojet boat submerged propulsions system is low noise and has good output. It comprises principally a hydrojet propulsion system comprised of a hydraulic screw ( 7 ) feeding a helico-axial pump ( 8 ) emerging through downstream guide vanes ( 9 ). A nozzle ( 10 ) completes the assembly, which is supplied by lateral intakes ( 6 ). The electrical motor ( 11 R, 11 S) is represented axially, but can also be radial. The shaft ( 3 ) is rotationally mounted by means of hydraulic thrust bearings ( 4 V, 4 R). The system can be oriented in azimuth. Application in ship and submarine propulsion.

1 . A ship's hydrojet engine arranged in a pod and utilizing an electrical motor, comprising: 
 a pod ( 2 ,  12 );    an electrical motor ( 11 R,  11 S,  21 R,  21 S) arranged in the pod;    a rotating engine assembly ( 16 ,  17 ,  8 ,  9 ) driven by the rotor of the electrical motor, and    an outlet nozzle ( 10 ), fixed to the rear of the pod ( 2 ,  12 ), downstream of the rotating engine assembly, and    guide vanes ( 9 ) fixed to the pod ( 2 ,  12 ),    characterized in that the rotating engine assembly comprises    a hydraulic screw ( 7 ,  17 ) and    a helico-axial pump ( 8 ) placed downstream and integral with the hydraulic screw ( 7 ,  17 ) and    in that the electrical motor is of the hollow type that is, having a wide diameter rotor ( 1 R,  21 R) and a stator ( 11 S,  21 S) and hollow in its central part in order to surround the rotating engine assembly and so that the rotor ( 11 R,  11 S) is fixed around the rotating engine assembly.    
     
     
         2 . The ship's engine according to  claim 1 , wherein the rotor ( 11 R,  11 S) is placed around the hydraulic screw ( 7 ,  17 ).  
     
     
         3 . The ship's engine according to  claim 1 , wherein it comprises lateral intakes ( 6 ,  16 ) for entry of the water into the rotating engine assembly.  
     
     
         4 . The ship's engine according to  claim 1 , wherein the rotating engine assembly is mounted on a shaft ( 3 ) mounted rotationally in the pod ( 12 ) by means of hydraulic thrust bearings ( 4 V,  4 R).  
     
     
         5 . The ship's engine according to  claim 1 , wherein the electrical motor ( 11 R,  11 S) is of the axial field type.  
     
     
         6 . The ship's engine according to  claim 1 , wherein the electrical motor ( 21 R,  21 S) is of the radial field type.