| 摘要 |
<p>A pump frame (7) comprises a connection port (17) in an upper portion thereof, an inflow port (19) in a lower portion thereof, and a pumping flow passage (21) for providing communication between these ports, and is mounted to a ship bottom (1b) such that the inflow port (19) is open in the water near a stern (1a). A pump casing (9) is fixed in upright fashion to an upper portion of the pump frame (7). Provided vertically in the pump casing (9) is an impeller shaft (33), on which is provided an impeller (11) for sucking water below the sip bottom (1b) through the inflow port (19) to pressurize the same. The water pressurized by the impeller (11) is jetted rearwardly of the stern (1a) through a discharge pipe (13) whereby a marine vessel (1) is propelled. Such water jet propulsion device (5) provides a suction performance free of cavitation and a high propelling performance. <IMAGE></p> |
