The invention provides a double-stage propeller for a ship, which relates to ship propelling devices. The double-stage propeller for the ship comprises a front engine, a rear engine, a front propeller, a rear propeller and a square tube-shaped housing. The front propeller is mounted on an output shaft of the front engine; and the rear propeller is mounted on an output shaft of the rear engine. The front propeller and the rear propeller have equal diameters and are placed within the square tube-shaped housing with one in front of another. A forward angle between the rotating plane of the front propeller and a left plate of the square tube-shaped housing is not more than 80 DEG. A backward angle between the rotating plane of the rear propeller and the left plate of the square tube-shaped housing is not more than 80 DEG. The rotating planes of the front propeller and the rear propeller are vertical to both a top plate and a bottom plate of the square tube-shaped housing. The front propeller and the rear propeller respectively rotate within the square tube-shaped housing under the driving of the front engine and the rear engine so as to suck the water ahead of them into the square tube-shaped housing and then extrude the water from the backside of the square tube-shaped housing. Compared with the traditional ship propeller, the double-stage propeller for the ship, provided by the invention, has the advantages of large thrust face, low resistance and high efficiency.
Double-stage propeller for ship
2016-01-27
Patent
Elektronische Ressource
Englisch
IPC: | B63H Schiffsantrieb oder Steuerung der Schiffe , MARINE PROPULSION OR STEERING |
SHIP PROPELLER MOUNTING BRACKET, SHIP PROPELLER AND SHIP
Europäisches Patentamt | 2023
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