Thrust generating apparatus

Abstract

A thrust generating apparatus is provided that can transform a spouting water flow having a small diameter into a water flow having a large diameter, and that can be provided at the bow or the stern end. A bell-shaped nozzle is coupled to an ejection port of a pump water flow, a ring having a blade-shaped cross section is disposed inside the nozzle, and a shell-shaped cone is disposed inside the ring on the center line of a water flow. Thereby, an ejection flow is straightened, and a thrust is generated. In addition, the bottom of the cone is open, a slit is further provided at a shoulder portion of the cone forward of the ring, and the water flow inside the cone is in communication with a water flow outside the cone. Furthermore, a rotating door is provided that enables the nozzle to pivot toward a shell plating opening on a port side or a starboard side, and that closes or opens the shell plating opening in accordance with the position of the nozzle.

Description

technical field [0001] The present invention relates to a thrust generating device of a lateral thruster which can be arranged at the bow end or stern end of a displacement ship, and a revolving door which automatically opens and closes an opening of an outer plate in conjunction with it. Background technique [0002] A lateral propeller is a device installed at the bow or stern of a ship to move the ship laterally. Most of the lateral thrusters are installed in large ships, especially ships such as ferries with many offshore berthing times. Smaller boats, on the other hand, are less likely to have side thrusters because they are relatively easy to maneuver, or move the boat with little effort. [0003] However, with the shortage of manpower and the aging of the crew in recent years, the demand for the function of using side thrusters in small ships has also increased. Therefore, Japanese Patent Application Laid-Open No. 5-16594 proposes a side thruster that jets seawater ...

AI Technical Summary

Problems solved by technology

[0010] However, due to the overall size of the device, the complexity of the shaft system for rotating the propeller, and constraints on the ship's interior layout, the side thrusters had to be installed close to the parallel parts of the hull, and the length of the pipe to be longer than necessary, resulting in a drop in thrust

Therefore, if the opening position of the inlet and outlet of the ducts of the lateral thrusters is moved to the front of the waterline with an angle of incidence, the resistance of the hull will increase, and it will also lead to the inflow of other objects

Therefore, if protective devices are installed at the openings at both ends of the entrance and exit, the resistance of the passage itself will increase.

The above situation is no exception for the stern, because of these constraints make it difficult to configure the lateral thrusters in the most suitable position

[0011] In addition, with regard to the direction of thrust generation, in order to obtain equal thrust in both forward and reverse directions, it is only possible to achieve it by rotating the main body of the propeller, but its implementation will bring about complicated problems in the mechanism

[0012] Also, the wake of the propeller propeller turns into a vortex, which is less efficient compared to the straight-in water flow of the jet of a general purpose pump

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