JPS6226319Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a water jet propulsion vessel.

Figure 1 shows a conventional water jet propulsion vessel. Water sucked in from a water suction port 1 at the bottom of the ship is guided into a duct 2 by the drive of a water jet pump impeller 3, and is ejected from a nozzle 4 as a water jet. The impeller 3 is driven via a shaft 7 connected to the main engine 6. A ship maneuvering nozzle 5 is arranged outside the nozzle 4 that spouts a water jet. 8 is the water surface. 2 and 3 are enlarged horizontal sectional views of the water jet jet nozzle 4 and the ship maneuvering nozzle 5,
During ship maneuvering, as shown in FIG. 3, by changing the direction of the ship maneuvering nozzle 5 to port or starboard, a lateral component of force is generated at the stern and a turning moment is obtained.

However, conventional water jet propulsion vessels do not have the rudder that is attached to general vessels, and have the following drawbacks.

(1) The swing angle of the ship maneuvering nozzle 5 is on the left and right respectively.
The angle is about 30 degrees, and the lateral force component is small.

(2) When the ship is stationary or at slow speed, a turning moment is generated that cannot be generated by the rudder of a general ship, but at relatively high speeds, the lateral force component is much smaller than that of the rudder, and it is difficult to use the rudder. It does not have the same turning power as a general maneuvering ship.

The present invention was devised in view of the above circumstances, and an object of the present invention is to provide a water jet propulsion vessel that has maneuverability equivalent to that of conventional vessels even at relatively high speeds.

For this reason, the high-speed rudder-equipped water jet propulsion vessel of the present invention has a water jet jet nozzle installed at the draft of the stern of the hull, and a ship maneuvering vessel that is fitted around the outer periphery of the nozzle so as to be able to turn to the port or starboard side. It is characterized by being equipped with a nozzle and a rudder disposed at each of the bottom parts of the stern which slope from the deep bottom of the ship centerline to both sides.

The following describes a water jet propulsion boat with a rudder as a first embodiment of the present invention with reference to the drawings.
The figure is a front view of the stern part, and FIG. 5 is a side view of the stern part. The water jet nozzle 5 is located almost at the water surface 8, and the bottom 1 of the ship is inclined from the deepest part 10 of the bottom of the ship.
A rudder 9 is arranged at 1.

Next, the functions and effects of the rudder-equipped jet propulsion vessel of the present invention will be explained. Since the jet propulsion vessel with a rudder of the present invention is equipped with the rudder 9, it has turning performance equivalent to that of conventional vessels at high speeds, and at slow speeds or when stopped, it has a turning force that cannot be obtained with conventional vessels. Obtained by water jet.

6 and 7 show a second embodiment of the present invention, in which FIG. 6 is a front view of the stern section, and FIG. 7 is a side view of the stern section. The structure is the same as that of the first embodiment except that the lower end of the rudder 9 is disposed above the deepest part 10 of the bottom of the ship.

Therefore, in addition to being able to exhibit the same effects as the first embodiment, it also has the advantage of being able to sail in shallow water like the conventional rudderless water jet propulsion boat.

In addition to the above-described embodiments, the present invention can be modified as appropriate, such as using only one rudder in the case of a ship equipped with two water jet propulsion units.

As described above, the rudder-equipped water jet propulsion boat of the present invention has the advantage of improved maneuverability due to the simple structure of providing the rudder at the stern.

[Brief explanation of the drawing]

Figures 1 to 3 show a conventional water jet propulsion vessel, with Figure 1 being a longitudinal sectional view, Figures 2 and 3 being enlarged horizontal sectional views of the nozzle section, and Figures 4 and 5 showing the first implementation of the present invention. Figure 4 is a front view of the stern part, Figure 5 is a side view of the stern part, Figures 6-7 are a second embodiment of the present invention, and Figure 6 is a front view of the stern part. , FIG. 7 is a side view of the stern section. 4... Water jet jet nozzle, 5... Ship maneuvering nozzle, 8... Water surface, 9... Rudder.

Claims (1)

[Scope of utility model registration request] A water jet jet nozzle installed at the draft part of the stern of the hull, a maneuvering nozzle fitted on the outer periphery of the nozzle so that it can turn to the port or starboard side, and a nozzle that tilts from the deepest part of the bottom of the hull centerline to both sides. A water jet propulsion vessel with a high-speed rudder, characterized in that it is equipped with a rudder disposed at each bottom of the stern.