JP2515096Y2 - Steering device for water jet thruster - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an improvement of a steering device in a propulsion device of a ship (hereinafter referred to as a water jet propulsion device) that propels by jetting a water jet.

(Prior Art) Unlike a conventional propeller such as a screw propeller, a water jet propulsor is equipped with a steering device itself (for example, Japanese Patent Laid-Open Nos. 50-21492 and 61-257395).
No. 62, JP-A No. 62-205894, No. 50-4488, No. 50-3
No. 8091, Japanese Utility Model Publication No. 54-23497).

This is because the wake of the thruster, that is, the jet jet, is discharged into the air and propelled by its reaction force, so that the wake of the thruster cannot be used as in the case of the conventional rudder. Therefore, it has a configuration in which the jet jet flow is directly deflected for steering. Also, since water cannot be sucked in from the air even in reverse, the reverse thrust is also generated by the deflection of the jet jet of 90 degrees or more (for example, Japanese Patent Laid-Open No. 21492 / 50-21). 38091 publication, etc.).

Here, a typical configuration of a conventional steering device for a water jet propulsion device will be described with reference to FIG.

The water jet propeller is a pump P that is rotated by a drive shaft 3 from a suction port 2 provided in the bottom of the hull 1.
This is a type in which water sucked up by the radial impellers 5a on the hub 5 is ejected backward from the discharge nozzle 7 at the rear end of the propulsion device casing 4. In the case of this conventional example, the steering device is constructed by rotatably attaching another steering nozzle 8 to the rear end portion of the propulsion device casing 4 via a fixing portion 8a provided outside the discharge nozzle 7. Has been done. That is, by swinging the steering nozzle 8 around the vertical axis 9 in the horizontal plane by an actuator such as a fluid cylinder (not shown), the direction of the jet flow is changed to perform the steering function.
The steering nozzle 8 is formed to have a diameter larger than that of the discharge nozzle 7 so that the steering nozzle 8 does not come into contact with the jet flow when going straight. Reference numeral 6 denotes an inner core connected to the hub 5, and 6a denotes a stationary blade radially provided on the inner core.

As described above, in the conventional arrangement of the steering apparatus of the water jet propulsion device, the steering nozzle 8 that swivels in the horizontal plane behind the discharge nozzle 7 that discharges the jet, controls the direction of the jet, and steers is disposed separately. ing. In addition, the movable part 10 that generates reverse thrust by deflecting the jet to the wake side by 90 degrees or more in a vertical plane.
A reverse bucket B composed of a fixed part 11 and a fixed part 11 is arranged. 12 is a pivot of the movable part 10.

(Problems to be solved by the invention) By the way, many ships equipped with water jet propulsion devices belong to high-speed boats. Although high speed boats are essentially required to be light and small, water jet propulsion devices require extra weight and space due to steering device-related additions. Therefore, it is required to reduce the weight and size of this additive.

However, in the above steering mechanism, a separate steering nozzle 8 having a diameter larger than that of the discharge nozzle 7 is provided so as to project rearward by a considerable amount, and the weight becomes heavy and the moment weight increases due to the large amount of projection, resulting in weight distribution. Is getting worse.
Moreover, since the diameter of the steering nozzle 8 is usually larger than the tip diameter of the discharge nozzle 7 so that the jet jet does not directly contact the steering nozzle 8 as described above, a slight dead zone is provided at the neutral position during steering. It is a steering system and has a negative factor on steering performance.

An object of the present invention is to improve the steering mechanism of a water jet propulsion device so as to reduce its weight and size, and to enhance its usefulness as a propulsion device.

(Means for Solving the Problems) In order to achieve the above object, the present invention comprises a discharge nozzle connected to a casing rear end portion of a water jet propulsion device, which includes an upper and lower fixed wall and movable side walls on both sides. In addition to forming a square shape, the movable side wall is rotatably supported on the casing so as to be rotatable about a vertical axis, and maintains a normal nozzle shape when traveling straight, and when steering, the movable side walls on both sides are rotated by a required angle within a horizontal plane. It is a steering device for a water jet propulsion device, characterized in that it is operated to change the direction of a jet jet so as to have a steering function.

(Operation) In the above configuration, the jet flow is jetted straight rearward when the vehicle goes straight, and the movable side wall of the discharge nozzle formed at the rear end of the casing is turned by a desired angle when the vehicle is steered. To give the steering function.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a water jet propulsion device including a steering device according to the present invention. The same components as those in the conventional example described above are designated by the same reference numerals.

In the figure, for example, an opening provided on the bottom of a hull 1 of a high-speed boat is a water jet inlet 2 for water jet, and a water jet propulsion device formed from the inlet 2 to extend in a tubular stern end direction. A casing 4 is arranged inside the hull 1.

A drive shaft 3 is provided horizontally through the casing 4, and the right end of the drive shaft 3 is connected to a drive engine (main engine) (not shown) such as a diesel engine or a gas turbine. At the left (stern side) end of the drive shaft 3, a hub 5 having radial impellers 5a is provided inside the casing 4, so that the drive shaft 3 supports and drives the impeller 5a. There is. The impeller 5a converts the power of the main engine into the form of kinetic energy of water.

At the rear end of the hub 5 having the impeller 5a, an inner core 6 having a streamlined outer shape is formed so as to be connected to the hub 5.
Are provided, and a plurality of stationary vanes 6a are radially provided on the outer periphery of the inner core 6. By the function of this stationary blade 6a,
The swirling flow coming out of the impeller 5a is rectified and converted into propulsion energy as much as possible, thereby improving efficiency as a propulsion device. The tip of the stationary blade 6a is fixed to and supported by the casing 4. The hub 5 is an inner core 6
The drive shaft 3 extended inward is supported by the casing 4 via a bearing (not shown) via the inner core 6 and the vanes 6a.

At the rear end of the casing 4, there is provided a discharge nozzle 7 forming a square outlet so as to be continuous with the discharge nozzle. The jet nozzle discharges a jet jet to convert the kinetic energy of water into thrust. It is like this. The discharge nozzle 7 is configured to have a steering function at the same time. That is, the structure of the discharge nozzle 7 will be described in more detail with reference to FIGS. 2 and 3. It is composed of a pair of channel-shaped movable side walls 7B that slide on both sides during steering, and the shape of the outlet is formed into a rectangle (quadrangle) by these four walls.

The movable side wall 7B is pivotally supported by an actuator 14 provided outside the casing 4 so as to be rotatable about a vertical axis 13a of a hinge 13. When the steering wheel is steered, the movable side wall 7B is rotated by a predetermined angle. It has become. The base end of the actuator 14 is pivotally attached to the casing 4 side, and the rod side is pivotally attached to the movable side wall 7B side. The actuator 14 is designed to operate in conjunction with the steering wheel in the steering room of the ship.

In FIG. 1, reference numeral 10 denotes a reverse bucket movable portion, the base end portion of which is pivotally supported on the casing 4 by a support shaft 12. Further, the above-mentioned lower fixed wall 7A is provided with a backward bucket fixing portion 11 integrally and continuously with the lower fixed wall 7A. When traveling straight, the reverse bucket movable unit 10 is in the position indicated by the solid line, and when traveling backward, it rotates downward and is integrally connected to the reverse bucket fixing unit 11, and the jet flow is deflected downward by 90 degrees or more to generate reverse thrust. It is like this. Also, when the fixed part 11 and the movable part 10 of the reverse bucket are not completely connected together, part of the jet flow becomes forward thrust, and part of it becomes reverse thrust. It is also possible to perform thrust adjustment continuously in reverse and smoothly.

Next, the steering function of the jet propulsion device will be described with reference to FIG.

Fig. 2 shows the condition when going straight, the movable side walls on both sides.
7B is in the position shown by the solid line. In this state, the water flow is jetted straight and smoothly rearward from the discharge nozzle 7 along the inner surface of the casing 4 and the outer surface of the inner core 6.

On the other hand, for example, the movable side wall 7B on the port side as shown by the imaginary line
The actuator 14 rotates (swings) inward, and the starboard side movable side wall 7B rotates (swings) outward to form a steered state. At this time, the jet flow hits the movable side wall 7B and is forcibly deflected from the center line by a certain angle and ejected. As a result, the propulsive force corresponding to the component of the jet thrust is generated, and the ship turns to the right. When steering in the opposite direction, the ship turns to the left. In this way, the function of the movable side wall 7B provides the steering function.

(Effects of the Invention) As described above, according to the present invention, since the portion corresponding to the conventional discharge nozzle is configured as the steering nozzle as it is, the steering wheel that protrudes rearward separately from the discharge nozzle as in the conventional case No nozzles are required, the weight and size of the steering mechanism are reduced, and the weight of the protrusion reduces the moment weight required for steering, improving weight distribution, stability, and responsiveness.

Further, in the past, the dead zone at the time of steering was held at the neutral position, but in the present proposal, since a steering system without such a dead zone can be realized, a steering device with excellent steering performance can be realized, and by extension water jet propulsion. The usefulness of the container itself can be increased.

[Brief description of drawings]

1 to 3 are drawings showing an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view of a water jet propulsion device including a steering device according to the present invention, and FIG. 1 is a view as seen from the arrow X in FIG. 1, and FIG. 3 is a drawing showing the outlet shape of the discharge nozzle in FIG. FIG. 4 is a vertical cross-sectional view of a typical conventional water jet propeller. 1 ... Hull, 2 ... Suction port, 3 ... Drive shaft, 4 ... Casing, 5 ... Hub, 5a ... Impeller, 6 ... Inner core, 6a ... Stationary vane, 7 ... Discharge nozzle, 7A …… (up and down)
Fixed wall, 7B ... Movable side wall, 13 ... Hinge, 13a ... Vertical axis, 10 ... Reverse bucket movable part, 11 ... Reverse bucket fixed part, 14 ... Actuator.

Claims (1)

(57) [Scope of utility model registration request] 1. A discharge nozzle connected to a rear end portion of a casing of a water jet propulsion device is composed of upper and lower fixed walls and movable side walls on both sides to form the discharge nozzle in a rectangular shape, and the movable side wall is a vertical axis. It is pivotally supported on the casing rotatably around, and maintains the normal nozzle shape when going straight,
A steering device for a water jet propulsion device, characterized in that, during steering, the movable side walls on both sides are turned by a required angle in a horizontal plane to redirect the jet jet to provide a steering function.