JPH11263293A - Reverser device in water jet propulsion ship - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reverser device which can exhibit high performance at the time of going astern in a water jet propulsion ship. SOLUTION: In a water jet propulsion ship, the jetting cylinder of a reversing jet from a reverser 9 formed at the jetting opening 8 of a water jet is formed into a fork shape, and the jetting opening 10 of the jetting cylinder is opened in such a direction as deviated to the side for a jet generator. It is thus possible to activate the reversed water jet efficiently without hitting the casing of the jet generator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a reversing device for a water jet propulsion ship, and to improve the performance of a reverser when the water jet propulsion ship moves backward.

[0002]

2. Description of the Related Art Conventionally, as an example of a reverser of a water jet propulsion device, there is one as shown in FIGS. FIG. 1 shows a water jet propulsion device mounted on a ship, which discharges a water flow backward from a jet port 2 at the time of forward movement,
The hull is propelled by the reaction force. When the vehicle is moving backward, the reverser 1 is rotated downward to close the jet port 2 at the time of moving forward, so that the reverse jet port 3a installed on the deflector 3 is provided.
The water flow is reversed and released, and the propulsion necessary for reverse travel is obtained. FIG. 2 shows an outboard-mounted water jet propulsion device, in which the reverser 1 is rotated upward during backward movement to block the direction of water flow during forward movement, whereby the water flow is reversed along the reverser 1 and ejected from the jet port 3a. To get the propulsion necessary for reverse.

[0003]

In such a reverser, when the position of the jet port is high in a water jet outboard motor or the like as shown in FIG. 3, the inverted water flow collides with the main body of the propulsion device, and the thrust is reduced. I can't get it. In addition, if the jetting angle is increased with respect to the longitudinal direction of the hull so that the water flow does not collide, the velocity component in the bow direction becomes small and sufficient thrust cannot be obtained. Therefore, there is a drawback in that when the jet port is extended rearward to reduce the jet angle with respect to the longitudinal direction of the hull, the performance of the propulsion device is deteriorated due to effects such as a pipe loss and an increase in the weight of the propulsion device.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a water jet propulsion device capable of sufficiently obtaining a necessary thrust at the time of reversing without deteriorating the performance of the propulsion device. The gist of the invention is that in a water jet propulsion ship, the reversing water flow from the reverser provided at the jet port of the water jet branches right and left and jets out from a pair of left and right openings. The core line of the jet water jet ejected from the water jet is deflected to the side of the water jet generator.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention, as described above, prevents the reversing water flow from hitting the reverser and diverging right and left and colliding with the casing of the water jet generator. It works effectively on the propulsion of the hull. Providing a guide pipe or the like at the jet outlet of the branched jet water stream and jetting the jet water stream in a focused state is more effective for propulsion. Hereinafter, the present invention will be specifically described with reference to the drawings.

[0006]

3 and 4 show the present invention applied to a water jet outboard motor. FIG. 3 schematically shows a water jet outboard motor. This propulsion device has an engine mounted in an upper cowling 6 and a water jet unit below the engine. This unit is provided with a suction port 7 opened into the water at the lowermost portion thereof, a jet port 8 communicating with the suction port 7, a reverser 9 for closing the jet port 8 when moving backward, and a pair of left and right jet ports 10 when moving backward. The water jet propulsion device is fixed to the transom 12 with a clamp bracket 11.

FIG. 4 shows details of the water jet unit. The water taken into the casing from the suction port 7 is pressurized by an impeller 14 connected to the engine by a main shaft 13, rectified by guide vanes 15 installed immediately after that, passes through an elbow 16, and is jetted out The flow rate is adjusted by the nozzle 17 and discharged from the jet port 8, and the hull is propelled by the reaction force. Also,
The reverser 9 rotates downward from above and closes the jet port 8 at the time of forward movement, thereby guiding the water flow to the jet port 10 at the time of reverse movement and inverting and discharging in the bow direction. As a result, it is possible to obtain the thrust during reverse travel.

[0008]

At this time, according to the present invention, a pair of left and right jet ports are provided at the time of reverse movement as shown in FIG. 5, and the direction thereof avoids the water jet generating device (main body of the propulsion device). It can pass through the side without hitting this, and can use the thrust of the reversing water flow efficiently.

[Brief description of the drawings]

FIG. 1 is a side view of a conventional water jet propulsion device of this type.

FIG. 2 is a side view of another conventional example.

FIG. 3 is a side view of the propulsion device according to the present invention, showing a case where the propulsion device is an outboard motor.

4 is a vertical sectional side view showing the internal structure of the propulsion device shown in FIG. 3;

FIG. 5 is a rear view of the lower portion of the propulsion device shown in FIG. 3;

FIG. 6 is also a side view of FIG.

[Description of Signs] 8 Spout 9 Reverser 10 Spout

Claims (1)

[Claims] 1. In a water jet propulsion ship, a reversing water flow from a reverser 9 provided at an outlet 8 of a water jet is branched right and left and is ejected from a pair of left and right outlets 10. A reversing device in a water jet propulsion ship, wherein a core line of a jet water flux ejected from the water jet 10 is displaced to the side of a water jet generating device.