JPH0840377A - Water jet propulsion device for ship - Google Patents

Abstract

PURPOSE:To surely prevent sideway leakage of jet water at the time of backing by symmetrically installing in a duct a pair of buckets of the same form, which have a side liquid-tightly engaged with the inner surface of the cylindrical side plate of the duct in such a manner as to slide in the interior of the duct. CONSTITUTION:A substantially bottomless cylinder duct 7 having an opening part 7c extending about 120 deg. at the back is integrally formed in the downstream part of a discharge nozzle 11, and a pair of buckets 9, 10 are rotatably stored in the duct 7. In the case where opening parts 9e, 10e of both buckets 9, 10 are matched with the opening part 7c of the back of the duct 7, a jet stream (a) is jetted as a jet stream (b) to perform going ahead. In the case where the opening part 7c of the back of the duct 7 is closed by side walls 9b, 10b of both buckets 9, 10, a jet stream (a) is jetted as a jet stream (d) from an opening of a bottom plate 9a to perform backing astern. At this time, the respective side walls 9b, 10b of the buckets 9, 10 are liquid-tightly brought into sliding contact with a cylindrical side plate 13 to surely prevent sideway leakage of jet water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water jet propulsion device for a ship, and more particularly to a water jet propulsion device for a ship which is capable of preventing the jet water from leaking sideways during reverse travel.

[0002]

2. Description of the Related Art In a conventional water jet propulsion device for a ship, as shown in FIGS. 9 and 10, a duct 2 is swung by a swivel shaft 1a at a rear end portion of a discharge nozzle 1 (left end portion of FIGS. 9 and 10). Hydraulic cylinder 3 for steering, which is installed so that
By turning the duct 2 by the operation of 3, the direction of the jet jet ejected from the opening formed in the rear surface of the duct 2 can be changed.

Further, a reverse flap 4 for closing the rear front surface of the duct 2 to generate a reverse flow is attached to a lower portion of the rear end of the duct 2 so as to be capable of undulating by a rotary shaft 2a, and a reverse hydraulic cylinder 5 is provided. When the reverse flap 4 is rotated counterclockwise from the position shown by the solid line in FIG. 10 to the position shown by the chain double-dashed line by the operation of, the opening at the rear front of the duct 2 and the opening at the bottom of the duct 2 are opened. Thus, the jet jet can be jetted toward the front neck (rightward in FIGS. 9 and 10) through the current-flow louver 6. Reference numerals 3a and 5a indicate hydraulic rubber hoses of the hydraulic cylinders 3 and 5, respectively.

[0004]

In the conventional water jet propulsion device for a ship, the lateral control of the jet jet is performed by changing the direction of the duct 2 pivotally attached to the discharge nozzle 1 as described above. It is composed. Therefore, there is a space S between the outlet of the discharge nozzle and the inlet of the duct in order to avoid mutual interference when the duct turns. Separate hydraulic cylinders are provided for steering and reverse.

By the way, such a conventional water jet propulsion device for a ship has the following problems. At the time of reverse operation, when the jet jet is diverted by the reverse flap, an internal pressure in the duct is raised or a reverse flow is generated, and a part of the jet water is discharged from the gap S between the outlet of the discharge nozzle and the inlet of the duct. There is a problem that jetting and scattering to the surroundings occur, so-called sideways, which lowers the backward efficiency slightly and causes seawater to easily scatter to the quay when the ship is on and off. Since separate drive devices (hydraulic cylinders) are required for the marine vessel maneuvering operation and the reverse operation, the number of hydraulic lines and various joints to the outside of the ship increases, and the structure must be complicated.

An object of the present invention is to provide a simple and high-performance water jet propulsion device for a ship which solves the above problems.

[0007]

In order to achieve the above-mentioned object, a water jet propulsion apparatus for a ship according to the present invention is provided with a pump installed on a hull and seawater which is installed on the stern and pressurized by the pump. With a duct injected through a discharge nozzle, the duct is configured as a bottomless substantially cylindrical body composed of a top plate and a cylindrical side plate integrally formed at the downstream end of the discharge nozzle, The rear side of the cylindrical side plate is provided with an opening capable of ejecting the pressurized seawater as a jet jet, and a side surface that is slidably and liquid-tightly engaged with the inner surface of the cylindrical side plate of the duct inside the duct. A pair of buckets of the same shape having the same shape are respectively rotatably and symmetrically arranged by the vertical rotation axis of the duct, and jet the jet jet from an opening formed in the rear front surface of the cylindrical side plate of the duct. The operation of adjusting the ejection angle and the operation of closing the opening and reversing the jet jet to eject the jet jet as a reverse flow from the bottom surface of the pair of buckets can be performed by the rotation of the pair of buckets. It is characterized by being configured in.

The water jet propulsion device for a ship according to a second aspect is the water jet propulsion device for a ship according to the first aspect, wherein the opening provided in the duct is located behind the cylindrical side plate of the duct. About 120 ° in front
Comprising a notch section, the bucket is formed in a shape in which a cylindrical body composed of a flat top plate, a substantially hemispherical bottom plate, and a cylindrical side plate is fan-shaped with a central angle of approximately 120 °, It is characterized in that the side plate is notched in approximately half in the circumferential direction to form an inflow portion for the jet jet.

[0009]

In the above-described water jet propulsion device for a ship of the present invention, the hull (including the reverse) of the hull is rotated by rotating the pair of buckets rotatably mounted inside the duct.
Can operate vessels. That is, when a pair of buckets are set at a position where those side plates and the cylindrical side plate of the duct overlap, the outlet side opening of each bucket and the opening formed in the rear front of the discharge nozzle are aligned, and the jet jet Is ejected from the front of the rear of the duct to obtain the thrust just before the hull.

When the two buckets are rotated to the left (or right) while keeping the correlation of the pair of buckets in this state, the outlet side opening of each bucket is left (or right) in the opening of the cylindrical side plate of the duct. ) Direction, the jet jet flow is deflected to the left (or right) from the opening of the cylindrical side plate of the duct to be ejected to obtain the steering thrust of the hull.

When the pair of buckets are rotated in opposite directions so that the side plates of the buckets close the openings of the cylindrical side plates on the rear surface of the duct, the jet jets are reversed by the side plates of the buckets. From the opening formed in the bow direction of the bottom plate, the jet is ejected in the bow direction to obtain the reverse thrust of the hull.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A water jet propulsion device for a ship according to an embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a plan cross-sectional view at the time of forward movement, and FIG. 2 is X- of FIG.
Sectional view taken along the arrow X, FIG. 3 is a plan sectional view at the time of maneuvering, FIG. 4 is a plan sectional view at the time of reverse movement, and FIG. 5 is YY of FIG.
6 is a perspective view of the bucket, FIG. 7 is a perspective view of the bucket drive unit, and FIG. 8 is a vertical cross-sectional view thereof.

In this embodiment, a substantially bottomless cylindrical duct 7 is formed integrally with the discharge nozzle 11 on the downstream side of the discharge nozzle 11 formed on the downstream side of the pump body 20. The duct 7 is formed by the duct top plate 7a and the cylindrical side plate 13 into a generally bottomless cylindrical shape. The upper surface of the duct 7 is covered with the duct top plate 7a, but the bottom surface is open. On the front side, the cylindrical side plate 13 is cut out over about 120 ° to form an opening 7c as a jet jet outlet. An inlet opening 7b communicating with the discharge nozzle 11 is formed on the front surface of the duct 7.

A double swivel shaft 12 consisting of an inner shaft 12a and an outer shaft 12b is rotatably mounted on a duct top plate 7a via a bearing 8, and inside the duct 7 an inner shaft 12a and an outer shaft 12 are provided.
A pair of buckets 9 and 10 are rotatably arranged independently of each other, respectively supported by and b.

The bucket 9 is, as shown in FIG. 6, a flat top plate 9c, a substantially hemispherical bottom plate 9a, and a cylindrical side plate that can slide in a liquid-tight manner with the inner surface of the cylindrical side plate 13 of the duct 7. 9b
It is formed by a fan-shaped divided cylinder formed by dividing the cylindrical body consisting of and into a central angle of about 120 °, and the upper part is closed by a fan-shaped top plate 9c for about 120 °, and the side surface is about from the exit direction. The hollow body is covered with the side plate 9b for 60 °, and the rest, that is, about 60 ° from the inlet direction, is formed of a hollow body in which a notch portion is formed as the inflow portion 9d of the jet jet in the side plate 9b. The outlets and inlets correspond to the jet jet outlets and inlets when the buckets 9 and 10 are set to the hull forward position shown in FIG.

The bucket 10 is also formed in exactly the same shape as the bucket 9, and both buckets 9 and 10 are symmetrically arranged rotatably inside the duct 7, as shown in FIG. That is, the outer shaft 12b is welded to the bucket top plate 9c of the bucket 9, and the inner shaft 12a is welded to the bucket top plate 10c of the bucket 10. Reference numeral 14 in FIG. 6 indicates the center of rotation of the buckets 9 and 10, and the outer shaft 12b and the inner shaft 12a are welded to the center of rotation 14 of the buckets 9 and 10.

A case 21a of a swing drive device 21 for the buckets 9 and 10 is mounted on the duct top plate 7a of the duct 7. Inside the case 21a, a pair of hydraulic drive type servomotors 22a and 22b are installed.
Gear group 23a for transmitting the rotation of a to the inner shaft 12a and gear group for transmitting the rotation of the servomotor 22b to the outer shaft 12b
23b is provided (see FIGS. 7 and 8). Reference numeral 15 in FIGS. 7 and 8 indicates a seal member.

With the above-described structure, the bucket 9 and the bucket are driven by the servo motor 22b and the servo motor 22a.
Each of the 10 can be independently driven to rotate in the duct 7 in any direction.

As shown in FIG. 1, when the buckets 9 and 10 are in a state in which their one surfaces A and A '(opposite surfaces of the side plates 9b and 10b) are brought into contact with each other, the cylindrical side plate of the duct 7 is formed.
An opening 7c formed on the rear front surface of each of the buckets 13, each bucket 9,
The openings 9e, 10e on the outlet side of 10 are aligned with each other, and at this time, the jet jet a from the discharge nozzle 11 goes straight in the direction of arrow b and is jetted from the rear front surface of the bucket 7, and the thrust in the forward direction is generated. appear.

When the buckets 9 and 10 are rotated in the α ° clockwise direction together with the buckets 9 and 10 (the state of FIG. 3) while maintaining the mutual relationship of the buckets 9 and 10 in this state (the state of FIG. 1), the respective buckets 9 and 10 are
The respective openings 9e, 10e on the respective outlet sides of 10 are also deflected by α °, and the jet jet a from the discharge nozzle 11 is jetted as a steering flow in the direction of arrow c to steer the hull. At this time, the side plates 9b and 10b of each bucket are liquid-tightly overlapped with the cylindrical side plate 13 of the duct 7, so that jet water does not leak sideways.

When the side plates 9b and 10b of the buckets 9 and 10 are swung to the position where the rear front surface of the duct 7 is closed (states shown in FIGS. 4 and 5), the jet jet from the discharge nozzle 11 is cut into the cutouts 9d and 9d. The side plate 9 is injected from 10d into each bucket 9,10.
b, 10b after being inverted, the substantially hemispherical bottom plates 9a, 10
Guided by a, a reverse flow d is ejected toward the bow, and thrust in the reverse direction is generated. At this time, the cylindrical side plate 13 of the duct 7 and the side plates 9 of the buckets 9 and 10
b and 10b overlap each other at the ends (see arrow D in Fig. 4)
Therefore, the jet stream does not leak.

As described above, in the water jet propulsion device for a ship of this embodiment, the pair of buckets 9 and 10 are rotatably mounted in the duct formed in the substantially cylindrical body to rotate the buckets 9 and 10. Since it is configured so that forward thrust, marine vessel maneuvering and reverse thrust can be obtained,
Separate driving devices (hydraulic cylinders) are not required for marine vessel maneuvering and reverse maneuvering, and therefore the structure and weight of the water jet propulsion device can be simplified.

Further, since the buckets 9 and 10 are configured to be liquid-tightly rotatable with respect to the duct 7, the jet water is prevented from leaking (sideways) not only when moving forward and backward but also when maneuvering. As a result, smooth marine vessel maneuvering at the time of berthing and berthing will be possible.

[0024]

As described in detail above, according to the water jet propulsion device for a ship of the present invention, the following effects and advantages can be obtained. (1) Jet water can be spilled from the bucket entrance gap in the conventional device, which makes it possible to improve the efficiency of propulsion and to smoothly land and land when landing and departing. (2) A single drive mechanism for marine vessel maneuvering and reverse operation can be used to simplify the structure of the device body and hydraulic piping system, and at the same time achieve a reduction in device weight and higher reliability. You can

[Brief description of drawings]

FIG. 1 is a plan cross-sectional view of a water jet propulsion device for a ship according to an embodiment of the present invention when it is moving forward.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a plan sectional view at the time of maneuvering the ship.

FIG. 4 is a plan cross-sectional view when the vehicle is moving backward.

5 is a cross-sectional view taken along the line YY of FIG.

FIG. 6 is a perspective view of the bucket.

FIG. 7 is a perspective view of the bucket drive unit.

FIG. 8 is a vertical cross-sectional view of the bucket drive unit.

FIG. 9 is a schematic plan view of a conventional water jet propulsion device for a ship.

FIG. 10 is a detailed vertical sectional view of the same.

[Explanation of symbols]

 1, 11 Discharge nozzle 2, 7 Duct 3 Steering hydraulic cylinder 4 Reverse flap 5 Reverse hydraulic cylinder 6 Transient louver 7 Duct 7a Duct top plate 7b Inlet opening 7c Opening as jet jet outlet 8 Bearing 9, 10 buckets 9a, 10a substantially hemispherical bottom plates 9b, 10b cylindrical side plates 9c, 10c top plate 9d, 10d jet jet inflow part 11 discharge nozzle 12 double swivel shaft 13 cylindrical side plate 15 seal member 20 pump body 21 bucket Swing drive device 21a Case 22a, 22b Servo motor 23a, 23b Gear group

Claims (2)

[Claims] 1. A pump installed on a hull, and a duct installed on the stern for injecting seawater pressurized by the pump through a discharge nozzle, the duct being downstream of the discharge nozzle. It is configured as a bottomless, substantially cylindrical body composed of a top plate and a cylindrical side plate integrally formed at the end, and an opening capable of ejecting the pressurized seawater as a jet jet on the rear front surface of the cylindrical side plate. In the interior of the duct, a pair of buckets of the same shape having side faces that slidably and slidably engage with the inner surface of the cylindrical side plate of the duct are respectively rotatable by a vertical rotation axis of the duct. Symmetrically arranged, the jet jet is jetted from an opening formed in the rear surface of the cylindrical side plate of the duct and the jet angle is adjusted, and the jet jet is closed by closing the jet jet. The water jet propulsion device for a vessel, wherein the operation of reversing and ejecting as a reverse flow from the bottom surface of the pair of buckets is configured to be performed by rotation of the pair of buckets. 2. The water jet propulsion device for a ship according to claim 1, wherein the opening provided in the duct is a notch extending approximately 120 ° in the rear front surface of the cylindrical side plate of the duct, The bucket is formed into a shape in which a cylindrical body composed of a flat plate-shaped top plate, a substantially hemispherical bottom plate, and a cylindrical side plate is fan-divided into a central angle of approximately 120 °, and the side plate is approximately half in the circumferential direction. A water jet propulsion device for ships, characterized in that an inflow portion of the jet jet is formed by cutting out.