JPH05278683A - Water-jet introduction type steering cylinder apparatus for ship - Google Patents

Abstract

PURPOSE:To provide a water-jet introduction type steering cylinder apparatus for ship which is so arranged as to cause a neutral condition to be stably maintained and minimize the navigation resistance. CONSTITUTION:A steering cylinder 2 is so disposed, at the back of a propelling water- jet injection nozzle 1 provided at a stern, as to permit introduction thereinto of a water jet from the injection nozzle 1, the steering cylinder being thereby made able to be rotate to the right and to the left. A horizontal operating shaft 4 which is rotated by a hydraulic device 3 is laterally provided in the vicinity of a bottom rear portion of the steering cylinder 2. On the other hand, a plurality of flow conversion plates 6 enabling a conversion in flow of the water jet to the forward direction are provided in a steering-cylinder bottom opening formed between the operating shaft 4 and a bottom portion of the steering cylinder 2 near a front end thereof. A flap 5 capable of closing the channels formed between the flow conversion plates 6 in a substantially laid condition is mounted to the operating shaft 4. Through control of the rocking motion of the flap 5, change-over between the forward and backward movements of a hull can smoothly be performed, thus enabling retention of the hull at a neutral condition and reduction in the navigation resistance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water jet introduction type steering tube device for a marine vessel, in which a steering tube into which a water jet is introduced can advance, neutrally hold and reverse a ship.

[0002]

2. Description of the Related Art In recent years, the speed of ships has been increasing, and hydrofoil ships that lift the ship to the surface of the water by the lift force of the wings protruding below the bottom of the ship, or jet high-speed air from around the bottom of the ship. Air-cushion ships such as hovercraft, which run with the reaction force levitating the hull above the surface of the water, are being put to practical use as passenger ships.

Water jet propulsion ships also belong to these high-speed boats, and the seawater boosted by a pump is used for 25 to 40 m.
It ejects from a water jet ejection nozzle (diffuser) installed at the stern at the second speed, and uses the reaction force as the propulsive force.

By the way, a conventional steering device for a water jet propulsion ship (a water jet introduction type steering cylinder device for a marine vessel) is installed behind the jet nozzle, and when the hull is turned, the steering cylinder is moved by a hydraulic cylinder or the like. It is performed by moving to the left and right to change the direction of the jet water. Further, the backward movement of the hull is performed by a mechanism for ejecting jet water toward the bow direction (forward).

Conventionally, a mechanism for reverse movement of a hull is as shown in FIG. 2, and when the vehicle is in reverse, the bucket 11 is lowered from above the steering cylinder 2 while blocking the jet flow, so that the bucket 11 is moved to the lower rear portion of the steering cylinder 2. The flow of the water jet is guided to the commutation port 12 which is fixed and connected and has a certain length.

[0006]

By the way, in the conventional water jet introduction type steering cylinder device for a ship as described above, the bucket 11 as the reverse mechanism is designed to be lowered while blocking the jet flow. There is a problem that it becomes extremely difficult to maintain the neutral state of the ship (a state in which neither forward movement nor reverse movement occurs).

Further, since the commutation port 12 provided at the lower portion has a certain length, the wall portion of the commutation port 12 scratches the sea surface during traveling, which is a resistance to traveling. There are also problems. The present invention is intended to solve such a problem, and forms a bottom opening provided with a plurality of commutation plates at the bottom of the steering cylinder, and at the same time, installs an operating shaft at the bottom rear end of the steering cylinder. By providing a flap that can rotate about the center,
An object of the present invention is to provide a marine water jet introduction type steering cylinder device capable of stable forward / reverse switching control with less traveling resistance.

[0008]

In order to achieve the above-mentioned object, a marine water jet introduction type steering cylinder device of the present invention is provided behind a propulsion water jet ejection nozzle provided at the stern. It is equipped with a steering cylinder that can be controlled to turn to the left and right so that a water jet can be introduced, and a horizontal operating shaft that is rotationally controlled by a hydraulic device is provided laterally near the rear end of the bottom of the steering cylinder. In addition, a plurality of commutation plates capable of diverting the flow of the water jet forward are provided in the steering cylinder bottom opening formed between the operating shaft and the bottom front end of the steering cylinder. A flap that can close the flow path formed between the commutation plates in a substantially horizontal laid state and can close the rear opening of the steering cylinder in an inclined standing state is attached to the operating shaft. It is characterized in that.

[0009]

In the above-described marine water jet introduction type steering cylinder device of the present invention, when switching the forward state of the hull to the reverse direction, the operating shaft equipped with the flap is gradually rotated by the hydraulic device, and the jet water is jetted by the flap. The jet flow is regularly divided while being operated so as to be scraped off, and the jet direction is changed from the horizontal direction to the vertical downward direction without causing turbulence.

Then, a plurality of commutation plates provided at the bottom of the steering cylinder further adjusts the jet water directed vertically downward and ejects the jet water in the bow direction (forward).

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A marine water jet introduction type steering cylinder device as an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view thereof.

As shown in FIG. 1, in this embodiment, a steering cylinder 2 is arranged behind the propulsion water jet jet nozzle 1 provided at the stern so that the water jet from the jet nozzle can be introduced. Has been done. The steering cylinder 2 can be moved left and right by a turning mechanism 7 driven by a hydraulic cylinder (not shown), whereby turning control of the ship is performed.

A horizontal operating shaft 4 which is rotationally controlled by a hydraulic device 3 is provided laterally near the rear end of the bottom of the steering barrel 2, and the operating shaft 4 and the front end of the bottom of the steering barrel 2 are located near the bottom. A plurality of curved commutation plates 6 capable of diverting forward a flow of a vertically downward water jet, which will be described later, are provided in a bottom opening of the steering cylinder 2 formed between the two.

Further, one flap 5 is attached to the operating shaft 4, and the flap 5 can close the flow path formed between the commutation plates 6 in a horizontal laid state, and Steering tube 2 in an upright position with an inclination of approximately 45 ° from the horizontal direction
It is formed so that the rear opening can be closed.

With this structure, the following effects can be obtained in the marine water jet introduction type steering cylinder device of this embodiment.

That is, when the vehicle is moving backward, the operating shaft 4 is controlled to rotate about 45 ° to form an inclined surface of the flap 5, which closes the rear opening of the steering cylinder 2 and the nozzle 1
It is possible to turn the direction of the jet flow coming from almost vertically downward. (The state of FIG. 1) At that time, the flap 5 gradually cuts up the jet water while gradually standing up to divide the jet water, so that the jet flow is not disturbed and the flow is smoothly distributed. be able to. And
The jet flow turned downward in the vertical direction is rectified by the commutation plate 6 which is curved in an arc shape in the rearward direction, and is jetted forward. Therefore, the reverse of the hull is carried out.

Further, in order to divide the water jet from the nozzle 1 into a half and a half respectively into the rear and the front to keep the hull in a neutral state in which neither the forward nor the reverse is performed, the flap 5 is provided with the rear end opening of the steering cylinder 2. Is controlled so as to be located in the middle of the standing position for closing the flow path and the horizontal position for closing the flow path between the commutation plates 6.

On the other hand, during normal forward propulsion, the flap 5 is horizontally lowered on the bottom surface, and the jet flow in the direction of the arrow is ejected rearward as it is.

As described above, the turning mechanism 7 and the flap 5 enable all kinds of marine vessel maneuvering such as forward movement, neutral holding, backward movement and turning, and the neutral state can be stably maintained. Further, since there is no protruding portion such as a conventional commutation port (see reference numeral 12 in FIG. 2) in the steering cylinder 2, there is also an advantage that the traveling resistance is reduced.

[0020]

As described above in detail, according to the marine water jet introduction type steering tube device of the present invention, the flap mounted on the actuating shaft near the rear end of the bottom gradually rises from the bottom surface of the steering tube. Therefore, the jet of the water jet acts to assist the movement of the flap, and the jet flow is not disturbed, and it is as if the jet flow is scraped off by the flap and the direction is smoothly changed. The effect that the neutral state can be stably maintained is obtained.

Further, since the commutation plate attached to the bottom guides the diverted jet flow toward the bow direction (forward), the hull can be moved backward efficiently, and the steering cylinder has a conventional structure. Since it does not have a projecting commutation port, it has significant advantages such as preventing scratches on the sea surface when traveling and increasing running resistance.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a marine water jet introduction type steering cylinder device as one embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a conventional marine water jet introduction type steering cylinder device.

[Explanation of symbols]

 1 Water propulsion nozzle for propulsion 2 Steering cylinder 3 Hydraulic device 4 Operating shaft 5 Flap 6 Commutation plate 7 Turning mechanism

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuhiro Kamide 2-1-1, Niihama, Arai-cho, Takasago-shi, Hyogo Mitsubishi Heavy Industries, Ltd. Takasago Plant (72) Yutaka Kawada Niihama, Arai-cho, Takasago-shi, Hyogo 1-1 Mitsubishi Heavy Industries, Ltd. Takasago Laboratory (72) Inventor ▲ Tomonari Takata 2-1-1, Niihama, Arai-cho, Takasago-shi, Hyogo Prefecture Mitsubishi Heavy Industries Ltd. Takasago Laboratory (72) Inventor Ryoichi Oimatsu Nagasaki-shi No. 1 Satoshinouramachi Mitsubishi Heavy Industries Ltd. Nagasaki Shipyard

Claims (1)

[Claims] 1. A steering cylinder provided behind a propulsion water jet ejection nozzle provided at the stern so as to be able to introduce a water jet from the ejection nozzle and capable of turning control to the left and right, and the same steering. A horizontal operating shaft, which is rotationally controlled by a hydraulic device, is provided in the lateral direction near the bottom rear end of the cylinder, and a steering cylinder bottom opening formed between the operating shaft and the bottom front end of the steering cylinder. Is provided with a plurality of commutation plates capable of commutating the flow of the water jet forward, and a flow path formed between these commutation plates can be closed in a substantially horizontal laid state and can be inclined. A water jet introduction type steering cylinder device for a marine vessel, wherein a flap capable of closing a rear opening of the steering cylinder in the standing state is attached to the operation shaft.