JPS6194892A - Device for reducing rolling of hull - Google Patents

Abstract

PURPOSE:To prevent the increase of hull resistance by providing a fin stabilizer pivotable about the lateral axis of the hull and pivotable horizontally to retreat the blade end in high speed sail. CONSTITUTION:A hull rolling restraining fin 2 disposed to project sidewise of the shell 1 of the hull under the water is pivoted about the lateral axis to reduce rolling. In high speed sail, the fin 2 is pivoted horizontally to retreat the blade end. In normal sail (high and medium speed sail) the fin 2 is retreated to prevent the increase of hull resistance and provide the sufficient effect of restraining rolling in low speed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for reducing WAIA drift of a ship during navigation.

[Conventional technology]

As a device to reduce the rolling motion of a ship while sailing,
Fin stabilizers have been used in the past, with rotatable fins on both sides of the hull for suppressing hull roll. Taking advantage of the lift generated,
Efforts are being made to reduce the rolling motion of the ship.

[Problem that the invention seeks to solve]

By the way, in the case of such conventional ship roll reduction devices, when the ship is traveling at low speed, the flow velocity around the fins is low, so the lift of the fins is insufficient, making it impossible to sufficiently reduce the ship roll. There is.

However, oceanographic research vessels often navigate at low speeds during observation work, and it is absolutely necessary to reduce rolling during low-speed navigation due to work efficiency and safety issues.

Therefore, in order to obtain the full effect of the fins even during low-speed navigation, it is possible to increase the area of the fin blades, but in this case, the fins will become larger and the This will lead to an increase in hull resistance.

In view of the above-mentioned problems, the present invention prevents the ship from rolling not only when the ship is traveling at high and medium speeds but also when the ship is traveling at low speeds without causing an increase in hull resistance due to the fins during normal navigation. It is an object of the present invention to provide a ship body sway reducing device capable of sufficiently reducing the sway.

[Means for solving problems]

For this reason, the ship body roll reduction device of the present invention is provided with rotatable fins for reducing ship body roll on both sides of the ship body under the water surface, and a fin rotation drive lj! which rotationally drives the rotating wheel of the fin. The fins are mounted on a bed plate mounted inside the ship, and the bed plate is rotatably mounted on the ship's hull so that the fins can be rotated so that the wing tips of the fins are retracted during high-speed sailing. It is characterized by being provided with a base plate rotation drive mechanism that rotationally drives the base plate.

[For production]

In the above-mentioned hull WA sway reduction device of the present invention, the fins are rotated together with the plywood by the plywood rotation drive mechanism, so during low-speed cruising, the fins are arranged perpendicular to the hull centerline to sufficiently reduce the sway of the hull. In order to ensure a large fin area, during normal navigation at high and medium speeds, the wing tips of the fins are moved back to reduce the lead resistance of the fins.

〔Example〕

Hereinafter, a ship body roll reduction device as an embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is a plan view showing the state in which it is used during low-speed cruising, and Fig. 2 shows the retracted state of the fin wing tip. FIG. 3 is a plan view, and FIG. 3 is a perspective view showing the state in which the fin wing tip is attached to the ship's body, and FIG.

As shown in Fig. 3.4, fins 2 for suppressing hull rolling are provided on both sides of the hull S in a manner that projects laterally and are rotatable. In addition,
The fins 2 have a sufficient fin area to reduce rolling of the ship S during low-speed navigation.

As shown in Fig. 1.2, the fin 2 is connected to a fin rotation drive mechanism 3 via a rotating wheel 5, and is rotated by a required angle around the rotating wheel line. It has become.

On the other hand, the fin rotation drive mechanism 3 is mounted on a base plate 7 installed inside the ship, and the base plate 7 rotates a rotary wheel 8 relative to the hull S so that the wing tips of the fins 2 move backward. It is mounted so that it can rotate at the center.

A hydraulic cylinder 6 is connected to the base plate 7 as a base plate rotation drive mechanism in order to drive the base plate 7 around a rotary wheel 8 by a required angle.

In addition, an opening 1a for the drive shaft is formed in the hull outer plate 1 so as not to interfere with the fin 2 when the fin 2 is retracted, and there is a gap between the periphery of the opening 1a and the base plate 7. , bellows 9 are provided to maintain watertightness inside the ship. Further, as shown by the two-dot chain line in Fig. 1.2, the entire device may be surrounded by a watertight bulkhead inside the ship.

The symbol W in the figure indicates draft paddy.

Since the hull rolling reduction device of the present invention is configured as described above, during low-speed sailing, the fins 2 rise to the hydraulic cylinder 6 via the bed plate 7, as shown in FIG.
The rotating wheel 5 is arranged perpendicular to the hull center line, and in order to reduce the rolling of the hull S, the angle around the rotating wheel 5 is adjusted by the fin rotation drive 8! Properly adjusted by horizontal 3.

In this case, since the area of the fins 2 is sufficiently large, the shaking of the hull S is reliably reduced.

On the other hand, during normal navigation at high and medium speeds, as shown in Fig. 2.4, the hydraulic cylinder 6 rotates the base plate 7 around the rotary wheel 8, and the fin 2 is moved so that the wing tip of the fin 2 moves backward. By turning the ship, the hull resistance caused by the 74-inch can be reduced.

Note that even with the fins 2 retracted in this way, the flow velocity around the fins 2 is thick (,
Since the fins 2 generate a sufficiently large lift force, the rolling of the ship body S is sufficiently reduced.

〔Effect of the invention〕

As described in detail above, the ship body rolling reduction device of the present invention has the following features:
Under water, fins for suppressing hull sway are rotatably provided on both sides of the hull, and the rotating axis of the fins is rotated. is mounted on a white base installed inside the ship, and the base plate is rotatably attached to the ship's hull in order to rotate the fins so that the wing tips retreat during high-speed sailing. With a simple configuration that includes a base plate rotation drive mechanism that rotates the
The fins do not increase the hull resistance during normal sailing, and the swaying of the ship body is effectively reduced during low-speed sailing as well as during high-medium speed sailing.

[Brief explanation of drawings]

Figures 1 to 4 show a ship body rolling mitigation device as an embodiment of the present invention. Figure 1 is a plan view showing the state in which it is used during low-speed cruising, and Figure 2 is a receding of the fin wing tip. FIG. 3 is a plan view showing the condition, FIG. 3 is a perspective view showing the state of attachment to the ship body, and FIG. tjS4 is a perspective view showing the condition of attachment to the ship body when the fin wing tip is retreating. 1...Hull outer plate, 1a...Opening for drive shaft, 2...Fin for suppressing hull rolling, 3...Fin rotation drive B1 information, 5
・・Rotating Yuzu, 6・・Hydraulic silling as a base plate rotation drive mechanism, 7・・・Base plate, 8・・Rotating wheel, 9・・・Bellwell, S
...Hull, W...Waterline. Sub-Agent Patent Attorney Katonuma A 7a Figure 1

Claims (1)

[Claims] Under water, fins for suppressing hull roll are rotatably provided on both sides of the hull, and a fin rotation drive mechanism that rotates the rotating wheels of the fins is mounted on a base plate installed inside the boat, and is operated at high speed. The base plate is rotatably attached to the hull in order to rotate the fins so that the wing tips retreat during navigation, and a base plate rotation drive mechanism is provided to rotate the base plate. A ship roll reduction device.