JPS6194893A - Device for reducing rolling of hull - Google Patents

Abstract

PURPOSE:To provide the sufficient effect of reducing rolling in low speed by providing a fin of a fin stabilizer having to upper and lower stages without elongating the blade length of the fin. CONSTITUTION:A hull rolling reducing fin 4 disposed to project sidewise of the shell 1 of the hull under the water is pivoted about a projecting axis 2 to reduce rolling. The projecting shaft 2 is provided on the end with a fin supporting portion 3 on which are juxtaposed two fins 4 for reducing the rolling of hull. The area of fin on which the lift is produced can be provided sufficiently wide so that the rolling of hull in low speed sail can be reduced without elongating the blade length of fin.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is directed to the construction of the hull of a ship during navigation. This invention relates to a device for reducing shaking.

[Conventional technology]

As a device for reducing the roll of the ship when the ship is in motion, fins for suppressing the roll of the ship are installed on both sides of the ship (vh).
Fin stabilizers have been used for a long time, and utilize the lift force generated on the fins by the flow of outside water along the fins as the ship sails, to prevent the ship from rolling. efforts are being made to reduce the

[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, and the problem is that the ship roll cannot be sufficiently reduced. There is.

However, marine research vessels and the like often travel at low speeds during observation operations, 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 cruising, it may be possible to increase the fin area by increasing the chord length of the fins or by increasing the blade length of the fins.

However, if the chord length of the fin is increased, the aspect ratio becomes smaller and the performance of the fin becomes lower.
The fin 4's side protrudes laterally beyond the fin gAhB, which not only interferes with the quay when berthed and hinders ship maneuvering, but also causes problems with the strength of the fin 4'' itself. .

In view of the above-mentioned points, the present invention is designed to sufficiently reduce the rolling motion of a ship not only when the ship is traveling at high speeds but also when traveling at low speeds without increasing the chord length or wing length of the fin. The purpose of the present invention is to provide a ship body roll reduction device that provides a ship body rolling reduction device.

Means for Solving Problem c] For this reason, the ship body rolling reduction device of the present invention has a rotational drive mechanism provided inside the ship and a fin support circuit that is rotationally driven by the rotational drive mechanism in each side of the ship. (It is characterized by having a fin supporting part provided at the tip of the rotating shaft, and a plurality of fins for suppressing hull rolling supported by the fin supporting part being arranged side by side in the open water. There is.

[Effect]

In the above-mentioned ship roll mitigation device of the present invention, since the plurality of hull roll suppression fins are rotatably arranged in parallel, the total area of the fins can be increased without increasing the fin length or blade length. (Thus, even during low-speed cruising, the fins provide sufficient lift, and the rolling of the ship is reliably reduced.

〔Example〕

Hereinafter, embodiments of the present invention will be explained with reference to the drawings.
Figures 1 and 2 show hull rolling reduction 1ffi as the first embodiment of the present invention. Figure 1 is a llIwR side view of a ship equipped with this device, and Figure 2 is a perspective view of the same ship. can be,
Figures 3 to 5 show a ship body roll reduction device as a second embodiment of the present invention, with Figure 3 being a front view showing its use during low-speed cruising, and Figure 4 showing its use during high-speed cruising. A front view showing the state, and FIG. 5 is a sectional view taken along the line ■-■ in FIG. 3.

In the first embodiment of the present invention, as shown in FIG. 1.2, a rotational drive mechanism (not shown) is provided inside the ship in each side gA section of the hull S, and fins are rotationally driven by the rotational drive mechanism. A support rotating shaft 2 is provided to protrude from the hull outer plate 1 into the water outside the boat.

A fin support part 3 is provided at the tip of this fin support rotating shaft 2, and two fins 4 for suppressing hull rolling are arranged in parallel on the fin support part 3.

Note that although two fins 4 are used in this embodiment, three fins 4 are used.
More than one fin 4 may be arranged in parallel.

Further, the symbol W in the figure indicates a waterline.

The first transportation embodiment of the present invention is configured as described above, so that the plurality of fins 4 provided on the port and starboard sides are rotated (not shown) through the fin support portion 3 and the fin support rotation shaft 2. It is rotationally driven by a drive mechanism, and the lifting force generated by the fins 4 is used to suppress the rolling of the hull S.

In this case, in this embodiment, there are two fins 4 on the port and starboard sides.
The area of the fins 4 that generate lift is sufficiently large, so even when sailing at low speed, the hull
lateral vibration is definitely reduced.

In addition, the fin 4 can be
Since the area is secured, there will be no inconvenience as in the conventional case.

Next, in the second embodiment of the present invention, as shown in FIGS. A rotating shaft 2' for supporting the fin is provided.

The tip end 2'a of this fin support rotating shaft 2' is shaped like a T character, and a rod member 6 is attached to the tip end 2'a.
, 718. Stopper 9.10. A fin support portion 3' constituted by a hydraulic cylinder 11 and a hinge 12 is provided. In other words, as shown in PIS figures 3 to 5,
The bases j1 of the pair of n members 7.7 are attached to the rotating shaft 2' so that they can slide along the sleeves 2'b formed at the tips W2'a of the rotating shaft 2' by means of stoppers 9 and 10, respectively.
’ is installed.

Further, a hydraulic sill 11 is fixed to the rotary shaft 2'' so as to be able to rotate together with the rotary shaft 2'. A rod member 8 disposed between the rod members 7, 7
is designed to be expanded and contracted.

Further, at the tip of the ff1 part shrine 8, a pair of Azusaberi 6, 6 is pivoted at one end by a hinge 12, and these rod members 6
．． The bottom ends of 6 are pivoted by hinges 12 to rod members 7, 7, respectively.

Fins 4', 4' are fixedly attached to the tip of the rod member 7.7, respectively.

When the rod member 8 is pushed out by the hydraulic cylinder 11 using the fin support portion 3' as described above, the rod member 4' is spaced apart as shown in Fig. 3, tp and rr! On the other hand, when the rod member 8 is pulled in with the hydraulic sill 11, it is arranged in an integrated state as shown in FIG.

Note that a water sealing means (not shown) is applied to the periphery of the opening 1a formed in the hull outer plate 1 and through which the fin support portion 3' passes, to maintain watertightness inside the boat.

The second embodiment of the present invention is constructed as described above, so that when cruising at low speed, the rod member 8 is extended by the hydraulic cylinder 11 as shown in FIG.
The same effects as in the fIS1 embodiment can be obtained by keeping the fins separated from each other and rotating the eaves drive mechanism 5 through the fin support part 3' and the fin support rotating shaft 2'. .

On the other hand, increasing the ship speed and lifting force from one fin can cause the ship's S
When it becomes possible to sufficiently reduce the rolling of the rod member 8, the rod member 8 is retracted by the hydraulic cylinder 11, and the fins 4' are combined into one body as shown in FIG. , 4' are adjusted to reduce the rolling of the hull S.

In this case, the areas of the fins 4', 4' are smaller than when the vessel is sailing at low speed, so that an increase in hull resistance, which becomes a problem when sailing at high speed, can be minimized.

〔Effect of the invention〕

As described in detail above, according to the ship body roll reduction device of the present invention, each side of the ship has a rotary drive mechanism that is not provided inside the ship, and a rotary drive mechanism that is mounted on the same side. It is equipped with a rotating shaft for supporting fins that is driven by the fi structure, and a fin support part is provided at the tip of the same plane (transfer).
.

It has a simple structure in which a plurality of hull roll suppression fins supported by a support part are installed in the open water, and the ship's m This has the effect of reducing shaking.

[BRIEF DESCRIPTION OF THE DRAWINGS] Figures 1 and 2 show a ship body rolling reduction device as an embodiment of the tjS1 of the present invention. Figure 1 is a cross-sectional view of a ship equipped with this device, and Figure fjS2 is a cross-sectional view of a ship equipped with this device. is a perspective view of the third
Figures 5 to 5 show a ship body roll reduction device as a second embodiment of the present invention, Figure 3 is a front view showing the state in which it is used during low-speed sailing, and Figure 4 shows the state in which it is used during high-speed sailing. Figure 165 is a cross-sectional view taken along the line ■--■ in Figure 3, and the sixth view is a cross-sectional view 1 showing a ship equipped with a conventional hull roll reduction device. ]...Hull outer plate, 1a...Opening, 2.2゛...Rotating axis for fin support, 2°a...9M of rotating shaft for fin support
part, 2°b...Slit, 3.3'...Fin support part, 4.4'...Fin for suppressing hull rolling, 5...Rotary furnace chih mechanism, LL8...Bar member, 9°10 ...Stopper, 11..Hydraulic sill, 12..Hino, Do..Hull, W..Waterline. Sub-Agent Patent Attorney Yoshihiko Iinuma Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] In each ship side part, a rotational drive mechanism provided inside the ship,
A fin support rotary shaft is rotatably driven by the rotary drive mechanism, a fin support part is provided at the tip of the rotary shaft, and a plurality of hull roll suppression fins supported by the fin support part are provided. A ship body rolling reduction device characterized by being installed side by side in open water.