JPS634720Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a dozier that can reduce the wind pressure resistance of a ship.

Traditionally, on ships, wind pressure resistance acting on structures above the water surface has been considered extremely small compared to fluid resistance acting below the water surface and has been ignored, but in recent years we have entered an era of energy conservation, and bridges with particularly large structures have been ignored. The wind pressure resistance of buildings has become more and more of a focus, and various means have been proposed to reduce the wind pressure resistance.

However, none of them had sufficient effects.

The purpose of the present invention is to solve such problems, and the dosier base end portions are attached to the vertical rotation shafts provided on both sides of the bridge tower, and by the rotation of the rotation shafts, the dosier installed on the bridge tower is rotated. It is a dozier that can be moved in and out between the hangar and the side, and when it is located in the dozier hangar, the windbreaker installed at the bottom of the dozier is flush with both sides of the bridge tower, making the bridge tower smooth. This object is achieved by providing a dosier constructed with a curved wall, which makes it possible to reduce the wind pressure resistance of a ship.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be explained in detail below based on the drawings showing one embodiment thereof. In this example, based on previous research and considering the following points, it was decided to reduce the wind pressure resistance of the bridge tower.

1 Normally, the bridge tower is often installed on the upper deck of the stern, and the wind characteristics in such a case are as shown in Figure 1, where a boundary layer 1 is formed due to the roughness of the upper deck, and the wind near the bridge tower is The wind distribution changes in the vertical direction, with the wind speed 2 being small near the upper deck, gradually increasing as you move upward, and becoming constant at a certain height.

2. Since wind pressure resistance is proportional to the square of wind speed, the bridge tower is constructed with a structure with a large cross-sectional area in the area of low wind speed, and a compact structure without corners with the pressure-receiving surface as small as possible near the top. I think this is the only way to reduce wind resistance.

Figures 2 to 5 show the bridge tower based on the above.

Reference numeral 3 denotes a bridge tower lower structure of a ship 4, and a bridge tower upper structure 5 smaller than the lower structure 3 is installed above it, and the front part and each corner of the planar shape each have large and small curvatures. It has a streamlined shape.
The reason why the bridge tower was formed from two large and small blocks was that the large bridge tower lower structure 3 was installed on the upper deck surface 6 where the wind pressure was relatively low, and the width direction was made smaller in the area above it where the wind pressure was high. By installing the small bridge tower superstructure 5, the cross-sectional shape in the height direction is changed from the box-shaped cross-sectional shape of the conventional bridge tower to a shape that is narrow at the top and widens at the bottom, reducing airflow turbulence and creating a smooth flow field. This is to form a Reference numeral 7 denotes dosiers according to the present invention, which are provided on both upper sides of the bridge tower superstructure 5, and are rotatable around one end thereof, and are provided on both side walls of the bridge tower superstructure 5 when in the folded state. It is located in the dozier hangar 8, and is configured to be movable in and out between the dozier hangar 8 and the ship's side so that the other end is located on the ship's side when it is in an extended state.

Reference numeral 9 denotes a steel frame structure windbreaker (windbreak wall) installed at the bottom of both dosiers 7, which hangs down to the vicinity of the upper surface of the bridge tower substructure 3, and rotates with the dosier 7. When it is located in the dozier hangar 8, it is flush with both sides of the bridge tower superstructure 5, and serves to form the superstructure 5 into a smooth curved wall. In addition, 10 is the engine room,
11 is a chimney, and 12 is a rear living pressure located on the bridge deck lower structure 3 and provided at the rear of the bridge deck upper structure 5 on the stern side.

FIG. 6 shows the attachment mechanism of the dosier 7. 1
Reference numeral 3 denotes a rotating shaft provided vertically at the bow side end of the dozier hangar 8. The base ends of the dozier 7 and windbreaker 9 are attached to the middle part, and the upper and lower ends are connected to the bridge tower superstructure 5. It is supported by a bearing stand 14 provided in the bridge deck lower structure 3, and a large gear 15 is attached to the lowermost end and is operatively connected to a drive device 17 via a transmission gear 16. The drive device 17 includes a rotating shaft 13
It has a built-in electric motor 18 that rotates the rotary shaft 13 and a breaker 19 that acts to brake the rotation of the rotary shaft 13, and is electrically connected to the dozier rotation control panel 20 in the cockpit so that it can be operated by remote control. It is configured.

FIG. 7 shows an enlarged view of part A in FIG. 6. In order to stably rotate the dozier 7 and the wind breaker 9 in good condition, a rotation shaft 13 is mounted on the upper surface of the bridge deck substructure 3. An arcuate guide rail 21 is provided, and a guide roller mechanism 22 is attached to a position corresponding to the guide rail 21 on the lower surface of the windbreaker 9. The guide roller mechanism 22 includes a support roller 23 that rolls along the upper surface of the guide rail 21, and a support roller 23 that rolls along the upper surface of the guide rail 21.
It has a pair of guide rollers 24 that roll along the back surface of one upper flange 21A.

Next, the movement of the dossier 7 in this configuration will be described.

If the dozier 7 is needed as a lookout when the ship 4 enters and leaves the sea, the dozier hangar 8 in the bridge tower superstructure 5 is used.
The dosier 7 stored in the dossier 7 is rotated and extended until the other end is located on the gunwale side. In such a case, the driver first operates the dozier rotation operation panel 20 in the cockpit to operate the electric motor 18 of the drive device 17. Electric motor 18
As the transmission gear 16 rotates, the rotating shaft 13 rotates via the large gear 15, whereby the dozier 7 and windbreaker 9 rotate and gradually extend out from the dozier hangar 8 to the side.
At this time, the rotation of the rotating shaft 13 is braked by the breaker 19 to perform stable rotation, and the dodger 7 and windbreaker 9 are rotated stably along the guide rail 21 by the guide roller mechanism 22. I do.
When the other end of the dosier 7 is positioned on the side, the extending work is completed.

Furthermore, even if a tailwind occurs during the voyage, by extending the dodger 7 and the windbreaker 9 as described above, the windbreaker 9 is given the wind pressure of the tailwind and serves to assist the thrust force. On the other hand, if there is a headwind, the reverse operation is performed to fold up the dosier 7 and windbreaker 9 and store them in the hangar 8, thereby reducing wind pressure resistance. In this case, the windbreaker 9 is installed in the hangar 8.
When entering the bridge tower superstructure 5, it becomes flush with both sides of the bridge tower superstructure 5, forming the superstructure 5 into a smooth curved wall, so that the airflow acting on the bridge tower superstructure 5 forms a smooth flow field, reducing wind pressure resistance. This will significantly reduce the According to this embodiment, since the windbreaker 9 is provided at the lower part of the dozier 7, the wind breaker 9 is 20 to 30 times stronger in headwinds than the conventional box-shaped bridge deck.
% reduction in drag (estimated), and a considerable improvement in thrust can be expected even in tailwinds.

As described above, according to the present invention, the windbreaker is installed between the Dozier hangar and the side of the Dozier bridge deck so that it can be freely moved in and out, and the windbreaker is provided at the bottom of the Dozier, so that it can cope with headwinds and tailwinds to the ship. By moving the dodger in and out as appropriate, it is possible to reduce the wind pressure resistance of the vessel against headwinds, and to use the wind pressure as thrust for the vessel against tailwinds.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram showing the wind characteristics on a ship.
Figures 2 to 7 show one embodiment of the present invention;
The figure is a front view of a ship equipped with a dozier according to the present invention with the dozier folded, FIG. 3 is a front view of the vessel of FIG. 2 with the dozier extended, and FIG. 4 is a plan view of FIG. 3. , FIG. 5 is a side view of FIG. 3, FIG. 6 is a schematic explanatory view showing the attachment mechanism of the dosier according to the present invention, and FIG. 7 is an enlarged view of the part A in FIG. 6. 3...Funbridge tower lower structure, 5...Funbridge tower upper structure, 7...Dozier, 8...Dozier hangar.

Claims (1)

[Scope of utility model registration request] A dozier base end is attached to each of the vertical rotating shafts provided on both sides of the bridge tower, and by rotation of the rotating shafts, the dozier can be freely moved in and out between the dozier hangar provided on the bridge tower and the side. A dozier characterized in that, when located in the dozier hangar, the windbreaker installed at the bottom of the dozier is flush with both sides of the bridge tower, forming the bridge tower as a smooth curved wall. .