JP5581371B2 - Ship - Google Patents

Description

  The present invention relates to a ship provided with an air lubrication device, and more particularly to a ship in which air jets are arranged over almost the entire width of the ship bottom.

  Most of the hull resistance received from water during navigation by ships, particularly large ships, is occupied by frictional resistance generated by the relative flow of outside water at the bottom of the ship. Therefore, air lubrication that blows air from the bottom of the ship to generate bubbles and flows the bubbles along the bottom of the ship has a great effect on reducing fuel consumption of the ship and suppressing emission of carbon dioxide.

  In order to effectively perform air lubrication, it is necessary to flow air bubbles over the entire bottom of the ship, and therefore the air outlets are arranged in series over the entire width of the bottom of the ship (for example, Patent Documents 1 and 2). In addition, the air outlet is formed in the ship bottom outer plate by opening each long space and covering the openings with a cover plate having a large number of small holes (for example, Patent Document 3).

JP 2010-120612 A JP 2011-213324 A JP 11-291974 A

  As described above, in a ship provided with an air lubrication device, it is necessary to open an opening over almost the entire width of the bottom shell plate. However, the ship bottom skin is a so-called longitudinal strength member, and a large tensile force acts on the ship bottom skin by vertical bending. When an opening is provided in such a member, stress concentration occurs around the opening. Further, when the openings are adjacent to each other, an excessive stress is generated due to the influence of stress by the adjacent opening. That is, when a large number of openings are arranged in the width direction on the ship bottom outer plate, there is a problem that the longitudinal bending strength is lowered.

  The present invention has been made under such circumstances, and enables effective air lubrication by arranging the air outlets in the width direction of the hull while minimizing the decrease in longitudinal bending strength. The aim is to provide a possible ship.

In order to achieve the above object, a ship according to the present invention has air lubrication jets arranged in a width direction in a double bottom in which a plurality of sections surrounded by a floor and a girder are arranged in a grid pattern. The section provided with the spout, which is adjacent to the hull width direction, is alternately shifted back and forth by one floor space in the hull length direction. It is characterized by.

  The plurality of jets may be arranged in the hull width direction in the section, and the jets adjacent in the hull width direction may be arranged to be shifted back and forth in the hull length direction.

  The spouts arranged in the hull width direction in the section may be alternately arranged back and forth in the hull length direction.

  The spouts arranged in the width direction of the hull in the section may be alternately arranged back and forth in the hull length direction at a pitch of at least twice the length of the spout.

  According to the present invention, when a section in a double bottom, surrounded by a floor and a girder and provided with an air outlet for air lubrication, is adjacently arranged in the width direction of the hull, the hull length In the vertical direction, the air jets are arranged so as to be shifted back and forth, so that it is possible to arrange the air outlets in the width direction of the hull while minimizing the decrease in the longitudinal bending strength.

It is a notional block diagram of a ship carrying an air lubrication device. It is a notional longitudinal cross-sectional view which shows the structure of the jet outlet of an air lubrication apparatus. It is explanatory drawing explaining arrangement | positioning of a jet nozzle.

  FIG. 1 is a conceptual configuration diagram of a ship 1 according to the present invention. As shown in FIG. 1, the ship 1 includes an air lubrication device 2. The air lubrication device 2 is a device that generates high-pressure air supplied from an air source 3 from a jet port 4 disposed at the bottom of a ship to generate bubbles, thereby reducing frictional resistance. In addition, there are a plurality of jet nozzles 4 and they are arranged so that the bottom of the ship 1 is covered with bubbles over the entire width. The air source 3 is a device that generates high-pressure air by boosting the atmosphere, and is, for example, a compressor or a blower. A supercharger of a main engine (not shown) of the ship 1 may be used as the air source 3 instead of a dedicated compressor or blower. That is, high-pressure air may be extracted from the supercharger and supplied to the air lubrication device 2.

  The jet nozzle 4 is generally configured as shown in FIG. That is, the spout 4 is formed in the double bottom, and includes a chamber 7 attached to the inside of the hull inside the opening 6 opened in the ship bottom skin 5 and a cover plate 8 covering the opening 6. The chamber 7 is supplied with high-pressure air from the air source 3 through the air supply tube 9, and the high-pressure air supplied to the chamber 7 is ejected to the outside through a small hole 10 formed in the cover plate 8 to generate bubbles.

  FIG. 3 shows a planar arrangement of the jet nozzles 4 and the structural members on the ship bottom skin 5 of the ship 1. As shown in FIG. 3, a longe 11 and a girder 12 are disposed on the ship bottom outer plate 5. Both the longe 11 and the girder 12 are structural members that run in the fore-and-aft direction, ie, longitudinal members. Are arranged in the width direction of the hull. Therefore, three longes 11 are arranged between the adjacent girders 12. Reference numeral 13 denotes a center girder disposed on the center of the hull, and the right side in FIG. 3 is the direction toward the bow, that is, FIG. 3 shows the port side half of the bottom shell outer plate 5. Longi 11 is a comparatively small longitudinal member made of angle steel or the like, and girder 12 and center girder 13 are large longitudinal passages having a depth reaching the inner bottom plate (not shown) from ship bottom outer plate 5. It is a material.

  Further, floors 14 are arranged at intervals of 3 frame spaces (FS) in the bow-stern direction. The floor 14 is a lateral strength member that extends in the width direction of the hull, and has a depth that reaches the inner bottom plate (not shown) from the outer bottom plate 5.

  As described above, the double bottom of the ship 1 is divided into a lattice pattern by the girder 12 or the center girder 13 and the floor 14. Hereinafter, in this specification, a rectangular area surrounded by a pair of adjacent girder 12 or center girder 13 and a pair of adjacent floors 14 will be referred to as a “partition”.

  Now, the sections in the double bottom where the jet nozzle 4 is arranged will be described with reference numerals A to C as shown in FIG. As is clear from FIG. 3, the section A is the innermost section (near the center line) of the port side. The section B is a section adjacent to the section A in the hull width direction, and is closer to the stern by one floor space than the section A in the hull length direction. The section C is adjacent to the section B in the hull width direction, and is closer to the bow than the section B by one floor space in the hull length direction, that is, at the same position as the section A.

  As described above, the sections A to C are arranged adjacent to each other in the hull width direction, and the adjacent sections are arranged back and forth by one floor space in the hull length direction. That is, the jetting outlet 4 is arranged, and the sections adjacent in the hull width direction are arranged shifted in the hull length direction. Further, a section adjacent to a section adjacent to a section is disposed at the same position as the section in the hull length direction. That is, the sections in which the jet nozzles 4 are arranged and are arranged in the hull width direction are alternately arranged back and forth in the hull length direction.

  Further, in each of the sections A to C, for example, in the section A, the jet outlets 4 are arranged between the adjacent longages 11, and the adjacent jet outlets 4 in the hull width direction alternately move back and forth in the hull length direction. Are arranged. Moreover, the jet nozzle 4 exists in the range of about 1 frame space, and the jet nozzle 4 adjacent in the hull width direction is arrange | positioned back and forth by 2 frame spaces. In other words, the jet outlets 4 are alternately arranged back and forth in the hull length direction at a pitch of at least twice the length of the jet outlets 4.

  Thus, since the ship 1 arrange | positions the division which has arrange | positioned the spout 4 back and forth in the hull length direction, and has arranged in the hull width direction, since all the spouts 4 do not line up in the hull width direction. The fall of the longitudinal bending strength of the ship bottom outer plate 5 can be suppressed. Even if the ship bottom skin 5 around the spout 4 is deformed, the displacement is limited by the girder 12 and the floor 14 arranged at the boundary of the section. It is hard to reach division. Therefore, the fall of the longitudinal bending strength of the ship bottom outer plate 5 is further suppressed. Moreover, since the adjacent jet nozzles 4 are arranged so as to be shifted back and forth in the compartment, the stress concentration can be reduced also in the compartment. Therefore, the fall of the longitudinal bending strength of the ship bottom outer plate 5 is further suppressed.

  As described above, according to the present invention, it is possible to arrange the air outlets in the width direction of the hull while minimizing the decrease in the longitudinal bending strength, thereby realizing a ship capable of effective air lubrication. it can. As a result, it is possible to contribute to the reduction of operation expenses, energy saving, and the preservation of the global environment.

  In addition, the said embodiment is an illustration of this invention, Comprising: The technical scope of this invention is not limited by the said embodiment. The present invention can be freely applied, modified or improved as long as it is within the technical idea shown in the claims.

  For example, in the above-described embodiment, an example in which the section is moved back and forth in the range of 2 floor spaces is shown, but the section may be moved back and forth in the range of 3 floor spaces, for example. Moreover, in the said embodiment, since the ship 1 which employ | adopted what was called a combined system was illustrated, although it demonstrated that 3 frame space was equivalent to 1 floor space, the application object of this invention is the ship which employ | adopted the combined system. Is not limited. The present invention can also be applied to a ship that employs a long system, that is, a ship that does not have a horizontal frame, or a ship that cannot conceive a frame space.

DESCRIPTION OF SYMBOLS 1 Ship 2 Air lubrication apparatus 3 Air source 4 Jet outlet 5 Ship bottom outer plate 6 Opening 7 Chamber 8 Cover plate 9 Air supply pipe 10 Small hole 11 Longi 12 Girder 13 Center girder 14 Floor AC division

Claims (4)

In a ship provided with a plurality of sections surrounded by a floor and girder arranged in a double bottom in which a plurality of sections arranged in a grid pattern are arranged in the width direction of the hull for air lubrication.
A vessel provided with the above-mentioned jet nozzles, and the zones arranged adjacent in the hull width direction are alternately shifted back and forth by one floor space in the hull length direction. . The plurality of jets are arranged in the width direction of the hull in the section, and the jets adjacent in the width direction of the hull are arranged to be shifted back and forth in the length direction of the hull. The ship according to 1 . The ship according to claim 2 , wherein the jet nozzles arranged in the hull width direction in the section are alternately arranged back and forth in the hull length direction. The jets arranged in the width direction of the hull in the section are arranged at a pitch of at least twice the length of the jets and are alternately arranged back and forth in the length direction of the hull. The ship according to claim 2 .

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