Ship

Abstract

A ship includes a hull and a gas supply device that supplies gas to the bottom of the hull. The ship bottom is provided with a plurality of recesses to which the gas is supplied. The plurality of recesses are spaced apart from each other in the width direction. The plurality of recesses each extend in a front-back direction.

Description

Technical Field

[0001] This disclosure claims priority to Japanese Patent Application No. 2024-002765, filed on January 1, 2024, the entire content of which is incorporated herein by reference.

[0002] The present invention relates to a ship. Background Art

[0003] Patent Document 1 (JP2010-120607A) proposes a friction reduction device that reduces the friction between the hull of a ship and water. The friction reduction device of Patent Document 1 ejects gas from a group of air injection holes provided on the bottom of the ship. By forming a bubble film on the bottom of the ship with the ejected gas, the friction between the hull and water can be reduced. By reducing friction, fuel efficiency can be improved, achieving the purpose of reducing the environmental load.

[0004] The ship disclosed in Patent Document 1 designed the formation position of the group of air injection holes for the purpose of ejecting gas over a relatively wide range on the bottom of the ship. However, the bottom of the ship was not designed. Therefore, the ejected gas quickly floats to the water surface from the bottom of the ship, and friction cannot be effectively reduced. Summary of the Invention

[0005] The present invention has been made in consideration of the above points, and an object thereof is to provide a ship capable of effectively reducing the friction between the hull and water.

[0006] The first ship of the present technical solution includes a hull and a gas supply device,

[0007] The gas supply device supplies gas to the bottom of the hull,

[0008] The bottom of the ship is provided with a plurality of depressions to which the gas is supplied,

[0009] The plurality of depressions are spaced apart from each other in the width direction,

[0010] Each of the plurality of depressions extends in the front-rear direction.

[0011] The first ship of the present technical solution includes a hull and a gas supply device,

[0012] The gas supply device supplies gas to the bottom of the hull,

[0013] The bottom of the ship is provided with a plurality of depressions to which the gas is supplied,

[0014] The plurality of depressions are spaced apart from each other in the width direction,

[0015] Each of the plurality of depressions extends in the front-rear direction,

[0016] The gas supply device includes a gas supply source and a gas supply cylinder portion. The gas supply source supplies the gas, and the gas supply cylinder portion supplies the gas supplied by the gas supply source to the recess.

[0017] The gas supply cylinder portion includes a jet end portion that opens to the rear side in the front-rear direction.

[0018] The recess opens to the front in the front-rear direction.

[0019] The gas supply cylinder portion extends forward from the hull.

[0020] The gas supply cylinder portion extending to the outside of the hull is inserted into the recess through the opening in front of the recess in the front-rear direction.

[0021] The jet end portion is located within the recess.

[0022] According to the present invention, the friction between the hull and water can be effectively reduced. Description of the Drawings

[0023] Figure 1 It is a perspective view showing an example of a ship for explaining an embodiment.

[0024] Figure 2 It is shown from the front side in the front-rear direction Figure 1 The front view of the ship shown.

[0025] Figure 3 It is shown from the outside in the width direction Figure 1 The side view of the ship shown.

[0026] Figure 4 It is shown from the lower side in the up-down direction Figure 1 The bottom view of the ship shown.

[0027] Figure 5 It is for Figure 1 A cross-sectional view of a vertical section that magnifies and shows a recess included in the hull shown, perpendicular to the front-rear direction.

[0028] Figure 6 It is for Figure 3 The corresponding figure for explaining a modification example of the gas supply device.

[0029] Figure 7 It is for Figure 4 The corresponding figure for explaining a modification example of the recess and the gas supply cylinder portion.

[0030] Figure 8 It is for Figure 5 The corresponding figure for explaining other modification examples of the recess and the gas supply cylinder portion.

[0031] Figure 9 For Figure 5 the corresponding figure, which is used to illustrate another alternative deformation example of the recess.

[0032] Figure 10 For Figure 5 the corresponding figure, which is used to illustrate another alternative deformation example of the recess. Detailed implementation manners

[0033] One implementation manner of the present disclosure relates to the following <1> to <13>.

[0034] <1>

[0035] A ship, comprising a hull and a gas supply device,

[0036] The gas supply device supplies gas to the bottom of the hull,

[0037] The bottom of the hull is provided with a plurality of recesses to which the gas is supplied,

[0038] The plurality of recesses are spaced apart from each other in the width direction,

[0039] The plurality of recesses each extend in the front-rear direction.

[0040] <2>

[0041] A ship, comprising a hull and a gas supply device,

[0042] The gas supply device supplies gas to the bottom of the hull,

[0043] The bottom of the hull is provided with a plurality of recesses to which the gas is supplied,

[0044] The plurality of recesses are spaced apart from each other in the width direction,

[0045] The plurality of recesses each extend in the front-rear direction,

[0046] The gas supply device includes a gas supply source and a gas supply cylinder part,

[0047] The gas supply source supplies the gas, and the gas supply cylinder part supplies the gas supplied by the gas supply source to the recesses,

[0048] The gas supply cylinder part includes a jet end portion that opens to the rear side in the front-rear direction,

[0049] The recess opens to the front in the front-rear direction,

[0050] The gas supply cylinder part projects forward from the hull,

[0051] The gas supply cylinder part extending to the outside of the hull is inserted into the recess from an opening in front of the recess in the front-rear direction,

[0052] The ejection end part is located within the recess.

[0053] <3>

[0054] The ship according to <1> or <2>, wherein a part of the plurality of recesses is provided on one side in the width direction of the ship bottom,

[0055] The remaining part of the plurality of recesses is provided on the other side in the width direction of the ship bottom.

[0056] <4>

[0057] The ship according to any one of <1> to <3>, wherein the gas supply device includes a gas supply source and a gas supply cylinder part, the gas supply source supplies the gas, and the gas supply cylinder part supplies the gas supplied by the gas supply source to the recess.

[0058] The gas supply cylinder part extends from the hull to the outside of the ship.

[0059] <5>

[0060] The ship according to <4>, wherein the gas supply cylinder part includes an ejection end part that opens to the rear side in the front-rear direction.

[0061] <6>

[0062] The ship according to any one of <1> to <5>, wherein the gas supply device includes a gas supply source and a gas supply cylinder part, the gas supply source supplies the gas, and the gas supply cylinder part supplies the gas supplied by the gas supply source to the recess.

[0063] The gas supply cylinder part includes an ejection end part that opens to the rear side in the front-rear direction.

[0064] <7>

[0065] The ship according to any one of <1> to <6>, wherein the gas supply device includes a gas supply source and a gas supply cylinder part, the gas supply source supplies the gas, and the gas supply cylinder part supplies the gas supplied by the gas supply source to the recess.

[0066] The gas supply cylinder part includes a plurality of branch cylinder parts,

[0067] Each of the plurality of branch cylinder parts supplies the gas to other recesses included in the plurality of recesses.

[0068] <8>

[0069] The ship according to any one of <1> to <7>, wherein the plurality of recesses are symmetrically arranged with respect to a plane passing through the center in the width direction and extending in the vertical direction.

[0070] <9>

[0071] The ship according to any one of <1> to <8>, wherein the hull includes a propeller,

[0072] The propeller is not located on the extension line of each of the plurality of recesses.

[0073] <10>

[0074] The ship according to any one of <1> to <9>, wherein one or more of the plurality of recesses are bent outward in the width direction on the rear side in the front-rear direction.

[0075] <11>

[0076] The ship according to any one of <1> to <10>, wherein one or more of the plurality of recesses are bent upward in the vertical direction on the rear side in the front-rear direction.

[0077] <12>

[0078] The ship according to any one of <1> to <11>, wherein the bottom of the ship includes a low-inclination portion having an angle of 30° or less with respect to the width direction in a cross-section perpendicular to the front-rear direction,

[0079] One or more of the plurality of recesses are provided in the low-inclination portion of the bottom of the ship.

[0080] <13>

[0081] The ship according to any one of <1> to <12>, wherein one or more of the plurality of recesses do not include sharp-angled or right-angled corner portions in a cross-section perpendicular to the front-rear direction.

[0082] An embodiment of the present disclosure will be described below with reference to the accompanying drawings. In the accompanying drawings attached to this specification, for ease of understanding, the scale of the actual object and the vertical and horizontal dimensional ratios are appropriately changed and exaggerated. Structures shown in some of the drawings may be omitted in other drawings. The scale and vertical and horizontal dimensional ratios between the drawings may also be different.

[0083] In this specification, shapes, geometric conditions, and their degrees are specified. For example, for terms such as "vertical" or numerical values of lengths and angles, they are not limited to strict meanings and are interpreted to include ranges of degrees that can be expected to have the same function.

[0084] To clarify the directional relationships between the drawings, in some of the drawings, arrows with common reference numerals are used to indicate the common front-rear direction D1, width direction D2, and up-down direction D3. The tip side of the arrow is the first side of each direction. The side opposite to the tip of the arrow is the second side of each direction. For example, as Figure 2 shown, an arrow pointing from the paper surface towards the front in a direction perpendicular to the drawing paper surface is represented by a symbol with a dot set in a circle. For example, as Figure 4 shown, an arrow pointing from the paper surface towards the inside in a direction perpendicular to the drawing paper surface is represented by a symbol with an '×' set in a circle.

[0085] Figures 1 to 10 This is a drawing for explaining one embodiment. Figure 1 This is a perspective view schematically showing a specific example of the ship 10. Figure 2 This is a drawing showing the ship 10 from the front side in the front-rear direction D1 Figure 1 as shown. Figure 3 This is a drawing showing the ship 10 from the outer side in the width direction D2 Figure 1 as shown. Figure 4 This is a drawing showing the ship 10 from the lower side in the up-down direction D3 Figure 1 as shown.

[0086] In this specification, for the terms "front", "rear", "up", "down", "front-rear direction", "width direction", and "up-down direction" of the ship 10 and its components, unless otherwise specified, they refer to "front", "rear", "up", "down", "front-rear direction", "width direction", and "up-down direction" based on the attitude of floating on water. The "front-rear direction" refers to the forward direction when the ship is moving straight. "Front" refers to the "front" when the ship is moving straight. The "up-down direction" is the vertical direction of the ship 10 floating on water. The "width direction" is the direction perpendicular to both the "front-rear direction" and the "up-down direction".

[0087] As Figures 1 to 4 shown, the ship 10 includes a hull 20 and a gas supply device 40. The hull 20 is made of wood or metal. The hull 20 can generate buoyancy to float on water. The water on which the ship 10 floats can be seawater. The water on which the ship 10 floats can also be fresh water. Figure 3 Both the ship 10 and the water surface WL are shown in

[0088] The hull 20 can also be configured to be the same as a known ship. As Figure 3 and Figure 4As shown, the hull 20 may include a main body 21, a rudder 22, and a propeller 23 held on the main body 21. The hull 20 is not particularly limited. The hull 20 may be a small ship, a medium-sized ship, or a large ship. The hull 20 may be a merchant ship such as a fishing boat, a passenger ship, or a cargo ship, or it may be a work ship, or it may be a ship such as an aircraft carrier or an Aegis ship.

[0089] As Figures 1 to 4 shown, the hull 20 includes a bottom 25. The bottom 25 is the part located in the water when the ship 10 is floating on the water. As Figures 1 to 5 shown, a plurality of recesses 30 are provided at the bottom 25. The recesses 30 are parts where the outer surface of the bottom 25 is recessed. That is, the recesses 30 are concave portions provided on the outer surface of the bottom 25. Figure 5 Taking Figure 1 a magnification of one of the recesses 30 of the hull 20 shown, it is shown from the rear side in the front-rear direction D1.

[0090] The gas supply device 40 supplies gas to the bottom 25 of the hull 20. The gas supply device 40 supplies gas into the recesses 30. The gas supply device 40 may supply gas to the front side region of the recesses 30 located on the front side in the front-rear direction D1. The gas may be air. The gas may also be one or more of nitrogen, oxygen, and carbon dioxide.

[0091] As Figure 3 shown, the gas supply device 40 may include a gas supply source 45 and a gas supply cylinder portion 50. In the example shown in the figure, the gas supply source 45 supplies gas. The gas supply cylinder portion 50 forms a gas flow path. As Figure 3 shown, the gas supply source 45 is connected to the gas supply cylinder portion 50. The gas supply source 45 supplies gas to the gas supply cylinder portion 50. The gas supply cylinder portion 50 discharges the gas supplied by the gas supply source 45 into the recesses 30.

[0092] The gas supply source 45 may be a known device capable of supplying gas. The gas supply source 45 may be a blower that blows out gas. The gas supply source 45 may include an electric motor and a blower. The gas supply source 45 may include an electric motor and a compressor. The blower and the compressor are driven by the electric motor to suck in gas and eject the sucked-in gas.

[0093] As Figure 2 shown, the gas supply source 45 may be disposed on the front side in the front-rear direction D1 within the main body 21 of the hull 20. By shortening the distance in the front-rear direction D1 from the gas supply source 45 to the front side region of the recesses 30, the pressure loss within the gas supply cylinder portion 50 can be reduced.

[0094] The gas supply cylinder part 50 can be constituted by a pipe 52 made of metal or resin. The gas supply cylinder part 50 guides the gas from the gas supply source 45 to the recess 30. The gas supply cylinder part 50 can discharge gas to the front side area of the recess 30 located on the front side in the front-rear direction D1. According to this example, the gas movement distance in the recess 30 becomes longer, and the gas can remain in the recess 30 for a long time. That is, the gas in the recess 30 can be effectively utilized.

[0095] As Figures 3 to 5 shown, the gas supply cylinder part 50 includes a discharge end part 51. The discharge end part 51 is the most downstream part of the gas flow path in the gas supply cylinder part 50. The gas supplied from the gas supply source 45 to the gas supply cylinder part 50 is discharged from the discharge end part 51 to the recess 30.

[0096] As Figure 3 and Figure 4 shown, the discharge end part 51 can be located within the recess 30. Thereby, gas can be stably supplied from the gas supply device 40 into the recess 30, and the gas can be used more effectively.

[0097] As Figures 3 to 5 shown, the discharge end part 51 of the gas supply cylinder part 50 can be opened toward the rear side in the front-rear direction D1. The discharge end part 51 can be opened in the direction of the outer surface of the ship bottom 25 along the area where the discharge end part 51 is provided. That is, the discharge end part 51 can discharge gas in the direction of the outer surface of the ship bottom 25 along the area where the discharge end part 51 is provided. When viewed from the width direction D2, the discharge end part 51 can be opened in the direction in which the recess 30 extends in the area of the recess 30 to which gas should be supplied. When viewed from the width direction D2, the discharge end part 51 can discharge gas in the direction in which the recess 30 extends in the area of the recess 30 to which gas should be supplied. According to these structures, it is possible to prevent the gas supplied by the gas supply device 40 to the recess 30 of the ship bottom 25 from immediately floating to the water surface. That is, the gas in the recess 30 can be utilized more effectively.

[0098] As Figure 3 shown, the gas supply cylinder part 50 can protrude from the inside of the hull 20 to the outside of the ship. Figure 3 In the illustrated example, the recess 30 is opened on the front side in the front-rear direction D1. The discharge end part 51 of the recess 30 is inserted into the recess 30 through the opening on the front side in the front-rear direction D1.

[0099] Figures 1 to 3 In the illustrated example, the gas supply cylinder part 50 protrudes forward from the hull 20 in the front-rear direction D1. That is, the gas supply cylinder part 50 protrudes from the inside of the hull 20 to the outside and forward in the front-rear direction D1. Further, the gas supply cylinder part 50 includes a part that protrudes from the inside of the hull 20 to the outside through the opening part 27 of the hull 20 and is located further forward than the opening part 27 in the front-rear direction D1.

[0100] Figures 1 to 3 In the illustrated example, the gas supply cylinder part 50 extending outward from the hull 20 is inserted into the recess 30 through the opening 31 of the recess 30 located in front of the front-rear direction D1. The gas supply cylinder part 50 includes a first part 61 extending forward in the front-rear direction D1, a second part 62 turning back in the front-rear direction D1, and a third part 63 extending rearward in the front-rear direction D1 as the parts exposed to the outside of the hull 20. The gas supply cylinder part 50 extends outward from the hull 20 in the first part 61. The gas supply cylinder part 50 is inserted into the recess 30 in the third part 63. The first part 61 passes through the opening 27 of the hull 20. The third part 63 passes through the opening 31 of the recess 30. The opening 31 forms the front end of the recess 30 in the front-rear direction D1. The opening 31 opens into the recess 30 in the front direction of the front-rear direction D1.

[0101] The gas supply cylinder part 50 extends forward from the hull 20, and the gas supply cylinder part 50 extending outward from the hull 20 is inserted into the recess 30 through the opening 31 in front of the recess 30 in the front-rear direction D1. According to this structure, it is possible to ensure a longer length of the recess 30 and effectively utilize the gas inside the groove 30 throughout the entire length. The entire length of the recess 30 can be effectively utilized, and the friction between the hull 20 and the water can be effectively reduced.

[0102] The gas supply cylinder part 50 passes through the opening 31 of the recess 30 from the front to the rear in the front-rear direction D1, and the ejection end 51 is located inside the recess 30. Thereby, it promotes the gas ejected from the ejection end 51 to advance inside the recess 30 along the front-rear direction D1 from the bottom of the ship, and the outflow of the gas from the recess 30 can be suppressed.

[0103] Especially in Figure 3 the illustrated example, the gas supply cylinder part 50 extends along the front-rear direction D1 while passing through the opening 31. Therefore, it more effectively promotes the gas ejected from the ejection end 51 to advance inside the recess 30 along the front-rear direction D1 from the bottom of the ship, and more effectively suppresses the outflow of the gas from the recess 30.

[0104] As Figures 1 to 4 shown, the gas supply device 40 may include a plurality of gas supply cylinder parts 50. The plurality of gas supply cylinder parts 50 may be symmetrically arranged with respect to the center upper and lower surfaces CP that pass through the center D2C of the width direction D2 and extend in the up-down direction D3. The arrangement positions of the gas supply cylinder parts 50 provided on one side of the width direction D2 and the arrangement positions of the gas supply cylinder parts 50 provided on the other side of the width direction D2 may have a plane symmetry relationship with respect to the center upper and lower surfaces CP. By symmetrically arranging the plurality of gas supply cylinder parts 50, the straight-running performance of the ship 10 can be improved.

[0105] As Figures 1 to 4As shown, the gas supply cylinder part 50 may include a plurality of parts (such as the pipe 55) exposed from the hull 20. The plurality of parts (such as the pipe 55) of the gas supply cylinder part 50 exposed from the hull 20 may be symmetrically arranged centered on the central upper and lower surfaces CP that pass through the center D2C of the width direction D2 and extend in the vertical direction D3. The arrangement positions of the parts of the gas supply cylinder part 50 exposed from the hull 20 provided on one side of the width direction D2 and the arrangement positions of the parts of the gas supply cylinder part 50 exposed from the hull 20 provided on the other side of the width direction D2 may have a plane symmetry relationship centered on the central upper and lower surfaces CP. By symmetrically arranging the plurality of parts of the gas supply cylinder part 50 exposed from the hull 20, the straight running performance of the ship 10 can be improved.

[0106] The gas supply device 40 can supply gas as fine bubbles into the water. The gas supplied as fine bubbles is likely to form a bubble film on the bottom of the ship 25. The bubble film can more effectively reduce the friction between the bottom of the ship 25 and the water.

[0107] Figure 5 In the illustrated example, the gas supply cylinder part 50 includes a pipe 52 and an adjustment plate 53. A plurality of holes 53a are formed in the adjustment plate 53. The holes 53a function as the opening parts of the ejection end part 51. Gas is ejected from the holes 53a, so that the gas is more likely to become tiny bubbles in the recess 30.

[0108] The adjustment plate 53 is provided at the end of the pipe 52 that is the ejection end part 51. The adjustment plate 53 can be installed on the pipe 52 as a component other than the pipe 52. The adjustment plate 53 can also be integrally formed with the pipe 52.

[0109] The gas supply cylinder part 50 may include a plurality of branch cylinder parts 55. The branch cylinder parts 55 may be constituted by pipes 52. Each of the plurality of branch cylinder parts 55 may include an ejection end part 51 that opens to the rear side in the front-rear direction D1. That is, each branch cylinder part 55 may include an ejection end part 51 that opens to the rear side in the front-rear direction D1.

[0110] Two or more of the branch cylinder parts 55 included in the plurality of branch cylinder parts 55 may be individually provided in the entire section along the gas flow path. That is, two or more of the branch cylinder parts 55 included in the plurality of branch cylinder parts 55 may not merge in the entire section along the gas flow path.

[0111] Two or more of the branch cylinder parts 55 included in the plurality of branch cylinder parts 55 may merge in one section along the gas flow path. Two or more of the branch cylinder parts 55 included in the plurality of branch cylinder parts 55 may also merge on the upstream side along the gas flow path. Figures 1 to 4 In the illustrated example, the gas supply cylinder part 50 includes two branch cylinder parts 55. The two branch cylinder parts 55 may merge and be connected to the gas supply source 45.

[0112] The gas supply device 40 is not limited to Figures 1 to 4 the example shown. For example Figure 6 as shown, the gas supply cylinder part 50 may not protrude outside the ship. As Figure 6 shown, the discharge end part 51 of the gas supply cylinder part 50 may be exposed in the water. The discharge end part 51 of the gas supply cylinder part 50 may be opened toward the rear side in the front-rear direction D1.

[0113] Figure 6 In the example shown, the gas supply cylinder part 50 may include an air cavity in the discharge end part 51. That is, the gas supply cylinder part 50 may include an air cavity box part 45 that forms an air cavity in the discharge end part 51. An adjustment plate 53 with a plurality of holes 53a may be installed in the air cavity box part. A plurality of holes 53a may also be directly formed on the air cavity box part. By providing the air cavity box part, the spraying of gas from the gas supply device 40 to the recess 30 can be made stable.

[0114] The gas supply cylinder part 50 may include a check valve. The check valve may be provided on the pipeline 52 of the gas supply cylinder part 50. Figure 2 and Figure 3 In the example shown, the check valve may be provided on the part of the pipeline 52 that extends outside the ship's hull 20. In this example, gas can be continuously sealed in a long section of the pipeline 52 (the section from the gas supply source 45 to the check valve), and this gas can contribute to the increase in the buoyancy of the ship 10. Figure 2 and Figure 3 In the example shown, the check valve may also be provided on the part of the pipeline 52 located inside the ship's hull 20.

[0115] The gas supply cylinder part 50 may include a pressure adjustment cavity. The gas supply cylinder part 50 may include an air cavity box part that forms a pressure adjustment cavity. By providing the air cavity box part, the gas pressure in the area downstream of the air cavity box part along the gas flow path can be made stable, and the spraying of gas from the gas supply device 40 to the recess 30 can be made stable.

[0116] Next, a more detailed description will be given of the plurality of recesses 30 provided on the ship bottom 25.

[0117] As Figure 4As clearly shown, a plurality of recesses 30 are spaced apart from each other in the width direction D2. Each of the plurality of recesses 30, that is, each recess 30 extends in the front-rear direction D1. Extending in the front-rear direction D1 not only means extending parallel to the front-rear direction D1, but also means having a length in the front-rear direction D1. The recess 30 can form an angle of less than 45° with respect to the front-rear direction D1. The angle between the long side direction of the recess 30 and the front-rear direction D1 can be less than 45°, can be 30° or less, can be 20° or less, or can be 10° or less. The lower limit of the angle between the long side direction of the recess 30 and the front-rear direction D1 is not particularly set. The angle between the long side direction of the recess 30 and the front-rear direction D1 can be 0° or more, or can be greater than 0°.

[0118] As Figure 3 shown, when viewed from the width direction D2, one or more or all of the recesses 30 can be bent. One or more or all of the recesses 30 can be bent or folded when viewed from the width direction D2. As Figure 3 shown, the position of one or more or all of the recesses 30 in the up-down direction D3 along the front-rear direction D1 can be changed.

[0119] Furthermore, one or more or all of the recesses 30 can be bent upward in the up-down direction D3 behind the front-rear direction D1. That is, one or more or all of the recesses 30 can be located on the upper side of the up-down direction D3 behind the front-rear direction D1. In this example, the rear part of one or more or all of the recesses 30 in the front-rear direction D1 can be located at a position more on the upper side in the up-down direction D3 than other parts. Or one or more or all of the recesses 30 can be located on the upper side of the up-down direction D3 as they are located on the rear side of the front-rear direction D1. One or more or all of the recesses 30 can be bent throughout the entire length in such a way that they are located on the upper side of the up-down direction D3 as they are located on the rear side of the front-rear direction D1.

[0120] As Figure 4 shown, when viewed from the lower side of the up-down direction D3, one or more or all of the recesses 30 can be bent. One or more or all of the recesses 30 can be bent or folded when viewed from the up-down direction D3. As Figure 4 shown, the position of one or more or all of the recesses 30 in the width direction D2 along the front-rear direction D1 can be changed.

[0121] Furthermore, one or more or all of the recesses 30 can be bent outward in the width direction D2 behind the front-rear direction D1. That is, one or more or all of the recesses 30 can be located outside the width direction D2 behind the front-rear direction D1. In this example, one or more or all of the recesses 30 can be located at a position more outward in the width direction D2 than other parts in the rear portion in the front-rear direction D1. Or one or more or all of the recesses 30 can be located outside the width direction D2 as they are located on the rear side in the front-rear direction D1. Furthermore, one or more or all of the recesses 30 can be bent throughout the entire length in such a way that they are located outside the width direction D2 as they are located on the rear side in the front-rear direction D1.

[0122] The outside of the width direction D2 refers to the side away from the center D2C of the width direction D2. The inside of the width direction D2 refers to the side closer to the center D2C of the width direction D2.

[0123] One or more or all of the recesses 30 can be bent upward in the up-down direction D3 and outward in the width direction D2 behind the front-rear direction D1.

[0124] As Figure 4 shown, a part of the plurality of recesses 30 can be provided on one side in the width direction D2 of the bottom 25 of the ship. The remaining part of the plurality of recesses 30 can be provided on the other side in the width direction D2 of the bottom 25 of the ship.

[0125] As Figure 4 shown, the plurality of recesses 30 can be symmetrically arranged with respect to the center upper and lower surface CP that passes through the center D2C of the width direction D2 and extends in the up-down direction D3. The arrangement positions of the recesses 30 provided on one side in the width direction D2 of the bottom 25 of the ship and the arrangement positions of the recesses 30 provided on the other side in the width direction D2 of the bottom 25 of the ship can have a plane symmetry relationship with respect to the center upper and lower surface CP.

[0126] As Figure 4 shown, the plurality of recesses 30 can have a structure that is symmetric with respect to the center upper and lower surface CP that passes through the center D2C of the width direction D2 and extends in the up-down direction D3. The recesses 30 provided on one side in the width direction D2 of the bottom 25 of the ship and the recesses 30 provided on the other side in the width direction D2 of the bottom 25 of the ship can have a plane symmetry relationship with respect to the center upper and lower surface CP.

[0127] As Figure 4 shown, the propeller 23 can not be located on the extension lines of the respective plurality of recesses 30. That is, the propeller 23 can not be located on the extension lines of the respective recesses 30. In other words, the propeller 23 can be located at a position offset from the extension lines of the respective recesses 30 in the width direction D2.

[0128] Figures 1 to 4In the illustrated example, the bottom 25 of the hull includes two recesses 30. The number of recesses 30 is not limited to two. For example, the number of recesses 30 can be four as shown in Figure 7 , or six or eight. The number of recesses 30 can be an odd number, such as three, five, seven, or nine. When the number of recesses 30 is an odd number, one recess 30 can be provided on the center D2C in the width direction D2.

[0129] The cross-sectional shape of the recess 30 is not particularly limited. As shown in Figure 1 and Figure 5 , one or more or all of the recesses 30 can have a curved profile in a cross-section perpendicular to the front-rear direction D1. One or more or all of the recesses 30 can have a profile along a part of a circle in a cross-section perpendicular to the front-rear direction D1. One or more or all of the recesses 30 can have a semi-circular profile in a cross-section perpendicular to the front-rear direction D1. One or more or all of the recesses 30 can have a profile along a part of an ellipse in a cross-section perpendicular to the front-rear direction D1. One or more or all of the recesses 30 can have a semi-elliptical profile in a cross-section perpendicular to the front-rear direction D1.

[0130] As shown in Figure 8 , one or more or all of the recesses 30 can have a profile including a straight line in a cross-section perpendicular to the front-rear direction D1. As shown in Figure 8 , one or more or all of the recesses 30 can have a polygonal line profile in a cross-section perpendicular to the front-rear direction D1.

[0131] As shown in Figure 9 and Figure 10 , one or more or all of the recesses 30 can not include sharp or right-angled corners in a cross-section perpendicular to the front-rear direction D1. Figure 9 The recess 30 shown in Figure 9 contains a chamfered corner portion 32A. Figure 10 The recess 30 shown in

[0132] contains a right-angled chamfered corner portion 32A. Figure 2 The recess 30 shown in

[0133] In addition, the depression 30 may terminate after becoming shallower in depth. The downstream end (rear end) of the depression 30 may be located in a region where the bottom inclination angle θ25 of the ship bottom becomes larger, for example, a region where the bottom inclination angle θ25 of the ship bottom is 45° or more. According to this example, the gas reaching the downstream end (rear end) of the depression 30 does not unnecessarily disrupt the water flow but floats on the water surface WL.

[0134] Next, the operation of the ship 10 configured with the above structure will be described.

[0135] The ship 10 can move on water due to the functions of the hull 20 including the rudder 22 and the propeller 23. During the movement of the ship 10, the gas supply device 40 supplies gas to the bottom 25 of the hull 20. Specifically, the gas supply source 45 supplies air to the gas supply cylinder part 50, and the gas is discharged from the gas supply cylinder part 50 to the bottom 25.

[0136] The gas discharged to the bottom 25 is located between the bottom 25 and the water, so the friction between the bottom 25 and the water can be reduced. By reducing the friction between the bottom 25 and the water, the fuel efficiency can be improved. By reducing the friction between the bottom 25 and the water, the speed of the ship 10 can be increased. Further, the gas at the bottom can increase the buoyancy of the ship, which can also increase the speed of the ship. Through the above points, the environmental load can be reduced.

[0137] In the prior art (JP2010 - 120607A), gas is ejected downward in the vertical direction from the ship bottom. In such prior art, the gas ejected from the ship bottom easily moves in the width direction quickly and floats on the water surface from the ship bottom. Therefore, unless a large amount of gas is continuously ejected, the effective effects of friction reduction and buoyancy increase brought by the gas cannot be expected.

[0138] In this embodiment, a plurality of depressions 30 to which gas is supplied are provided on the bottom 25 of the ship. The plurality of depressions 30 are spaced apart from each other in the width direction D2. The plurality of depressions 30 each extend in the front - rear direction D1.

[0139] Therefore, the gas supplied to the depression 30 can flow in the depression 30 in the front - rear direction D1. That is, it is possible to suppress the gas supplied from the gas supply device 40 to the bottom 25 from immediately moving in the width direction D2 and floating from the bottom 25 to the water surface. The gas supplied to the depression 30 flows in the depression in the front - rear direction D1 for a long time, which can contribute to friction reduction and buoyancy increase.

[0140] In addition, a plurality of recesses 30 are provided in the bottom 25 of the ship. The plurality of recesses 30 are spaced apart from each other in the width direction D2. That is, in a plurality of portions in the width direction D2, the friction between the bottom 25 of the ship and the water is reduced and additional buoyancy is provided. By adjusting the positions of the plurality of recesses 30 in the width direction D2, the reduction in friction caused by the gas in the plurality of recesses 30 can prevent the straight running performance of the ship 10 from being hindered. In addition, the buoyancy caused by the gas in the plurality of recesses 30 can prevent the posture of the ship 10 from collapsing.

[0141] Thus, in the ship 10 according to the present embodiment, the gas supplied from the gas supply device 40 to the recesses 30 is effectively utilized, and the friction between the bottom 25 of the ship and the water can be more effectively reduced, and the buoyancy of the ship 10 can be increased.

[0142] In one specific example described above, a part of the plurality of recesses 30 is provided on one side in the width direction D2 of the bottom 25 of the ship. The remaining part of the plurality of recesses 30 is provided on the other side in the width direction D2 of the bottom 25 of the ship. According to this specific example, recesses 30 are formed on both sides of the center D2C in the width direction D2 of the bottom 25 of the ship. Therefore, the friction between the hull 20 and the water can be reduced on both sides of the center D2C in the width direction D2. The buoyancy of the ship 10 can be increased on both sides of the center D2C in the width direction D2. As a result, the reduction in friction caused by the gas in the plurality of recesses 30 can prevent the straight running performance of the ship 10 from being hindered. In addition, the buoyancy caused by the gas in the plurality of recesses 30 can prevent the posture of the ship 10 from collapsing.

[0143] In one specific example described above, the plurality of recesses 30 may be symmetrically arranged with respect to a plane (center upper and lower plane) CP that passes through the center D2C in the width direction D2 and extends in the up and down direction D3. According to this specific example, the reduction in friction caused by the gas in the plurality of recesses 30 can more effectively prevent the straight running performance of the ship 10 from being hindered. In addition, the buoyancy caused by the gas in the plurality of recesses 30 can more effectively prevent the posture of the ship 10 from collapsing.

[0144] In one specific example described above, the gas supply device 40 includes a gas supply source 45 and a gas supply cylinder portion 50. The gas supply source 45 supplies gas, and the gas supply cylinder portion 50 supplies the gas supplied by the gas supply source 45 to the recess 30. The gas supply cylinder portion 50 extends outward from the hull 20 to the outside of the ship. According to this specific example, the gas can be induced into the recess 30 through the gas supply cylinder portion 50 that extends from the inside of the ship to the outside of the ship. The direction (spray direction) in which the gas supply cylinder portion 50 supplies gas to the recess 30 can be adjusted with a relatively high degree of freedom. Therefore, gas can be stably supplied from the gas supply device 40 into the recess 30. It is possible to suppress the gas supplied to the recess 30 from quickly leaking from the recess 30 in the width direction. The flow of gas and water in the front-rear direction D1 (for example, from the front side to the rear side) within the recess 30 can be stabilized. Thus, the gas supplied to the recess 30 by the gas supply device 40 can be effectively utilized, and the friction reduction and buoyancy increase brought about by the gas can be more effectively achieved.

[0145] In one specific example described above, the gas supply device 40 includes a gas supply source 45 and a gas supply cylinder portion 50. The gas supply source 45 supplies gas, and the gas supply cylinder portion 50 supplies the gas supplied by the gas supply source 45 to the recess 30. The gas supply cylinder portion 50 includes a spray end portion 51 that opens to the rear side in the front-rear direction D1. According to this specific example, gas can be stably supplied from the gas supply device 40 into the recess 30. It is possible to suppress the gas supplied to the recess 30 from quickly leaking from the recess 30 in the width direction. In addition, the flow of gas and water in the front-rear direction D1 (for example, from the front side to the rear side) within the recess 30 can be stabilized. Thus, the gas supplied to the recess 30 by the gas supply device 40 can be effectively utilized, and the friction reduction and buoyancy increase brought about by the gas can be more effectively achieved.

[0146] In one specific example described above, the gas supply cylinder portion 50 includes a plurality of branch cylinder portions 55. Each of the plurality of branch cylinder portions 55 supplies gas to another recess 30 included in the plurality of recesses 30. That is, each recess 30 can be stably supplied with gas by the plurality of branch cylinder portions 55. Thus, the gas supplied to the recess 30 by the gas supply device 40 can be effectively utilized, and the friction reduction and buoyancy increase brought about by the gas can be more effectively achieved.

[0147] In one specific example described above, the hull 20 includes a propeller 23. The propeller 23 is not located on the extension line of each of the plurality of recesses 30. According to this specific example, it is possible to prevent the propeller 23 from being involved in the gas discharged from the recess 30, thereby causing a decrease in the propulsion force of the propeller 23 due to rotation.

[0148] In one specific example described above, one or more of the plurality of recesses 30, or all of the recesses 30, are bent outward in the width direction D2 on the rear side in the front-rear direction D1. According to this specific example, it is possible to suppress the gas ejected from the recess 30 to the rear side in the front-rear direction D1 from being involved in the propeller 23. Thereby, it is possible to suppress a decrease in the propulsive force generated by the rotation of the propeller 23.

[0149] In one specific example described above, one or more of the plurality of recesses 30, or all of the recesses 30, are bent upward in the vertical direction D3 on the rear side in the front-rear direction D1. According to this specific example, the buoyancy of the gas in the water can make the gas flow from the front side to the rear side in the front-rear direction D1 in the recess 30 more stable. Therefore, it is possible to make the flow of the gas and water in the front-rear direction D1 in the recess 30 (for example, from the front side to the rear side) stable. That is, it is possible to suppress the flow disorder of the gas and water in the recess and the leakage of the gas from the middle part in the front-rear direction of the recess 30. Thereby, it is possible to effectively utilize the gas supplied to the recess 30 by the gas supply device 40, and it is possible to more effectively achieve the reduction of friction and the increase of buoyancy brought by the gas.

[0150] In one specific example described above, the bottom 25 of the ship includes a low-inclination portion 26 having an angle of 30° or less formed relative to the width direction D2 in a cross-section perpendicular to the front-rear direction D1. One or more of the plurality of recesses 30, or all of the recesses 30, included in the plurality of recesses 30 are provided in the low-inclination portion 26 of the bottom 25 of the ship. According to this specific example, according to the recess 30 provided in the low-inclination portion 26, even a relatively shallow recess can stably accommodate a relatively large amount of gas. Thereby, it is possible to effectively utilize the gas supplied to the recess 30 by the gas supply device 40, and it is possible to more effectively achieve the reduction of friction and the increase of buoyancy brought by the gas. In addition, the recess 30 can be made shallower, thereby improving the rigidity of the bottom 25 of the ship.

[0151] In one specific example described above, one or more of the plurality of recesses 30, or all of the recesses 30, do not include sharp or right-angled corner portions in a cross-section perpendicular to the front-rear direction D1. According to this specific example, it is possible to suppress the formation of stagnation in the recess 30, and it is possible to make the flow of the gas and water in the front-rear direction D1 in the recess 30 (for example, from the front side to the rear side) stable. That is, it is possible to suppress the flow disorder of the gas and water in the recess and the leakage of the gas from the middle part in the front-rear direction of the recess 30. Thereby, it is possible to effectively utilize the gas supplied to the recess 30 by the gas supply device 40, and it is possible to more effectively achieve the reduction of friction and the increase of buoyancy brought by the gas. In addition, the recess 30 can be made shallower, thereby improving the rigidity of the bottom 25 of the ship.

[0152] In one embodiment described above, the ship 10 includes a hull 20 and a gas supply device 40, and the gas supply device 40 supplies gas to the bottom 25 of the hull 20. The bottom 25 is provided with a plurality of recesses 30 to which gas is supplied. The plurality of recesses 30 are spaced apart from each other in the width direction D2. Each of the plurality of recesses 30 extends in the front-rear direction D1.

[0153] According to this embodiment, the recesses 30 extend linearly in the front-rear direction D1. The gas flows in the recesses 30 in the front-rear direction D1. That is, it is possible to suppress the gas supplied from the gas supply device 40 to the bottom 25 from quickly moving in the width direction and floating from the bottom 25 to the water surface. During a relatively long period when the gas flows in the recesses 30 in the front-rear direction, the friction reduction and buoyancy increase brought by the gas can be achieved. That is, the gas supplied by the gas supply device 40 to the recesses 30 can be effectively utilized, and the friction reduction and buoyancy increase brought by the gas can be achieved.

[0154] One embodiment has been described with reference to specific examples, but the above specific examples do not limit one embodiment. The above one embodiment can be implemented in various other specific examples, and various omissions, substitutions, changes, additions, etc. can be made without departing from its gist.

[0155] Description of Reference Numerals

[0156] D1: Front-rear direction D1, D2: Width direction D2, D3: Up-down direction D3, D2C: Center, CP: Plane (center upper and lower surfaces), θ25: Bottom inclination angle, 10: Ship, 20: Hull, 21: Body, 22: Rudder, 23: Propeller, 25: Bottom, 26: Low inclination part, 27: Opening (hull opening), 31: Opening (recess opening), 30: Recess, 32A: Corner part, 32B: Corner part, 40: Gas supply device, 45: Gas supply source, 50: Gas supply cylinder part, 51: Jet end, 52: Pipe, 53: Adjusting plate, 53a: Hole, 55: Branch cylinder part, 61: First part, 62: Second part, 63: Third part

Claims

1. A ship, comprising a hull and a gas supply device, The gas supply device supplies gas to the bottom of the hull, The bottom of the hull is provided with a plurality of depressions to which the gas is supplied, The plurality of depressions are spaced apart from each other in the width direction, Each of the plurality of depressions extends in the front-rear direction, The gas supply device includes a gas supply source and a gas supply cylinder portion. The gas supply source supplies the gas, and the gas supply cylinder portion supplies the gas supplied by the gas supply source to the depressions, The gas supply cylinder portion includes a jet end portion that opens to the rear side in the front-rear direction, The depressions open to the front in the front-rear direction, The gas supply cylinder portion projects forward from the hull, The gas supply cylinder portion that projects outside the hull is inserted into the depression through the opening in front of the depression in the front-rear direction, The jet end portion is located within the depression.

2. The ship according to claim 1, wherein, A part of the plurality of depressions is provided on one side in the width direction of the bottom of the hull, The remaining part of the plurality of depressions is provided on the other side in the width direction of the bottom of the hull.

3. The ship according to claim 1, wherein, The gas supply cylinder portion includes a plurality of branch cylinder portions, Each of the plurality of branch cylinder portions supplies the gas to other depressions included in the plurality of depressions.

4. The ship according to claim 1, wherein, The plurality of depressions are symmetrically arranged with a plane passing through the center in the width direction and extending in the up-down direction as the center.

5. The ship according to claim 1, wherein, The hull includes a propeller, The propeller is not located on the extension line of each of the plurality of depressions.

6. The ship according to claim 1, wherein One or more of the depressions included in the plurality of depressions are bent outward in the width direction at the rear side in the front-rear direction.

7. The ship according to claim 1, wherein, One or more of the depressions included in the plurality of depressions are bent upward in the up-down direction at the rear side in the front-rear direction.

8. The ship according to claim 1, wherein, The bottom of the hull includes a low inclination portion having an angle of 30° or less formed with respect to the width direction in a cross section perpendicular to the front-rear direction, One or more of the depressions included in the plurality of depressions are provided on the low inclination portion of the bottom of the hull.

9. The ship according to claim 1, wherein, One or more of the depressions included in the plurality of depressions do not include an acute angle or a right angle corner portion in a cross section perpendicular to the front-rear direction.

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