Patent Grant
10266230
A portion of the disclosure of this patent document contains material which is subject to copyright protection. This patent document may show and/or describe matter which is or may become trade dress of the owner. The copyright and trade dress owner has no objection to the facsimile reproduction by anyone of the patent disclosure as it appears in the Patent and Trademark Office patent files or records, but otherwise reserves all copyright and trade dress rights whatsoever.
This patent claims priority from International PCT Patent Application No. PCT/KR2016/000610, filed Jan. 20, 2016 entitled, “FRICTIONAL RESISTANCE-REDUCING DEVICE AND SHIP INCLUDING SAME”, which claims priority to Korean Patent Application Nos. 10-2015-0092110, filed Jun. 29, 2015, and 10-2015-0190952, filed Dec. 31, 2015 all of which are incorporated herein by reference in their entirety.
Frictional resistance is generated at a hull of a sailing ship due to water. The frictional resistance is proportional to a submerged area of a hull submerged under water. A ship, especially a large ship, has a hull with a flat bottom surface. The bottom surface is a large portion of a surface area of the hull submerged under water.
An air layer may be formed at the bottom surface by air being discharged toward the bottom surface in order to reduce frictional resistance applied to the bottom surface. Specifically, air is supplied to a chamber installed on the bottom surface of the hull, and the air supplied to the chamber may be discharged toward the bottom surface through a plurality of air discharge ports provided at a lower portion of the chamber.
A hull has a reinforcement member installed at a bottom surface thereof in a longitudinal direction or a transverse direction to have sufficient structural strength. However, a chamber installed at the bottom surface may have a relatively large size. Therefore, while a large chamber is installed at the bottom surface, the reinforcement member should be removed or changed. Therefore, it is hard to maintain structural strength of the hull according to a design.
The present invention is directed to providing a frictional resistance-reducing device installed on a bottom surface of a hull while maintaining structural strength of a hull.
The present invention is directed to providing a ship in which the frictional resistance-reducing device is installed.
Objects of the present invention are not limited to the above-described objects and other objects that have not been described should be understood by those skilled in the art from the following description.
One aspect of the present invention provides a ship which includes an outer panel including an air outlet, a plurality of reinforcement members installed on an inner surface of the outer panel to be separated from each other, and a frictional resistance-reducing device formed between immediately adjacent reinforcement members among the plurality of reinforcement members on the inner surface of the outer panel to cover the air outlet, wherein the frictional resistance-reducing device includes a housing having a hollow shape with one surface that is open, and an air inlet formed in the housing, and the one open surface faces the air outlet.
The air outlet may include a plurality of air outlets, the housing may be perpendicularly coupled to the inner surface of the outer panel, the air inlet may be formed in the other surface or a side surface of the housing, and the plurality of air outlets may be disposed in the outer panel at regular intervals with respect to a virtual line in a circumferential direction.
The housing may include a body unit having a hollow shape with both side surfaces open, and one of the surfaces thereof perpendicularly coupled to the inner surface of the outer panel, and a cover unit having an air inlet formed in the center thereof and configured to cover the other surface of the body unit.
The body unit and the cover unit may be coupled to each other through a flange or welding.
The cover unit may be a blocking valve configured to prevent water outside a hull from being introduced into the hull.
The body unit may include a large diameter part having a cylinder shape, a small diameter part having a cylinder shape with a diameter relatively smaller than that of the large diameter, and a diameter changing part configured to connect the large diameter part with the small diameter part.
The housing may have a regular polygon-shaped cross section, and the number of the plurality of air outlets may be provided to be the same as that of sides of the regular polygon-shaped cross section of the housing.
The housing may have a rectangular cross section and be perpendicularly coupled to the inner side surface of the outer panel, the air inlet may be formed in the center of the other surface of the housing, and a plurality of air outlets may be disposed at an edge of the housing and positioned to be perpendicular to the outer panel at a regular distance from a virtual line.
The housing may include a plurality of housings, and the plurality of housings may be disposed in a longitudinal direction of the reinforcement member or a direction perpendicular to the longitudinal direction of the reinforcement member.
A specific area of the outer panel facing the one open surface of the housing may include a base unit having a through hole connected with an inside of the housing, and a door unit coupled to the base unit to open and close the through hole.
The air outlet may be formed in at least one location among the door unit, the base unit, and a boundary between the base unit and the door unit.
The door unit may be coupled with the base unit through a bolt.
The door unit may be hinge-coupled to the base unit to rotate toward the inside of the housing.
A boundary part of the door unit and a boundary part of the through hole may have a tapered shape to prevent the door unit from rotating outside the housing.
Another aspect of the present invention provides a frictional resistance-reducing device which includes a housing having a hollow shape with one surface that is open, and an air inlet formed at one side of the housing, wherein the one open surface of the housing may be installed to face an inner surface of an outer panel, reinforcement members reinforcing the outer panel may be disposed on both sides of the outer panel, and the housing may cover an air outlet installed in the outer panel.
The housing may include a body unit having a hollow shape with both side surfaces open and having one of the surfaces thereof perpendicularly coupled to the inner surface of the outer panel, and a cover unit having an air inlet formed in the center thereof and configured to cover the other surface of the body unit.
A specific area of the outer panel facing the one open surface of the housing may include a base unit having a through hole connected with an inside of the housing, and a door unit coupled to the base unit to open or close the through hole.
The housing may include an antifouling device installed therein.
Details of other embodiments are included in the detailed description and the accompanying drawings.
A ship according to some embodiments of the present invention can prevent structural strength thereof from being degraded by having a housing installed between a pair of immediately adjacent reinforcement members. Therefore, an additional process for reinforcing a structure of a hull can be omitted, and thus costs and time for manufacturing and installation can be reduced.
A ship according to some embodiments of the present invention includes a through hole formed in a predetermined area of an outer panel facing one open surface of a housing, and the through hole can be opened or closed via a door unit. Thus, a worker can easily perform maintenance work on the inside of the housing.
Exemplary embodiments of the present invention will be illustrated in the drawings and described in detail in the written description, but the embodiments may be changed and have many alternative forms. However, the present invention is not limited to particular modes of practice, and it should be appreciated that all changes, equivalents, and substitutes not departing from the spirit and technical scope of embodiments are encompassed in embodiments. In the description of the embodiments, certain detailed descriptions of a related art will be omitted when it is deemed that they unnecessarily obscure the essence of the inventive concept.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. When describing the invention with reference to the accompanying drawings, the same or similar elements are designated with the same numeral references, and redundant descriptions thereof will be omitted.
Referring to
The hull 10 includes an outer panel 11. The outer panel 11 includes a horizontal outer panel of a ship bottom and an inclined or vertical outer panel of a ship side. Hereinafter, in the embodiment, it is assumed that the outer panel 11 is an outer panel of the ship bottom, but the outer panel 11 is not limited thereto. For reference, in
A plurality of reinforcement members 12 are separately installed on the inner side of the outer panel 11. The reinforcement members 12 are designed so that the hull 10 has sufficient structural strength. The reinforcement members 12 have a T-shaped or L-shaped cross section, but are not limited thereto.
The frictional resistance-reducing device 100 according to some embodiments of the present invention is installed between immediately adjacent reinforcement members 12 of the plurality of reinforcement members 12 installed on the hull 10.
First, referring to
The housing 120 covers an air outlet 15 formed in the outer panel 11. The air outlet 15 covered by the housing 120 is located between the adjacent reinforcement members 12 of the reinforcement members 12 installed on the outer panel 11. The air outlet 15 may be formed to pass through the outer panel 11.
The air outlet 15 discharges air to the outside of the outer panel 11. The air discharged through the air outlet 15 forms an air layer along an outer surface of the outer panel 11. The air layer may reduce frictional resistance relative to the hull 10.
The air outlet 15 may extend in a direction perpendicular to the outer panel 11. Although not shown, the air outlet 15 may extend to be inclined relative to the outer panel 11.
A discharge direction of the air discharged from the air outlet may be determined depending on a formation direction of the air outlet 15. For example, the formation direction of the air outlet may be experimentally and experientially determined to efficiently form an air layer.
The air outlet 15 may include a plurality of air outlets. In this case, the housing 120 may cover the plurality of air outlets 15.
The housing 120 may have a hollow shape with one surface that is open. For example, the housing 120 may have a circular cross section.
For example, as shown in
Alternatively, as shown in
Although not shown, the housing may be configured of only a large diameter part or only a cone-shaped diameter changing part. Further, the housing may have a curved-pipe shape. In addition, the housing may have a hollow form with a circular cross section and various shapes.
Referring to
The housing 120 is disposed so that the one open surface between the pair of reinforcement members 12 covers the plurality of air outlets 15. The housing 120 functions as a type of chamber.
When the housing 120 functioning as a chamber is disposed between the pair of reinforcement members 12, it is not necessary for the reinforcement members installed on the outer panel 11 to be removed or changed, and thus structural strength of the hull 10 for a design is not degraded.
The housing 120 disposed as described above may be treated as fittings in accordance with a regulation of a ship's classification. In this case, an additional process for reinforcing a structure generated when the housing 120 is treated as a part of the hull 10 may be omitted. Therefore, costs and time for manufacturing and installing the housing 120 may be reduced.
The housing 120 is coupled to the inner surface of the outer panel 11. In this case, the housing 120 may be coupled to the inner surface of the outer panel 11 through welding. The housing 120 may be perpendicularly coupled to the inner surface of the outer panel 11.
Meanwhile, the housing 120 may include a body unit 121 and a cover unit 122.
The body unit 121 has a hollow shape with both surfaces open. For example, as shown in
The body unit 121 is perpendicularly coupled to the inner surface of the outer panel 11 so that the one of the open surfaces covers the plurality of air outlets 15. The cover unit 122 covers the other open surface of the body unit 121.
The cover unit 122 may be separately manufactured and coupled to the body unit 121.
For example, the body unit 121 may be coupled with the cover unit 122 through a flange. In this case, the flange 123 is formed at an end of the body unit 121 to which the cover unit 122 is coupled, and the cover unit 122 is coupled to the flange of the body unit 121 through a bolt 124 and a nut 125. In this case, although not shown, a sealing member may be interposed between the cover unit 122 and the flange 123.
Alternatively, the body unit 121 and the cover unit 122 may be coupled and welded to each other, as shown in
Meanwhile, although not shown, the housing may have a body unit and a cover unit integrally coupled with each other.
Referring to
For example, the air inlet 130 may be formed at one side of the other surface of the housing 120. The air inlet 130 may be formed in a side wall (that is, the body unit 121) of the housing 120. Further, there may be two or more air inlets 130. For example, at least two air inlets 130 may be formed in the other surface of the housing 120, may be formed in both side walls thereof, and may be formed in the other surface and the side wall.
In this case, a connection unit 140 connected with the air inlet 130 may be formed on the housing 120. The connection unit 140 may have a flange form. The connection unit 140 is connected with an air supply line (not shown) supplying air generated by an air supply source (not shown). A blocking valve (not shown) may be interposed between the connection unit 140 and the air supply line (not shown) to prevent water outside the hull from being introduced into the hull.
Alternatively, although not shown, the air inlet may be directly connected to the air supply line without the connection unit. In this case, the blocking valve may be installed in the air supply line to prevent the water outside the hull from being introduced into the hull.
The air inlet 130 provides a path through which air supplied through the air supply line (not shown) is introduced into the housing 120. The air introduced into the housing 120 may be discharged to the outside of the outer panel 11 through the plurality of air outlets 15.
Meanwhile, although not shown, the cover unit may be the blocking valve. That is, the blocking valve may be substitute for the cover unit. In this case, the blocking valve may be installed to cover the other surface of the body unit. In this case, the blocking valve may be coupled to the other surface of the body unit via a flange.
The blocking valve is connected to the air supply line. The blocking valve allows air to flow into the housing when the blocking valve is opened.
The blocking valve prevents the water outside the hull from being introduced into the hull when the blocking valve is closed. For example, when operation of the frictional resistance-reducing device according to the embodiment of the present invention is stopped, the blocking valve is closed to block the water outside the hull from flowing into the hull backward.
Referring to
When the housing 120 is perpendicularly coupled to the outer panel 11 and the air inlet 130 is formed in the center of the other surface of the housing 120, a virtual line C (see
Further,
The plurality of air outlets 15 may be disposed in a circumferential direction with respect to the virtual line C at regular intervals.
In other words, as shown in
In this case, the plurality of air outlets 15 have a structure symmetrical with respect to the virtual line C, and air introduced through the air inlet 130 and moving along the virtual line C may be uniformly discharged toward the outer panel 11 through the plurality of air outlets 15 with the symmetrical structure.
The air uniformly discharged through the plurality of air outlets forms an optimal air layer on the surface of the hull 10 or is maintained to reduce the frictional resistance relative to the hull 10. Meanwhile, referring to
In this case, the plurality of housings 120 may be separately distributed in at least one direction of the longitudinal direction of the reinforcement member 12 and the direction perpendicular to the longitudinal direction of the reinforcement member 12 to cover at least one of the plurality of air outlets formed on the outer panel 11.
The plurality of housings 120 are disposed in the direction perpendicular to the longitudinal direction of the reinforcement members 12 and, as shown in
Referring to
The housing 220 has one surface that is open and has an air inlet (not shown) formed in the center of the other surface thereof.
The housing 220 may be disposed so that the one open surface between a pair of reinforcement members 12 covers the plurality of air outlets 15. The housing 220 may be perpendicularly coupled to an inner surface of the outer panel 11.
In this case, the number of the plurality of air outlets 15 that the housing 220 covers may be provided to be the same as the number of sides of the regular polygon-shaped cross section of the housing 220. For example, when the housing 200 has a square-shaped cross section, as shown in
The plurality of air outlets 15 are disposed to be perpendicular to the outer panel 11 at regular intervals about a virtual line C in a circumferential direction. In this case, air introduced into the housing 220 through an air inlet (not shown) may be uniformly discharged toward the outer panel 11 through the air outlets 15.
Although not shown, like the housing 120 shown in
Referring to
The number of the plurality of air outlets 15 that the housing 320 covers may be four, which is the same number of sides of the rectangular cross section of the housing 320. In this case, the plurality of air outlets 15 may be disposed on an edge of the housing 320.
The plurality of air outlets 15 are positioned to be perpendicular to the outer panel 11 at the same distance from a virtual line C. In this case, the plurality of air outlets 15 may have a structure symmetrical with respect to the center of the virtual line C. When the air outlets 15 are disposed as described above, air introduced into the housing 320 through an air inlet (not shown) may be uniformly discharged toward the outer panel 11 through the air outlets 15.
Although not shown, like the housing 120 shown in
First, referring to
The housing 120 covers the air outlet 15 formed on the outer panel 11. The air outlet 15 that the housing 120 covers is located between a pair adjacent of reinforcement members 12 among the reinforcement members 12 installed on the outer panel 11. The air outlet 15 may be formed to pass through the outer panel 11.
Air is discharged to the outside of the outer panel 11 through the air outlet 15. The air discharged through the air outlet 15 forms an air layer along an outer surface of the outer panel 11. The air layer may reduce frictional resistance relative to the hull 10.
An antifouling device may be installed in the housing 120. For example, the antifouling device may include an anode 20.
The housing 120 may have a hollow shape with one surface that is open. In this case, the housing 120 may have a circular cross section. For example, as shown in
Alternatively, as shown in
Referring to
The housing 120 is coupled to the inner surface of the outer panel 11.
The housing 120 may include a body unit 121 and a cover unit 122.
The body unit 121 has a hollow shape with both surfaces open. The body unit 121 is perpendicularly coupled to the inner surface of the outer panel 11 so that the one of the open surfaces covers the plurality of air outlets 15. The cover unit 122 covers the other open surface of the body unit 121.
The cover unit 122 may be separately manufactured and may be coupled to the body unit 121.
For example, the body unit 121 and the cover unit 122 may be coupled through a flange.
Alternatively, the body unit 121 and the cover unit 122 may be coupled through welding, as shown in
Meanwhile, although not shown, the housing may include a body unit and an cover unit that are integrally formed.
Referring to
A through hole 40 connected with the inside of the housing 120 may be formed in the base unit 31. A worker may perform work on the inside of the housing 120 through the through hole 40 formed in the base unit 31. For example, the worker may use the through hole 40 formed in the base unit 31 to replace the anode 20 in the housing 120. In addition, the worker may easily perform maintenance and repair work on the inside of the housing 120 through the through hole 40.
The through hole 40 may have a circular shape, as shown in
The door unit 32 opens or closes the through hole 40. The air outlets 15 may be formed on the door unit 32.
The door unit 32 may be coupled to the base unit 31.
For example, the door unit 32 may be coupled to the base unit 31 through a bolt, as shown in
An insertion groove (not shown) into which a head of the bolt is inserted so that the bolt is not exposed to the outside may be formed in the door unit 32.
A plurality of support units 50 may be provided, as shown in
The support unit 50 may be disposed in the housing 120, as shown in
Referring to
Further, a boundary part of the door unit 32 and a boundary part of the through hole 40 may have a tapered shape to prevent the door unit 32 from rotating outside the housing 120.
When the door unit 32 hinge-coupled to the base unit 31 is closed, the door unit 32 may be coupled to the base unit 31 in a bolt-coupling method, as shown in
In the frictional resistance-reducing device according to the sixth embodiment of the present invention, the air outlet 15 may be formed on the base unit 31, as shown in
In the frictional resistance-reducing device according to the sixth embodiment of the present invention, as shown in
Embodiments of the present invention have been described above, but it should be understood by those skilled in the art that various changes and modifications may be made therein by addition, substitution, or removal of components without departing from the spirit and scope of the present invention as defined by the appended claims. Such changed and modified embodiments are also included within the scope of the appended claims.
10: HULL
11: OUTER PANEL
12: REINFORCEMENT MEMBERS
15: AIR OUTLET
20: ANODE
30: SPECIFIC AREA
31: BASE UNIT
32: DOOR UNIT
40: THROUGH HOLE
50: SUPPORT UNIT
100, 200, 300: FRICTIONAL RESISTANCE-REDUCING DEVICE
120, 220, 320: HOUSING
121: BODY UNIT
122: COVER UNIT
123: FLANGE
123
124: BOLT
125: NUT
126: LARGE DIAMETER PART
127: SMALL DIAMETER PART
128: DIAMETER CHANGING PART
130: AIR INLET
140: CONNECTION UNIT
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2015-0092110 | Jun 2015 | KR | national |
| 10-2015-0190952 | Dec 2015 | KR | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/KR2016/000610 | 1/20/2016 | WO | 00 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2017/003058 | 1/5/2017 | WO | A |
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|---|---|---|---|
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| Number | Date | Country |
|---|---|---|
| 0903287 | Mar 1999 | EP |
| H1035578 | Feb 1998 | JP |
| H11-027675 | Jan 1999 | JP |
| 2000128063 | May 2000 | JP |
| 2000128063 | May 2000 | JP |
| 2008120246 | May 2008 | JP |
| 2008143345 | Jun 2008 | JP |
| 2014125033 | Jul 2014 | JP |
| 2015-081043 | Apr 2015 | JP |
| 2015081043 | Apr 2015 | JP |
| 2015081043 | Apr 2015 | JP |
| 100441723 | Jul 2004 | KR |
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| 2013002182 | Jan 2013 | WO |
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| Entry |
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| Japan Intellectual Property Office, Office Action for Japanese Patent Application No. 2017-567181, dated Oct. 1, 2018, 5 pages. |
| World Intellectual Property Organization, International Search Report for international application No. PCT/KR2016/000610, dated Apr. 8, 2015, 5 total pages. |
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| Number | Date | Country | |
|---|---|---|---|
| 20180186431 A1 | Jul 2018 | US |
