JP2011105185A - Resistance reducing apparatus of ship - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resistance reducing apparatus of a ship and a method for manufacturing the same capable of reducing the energy required to blow out air into water. <P>SOLUTION: The resistance reducing apparatus of the ship includes a gas chamber provided in a hull, a partition wall 30 partitioning the inside of the gas chamber and the water outside of the hull, and an air blowout port 40 provided on the partition wall 30. The air blowout port 40 includes an air passage 41 communicating the inside of the gas chamber and the water. The air passage 41 includes an air passage end part 42 on the water side. The air passage end part 42 is formed so that a flow passage area is increased toward a first end 41b of the air passage 41 on the water side. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a resistance reducing device that reduces the frictional resistance of a hull by air blowing and a method for manufacturing the same.

  There is known a technique for reducing hull frictional resistance by covering a lower part of a hull draft line such as a ship bottom with a bubble flow during navigation.

  Patent document 1 is disclosing the frictional resistance reduction type | formula ship which blows out air underwater from a ship side and a ship bottom, and reduces the frictional resistance of a hull.

  Patent Document 2 discloses a structure of an air outlet for blowing air into water. The structure of the air outlet will be described with reference to FIG. The air supply nozzle 4 is disposed in the outer plate 5 of the hull 1 and extends in the lateral direction, and a slit 7 that opens rearward in the outer plate 5 and communicates with the air supply header 6. Is provided. The air supply device supplies air a to the air supply header 6.

JP-A-11-321775 JP-A-10-119876

  The objective of this invention is providing the resistance reduction apparatus of the ship which requires little energy in order to blow off air in water, and its manufacturing method.

  The means for solving the problem will be described below using the numbers used in the (DETAILED DESCRIPTION). These numbers are added to clarify the correspondence between the description of (Claims) and (Mode for Carrying Out the Invention). However, these numbers should not be used to interpret the technical scope of the invention described in (Claims).

  The ship resistance reduction device (20) according to the present invention includes a gas chamber (22) provided in a hull (10), a partition wall (30) that partitions the gas chamber and water outside the hull, and the partition. And an air outlet (40) provided on the wall. The air outlet includes an air passage (41) communicating the gas chamber and the water. The air passage includes a first air passage end (42) on one side of the gas chamber and the water. The first air passage end is formed such that the flow passage area increases toward the first end (41a, 41b) on the one side of the air passage.

  The partition wall includes a partition plate (31) that partitions the gas chamber and the water. The air passage is formed in the partition plate. The partition plate includes a first peripheral portion (31c) around the end portion of the first air passage. An R or linear slope is formed in the first peripheral portion so that the flow path area of the first air passage end portion increases smoothly toward the first end.

  The air passage includes a second air passage end (42) on the other side of the gas chamber and the water. The partition plate includes a second peripheral portion (31c) around the end portion of the second air passage. The second peripheral portion is R or linearly inclined so that the flow area of the second air passage end increases smoothly toward the second end (41b, 41a) on the other side of the air passage. Is formed.

  The partition wall is attached to a partition plate (31) for partitioning the gas chamber and the water, and to the gas chamber of the partition plate and the first surface (31a, 31b) on the one side in the water. 1 device (32). The air passage includes an air passage partition plate portion (43) formed in the partition plate. The flow passage area of the air passage partition plate portion is constant along the air flow direction. The first air passage end is formed in the first device. The first device comprises a first peripheral portion (32a) around the end of the first air passage. An R or linear slope is formed in the first peripheral portion so that the flow passage area of the first air passage end portion increases smoothly toward the first end of the air passage.

  The partition wall includes a second device (32) attached to the partition plate and the second surface (31b, 31a) on the other side of the water. The air passage includes a second air passage end (42) on the other side of the gas chamber and the water. The second air passage end is formed in the second device. The second device comprises a second peripheral portion (32a) around the end of the second air passage. The second peripheral portion is R or linearly inclined so that the flow area of the second air passage end increases smoothly toward the second end (41b, 41a) on the other side of the air passage. Is formed.

  The one of the gas chamber and the water is the water. An R or linear slope is formed on the edge portion (32b) of the first device to reduce water resistance.

  The partition wall is attached to a partition plate (31) for partitioning the gas chamber and the water, and to the gas chamber of the partition plate and the first surface (31a, 31b) on the one side in the water. 1 device (32). The air passage includes an air passage partition plate portion (43) formed in the partition plate and an air passage device portion (44) formed in the first device. The flow passage area of the air passage partition plate portion is constant at the first area value along the air flow direction. The flow path area of the air passage device portion is constant at the second area value along the air flow direction. The air passage partition plate portion includes a device side portion (43a) on the first device side. The first air passage end includes the device side portion and the air passage device portion. The second area value is greater than the first area value.

  The resistance reduction device further includes another air outlet (40) provided in the partition wall. The other air outlet includes another air passage (41) communicating the gas chamber and the water. The other air passage includes the gas chamber and another first air passage end (42) on the one side in the water. The other first air passage end is formed such that the flow passage area increases toward the other first end (41a, 41b) on the one side of the other air passage. The other air passage includes another air passage partition plate portion (43) formed in the partition plate and another air passage device portion (44) formed in the first device. The flow path area of the other air passage partition plate portion is constant at another first area value along the air flow direction. The flow path area of the other air passage device portion is constant at another second area value along the air flow direction. The other air passage partition plate portion includes another device side portion (43a) on the first device side. The other first air passage end includes the other device side portion and the other air passage device portion. The other second area value is larger than the other first area value.

  The partition wall includes a partition plate (31) that partitions the gas chamber and the water, and a device (32) that is fitted or screwed into a through hole (31d) formed in the partition plate. The air passage is formed in the device. The device comprises a first peripheral portion (32a) around the end of the first air passage. An R or linear slope is formed in the first peripheral portion so that the flow path area of the first air passage end portion increases smoothly toward the first end.

  The air passage includes a second air passage end (42) on the other side of the gas chamber and the water. The device includes a first device (32) fitted or screwed into the through hole from the one side in the gas chamber and the water, and the through hole from the other side in the gas chamber and the water. A second device (32) fitted or screwed. The first air passage end is formed in the first device. The first device comprises the first surrounding portion. The second air passage end is formed in the second device. The second device comprises a second peripheral portion (32a) around the end of the second air passage. The second peripheral portion is R or linearly inclined so that the flow area of the second air passage end increases smoothly toward the second end (41b, 41a) on the other side of the air passage. Is formed.

  In the method of manufacturing a ship resistance reducing apparatus according to the present invention, the partition plate through hole (43) formed in the partition plate (31) and the first device through hole (42) formed in the first device (32) are hulls. (10) welding the first device to the partition plate so as to form an air passage (41) communicating the inside of the gas chamber (22) provided in the interior and the water outside the hull. . The partition plate partitions the gas chamber from the water. The flow path area of the partition plate through-hole is constant along the air flow direction. The first device includes a first peripheral portion (32a) around the first device through hole. The first peripheral portion has an R or linear slope so that the flow path area of the first device through hole smoothly increases toward the first end (42a) of the first device through hole of the first device through hole. Is formed. In the step of welding the first device, the first end of the first device through hole forms one end (41a, 41b) of the air passage on one side of the gas chamber and the water in the air passage. , Welding the first device to the one side of the partition plate.

  The ship resistance reducing device manufacturing method according to the present invention includes a partition plate through hole (43) formed in the partition plate (31), a first device through hole (42) formed in the first device, and a second device. The second device through hole (42) formed in the air hose (10) forms an air passage (41) that communicates the gas chamber (22) provided in the hull (10) with the water outside the hull. Welding the first device and the second device to the partition plate. The partition plate partitions the gas chamber from the water. The flow path area of the partition plate through-hole is constant along the air flow direction. The first device includes a first peripheral portion (32a) around the first device through hole. The first peripheral portion has an R or linear slope so that the flow path area of the first device through hole smoothly increases toward the first end (42a) of the first device through hole of the first device through hole. Is formed. The second device includes a second peripheral portion (32a) around the second device through hole. The second peripheral portion has an R or linear slope so that the flow path area of the second device through hole smoothly increases toward the second device through hole first end (42a) of the second device through hole. Is formed. In the step of welding the first device and the second device, the first device through-hole first end is one end (41a, 41b) of the air passage on one side of the gas chamber and the water in the air passage. Welding the first device to the one side of the partition plate so that the first end of the second device through-hole is on the other side of the gas chamber and the water in the air passage. Welding the second device to the other side of the partition plate so as to form the other end (41b, 41a) of the air passage.

  The one is the water. An R or linear slope is formed on the edge portion (32b) of the first device to reduce water resistance.

  According to the manufacturing method of a ship resistance reducing apparatus according to the present invention, the partition plate through hole (43) formed in the partition plate (31) and the first device through hole (44) formed in the first device (32) are hulls. (10) The step of welding the first device (32) to the partition plate so as to form an air passage (41) that communicates the inside of the gas chamber (22) provided in the interior and the water outside the hull. It comprises. The partition plate partitions the gas chamber from the water. The flow path area of the partition plate through hole is constant at the first area value along the air flow direction. The flow path area of the first device through hole is constant at the second area value along the air flow direction. The second area value is greater than the first area value.

  Another partition plate through hole (43) is formed in the partition plate. Another first device through hole (44) is formed in the first device. In the step of welding the first device, the other partition plate through hole and the other first device through hole form another air passage (41) for communicating the gas chamber and the water. The first device is welded to the partition plate. The flow path area of the other partition plate through hole is constant at another first area value along the air flow direction. The flow path area of the other first device through hole is constant at another second area value along the air flow direction. The other second area value is larger than the other first area value.

  In the method for manufacturing a ship resistance reducing apparatus according to the present invention, the device through hole (41) formed in the device (32) is provided in the gas chamber (22) provided in the hull (10), and in the water outside the hull. The device includes a step of fitting or screwing the device into a partition plate through hole (31d) formed in the partition plate (31) that partitions the gas chamber and the water so as to form an air passage that communicates with each other. The device includes a peripheral portion (32a) around the device through hole. An R or a linear inclination is formed in the peripheral portion so that the flow path area of the device through hole increases smoothly toward the device through hole first end (41a, 41b) of the device through hole. In the step of fitting or screwing in the device, the device through hole is formed so that the first end of the device through hole forms one end of the air passage on one side of the air chamber and the water passage. Fit or screw in.

  In the manufacturing method of the ship resistance reducing apparatus according to the present invention, the first device through hole (42) formed in the first device (32) and the second device through hole (42) formed in the second device are formed in the hull ( 10) Formed in a partition plate (31) for partitioning the gas chamber and the water so as to form an air passage (41) for communicating the inside of the gas chamber (22) provided in the water and the water outside the hull. A step of fitting or screwing the first device and the second device into the formed partition plate through hole (31d). The first device includes a first peripheral portion (32a) around the first device through hole. The first peripheral portion has an R or linear slope so that the flow path area of the first device through hole smoothly increases toward the first end (42a) of the first device through hole of the first device through hole. Is formed. The second device includes a second peripheral portion (32a) around the second device through hole. The second peripheral portion has an R or linear slope so that the flow path area of the second device through hole smoothly increases toward the second device through hole first end (42a) of the second device through hole. Is formed. In the step of fitting or screwing in the first device and the second device, the first device first end is one end (41a, 41b) of the air passage on one side of the gas chamber and the water in the air passage. A step of fitting or screwing the first device into the partition plate through-hole from the one side so as to form the second device, and the second end of the second device is the other side of the gas chamber of the air passage and the other side of the water Fitting or screwing the first device into the partition plate through-hole from the other side so as to form the other end (41b, 41a) of the air passage.

  ADVANTAGE OF THE INVENTION According to this invention, the ship's resistance reduction apparatus with little energy required in order to blow off air in water, and its manufacturing method are provided.

FIG. 1 is a cross-sectional view of a conventional air supply nozzle. FIG. 2 is a side view of a ship provided with the resistance reduction device according to the first embodiment of the present invention. FIG. 3 is a conceptual diagram of the resistance reduction device according to the first embodiment. FIG. 4A is a cross-sectional view of the partition wall of the resistance reduction device according to the first embodiment. FIG. 4B is a cross-sectional view of the partition wall according to the first modification example of the first embodiment. FIG. 4C is a cross-sectional view of a partition wall according to a second modification of the first embodiment. FIG. 5A is a cross-sectional view of a partition wall according to a second embodiment of the present invention. FIG. 5B is a cross-sectional view of a partition wall according to a first modification of the second embodiment. FIG. 5C is a cross-sectional view of a partition wall according to a second modification of the second embodiment. FIG. 5D is a cross-sectional view of a partition wall according to a third modification of the second embodiment. FIG. 5E is a cross-sectional view of an air outlet according to a fourth modification of the second embodiment. FIG. 6A is a cross-sectional view of a partition wall according to a third embodiment of the present invention. FIG. 6B is a cross-sectional view illustrating the manufacturing process of the resistance reduction device according to the third embodiment. FIG. 7A is a cross-sectional view of a partition wall according to a first modification of the third embodiment. FIG. 7B is a cross-sectional view of a partition wall according to a second modification of the third embodiment. FIG. 7C is a cross-sectional view of a partition wall according to a third modification of the third embodiment. FIG. 7D is a cross-sectional view of a partition wall according to a fourth modification example of the third embodiment. FIG. 8A is a cross-sectional view of a partition wall according to a fourth embodiment of the present invention. FIG. 8B is a cross-sectional view illustrating the manufacturing process of the resistance reduction device according to the fourth embodiment. FIG. 9A is a cross-sectional view of a partition wall according to a first modification example of the fourth embodiment. FIG. 9B is a cross-sectional view illustrating a manufacturing process of the resistance reduction device according to the first modification example of the fourth embodiment.

  With reference to the accompanying drawings, a mode for carrying out a ship drag reduction device and a manufacturing method thereof according to the present invention will be described below.

(First embodiment)
FIG. 2 shows a side view of the ship according to the first embodiment of the present invention. A gas chamber 22 is provided in the hull 10 of the ship according to the first embodiment. The gas chamber 22 is arranged in a portion from the bow 11 on the ship side 14 and a portion from the bow 11 in the bottom 13. The gas chamber 22 is disposed in the draft portion. The stern 12 is provided with a propeller for propulsion and a rudder.

  Referring to FIG. 3, the ship resistance reduction device 20 according to the present embodiment includes an air supply device 21 such as a compressor, a gas chamber 22, a partition wall that partitions the gas chamber 22 and the water outside the hull 10. 30 and an air outlet 40 provided in the partition wall 30. The partition wall 30 includes a partition plate 31 provided so as to be flush with the outer plate 15 of the hull 10. The partition plate 31 partitions the gas chamber 22 from the water. The outer plate 15 is disposed on a part of the ship side 14 from the bow 11 or a part of the ship bottom 13 from the bow 11. The partition plate 31 includes a gas chamber side surface 31a facing the gas chamber 22 and an underwater side surface 31b facing the water. For example, the underwater side surface 31b and the outer surface of the outer plate 15 are continuous. The air supply device 21 supplies air into the gas chamber 22. Air is blown out into the water from the gas chamber 22 through the air outlet 40.

  Referring to FIG. 2, the air blown out from the gas chamber 22 into the water during navigation of the ship forms an air layer (a layer containing many bubbles) 200. The air layer 200 flows toward the stern 12 along the bottom 13 and the side 14. The air layer 200 reduces the frictional resistance of the hull 10.

  With reference to FIG. 4A, the partition wall 30 which concerns on this embodiment is demonstrated in detail. The air outlet 40 includes an air passage 41 that allows communication between the gas chamber 22 and the water. The air passage 41 is a circular hole having a circular cross section. The air passage 41 penetrates the partition plate 31 from the gas chamber side surface 31a to the underwater side surface 31b. The air passage 41 includes an end 41a on the gas chamber 22 side and an underwater side 41b. The air passage 41 includes an air passage end 42 on the underwater side. The partition plate 31 includes a peripheral portion 31 c around the air passage end portion 42. R is formed in the peripheral portion 31c so that the flow passage area of the air passage end portion 42 increases smoothly toward the end 41b. Here, the radius r of R formed in the peripheral portion 31 c is smaller than the thickness D of the partition plate 31. Accordingly, the flow passage area of the portion of the air passage 41 other than the air passage end portion 42 is constant along the air flow direction (the thickness direction of the partition plate 31).

  Since the flow path area of the air passage end portion 42 increases toward the end 41b, air smoothly flows out from the air passage 41 into the water. Therefore, the air blowing resistance at the air blowing port 40 is small, and the energy for blowing air into the water can be small.

  The air passage end 42 may be the end of the air passage 41 on the gas chamber 22 side. In this case, the flow passage area of the air passage end 42 increases toward the end 41a. The air smoothly flows from the gas chamber 22 into the air passage 41. Therefore, the air blowing resistance at the air blowing port 40 is small, and the energy for blowing air into the water can be small.

(First modification of the first embodiment)
With reference to FIG. 4B, the partition wall 30 which concerns on the 1st modification of the 1st Embodiment of this invention is demonstrated. The partition wall 30 according to the first modification of the first embodiment is the same as the partition wall 30 according to the first embodiment except for the points described below.

  The partition plate 30 includes a peripheral portion 31 c around the air passage 41. R is formed in the peripheral portion 31 c so that the flow passage area of the air passage 41 increases smoothly toward the end 41 b of the air passage 41. Here, the radius r of R formed in the peripheral portion 31 c is equal to or greater than the thickness D of the partition plate 31. Therefore, not only the air passage end portion 42 on the underwater side of the air passage 41 but also the entire flow passage area from the end 41a to the end 41b of the air passage 41 increases smoothly toward the end 41b.

  Since the flow passage area of the air passage 41 increases toward the end 41b over the entire air passage 41, the air smoothly flows out from the air passage 41 into the water.

  Note that R may be formed in the peripheral portion 31c so that the flow passage area of the air passage 41 increases smoothly toward the end 41a of the air passage 41. In this case, since the flow passage area of the air passage 41 increases toward the end 41 a over the entire air passage 41, air smoothly flows from the gas chamber 22 into the air passage 41.

(Second modification of the first embodiment)
With reference to FIG. 4C, the partition wall 30 which concerns on the 2nd modification of the 1st Embodiment of this invention is demonstrated. The partition wall 30 according to the second modification of the first embodiment is the same as the partition wall 30 according to the first embodiment except for the points described below.

  The air passage 41 includes an air passage end 42 on the gas chamber 22 side and an air passage end 42 on the underwater side. The partition plate 31 includes a peripheral portion 31 c around the air passage end 42 on the gas chamber 22 side. Hereinafter, the peripheral portion 31c is referred to as a peripheral portion 31c on the gas chamber 22 side. The partition plate 31 includes a peripheral portion 31c around the air passage end portion 42 on the underwater side. Hereinafter, the peripheral portion 31c is referred to as an underwater peripheral portion 31c. R is formed in the peripheral portion 31c on the gas chamber 22 side so that the flow passage area of the air passage end portion 42 on the gas chamber 22 side increases smoothly toward the end 41a. R is formed in the surrounding portion 31c on the underwater side so that the flow passage area of the air passage end portion 42 on the underwater side increases smoothly toward the end 41b. The air passage 41 may or may not include an intermediate portion between the two air passage end portions 42. The intermediate portion of the air passage 41 has a constant flow path area along the air flow direction (the thickness direction of the partition plate 31).

  Since the flow passage area of the air passage end portion 42 on the gas chamber 22 side increases toward the end 41a, air smoothly flows from the gas chamber 22 into the air passage 41. Since the flow path area of the air passage end portion 42 on the underwater side increases toward the end 41b, air smoothly flows out of the air passage 41 into the water.

(Second Embodiment)
With reference to FIG. 5A, the partition wall 30 which concerns on the 2nd Embodiment of this invention is demonstrated. The partition wall 30 according to the second embodiment is the same as the partition wall 30 according to the first embodiment except for the points described below.

  The air passage 41 includes an air passage end 42 on the underwater side. The partition plate 31 includes a peripheral portion 31 c around the air passage end portion 42. A linear inclination is formed in the peripheral portion 31c so that the flow path area of the air passage end portion 42 increases smoothly toward the end 41b. A portion of the air passage 41 other than the air passage end 42 has a constant flow path area along the air flow direction (the thickness direction of the partition plate 31).

  Since the flow path area of the air passage end portion 42 increases toward the end 41b, air smoothly flows out from the air passage 41 into the water.

  The air passage end 42 may be the end of the air passage 41 on the gas chamber 22 side. In this case, the flow passage area of the air passage end 42 increases toward the end 41a. The air smoothly flows from the gas chamber 22 into the air passage 41.

(First Modification of Second Embodiment)
With reference to FIG. 5B, the partition wall 30 which concerns on the 1st modification of the 2nd Embodiment of this invention is demonstrated. The partition wall 30 according to the first modification of the second embodiment is the same as the partition wall 30 according to the second embodiment except for the points described below.

  The partition plate 30 includes a peripheral portion 31 c around the air passage 41. A linear slope is formed in the peripheral portion 31 c so that the flow passage area of the air passage 41 increases smoothly toward the end 41 b of the air passage 41. Therefore, not only the air passage end portion 42 on the underwater side of the air passage 41 but also the entire flow passage area from the end 41a to the end 41b of the air passage 41 increases smoothly toward the end 41b.

  Since the flow passage area of the air passage 41 increases toward the end 41b over the entire air passage 41, the air smoothly flows out from the air passage 41 into the water.

  Note that a linear inclination may be formed in the peripheral portion 31 c so that the flow passage area of the air passage 41 increases smoothly toward the end 41 a of the air passage 41. In this case, since the flow passage area of the air passage 41 increases toward the end 41 a over the entire air passage 41, air smoothly flows from the gas chamber 22 into the air passage 41.

(Second modification of the second embodiment)
With reference to FIG. 5C, the partition wall 30 which concerns on the 2nd modification of the 2nd Embodiment of this invention is demonstrated. The partition wall 30 according to the second modification of the second embodiment is the same as the partition wall 30 according to the second embodiment except for the points described below.

  Through the entire air passage 41, the flow path area smoothly increases from the end 41a toward the end 41b. The air passage 41 includes an air passage end 42 on the underwater side. The partition plate 31 includes a peripheral portion 31 c around the air passage end portion 42. R is formed in the peripheral portion 31c so that the flow passage area of the air passage end portion 42 increases smoothly toward the end 41b. A portion of the partition plate 31 surrounding the air passage 41 other than the air passage end 42 is formed with a linear inclination.

  Since the flow path area increases toward the end 41b over the entire air passage 41, the air smoothly flows out from the air passage 41 into the water. Since R is formed in the peripheral portion 31c around the air passage 42, the outflow of air into the water becomes even smoother.

  The flow passage area may increase smoothly from the end 41b to the end 41a over the entire air passage 41, and the air passage end 42 may be the end of the air passage 41 on the gas chamber 22 side. In this case, air smoothly flows from the gas chamber 22 into the air passage 41. Since R is formed in the peripheral portion 31c around the air passage 42, the air flow into the air passage 41 becomes even smoother.

(Third Modification of Second Embodiment)
With reference to FIG. 5D, the partition wall 30 which concerns on the 3rd modification of the 2nd Embodiment of this invention is demonstrated. The partition wall 30 according to the third modification of the second embodiment is the same as the partition wall 30 according to the second embodiment except for the points described below.

  The air passage 41 includes an air passage end 42 on the gas chamber 22 side and an air passage end 42 on the underwater side. The partition plate 31 includes a peripheral portion 31 c around the air passage end 42 on the gas chamber 22 side. Hereinafter, the peripheral portion 31c is referred to as a peripheral portion 31c on the gas chamber 22 side. The partition plate 31 includes a peripheral portion 31c around the air passage end portion 42 on the underwater side. Hereinafter, the peripheral portion 31c is referred to as an underwater peripheral portion 31c. A linear slope is formed in the peripheral portion 31c on the gas chamber 22 side so that the flow passage area of the air passage end portion 42 on the gas chamber 22 side increases smoothly toward the end 41a. A linear slope is formed in the peripheral portion 31c on the underwater side so that the flow area of the air passage end portion 42 on the underwater side increases smoothly toward the end 41b. The air passage 41 may or may not include an intermediate portion between the two air passage end portions 42. The intermediate portion of the air passage 41 has a constant flow path area along the air flow direction (the thickness direction of the partition plate 31).

  Since the flow passage area of the air passage end portion 42 on the gas chamber 22 side increases toward the end 41a, air smoothly flows from the gas chamber 22 into the air passage 41. Since the flow path area of the air passage end portion 42 on the underwater side increases toward the end 41b, air smoothly flows out of the air passage 41 into the water.

(Fourth modification of the second embodiment)
With reference to FIG. 5E, the partition wall 30 which concerns on the 4th modification of the 2nd Embodiment of this invention is demonstrated. The partition wall 30 according to the fourth modification example of the second embodiment is the same as the partition wall 30 according to the third modification example of the second embodiment except for the points described below.

  R is formed in the surrounding portion 31c on the underwater side so that the flow passage area of the air passage end portion 42 on the underwater side increases smoothly toward the end 41b.

  Note that a linear slope may be formed in the surrounding portion 31c on the underwater side, and R may be formed in the surrounding portion 31c on the gas chamber 22 side.

(Third embodiment)
With reference to FIG. 6A, the partition wall 30 which concerns on the 3rd Embodiment of this invention is demonstrated. The partition wall 30 according to the third embodiment is the same as the partition wall 30 according to the first embodiment except for the points described below.

  The partition wall 30 includes a device 32 attached to the gas chamber side surface 31a of the partition plate 31 by welding. The air passage 41 passes through the partition plate 31 and the device 32. The air passage 41 includes an end 41a on the gas chamber 22 side and an underwater side 41b. The air passage 41 includes an air passage end 42 formed in the device 32 and an air passage partition plate portion 43 formed in the partition plate 31. The air passage end 42 is an end of the air passage 41 on the gas chamber 22 side, and is a through hole formed in the device 32. Device 32 includes a peripheral portion 32 a around air passage end 42. A linear inclination is formed in the peripheral portion 32a so that the flow path area of the air passage end portion 42 increases smoothly toward the end 41a. The air passage partition plate portion 43 is a through hole that penetrates the partition plate 31 from the gas chamber side surface 31a to the underwater side surface 31b. The flow path area of the air passage partition plate portion 43 is constant along the air flow direction (the thickness direction of the partition plate 31).

  Since the flow path area of the air passage end portion 42 increases toward the end 41 a, air flows smoothly from the gas chamber 22 into the air passage 41.

  With reference to FIG. 6B, the manufacturing method of the resistance reduction apparatus 20 which concerns on 3rd Embodiment is demonstrated. Initially, the device 32 is not attached to the partition plate 31. The device 32 is formed with a through hole 42 to be the air passage end 42. The peripheral portion 32 a surrounds the through hole 42. A linear inclination is formed in the peripheral portion 32a so that the flow passage area of the through hole 42 increases smoothly toward the end 42a of the through hole 42. The partition plate 31 is formed with a through hole 43 to be the air passage partition plate portion 43. The flow path area of the through-hole 43 is constant along the air flow direction (thickness direction of the partition plate 31).

  The device 32 is welded to the partition plate 31 such that the through hole 42 and the through hole 43 form the air passage 41. Here, the device 32 is welded to the gas chamber side surface 31 a of the partition plate 31 so that the end 42 a of the through hole 42 forms an end 41 a of the air passage 41 on the gas chamber 22 side.

  According to the present embodiment, the air blowing port 40 having a small air blowing resistance is formed simply by welding the device 32 to the partition plate 31. Manufacture is easier than when the through-holes 43 formed in the partition plate 31 are processed so as to reduce the air blowing resistance. Furthermore, the air blowing port 40 according to the present embodiment is easier to paint than an air blowing port manufactured by processing the through hole 43 formed in the partition plate 31 so as to reduce the air blowing resistance. is there.

  In addition, R may be formed in the surrounding part 32a so that the flow path area of the through-hole 42 may increase smoothly toward the end 42a.

  The device 32 may be attached to the underwater side surface 31b of the partition plate 31 by welding. In this case, the device 32 is welded to the underwater side surface 31 b of the partition plate 31 so that the end 42 a of the through hole 42 forms an underwater side end 41 b of the air passage 41.

(First Modification of Third Embodiment)
With reference to FIG. 7A, the partition wall 30 which concerns on the 1st modification of the 3rd Embodiment of this invention is demonstrated. The partition wall 30 according to the first modification of the third embodiment is the same as the partition wall 30 according to the third embodiment except for the points described below.

  The device 32 is attached to the underwater side surface 31b of the partition plate 31 by welding. The air passage end 42 formed in the device is the end of the air passage 41 on the underwater side. An R is formed on the edge portion 32b of the device 32 to reduce the water resistance. This reduces the water resistance of the device 32.

  In addition, instead of forming R at the edge portion 32b, a linear inclination for reducing the resistance of water may be formed.

  The manufacturing method of the resistance reduction device 20 according to this modification is the same as the manufacturing method of the resistance reduction device 20 according to the third embodiment.

(Second modification of the third embodiment)
With reference to FIG. 7B, the partition wall 30 which concerns on the 2nd modification of the 3rd Embodiment of this invention is demonstrated. The partition wall 30 according to the second modification of the third embodiment is the same as the partition wall 30 according to the third embodiment except for the points described below.

  The partition wall 30 includes a device 32 attached to the gas chamber side surface 31a of the partition plate 31 by welding and a device 32 attached to the underwater side surface 31b of the partition plate 31 by welding. Hereinafter, the device 32 attached to the gas chamber side surface 31a is referred to as the device 32 on the gas chamber 22 side, and the device 32 attached to the underwater side surface 31b is referred to as the underwater device 32. The air passage 41 includes an air passage end 42 formed in the device 32 on the gas chamber 22 side, an air passage partition plate portion 43 formed on the partition plate 31, and air formed on the device 32 on the underwater side. A passage end 42 is provided. Hereinafter, the air passage end 42 formed in the device 32 on the gas chamber 22 side is referred to as the air passage end 42 on the gas chamber 22 side, and the air passage end 42 formed on the underwater device 32 is referred to as the air passage end 42 on the underwater side device 32. The underwater side air passage end 42 is referred to. The air passage end 42 on the gas chamber 22 side is an end of the air passage 41 on the gas chamber 22 side, and is a through hole formed in the device 32 on the gas chamber 22 side. The underwater side air passage end 42 is an underwater side end of the air passage 41 and is a through hole formed in the underwater device 32. The device 32 on the gas chamber 22 side comprises a peripheral portion 32 a around the air passage end 42 on the gas chamber 22 side. The underwater side device 32 comprises a peripheral portion 32 a around the underwater side air passage end 42. Hereinafter, the peripheral portion 32a of the device 32 on the gas chamber 22 side is referred to as the peripheral portion 32a on the gas chamber 22 side, and the peripheral portion 32a of the device 32 on the underwater side is referred to as the peripheral portion 32a on the underwater side. There is a linear inclination in the peripheral portion 32a on the gas chamber 22 side so that the flow passage area of the air passage on the gas chamber 22 side increases smoothly toward the end 41a on the gas chamber 22 side of the air passage 41. Is formed. R is formed in the underwater side peripheral portion 32a so that the flow path area of the underwater side air passage increases smoothly toward the underwater side end 41b of the air passage 41. The air passage partition plate portion 43 is a through hole that penetrates the partition plate 31 from the gas chamber side surface 31a to the underwater side surface 31b. The flow path area of the air passage partition plate portion 43 is constant along the air flow direction (the thickness direction of the partition plate 31).

  A linear slope is formed in the edge portion 32b of the device 32 on the gas chamber 22 side. A linear slope is formed in the edge portion 32b of the device 32 on the underwater side to reduce the resistance of water.

  In addition, R may be formed in the peripheral portion 32a on the gas chamber 22 side so that the flow passage area of the air passage end portion 42 on the gas chamber 22 side increases smoothly toward the end 41a. A linear inclination may be formed in the peripheral portion 32a on the underwater side so that the flow area of the air passage end portion 42 on the underwater side increases smoothly toward the end 41b.

  Further, R may be formed instead of a linear inclination in one or both of the edge portion 32b of the device 32 on the gas chamber 22 side and the edge portion 32b of the device 32 on the underwater side.

  In the manufacturing method of the resistance reducing apparatus 20 according to this modification, the through hole 43 formed in the partition plate 31, the through hole 42 formed in the device 32 on the gas chamber 22 side, and the device 32 on the underwater side are formed. The device 32 on the gas chamber 22 side and the device 32 on the underwater side are welded to the partition plate 31 so that the formed through hole 42 forms the air passage 41. Here, the device 32 on the gas chamber 22 side is separated from the gas chamber side surface of the partition plate 31 so that the end 42 a of the through hole 42 formed in the device 32 on the gas chamber 22 side forms the end 41 a of the air passage 41. Weld to 31a. The underwater device 32 is welded to the underwater side surface 31 b of the partition plate 31 so that the end 42 a of the through hole 42 formed in the underwater device 32 forms the end 41 b of the air passage 41.

(Third Modification of Third Embodiment)
With reference to FIG. 7C, the partition wall 30 which concerns on the 3rd modification of the 3rd Embodiment of this invention is demonstrated. The partition wall 30 according to the third modification of the third embodiment is the same as the partition wall 30 according to the third embodiment except for the points described below.

  The partition wall 30 includes a device 32 attached to the underwater side surface 31b of the partition plate 31 by welding. The air passage 41 passes through the partition plate 31 and the device 32. The air passage 41 includes an air passage device portion 44 formed in the device 32 and an air passage partition plate portion 43 formed in the partition plate 31. The air passage device portion 44 is a through hole formed in the device 32. The air passage partition plate portion 43 is a through hole that penetrates the partition plate 31 from the gas chamber side surface 31a to the underwater side surface 31b. The air passage partition plate portion 43 includes a device side portion 43a on the device 32 side (underwater side). The air passage end 42 as the underwater side end of the air passage 41 includes an air passage device portion 44 and a device side portion 43a. The flow passage area of the air passage partition plate portion 43 is constant at the first area value along the air flow direction (the thickness direction of the partition plate 31). Therefore, the flow path area of the device side portion 43a is constant at the first area value along the air flow direction (the thickness direction of the partition plate 31). The flow path area of the air passage device portion 44 is constant at the second area value along the air flow direction. The second area value is greater than the first area value.

  Since the flow passage area of the air passage end portion 42 increases toward the underwater end 41 b of the air passage 41, the air smoothly flows out from the air passage 41 into the water.

  In the manufacturing method of the resistance reduction device 20 according to this modification, the underwater side surface of the partition plate 31 is formed such that the through hole 43 formed in the partition plate 31 and the through hole 44 formed in the device 32 form the air passage 41. The device 32 is welded to 31b. The flow passage area of the through hole 43 is constant at the first area value along the air flow direction. The flow passage area of the through hole 44 is constant at the second area value along the air flow direction. The second area value is greater than the first area value.

  In this modification, since the effect of reducing the air blowing resistance is obtained even if the center of the air passage partition plate portion 43 and the center of the air passage device portion 44 are slightly deviated, the position when welding the device 32 to the partition plate 31 is obtained. The alignment may not be so precise.

  In addition, it is preferable that the linear inclination or R for reducing the resistance of water is formed in the edge part 32b of the device 32. The device 32 may be attached to the gas chamber side surface 31a of the partition plate 31 by welding.

(Fourth modification of the third embodiment)
With reference to FIG. 7D, the partition wall 30 which concerns on the 4th modification of the 3rd Embodiment of this invention is demonstrated. The partition wall 30 according to the fourth modification example of the third embodiment is the same as the partition wall 30 according to the third modification example of the third embodiment except for the points described below.

  A plurality of outlets 40 are formed in the partition wall 30. Each of the plurality of outlets 40 includes the air passage 41 described above that penetrates the partition plate 31 and the device 32.

  In the manufacturing method of the resistance reduction device 20 according to this modification, the first through hole 43 formed in the partition plate 31 and the first through hole 44 formed in the device 32 form the first air passage 41. And the underwater side surface of the partition plate 31 so that the second through hole 43 formed in the partition plate 31 and the second through hole 44 formed in the device 32 form the second air passage 41. The device 32 is welded to 31b. The flow path area of the first through hole 43 is constant at the first area value along the air flow direction. The flow path area of the first through hole 44 is constant at the second area value along the air flow direction. The second area value is greater than the first area value. The flow passage area of the second through-hole 43 is constant at another first area value along the air flow direction. The flow path area of the second through hole 44 is constant at other second area values along the air flow direction. The other second area value is larger than the other first area value. The first area value and the other first area values may be the same or different. The second area value and the other second area values may be the same or different.

  According to this modification, only one device 32 is welded to the partition plate 31 to form a plurality of air outlets 40 that reduce the air blowing resistance. Therefore, manufacture becomes easier.

  In addition, it is preferable that the linear inclination or R for reducing the resistance of water is formed in the edge part 32b of the device 32. The device 32 may be attached to the gas chamber side surface 31a of the partition plate 31 by welding.

(Fourth embodiment)
With reference to FIG. 8A, the partition wall 30 which concerns on the 4th Embodiment of this invention is demonstrated. The partition wall 30 according to the fourth embodiment is the same as the partition wall 30 according to the first embodiment except for the points described below.

  The partition wall 30 includes a device 32 that is fitted or screwed into a through-hole 31 d formed in the partition plate 31. The through hole 31 d has a constant opening area along the thickness direction of the partition plate 31. The device 32 includes a through-hole arrangement portion 32c arranged in the through-hole 31d, and a through-hole arrangement portion 32d arranged outside the through-hole 31d. The through-hole outside arrangement part 32d is arranged on the gas chamber 22 side of the partition plate 31. When the device 32 is screwed into the through-hole 31d, a male screw is formed in the through-hole arrangement portion 32c, and a female screw is formed in the through-hole 31d. The air passage 41 is a through hole formed in the device 32. The device 32 comprises a peripheral portion 32a around the air passage end 42 as the end of the air passage 41 on the underwater side. R is formed in the peripheral portion 32a so that the flow passage area of the air passage end portion 42 increases smoothly toward the underwater side end 41b of the air passage 41. A portion of the air passage 41 other than the air passage end 42 has a constant flow path area along the air flow direction.

  With reference to FIG. 8B, the manufacturing method of the resistance reduction apparatus 20 which concerns on this embodiment is demonstrated. Initially, the device 32 is not attached to the partition plate 31. The device 32 is formed with a through hole 41 to be an air passage 41. The through hole 41 includes an end 41a arranged in the through hole outer arrangement portion 32d and an end 41b arranged in the through hole inner arrangement portion 32c. The through hole 41 includes a through hole end portion 42 on the end 41b side. The peripheral portion 32 a surrounds the through hole end portion 42. R is formed in the peripheral portion 32a so that the flow passage area of the through-hole end portion 42 increases smoothly toward the end 41b. A through hole 31 d is formed in the partition plate 31.

  The device 32 is fitted or screwed into the through hole 31d from the gas chamber 22 side so that the through hole 41 forms the air passage 41. Here, the through-hole arrangement portion 32c is fitted or screwed into the through-hole 31d until the through-hole outside arrangement portion 32d hits the gas chamber side surface 31a. Thereby, the end 41a and the end 41b of the through-hole 41 form the end 41a on the gas chamber 22 side and the end 41b on the underwater side of the air passage 41, respectively.

  According to the present embodiment, the air blowing port 40 having a small air blowing resistance is formed simply by fitting or screwing the device 32 into the through hole 31d of the partition plate 31. Manufacture is easier than when the through-hole 31d formed in the partition plate 31 is processed so that the air blowing resistance is reduced. Furthermore, the air blowing port 40 according to the present embodiment is easier to paint than an air blowing port manufactured by processing the through hole 31d formed in the partition plate 31 so as to reduce the air blowing resistance. is there.

  In the present embodiment, a linear inclination may be formed in the peripheral portion 32a instead of R. Further, the device 32 may be fitted or screwed into the through hole 31d from the underwater side. The device 32 may be welded to the partition plate 31 after the device 32 is fitted or screwed into the through hole 31d.

(First Modification of Fourth Embodiment)
With reference to FIG. 9A, the partition wall 30 which concerns on the 1st modification of the 4th Embodiment of this invention is demonstrated. The partition wall 30 according to the first modification of the fourth embodiment is the same as the partition wall 30 according to the fourth embodiment except for the points described below.

  The partition wall 30 includes a device 32 fitted or screwed into the through hole 31d formed in the partition plate 31 from the gas chamber 22 side, and a device 32 fitted or screwed into the through hole 31d from the underwater side. . Each device 32 includes a through-hole arrangement portion 32c arranged in the through-hole 31d and an out-hole arrangement portion 32d arranged outside the through-hole 31d. Hereinafter, the device 32 fitted or screwed into the through hole 31d from the gas chamber 22 side is referred to as the device 32 on the gas chamber 22 side, and the device 32 fitted or screwed into the through hole 31d from the underwater side is referred to as underwater. This is called the device 32 on the other side. The through hole outside arrangement portion 32d of the device 32 on the gas chamber 22 side is arranged on the gas chamber 22 side of the partition plate 31, and the through hole outside arrangement portion 32d of the device 32 on the underwater side is on the underwater side of the partition plate 31. Placed in. The air passage 41 communicates the inside of the gas chamber 22 with water through the two devices. The air passage 41 includes an air passage end portion 42 as an end portion on the gas chamber 22 side and an air passage end portion 42 as an end portion on the underwater side. An air passage end 42 as an end on the gas chamber 22 side is formed in the device 32 on the gas chamber 22 side, and an air passage end 42 as an end on the underwater side is formed in the device 32 on the underwater side. The The device 32 on the gas chamber 22 side comprises a peripheral portion 32 a around the air passage end 42 on the gas chamber 22 side. The peripheral portion 32a of the device 32 on the gas chamber 22 side so that the flow area of the air passage end 42 on the gas chamber 22 side increases smoothly toward the end 41a on the gas chamber 22 side of the air passage 41. A linear slope is formed on the surface. The underwater side device 32 comprises a peripheral portion 32 a around the underwater side air passage end 42. R is formed in the peripheral portion 32a of the underwater side device 32 so that the flow area of the underwater side air passage end 42 increases smoothly toward the underwater side end 41b of the air passage 41. Yes.

  With reference to FIG. 9B, the manufacturing method of the resistance reduction apparatus 20 which concerns on this modification is demonstrated. Initially, the two devices 32 are not attached to the partition plate 31. A through hole 31 d is formed in the partition plate 31.

  The device 32 on the gas chamber 22 side is formed with a through hole 42 to be the air passage end 42 on the gas chamber 22 side. The through-hole 42 includes an end 42a arranged in the through-hole outer arrangement portion 32d and an end 42b arranged in the through-hole arrangement portion 32c. The peripheral portion 32 a surrounds the through hole 42. A linear slope is formed in the peripheral portion 32a so that the flow passage area of the through hole 42 increases smoothly toward the end 42a.

  The underwater device 32 is formed with a through hole 42 to be the underwater side air passage end 42. The through-hole 42 includes an end 42a arranged in the through-hole outer arrangement portion 32d and an end 42b arranged in the through-hole arrangement portion 32c. The peripheral portion 32 a surrounds the through hole 42. R is formed in the peripheral portion 32a so that the flow passage area of the through hole 42 increases smoothly toward the end 42a.

  The two devices 32 are fitted or screwed into the through holes 31 d so that the two through holes 42 respectively formed in the two devices 32 form the air passage 41. Here, the device 32 on the gas chamber 22 side is fitted or screwed into the through hole 31d from the gas chamber 22 side. More specifically, the through-hole arrangement portion 32c of the device 32 on the gas chamber 22 side is fitted into the through-hole 31d until the outer through-hole arrangement portion 32d of the device 32 on the gas chamber 22 side hits the gas chamber side surface 31a. Or screw in. Thereby, the end 42 a of the through hole 42 of the device 32 on the gas chamber 22 side forms the end 41 a of the air passage 41 on the gas chamber 22 side. For the underwater device 32, the device 32 is fitted or screwed into the through hole 31d from the underwater side. More specifically, the through-hole arrangement portion 32c of the underwater device 32 is fitted or screwed into the through hole 31d until the through-hole outside arrangement portion 32d of the underwater device 32 hits the underwater side surface 31b. Thereby, the end 42 a of the through hole 42 of the device 32 on the underwater side forms an end 41 b on the underwater side of the air passage 41.

  R may be formed in the peripheral portion 32a of the device 32 on the gas chamber 22 side instead of the linear inclination, and the linear inclination instead of R in the peripheral portion 32a of the device 32 on the underwater side may be formed. It may be formed. The device 32 may be welded to the partition plate 31 after the device 32 is fitted or screwed into the through hole 31d.

  It is possible to add a change to each said embodiment. For example, the air passage 41 may be an elliptical hole having an elliptical cross section or a slit hole. Furthermore, it is possible to combine each said embodiment or said each modification.

DESCRIPTION OF SYMBOLS 1 ... Hull 4 ... Air supply nozzle 5 ... Outer plate 6 ... Air supply header 7 ... Slit 10 ... Hull 11 ... Bow 12 ... Stern 13 ... Ship bottom 14 ... Ship side 15 ... Outer plate 20 ... Resistance reduction device 21 ... Air supply device ( compressor)
22 ... Gas chamber 30 ... Partition wall 31 ... Partition plate 31a ... Gas chamber side surface 31b ... Underwater side surface 31c ... Peripheral portion 31d ... Through hole 32 ... Device 32a ... Peripheral portion 32b ... Edge portion 32c ... Inside through hole arrangement portion 32d ... Through Out-hole arrangement portion 40 ... Air outlet 41 ... Air passage 41a, 41b ... Air passage end 42 ... Air passage end 42a, 42b ... Device through hole end 43 ... Air passage partition plate portion 43a ... Device side portion 44 ... Air passage device portion 200 ... Air layer

Claims (17)

A gas chamber in the hull,
A partition wall that partitions the gas chamber and the water outside the hull;
An air outlet provided in the partition wall;
The air outlet includes an air passage communicating the gas chamber and the water.
The air passage includes a first air passage end on one side of the gas chamber and the water,
The ship's resistance reduction device, wherein the first air passage end is formed such that a flow passage area increases toward a first end on the one side of the air passage. The partition wall includes a partition plate that partitions the gas chamber and the water,
The air passage is formed in the partition plate,
The partition plate includes a first peripheral portion around the end of the first air passage,
The ship resistance reduction device according to claim 1, wherein an R or a linear inclination is formed in the first peripheral portion so that a flow path area of the first air passage end portion increases smoothly toward the first end. . The air passage includes a second air passage end on the other side of the gas chamber and the water,
The partition plate includes a second peripheral portion around the end of the second air passage,
The R or linear inclination is formed in the 2nd circumference part so that the channel area of the 2nd air passage end may increase smoothly toward the 2nd end of the other side of the air passage. Item 2. A ship drag reduction device according to Item 2. The partition wall is
A partition plate that partitions the gas chamber and the water;
A first device attached to the gas chamber of the partition plate and the first surface on the one side in the water;
The air passage includes an air passage partition plate portion formed in the partition plate,
The flow passage area of the air passage partition plate part is constant along the air flow direction,
The first air passage end is formed in the first device;
The first device comprises a first peripheral portion around the end of the first air passage;
The marine vessel according to claim 1, wherein R or a linear inclination is formed in the first peripheral portion so that a flow path area of the first air passage end portion increases smoothly toward the first end of the air passage. Resistance reduction device. The partition wall includes a second device attached to the partition plate and a second surface on the other side of the water,
The air passage includes a second air passage end on the other side of the gas chamber and the water,
The second air passage end is formed in the second device;
The second device comprises a second peripheral portion around the second air passage end;
The R or linear inclination is formed in the 2nd circumference part so that the channel area of the 2nd air passage end may increase smoothly toward the 2nd end of the other side of the air passage. Item 4. A ship drag reduction device according to Item 4. The one of the gas chamber and the water is the water;
The ship's resistance reduction device according to claim 4 or 5, wherein an R or a linear slope is formed at an edge portion of the first device to reduce water resistance. The partition wall is
A partition plate that partitions the gas chamber and the water;
A first device attached to the gas chamber of the partition plate and the first surface on the one side in the water;
The air passage is
An air passage partition plate portion formed on the partition plate;
An air passage device portion formed in the first device,
The flow passage area of the air passage partition plate portion is constant at the first area value along the air flow direction;
The flow path area of the air passage device portion is constant at a second area value along the air flow direction;
The air passage partition plate portion includes a device side portion on the first device side,
The first air passage end is
The device side portion;
The air passage device portion,
The ship's resistance reduction device according to claim 1, wherein the second area value is larger than the first area value. Further comprising another air outlet provided in the partition wall,
The other air outlet includes another air passage communicating the gas chamber and the water,
The other air passage includes the gas chamber and another first air passage end on the one side in the water,
The other first air passage end is formed such that the flow passage area increases toward the other first end on the one side of the other air passage,
The other air passage is
Other air passage partition plate portions formed on the partition plate;
Another air passage device portion formed in the first device,
The flow path area of the other air passage partition plate portion is constant at another first area value along the air flow direction,
The flow path area of the other air passage device portion is constant at another second area value along the air flow direction;
The other air passage partition plate portion includes another device side portion on the first device side,
The other first air passage end is:
The other device side part;
The other air passage device portion,
The resistance reduction device for a ship according to claim 7, wherein the other second area value is larger than the other first area value. The partition wall is
A partition plate that partitions the gas chamber and the water;
A device fitted or screwed into a through-hole formed in the partition plate,
The air passage is formed in the device;
The device comprises a first peripheral portion around the end of the first air passage;
The ship resistance reduction device according to claim 1, wherein an R or a linear inclination is formed in the first peripheral portion so that a flow path area of the first air passage end portion increases smoothly toward the first end. . The air passage includes a second air passage end on the other side of the gas chamber and the water,
The device is
A first device fitted or screwed into the through-hole from the one side in the gas chamber and the water;
A second device fitted or screwed into the through-hole from the other side of the gas chamber and the water,
The first air passage end is formed in the first device;
The first device comprises the first peripheral portion;
The second air passage end is formed in the second device;
The second device comprises a second peripheral portion around the second air passage end;
The R or linear inclination is formed in the 2nd circumference part so that the channel area of the 2nd air passage end may increase smoothly toward the 2nd end of the other side of the air passage. Item 9. A ship drag reduction device according to Item 9. The partition plate through hole formed in the partition plate and the first device through hole formed in the first device form an air passage that communicates the gas chamber provided in the hull and the water outside the hull. Welding the first device to the partition plate,
The partition plate partitions the gas chamber and the water,
The flow path area of the partition plate through hole is constant along the air flow direction,
The first device comprises a first peripheral portion around a first device through hole;
An R or linear slope is formed in the first peripheral portion so that the flow path area of the first device through hole smoothly increases toward the first end of the first device through hole of the first device through hole. ,
In the step of welding the first device, the first device through-hole first end forms the one end of the air passage on one side of the gas chamber and the water in the air passage. A method of manufacturing a marine resistance reduction device. A gas chamber in which a partition plate through-hole formed in the partition plate, a first device through-hole formed in the first device, and a second device through-hole formed in the second device are provided in the hull and outside the hull Welding the first device and the second device to the partition plate so as to form an air passage communicating with the water of
The partition plate partitions the gas chamber and the water,
The flow path area of the partition plate through hole is constant along the air flow direction,
The first device comprises a first peripheral portion around the first device through hole;
An R or linear slope is formed in the first peripheral portion so that the flow path area of the first device through hole smoothly increases toward the first end of the first device through hole of the first device through hole. ,
The second device comprises a second peripheral portion around the second device through hole;
An R or linear slope is formed in the second peripheral portion so that the flow path area of the second device through hole increases smoothly toward the first end of the second device through hole of the second device through hole. ,
The step of welding the first device and the second device comprises:
The first device is welded to the one side of the partition plate so that the first end of the first device through-hole forms one end of the air passage on one side of the gas chamber and the water in the air passage. And steps to
Welding the second device to the other side of the partition plate so that the first end of the second device through-hole forms the other end of the air passage on the other side of the gas chamber and the water in the air passage. A method of manufacturing a ship resistance reduction device. The one is in the water;
The manufacturing method of the ship's resistance reducing apparatus according to claim 11 or 12, wherein an R or a linear inclination for reducing the resistance of water is formed at an edge portion of the first device. The partition plate through hole formed in the partition plate and the first device through hole formed in the first device form an air passage that communicates the gas chamber provided in the hull and the water outside the hull. Welding the first device to the partition plate,
The partition plate partitions the gas chamber and the water,
The flow path area of the partition plate through hole is constant at the first area value along the air flow direction,
The flow passage area of the first device through hole is constant at the second area value along the air flow direction;
The second area value is greater than the first area value. Another partition plate through hole is formed in the partition plate,
Another first device through hole is formed in the first device,
In the step of welding the first device, the partition plate through-hole and the other first device through-hole form the partition so as to form another air passage communicating the gas chamber and the water. Welding the first device to a plate;
The flow path area of the other partition plate through hole is constant at the other first area value along the air flow direction,
The flow path area of the other first device through hole is constant at the other second area value along the air flow direction,
The method of manufacturing a ship resistance reduction device according to claim 14, wherein the other second area value is larger than the other first area value. A device through-hole formed in the device is formed on the partition plate that partitions the gas chamber and the water so as to form an air passage that communicates the gas chamber provided in the hull and the water outside the hull. A step of fitting or screwing the device into the partition plate through-hole;
The device comprises a peripheral portion around the device through hole;
R or a linear inclination is formed in the peripheral portion so that the flow passage area of the device through-hole smoothly increases toward the device through-hole first end of the device through-hole,
In the step of fitting or screwing in the device, the device through hole is formed so that the first end of the device through hole forms one end of the air passage on one side of the air chamber and the water passage. A method for manufacturing a resistance reduction device for a ship that is fitted or screwed into a ship. The first device through-hole formed in the first device and the second device through-hole formed in the second device form an air passage that communicates the gas chamber provided in the hull and the water outside the hull. And fitting or screwing the first device and the second device into a partition plate through hole formed in a partition plate that partitions the gas chamber and the water,
The first device comprises a first peripheral portion around the first device through hole;
An R or linear slope is formed in the first peripheral portion so that the flow path area of the first device through hole smoothly increases toward the first end of the first device through hole of the first device through hole. ,
The second device comprises a second peripheral portion around the second device through hole;
An R or linear slope is formed in the second peripheral portion so that the flow path area of the second device through hole increases smoothly toward the first end of the second device through hole of the second device through hole. ,
The step of fitting or screwing the first device and the second device comprises:
The first device is fitted into the partition plate through-hole from the one side so that the first end of the first device forms one end of the air passage on one side of the gas chamber and the water in the air passage. Or screwing step;
The first device is fitted into the partition plate through-hole from the other side so that the first end of the second device forms the gas chamber of the air passage and the other end of the air passage on the other side of the water. Or a step of screwing in. A method of manufacturing a ship drag reduction device.

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