JP2012071785A - Gas collection device and frictional resistance reducing type ship - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas collection device for a frictional resistance reducing type ship capable of further efficiently collecting bubbles from water mixed with the bubbles.SOLUTION: This gas collection device for the frictional resistance reducing type ship includes a gas collection chamber 51 and a partition plate 19. The gas collection chamber 51 is arranged inside a hull. The partition plate 19 has a gas collection port 41a for taking the water including gas flowing on the outside of the hull in the gas collection chamber 51, and partitions the inside and outside of the hull. The gas collection port 41a is an opening part outside of a gas flow passage 42 for communicating the inside with the outside of the hull. The gas flow passage 42 includes covering members 61 and 62 for constituting at least a bow side inner wall. The covering members 61 and 62 are formed of a plate, a bending plate or a circular pipe.

Description

  The present invention relates to a frictional resistance reduction type ship, and more particularly to a frictional resistance reduction type ship equipped with a gas recovery device.

  Ships that reduce the hull frictional resistance by covering the bottom and side surfaces of the ship with a bubbling flow during navigation (frictional resistance reduction type ships) are known. The frictional resistance reduction type ship reduces the frictional resistance of the hull by covering the bottom surface and the side surface of the ship with a bubbly flow by blowing air into the water from the bottom or the ship side near the bow. Here, if the bubbles are caught in the stern propeller, there arises a problem that propulsion efficiency is lowered or propeller vibration force is increased.

  As a technique for preventing entrainment of bubbles in a propeller, Japanese Patent Application Laid-Open No. 2009-248831 (hereinafter referred to as Patent Document 1; related published WO2009122736 (A1)) discloses a device for preventing entrainment of bubbles. The bubble entrainment prevention device includes a bubble suction port provided on the stern side of the ship bottom and a gas-liquid separation chamber. The bubble inlet sucks seawater mixed with bubbles. The gas-liquid separation chamber separates the sucked seawater into air and seawater. The separated air is released to the atmosphere.

JP 2009-248831 A

  An object of the present invention is to provide a gas recovery device having an air recovery port capable of more efficiently recovering bubbles from water in which bubbles are mixed, a frictional resistance-reducing ship having the same, and manufacture for easily manufacturing the same. Is to provide a method. Another object of the present invention is to provide a gas recovery device capable of more effectively preventing air bubbles from being caught in a stern propeller, a frictional resistance-reducing ship having the same, and easily manufacturing the same. It is to provide a manufacturing method.

  These objects and other objects and benefits of the present invention can be easily confirmed by the following description and the accompanying drawings.

  [Means for Solving the Problems] will be described below using the numbers and symbols used in [Mode for Carrying Out the Invention]. These numbers and symbols are added in parentheses to clarify the correspondence between the description of [Claims] and the mode for carrying out the invention. However, these numbers and symbols should not be used for the interpretation of the technical scope of the invention described in [Claims].

  Therefore, in order to solve the above-mentioned problem, the gas recovery device for a frictional resistance reduction type ship according to the present invention includes a gas recovery chamber (51) provided inside the hull (10) and an outside of the hull (10). It has a gas recovery port (41a) for taking water containing flowing gas into the gas recovery chamber (51), and includes a partition plate (19) that partitions the inside and the outside of the hull (10). The gas recovery port (41a) is an opening on the outside of the gas flow path (42) that communicates the inside and the outside of the hull (10). The gas flow path (42) includes at least covering members (61, 62, 70) constituting the inner wall on the bow (11) side. The covering member (61, 62, 70) is formed of a flat plate, a bent plate, or a circular tube.

  In the gas recovery apparatus for a frictional resistance reduction type ship described above, the covering members (61, 62, 70) have a surface that approaches the bow (11) side as it approaches the outside on the bow (11) side. It is preferable.

  In the gas recovery apparatus for a ship with reduced frictional resistance, the covering members (61, 62, 70) may have an inclination or R with respect to the partition plate (19) on the bow (11) side. preferable.

  In the gas recovery apparatus for a frictional resistance reduction ship described above, it is preferable that the covering members (61, 62, 70) further constitute an inner wall on the stern (12) side of the gas flow path (42).

  In the gas recovery apparatus for a ship with reduced frictional resistance, the covering members (61, 62, 70) have a distance between the bow (11) side and the stern (12) side in the gas flow path (42) so that the hull ( It is preferable that it is spread or constant from the inside to the outside of 10).

  In the gas recovery apparatus for a marine vessel with reduced frictional resistance, it is preferable to further include a box-shaped holding member (69, 79) attached on a partition plate (19) inside the hull (10). . The covering members (61, 62, 70) preferably pass through the holding members (69, 79) and are held by the holding members (69, 79).

  The frictional resistance reduced ship of the present invention includes a hull (10) and a gas recovery device (40) for a frictional resistance reduced ship. The gas recovery device (40) for a ship having a reduced frictional resistance is configured to discharge a gas blown into water from a gas blowing port (31) provided on the bottom (13) or the ship side (18) of the hull (10). It is described in any one of the above paragraphs in which the gas is recovered from the gas recovery port (41a) provided in the ship bottom (13) on the stern (12) side of the mouth (31).

  The manufacturing method of a frictional resistance reduction type ship provided with the gas recovery device of the present invention supplies water containing gas flowing outside the hull (10) to the gas recovery chamber (51) provided inside the hull (10). A gas recovery port (41a) for taking in and a gas flow path (42) communicating with the inside and outside of the hull (10) with the gas recovery port (41a) as an opening, and the inside of the hull (10) Forming a partition plate (19) for partitioning the outside and attaching a covering member (61, 62, 70) so as to cover at least the inner wall on the bow (11) side of the gas flow path (42). is doing. The covering member (61, 62, 70) is formed of a flat plate, a bent plate, or a circular tube.

  In the method of manufacturing a frictional resistance reduction type ship provided with the gas recovery device, the covering members (61, 62, 70) have a surface that approaches the bow (11) side as it approaches the outside on the bow (11) side. It is preferable.

  In the manufacturing method of the frictional resistance reduction type ship provided with the gas recovery device, the covering member (61, 62, 70) has an inclination or R with respect to the partition plate (19) on the bow (11) side. Preferably it is.

  In the gas recovery device for a frictional resistance reduction type ship described above, the step of attaching the covering member (61, 62) includes the covering member (61, 62) so as to cover the inner wall of the gas flow path (42) on the bow (11) side. ) As one of the covering members (61, 62) so as to cover the inner wall of the gas flow path (42) on the stern (12) side. And attaching the second covering member (61, 62, 70).

  In the method of manufacturing a frictional resistance reduced ship including the gas recovery device, the step of attaching the covering member (70) is a step of attaching a circular pipe as the covering member (70) along the shape of the gas flow path (42). It is preferable to provide.

  In the manufacturing method of the frictional resistance reduction type ship provided with the gas recovery device, the step of attaching the covering member (70) further includes a portion (72, 76) protruding from the partition plate (19) of the circular pipe (70). ) Is preferably removed.

  According to the present invention, it is possible to more efficiently collect bubbles from water in which bubbles are mixed. Further, it is possible to more effectively prevent bubbles from being caught in the stern propeller. Such a ship with reduced frictional resistance can be easily manufactured.

FIG. 1A is a side view showing an example of the configuration of a frictional resistance reduction ship according to an embodiment of the present invention. FIG. 1B is a bottom view showing an example of the configuration of the frictional resistance reduction ship according to the embodiment of the present invention. FIG. 2 is a plan view showing an example of the configuration of the gas recovery port provided in the frictional resistance reduction ship according to the first embodiment of the present invention. FIG. 3 is a schematic cross-sectional view showing an example of the configuration of the gas recovery chamber provided in the frictional resistance reduction ship according to the embodiment of the present invention. FIG. 4A is a cross-sectional view showing an example of the configuration of the gas recovery port and its periphery. FIG. 4B is a cross-sectional view showing an example of the configuration of the gas recovery port and its periphery. FIG. 4C is a cross-sectional view showing an example of the configuration of the gas recovery port and its periphery. FIG. 5 is a cross-sectional view showing a modification of the configuration of the gas recovery port and its periphery. FIG. 6 is a cross-sectional view showing another modification of the configuration of the gas recovery port and its periphery. FIG. 7 is a cross-sectional view showing another modification of the configuration of the gas recovery port and its periphery. FIG. 8 is a cross-sectional view showing another modification of the configuration of the gas recovery port and its periphery. FIG. 9 is a cross-sectional view showing another modification of the configuration of the gas recovery port and its periphery. FIG. 10 is a cross-sectional view showing another modification of the configuration of the gas recovery port and its periphery. FIG. 11 is a cross-sectional view showing another modification of the configuration of the gas recovery port and its periphery. FIG. 12 is a cross-sectional view showing another modification of the configuration of the gas recovery port and its periphery. FIG. 13: is a top view which shows an example of a structure of the gas collection | recovery port provided in the frictional resistance reduction type ship which concerns on the 2nd Embodiment of this invention. FIG. 14 is a cross-sectional view showing an example of the configuration of the gas recovery port and its periphery. FIG. 15 is a cross-sectional view showing a modified example of the configuration of the gas recovery port and its periphery. FIG. 16 is a cross-sectional view showing another modification of the configuration of the gas recovery port and its periphery. FIG. 17 is a cross-sectional view showing another modification of the configuration of the gas recovery port and its periphery. FIG. 18 is a cross-sectional view showing another modification of the configuration of the gas recovery port and its periphery. FIG. 19A is a plan view of a gas recovery port showing another modification of the configuration of the gas recovery port and its periphery. FIG. 19B is a plan view of the gas recovery port showing another modification of the configuration of the gas recovery port and its periphery.

  Hereinafter, a gas recovery apparatus according to an embodiment of the present invention, a frictional resistance reduction ship using the same, and a manufacturing method thereof will be described with reference to the accompanying drawings.

(First embodiment)
A gas recovery apparatus according to a first embodiment of the present invention, a frictional resistance reduction ship using the same, and a configuration thereof will be described.
FIG. 1A is a side view showing an example of the configuration of a frictional resistance reduction ship according to the first embodiment of the present invention. The frictional resistance reduction type ship includes a hull 10, a gas blowing device 30 provided in the hull 10, and a gas recovery device 40 provided in the hull 10. The hull 10 includes a bow 11, a stern 12, a ship bottom 13, a propeller 16, a rudder 17, and a ship side 18.

  The gas blowing device 30 is configured to provide gas (e.g., from air, main engine, etc.) to the underwater (e.g., in seawater) from the bottom 13 or the ship side 18 near the bow 11 so as to cover the ship bottom 13 or the ship side 18 with a bubbly flow during navigation. Exhaust gas). The gas blowing device 30 includes a gas blowing port 31 and a gas supply unit 34. The gas outlet 31 is provided in the bow 11 side part of the ship bottom 13, and blows off gas into water. However, the gas outlet 31 may be provided in a portion of the ship side 18 on the bow 11 side. The gas supply unit 34 includes a compressor or a blower and supplies gas to the gas outlet 31. The ship bottom 13 is covered with the bubble flow formed by the gas blown into the water, and the frictional resistance of the hull 10 is reduced.

  The gas recovery device 40 recovers bubbles (gas bubbles exemplified by air) from a bubble flow that flows so as to cover the ship bottom 13 and the ship side 18 during navigation. The gas recovery device 40 includes a gas recovery port 41 and a gas recovery chamber 51 as a gas recovery chamber. The gas recovery port 41 is provided in a portion of the bottom 13 on the stern 12 side, and takes in water containing bubbles from the water. The gas recovery chamber 51 has a gas-liquid separation function, and separates water containing bubbles into gas and water. The separated air is sent to the outside (in the atmosphere) through the flow channel 55 or to the gas supply unit 34 through the flow channels 55 and 56. When the gas supply unit 34 blows the gas supplied from the flow path 56 into the water from the gas blowing port 31, the energy for blowing the gas is reduced as compared with the case where the air taken in from the atmosphere is blown out.

  Here, as the gas recovery chamber 51, for example, a gas recovery chamber 51 (FIG. 3) described later or a gas-liquid separation chamber described in Japanese Patent Application Laid-Open No. 2009-248831 can be applied. The gas recovery port 41 is disposed on the stern 12 side from the gas blowing port 31 and on the bow 11 side from the propeller 16. The gas recovery port 41 is provided in a partition plate that partitions the inside and the outside of the hull 10. The partition plate is exemplified by the outer plate of the ship bottom 13. The bottom plate and the partition plate of the gas recovery chamber 51 may overlap with each other or may be separated from each other. Since the gas recovery port 41 recovers the gas on the bow 11 side from the propeller 16, bubbles are prevented from being caught in the propeller 16.

  FIG. 1B is a bottom view showing an example of the configuration of the frictional resistance reduction ship according to the first embodiment of the present invention. In this figure, the ship length direction (front-rear direction) and the ship width direction (left-right direction) of the hull 10 are indicated by X and Y, respectively. The hull 10 includes a port 14 and a starboard 15. In the example of this figure, the propeller 16 is disposed on the center line CL of the hull 10. Three gas outlets 31 are provided and are separated from each other. Three gas recovery ports 41 are provided and are separated from each other. However, the propeller 16, the gas outlet 31, and the gas recovery port 41 are examples, and the number, position, and shape thereof are not limited to this example in the present invention.

  The gas recovery port 41 is formed by a plurality of gas recovery ports, for example. Hereinafter, when a plurality of gas recovery ports are shown together, it is referred to as a gas recovery port 41, and when each gas recovery port is indicated, it is referred to as a gas recovery port 41a. The gas recovery port 41 is formed in a band shape extending in the ship width direction Y. The gas recovery port 41 on the starboard side is on the port 14 side with respect to the center line CL, and the gas recovery port 41 on the starboard side 15 is on the starboard 15 side with respect to the center line CL so that the central gas recovery port 41 straddles the center line CL. Are provided respectively. Since the gas recovery ports 41 are thus distributed over a wide range in the ship width direction Y, the gas can be recovered in a wide range in the ship width direction Y of the ship bottom 13.

  FIG. 2 is a plan view showing a configuration example of the gas recovery port 41. The gas recovery ports 41a have a rectangular slit shape, and are arranged along two parallel straight lines L1 and L2 extending in the ship width direction Y. The positions along the ship width direction Y are shifted between the slits arranged along the straight line L1 and the slits arranged along the straight line L2. The longitudinal direction of each slit is parallel to the ship width direction Y. A gas recovery chamber 51 and a flow path 55 are provided inside the hull 10 above the gas recovery port 41a.

  Next, the gas recovery apparatus 40 according to the present embodiment will be further described.

First, the configuration of the gas recovery chamber 51 of the gas recovery device 40 will be described.
FIG. 3 is a cross-sectional view (cross-sectional view in the ship width direction Y) showing an example of the configuration of the gas recovery chamber 51 used in the gas recovery apparatus 40. The gas recovery chamber 51 takes in water containing bubbles taken from the gas recovery port 41 a from the intake port 50. And the water 52 containing the bubble 52a is isolate | separated into gas and water (gas-liquid separation). The separated gas is sent out from the flow path 55 and discharged to the outside of the hull 10 or supplied to the gas supply unit 34. The separated water is discharged from the hull 10 through a valve 53 and a pump (not shown). The bottom plate 50a of the gas recovery chamber 51 may overlap with the partition plate of the ship bottom 13 or may be separated. The intake ports 50 may be gas recovery ports 41a or may be separated from each other.

Next, the structure of the gas recovery port 41a of the gas recovery device 40 and its periphery will be described.
FIG. 4A is a cross-sectional view (cross-sectional view in the ship width direction Y) showing an example of the configuration of the gas recovery port and its periphery. This figure shows the AA 'cross section of FIG. In this figure, the left side is the bow 11 side and the right side is the stern 12 side. The white arrow indicates the water flow 200, and the water flow 200 can also be regarded as the flow of the bubbles 201 from the gas outlet 31 (hereinafter the same applies in this specification).

  The partition plate 19 is exemplified as an outer plate that forms the ship bottom 13 (or the ship side 18) of the hull 10. The partition plate 19 has a gas flow path 42. The gas flow path 42 communicates the inside of the hull 10 that is one side of the partition plate 19 and the outside of the hull 10 that is the other side. The gas recovery port 41 a is an opening outside the hull 10 in the gas flow path 42. The gas recovery port 41a is a slit (FIG. 2) extending in a direction perpendicular to the drawing sheet. The longitudinal direction of the slit shown in FIG. 2 is a direction perpendicular to the drawing sheet.

  The gas passage 42 obliquely penetrates the partition plate 19 from the hull inner surface 19a to the hull outer surface 19b. The gas flow path 42 is on the bow 11 side, an inner end 42 a of the hull 10 and an outer end 42 b of the hull 10, and on the stern 12 side, an inner end 42 c of the hull 10 and an outer end 42 d of the hull 10. And have. The gas flow path 42 includes a covering member 61 that covers the inner wall on the bow 11 side. The covering member 61 constitutes a surface from the end 42a to the end 42b. That is, the covering member 61 covers the end portion 19 c on the bow 11 side of the gas flow path 42 provided in the partition plate 19. The gas flow path 42 includes a covering member 62 that covers the inner wall on the stern 12 side. The covering member 62 forms a surface from the end 42c to the end 42d. That is, the covering member 62 covers the end portion 19 d on the stern 12 side of the gas flow path 42 provided in the partition plate 19. The covering members 61 and 62 are formed of flat plates.

The side surface (the surface from the end 42 a to the end 42 b) on the bow 11 side of the gas flow path 42 approaches the bow 11 side as it approaches the outside of the hull 10. In other words, the covering member 61 gradually enters the inside of the gas recovery port 41a from the bow 11 toward the stern 12 on the side surface on the bow 11 side. In the example of this figure, the covering member 61 (the member covering the end portion 19c of the partition plate 19) has an inclination S so that it faces the bow 11 side (left side in the drawing) with respect to the direction perpendicular to the partition plate 19. Yes. As shown in the figure, the inclination S is inclined by an angle α with reference to a plane F (example: hull outer surface 19b) parallel to the partition plate 19. The angle α is preferably 2 degrees or greater and 80 degrees or less.
Further, the gas flow path 42 has a slope S ′ whose side surface on the stern 12 side (surface from the end 42 c to the end 42 d) is parallel to the slope S. In the example of this figure, the covering member 62 (a member that covers the end portion 19d of the partition plate 19) has a parallel slope S ′ that faces the slope S on the bow 11 side. The slope S ′ also has an angle α. At this time, both ends of the covering member 61 and the covering member 62 arranged in parallel are connected to each other by another covering member (parallelogram).

  As described above, the side surface on the bow 11 side of the gas flow path 42 (the surface from the end 42a to the end 42b: the covering member 61) approaches the bow 11 side as it approaches the outside of the hull 10 (example: angle). By inclining by α, it is possible to make it easier for the bubbles flowing from the gas outlet 31 on the bow 11 side to enter the gas recovery port 41a and to be taken in. Thereby, it is possible to recover the bubbles from the gas outlet 31 to the gas recovery port 41a very efficiently. In addition, as a structure in which the side surface on the bow 11 side of the gas flow path 42 approaches the bow 11 side as it approaches the outside of the hull 10, not only the slope S (the cross section is linear) but also a method of forming R (described later) Or other curved surfaces (the cross-section is not necessarily linear) (hereinafter the same in this specification).

  Water mixed with bubbles that has entered the gas recovery port 41 a is recovered in the gas recovery chamber 51 via the gas flow path 42. Here, as an example, an example is shown in which the gas flow path 42 (gas recovery port 41a) is connected to the gas recovery chamber 51 without a pipe. That is, water mixed with bubbles is recovered in the gas recovery chamber 51 through the gas recovery port 41 a and the gas flow path 42.

  However, the gas recovery chamber 51 may be connected to the gas flow path 42 (gas recovery port 41a) through a pipe. An example is shown in FIG. 4B. In FIG. 4B, the gas recovery chamber 51 is connected to the gas flow path 42 (gas recovery port 41a) via a pipe 51a. The number and shape of the pipe 51a are not particularly limited. By using the pipe 51a, the degree of freedom of arrangement of the gas recovery chamber 51 can be increased.

  Alternatively, the gas recovery chamber 51 may be connected to the gas flow path 42 (the gas recovery port 41a) via the covering members 61 and 62 extending obliquely from the partition plate 19 to the inside of the hull 10. An example of this is shown in FIG. 4C. In FIG. 4C, the covering members 61 and 62 extend further from the partition plate 19 to the inside of the hull 10 and enter deep inside the gas recovery chamber 51. In this case, since the covering members 61 and 62 are substituted for the piping in FIG. 4B, the structure of the gas recovery device 40 can be simplified. In addition, by extending the covering members 61 and 62 to the back of the gas recovery chamber 51, water mixed with bubbles can be carried to the upper side of the gas recovery chamber 51, so that the function of gas-liquid separation can be improved.

  Although not shown, only the covering member 61 may enter deeply into the gas recovery chamber 51 and the covering member 62 may extend to the entrance of the gas recovery chamber 51. In this case, water mixed with bubbles can be carried to a predetermined region of the gas recovery chamber 51, so that the function of gas-liquid separation can be improved.

  In the present embodiment, whether or not a pipe is provided between the gas flow path 42 (gas recovery port 41a) and the gas recovery chamber 51 as described above (the pattern in FIG. 4A or the pattern in FIG. 4B), Whether or not to extend the covering member into the gas recovery chamber 51 can be selected as appropriate (the pattern in FIG. 4A or the pattern in FIG. 4C). In addition, although not illustrated in the following modifications and other embodiments, whether or not a pipe is provided between the gas flow path 42 (gas recovery port 41a) and the gas recovery chamber 51, and a covering member Whether or not to extend the gas into the gas recovery chamber 51 can be selected as appropriate.

  Thus, in the structure of the gas flow path 42, the side surface on the bow 11 side approaches the bow 11 side as it approaches the outside of the hull 10. That is, it has an inclination S toward the bow 11 side. From the viewpoint of water, the gas gradually enters the gas recovery port 41a as it moves in the direction of the flow 200 (approaches the interior of the hull 10). Thus, in this Embodiment, the flow which enters the inside of the gas collection | recovery port 41a gradually can be made. Therefore, it is possible to more efficiently recover bubbles (gas) from the water in which bubbles are mixed. Thereby, it becomes possible to more effectively prevent bubbles from being caught in the stern propeller.

  Next, the manufacturing method of a frictional resistance reduction type ship provided with the gas recovery apparatus which concerns on the 1st Embodiment of this invention is demonstrated.

  First, the gas recovery port 41a and the gas flow path 42 are formed in the partition plate 19 that partitions the inner side and the outer side of the hull 10 provided on the ship bottom 13 of the hull 10 (step S1). Here, as described above, the gas recovery port 41 a is an opening provided to take water containing gas flowing outside the hull 10 into the gas recovery chamber 51 provided inside the hull 10. It has a slit shape as shown in FIG. Moreover, the gas flow path 42 uses the gas recovery port 41 a as an opening on the outside of the hull 10, and communicates the inside and the outside of the hull 10. The gas flow path 42 is inclined with respect to the surface of the partition plate 19 as shown in FIG. 4A.

  Next, the covering member 61 is attached so as to cover the inner wall of the gas passage 42 on the bow 11 side. Similarly, the covering member 62 is attached so as to cover the inner wall of the gas flow path 42 on the stern 12 side (step S2). That is, the covering members 61 and 62 are both plate-like metal members. Such a plate (covering member 61) is attached so as to cover the inclined end portion 19c of the partition plate 19. Similarly, such a plate (covering member 62) is attached so as to cover the inclined end portion 19d of the partition plate 19. The method of attaching them is exemplified by welding.

  By doing as mentioned above, the manufacturing method of a frictional resistance reduction type ship provided with a gas recovery device as shown in Drawing 1A, Drawing 1B, Drawing 2, Drawing 3, and Drawing 4A can be carried out.

  In the present embodiment, the shape of the gas flow path 42 (gas recovery port 41a) can be easily adjusted by attaching the plate-shaped covering members 61 and 62 to the opening. Thereby, the gas flow path 42 (gas recovery port 41a) can be manufactured easily. Moreover, piping to the gas collection | recovery chamber 51 can be abbreviate | omitted by extending the coating | coated members 61 and 62 above the partition plate 19 like FIG. 4C. Thereby, the structure of the gas collection | recovery apparatus 40 can be simplified, and manufacture can be made easy.

  Next, a modified example of the configuration of the gas recovery port 41a of the gas recovery device 40 and its periphery will be described.

(Modification 1 of the first embodiment)
FIG. 5 is a cross-sectional view (a cross-sectional view in which the ship width direction is the normal direction) showing Modification 1 of the configuration of the gas recovery port and its periphery.
Compared to the case of FIG. 4A, this modification is illustrated in that the side surface (surface from the end 42c to the end 42d) on the stern 12 side of the gas flow path 42 is a surface perpendicular to the partition plate 19. It is different from the case of 4A. Accordingly, the covering member 62 attached to the end 19 d of the partition plate 19 is perpendicular to the partition plate 19. Others are the same as in FIG. 4A. The manufacturing method is the same as that in FIG. 4A except that the shape of the gas flow path 42 formed in step S1 is different. Even in such a case, the same effect as in the case of FIG. 4A can be obtained.

(Modification 2 of the first embodiment)
FIG. 6 is a cross-sectional view showing another modification 2 of the configuration of the gas recovery port and its periphery.
Compared to the case of FIG. 5, the present modification is the same as the case of FIG. 5 in that the side surface (the surface from the end 42 c to the end 42 d) of the gas flow path 42 on the stern 12 side does not include the covering member 62. Is different. Therefore, the end 19 d of the partition plate 19 is exposed as a side surface of the gas flow path 42. Others are the same as in the case of FIG. The manufacturing method is the same as that in FIG. 5 except that the covering member 62 is not attached to the gas flow path 42 in step S2. In such a case, the same effect as in the case of FIG. 5 can be obtained.

(Modification 3 of the first embodiment)
FIG. 7 is a cross-sectional view showing another modification 3 of the configuration of the gas recovery port and its periphery.
Compared with the case of FIG. 4A, the present modification has a side surface (end 42a to end 42b) on the bow 11 side and a side surface (surface from the end 42c to end 42d) on the stern 12 side in the gas flow path 42. 4 is different from the case of FIG. 4A in that the curved surface is formed. The radius of R is, for example, approximately the same as the thickness of the partition plate 19. In this case, the curved surface (covering member 61) on the bow 11 side is a convex surface, and the curved surface (covering member 62) on the stern 12 side is a concave surface. The convex surface and the concave surface face each other and are parallel to each other. That is, the covering members 61 and 62 are bent plates, which are bent along the end portions 19c and 19d of the partition plate 19 on the bow 11 side and the stern 12 side, respectively. Others are the same as in FIG. 4A. The manufacturing method is the same as that in FIG. 4A except that the shape of the gas flow path 42 formed in step S1 is different and the covering members 61 and 62 attached in step S2 are bent plates. Even in such a case, the same effect as in the case of FIG. 4A can be obtained.

(Modification 4 of the first embodiment)
FIG. 8 is a cross-sectional view showing another modification 4 of the configuration of the gas recovery port and its periphery.
Compared to the case of FIG. 7, this modification is illustrated in that the stern 12 side surface (the surface from the end 42 c to the end 42 d) in the gas flow path 42 is a surface perpendicular to the partition plate 19. This is different from the case of 7. Accordingly, the covering member 62 attached to the end 19 d of the partition plate 19 is perpendicular to the partition plate 19. Others are the same as in the case of FIG. The manufacturing method is the same as that in FIG. 7 except that the shape of the gas flow path 42 formed in step S1 is different. Even in such a case, the same effect as in the case of FIG. 4A can be obtained.

(Modification 5 of the first embodiment)
FIG. 9 is a cross-sectional view showing another modification 5 of the configuration of the gas recovery port and its periphery.
Compared with the case of FIG. 8, this modification is the same as the case of FIG. 8 in that the side surface (the surface from the end 42 c to the end 42 d) of the gas flow path 42 on the stern 12 side does not include the covering member 62. Is different. Therefore, the end 19 d of the partition plate 19 is exposed as a side surface of the gas flow path 42. Others are the same as in the case of FIG. The manufacturing method is the same as that in FIG. 8 except that the covering member 62 is not attached to the gas flow path 42 in step S2. In such a case, the same effect as in the case of FIG. 8 can be obtained.

(Modification 6 of the first embodiment)
FIG. 10 is a sectional view showing another modification 6 of the configuration of the gas recovery port and its periphery.
Compared with the case of FIG. 5, the present modification is a combination of a curved surface in which the side surface (end 42 a to end 42 b) on the bow 11 side in the gas flow path 42 is formed with an R and a curved surface with an inclination S. This is different from the case of FIG. That is, the covering member 61 has an inclined portion 61a and a curved surface portion 61b. The inclined portion 61a is provided near the inside of the hull 10 (near the end 42a). The inclined portion 61a has the same inclination as the inclination S of FIG. The curved surface portion 61b is provided near the outside of the hull 10 (near the end 42b). The curved surface is convex toward the gas flow path 42. The radius of R is, for example, smaller than the thickness of the partition plate 19. Others are the same as in the case of FIG. Moreover, also about the manufacturing method, the shape of the gas flow path 42 formed in step S1 is different, and the covering member 61 attached in step S2 has an inclined portion 61a and a curved surface portion 61b, as shown in FIG. It is the same as the case of. In such a case, the same effect as in the case of FIG. 5 can be obtained.

(Modification 7 of the first embodiment)
FIG. 11 is a cross-sectional view showing another modified example 7 of the configuration of the gas recovery port and its periphery.
Compared to the case of FIG. 5, the present modified example is a combination of a curved surface in which the side surface (end 42 a to end 42 b) on the bow 11 side in the gas flow path 42 is formed with an inclination S and a curved surface with an R formed. This is different from the case of FIG. That is, the covering member 61 has a curved surface portion 61a and an inclined portion 61b. The curved surface portion 61a is provided in the vicinity outside the hull 10 (in the vicinity of the end 42a). The curved surface is concave toward the gas flow path 42. The radius of R is, for example, smaller than the thickness of the partition plate 19. The inclined portion 61b is provided in the vicinity of the inside of the hull 10 (in the vicinity of the end 42b). The inclined portion 61b has the same inclination as the inclination S in FIG. Others are the same as in the case of FIG. Moreover, also about the manufacturing method, the shape of the gas flow path 42 formed in step S1 is different, and the covering member 61 attached in step S2 has a curved surface portion 61a and an inclined portion 61b, as shown in FIG. It is the same as the case of. In such a case, the same effect as in the case of FIG. 5 can be obtained.

(Modification 8 of the first embodiment)
FIG. 12 is a cross-sectional view showing another modification 8 of the configuration of the gas recovery port and its periphery.
This modification is different from the case of FIG. 4A in that it has a holding member 69 that holds the covering members 61 and 62 as compared to the case of FIG. 4A. In this case, the covering members 61 and 62 extend obliquely further from the partition plate 19 to the inside of the hull 10 (similar to FIG. 4C, but outside the gas recovery chamber 51). The holding member 69 is attached on the partition plate 19 inside the hull 10 and has a box shape. The holding member 69 stably holds the covering members 61 and 62 at the through portions where the covering members 61 and 62 extending obliquely penetrate the holding member 69 obliquely. Others are the same as in FIG. 4A. Also, with respect to the manufacturing method, when the gas flow path 42 is formed in step S1, the holding member 69 having a penetration portion is attached to a predetermined position on the partition plate 19, and the penetration portion of the holding member 69 is covered in step S2. Except for joining the members 61 and 62 by welding or the like, it is the same as the case of FIG. 4A. Even in such a case, the same effect as in the case of FIG. 4A can be obtained.

(Second Embodiment)
A configuration of the frictional resistance reduction type ship and the gas recovery device according to the second embodiment of the present invention will be described.
1A to 1B are the same as those in the first embodiment, and thus description thereof is omitted.

  FIG. 13 is a plan view illustrating a configuration example of the gas recovery port 41. The gas recovery ports 41a have a circular hole shape and are arranged along two parallel straight lines L1 and L2 extending in the ship width direction Y. The positions of the circular holes arranged along the straight line L1 and the circular holes arranged along the straight line L2 are shifted from each other in the empty ship width direction Y. A gas recovery chamber 51 and a flow path 55 are provided inside the hull 10 above the gas recovery port 41a.

  Next, the gas recovery apparatus 40 according to the present embodiment will be further described.

  Since the configuration of the gas recovery chamber 51 of the gas recovery apparatus 40 shown in FIG. 3 is the same as that of the first embodiment, the description thereof is omitted.

Next, the structure of the gas recovery port 41a of the gas recovery device 40 and its periphery will be described.
FIG. 14 is a cross-sectional view showing an example of the configuration of the gas recovery port and its periphery. Compared with the case of FIG. 4A (first embodiment), the present embodiment is the first in that a straight circular pipe (straight pipe) is used as a covering member instead of a flat plate or a bent plate. This is different from the embodiment. This is because the gas flow path 42 has a circular hole shape as shown in FIG. In this case, as the covering member 70, a circular tube having an outer diameter substantially the same as the inner diameter of the circular hole shape is used. Since a circular pipe is used, the covering member 70 covers the entire circumference of the inner wall of the gas flow path 42. Thereby, the covering member 70 can be attached to the gas flow path 42 very easily.

  By inserting the circular pipe as the covering member 70 obliquely into the gas flow path 42, the tip 72 of the circular pipe protrudes from the hull outer surface 19 b of the partition plate 19. The tip 72 protrudes into the water flow 200 in such a way as to reach the water flow 200. By having such a shape, when water mixed with bubbles flows, the bubbles can be efficiently absorbed.

Moreover, although the shape of the gas flow path 42 is different from the slit shape and the circular hole shape and is different depending on the presence or absence of the tip 72, the cross-sectional shape of FIG. 14 can be regarded as being substantially close to the cross-sectional shape of FIG. 4A. it can. Therefore, the same effect as in the case of FIG. 4A can be obtained.
Also,

  Next, a manufacturing method of a frictional resistance reduction type ship provided with the gas recovery apparatus according to the second embodiment of the present invention will be described.

  First, the gas recovery port 41a and the gas flow path 42 are formed in the partition plate 19 that partitions the inner side and the outer side of the hull 10 provided on the ship bottom 13 of the hull 10 (step S1). Here, as described above, the gas recovery port 41 a is an opening provided to take water containing gas flowing outside the hull 10 into the gas recovery chamber 51 provided inside the hull 10. It has a circular hole shape as shown in FIG. Further, the gas flow path 42 has the gas recovery port 41 a as an opening on the outside of the hull 10, and communicates the inside and the outside of the hull 10 obliquely. That is, the gas flow path 42 is inclined with respect to the surface of the partition plate 19 as shown in FIG.

  Next, the covering member 70 is attached so as to cover the inner wall of the gas flow path 42 (step S2). That is, the covering member 70 is a straight circular metal member. Such a circular pipe (covering member 70) is cut into a predetermined length, inserted into the gas flow path 42, and attached so as to cover the inner wall of the gas flow path 42. The method of attaching them is exemplified by welding.

  By doing as mentioned above, the manufacturing method of a frictional resistance reduction type ship provided with a gas recovery device as shown in Drawing 1A, Drawing 1B, Drawing 13, Drawing 3, and Drawing 14 can be carried out.

  In the present embodiment, the shape of the gas flow path 42 (gas recovery port 41a) can be easily adjusted by attaching the plate-shaped covering member 70 to the opening. Thereby, the gas flow path 42 (gas recovery port 41a) can be manufactured easily. Further, by making the length of the circular pipe long, the piping to the gas recovery chamber 51 can be omitted as in the case of FIG. 4C. Thereby, the structure of the gas collection | recovery apparatus 40 can be simplified, and manufacture can be made easy.

  Next, a modified example of the configuration of the gas recovery port 41a of the gas recovery device 40 and its periphery will be described.

(Modification 1 of the second embodiment)
FIG. 15 is a cross-sectional view showing Modification 1 of the configuration of the gas recovery port and its periphery.
This modification is different from the case of FIG. 14 in that the front end portion 72 of the covering member 70 is removed as compared with the case of FIG. Others are the same as in the case of FIG. The manufacturing method is the same as that in FIG. 14 except that the tip 72 of the covering member 70 (circular tube) attached in step S2 is cut off before or after insertion into the gas flow path 42. In such a case, the same effect as in the case of FIG. 14 excluding the effect of the tip 72 can be obtained.

(Modification 2 of the second embodiment)
FIG. 16 is a cross-sectional view showing another modification 2 of the configuration of the gas recovery port and its periphery.
Compared with the case of FIG. 14, the present modified example is different from the first embodiment in that the covering member 73 is not a straight circular pipe (straight pipe) but a circular pipe with a gently bent tip. It is different from the form. In this case, a circular tube bent gently 90 degrees is used. Correspondingly, the gas flow path 42 is bent as shown in FIG. If such a gently bent circular pipe is used, the circular pipe is directed to the inside of the hull 10 at a predetermined angle from the partition plate 19, and then gently bent toward the stern 12 to partition the pipe. It becomes parallel to the plate 19. Therefore, when water containing bubbles enters from the gas recovery port 41a, the flow proceeds in the same direction as the flow of the ship bottom 13, so that the flow can be stabilized. Thereby, water containing bubbles can be easily drawn into the gas recovery port 41a. Others are the same as in the case of FIG. Further, the manufacturing method is the same as that of FIG. 14 except that the gas flow path 42 is shaped along the bent circular pipe in step S1 and a bent circular pipe is used as the covering member 70. Also in such a case, the same effect as in the case of FIG. 14 can be obtained.

  In addition, in FIG. 16, a circular tube that is gently bent by 90 degrees is used. For example, a portion that is gently bent is cut slightly, and the bent portion from the straight portion of the circular tube is made halfway. May be. In that case, the slope in FIG. 14 (FIG. 4A) can be formed by matching the cut surface with the surface of the hull side surface 19 d of the partition plate 19. Thereby, the effect of the inclination in FIG. 14 (FIG. 4A) can be obtained.

(Modification 3 of the second embodiment)
FIG. 17 is a cross-sectional view showing another modification 3 of the configuration of the gas recovery port and its periphery.
This modification is different from the case of FIG. 16 in that a circular tube (covering member 73) having a slightly bent portion is used in a different direction as compared with the case of FIG. At this time, in the circular tube that is gently bent 90 degrees, the portion 76 that is gently bent is slightly cut, and the bending from the straight portion is made halfway. However, when the cut surface is matched with the surface of the hull side surface 19 d of the partition plate 19, the straight portion of the circular pipe is cut and arranged so as to be perpendicular to the hull outer surface 19 d of the partition plate 19. Others are the same as in the case of FIG. The manufacturing method is the same as that in FIG. 16 except that the shape of the circular tube and the gas flow path 42 are different. Also in such a case, the same effect as in the case of FIG. 16 can be obtained except for the effect that the straight portion is parallel to the ship bottom 13.

(Modification 4 of the second embodiment)
FIG. 18 is a cross-sectional view showing another modification 4 of the configuration of the gas recovery port and its periphery.
This modification is different from the case of FIG. 15 in that it has a holding member 79 that holds the covering member 70 as compared to the case of FIG. In this case, the covering member 70 extends obliquely from the partition plate 19 to the inside of the hull 10 (similar to FIG. 4C, but outside the gas recovery chamber 51). The holding member 79 is attached on the partition plate 19 inside the hull 10 and has a box shape. The holding member 79 stably holds the covering member 70 at a through portion where the covering member 70 extending obliquely penetrates the holding member 79 obliquely. Others are the same as in the case of FIG. Also, with respect to the manufacturing method, when the gas flow path 42 is formed in step S1, the holding member 79 having a penetration portion is attached to a predetermined position on the partition plate 19, and the penetration portion of the holding member 79 is covered in step S2. Except for joining the member 70 by welding or the like, it is the same as in the case of FIG. Also in such a case, the same effect as in the case of FIG. 15 can be obtained.

(Modification 5 of the second embodiment)
19A to 19B are plan views of a gas recovery port showing another modification 5 of the configuration of the gas recovery port and its surroundings.
Compared with the case of FIG. 13, this modification differs from the case of FIG. 13 in that the gas recovery port 41 a has a long hole shape instead of a circular hole shape. In the case of FIG. 19A, the gas recovery ports 41a have a long hole shape and are arranged in the ship width direction Y. The longitudinal direction of the gas recovery port 41a is perpendicular to the ship width direction Y. In the case of FIG. 19B, the gas recovery ports 41a have a circular hole shape and are arranged along two parallel straight lines L1 and L2 extending in the ship width direction Y. The positions of the circular holes arranged along the straight line L1 and the circular holes arranged along the straight line L2 are shifted from each other in the empty ship width direction Y.

  In these cases, the circular pipe of FIG. 14 can be cut in half and used at both ends of the semicircular shape in the ship length direction in the long hole shape of FIGS. 19A and 19B. On the other hand, a flat plate can be used on the straight side surface in the ship width direction of the long hole shape. That is, compared with the case of FIG. 14, it differs from the case of FIG. 14 by using a flat tube (a pair of opposing surfaces are semicircular) instead of a circular tube. Others are the same as in the case of FIG. Further, the manufacturing method is the same as that in FIG. 14 except that the gas flow path 42 is formed in a long hole shape in step S1 and a flat tube is used as the covering member 70. Also in such a case, the same effect as in the case of FIG. 14 can be obtained.

  As described above, the inner wall (side surface) of the gas flow path 42 for gas recovery is the same as that described in each of the above embodiments and modifications thereof. It can be manufactured using a member. Thereby, manufacture becomes easy and manufacturing cost can be reduced.

  The present invention is not limited to the embodiments described above, and it is obvious that the embodiments can be appropriately modified or changed within the scope of the technical idea of the present invention. In addition, the technologies of the embodiments and the modifications thereof can be combined with each other as long as no technical contradiction occurs.

DESCRIPTION OF SYMBOLS 10 Hull 11 Bow 12 Stern 13 Ship bottom 14 Port 15 Starboard 16 Propeller 17 Rudder 18 Ship side 19 Partition 19a Hull inner surface 19b Hull outer surface 19c, 19d End part 30 Gas blower 31 Gas blower 34 Gas supply part 40 Gas supply part 40 41, 41a Gas recovery port 42 Gas flow path 42a, 42b, 42c, 42d End 42e End 50 Inlet 51 Gas recovery chamber 51a Piping 52 Water 52a Bubble 53 Valve 61, 62, 70, 73 Cover member 61a Inclined portion 61b Curved surface Part 200 Flow 201 Bubble

Claims (13)

A gas recovery chamber provided inside the hull;
A gas recovery port for taking water containing gas flowing outside the hull into the gas recovery chamber, and a partition plate for partitioning the inner side and the outer side of the hull;
The gas recovery port is an opening on the outside of a gas flow path that communicates the inside and the outside of the hull.
The gas flow path includes a covering member that forms at least a bow-side inner wall,
The covering member is formed of a flat plate, a bent plate, or a circular pipe. In the gas recovery device for a frictional resistance reduction type ship according to claim 1,
The said covering member has a surface which approaches the said bow side as it approaches the said outer side in the said bow side. Friction resistance reduction type gas recovery apparatus for ships. In the gas recovery device for a frictional resistance reduction type ship according to claim 2,
The covering member has an inclination or R with respect to the partition plate on the bow side. In the gas recovery device for a frictional resistance reduction type ship according to claim 2 or 3,
The covering member further constitutes the inner wall on the stern side of the gas flow path. In the gas recovery device for a frictional resistance reduced type ship according to claim 4,
The covering member is
A frictional resistance-reducing type gas recovery apparatus for a ship with reduced frictional resistance, wherein the distance between the bow side and the stern side in the gas flow passage increases or is constant from the inner side toward the outer side of the hull. In the gas recovery device for a frictional resistance reduced ship according to claim 4 or 5,
Further comprising a box-shaped holding member mounted on the partition plate inside the hull,
The said covering member penetrates the said holding member, and is hold | maintained at the said holding member. Friction resistance reduction type | mold gas recovery apparatus for ships. The hull,
The gas blown into water from a gas blowout port provided on the ship bottom or ship side of the hull is recovered from a gas recovery port provided on the ship bottom on the stern side of the gas blowout port. A frictional resistance-reducing ship comprising the gas-recovery device for a frictional resistance-reducing ship according to claim 1. A gas recovery port for taking water containing gas flowing outside the hull into a gas recovery chamber provided inside the hull; and the gas recovery port as an opening, the inner side and the outer side of the hull, Forming a gas flow path communicating with a partition plate that partitions the inner side and the outer side of the hull;
Attaching a covering member so as to cover at least the inner wall on the bow side of the gas flow path,
The said covering member is formed with the flat plate, the curved board, or the circular pipe. The manufacturing method of a frictional resistance reduction type | mold ship provided with the gas recovery apparatus. In the manufacturing method of a frictional resistance reduction type ship provided with the gas recovery device according to claim 8,
The said covering member has a surface which approaches the said bow side as it approaches the said outer side in the said bow side. The manufacturing method of a frictional resistance reduction type | mold ship provided with a gas recovery apparatus. In the manufacturing method of a frictional resistance reduction type ship provided with the gas recovery device according to claim 9.
The said covering member has the inclination or R with respect to the said partition plate in the said bow side The manufacturing method of a frictional resistance reduction type | mold ship provided with the gas collection | recovery apparatus. In the gas recovery apparatus for a frictional resistance reduced ship according to claim 9 or 10,
The step of attaching the covering member includes
Attaching a first covering member as one of the covering members so as to cover the inner wall on the bow side of the gas flow path;
Attaching a second covering member as another one of the covering members so as to cover the inner wall on the stern side of the gas flow path. A method for manufacturing a frictional resistance reduction type ship including a gas recovery device. In the manufacturing method of a frictional resistance reduction type ship provided with the gas recovery device according to claim 9 or 10,
The step of attaching the covering member includes
A method of manufacturing a frictional resistance reduction type ship provided with a gas recovery device comprising a step of attaching a circular pipe as the covering member along the shape of the gas flow path. In the manufacturing method of a frictional resistance reduction type ship provided with the gas recovery device according to claim 12,
The step of attaching the covering member further includes:
The manufacturing method of a frictional resistance reduction type | mold ship provided with the process of removing the part which protruded from the said partition plate among the said circular pipes.

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