JP2008143489A - Duct for ship, method of manufacturing duct for ship and ship with duct for ship - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easily manufacturable duct for a ship, while maintaining performance as an energy-saving device, a manufacturing method of the dust for the ship, and the ship with the duct for the ship for arranging the duct for the ship. <P>SOLUTION: This duct 4 for the ship has a duct outside plate 10 having a diameter larger on a bow side than a stern side and being a part of a cone longer on an upper side than the lower side, a cylindrical stern side inner plate 20 stored in the duct outside plate 10 and longer on the upper side than the lower side, and a bow side inner plate 30 stored in the duct outside plate 10. The stern side edge 12 of the duct outside plate 10 and the stern side edge 22 of the stern side inner plate 20 are connected. The bow side edge 11 of the duct outside plate 10 and the bow side edge 31 of the bow side inner plate 30 are connected. The stern side edge 32 of the bow side inner plate 30 and the bow side edge 21 of the stern side inner plate 20 are also connected. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a marine duct installed at the stern of a marine vessel, a method for manufacturing the marine duct, and a marine vessel with a marine duct in which the marine duct is installed.

  In a ship, a device that collects energy lost when the hull moves forward and obtains an energy-saving effect is a kind of energy-saving device, a cylindrical device (called a duct or nozzle) installed in front of the propeller. (For example, see Patent Documents 1 and 2).

Utility Model Registration Gazette No. 2555130 (2 pages, Fig. 1) JP 11-278383 A (page 2-3, FIG. 2)

However, the device disclosed in Patent Document 1 is provided by providing a ring-shaped nozzle of a prescribed shape (same as a ship duct, hereinafter referred to as a “ship duct”) between the stern of the hull and the propeller. Although the hull efficiency and propulsion efficiency can be improved, the shape of the cross section including the shaft center of the ship duct (hereinafter referred to as “cross-sectional shape”) is hydrodynamically streamlined as typified by an airfoil. Because of its shape, it is a three-dimensionally complicated curved surface. In particular, the front edge of the duct (the bow side edge) has a bent portion with a large curvature (same as a small radius of curvature) in the cross section including the shaft center, and also has a circular arc shape in the cross section perpendicular to the shaft center. It is bent. For this reason,
(A) The press working with a relatively simple working process is difficult to use for processing with a large local curvature, and cannot be used for manufacturing the leading edge of a marine duct.
(Ii) Since castings need to be manufactured and bonded together with many small patch-like surfaces, there is a problem that the man-hours increase significantly and the material cost itself increases.
(Iii) “Linear heating”, in which bending is performed while applying heat, requires skilled processing skills and has a problem that the number of processing steps increases significantly compared to breath processing, and craftsmen with skilled processing skills Therefore, there is a problem that it may not be a processing method in the future.
Moreover, the invention disclosed in Patent Document 2 is to form an extremely thick steel plate into an annular shape by press working and shape its cross-sectional shape into a wing shape by machining. For this reason,
(E) Since the cost of machining was high, there was a problem that the manufacturing cost would rise.
(O) In addition, since the machines that enable such machining are limited to specific machines, the number of factories that can be manufactured is limited. .

  The present invention has been made in view of the above, and is provided with a marine duct that can be simply manufactured while maintaining the performance as an energy saving device, a marine duct manufacturing method, and the marine duct. The ship with a ship duct is provided.

(1) A marine duct according to the present invention includes a duct outer plate whose bow side is a part of a cone having a larger diameter than the stern side,
A stern side inner plate that is a part of a cylinder connected to a stern side edge of the duct outer plate in a state of being accommodated in the duct outer plate;
A bow side inner plate that smoothly connects the bow side edge of the duct outer plate and the bow side edge of the stern side inner plate in a state of being accommodated in the duct outer plate;
Have
(2) In the above (1), the upper side of the duct outer plate is longer than the lower side, and the upper side of the stern side inner plate is longer than the lower side.

(3) In the above (1) or (2), the stern side inner plate is a part of a cylinder.
(4) In any one of the above (1) to (3), the shape of the cross section including the central axis of the bow side inner plate is a single arc or a plurality of continuous arcs.
(5) In any one of (1) to (4), a pipe or a bar is installed along the bow side edge of the duct outer plate,
A bow side edge of the bow side inner plate is connected to the pipe or bar.

(6) Moreover, the ship with a ship duct according to the present invention includes a hull,
A propeller installed protruding from the stern of the hull;
The marine duct according to any one of (1) to (5) installed at the stern of the hull;
Have

(7) Further, the ship duct manufacturing method according to the present invention includes a duct outer plate whose bow side is larger in diameter than the stern side and whose upper side is a part of a cone longer than the lower side,
A tubular stern side inner plate that is connected to the stern side edge of the duct outer plate in a state accommodated in the duct outer plate, and whose upper side is longer than the lower side,
A bow side inner plate that smoothly connects the bow side edge of the duct outer plate and the bow side edge of the stern side inner plate in a state of being accommodated in the duct outer plate;
A method for manufacturing a marine duct installed at a stern portion of a hull, comprising:
A step of manufacturing the duct outer plate by forming a duct outer plate original plate that is substantially fan-shaped so that the distance between the outer peripheral edge and the inner peripheral edge approaches one side edge to form a part of a cone; and ,
A stern side inner plate is manufactured by forming a stern side inner plate, which is substantially trapezoidal so that one hypotenuse is perpendicular to the base and the other hypotenuse is closer to the upper side so as to form a part of a cylinder. Process,
Connecting the stern side edge of the stern side inner plate to the stern side edge of the duct outer plate in a state accommodated in the duct outer plate; and
A plurality of substantially fan-shaped divided inner plates for bow side inner plates whose distance between the outer peripheral edge and the inner peripheral edge varies are formed in a circular arc shape in cross section, and the respective side edges are joined to produce the bow side inner plate. Connecting the bow side edge of the bow side inner plate to the bow side edge of the duct outer plate, and connecting the stern side edge of the bow side inner plate to the bow side edge of the stern side inner plate. Completing the marine duct,
Have

(8) In the above (7), the method includes a step of installing a tube or a rod along the bow side edge of the duct outer plate,
Instead of connecting the bow side edge portion of the bow side inner plate to the bow side edge portion of the duct outer plate, connecting the bow side edge portion of the bow side inner plate to the tube body or rod body. Features.

(9) Further, in the method for manufacturing a marine duct according to the present invention, a duct outer plate in which the bow side is larger in diameter than the stern side and the upper side is a part of a cone longer than the lower side;
A tubular stern side inner plate that is connected to the stern side edge of the duct outer plate in a state accommodated in the duct outer plate, and whose upper side is longer than the lower side,
A bow side inner plate that smoothly connects the bow side edge of the duct outer plate and the bow side edge of the stern side inner plate in a state of being accommodated in the duct outer plate;
A method for manufacturing a marine duct installed at a stern portion of a hull, comprising:
A step of manufacturing the duct outer plate by forming a duct outer plate original plate that is substantially fan-shaped so that the distance between the outer peripheral edge and the inner peripheral edge approaches one side edge to form a part of a cone; and ,
A stern side inner plate is manufactured by forming a stern side inner plate, which is substantially trapezoidal so that one hypotenuse is perpendicular to the base and the other hypotenuse is closer to the upper side so as to form a part of a cylinder. Process,
Connecting the stern side edge of the stern side inner plate to the stern side edge of the duct outer plate in a state accommodated in the duct outer plate; and
Forming a plurality of bow-side inner plate-shaped divided original plates each having a substantially circular arc shape in which the distance between the outer peripheral edge and the inner peripheral edge varies;
The bow side edge of the bow side inner plate split original plate formed in the cross-section arc shape is connected to the bow side edge of the duct outer plate, and the stern side edge of the bow side inner plate split original plate is the stern Connecting to the bow side edge of the side inner plate,
Joining the split original plates for the bow side inner plate connected to the bow side edge of the duct outer plate and the bow side edge of the stern side inner plate to complete the ship duct;
Have

(10) In the above (9), the method includes a step of installing a tube or a rod along the bow side edge of the duct outer plate,
In place of connecting the bow side edge of the split original plate for bow side inner plate formed in the cross-section arc shape to the bow side edge of the duct outer plate,
The bow side edge part of the division | segmentation original plate for bow side inner boards formed in the said circular arc shape is connected to the said pipe or a rod.

(I) Therefore, according to the present invention, the outside of the marine duct is formed by a duct outer plate that is a part of a cone, and the inner side of the bow side of the marine duct is formed by a bow side inner plate having a predetermined curved surface. Therefore, there is no curved surface outside the bow side of the marine duct. For this reason, manufacture of the bow side part of a ship duct becomes easy, and it can aim at reduction of the manufacturing cost of a ship duct, and shortening of a construction period.
(Ii) Furthermore, since the duct outer plate and the stern side inner plate are longer on the upper side than the lower side in a side view, the degree of freedom of design corresponding to the stern shape increases, and the energy saving effect increases.

(Iii) Since the stern side inner plate is a part of a cylinder, it can be manufactured by two-dimensional bending of the plate material, and the manufacturing cost of the marine duct can be further reduced and the construction period can be further reduced. .
(Iv) In addition, since the shape of the cross section including the central axis of the bow side inner plate is a single arc or a plurality of continuous arcs, the formation is relatively easy, and the manufacturing cost is reduced.
(V) Since the pipe or bar is installed along the bow side edge of the duct outer plate, and the bow side edge of the bow side inner plate is connected to the pipe or bar, Since a bending process with a large curvature at the bow side edge portion (the same as when the curvature radius is small) is not required, the manufacturing is facilitated, and further reduction in manufacturing cost of the marine duct and further shortening of the construction period are promoted.

  (Vi) Furthermore, according to the present invention, since the marine duct according to any one of (1) to (5) is installed, the manufacturing cost can be reduced and the propulsion performance can be improved.

(Vii) Further, according to the present invention, the duct outer plate original plate is formed so as to form a part of a cone, and the duct outer plate is formed, and the stern side inner plate original plate is formed so as to form a part of a cylinder. The stern side inner plate and the duct outer plate are connected to each other, and a plurality of divided inner plates for the bow side inner plate are formed in an arc shape in cross section, and the side edges are joined to each other. In order to manufacture marine ducts by connecting to the bow side edge and the bow side edge of the stern side inner plate, mainly the two-dimensional bending process (especially the curvature at the bow side edge is large (the radius of curvature is Because the bow side edge part of the marine duct can be formed by the same) (the bending process is not required), the production becomes easy, the production cost of the marine duct can be reduced, and the construction period can be shortened. .
In addition, the distance between the outer peripheral edge and the inner peripheral edge of the duct outer plate original board that is a fan-shaped with a constant distance between the outer peripheral edge and the inner peripheral edge; A duct outer plate that is a part of a cone having the same upper and lower lengths, and a cylinder that has the same upper and lower lengths, by using a plurality of constant fan-shaped divided original plates for inner plates on the bow side A ship duct having a stern side inner plate that is a part of the ship duct can be manufactured. Therefore, a method for manufacturing such a ship duct (trapezoid in a side view) is the above-described ship duct (a rectangle whose opposite sides are not parallel in a side view). ) Is equivalent to the manufacturing method.
(Viii) Also, in order to install a tube or rod along the bow side edge of the duct skin,
Since there is no need to bend a large curvature (same as a small curvature radius) at the bow side edge of the split inner plate for the inner plate on the bow side, the manufacturing becomes easier, further reducing the manufacturing cost of the ship duct and Further shortening is promoted.

(Ix) Furthermore, according to the present invention, together with the effect (vii),
Without connecting the bow inner plate as a single unit, the split inner plate for the bow inner plate, which has a circular arc cross section, is connected to the duct outer plate and the stern inner plate. Since it becomes easy, the manufacturing cost of the ship duct can be reduced and the construction period can be shortened.
(X) In order to install a tube or rod along the bow side edge of the duct skin,
Since there is no need to bend a large curvature (same as a small curvature radius) at the bow side edge of the split inner plate for the inner plate on the bow side, the manufacturing becomes easier, further reducing the manufacturing cost of the ship duct and Further shortening is promoted.

[Embodiment 1: Ship with ship duct]
FIG. 1 is a partial side view showing an outline of a ship with a ship duct according to Embodiment 1 of the present invention. In FIG. 1, a ship with a ship duct 1 includes a hull 2, a propeller 3 that protrudes from the stern (right side in the figure) of the hull 2, a ship duct 4 that is installed at the stern of the hull 2, have.
The ship ducts 4 are installed on both ship sides of the hull 2 and are formed by line segments each connecting a position A, a position B, a position D, and a position C in the side view (same as the direction of viewing the ship side). In a front view (same as the direction of looking at the stern), it is a substantially semicircle (not shown). The marine duct 4 installed on the starboard and the marine duct 4 installed on the port side are symmetrical with each other and are in a range close to the bridge (upper side in the figure) and away from the hull 2 ( In the drawing, the range of the line segment SC) is connected to each other. In addition, the center axis | shaft of the propeller 3 is shown with the dashed-dotted line 3c, and the example of the water surface is shown with the continuous line 1c.

When the diameter of the propeller 3 is “P”, the stern side diameter D1 of the ship duct 4 (position C—the distance of the position D, see FIG. 5), the upper length M1 of the ship duct 4 (the length of the line segment AC) 5), the lower length N1 of the marine duct 4 (the length of the line segment BD, see FIG. 5), and the ratio θ of the marine duct 4 that expands in the bow direction (in the figure, the line segment) The angle formed between AC and the central axis 8, the angle formed between the line segment BD and the central axis 8 (see FIG. 5) is constant in the circumferential direction, and is in the following range. 0.40 × P <D1 <1.0 × P
0.40 × P <M1 <1.0 × P
0.02 × P <N1 <1.0 × P
N1 ≦ M1
5 ° <θ <20 °

[Embodiment 2: Duct for ships-Part 1]
FIG. 2 is a side view showing an outline of a marine duct according to Embodiment 2 of the present invention. In FIG. 2, the ship duct 4 is installed on the starboard side of the ship 1 with the ship duct shown in FIG.
The ship duct 4 is a duct whose bow side is larger in diameter than the stern side and whose upper side (corresponding to the bridge side or water surface side) is a part of a cone longer than the lower side (corresponding to the ship bottom side or the sea bottom side). An outer plate 10, a tubular stern side inner plate 20 which is accommodated in the duct outer plate 10 and whose upper side is longer than the lower side, and a bow side inner plate 30 which is accommodated in the duct outer plate 10. Have.
Then, the stern side edge portion 12 (arc connecting the position C and the position D) of the duct outer plate 10 and the stern side edge portion 22 (arc connecting the position G and the position H) of the stern side inner plate 20 are connected. A bow side edge portion 11 (an arc connecting position A and position B) of the outer plate 10 and a bow side edge portion 31 (an arc connecting position J and position K) of the bow side inner plate 30 are connected to each other. The stern side edge portion 32 (arc connecting the position L and the position M) of the inner plate 30 and the bow side edge portion 21 (arc connecting the position E and the position F) of the stern side inner plate 20 are connected.

  FIG. 3 is a schematic diagram illustrating a cross-sectional shape of the marine duct shown in FIG. Since the shape (referred to as “cross-sectional shape”) of the surface including the axis of the marine duct 4 is similar in the circumferential direction (not strictly geometrically similar), the marine duct 4 has a duct outer plate 10 and a stern side inner plate 20 having a straight cross section, and a bow side inner plate 30 having a curved cross section. That is, since the cross section of the marine duct 4 has only a three-dimensional curve only on the bow side inner plate 30, the production is much easier than the conventional airfoil and the production cost is low. It has become.

In FIG. 3, regarding the cross section at a predetermined position in the circumferential direction, the length of the ridge line 13 of the duct outer plate 10 (part of the cone) is “L1”, and the length of the ridge line 23 of the stern side inner plate 20 (part of the cylinder). If the length is “L2” and the angle between the ridge line 13 and the ridge line 23 is “θ”,
L1>L2> 0.3 × L1
20 °>θ> 0 °
Are in a relationship.

Further, the ridgeline 33 of the bow side inner plate 30 is smoothly curved three-dimensionally, and a single arc, a plurality of arcs are smoothly continuous, or an analysis curve (for example, a sine curve, an involute, etc.) ) And a free curve. In addition, the bow side inner board 30 is manufactured by mutually connecting the division | segmentation original plates shape | molded by the predetermined shape (this is demonstrated in detail separately).
In addition, although the above has shown the case where the stern side inner plate 20 is a part of a cylinder, the stern side inner plate 20 is formed in a morning glory shape having a small curvature (the same as a trumpet shape having a large curvature radius). Since the large range of curvature is limited to the bow side inner plate 30, the manufacturing is greatly facilitated as described above, and the manufacturing cost is reduced. Moreover, although the duct outer plate | board 10 has shown the thing whose upper side is longer than lower side, the length of the upper side and lower side may be equal.

[Embodiment 3: Duct for ships-Part 2]
FIG. 4 is a side view showing an outline of a marine duct according to Embodiment 3 of the present invention. In FIG. 3, the marine duct 5 has a tube body 40 installed along the bow side edge portion 11 of the duct outer plate 10, and the bow side edge portion 31 of the bow side inner plate 30 is joined to the tube body 40. Yes. That is, it is different from the marine vessel duct 4 shown in the second embodiment (FIG. 2) in that it has the tubular body 40, and other points are the same as the marine vessel duct 4. The same parts as those in the second embodiment are denoted by the same reference numerals, and a part of the description is omitted.
Accordingly, the marine duct 5 exhibits the effects of the marine duct 4 and the joining of the duct outer plate 10 and the bow side inner plate 30 is facilitated, and the curvature of the bow side edge 31 of the bow side inner plate 30 is improved. Since large processing can be omitted, the bow inner plate 30 can be easily manufactured. Furthermore, since the tubular body 40 is located at the joint between the duct outer plate 10 and the bow side inner plate 30, rigidity and durability are improved. In addition, even if it replaces with the tubular body 40 and a rod is installed, the same effect can be show | played.

(Energy saving effect)
Next, the energy-saving effect of the marine duct 5 and the conventional marine duct (same as the duct-type energy-saving device) when the streamlined airfoil (NACA4415) is used for the duct surface shape with the same dimensions as the marine duct 5 A comparison of is shown. The comparison was carried out using a model ship having a total length of 8 m and a hull test water soda having a length of 240 m, a width of 18 m, and a depth of 8 m. The model ship is a large ore carrier.
FIG. 5 is a schematic diagram for explaining a marine duct used for comparison of the energy saving effect of the present invention, in which (a) is a side view shape of the marine duct 5 and (b) is a cross-sectional shape of the marine duct 5. (C) is a cross-sectional shape of a conventional marine duct. The same parts as those in the first embodiment are denoted by the same reference numerals, and a part of the description is omitted.
The specifications of the marine duct 5 used for comparison are as follows.
P = 240mm
D1 = 0.6 × P
M1 = 0.557 × P
N1 = 0.073 × P
L2 = 0.6 × L1 (however, M1 ≧ L ≧ N1)
θ = 10.0 °

Table 1 shows the comparison results. In other words, when the horsepower in the full load state when the marine duct (same as the energy saving device) is not set to 100, when the conventional marine duct is installed, the horsepower is 95.4, and the marine duct 5 of the present invention is When installed, the horsepower is reduced to 93.5. Therefore, it can be seen that when the marine duct 5 of the present invention is installed, it is about 1.9% smaller than when a conventional marine duct is installed.
From this, it can be seen that the marine vessel duct 5 of the present invention having a straight ridge line has the same or equivalent energy saving effect as compared with the conventional marine vessel duct having a wing-shaped cross section.

FIG. 6 is a schematic diagram for explaining the energy saving effect of the marine duct according to the third embodiment of the present invention. In FIG. 6, the marine duct 5 captures the flow flowing in at an angle of attack, thereby generating an obliquely forward lift Q in the marine duct 5 and recovering its forward component as thrust R, thereby reducing horsepower. It has been promoted and has an energy saving effect.
Specifically, the thrust R appears in the form of a decrease in viscous pressure resistance and an increase in the thrust reduction coefficient. Moreover, the effect | action which the duct 5 for ships has with respect to a flow contributes to horsepower reduction in the form of a wake gain. Therefore, in order to increase the contribution by thrust, it is necessary to adopt a cross-sectional shape with a large lift-drag ratio. In other words, the resistance (drag) of itself is small, and a large cross section with a high lift Q (the forward component becomes the thrust R) is good.

FIG. 7 shows CFD simulation results comparing the lift-drag ratio, where the vertical axis represents the lift-drag ratio and the horizontal axis represents the angle of attack. That is, with a Reynolds number of 2.8 × 10 ⁷ when mounted on an actual ship, a CFD simulation (finite volume method: turbulence model k-ωmodel) is performed for the conventional ship duct (NACA4415) and the ship duct 5 of the present invention. ).
From FIG. 7, it can be seen that the lift-drag ratio of the marine duct 5 of the present invention is larger than that of the conventional marine duct in the most region where the angle of attack is 5.0 ° or more. As a result, a large thrust R that contributes to resistance reduction can be generated. That is, it is shown that an excellent energy saving effect is possible even in the marine duct 5 of the present invention using a substantially straight ridgeline.

[Embodiment 4: Manufacturing Method of Ship Duct-Part 1]
FIG. 8 is a schematic diagram for explaining a method for manufacturing a marine duct according to Embodiment 4 of the present invention. FIG. 8 shows a case where an annular ship duct 6 is manufactured by joining semicircular ship ducts 4 to each other in a pair of front views for easy understanding. The semicircular marine vessel ducts 4 are respectively installed on both sides of the hull 2, and an approximate ring having a part of the hull 2 is formed on the way.
The manufacturing method of the ship duct 6 is as follows:
(A) A duct outer plate original plate having a substantially fan shape that increases as the distance between the outer peripheral edge 11 and the inner peripheral edge 12 approaches one side edge is formed so as to form a part of a cone, thereby forming the duct outer plate 10a. 10b, and joining both into an annular shape (see (a) of FIG. 8);
(B) A stern side inner plate original plate having a substantially trapezoidal shape that increases as one hypotenuse 22 is perpendicular to the base and the other hypotenuse 21 approaches the upper side, is formed so as to form a part of a cylinder. Manufacturing the inner plates 20a and 20b and joining them into an annular shape (see FIG. 8B);
(C) A plurality of bow-side inner-plate divided original plates 301a, 302b,... In which the distance between the outer peripheral edge 31 and the inner peripheral edge 32 fluctuates are formed in a circular arc shape in cross section, and the side edges are formed. Joining to produce the bow side inner plate 30a, similarly producing the bow side inner plate 30b, joining the two into an annular shape (see (c) of FIG. 8),
(D) In the state accommodated in the duct outer plate 10 manufactured in an annular shape, the stern side edge 22 of the stern side inner plate 20 is connected to the stern side edge 12 of the duct outer plate 10,
The bow side edge 31 of the bow side inner plate 30 is connected to the bow side edge 11 of the duct outer plate 10, and the stern side edge 32 of the bow side inner plate 30 is connected to the bow side edge 21 of the stern side inner plate 20. Connecting (see FIG. 8D).

Therefore, since the marine duct 6 is manufactured by manufacturing the three blocks and then joining them, the manufacturing is simplified and the manufacturing cost is reduced.
That is, since the duct outer plates 10a and 10b are formed by bending a flat plate having a predetermined shape into a conical shape, complicated three-dimensional processing is not required, and man-hours are reduced by half. In particular, in the past, it has been necessary to form a curved surface having a large three-dimensional curvature at the bow side edge, so that when bending is performed, a skilled worker is required and man-hours are increased or machining is required. When doing so, specific equipment was required and the processing cost was soaring.
In addition, since the stern side inner plates 20a and 20b are cylindrical, complicated three-dimensional processing is not required as with the duct outer plates 10a and 10b.

In manufacturing the bow side inner plates 30a and 30b, complicated three-dimensional processing is required as in the conventional case. However, the range requiring complicated three-dimensional processing is limited to the bow side edge portions 31a and 31b of the bow side inner plates 30a and 30b, and other ranges (the duct outer plates 10a and 10b, and the stern side inner plate 20a). 20b) is a two-dimensional shape and is easy to mold, so that the manufacturing cost is greatly reduced.
Usually, in the manufacture of marine ducts, the number of man-hours of the highly heated linear heating portion at the tip occupies approximately ** (described at the time of filing) **% of the total man-hours. In the present invention, since the linear heating portion can be halved, the conventional processing man-hour is simply reduced by approximately ** (described at the time of filing) **%.
Moreover, since the part which can employ | adopt easy methods, such as roller bending and a simple press process, increases the part for the part which has the linear ridgeline of an inner and outer surface further. As the number of man-hours decreases, the work period can be shortened and the manufacturing cost can be reduced.

The above manufactures the semicircular duct outer plates 10a and 10b and the stern side inner plates 20a and 20b in front view from one original plate, but the present invention is not limited to this. It is also possible to divide the original plate into a plurality of pieces and use the divided original plate to be joined to each other after bending the divided original plate. Alternatively, a wide original plate may be used, and the wide original plate may be formed into an annular shape. Further, the numbers of the split inner plates 301a, 302b,... For manufacturing the bow side inner plate 30a (the same applies to the bow side inner plate 30b) are not limited. (Angle) need not be constant.
In addition, the duct outer plate original plate having a fan-shaped distance between the outer peripheral edge and the inner peripheral edge, the stern side inner plate original plate having a trapezoidal shape in which the upper side and the bottom side are parallel, and the distance between the outer peripheral edge and the inner peripheral edge are A duct outer plate that is a part of a cone having the same upper and lower lengths, and a cylinder that has the same upper and lower lengths, by using a plurality of constant fan-shaped divided original plates for inner plates on the bow side A ship duct having a stern side inner plate, which is a part of the stern side, can be manufactured. Accordingly, the ship duct (trapezoid in the side view) is manufactured by the ship duct (side view in the side view) of the present invention. Non-parallel rectangles) are included in the manufacturing method.

[Embodiment 5: Manufacturing Method of Ship Duct-Part 2]
In the method for manufacturing a marine duct according to the fourth embodiment of the present invention shown in FIG. 8, the bow side inner plates 30a and 30b are manufactured and formed into an annular shape, and then joined to the annular duct outer plates 10a and 10b. However, the present invention is not limited to this, and after the annular stern side inner plates 20a and 20b are joined to the annular duct outer plates 10a and 10b, the bows formed in the cross-section arc shape respectively. The side inner plate split original plates 301a, 302b,... Are joined to the annular duct outer plates 10a, 10b, and the like. That is, the process of manufacturing the bow side inner plates 30a, 30b once in an annular shape is saved (not shown).

[Embodiment 6: Manufacturing method of marine duct-Part 3]
FIG. 9 is a schematic diagram for explaining a method for manufacturing a marine duct according to Embodiment 6 of the present invention. In FIG. 9, the manufacturing method of the marine duct 7 is such that after the divided ducts 710, 720, 730 are manufactured, these are joined to complete the marine duct 7.
(A) A duct split outer plate 711 is manufactured by forming the split outer plate for duct outer plate so as to form a part of a cone,
(B) A stern side divided inner plate 712 is manufactured by forming the stern side inner plate divided original plate so as to form a part of a cylinder,
(C) Each of the bow side inner plate split original plates 713a, 713b, 713c is formed in a cross-sectional arc shape, and the respective side edges are joined to produce the bow side split inner plate 713,
(D) The duct division outer plate 711, the stern side division inner plate 712, and the bow side division inner plate 713 are joined according to the fourth embodiment to complete the division duct 710,
(E) Similarly, the divided ducts 720 and 730 are completed,
(F) The divided ducts 710, 720, and 730 are joined to each other to complete the marine duct 7.
In addition, although the bow side division | segmentation inner board 713,723,733 shows what is manufactured from the division | segmentation original board 713a, 713b, 713c ... for the bow side inner board divided | segmented, this invention is limited to this. However, it may be manufactured from one original plate or from four or more divided original plates.

[Embodiment 7: Method for Manufacturing Ship Duct—Part 4]
FIG. 10: is a schematic cross section for demonstrating the manufacturing method of the ship duct which concerns on Embodiment 7 of this invention. In FIG. 10, the manufacturing method of the marine duct 8 is such that the pipe body 40 is installed along the bow side edge portion 11 of the duct outer plate 10 and the bow side edge portion 31 of the bow side inner plate 30 is joined to the pipe body 40. To do.
Therefore, accurate positioning of the bow side edge of the marine duct 8 is facilitated. Further, since the tube body 40 has an accurate and large curvature, it is not necessary to process the bow side edge portion 31 of the bow side inner plate 30 to have a large curvature, and the production of the bow side inner plate 30 is further facilitated.
Further, when the bow side edge portion 11 of the duct outer plate 10 and the bow side inner plate 30 are directly joined to the bow side edge portion 31, a “corner” is formed in the joint portion, and the outer surface of the bow side edge portion is made smooth. However, since the pipe 40 is installed in the marine duct 8, such a work becomes unnecessary. Therefore, workability is improved and manufacturing costs are reduced.

The tube body 40 may be one tube body formed in an annular shape or semi-annular shape, or may be formed by joining a plurality of divided tube bodies to each other. Moreover, the tubular body 40 can be implemented in any of Embodiments 4 to 6 (manufacturing method of marine ducts-1 to 3).
For example, in the case of carrying out in Embodiment 5 (Manufacturing method of marine duct-2), pipe body 40 is installed on bow side edge portions 11a and 11b of annular duct outer plates 10a and 10b, and the outside of the duct After joining the circular stern side inner plates 20a, 20b to the stern side edges 12a, 12b of the plates 10a, 10b, the divided inner plates 301a, 302b for the bow side inner plates respectively formed in a circular arc shape in cross section. Are joined to the tube body 40, and the stern side edges of the split inner plates 301a, 302b,... Are joined to the bow side edges 21a, 21b of the stern side plates 20a, 20b. It will be.

  Since the present invention has the above-described configuration, the manufacturing cost can be reduced and the construction period can be shortened, and the propulsion performance can be maintained or improved. Therefore, the present invention is widely used as an energy-saving device for various ship shapes and a manufacturing method thereof. can do.

The partial side view which shows the outline | summary of the ship with a ship duct concerning Embodiment 1 of this invention. The side view which shows the outline | summary of the duct for ships concerning Embodiment 2 of this invention. The schematic diagram explaining the cross-sectional shape of the duct for ships shown in FIG. The side view which shows the outline | summary of the duct for ships concerning Embodiment 3 of this invention. The schematic diagram explaining the duct for ships used for the comparison of the energy-saving effect of this invention. The schematic diagram explaining the energy saving effect of the duct for ships which concerns on Embodiment 3 of this invention. The correlation diagram of lift-drag ratio-attack angle which shows a CFD simulation result. The schematic diagram explaining the manufacturing method of the duct for ships which concerns on Embodiment 4 of this invention. The schematic diagram explaining the manufacturing method of the duct for ships concerning Embodiment 6 of this invention. Sectional drawing explaining the manufacturing method of the duct for ships which concerns on Embodiment 7 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ship 2 Hull 3 Propeller 4 Ship duct (Embodiment 1)
5 Ship Duct (Embodiment 2)
6 Marine Duct (Embodiment 4)
7 Marine Duct (Embodiment 6)
8 Marine Duct (Embodiment 7)
10 duct outer plate 11 bow side edge 12 stern side edge 13 ridge line 20 stern side inner plate 21 bow side edge 22 stern side edge 23 ridge line 30 bow side inner plate 31 bow side edge 32 stern side edge 33 ridge line 40 Tubular body 710 Split duct 711 Duct split outer plate 712 Stern side split inner plate 713 Bow side split inner plate 720 Split duct

Claims (10)

A duct skin whose bow side is part of a larger cone than the stern side;
A stern side inner plate that is a part of a cylinder connected to a stern side edge of the duct outer plate in a state of being accommodated in the duct outer plate;
A bow side inner plate that smoothly connects the bow side edge of the duct outer plate and the bow side edge of the stern side inner plate in a state of being accommodated in the duct outer plate;
A marine duct installed at a stern part of a hull.   The ship duct according to claim 1, wherein an upper side of the duct outer plate is longer than a lower side, and an upper side of the stern side inner plate is longer than a lower side.   The marine duct according to claim 1 or 2, wherein the stern side inner plate is a part of a cylinder.   The ship duct according to any one of claims 1 to 3, wherein a shape of a cross section including a central axis of the bow side inner plate is a single arc or a plurality of continuous arcs. A pipe or bar is installed along the bow side edge of the duct outer plate,
The ship duct according to any one of claims 1 to 4, wherein a bow side edge portion of the bow side inner plate is connected to the pipe material or the bar material. The hull,
A propeller installed protruding from the stern of the hull;
The marine duct according to any one of claims 1 to 5, installed at the stern of the hull,
A ship with a duct for a ship. A duct skin that is part of a cone whose bow side is larger than the stern side and whose upper side is longer than the lower side;
A tubular stern side inner plate that is connected to the stern side edge of the duct outer plate in a state accommodated in the duct outer plate, and whose upper side is longer than the lower side,
A bow side inner plate that smoothly connects the bow side edge of the duct outer plate and the bow side edge of the stern side inner plate in a state of being accommodated in the duct outer plate;
A method for manufacturing a marine duct installed at a stern portion of a hull, comprising:
A step of manufacturing the duct outer plate by forming a duct outer plate original plate that is substantially fan-shaped so that the distance between the outer peripheral edge and the inner peripheral edge approaches one side edge to form a part of a cone; and ,
A stern side inner plate is manufactured by forming a stern side inner plate, which is substantially trapezoidal so that one hypotenuse is perpendicular to the base and the other hypotenuse is closer to the upper side so as to form a part of a cylinder. Process,
Connecting the stern side edge of the stern side inner plate to the stern side edge of the duct outer plate in a state accommodated in the duct outer plate; and
A plurality of substantially fan-shaped divided inner plates for bow side inner plates whose distance between the outer peripheral edge and the inner peripheral edge varies are formed in a circular arc shape in cross section, and the respective side edges are joined to produce the bow side inner plate. Connecting the bow side edge of the bow side inner plate to the bow side edge of the duct outer plate, and connecting the stern side edge of the bow side inner plate to the bow side edge of the stern side inner plate. Completing the marine duct,
A manufacturing method of a marine duct having Installing a tube or rod along the bow side edge of the duct skin;
Instead of connecting the bow side edge portion of the bow side inner plate to the bow side edge portion of the duct outer plate, connecting the bow side edge portion of the bow side inner plate to the tube body or rod body. 8. A method for manufacturing a marine duct according to claim 7, wherein A duct skin that is part of a cone whose bow side is larger than the stern side and whose upper side is longer than the lower side;
A tubular stern side inner plate that is connected to the stern side edge of the duct outer plate in a state accommodated in the duct outer plate, and whose upper side is longer than the lower side,
A bow side inner plate that smoothly connects the bow side edge of the duct outer plate and the bow side edge of the stern side inner plate in a state of being accommodated in the duct outer plate;
A method for manufacturing a marine duct installed at a stern portion of a hull, comprising:
A step of manufacturing the duct outer plate by forming a duct outer plate original plate that is substantially fan-shaped so that the distance between the outer peripheral edge and the inner peripheral edge approaches one side edge to form a part of a cone; and ,
A stern side inner plate is manufactured by forming a stern side inner plate, which is substantially trapezoidal so that one hypotenuse is perpendicular to the base and the other hypotenuse is closer to the upper side so as to form a part of a cylinder. Process,
Connecting the stern side edge of the stern side inner plate to the stern side edge of the duct outer plate in a state accommodated in the duct outer plate; and
Forming a plurality of bow-side inner plate-shaped divided original plates each having a substantially circular arc shape in which the distance between the outer peripheral edge and the inner peripheral edge varies;
The bow side edge of the bow side inner plate split original plate formed in the cross-section arc shape is connected to the bow side edge of the duct outer plate, and the stern side edge of the bow side inner plate split original plate is the stern Connecting to the bow side edge of the side inner plate,
Joining the split original plates for the bow side inner plate connected to the bow side edge of the duct outer plate and the bow side edge of the stern side inner plate to complete the ship duct;
A manufacturing method of a marine duct having Installing a tube or rod along the bow side edge of the duct skin;
Instead of connecting the bow side edge portion of the bow side inner plate dividing original plate formed in the cross-section arc shape to the bow side edge portion of the duct outer plate,
10. The ship duct manufacturing method according to claim 9, wherein a bow side edge portion of the bow side inner plate dividing master plate formed in an arc shape in cross section is connected to the tube body or the rod body.

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