Tank and method for manufacturing tank

Abstract

The invention provides a storage tank and a manufacturing method of the storage tank. A tank (10) is provided with: an inner container (12); a joint (14) having a cylindrical boss section (26) that connects the inside and the outside of the inner container, and a flange section (28) that protrudes from the boss section in the radial direction of the boss section; the wrapping layer (16) includes a winding member (30) wound a plurality of times on an object to be wound including the liner and the flange portion, and a reinforcing sheet (32) is provided at a portion of the wrapping layer covering the flange portion, the reinforcing sheet being separate from the winding member and overlapping the winding member. The direction of the fibers contained in the fiber-reinforced resin constituting the reinforcing sheet intersects the direction of the fibers contained in the fiber-reinforced resin constituting the portion of the winding member that is in contact with the reinforcing sheet. Therefore, the inner container can be better covered by the coating layer.

Description

Technical Field

[0001] The invention relates to a storage tank and a method for manufacturing the storage tank. Background Art

[0002] A storage tank for storing high-pressure hydrogen is disclosed in Japanese Patent Authorization Gazette No. 6549514. The storage tank has an inner liner, which has a cylindrical body and dome-shaped side ends. Joints are installed at both ends of the inner liner. The outer surfaces of the inner liner and the joint are covered with a coating layer composed of fiber-reinforced resin. Summary of the invention

[0003] In the technology disclosed in Japanese Invention Patent Authorization Gazette No. 6549514, a sheet made of fiber-reinforced resin is wound around an inner liner. A plurality of notches are provided at the end of the tubular sheet wound around the inner liner to form a small piece. The small piece covers the side end of the inner liner. However, a storage tank and a method for manufacturing the storage tank are desired that can better cover the inner liner with a coating layer.

[0004] The purpose of the present invention is to solve the above technical problems.

[0005] The first aspect of the present invention is a storage tank comprising an inner liner, a joint and a covering layer, wherein the joint comprises a cylindrical boss portion connecting the interior of the inner liner with the exterior and a flange portion radially protruding from the boss portion toward the boss portion; the covering layer comprises a winding component which is wound multiple times on a winding object comprising the inner liner and the flange portion, a reinforcing sheet is provided at a portion of the covering layer covering the flange portion, the reinforcing sheet is separate from the winding component and overlaps with the winding component, and the direction of fibers contained in the fiber-reinforced resin constituting the reinforcing sheet is intersected with the direction of fibers contained in the fiber-reinforced resin constituting the portion of the winding component in contact with the reinforcing sheet.

[0006] The second aspect of the present invention is a method for manufacturing a storage tank, which has an inner liner, a joint and a covering layer, wherein the joint has a cylindrical boss portion that connects the interior and exterior of the inner liner and a flange portion that radially protrudes from the boss portion toward the boss portion; the covering layer includes a winding component, which is wound multiple times on a winding object including the inner liner and the flange portion, and the manufacturing method has a winding step and a reinforcement step, wherein in the winding step, the winding component is wound on the winding object; in the reinforcement step, a reinforcement sheet separate from the winding component is overlapped with the winding component at a portion of the covering layer covering the flange portion, and the direction of fibers contained in the fiber-reinforced resin constituting the reinforcement sheet and the direction of fibers contained in the fiber-reinforced resin constituting the portion of the winding component that contacts the reinforcement sheet are mutually crossed.

[0007] According to the present invention, the inner container can be better covered by the covering layer.

[0008] The above-mentioned objects, features, and advantages will be easily understood from the following description of the embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a cross-sectional view of the tank.

[0010] Figure 2 This is a diagram for explaining a winding method of a winding member.

[0011] Figure 3 This is a schematic diagram of the operation of overlapping the reinforcing sheet and the winding member.

[0012] Figure 4 This is a schematic diagram of the operation of overlapping the reinforcing sheet and the winding member.

[0013] Figure 5 This is a schematic diagram of the operation of overlapping the reinforcing sheet and the winding member.

[0014] Figure 6 This is a cross-sectional view near the joint of the tank.

[0015] Figure 7 This is a schematic diagram of the operation of overlapping the reinforcing sheet and the winding member.

[0016] Fig. 8A It is a figure which shows a reinforcement sheet. Figure 8B It is a diagram showing a reinforcement sheet group.

[0017] Fig. 9 This is a schematic diagram of the operation of overlapping the reinforcing sheet and the winding member.

[0018] Fig. 10A It is a figure which shows a reinforcement sheet. Fig. 10B It is a figure which shows a reinforcement sheet. Fig. 10C It is a diagram showing a reinforcement sheet group.

[0019] Fig.11 This is a cross-sectional view near the joint of the tank.

[0020] Fig. 12A It is a figure which shows the reinforcement sheet which comprises a buffer member. Fig. 12B It is a figure which shows the reinforcement sheet which comprises a buffer member.

[0021] Fig.13A It is a figure which shows the reinforcement sheet which comprises a buffer member. Fig. 13B It is a figure which shows the reinforcement sheet which comprises a buffer member. DETAILED DESCRIPTION

[0022] Hereinafter, a storage tank and a method for manufacturing a storage tank according to the present invention will be described with reference to the drawings while listing preferred embodiments.

[0023] [First embodiment] [Structure of storage tank] Figure 1 1 is a cross-sectional view of the storage tank 10. The storage tank 10 is, for example, a hydrogen storage tank that is mounted on a fuel cell vehicle and stores hydrogen used as a fuel gas in the fuel cell vehicle. The gas stored in the storage tank 10 is not limited to hydrogen, but may also be natural gas, etc. The storage tank 10 is not limited to a storage tank mounted on a fuel cell vehicle that uses gas as fuel, but may be a storage tank mounted on a vehicle for transporting gas, or may be a storage tank installed on a ground facility for storing gas.

[0024] The storage tank 10 includes an inner liner 12 filled with high-pressure gas, a pair of joints 14 attached to both ends of the inner liner 12 , and a coating layer 16 covering the outer peripheral surface of the inner liner 12 .

[0025] The liner 12 is formed of, for example, polyamide or high-density polyethylene having high hydrogen barrier properties. The liner 12 has a cylindrical portion 18, a pair of dome portions 20 formed at both ends of the cylindrical portion 18, and a mounting portion 22 to which the joint 14 is mounted. The mounting portion 22 has an opening 24 formed therein.

[0026] The joint 14 has a cylindrical boss portion 26 and a flange portion 28 protruding from the boss portion 26 in the radial direction of the boss portion 26. The boss portion 26 is connected to the opening 24 of the inner container 12 to connect the inside and outside of the inner container 12.

[0027] The coating layer 16 covers the outer surface of the cylindrical portion 18 , the outer surface of the dome portion 20 , and the outer surface of the flange portion 28 .

[0028] The inner container 12 is mounted on a filament winding device (not shown) so as to be rotatable about the axis A. The filament winding device is a winding member 30 (see Figure 2) is wound around the inner liner 12. The fiber-reinforced resin is a ribbon-shaped fiber bundle in which a resin is impregnated in the fiber. For example, carbon fiber, glass fiber, etc. are used as the fiber. Epoxy resin, polyester fiber, etc., which are thermosetting resins, are used as the resin. The direction of the fibers contained in the fiber-reinforced resin constituting the winding part 30 is along the longitudinal direction of the winding part 30. In the following, the direction of the fibers contained in the fiber-reinforced resin constituting the winding part 30 is sometimes simply recorded as the direction of the fibers of the winding part 30. The fiber-reinforced resin is laminated by winding the winding part 30 on the inner liner 12, thereby forming the covering layer 16. The covering layer 16 is pressurized and heated together with the inner liner 12 to be cured.

[0029] [Regarding winding of winding parts] Figure 2 This is a diagram for explaining a winding method of the winding member 30. The winding method of the winding member 30 includes hoop winding and spiral winding. Figure 2 The winding method of the winding member 30a is hoop winding. When the inner liner 12 is viewed from the side, the angle formed by the axis A and the length direction of the winding member 30a is approximately 90 degrees. Figure 2 The winding method of the winding member 30b and the winding member 30c is spiral winding. The winding member 30b does not pass over the flange portion 28 of the joint 14. On the other hand, the winding member 30c passes over the flange portion 28. When the inner liner 12 is viewed from the side, the angle B formed by the axis A and the length direction of the winding member 30b is less than 90 degrees. When the inner liner 12 is viewed from the side, the angle C formed by the axis A and the length direction of the winding member 30c is less than the angle B formed by the axis A and the length direction of the winding member 30b. In the following, the angle formed by the axis A and the length direction of the winding member 30 is sometimes simply recorded as the angle of the winding member 30.

[0030] The cylindrical portion 18 is reinforced by an annular band layer composed of a winding member 30 wound in a circumferential winding manner in the cladding layer 16. The dome portion 20 and the flange portion 28 are reinforced by a helical layer composed of a winding member 30 wound in a spiral winding manner in the cladding layer 16. The winding member 30 wound in a spiral winding manner on the dome portion 20 and the flange portion 28 is also wound in a spiral winding manner on the cylindrical portion 18. Therefore, the cladding layer 16 covering the cylindrical portion 18 includes an annular band layer and a helical layer. However, the helical layer covering the cylindrical portion 18 has almost no effect on the reinforcement of the cylindrical portion 18.

[0031] High stress is applied to the base of the flange 28 of the joint 14. Therefore, it is considered to increase the strength of the coating layer 16 covering the flange 28 by making the number of windings of the winding member 30 passing over the flange 28 greater than the number of windings of the winding member 30 not passing over the flange 28.

[0032] The angle of the winding member 30 passing over the flange portion 28 is small. The smaller the angle of the winding member 30, the greater the ratio of the portion of the winding member 30 passing over the cylindrical portion 18 to the portion of the winding member 30 passing over the dome portion 20 or the flange portion 28. The greater the number of times the winding member 30 passing over the flange portion 28 is wound, the greater the volume of the spiral layer covering the cylindrical portion 18, although the spiral layer covering the cylindrical portion 18 hardly contributes to the reinforcement of the cylindrical portion 18.

[0033] The tank 10 of the present embodiment has a reinforcing sheet 32 ​​at a portion of the coating layer 16 that covers the flange portion 28 . The reinforcing sheet 32 ​​overlaps with the wrapping member 30 .

[0034] Figure 3 to Figure 5 3 is a schematic diagram of the operation of overlapping the reinforcing sheet 32 ​​and the wrapping member 30. Figure 3 to Figure 5 The thin lines on the winding member 30 shown indicate the direction of the fibers of the winding member 30. Figure 3 to Figure 5 The thin lines on the reinforcement sheet 32 ​​shown indicate the direction of the fibers of the reinforcement sheet 32. Figure 3 to Figure 5 As shown, each time the wrapping member 30 is wrapped around the flange 28 once, the reinforcing sheet 32 ​​is attached to the portion of the wrapping member 30 passing over the flange 28. The reinforcing sheet 32 ​​may be attached to the portion of the wrapping member 30 passing over the flange 28 in advance.

[0035] The reinforcing sheet 32 ​​is made of fiber reinforced resin. The lengthwise dimension of the reinforcing sheet 32 ​​is sufficiently smaller than the lengthwise dimension of the wrapping member 30. The lengthwise dimension of the reinforcing sheet 32 ​​is larger than the diameter dimension D of the boss portion 26 of the joint 14 and smaller than the diameter dimension E of the flange portion 28 of the joint 14 (see Figure 3 The length dimension of the reinforcing sheet 32 ​​may be equal to the diameter dimension E of the flange portion 28 of the joint 14 (see Figure 3 The length dimension of the reinforcing sheet 32 ​​may also be larger than the diameter dimension E of the flange portion 28 of the joint 14 and smaller than the diameter dimension F of the liner 12 (see Figure 3 The width of the reinforcing sheet 32 ​​is substantially equal to the width of the wrapping member 30. The width of the reinforcing sheet 32 ​​may be greater than the width of the wrapping member 30. The width of the reinforcing sheet 32 ​​may also be less than the width of the wrapping member 30.

[0036] The direction of the fibers contained in the fiber-reinforced resin constituting the reinforcing sheet 32 ​​intersects with the direction of the fibers contained in the fiber-reinforced resin constituting the portion of the winding member 30 that contacts the reinforcing sheet 32. In the following, the direction of the fibers contained in the fiber-reinforced resin constituting the reinforcing sheet 32 ​​is sometimes described as the direction of the fibers of the reinforcing sheet 32.

[0037] Figure 61 is a cross-sectional view of the vicinity of the joint 14 of the storage tank 10. The wrapping member 30 and the reinforcing sheet 32 ​​are alternately stacked at the portion of the coating layer 16 covering the flange portion 28. The wrapping member 30 and the reinforcing sheet 32 ​​may also be alternately stacked at the portion of the coating layer 16 covering a portion of the dome portion 20 adjacent to the flange portion 28. The reinforcing sheet 32 ​​is biased toward the inner side in the thickness direction of the coating layer 16. The reinforcing sheet 32 ​​is provided within a range of at least one-half of the thickness of the coating layer 16.

[0038] This can reduce the number of times the winding member 30 passes over the flange portion 28 while maintaining the strength of the coating layer 16 covering the flange portion 28. Therefore, the volume of the helical layer covering the cylindrical portion 18 can be reduced.

[0039] [Second embodiment] Figure 7 3 is a schematic diagram of the operation of overlapping the reinforcing sheet 36 and the winding member 30. Figure 7 The thin lines on the winding member 30 shown indicate the direction of the fibers of the winding member 30. Figure 7 The thin lines on the reinforcing sheet 36 shown in FIG. 1 indicate the direction of the fibers of the reinforcing sheet 36. In the first embodiment, each time the wrapping member 30 is wrapped around the flange portion 28 once, the reinforcing sheet 32 ​​overlaps with the wrapping member 30. In contrast, in the present embodiment, Figure 7 As shown, each time one spiral layer covering the flange portion 28 is formed, the reinforcing sheet 36 overlaps the winding member 30 .

[0040] Fig. 8A It is a figure which shows the reinforcement sheet 36. Figure 8B 38 is a diagram showing a reinforcing sheet group 38. Fig. 8A and Figure 8B The thin lines on the reinforcement sheet 36 shown indicate the direction of the fibers of the reinforcement sheet 36. The reinforcement sheet 36 is formed in a fan shape, and the fibers of the reinforcement sheet 36 are arranged in a straight line and parallel to each other. A disk-shaped reinforcement sheet group 38 is formed by arranging 8 reinforcement sheets 36. More preferably, the reinforcement sheet 36 is formed to a size that can form a cross-sectional shape that becomes an isotensoid curved surface so that the tension of each layer of the helical layer is constant.

[0041] [Third embodiment] Fig. 9 3 is a schematic diagram of the operation of overlapping the reinforcing sheet 37 and the reinforcing sheet 39 with the wrapping member 30. Fig. 9 The thin lines on the winding member 30 shown indicate the direction of the fibers of the winding member 30. Fig. 9 The thin lines on the reinforcement sheet 37 shown indicate the direction of the fibers of the reinforcement sheet 37. Fig. 9The thin lines on the reinforcing sheet 39 shown in FIG. 3 indicate the direction of the fibers of the reinforcing sheet 39. In the first embodiment, each time the wrapping member 30 is wrapped around the flange portion 28 once, the reinforcing sheet 32 ​​overlaps with the wrapping member 30. In contrast, in the present embodiment, Fig. 9 As shown, each time one spiral layer covering the flange portion 28 is formed, the reinforcing sheets 37 and 39 overlap with the winding member 30 .

[0042] Fig. 10A It is a figure which shows the reinforcement sheet 37. Fig. 10B It is a figure which shows the reinforcement sheet 39. Fig. 10C 4 is a diagram showing the reinforcing sheet group 41. Fig. 10A and Fig. 10C The thin lines on the reinforcement sheet 37 shown indicate the direction of the fibers of the reinforcement sheet 37. Fig. 10B and Fig. 10C The thin lines on the reinforcement sheet 39 shown indicate the direction of the fibers of the reinforcement sheet 39 .

[0043] The reinforcing sheet 37 is formed into a rectangular shape, and the fibers of the reinforcing sheet 37 are arranged in a straight line parallel to each other. The reinforcing sheet 39 is formed into an isosceles triangle shape, and the fibers of the reinforcing sheet 39 are arranged in a straight line parallel to each other. A disc-shaped reinforcing sheet group 41 is formed by alternating 30 reinforcing sheets 37 and 30 reinforcing sheets 39.

[0044] [Fourth embodiment] Fig.11 It is a cross-sectional view of the vicinity of the joint 14 of the tank 10. In the present embodiment, a buffer member 40 is provided between the flange portion 28 and the coating layer 16.

[0045] The fiber-reinforced resin has a lower strength against a force pulled in a direction perpendicular to the direction of the fibers than against a force pulled in a direction parallel to the direction of the fibers contained in the fiber-reinforced resin. Therefore, when a sharp component contacts the fiber-reinforced resin, the fiber-reinforced resin may be damaged. The edge portion of the outer periphery of the flange portion 28 of the joint 14 is sharp. Therefore, in the prior art, a cushioning component made of resin is provided between the flange portion 28 and the coating layer 16.

[0046] The rigidity of the resin constituting the buffer component is lower than the rigidity of the joint 14 and the coating layer 16. In addition, the strength of the resin constituting the buffer component is lower than the strength of the joint 14 and the coating layer 16. When a compressive load is applied to the buffer component, the buffer component may be deformed or buckled. When the buffer component is deformed or buckled, the joint 14 is easy to move, so the joint 14 and the coating layer 16 may be damaged.

[0047] In the present embodiment, a cushioning member 40 made of fiber-reinforced resin is provided between the flange portion 28 and the cover layer 16 instead of the conventional cushioning member made of resin.

[0048] Fig. 12A It is a diagram showing a reinforcing sheet 42 constituting the buffer member 40 . Fig. 12B 4 is a diagram showing a reinforcing sheet 44 constituting the buffer member 40. Fig. 12A The thin lines on the reinforcement sheet 42 shown indicate the direction of the fibers of the reinforcement sheet 42. Fig. 12B The thin lines on the reinforcement sheet 44 shown indicate the direction of the fibers of the reinforcement sheet 44. The reinforcement sheet 42 and the reinforcement sheet 44 are made of fiber reinforced resin. The reinforcement sheet 42 is formed in a fan shape, and the fibers of the reinforcement sheet 42 are arranged in a straight line and parallel to each other. A disk-shaped reinforcement sheet group 46 is formed by arranging eight reinforcement sheets 42. The reinforcement sheet 44 is formed in a disk shape, and the direction of the fibers of the reinforcement sheet 44 is along the circumferential direction of the reinforcement sheet 44.

[0049] The buffer component 40 is formed by alternately overlapping the reinforcing sheet group 46 and the reinforcing sheet 44. As a result, the direction of the fibers of the reinforcing sheet 42 of the reinforcing sheet group 46 intersects with the direction of the fibers of the reinforcing sheet 44. As a result, the buffer component 40 with high hardness and strength can be formed. Therefore, even when a compressive load acts on the buffer component 40, deformation and buckling of the buffer component 40 can be suppressed. As a result, the joint 14 does not move, and damage to the joint 14 and the covering layer 16 can be suppressed.

[0050] Can also replace Fig. 12A The reinforcing sheet 42 of the buffer member 40 of the structure shown in the figure is used in the third embodiment. Fig. 10C The reinforcement sheet group 41 is shown.

[0051] The cushioning member 40 may be formed of a reinforcement sheet different from the reinforcement sheet 42 and the reinforcement sheet 44 . Fig.13A 4 is a diagram showing a reinforcing sheet 48 constituting the buffer member 40. Fig.13A The thin lines on the reinforcement sheet 48 shown indicate the direction of the fibers of the reinforcement sheet 48 . Fig. 13B 4 is a diagram showing a reinforcing sheet 50 constituting the buffer member 40. Fig. 13B The thin lines on the reinforcing sheet 50 shown indicate the direction of the fibers of the reinforcing sheet 50. The reinforcing sheet 48 and the reinforcing sheet 50 are made of fiber-reinforced resin. The reinforcing sheet 48 and the reinforcing sheet 50 have the same shape. The reinforcing sheet 48 is formed in a disc shape, and the fibers of the reinforcing sheet 48 are arranged in a straight line and parallel to each other. The reinforcing sheet 50 is formed in a disc shape, and the fibers of the reinforcing sheet 50 are arranged in a straight line and parallel to each other.

[0052] The cushioning member 40 is formed by alternately overlapping the reinforcing sheets 48 and the reinforcing sheets 50 so that the direction of the fibers of the reinforcing sheets 48 intersects the direction of the fibers of the reinforcing sheets 50 .

[0053] The fiber-reinforced resin constituting each of the reinforcing sheets 42, 44, 48, and 50 may not have fibers extending in one direction. These fiber-reinforced resins may also form a woven fabric with one fiber intersecting another fiber.

[0054] In connection with the above disclosure, the following additional notes are also disclosed.

[0055] (Note 1) A storage tank (10) comprises an inner liner (12), a joint (14) and a coating layer (16), wherein the joint comprises a cylindrical boss portion (26) for connecting the inside and outside of the inner liner and a flange portion (28) protruding radially from the boss portion toward the boss portion; the coating layer comprises a winding component (30) which is wound multiple times on a winding object including the inner liner and the flange portion, a reinforcing sheet (32) is provided at a portion of the coating layer covering the flange portion, the reinforcing sheet is separate from the winding component and overlaps with the winding component, and the direction of the fibers contained in the fiber-reinforced resin constituting the reinforcing sheet and the direction of the fibers contained in the fiber-reinforced resin constituting the portion of the coating component contacting the reinforcing sheet intersect each other. According to such a structure, the strength of the coating layer covering the flange portion can be maintained while suppressing the number of windings of the winding component passing from above the flange portion. Therefore, the volume of the spiral layer covering the cylindrical portion can be reduced, which is conducive to reducing costs.

[0056] (Note 2) In the storage tank described in Appendix 1, the inner tank may include a cylindrical portion (18) and a pair of dome portions (20) formed at both ends of the cylindrical portion, and the joint is provided at at least one of the dome portions. According to such a structure, the volume of the spiral layer covering the cylindrical portion can be reduced.

[0057] (Note 3) In the tank described in Appendix 1 or 2, the wrapping member and the reinforcing sheet may be alternately stacked at a portion of the coating layer covering the flange portion. According to such a structure, even if the number of wrappings of the wrapping member passing over the flange portion is reduced, the strength of the coating layer covering the flange portion can be maintained.

[0058] (Note 4) In the tank described in Supplement 1 or 2, the reinforcing sheet may be located closer to the inner side of the coating layer in the thickness direction. According to such a structure, even if the number of times the wrapping member passes over the flange portion is reduced, the strength of the coating layer covering the flange portion can be maintained.

[0059] (Note 5) In the tank described in Supplement 4, the reinforcing sheet may be provided within a range of at least one-half of the thickness of the coating layer. According to such a structure, even if the number of times the winding member passes over the flange portion is reduced, the strength of the coating layer covering the flange portion can be maintained.

[0060] (Note 6) In the tank according to Supplementary Note 1 or 2, one of the plurality of reinforcing sheets may be in contact with the outer surface of the flange portion. According to such a structure, damage to the winding member can be suppressed.

[0061] (Note 7) In the tank described in Supplementary Note 6, it is possible to further include another reinforcing sheet overlapping with the one reinforcing sheet and in contact with the one reinforcing sheet, and at a location where the one reinforcing sheet and the other reinforcing sheet contact each other, the direction of the fibers contained in the fiber-reinforced resin constituting the one reinforcing sheet intersects with the direction of the fibers contained in the fiber-reinforced resin constituting the other reinforcing sheet. According to such a structure, the strength of the buffer member provided between the covering layer and the flange portion can be improved.

[0062] (Note 8) A method for manufacturing a storage tank, the storage tank having an inner liner, a joint and a covering layer, wherein the joint has a cylindrical boss portion that connects the inside and outside of the inner liner and a flange portion that protrudes radially from the boss portion toward the boss portion; the covering layer includes a winding component, the winding component is wound multiple times on a winding object including the inner liner and the flange portion, and the manufacturing method has a winding step and a reinforcement step, wherein in the winding step, the winding component is wound on the winding object; in the reinforcement step, a reinforcement sheet that is separate from the winding component overlaps with the winding component at a portion of the covering layer covering the flange portion, and the direction of the fibers contained in the fiber-reinforced resin constituting the reinforcement sheet and the direction of the fibers contained in the fiber-reinforced resin constituting the portion of the covering member that contacts the reinforcement sheet intersect each other. According to such a method, the strength of the covering layer covering the flange portion can be maintained while suppressing the number of windings of the winding component passing from above the flange portion. Therefore, the volume of the spiral layer covering the cylindrical portion can be reduced.

[0063] In addition, the present invention is not limited to the above contents, and various structures can be adopted without departing from the gist of the present invention.

Claims

1. A storage tank (10), characterized in that: It comprises an inner liner (12), a joint (14) and a coating layer (16), wherein: The joint comprises: a boss portion (26) which is cylindrical and is used to connect the interior of the inner container with the exterior; and a flange portion (28) which protrudes from the boss portion toward the radial direction of the boss portion; The coating layer (16) comprises a winding component, which is wound multiple times on a winding object including the inner liner and the flange portion. A reinforcing sheet (32) is provided at a portion of the covering layer covering the flange portion. The reinforcing sheet is separate from the wrapping member and overlaps with the wrapping member. The direction of fibers contained in the fiber-reinforced resin constituting the reinforcing sheet and the direction of fibers contained in the fiber-reinforced resin constituting a portion of the wrapping member that contacts the reinforcing sheet intersect with each other.

2. The storage tank according to claim 1, characterized in that: The inner container comprises a cylindrical portion (18) and a pair of dome portions (20) formed at both ends of the cylindrical portion. The joint is provided at least on one of the dome portions.

3. The storage tank according to claim 1 or 2, characterized in that: The wrapping members and the reinforcing sheets are alternately stacked at a portion of the coating layer that covers the flange portion.

4. The storage tank according to claim 1 or 2, characterized in that: The reinforcing sheet is biased toward the inner side of the covering layer in the thickness direction.

5. The storage tank according to claim 4, characterized in that: The reinforcing sheet is provided within a range of at least one half of the thickness of the covering layer.

6. The storage tank according to claim 1 or 2, characterized in that: One of the plurality of reinforcing sheets is in contact with an outer surface of the flange portion.

7. The storage tank according to claim 6, characterized in that: Also having another reinforcing sheet overlapping with and in contact with the one reinforcing sheet, At a portion where the one reinforcing sheet and the other reinforcing sheet contact each other, the direction of fibers contained in the fiber-reinforced resin constituting the one reinforcing sheet intersects the direction of fibers contained in the fiber-reinforced resin constituting the other reinforcing sheet.

8. A method for manufacturing a storage tank, the storage tank having an inner liner, a joint and a coating layer, wherein: The joint has a cylindrical boss portion that connects the inside and outside of the liner and a flange portion that protrudes from the boss portion toward the radial direction of the boss portion; The coating layer includes a winding component, which is wound multiple times on a winding object including the inner liner and the flange portion. It is characterized in that There are winding steps and strengthening steps, wherein, In the winding step, the winding member is wound on the winding object; In the reinforcing step, a reinforcing sheet separate from the wrapping member is overlapped with the wrapping member at a portion of the covering layer covering the flange portion. The direction of fibers contained in the fiber-reinforced resin constituting the reinforcing sheet and the direction of fibers contained in the fiber-reinforced resin constituting a portion of the wrapping member that contacts the reinforcing sheet intersect with each other.

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