JP2019151072A - Fiber structure and pressure vessel - Google Patents

Abstract

To provide a fiber structure and a pressure vessel capable of suppressing decrease of pressure resistance.SOLUTION: In a high pressure tank 10, a reinforcement fiber sheet 19 has a starting end part 19a which extends in an axial direction of a liner 12 and becomes a starting point to be winded on the liner 12. The liner 12 is assembled with an abutting surface 12a extending in an axial direction and a radial direction, and a circular arc-shaped wrapping surface 12b continuous with the abutting surface 12a and having a radius different from a radius of an outer peripheral surface of the liner 12. A height of the abutting surface 12a matches with a thickness of the reinforcement fiber sheet 19. The starting end part 19a of the reinforcement fiber sheet 19 is abutted with the abutting surface 12a and a part of the reinforcement fiber sheet 19 is winded on the wrapping surface 12b.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a fiber structure having a reinforcing fiber sheet that covers a liner from the outside, and a pressure vessel.

  A pressure vessel (a so-called high pressure tank) that accommodates compressed natural gas (CNG), liquefied natural gas (LNG), or the like is generally heavy because it is made of metal such as steel or aluminum alloy. In recent years, automobiles using natural gas as fuel have attracted attention as low-emission vehicles, and automobiles using fuel cells as a power source have attracted attention as low-emission vehicles. Some automobiles store hydrogen gas in the fuel tank as the fuel for the fuel cell, but the pressure vessel serving as the fuel tank is heavy and the fuel consumption is deteriorated. In order to eliminate this inconvenience, a pressure vessel has been proposed in which the outer side of a liner (inner shell) having gas barrier properties is covered with a pressure-resistant fiber-reinforced composite material layer.

  In a pressure vessel, a liner generally has a shape having curved dome portions on both end sides in a direction in which a central axis of a cylindrical body portion extends (hereinafter referred to as an axial direction). The pressure vessel is filled with gas so as to have a pressure of several tens of MPa, but the liner is reinforced by a fiber reinforced composite material layer. Such a pressure vessel, for example, as disclosed in Patent Document 1, is reinforced by winding a single reinforcing fiber sheet around the outer peripheral surface of the body part a plurality of times from a direction orthogonal to the axis of the body part. A fiber sheet and a matrix resin are combined and manufactured.

JP 2017-141947 A

  The reinforcing fiber sheet is wound around the body portion with the start end portion at one end in the circumferential direction being wound around the body portion, and the reinforcing fiber sheet is wound around the start end portion of the reinforcing fiber sheet a plurality of times. . For this reason, the level | step difference resulting from the height of the start part is formed in the fiber layer formed of the reinforced fiber sheet. Therefore, fiber distortion is formed in the fiber layer due to the step, and the pressure resistance of the fiber reinforced composite material layer of the pressure vessel is lowered.

  The objective of this invention is providing the fiber structure and pressure vessel which can suppress a pressure | voltage resistant fall.

  A fiber structure for solving the above problem includes a liner including a cylindrical body part and a dome part continuous with at least one end in the axial direction of the body part, and along a circumferential direction of the liner. A reinforcing fiber sheet that is wound around an outer peripheral surface of the liner and covers the liner from the outside, and the reinforcing fiber sheet extends in the thread main axis direction in at least one of the circumferential direction and the axial direction of the liner. The reinforcing fiber sheet includes reinforcing fiber yarns arranged in a portion, wherein the reinforcing fiber sheet has a starting end portion that extends in an axial direction of the liner and starts to be wound around the liner, A butting surface extending at least in the axial direction and the radial direction of the body portion; and an arcuate winding surface that is continuous with the butting surface and has a radius different from the radius of the outer peripheral surface of the body portion; And the height of the butting surface along the radial direction of the body portion matches the thickness of the reinforcing fiber sheet, and the start end of the reinforcing fiber sheet is butted against the butting surface, and the winding The gist is that a part of the reinforcing fiber sheet is wound around the surface.

  According to this, the thickness of the starting end portion of the reinforcing fiber sheet can be absorbed by using the height of the abutting surface by abutting the starting end portion with the abutting surface. And it becomes difficult to form a level | step difference in the surrounding surface of the reinforcing fiber sheet which pinched | interposed the abutting surface in the circumferential direction of the trunk | drum part. For this reason, even if the fiber structure is formed by winding the reinforcing fiber sheet around the start end of the reinforcing fiber sheet, it is possible to suppress the distortion caused by the start end, and the pressure resistance is reduced due to the distortion. Can be suppressed.

Moreover, about a fiber structure, it is preferable that the said winding surface has an angle larger than 0 degree | times and 2 degrees or less with respect to the outer peripheral surface of the said trunk | drum part.
According to this, at least in the body part, the position where the winding surface and the outer peripheral surface of the body part intersect is a position where the radius changes. For this reason, the distortion | strain extended in the axial direction of a liner arises in the reinforcing fiber sheet wound around the liner. However, by setting the angle of the winding surface to 2 degrees or less, even if the reinforcing fiber sheet is distorted, it is possible to suppress a decrease in strength due to the distortion in the fiber reinforced composite material.

Moreover, about the fiber structure, it is preferable that the said liner equips the said dome part with the said butt | matching surface and the said winding surface.
According to this, it becomes difficult to form a step on the peripheral surface of the reinforcing fiber sheet in the entire axial direction of the liner. For this reason, even if the reinforcing fiber sheet is wound around the starting end portion of the reinforcing fiber sheet, it is possible to suppress the distortion caused by the starting end portion.

  Further, for the fiber structure, the reinforcing fiber sheet is made of woven fabric, and the first yarn arranged in the body portion and the dome portion so that the yarn main shaft direction extends in the circumferential direction of the liner, and the first And a second yarn forming the woven fabric, and the second yarn is arranged so that a yarn main axis direction extends in an axial direction of the body portion, and is arranged in the dome portion. It is preferable that the yarn main axis direction of the portion is arranged so as to extend in the axial direction of the dome portion.

  According to this, the direction of the main spindle of the first yarn extends in the circumferential direction of the liner, and the liner can be reinforced in the radial direction. The yarn main axis direction of the second yarn extends in the axial direction of the body portion and the dome portion of the liner. The liner can be reinforced in the axial direction as compared with the case where the yarn main axis direction of the second yarn is inclined and arranged in the axial direction of the body portion and the dome portion.

Moreover, about the fiber structure, the said butt | matching surface and the said winding surface may be formed in the said liner.
According to this, compared with the case where a butt | matching surface and a winding surface are provided with components different from a liner, a butt | matching surface and a winding surface can be arrange | positioned in the desired place.

In the fiber structure, the butt surface and the winding surface may be provided by integrating a spacer with the liner.
According to this, the change in the strength of the liner can be suppressed.

  A pressure vessel for solving the above problem is a pressure vessel having a fiber structure including a reinforcing fiber sheet that covers a liner from the outside, wherein the matrix resin and the fiber structure are combined, and the fiber The gist is that the structure is the fiber structure according to any one of claims 1 to 6.

  According to this, the thickness of the starting end portion of the reinforcing fiber sheet can be absorbed by using the height of the abutting surface by abutting the starting end portion with the abutting surface. And it becomes difficult to form a level | step difference in the surrounding surface of the reinforced fiber sheet located in the both sides on both sides of the abutting surface in the circumferential direction of a trunk | drum part. For this reason, even if it is a fiber structure formed by winding the reinforcing fiber sheet around the starting end portion of the reinforcing fiber sheet, the distortion caused by the starting end portion can be suppressed. Therefore, in the pressure vessel in which the matrix resin and the fiber structure are combined, a decrease in pressure resistance due to distortion can be suppressed.

  According to the present invention, a decrease in pressure resistance can be suppressed.

Sectional drawing which shows a high pressure tank typically. The front view which shows a fiber structure typically. The perspective view which shows a liner typically. The fragmentary sectional view which expands and shows a butt | matching surface and a winding surface. The enlarged view which shows a reinforced fiber sheet. (A) is an expanded sectional view which shows the reinforced fiber sheet which covers a trunk | drum, (b) is an expanded sectional view which shows the reinforced fiber sheet which covers a dome part. The fragmentary sectional view which expands and shows the part which faced the start end part and the butted surface. The figure which shows typically the manufacturing method of the fiber structure by a loom. (A) is a diagram schematically showing a state in which wefts are inserted, (b) is a diagram schematically showing a state after a beating operation, and (c) is a diagram schematically showing a state in which a reinforcing fiber sheet is wound around a liner. FIG. Sectional drawing which shows the butt | matching surface and winding surface which were formed of the spacer. Sectional drawing which shows another example of a butting surface and a winding surface.

Hereinafter, an embodiment in which a fiber structure and a pressure vessel are embodied in a fiber structure and a high-pressure tank included in a high-pressure tank will be described with reference to FIGS.
As shown in FIG. 1 or FIG. 2, a high-pressure tank 10 as a pressure vessel includes a fiber structure 21 having a thin and hollow liner 12 and a reinforcing fiber sheet 19 that covers the outside of the liner 12, and a matrix resin Ma. It is composed by combining. The high-pressure tank 10 reinforces the liner 12 with a fiber-reinforced composite material layer 11 in which a matrix resin Ma and a reinforcing fiber sheet 19 are combined, and ensures the pressure resistance (mechanical strength) of the high-pressure tank 10.

  The liner 12 is made of resin and has an elongated hollow shape. The direction in which the central axis L of the liner 12 extends is the axial direction. The liner 12 includes a cylindrical body portion 13. The central axis of the body portion 13 coincides with the central axis L of the liner 12. The liner 12 has dome portions 14 at both ends in the axial direction Y of the body portion 13. The axial direction of the dome portion 14 coincides with the axial direction of the liner 12. The liner 12 includes a base portion 15 that protrudes outward along the axial direction Y from each dome portion 14. Each base part 15 is made of metal (for example, made of stainless steel). Each base portion 15 includes a hole portion 16 communicating with the space in the liner 12. A valve 17 is mounted in the hole 16 of the base portion 15 on one end side in the axial direction Y of the liner 12, and a screw 18 is screwed into the hole portion 16 in the base portion 15 on the other end side in the axial direction Y of the liner 12. Yes.

  As shown in FIG. 3 or FIG. 4, the liner 12 includes an abutting surface 12 a extending in the entire axial direction of the liner 12, that is, in the entire axial direction of the body portion 13 and both dome portions 14. The abutting surface 12 a is integrally formed with the liner 12. The butting surface 12 a extends from the outer peripheral surface of the liner 12 along the radial direction of the liner 12. The outer peripheral surface of the liner 12 is a surface along a circle C having a radius of the liner 12. In a cross-sectional view along the radial direction of the liner 12, the abutting surface 12 a extends from the outer peripheral surface of the liner 12 so as to protrude outward along the radial direction from the circle C along the outer peripheral surface at the portion where the cross section is formed. Extend.

  In the butt surface 12a, the height H from the outer peripheral surface (circle C) of the liner 12 is the same as the thickness of the reinforcing fiber sheet 19 described in detail later. The abutting surface 12a is manufactured aiming at a design median value, but deviates from the median value due to a manufacturing error or the like. The amount of deviation from the median is set as a tolerance. Therefore, the height of the abutting surface 12a includes a design median value and a value in which a tolerance is added to the median value.

  Moreover, the liner 12 is provided with the winding surface 12b which follows the butting surface 12a. The winding surface 12 b is integrally formed with the liner 12. The winding surface 12 b extends in the entire axial direction of the liner 12, that is, in the entire axial direction of the body portion 13 and both dome portions 14. In a cross-sectional view along the radial direction of the liner 12, the winding surface 12b has an arc shape. The winding surface 12b bulges outward in the radial direction from the circle C along the outer peripheral surface at the portion where the cross section is formed. Unlike the radius of the circle C, the radius of the winding surface 12b is larger than the radius of the circle C in the present embodiment. The radius of the winding surface 12b gradually decreases as the distance from the butt surface 12a increases along the circumferential direction of the liner 12.

  In a cross-sectional view along the radial direction, a position where a circle C along the outer peripheral surface of the liner 12 intersects with an arc along the winding surface 12b is defined as an intersection P. The intersecting portion P extends in the entire axial direction of the liner 12. And the winding surface 12b connects the cross | intersection part P and the front-end | tip of the protrusion direction of the butting surface 12a. The winding surface 12b is formed such that the winding surface 12b is inclined with respect to the circle C on the outer peripheral surface of the liner 12 at an angle of greater than 0 degrees and less than 2 degrees. In the present embodiment, the winding surface 12 b is formed to be inclined by 2 degrees with respect to the circle C on the outer peripheral surface of the liner 12.

  As shown in FIG. 5, the reinforcing fiber sheet 19 is a fiber bundle in which reinforcing fibers are bundled. As the reinforcing fibers, organic fibers or inorganic fibers may be used, or different types of organic fibers, different types of inorganic fibers, or mixed fibers in which organic fibers and inorganic fibers are mixed may be used. Examples of the organic fiber include aramid fiber, poly-p-phenylenebenzobisoxazole fiber, ultrahigh molecular weight polyethylene fiber, and the like, and examples of the inorganic fiber include carbon fiber, glass fiber, and ceramic fiber. In this embodiment, carbon fiber is used as the reinforcing fiber.

  The reinforcing fiber sheet 19 has a structure in which a woven fabric 24 woven by plain weaving a plurality of warp yarns 22 as first yarns and a plurality of weft yarns 23 as second yarns is laminated. The warp 22 and the weft 23 are arranged orthogonal to each other. As shown in FIG. 2, the plurality of warps 22 are arranged in the body portion 13 and each dome portion 14 in a state parallel to each other in the axial direction Y of the liner 12. The yarn main axis direction X1 of each warp 22 extends linearly in the circumferential direction of the liner 12 at the body portion 13 and the dome portion 14. Further, the radial direction of the liner 12 is orthogonal to the main spindle direction X1 of the warp 22.

  The plurality of wefts 23 are arranged in parallel with each other in the circumferential direction of the liner 12. In each weft 23, a portion linearly extending in the axial direction of the liner 12 along the outer peripheral surface of the body portion 13 is a body thread portion 23a. In each weft 23, a portion extending in the axial direction of the liner 12 along the outer peripheral surface of the dome portion 14 becomes a dome portion yarn portion 23 b. The dome thread portion 23 b is continuous with both ends of the trunk thread portion 23 a along the axial direction of the liner 12. In the weft 23, the yarn main axis direction X2 of the dome portion yarn portion 23b extends in the axial direction of the liner 12, and is curved along the curved surface of the dome portion 14. Further, in the weft 23, the yarn main axis direction X <b> 2 of the trunk yarn portion 23 a extends in the axial direction of the trunk portion 13 in the liner 12.

  The warp yarns 22 and the weft yarns 23 are arranged orthogonally, and the radial direction of the liner 12 is reinforced by aligning the extending direction of the yarn main shaft direction X1 of the warp yarn 22 with the circumferential direction of the liner 12, and the yarn main shaft direction X2 of the weft yarn 23 Is aligned with the axial direction of the liner 12 to reinforce the axial direction of the liner 12.

  As shown to Fig.6 (a), in the trunk | drum 13, the weft 23 is flat shape, thickness is thin and it is a wide shape. As shown in FIG. 6B, in the dome portion 14, the weft 23 is thicker and narrower than the trunk yarn portion 23 a, and the dome portion is directed from the trunk portion 13 toward the base portion 15. As the diameter of the thread 14 decreases, the weft 23 becomes thicker and narrower. On the other hand, the warp yarn 22 has the same thickness and width at the body portion 13 and the dome portion 14. In the fiber structure 21, the number of wefts 23 in the circumferential direction of the liner 12 is the same in the body portion 13 and the dome portion 14.

  The reinforcing fiber sheet 19 having the above configuration has a long belt shape. The reinforcing fiber sheet 19 is wound around the outer peripheral surface of the liner 12 such that the longitudinal direction extends in the circumferential direction of the liner 12. Therefore, as described above, the plurality of warp yarns 22 are arranged in the body portion 13 and the respective dome portions 14 in a state parallel to the axial direction Y of the liner 12, and the yarn main axis direction X1 of each warp yarn 22 The portion 13 and the dome portion 14 linearly extend in the circumferential direction of the liner 12. The plurality of wefts 23 are arranged in parallel with each other in the circumferential direction of the liner 12.

  As shown in FIG. 5, the reinforcing fiber sheet 19 includes a start end 19 a at one end in the circumferential direction. The start end portion 19 a is an end portion that starts winding when the reinforcing fiber sheet 19 is wound around the liner 12. The start end portion 19 a extends over the entire axial direction of the liner 12. The start end portion 19 a is formed by the tip end surface of the plurality of warp yarns 22 aligned in the short direction of the reinforcing fiber sheet 19 that coincides with the axial direction of the liner 12 in the yarn main axis direction X1. For this reason, the start end 19 a has the thickness of the warp 22, and the thickness of the start end 19 a is the thickness of the reinforcing fiber sheet 19. The height H of the abutting surface 12a of the liner 12 matches the thickness of the starting end portion 19a.

  As shown in FIG. 7, the fiber structure 21 includes the liner 12 and the reinforcing fiber sheet 19 configured as described above. In the fiber structure 21, the start end 19 a is butted against the butting surface 12 a of the liner 12. That is, the front end surface of each warp 22 constituting the starting end portion 19a is abutted against the abutting surface 12a. The reinforcing fiber sheet 19 with the start end portion 19a butted against the butting surface 12a is wound along the circle C on the outer peripheral surface of the liner 12, and then partially wrapped around the winding surface 12b. The reinforcing fiber sheet 19 is wound over a plurality of layers with respect to the layer of the reinforcing fiber sheet 19 wound around the outer peripheral surface of the liner 12 and the winding surface 12b.

  In the fiber structure 21, the start end 19 a is abutted against the abutting surface 12 a so that the thickness of the start end 19 a and the height of the winding surface 12 b are matched, and the reinforcing fiber sheet 19 wound around the outer peripheral surface of the liner 12. No large step is formed between the outer peripheral surface of the wire and the winding surface 12b. For this reason, in the fiber structure 21, only a slight distortion due to the height of the start end portion 19a is formed in the portion wound around the start end portion 19a.

Next, a method for manufacturing the high-pressure tank 10 will be described.
When the high-pressure tank 10 is manufactured, the knitted fabric 24 is wound around the liner 12 while plain weaving the warp 22 and the weft 23.

  As shown in FIG. 8, the weaving of the fabric 24 is performed by, for example, a plain weaving machine including two warp frames 31a and 31b for opening the warp yarns 22a and 22b arranged in the upper and lower parts of the warp yarn 22. . The plain weaving machine has a structure in which a warp beam 32 for supplying one warp 22a and a warp beam 33 for supplying the other warp 22b are arranged vertically. The warp yarn 22a fed from one warp beam 32 is opened by one warp frame 31a, and the warp yarn 22b fed from the other warp beam 33 is opened by the other warp frame 31b. . Note that the eyes of the collar frames 31a and 31b are indicated by black circles in the figure. The reed 34 is disposed between the reed frames 31 a and 31 b and the pre-weaving 35. The weft 23 is inserted (inserted) into the openings of the warps 22a and 22b by a weft insertion mechanism (not shown). In the delivery direction of the warps 22a and 22b, the liner 12 is rotatably supported before the weave 35. The liner 12 rotates about the center axis L as the center of rotation.

  When weaving the reinforcing fiber sheet 19 with the plain weaving machine, as shown in the enlarged view of FIG. 8 and FIG. 9A, the ends of the plurality of warp yarns 22a and 22b drawn from the warp beams 32 and 33 are used. Then, it is abutted against the abutting surface 12a as the starting end portion 19a. The warp yarns 22a and 22b forming the start end portion 19a are absorbed by the butt surface 12a, and the warp yarns 22a and 22b forming the start end portion 19a and the winding surface 12b are positioned at the same height. Then, the starting end portion 19a is fixed to the outer peripheral surface of the liner 12 with an adhesive, for example. The adhesive is preferably a material that melts by heating when the reinforcing fiber sheet 19 is impregnated and cured with the matrix resin Ma, but an adhesive that does not melt may be used.

  As shown in FIG. 9A, the warps 22a and 22b are arranged in the body portion 13 and the dome portion 14 along the axial direction Y of the liner 12, and the start end portion 19a extends over the entire axial direction of the liner 12. It is fixed to the liner 12 so as to extend.

  While the liner 12 is not rotated, the collar frames 31a and 31b are alternately moved in the vertical direction, whereby the one collar frame 31a and the other collar frame 31b are moved in the opposite directions. The adjacent warps 22a and 22b are alternately opened up and down, and the weft 23 is inserted (inserted) into the warp opening 37 formed each time. The weft 23 to be inserted is a flat shape.

  Then, the weft 23 is inserted, the beating operation of the reed 34 is performed, the reed frames 31a and 31b are moved in the reverse direction, the opening state is changed, and the next weft inserting operation is performed. By repeating these operations, a part of the fabric 24 in which the warp 22 and the weft 23 are plain woven is woven, and a state in which a part of the fabric 24 is integrated with the liner 12 is formed.

  As shown in FIG. 9B, the weft 23 is fed toward the starting end 19a by the beating operation of the reed 34. The flange 34 is a member that extends linearly in the axial direction of the liner 12. For this reason, when the weft 23 is beaten, the dome portion 14 has a smaller diameter than the body portion 13, so the weft 23 arranged in the dome portion 14 is pushed from the portion arranged in the body portion 13. It is crushed and deformed to increase its thickness. As a result, even with the body portion 13 and the dome portion 14 having different diameters, the wefts 23 are arranged in the circumferential direction of the liner 12 in parallel with each other due to the deformation of the wefts 23.

  Thereafter, as shown in FIG. 9C, the woven fabric 24 is woven in the same manner as described above while rotating the liner 12 around the central axis L and winding the woven fabric 24 around the liner 12. As a result, the fabric 24, that is, the reinforcing fiber sheet 19 is wound around the liner 12 so as to cover the entire dome portion 14 and the trunk portion 13. And the fiber structure 21 provided with the reinforced fiber sheet 19 in the outer peripheral surface of the liner 12 is manufactured by winding until the textile fabric 24 becomes the required number of lamination | stacking.

  In the fiber structure 21 configured as described above, the fiber reinforced composite material layer 11 is formed from the reinforcing fiber sheet 19 by impregnating and curing the matrix resin Ma, and the outer side of the liner 12 is the fiber reinforced composite material layer 11. The covered high-pressure tank 10 is manufactured. The matrix resin Ma is impregnated and cured by, for example, an RTM (resin transfer molding) method.

Next, the operation of the high-pressure tank 10 will be described.
The high-pressure tank 10 is used as a hydrogen source of a fuel cell of a fuel cell vehicle, for example. The high-pressure tank 10 is used in a state where a pipe (not shown) is connected to the valve 17, and hydrogen gas is filled into the high-pressure tank 10 from the filling pipe when filling with hydrogen gas. The high-pressure tank 10 is filled with hydrogen gas so as to have a pressure of several tens of MPa, for example.

  When the high-pressure tank 10 is filled with hydrogen gas, the pressure in the high-pressure tank 10 increases and the liner 12 is pressed from the inside. A large force in the axial direction Y and the radial direction acts on the liner 12 to generate an internal pressure stress. In this embodiment, the liner 12 is reinforced in the axial direction by the wefts 23, and the liner 12 is reinforced in the radial direction by the warps 22, and deformation of the high-pressure tank 10 is suppressed.

According to the above embodiment, the following effects can be obtained.
(1) The high-pressure tank 10 includes a butt surface 12 a extending radially outward from the outer peripheral surface of the liner 12, and the height H of the butt surface 12 a matches the thickness of the start end portion 19 a of the reinforcing fiber sheet 19. For this reason, the thickness of the start end 19a is absorbed by butting the start end 19a of the reinforcing fiber sheet 19 to the butting surface 12a, and the winding surfaces positioned on both sides of the butting surface 12a in the circumferential direction of the liner 12 It becomes difficult to form a step between 12b and the peripheral surface of the reinforcing fiber sheet 19. For this reason, even if it is the fiber structure 21 formed by winding the reinforcing fiber sheet 19 around the starting end portion 19a of the reinforcing fiber sheet 19, distortion due to the starting end portion 19a can be suppressed. As a result, a decrease in pressure resistance of the high-pressure tank 10 due to the distortion of the fiber structure 21 can be suppressed.

  (2) In the liner 12, the position where the winding surface 12b and the circle C along the outer peripheral surface of the liner 12 intersect is a position where the radius changes. For this reason, the reinforcing fiber sheet 19 wound around the liner 12 is distorted to extend in the axial direction of the liner 12. However, the winding surface 12 b is formed so as to be inclined by 2 degrees with respect to the circle C on the outer peripheral surface of the liner 12. For this reason, even if distortion occurs in the reinforcing fiber sheet 19, it is possible to suppress a decrease in strength due to the distortion.

  (3) The liner 12 includes a butting surface 12 a and a winding surface 12 b in the body portion 13 and both dome portions 14. For this reason, in the entire axial direction of the liner 12, a step is hardly formed between the winding surface 12 b located on both sides of the butting surface 12 a in the circumferential direction of the liner 12 and the peripheral surface of the reinforcing fiber sheet 19.

  (4) In the fiber structure 21 constituting the high-pressure tank 10, the yarn main shaft direction X <b> 2 of the weft 23 extends in the axial direction Y of the body portion 13 and the dome portion 14. For this reason, the liner 12 can be reinforced in the axial direction by the weft 23.

  (5) The yarn main axis direction X2 of the weft 23 extends in the axial direction Y along the curved surface of the dome portion 14 of the liner 12. For this reason, the weft 23 does not incline with respect to the axial direction Y at the dome portion 14, and even the dome portion 14 can be reinforced in the axial direction.

  (6) The butting surface 12a and the winding surface 12b are integrally formed when the liner 12 is formed. For this reason, compared with the case where the butt | matching surface 12a and the winding surface 12b are provided with components different from the liner 12, the butt | matching surface 12a and the winding surface 12b can be arrange | positioned in the desired place.

  (7) As a method of manufacturing the fiber structure 21 including the reinforcing fiber sheet 19 outside the liner 12, there is filament winding. However, this method has low productivity because the yarn is wound around the liner 12 one by one. In this embodiment, since the fabric 24 is wound around the liner 12 while weaving the fabric 24 with the warp 22 and the weft 23, the productivity can be improved as compared with the filament winding.

In addition, you may change the said embodiment as follows.
As shown in FIG. 10, a spacer 38 separate from the liner 12 may be integrated with the outer peripheral surface of the liner 12, and the abutting surface 12 a and the winding surface 12 b may be provided by the spacer 38. According to this, since there is no place where the thickness of the liner 12 changes, a change in the strength of the liner 12 can be suppressed.

  As shown in FIG. 11, a part of the outer peripheral surface of the liner 12 is recessed from the circle C in an arc shape, and a winding surface 12 b is formed in a portion recessed in the arc shape, and the winding surface 12 b and the circle The abutting surface 12a may be formed on the stepped surface formed with the boundary with C. In this case, the radius of the winding surface 12 b is smaller than the radius of the circle C along the outer peripheral surface of the liner 12.

  The start end portion 19a of the reinforcing fiber sheet 19 is formed by the tip portions of a plurality of warps 22, but is not limited thereto. For example, when the reinforcing fiber sheet 19 is woven by a weave weave, the start end portion 19 a is formed by a thread extending in the axial direction of the liner 12.

The butting surface 12 a and the winding surface 12 b may be provided only on the body portion 13 of the liner 12.
The reinforcing fiber sheet 19 may be formed of only yarns extending in the axial direction of the liner 12.

  The reinforcing fiber sheet 19 may be a prepreg in which a fiber base material is pre-impregnated with a resin instead of the woven fabric 24. In this case, after manufacturing the fiber structure 21 by winding the reinforced fiber sheet 19 made of prepreg around the liner 12, the fiber structure 21 and the matrix resin Ma are heated by heating the fiber structure 21 and curing the resin. The fiber reinforced composite material layer 11 is formed by compounding, and the high-pressure tank 10 is manufactured.

  In the embodiment, the reinforcing fiber sheet 19 is configured by laminating the woven fabric 24 woven by plain weaving, but is not limited thereto. For example, the reinforcing fiber sheet 19 has a structure in which a plurality of warp yarns 22 as first yarns and a plurality of weft yarns 23 as second yarns are laminated and weaved by weaving satin or twill. There may be.

In the embodiment, the first yarn is the warp yarn 22 and the second yarn is the weft yarn 23, but the first yarn may be the weft yarn 23 and the second yarn may be the warp yarn 22.
The liner 12 may have a shape in which the dome portion 14 is continuous with one end side in the axial direction Y of the body portion 13 and a flat bottom wall is continuous on the other end side in the axial direction Y of the body portion 13. . In this case, the base part 15 exists only on one end side in the axial direction Y where the dome part 14 exists.

The entire liner 12 may be made of aluminum alloy instead of aluminum, or the base portion 15 may be made of a metal different from stainless steel.
The liner 12 may be a united body part 13 and dome part 14, which are separate bodies.

  The high-pressure tank 10 is not limited to the one used as a hydrogen source for an electric vehicle equipped with a fuel cell. For example, the high-pressure tank 10 may be applied to a hydrogen source of a hydrogen engine, a heat pump, or the like. Moreover, you may use as a hydrogen source of the fuel cell of a household power supply.

  O It may apply not only to the high pressure tank which stores hydrogen as a pressure vessel but to a pressure vessel which stores other gas, such as nitrogen and compressed natural gas, for example.

  DESCRIPTION OF SYMBOLS 10 ... High pressure tank as a pressure vessel, 12 ... Liner, 12a ... Butt | matching surface, 12b ... Winding surface, 13 ... Body part, 14 ... Dome part, 19 ... Reinforcement fiber sheet, 19a ... Start end part, 21 ... Fiber structure, 22 ... Warp yarn as first yarn, 23 ... Weft yarn as second yarn, 24 ... Woven fabric, 38 ... Spacer.

Claims (7)

A cylindrical body,
And having a liner comprising a dome portion continuous with at least one end in the axial direction of the body portion,
The reinforcing fiber sheet is wound around the outer peripheral surface of the liner along the circumferential direction of the liner, and covers the liner from the outside,
The reinforcing fiber sheet is a fiber structure including reinforcing fiber yarns arranged in the body portion so that a yarn main axis direction extends in at least one of a circumferential direction and an axial direction of the liner,
The reinforcing fiber sheet has a starting end portion that extends in the axial direction of the liner and starts to be wound on the liner,
The liner includes at least a butting surface extending in the axial direction and the radial direction of the body portion;
An arcuate winding surface that is continuous with the abutting surface and has a radius different from the radius of the outer peripheral surface of the body portion;
The height of the butting surface along the radial direction of the body portion matches the thickness of the reinforcing fiber sheet,
A fiber structure, wherein a starting end portion of the reinforcing fiber sheet is butted against the butted surface, and a part of the reinforcing fiber sheet is wound around the winding surface.   2. The fiber structure according to claim 1, wherein the winding surface has an angle of greater than 0 degree and less than or equal to 2 degrees with respect to the outer peripheral surface of the body portion.   The fiber structure according to claim 1 or 2, wherein the liner includes the butt surface and the winding surface also in the dome portion. The reinforcing fiber sheet is made of woven fabric, and a first thread arranged in the body part and the dome part so that a thread main axis direction extends in a circumferential direction of the liner,
The first yarn and the second yarn forming the fabric,
The second yarns are arranged so that the yarn main axis direction extends in the axial direction of the body portion, and the yarn main axis direction of the portion arranged in the dome portion extends in the axial direction of the dome portion. The fiber structure as described in any one of Claims 1-3 which are made.   The said abutting surface and the said winding surface are the fiber structures as described in any one of Claims 1-4 currently formed in the said liner.   The fiber structure according to any one of claims 1 to 4, wherein the butting surface and the winding surface are provided by integrating a spacer with the liner. A fiber structure comprising a reinforcing fiber sheet covering the liner from the outside;
A pressure vessel in which a matrix resin and the fiber structure are combined,
The pressure container, wherein the fiber structure is the fiber structure according to any one of claims 1 to 6.