JP7111049B2 - Textile structures and pressure vessels - Google Patents

Description

TECHNICAL FIELD The present invention relates to a fiber structure and a pressure vessel having a fiber-reinforced base material covering the body portion and the dome portion of the liner from the outside.

In recent years, automobiles that use natural gas as fuel have attracted attention as low-pollution vehicles, and automobiles that use fuel cells as a power source have also attracted attention as low-pollution vehicles. There are automobiles that contain hydrogen gas as fuel for the fuel cell in the fuel tank, but the weight of the pressure vessel serving as the fuel tank is heavy, resulting in poor fuel efficiency. In order to solve this problem, a pressure vessel has been proposed in which a gas barrier liner (inner shell) is covered with a pressure-resistant fiber-reinforced composite material layer.

In such a pressure vessel, the liner generally has a curved dome portion on both ends in the direction in which the central axis of the cylindrical body extends (hereinafter referred to as the axial direction). The pressure vessel is filled with gas to a pressure of several tens of MPa, and the liner is reinforced with a fiber-reinforced composite material layer.

When such a pressure vessel is filled with high-pressure gas during use, a large internal pressure acts on the liner. This internal pressure applies a load to the liner, but since the magnitude and direction of the applied load are different between the body and the dome, the fiber-reinforced composite material layer tends to be distorted near the boundary between the body and the dome. . Due to this strain, an interlaminar shear stress is generated between the fiber reinforced composite material layers, delamination of the fiber reinforced composite material layers may occur, and the strength of the pressure vessel may be reduced. In order to suppress the decrease in the strength of the pressure vessel due to this delamination, for example, in Patent Document 1, a pin penetrating the fiber reinforced composite material layer is provided near the boundary between the body portion and the dome portion, Suppresses peeling.

JP 2010-249146 A

However, in Patent Literature 1, a pin is required to suppress delamination in the fiber-reinforced composite material layer, which increases the number of parts and increases the manufacturing cost.
An object of the present invention is to provide a fiber structure and a pressure vessel capable of suppressing delamination in fiber-reinforced composite material layers without increasing the number of parts.

A fiber structure for solving the above problems includes a cylindrical body, and a shape that is continuous with the body along the axial direction in which the central axis of the body extends and tapers toward the central axis. and a mouthpiece provided at the tapering tip of the dome portion, and a fiber-reinforced base material covering the body portion and the dome portion of the liner from the outside. A pressure vessel that reinforces the liner with a fiber-reinforced composite material layer in which the fiber-reinforced base material is impregnated with a matrix resin and cured, and the fiber-reinforced base material extends in the circumferential direction of the liner and in the yarn main axis direction. and a second fiber bundle forming a woven fabric together with the first fiber bundle. When the boundary with the dome portion is defined as a boundary, the fiber-reinforced base material has, as the first fiber bundles, high-elasticity fiber bundles having a higher elastic modulus than the other first fiber bundles, and the other first fiber bundles. The gist is that a low-elasticity fiber bundle having a lower modulus of elasticity than the high-elasticity fiber bundle is included as the bundle, and the high-elasticity fiber bundle is arranged in the body portion including the boundary.

According to this, in the vicinity of the boundary of the liner, the portion closer to the body portion from the boundary along the axial direction has a dimension in the direction perpendicular to the axial direction of the liner (hereinafter referred to as the radial direction) larger than that of the dome portion. It is a portion where a large internal pressure stress acts, and moreover, it is a portion where the radial dimension of the liner changes from that of the dome portion, and is a portion that is easily deformed by the internal pressure. By arranging the high-elasticity fiber bundles so as to include this easily deformable boundary, the rigidity of the fiber-reinforced composite material layer of the pressure vessel near the body portion is increased, and when the internal pressure is received by the fiber-reinforced composite material layer, deformation of the liner can be suppressed.

In addition, the portion closer to the dome than the boundary along the axial direction is the portion where the dimension in the radial direction of the liner is smaller than that of the body, and compared to the body, it is a portion that is less likely to deform due to internal pressure. be.

Therefore, in the vicinity of the boundary of the liner, highly elastic fiber bundles are arranged in the body part so as to include the boundary. Therefore, it is possible to suppress the occurrence of a large difference in the amount of deformation between the body portion and the dome portion, and suppress the force that tends to bend the vicinity of the boundary. As a result, the moment generated near the boundary can be suppressed, the interlaminar shear stress generated in the fiber reinforced composite material layer due to the moment can be suppressed, and the occurrence of delamination in the fiber reinforced composite material layer can be suppressed.

Therefore, the occurrence of delamination in the fiber-reinforced composite material layer can be suppressed only by adjusting the elastic modulus of the first fiber bundle that forms the fiber-reinforced base material. It is possible to suppress the occurrence of delamination in the fiber-reinforced composite material layer without requiring the addition of.

Further, with respect to the fiber structure, the low-elasticity fiber bundle includes a first low-elasticity fiber bundle having a lower elastic modulus than the high-elasticity fiber bundle, and a higher elastic modulus than the first low-elasticity fiber bundle, and In the fiber-reinforced base material, the dome portion includes the low-elasticity fiber bundle adjacent to the high-elasticity fiber bundle along the axial direction. The first low-elasticity fiber bundles are arranged as fiber bundles, and the second low-elasticity fiber bundles are arranged as the low-elasticity fiber bundles adjacent to the high-elasticity fiber bundles in the body portion along the axial direction. In the dome portion, the second low-elasticity fiber bundles may be arranged as the low-elasticity fiber bundles adjacent to the first low-elasticity fiber bundles along the axial direction.

According to this, the boundary of the liner is a place where the radial dimension of the liner is smaller than that of the body portion, where the radial dimension of the liner changes, and where it is difficult to deform under internal pressure. be. Among the low-elasticity fiber bundles, the first low-elasticity fiber bundles having a lower modulus of elasticity than the second low-elasticity fiber bundles are arranged in this portion that is difficult to deform, thereby allowing deformation when subjected to internal pressure. Therefore, when the pressure vessel receives internal pressure, it is possible to suppress a large difference in the amount of deformation of the liner on both sides of the boundary, and to suppress the force that tends to bend the vicinity of the boundary. As a result, the moment generated near the boundary can be suppressed, the interlaminar shear stress generated in the fiber reinforced composite material layer due to the moment can be suppressed, and the occurrence of delamination in the fiber reinforced composite material layer can be suppressed.

Further, in the body portion and the dome portion of the liner, the second low-elasticity fiber bundles are arranged except for the portions where the high-elasticity fiber bundles and the first low-elasticity fiber bundles are arranged. can be radially reinforced.

Further, with respect to the fiber structure, in the fiber-reinforced base material, the high-elasticity fiber bundles are arranged in the body portion and the dome portion sandwiching the boundary along the axial direction, and the body portion and the dome portion The low-elasticity fiber bundles may be arranged in the remaining portion.

According to this, high-elasticity fiber bundles were arranged on both sides across the boundary along the axial direction. The vicinity of the boundary is a place where the dimension of the liner in the radial direction changes, and is a portion that is likely to deform due to internal pressure. In a pressure vessel, by arranging high-elasticity fiber bundles in easily deformable portions, the rigidity of the fiber-reinforced composite material layer is increased, and deformation when subjected to internal pressure can be suppressed.

Further, with respect to the fiber structure, in the fiber-reinforced base material, the high-elasticity fiber bundles are arranged along the axial direction from the body portion to the mouthpiece, and the low-elasticity fiber bundles are arranged in the body portion. may be arranged.

According to this, since the fiber-reinforced base material is composed of two types of high-elasticity fiber bundles and low-elasticity fiber bundles, it is possible to suppress the occurrence of delamination in the fiber-reinforced composite material layer with a simple configuration.
Further, with respect to the fiber structure, the fiber-reinforced base material may have a structure in which a fabric woven by weaving the first fiber bundle and the second fiber bundle is wound around the liner.

According to this, filament winding is a method for producing a fiber-reinforced base material on the outside of the liner. With this method, the productivity is low because the fiber bundles are wound around the liner one by one. However, a method of winding the fabric around the liner while weaving the fabric from the first fiber bundle and the second fiber bundle can improve productivity compared to filament winding.

A pressure vessel for solving the above problems has a cylindrical body, and a shape that is continuous with the body along the axial direction in which the central axis of the body extends and tapers toward the central axis. A fiber structure comprising a liner having a dome portion and a mouthpiece portion provided at a tapering tip of the dome portion, and having a fiber-reinforced base material covering the body portion and the dome portion of the liner from the outside. and wherein the liner is reinforced by a fiber-reinforced composite material layer obtained by impregnating and curing the fiber-reinforced base material with a matrix resin, wherein the fiber structure is any one of claims 1 to 5 The gist is that it is the fiber structure according to the above item.

According to this, in the vicinity of the boundary of the liner, the portion closer to the body portion from the boundary along the axial direction has a dimension in the direction perpendicular to the axial direction of the liner (hereinafter referred to as the radial direction) larger than that of the dome portion. It is a portion where a large internal pressure stress acts, and moreover, it is a portion where the radial dimension of the liner changes from that of the dome portion, and is a portion that is easily deformed by the internal pressure. By arranging the high-elasticity fiber bundles so as to include this easily deformable boundary, the rigidity of the fiber-reinforced composite material layer of the pressure vessel near the body portion is increased, and when the internal pressure is received by the fiber-reinforced composite material layer, deformation of the liner can be suppressed.

In addition, the portion closer to the dome than the boundary along the axial direction is the portion where the dimension in the radial direction of the liner is smaller than that of the body, and compared to the body, it is a portion that is less likely to deform due to internal pressure. This is a portion with a small amount of deformation.

Therefore, in the pressure vessel, high-elasticity fiber bundles are arranged in the body portion including the boundary along the axial direction, and the high-elasticity fiber bundles suppress deformation of the liner when subjected to internal pressure. As a result, it is possible to suppress the occurrence of a large difference in the amount of deformation between the body portion and the dome portion, and suppress the force that tends to bend the vicinity of the boundary. As a result, the moment generated near the boundary can be suppressed, the interlaminar shear stress generated in the fiber reinforced composite material layer due to the moment can be suppressed, and the occurrence of delamination in the fiber reinforced composite material layer can be suppressed.

Therefore, the occurrence of delamination in the fiber-reinforced composite material layer can be suppressed only by adjusting the elastic modulus of the first fiber bundle that forms the fiber-reinforced base material. It is possible to suppress the occurrence of delamination in the fiber-reinforced composite material layer without requiring the addition of.

ADVANTAGE OF THE INVENTION According to this invention, the delamination in a fiber reinforced composite material layer can be suppressed, without increasing components.

Sectional drawing which shows a high pressure tank typically. The perspective view which shows a fiber structure typically. The front view which shows a fiber-reinforced base material typically. The figure which shows the body part and dome part of a high-pressure tank. Sectional drawing which shows the body part and dome part of a high-pressure tank. The figure which shows typically the manufacturing method of the fiber structure by a loom. (a) is a diagram schematically showing the state in which the weft yarn is inserted, (b) is a diagram schematically showing the state after the beating operation, and (c) is the state in which the fiber reinforced base material is wound around the liner. The figure shown typically. The figure which shows the body part and dome part of the high-pressure tank of another example. Sectional drawing which shows the body part and dome part of the high pressure tank of example of another. The figure which shows the body part and dome part of the high-pressure tank of another example. Sectional drawing which shows the body part and dome part of the high pressure tank of example of another.

An embodiment in which the fiber structure and the pressure vessel are embodied in a high-pressure tank will be described below with reference to FIGS. 1 to 7. FIG.
As shown in FIG. 1, a high pressure tank 10 as a pressure vessel includes a fiber reinforced base material 19 in a fiber structure 21 having an elongated hollow liner 12 and a fiber reinforced base material 19 covering the outside of the liner 12. It is constructed by impregnating and curing a matrix resin (indicated by dot hatching). The high-pressure tank 10 has a liner 12 reinforced by a fiber-reinforced composite material layer 11 made of a fiber-reinforced base material 19 impregnated with a matrix resin and cured to ensure pressure resistance (mechanical strength) of the high-pressure tank 10 .

The liner 12 is made of resin and has an elongated hollow shape. An axial direction Y is the direction in which the center axis L of the liner 12 extends. The liner 12 has a cylindrical body 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 . In addition, the liner 12 is provided with a base portion 15 on the tip side of each dome portion 14 .

The fiber structure 21 comprises carbon fibers as reinforcing fibers in this embodiment. The reinforcing fibers are not limited to carbon fibers, and glass fibers, silicon carbide ceramic fibers, aramid fibers, ultra-high molecular weight polyethylene fibers, and the like may be used.

As shown in FIG. 2 or 3, the fiber structure 21 is a fabric 24 woven by plain weaving a plurality of warp yarns 22 as a first fiber bundle and a plurality of weft yarns 23 as a second fiber bundle. is wound and laminated. The warp yarns 22 and the weft yarns 23 are arranged perpendicular to each other. A plurality of warp yarns 22 are arranged in the body portion 13 and each dome portion 14 in parallel to each other in the axial direction Y of the liner 12 . The yarn main axis direction X1 of each warp yarn 22 extends linearly in the circumferential direction X of the liner 12 in the body portion 13 and the dome portion 14 . In addition, in the liner 12, the direction perpendicular to the central axis L of the liner 12 is defined as the radial direction Z. As shown in FIG.

The plurality of weft yarns 23 are arranged parallel to each other in the circumferential direction X of the liner 12 . The warp yarns 22 and the weft yarns 23 are arranged orthogonally. The liner 12 is reinforced in the axial direction Y by matching the direction X2 with the axial direction Y of the liner 12 .

As shown in FIG. 1 , each dome portion 14 has a shape that tapers toward the tip of each dome portion 14 along the axial direction Y of the liner 12 . The liner 12 has a boundary R extending along the entire circumferential direction of the liner 12 at the boundary between the body portion 13 and each dome portion 14 along the axial direction Y of the liner 12 . The dimension of the liner 12 along the radial direction Z is the outer diameter of the liner 12 . The boundary R exists at a position where the outer diameter of the liner 12 becomes smaller in the direction from the body portion 13 toward the dome portion 14 .

Each base portion 15 is made of metal (for example, made of stainless steel). Each base portion 15 has a connection portion 15 a with the dome portion 14 and a hole portion 15 b communicating with the space inside the liner 12 . A valve (not shown) is mounted in the hole 15b of the mouthpiece 15 on the one end side in the axial direction Y of the liner 12, and a screw (not shown) is fitted in the hole 15b of the mouthpiece 15 on the other end side in the axial direction Y of the liner 12. not shown) are screwed together and closed. The outer surface of the connecting portion 15a of each base portion 15 is curved, and the outer surface of the connecting portion 15a constitutes a part of the outer surface of the dome portion 14. As shown in FIG.

As shown by the dashed line in FIG. 2 or the dashed line in FIG. 4, the fiber-reinforced base material 19 has highly elastic warp threads 22a as the warp threads 22 arranged on the body portion 13 so as to include the boundary R. The high-elasticity warp yarns 22 a are fiber bundles having a high elastic modulus among carbon fibers, and are high-elasticity fiber bundles having a higher elastic modulus than other carbon fibers covering the liner 12 . As the highly elastic warp yarns 22a, it is preferable to use fiber bundles having an elastic modulus of 300 to 350 GPa. The range in which the highly elastic warp yarns 22a are arranged may be a range capable of suppressing deformation when the liner 12 receives internal pressure and a load is applied. The fiber-reinforced base material 19 has a high-elasticity warp portion K1 as a portion in which the high-elasticity warp yarns 22a are arranged in the trunk portion 13 .

As shown by the dashed line in FIG. 4, the fiber reinforced base material 19 is arranged in a portion of the dome portion 14 along the axial direction Y from the high-elasticity warp portion K1 toward the base portion 15 as the first warp yarns 22. It has low elastic warp yarns 22b. The first low-elasticity warp yarns 22b are low-elasticity fiber bundles made of carbon fibers having a lower elastic modulus than the high-elasticity warp yarns 22a. As the first low-elasticity warp yarns 22b, it is preferable to use fiber bundles having an elastic modulus of 200 to 280 GPa.

The first low-elasticity warp yarns 22b are arranged adjacent to the high-elasticity warp yarns 22a along the axial direction Y and over a portion of the dome portion 14 from the boundary R. The fiber-reinforced base material 19 has a first low-elasticity warp portion K2 as a portion in which the first low-elasticity warp yarns 22b are arranged in a portion of the dome portion 14. The first low-elasticity warp portion K2 is along the axial direction Y of the high-elasticity warp portion K1. On both sides of the boundary R in the axial direction Y, the high elastic warp portion K1 and the first low elastic warp portion K2 are positioned.

As shown by the solid line in FIG. 4, the fiber-reinforced base material 19 includes the second low-elasticity warp yarns 22c as the warp yarns 22 arranged in the liner 12 other than the portion where the high-elasticity warp yarns 22a and the first low-elasticity warp yarns 22b are arranged. Prepare. The second low-elasticity warp yarns 22c are arranged in the remaining part of the dome part 14 from the part where the first low-elasticity warp yarns 22b are arranged to the base part 15, It is arranged so as to be adjacent to the first low-elasticity warp yarns 22b of the one low-elasticity warp portion K2. The second low-elasticity warp yarns 22c are arranged in the body portion 13 between the high-elasticity warp yarns 22a on both sides in the axial direction Y of the liner 12, and are adjacent to the high-elasticity warp yarns 22a of each high-elasticity warp portion K1. are arranged as

The second low-elasticity warp yarns 22c are low-elasticity fiber bundles made of carbon fibers having a higher elastic modulus than the first low-elasticity warp yarns 22b and a lower elastic modulus than the high-elasticity warp yarns 22a. As the second low-elasticity warp yarns 22c, it is preferable to use fiber bundles having an elastic modulus of 280 to 300 GPa. The fiber-reinforced base material 19 has a second low-elasticity warp portion K3 as a portion in which the second low-elasticity warp yarns 22c are arranged in a portion of the body portion 13 and a portion of the dome portion 14 . The second low-elasticity warp portion K3 provided in the body portion 13 is continuous with the high-elasticity warp portion K1 along the axial direction Y of the liner 12, and the second low-elasticity warp portion K3 provided in the dome portion 14 is It is continuous with the first low-elasticity warp portion K2 along the axial direction Y of the liner 12 .

As shown in FIG. 5, in the present embodiment, the high-pressure tank 10 has a second low-elasticity warp portion K3, a first low-elasticity warp portion K2, and a high-elasticity warp portion K1 from one end to the other end in the axial direction Y. , the second low-elasticity warp portion K3, the high-elasticity warp portion K1, the first low-elasticity warp portion K2, and the second low-elasticity warp portion K3. A portion closer to the trunk portion 13 than both boundaries R in the axial direction Y has the highest rigidity due to the high-elasticity warp yarns 22a, and a portion closer to the dome portion 14 than both boundaries R has the highest rigidity due to the first low-elasticity warp yarns 22b. Rigidity is low.

Next, a method for manufacturing the high-pressure tank 10 will be described.
When manufacturing the high-pressure tank 10, the high-elasticity warp yarns 22a, the first low-elasticity warp yarns 22b, and the second low-elasticity warp yarns 22c as the warp yarns 22 and the weft yarns 23 are plain-woven, and the manufactured fabric 24 is placed on the liner 12. I'm going to wrap it around. In the following description, the high-elasticity warp yarns 22a, the first low-elasticity warp yarns 22b, and the second low-elasticity warp yarns 22c will be collectively referred to as the warp yarns 22, and if necessary, the warp yarns 22 will be referred to as the high-elasticity warp yarns 22a, In some cases, the first low-elasticity warp yarn 22b and the second low-elasticity warp yarn 22c are specified for explanation.

As shown in FIG. 6, the fabric 24 is woven, for example, by a plain loom equipped with two heald frames 31a and 31b for shedding the vertically arranged warp yarns 22. As shown in FIG. As shown in FIG. 7(a), a plurality of warp yarns 22 are arranged along the axial direction Y of the liner 12. , the high-elasticity warp yarns 22a are arranged, and the first low-elasticity warp yarns 22b are arranged in the portion forming the first low-elasticity warp portion K2. Further, among the plurality of warps 22, second low-elasticity warp yarns 22c are arranged in a portion forming the second low-elasticity warp portion K3.

As shown in FIG. 6, the plain loom has a structure in which a warp beam 32 that supplies one of the upper and lower warp yarns 22 and a warp beam 33 that supplies the other of the upper and lower warp yarns 22 are arranged vertically. have. The warp yarns 22 delivered from one warp beam 32 are shed by one heald frame 31a, and the warp yarns 22 delivered from the other warp beam 33 are shed by the other heald frame 31b. . The meshes of the heald frames 31a and 31b are indicated by black circles in the figure. The reed 34 is arranged between the heald frames 31 a and 31 b and the cloth fell 35 . The weft yarn 23 is inserted (inserted) into the opening between the vertically divided warp yarns 22 by a weft insertion mechanism (not shown). The liner 12 is rotatably supported ahead of the cloth fell 35 in the feeding direction of the warp yarns 22 . The liner 12 rotates about the central axis L as the center of rotation.

When the fiber-reinforced base material 19 is woven with the above plain loom, as shown in FIG. For example, it is fixed by a fixing member 36 made of adhesive tape. The warp yarns 22 are arranged in the body portion 13 and the dome portion 14 along the axial direction Y of the liner 12 . Specifically, the warp yarns 22 are arranged in the order of the second low-elasticity warp yarns 22c, the first low-elasticity warp yarns 22b, the high-elasticity warp yarns 22a, and the second low-elasticity warp yarns 22c from one end in the axial direction Y of the liner 12 to the central portion. , from the central portion in the axial direction Y to the other end in the axial direction Y, the second low-elasticity warp yarns 22c, the high-elasticity warp yarns 22a, the first low-elasticity warp yarns 22b, and the second low-elasticity warp yarns 22c are arranged in this order.

By alternately moving the heald frames 31a and 31b vertically without rotating the liner 12, the one heald frame 31a and the other heald frame 31b are moved in opposite directions. Adjacent warp yarns 22 are alternately opened vertically, and the weft yarn 23 is inserted into the warp opening 37 formed each time.

Then, the weft yarn 23 is inserted, the reed 34 is beaten, the heddle frames 31a and 31b are moved in the opposite direction to change the open state, and the next weft insertion operation is performed. These operations are repeated to partially weave the fabric 24 in which the warp yarns 22 and the weft yarns 23 are plain woven, and form a state in which the fabric 24 is partially integrated with the liner 12 .

As shown in FIG. 7(b), the weft yarn 23 is sent toward the fixing member 36 by the beating action of the reed 34. As shown in FIG.
Thereafter, as shown in FIG. 7(c), the liner 12 is rotated about the central axis L to wind the fabric 24 around the liner 12, and the fabric 24 is continuously weaved in the same manner as described above. As a result, the fabric 24 is wound around the liner 12 so as to cover the entire dome portion 14 and body portion 13 . The fiber reinforced base material 19 is manufactured on the outer peripheral surface of the liner 12 by winding the woven fabric 24 until the required number of layers is obtained, and the fiber structure is obtained by covering the outer surface of the liner 12 with the fiber reinforced base material 19. 21 is produced.

As for the fiber reinforced base material 19 of the fiber structure 21, a highly elastic warp portion K1 is formed in a portion near the trunk portion 13 including the boundary R, and a portion near the mouthpiece portion 15 is formed adjacent to the highly elastic warp portion K1. A first low-elasticity warp portion K2 is formed in a portion of the dome portion 14 . Further, a second low-elasticity warp portion K3 is formed in a portion of the liner 12 other than the high-elasticity warp portion K1 and the first low-elasticity warp portion K2.

By impregnating and curing the matrix resin in the fiber structure 21 configured as described above, the matrix resin is impregnated and cured in the fiber reinforced base material 19, and the fiber reinforced composite material layer 11 is formed on the outside of the liner 12. A high-pressure tank 10 is manufactured in which the outside of 12 is covered with a fiber-reinforced composite material layer 11 . The impregnation curing of the matrix resin is performed, for example, by the RTM (resin transfer molding) method.

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

When the high-pressure tank 10 is filled with hydrogen gas, the pressure inside the high-pressure tank 10 increases, and the liner 12 is pressed from the inside. A load is applied to the liner 12 in the axial direction Y and the radial direction Z, and internal pressure stress is generated. In this embodiment, the weft yarns 23 reinforce the liner 12 in the axial direction Y, and the warp yarns 22 reinforce the liner 12 in the radial direction Z, thereby suppressing deformation of the high-pressure tank 10 .

According to the above embodiment, the following effects can be obtained.
(1) In the vicinity of the boundary R in the liner 12, the portion closer to the body portion 13 than the boundary R along the axial direction Y is a portion that is easily deformed by the load due to the internal pressure. In this easily deformable portion, the highly elastic warp yarns 22a are arranged so as to include the boundary R to provide a highly elastic warp yarn portion K1, thereby increasing the rigidity of the fiber-reinforced composite material layer 11 and suppressing the deformation of the liner 12. . On the other hand, the portion closer to the dome portion 14 than the boundary R along the axial direction Y is a portion that is less deformable than the portion closer to the body portion 13 . Therefore, in the vicinity of the boundary R, the highly elastic warp portion K1 suppresses a large difference in the amount of deformation between the body portion 13 and the dome portion 14, thereby suppressing the force that tends to bend the vicinity of the boundary R. As a result, the moment generated near the boundary R can be suppressed, the interlaminar shear stress in the fiber reinforced composite material layer 11 caused by the moment can be suppressed, and the occurrence of delamination in the fiber reinforced composite material layer 11 can be suppressed.

(2) A portion near the dome portion 14 in the vicinity of the boundary R is a portion that is less likely to deform due to internal pressure. The first low-elasticity warp portion K2 is provided in this hard-to-deform portion so that the deformation of the liner 12 is not strongly suppressed. By arranging the high-elasticity warp portion K1 and the first low-elasticity warp portion K2 across the boundary R, a large difference in the amount of deformation of the liner 12 is suppressed, and the force that tends to bend the vicinity of the boundary R is reduced. can be suppressed. As a result, the moment generated near the boundary R can be suppressed, the interlaminar shear stress in the fiber reinforced composite material layer 11 caused by the moment can be suppressed, and the occurrence of delamination in the fiber reinforced composite material layer 11 can be suppressed.

(3) The body portion 13 and the dome portion 14 are provided with the second low-elasticity warp portions K3 in which the second low-elasticity warp yarns 22c are arranged. The second low-elasticity warp portion K3 can reinforce the portion of the liner 12 other than the high-elasticity warp portion K1 and the first low-elasticity warp portion K2.

(4) Filament winding is a method for manufacturing the fiber structure 21 having the fiber-reinforced base material 19 on the outside of the liner 12 . However, in this method, the yarn is wound around the liner 12 one by one, resulting in low productivity. In this embodiment, the fabric 24 is woven with the warp yarns 22 and the weft yarns 23, and the fabric 24 is made into a liner by changing the type of the warp yarns 22 to the high-elasticity warp yarns 22a, the first low-elasticity warp yarns 22b, and the second low-elasticity warp yarns 22c. 12, productivity can be improved compared to filament winding.

This embodiment can be implemented with the following modifications. This embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
○ As shown in FIG. 8 or FIG. 9 , the fiber-reinforced base material 19 has highly elastic warp yarns 22 a arranged from a portion closer to the trunk portion 13 than the boundary R to the mouthpiece portion 15 . The highly elastic warp yarns 22a are arranged along the axial direction Y from the body portion 13 to the mouthpiece portion 15 across the boundary R, and are arranged so as to include the boundary R. The fiber-reinforced base material 19 has a highly elastic warp portion K1 from a portion closer to the body portion 13 than the boundary R to the mouthpiece portion 15 . In addition, the fiber-reinforced base material 19 has second low-elasticity warp yarns 22c arranged in portions sandwiched between the high-elasticity warp portions K1 on both sides in the axial direction Y of the liner 12. , and a second low-elasticity warp portion K3 composed of the second low-elasticity warp yarns 22c.

Even in such a configuration, the high-elasticity warp portions K1 are arranged so as to include the easily deformable boundary R in the liner 12 to increase rigidity and suppress deformation in the vicinity of the boundary R. Therefore, in the vicinity of the boundary R, it is possible to suppress the occurrence of a large difference in the amount of deformation between the body portion 13 and the dome portion 14, thereby suppressing the occurrence of bending in the vicinity of the boundary R. As a result, it is possible to suppress the occurrence of a moment near the boundary R, suppress the occurrence of interlaminar shear stress in the fiber reinforced composite material layer 11 caused by the moment, and delaminate the fiber reinforced composite material layer 11. can be suppressed.

In addition, since the high-elasticity warp yarns 22a and the second low-elasticity warp yarns 22c are used as the warp yarns 22, it is not necessary to arrange the high-elasticity warp yarns 22a and the second low-elasticity warp yarns 22c separately on both sides of the liner 12 in the axial direction Y. Manufacture of the structure 21 becomes easy.

○ As shown in FIG. 10 or 11, the fiber reinforced base material 19 has highly elastic warp yarns 22a arranged over a portion near the body portion 13 and a portion near the dome portion 14 across the boundary R, A highly elastic warp portion K1 is provided at the portion where the highly elastic warp yarns 22a are arranged. The highly elastic warp yarns 22a are arranged along the axial direction Y from a portion of the dome portion 14 near the boundary R to a portion of the body portion 13 near the boundary R across the boundary R. That is, the highly elastic warp yarns 22a are arranged so as to include the boundary R. In addition, the fiber-reinforced base material 19 has the second low-elasticity warp yarns 22c arranged in a portion other than the high-elasticity warp portion K1, and the portion other than the high-elasticity warp portion K1 is composed of the second low-elasticity warp yarns 22c. It has a second low-elasticity warp portion K3.

Even in such a configuration, the high-elasticity warp portions K1 are arranged so as to include the easily deformable boundary R in the liner 12 to increase rigidity and suppress deformation in the vicinity of the boundary R. Therefore, in the vicinity of the boundary R, it is possible to suppress the occurrence of a large difference in the amount of deformation between the body portion 13 and the dome portion 14, thereby suppressing the occurrence of bending in the vicinity of the boundary R. As a result, it is possible to suppress the occurrence of a moment near the boundary R, suppress the occurrence of interlaminar shear stress in the fiber reinforced composite material layer 11 caused by the moment, and delaminate the fiber reinforced composite material layer 11. can be suppressed.

○ As a method for manufacturing the fiber structure 21, after weaving a fabric containing the high-elasticity warp yarns 22a and low-elasticity fiber bundles having a lower elastic modulus than the high-elasticity warp yarns 22a with a plain loom, the outer side of the fabric is reinforced by filament winding. The fiber reinforced substrate 19 may be woven by winding the fibers.

○ As a method for manufacturing the fiber structure 21, the high-elasticity warp 22a and the warp 22 containing the low-elasticity fiber bundle having a lower elastic modulus than the high-elasticity warp 22a are hoop-wound around the liner 12 to form the high-elasticity warp portion K1 and the low-elasticity warp. After forming the parts, the weft yarns 23 may be laminated on the outside thereof, or the warp yarns 22 and the weft yarns 23 may be wound to weave the fiber-reinforced base material 19 .

o The fiber reinforced substrate 19 may be a multi-layer fabric woven by multi-layer weaving. For example, the fiber-reinforced base material 19 includes a plurality of warp layers in which the warps 22 are arranged parallel to each other, a plurality of weft layers in which the wefts 23 are arranged in parallel, a warp layer, and a weft layer in the stacking direction. and a binding yarn for binding. When manufacturing the warp layers, the high-elasticity warp yarns 22a and the low-elasticity fiber bundles having a lower elastic modulus than the high-elasticity warp yarns 22a are used.

O In the embodiment, the fiber-reinforced base material 19 is configured by laminating the fabrics 24 woven by plain weaving, but it is not limited to this. For example, the fiber-reinforced base material 19 may have a structure in which fabrics woven by satin weave or twill weave are laminated.

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

O The liner 12 as a whole may be made of an aluminum alloy instead of being made of aluminum, or the mouthpiece 15 may be made of a metal other than stainless steel.
O The liner 12 may be formed by welding and integrating the body portion 13 and the dome portion 14 which are separate bodies.

(circle) the liner 12 and the mouthpiece part 15 may be integrally formed with a metal.
O The high-pressure tank 10 is not limited to being mounted and used as a hydrogen source for a fuel cell-equipped electric vehicle. It may also be used as a hydrogen source for a fuel cell for domestic power supply.

(circle) you may apply not only to the high-pressure tank which stores hydrogen as a pressure vessel but to the pressure vessel which stores other gases, such as nitrogen and compressed natural gas, for example.

L... Central axis line, R... Boundary, X... Circumferential direction, Y... Axial direction, Z... Radial direction, X1, X2... Yarn main axis direction, 10... High pressure tank as a pressure vessel, 11... Fiber reinforced composite material layer, 12 Liner 13 Body portion 14 Dome portion 15 Base portion 19 Fiber-reinforced base material 21 Fiber structure 22 Warp as first fiber bundle 22a Height as high-elasticity fiber bundle Elastic warps 22b... First low-elastic warp as a low-elastic fiber bundle 22c... Second low-elastic warp as a low-elastic fiber bundle 23... Weft as a second fiber bundle 24... Woven fabric.

Claims (6)

a cylindrical body;
a dome portion continuous with the body portion along the axial direction in which the central axis of the body portion extends and having a shape that tapers toward the central axis;
a mouthpiece provided at the tapered tip of the dome, and
A fiber structure having a fiber-reinforced base material covering the body portion and the dome portion of the liner from the outside,
constructing a pressure vessel in which the liner is reinforced by a fiber-reinforced composite material layer obtained by impregnating and curing the fiber-reinforced base material with a matrix resin;
The fiber-reinforced base material includes first fiber bundles arranged in the body portion and the dome portion so that the yarn main axis direction extends in the circumferential direction of the liner, and second fiber bundles forming a woven fabric together with the first fiber bundles. having a bundle and
When the boundary between the body portion and the dome portion along the axial direction is defined as a boundary,
The fiber-reinforced base material has, as the first fiber bundles, high-elasticity fiber bundles having a higher elastic modulus than the other first fiber bundles, and as the other first fiber bundles, the high-elasticity fiber bundles having higher elasticity than the high-elasticity fiber bundles. A fiber structure comprising a low-elasticity fiber bundle having a low modulus, wherein the high-elasticity fiber bundle is arranged in the body portion including the boundary. The low-elasticity fiber bundles include a first low-elasticity fiber bundle having a lower elastic modulus than the high-elasticity fiber bundle, and a higher elastic modulus than the first low-elasticity fiber bundle and a higher elasticity than the high-elasticity fiber bundle. having a second low modulus fiber bundle with a low modulus;
In the fiber-reinforced base material,
In the dome portion, the first low-elasticity fiber bundles are arranged as the low-elasticity fiber bundles adjacent to the high-elasticity fiber bundles along the axial direction,
In the body portion, the second low-elasticity fiber bundles are arranged as the low-elasticity fiber bundles adjacent to the high-elasticity fiber bundles along the axial direction,
2. The fiber structure according to claim 1, wherein in the dome portion, the second low-elasticity fiber bundles are arranged as the low-elasticity fiber bundles adjacent to the first low-elasticity fiber bundles along the axial direction. In the fiber-reinforced base material, the high-elasticity fiber bundles are arranged in the body portion and the dome portion sandwiching the boundary along the axial direction,
2. The fiber structure according to claim 1, wherein the low-elasticity fiber bundles are arranged in the remaining portions of the body portion and the dome portion. In the fiber-reinforced base material, the high-elasticity fiber bundles are arranged along the axial direction from the body portion to the mouthpiece, and the low-elasticity fiber bundles are arranged in the body portion. 2. The fiber structure according to 1. The fiber-reinforced base material has a structure in which a fabric woven by weaving the first fiber bundle and the second fiber bundle is wound around the liner. The fiber structure according to . a cylindrical body;
a dome portion continuous with the body portion along the axial direction in which the central axis of the body portion extends and having a shape that tapers toward the central axis;
a mouthpiece provided at the tapered tip of the dome, and
a fiber structure having a fiber-reinforced base material covering the body portion and the dome portion of the liner from the outside;
A pressure vessel in which the liner is reinforced by a fiber-reinforced composite material layer in which the fiber-reinforced base material is impregnated with a matrix resin and cured,
A pressure vessel, wherein the fiber structure is the fiber structure according to any one of claims 1 to 5.

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