JP7040347B2 - Pressure vessel and manufacturing method of pressure vessel - Google Patents

Description

The present invention relates to a pressure vessel and a method for manufacturing the pressure vessel.

The pressure vessel (so-called high-pressure tank) that houses gas such as compressed natural gas (CNG) and liquefied natural gas (LNG) is generally made of metal such as steel or aluminum alloy, and is heavy. In recent years, automobiles that use natural gas as fuel have been attracting attention as low-emission vehicles, and automobiles that use fuel cells as a power source have also been attracting attention as lower-emission vehicles. Some automobiles store hydrogen gas as fuel for fuel cells in a fuel tank, but the weight of the pressure vessel that serves as the fuel tank is heavy and fuel efficiency deteriorates. In order to eliminate this inconvenience, a pressure vessel in which the outside of a liner (inner shell) having a gas barrier property is covered with a pressure-resistant fiber-reinforced composite material layer has been proposed.

The liner of the pressure vessel is generally in the shape of having a cylindrical body portion and a dome portion continuous with at least one end of the body portion in the axial direction. The pressure vessel is filled with gas so as to have a pressure of several tens of MPa, and the liner is reinforced by the fiber-reinforced composite material layer. In such a pressure vessel, for example, as disclosed in Patent Document 1, one reinforcing fiber sheet is wound a plurality of times around the outer peripheral surfaces of the body portion and the dome portion from a direction orthogonal to the axis of the liner. Be done. The reinforcing fiber sheet wound around the pressure vessel disclosed in Patent Document 1 includes a first thread arranged on the body portion so that the yarn main axis direction extends in the circumferential direction of the liner, and the axial direction of the body portion and the dome portion. A second thread is provided on the body portion and the dome portion so that the yarn main axis direction extends in the axial direction of the thread. In the pressure vessel described in Patent Document 1, only the second thread is arranged in the dome portion in the state where the reinforcing fiber sheet is wound. Then, after winding the reinforcing fiber sheet around the pressure vessel, the continuous fiber impregnated with the resin is wound around the dome portion by hoop winding.

Japanese Unexamined Patent Publication No. 2017-187153

By the way, in order to realize the desired pressure resistance in Patent Document 1, continuous fibers extend in a predetermined direction at the dome portion, such as a direction orthogonal to the second thread of the reinforcing fiber sheet arranged at the dome portion. It is desirable to wind around the dome. However, since the dome portion has a curved shape, it is very difficult to perform winding while maintaining the extending direction of the continuous fibers in the entire dome portion, and there is room for improvement in terms of pressure resistance of the pressure vessel. was there.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a pressure vessel and a method for manufacturing a pressure vessel capable of improving pressure resistance.

The pressure vessel for solving the above problems has a liner provided with a cylindrical body portion and a dome portion continuous with at least one end in the axial direction of the body portion, and the liner has a liner along the circumferential direction of the liner. A pressure vessel provided with a fiber structure having a reinforcing fiber sheet that is wound around an outer peripheral surface and covers the liner from the outside. The reinforcing fiber sheet is the body of the body so that the yarn main axis direction extends in the circumferential direction of the liner. The first thread arranged in the portion and the dome portion is arranged in the body portion so that the yarn main axis direction extends in the axial direction of the body portion, and the thread main axis direction extends in the axial direction of the dome portion. The dome portion is provided with a second thread arranged in the dome portion, and is made of a woven fabric formed of the first thread and the second thread, and the second thread is the shaft of the liner. It includes a long thread extending to the entire body portion and the entire dome portion in the direction, and a short thread extending to the entire body portion and not extending to the dome portion in the axial direction of the liner. It is a feature.

A method for manufacturing a pressure vessel for solving the above problems is made of a textile having a liner provided with a cylindrical body portion and a dome portion continuous at at least one end in the axial direction of the body portion, and covering the liner from the outside. A first pressure vessel comprising a fiber structure having a reinforcing fiber sheet of the above, wherein the fiber structure is arranged in the body portion and the dome portion so that the yarn main axis direction extends in the circumferential direction of the liner. A method for manufacturing a pressure vessel having the first thread and the second thread forming the woven fabric, in which a plurality of the first threads are arranged in the axial direction of the liner. Of the openings formed between the first yarns adjacent to each other in the axial direction of the liner, the long yarn range covers the entire body portion and the entire dome portion in the axial direction of the liner. The liner is provided with the second yarn in the formed opening and the opening formed in the short yarn range that includes the entire body portion in the axial direction of the liner and does not include the dome portion in the range. The second thread inserted into the opening is pushed toward the liner by a reed motion to weave the first thread and the woven fabric of the second thread. The liner is rotated around the center axis of the liner as a rotation center, and the woven fabric is wound around the liner.

According to each of the above configurations, by winding the reinforcing fiber sheet around the outer peripheral surface of the liner, the thread spindle direction of the first thread becomes the circumferential direction of the liner, and therefore the thread spindle of the first thread to be arranged in the dome portion. The direction can be easily set to a direction suitable for the pressure resistance of the pressure vessel. Further, the short yarn of the second yarn is not arranged in the portion of the reinforcing fiber sheet that covers the dome portion. Therefore, when compared by the number of the second threads arranged, the dome portion is smaller than the body portion by the arrangement of the short yarns, so that the portion of the reinforcing fiber sheet covering the dome portion follows the shape of the dome portion. be able to. Therefore, the pressure resistance of the pressure vessel can be improved.

For the pressure vessel, the second thread further includes an intermediate thread extending in the entire body portion and a part of the dome portion in the axial direction of the liner, and the long thread and the intermediate thread in the circumferential direction of the liner. By arranging the yarns and the short yarns in this order, it is preferable that the yarns are arranged in the order in which the extension range in the axial direction of the liner becomes smaller in the circumferential direction of the liner.

According to the above configuration, as compared with the case where the second yarn is composed of the long yarn and the short yarn, the portion of the reinforcing fiber sheet covering the dome portion can be made to follow the shape of the dome portion more. Therefore, the pressure resistance of the pressure vessel can be further improved.

For the pressure vessel, the size of the arrangement pitch of the first threads adjacent to each other in the dome portion is preferably larger than the size of the arrangement pitch of the first threads adjacent to each other in the body portion.

According to the above configuration, in addition to the arrangement of the long thread and the short thread as the second thread, the size of the arrangement pitch of the adjacent first threads is made different between the body portion and the dome portion. The portion of the reinforcing fiber sheet that covers the dome portion can be made to follow the shape of the dome portion. Therefore, the pressure resistance of the pressure vessel can be further improved.

With respect to the pressure vessel, it is preferable that the size of the arrangement pitch of the first threads adjacent to each other in the dome portion is larger as the position away from the body portion in the axial direction of the dome portion .

According to the above configuration, the portion of the reinforcing fiber sheet that covers the dome portion is more dome portion than the case where the arrangement pitches of the first threads adjacent to each other in the entire dome portion in the axial direction of the liner are the same size. Can be made to follow the shape of. Therefore, the pressure resistance of the pressure vessel can be further improved.

According to the present invention, the pressure resistance can be improved.

Sectional drawing which shows typically the high pressure tank. The figure which shows the fiber structure schematically. (A) is a diagram schematically showing a fuselage seat portion, (b) is a diagram schematically showing a dome seat portion at one end in the axial direction of the liner, and (c) is a diagram schematically showing a dome seat portion at the other end in the axial direction of the liner. The figure which shows. The figure which shows typically the manufacturing method of the reinforcing fiber sheet. (A) A diagram schematically showing a state in which a weft is inserted, (b) a diagram schematically showing a state after a reed operation, and (c) a diagram schematically showing a state in which a reinforcing fiber sheet is wound around a liner. The figure shown in. (A) is a diagram schematically showing a fuselage seat portion in another embodiment, (b) is a diagram schematically showing a dome seat portion at one axial end of a liner in another embodiment, and (c) is another diagram. The figure which shows typically the dome sheet part of the other end in the axial direction of a liner in an embodiment. (A) A diagram schematically showing a state in which a weft is inserted in another embodiment, (b) a diagram schematically showing a state after a reed operation in another embodiment, and (c) a diagram schematically showing a state after a reed operation, and (c) is another embodiment. The figure which shows typically the state which the reinforcing fiber sheet was wound around the liner in the form.

Hereinafter, an embodiment in which the pressure vessel and the manufacturing method thereof are embodied will be described with reference to FIGS. 1 to 5.
As shown in FIG. 1, in a high-pressure tank 10 as a pressure vessel, a fiber structure 21 having an elongated hollow liner 12 and a reinforcing fiber sheet 19 covering the outside of the liner 12 is impregnated with a matrix resin Ma. It is configured. The high-pressure tank 10 reinforces the liner 12 with a fiber-reinforced composite material layer 11 made of a reinforcing fiber sheet 19 impregnated with the matrix resin Ma, and secures 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 extending direction of the central axis L of the liner 12 is defined as the axial direction Y of the liner. 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 axial direction of the body portion 13 coincides with the axial direction Y of the liner 12. The liner 12 has dome portions 14a and 14b having a curved shape at both ends in the axial direction of the body portion 13. In the dome portions 14a and 14b, the diameter of the end portion on the body portion 13 side is the same as the diameter of the body portion 13, and the diameter becomes smaller as the distance from the body portion 13 increases. The axial direction of the dome portions 14a and 14b coincides with the axial direction Y of the liner 12. The liner 12 includes a base portion 15 projecting outward from the dome portions 14a and 14b along the axial direction Y of the liner 12. Each base portion 15 is made of metal (for example, made of stainless steel). Each base portion 15 includes a hole portion 16 that communicates with the space in the liner 12. Of the dome portions 14a and 14b, a screw 18 is screwed into the hole portion 16 of the base portion 15 in the dome portion 14a on the one end side in the axial direction Y of the liner 12. Of the dome portions 14a and 14b, the valve 17 is mounted in the hole portion 16 of the base portion 15 in the dome portion 14b on the other end side of the liner 12 in the axial direction Y.

As shown in FIG. 2, the reinforcing fiber sheet 19 is a long woven fabric 50 woven by plain weaving a plurality of warp threads 30 and a plurality of weft threads 40. The reinforcing fiber sheet 19 is wound around the outer peripheral surface of the liner 12 so that the longitudinal direction of the reinforcing fiber sheet 19 extends in the circumferential direction Z of the liner 12. In the reinforcing fiber sheet 19, the warp threads 30 and the weft threads 40 are arranged orthogonal to each other. The plurality of warp threads 30 are arranged on the body portion 13 and the dome portions 14a and 14b in a state parallel to each other in the axial direction Y of the liner 12. The yarn spindle direction X1 of each warp 30 extends linearly in the circumferential direction Z of the liner 12 at the body portion 13 and the dome portions 14a and 14b. Further, the radial direction of the liner 12 is orthogonal to the thread main axis direction X1 of the warp thread 30.

The plurality of wefts 40 are arranged in the body portion 13 and the dome portions 14a and 14b in a state parallel to each other in the circumferential direction Z of the liner 12. Of the wefts 40, the yarn main axis direction X2 of the wefts 40 arranged in the body portion 13 extends in the axial direction of the body portion 13 in the liner 12. Of the wefts 40, the yarn main axis direction X2 of the wefts 40 arranged in the dome portions 14a and 14b extends in the axial direction Y of the liner 12, while is curved along the curved surface of the dome portions 14a and 14b.

The liner 12 is reinforced in the radial direction of the liner 12 by arranging the warp 30 and the weft 40 orthogonally and aligning the extending direction of the yarn main axis direction X1 of the warp 30 with the circumferential direction Z of the liner 12. Further, the liner 12 is reinforced in the axial direction Y of the liner 12 by matching the thread main axial direction X2 of the weft 40 with the axial direction Y of the liner 12.

The reinforcing fiber sheet 19 has a plurality of first reinforcing fibers 31 and a plurality of first auxiliary threads 32 as warp threads 30. The first reinforcing fiber 31 and the first auxiliary thread 32 are arranged so as to be adjacent to each other in the axial direction Y of the liner 12 by being arranged alternately. Further, the first reinforcing fibers 31 to each other, the first auxiliary threads 32 to each other, and the first reinforcing fibers 31 and the first auxiliary thread 32 are arranged in parallel with each other. Further, the reinforcing fiber sheet 19 has a plurality of second reinforcing fibers 41 and a plurality of second auxiliary threads 42 as the wefts 40. The second reinforcing fiber 41 and the second auxiliary thread 42 are arranged so as to be adjacent to each other in the circumferential direction Z of the liner 12 by being arranged alternately. The second reinforcing fibers 41 to each other, the second auxiliary threads 42 to each other, and the second reinforcing fibers 41 and the second auxiliary thread 42 are arranged in parallel with each other. The first reinforcing fiber 31 and the first auxiliary thread 32 correspond to the first thread, and the second reinforcing fiber 41 and the second auxiliary thread 42 correspond to the second thread.

In the present embodiment, carbon fibers are provided as the first reinforcing fiber 31, the second reinforcing fiber 41, the first auxiliary thread 32, and the second auxiliary thread 42. The first reinforcing fiber 31, the second reinforcing fiber 41, the first auxiliary thread 32, and the second auxiliary thread 42 are not limited to carbon fibers, but are glass fibers, silicon carbide-based ceramic fibers, aramid fibers, and ultra-high molecular weight polyethylene fibers. Other fibers generally said to have high elasticity and high strength may be used. Further, in the present embodiment, the same thread is used for the first reinforcing fiber 31 and the second reinforcing fiber 41. The first auxiliary thread 32 and the second auxiliary thread 42 are composed of fiber bundles thinner than the first reinforcing fiber 31 and the second reinforcing fiber 41.

As shown in FIG. 3A, the body portion 13 of the liner 12 is covered with the body portion 19m which is a part of the reinforcing fiber sheet 19. As shown in FIG. 3B, the dome portion 14a of the liner 12 is covered with the dome sheet portion 19a which is a part of the reinforcing fiber sheet 19. As shown in FIG. 3C, the dome portion 14b of the liner 12 is covered with the dome sheet portion 19b which is a part of the reinforcing fiber sheet 19. In addition, in FIG. 3 (a), FIG. 3 (b), and FIG. 2 There is a gap between the auxiliary thread 42 and the gap, but such a gap does not actually exist. In the actual reinforcing fiber sheet 19, the adjacent first reinforcing fiber 31 and the first auxiliary thread 32 are arranged so as to be in contact with each other in the axial direction Y of the liner 12, and the adjacent second reinforcing fiber 41 and the first reinforcing fiber sheet 19 are arranged so as to be in contact with each other. 2 The auxiliary threads 42 are arranged so as to come into contact with each other in the circumferential direction Z of the liner 12.

As shown in FIGS. 3A, 3B, and 3C, in the reinforcing fiber sheet 19, the second reinforcing fiber 41 and the second auxiliary thread 42 are arranged in the axial direction Y of the liner 12 (FIG. 3). The extension range in 3 (a), FIG. 3 (b), and FIG. 3 (c) in the vertical direction) is the circumferential direction Z of the liner 12 (FIG. 3 (a), 3 (b), and 3 (c). In), they are arranged in ascending order in the left-right direction). Here, regarding the second reinforcing fiber 41 and the second auxiliary thread 42, the second reinforcing fiber 41a, the second auxiliary thread 42a, and the second reinforcing fiber 41b, in order from the thread having the largest extension range in the axial direction Y of the liner 12. And the second auxiliary thread 42b.

The second reinforcing fiber 41a extends to the entire body portion 13 and the entire dome portions 14a and 14b in the axial direction Y of the liner 12. The second auxiliary thread 42a includes the entire body portion 13 and a part of the dome portions 14a and 14b which are smaller than the second reinforcing fiber 41a among the dome portions 14a and 14b in the axial direction Y of the liner 12. It is extended in. The second reinforcing fiber 41b extends in the axial direction Y of the liner 12 in the entire body portion 13 and in a range of the dome portions 14a and 14b smaller than the second auxiliary thread 42a. The second auxiliary thread 42b extends over the entire body portion 13 in the axial direction Y of the liner 12, and does not extend over the dome portions 14a and 14b. The arrangement of the second reinforcing fiber 41a, the second auxiliary thread 42a, the second reinforcing fiber 41b, and the second auxiliary thread 42b is repeated in the circumferential direction Z of the liner 12.

By setting the extension range of the second reinforcing fiber 41 and the second auxiliary thread 42 as described above, the second reinforcing fiber 41 and the second auxiliary thread existing per unit length in the axial direction Y of the liner 12 are set. Comparing with the total number N of 42, the total number N of the dome seat portions 19a and 19b is smaller than the total number N of the body seat portions 19m. As a result, the thickness of the dome seat portions 19a and 19b is smaller than the thickness of the body seat portion 19m.

Further, the total number N of the second reinforcing fibers 41 and the second auxiliary thread 42 existing per unit length of the liner 12 in the axial direction Y in the dome portions 14a and 14b decreases as the distance from the body portion 13 increases. There is. As a result, the thickness of the dome seat portions 19a and 19b becomes smaller as the dome seat portions 19a and 19b are located farther from the body seat portion 19m. In this modified example, the second reinforcing fiber 41a corresponds to the long yarn, and the second auxiliary yarn 42b corresponds to the short yarn. Further, the second auxiliary thread 42a and the second reinforcing fiber 41b correspond to the intermediate thread.

Next, a method for manufacturing the high-pressure tank 10 will be described.
When manufacturing the high-pressure tank 10, the warp and weft 40 are plain-woven, and the woven fabric 50 that has been manufactured is wound around the liner 12.

As shown in FIG. 4, the woven fabric 50 is woven by a plain weave loom. In the plain weave loom, for example, among the first reinforcing fiber 31 and the first auxiliary yarn 32 as the warp 30, the reinforcing fiber heddle frame 33 for opening the first reinforcing fiber 31 and the auxiliary for opening the first auxiliary yarn 32. A thread heddle frame 34 is provided. Further, the plain weave loom has a structure in which a warp beam 35 for supplying the first reinforcing fiber 31 and a warp beam 36 for supplying the first auxiliary thread 32 are arranged. The first reinforcing fiber 31 sent out from the warp beam 35 is opened by the reinforcing fiber heddle frame 33. The first auxiliary thread 32 sent out from the warp beam 36 is opened by the auxiliary thread heddle frame 34. The stitches of the reinforcing fiber heddle frame 33 and the auxiliary thread heddle frame 34 are indicated by black circles in the figure.

The reed 39 is arranged between the reinforcing fiber heddle frame 33 and the auxiliary thread heddle frame 34 and the weaving front 45. The reed 39 is a member that extends linearly in the axial direction Y of the liner 12 (perpendicular to the paper surface in FIG. 4). Further, the second reinforcing fiber 41 and the second auxiliary thread 42 as the weft 40 are wefted (inserted) into the openings of the first reinforcing fiber 31 and the first auxiliary thread 32 by a wefting mechanism (not shown). It has become so. In the feeding direction of the first reinforcing fiber 31 and the first auxiliary yarn 32, the liner 12 is rotatably supported before the pre-weaving 45. The liner 12 rotates about the central axis L as the center of rotation.

When weaving the reinforcing fiber sheet 19 with the above plain weave machine, the ends of the plurality of first reinforcing fibers 31 drawn from the warp beam 35 and the plurality of first auxiliary threads 32 drawn from the warp beam 36 are used. And the end of the liner 12 are fixed to the outer peripheral surface of the liner 12 with, for example, an adhesive. As a result, the first reinforcing fiber 31 and the first auxiliary thread 32 are stretched in a state of being arranged in the body portion 13 and the dome portions 14a and 14b along the axial direction Y of the liner 12. The first reinforcing fiber 31 and the first auxiliary thread 32 extend so that the first reinforcing fiber 31 and the first auxiliary thread 32 are alternately arranged in the axial direction Y of the liner 12. The adhesive to be used is preferably a material that melts by heating when the matrix resin Ma is impregnated and cured in the reinforcing fiber sheet 19, but an adhesive made of a material that does not melt may be used.

When weaving the reinforcing fiber sheet 19, the reinforcing fiber heddle frame 33 and the auxiliary thread heddle frame 33 and the auxiliary thread are alternately moved in the vertical direction without rotating the liner 12. The heddle frame 34 is moved in the opposite direction. As a result, the warp opening 30a is formed by the first reinforcing fiber 31 and the first auxiliary thread 32. The warp opening 30a is formed each time the first reinforcing fiber 31 and the first auxiliary thread 32 are alternately opened up and down by adjacent ones. Each time the warp opening 30a is formed, the second reinforcing fiber 41 and the second auxiliary thread 42 are alternately wefted (inserted) into the warp opening 30a.

As shown in FIG. 5A, when weaving the second reinforcing fiber 41 or wefting the second auxiliary thread 42 into the warp opening 30a, the range in which such wefting is performed is the axial direction of the liner 12. Make it different with Y. The wefting of the second reinforcing fiber 41a is performed in the entire range of the body portion 13 and the dome portions 14a and 14b in the axial direction Y of the liner 12. The range in which the second reinforcing fiber 41a is wefted corresponds to the long yarn range. The wefting of the second auxiliary thread 42a is performed in the axial direction Y of the liner 12 in the entire body portion 13 and in the range of the dome portions 14a and 14b smaller than the second reinforcing fiber 41a. The wefting of the second reinforcing fiber 41b is performed in the axial direction Y of the liner 12 in the entire body portion 13 and in the range of the dome portions 14a and 14b smaller than the second auxiliary thread 42a. The wefting of the second auxiliary thread 42b is performed on the entire body portion 13 in the axial direction Y of the liner 12, but not on the dome portions 14a and 14b. The range in which the second auxiliary yarn 42a is wefted corresponds to the short yarn range. In the circumferential direction Z of the liner 12, wefting is repeatedly performed in the order of the second reinforcing fiber 41a, the second auxiliary thread 42a, the second reinforcing fiber 41b, and the second auxiliary thread 42b.

The second reinforcing fiber 41 arranged as the second reinforcing fiber 41a and the second reinforcing fiber 41b, and the second auxiliary thread 42 arranged as the second auxiliary thread 42a and the second auxiliary thread 42b are the shafts of the liner 12. The length is set so that wefting can be performed in the warp opening 30a by all the first reinforcing fibers 31 and the first auxiliary thread 32 arranged in the direction Y. Therefore, in the second auxiliary thread 42a, the second reinforcing fiber 41b, and the second auxiliary thread 42b, both end portions of the liner 12 in the axial direction Y do not participate in wefting into the warp opening 30a. Further, the portion not involved in such wefting is longer in the order of the second auxiliary thread 42a, the second reinforcing fiber 41b, and the second auxiliary thread 42b in the axial direction Y of the liner 12. Then, the portions that are not involved in such wefting extend along the surface of the reinforcing fiber sheet 19 as fibers.

As shown in FIG. 5B, after the formation of the warp opening 30a and the alternate wefting of the second reinforcing fiber 41 and the second auxiliary thread 42 into the warp opening 30a are performed a predetermined number of times, the reed 39 is reed. The operation is performed. Depending on the reed striking operation by the reed 39, the second reinforcing fiber 41 and the second auxiliary thread 42 are fed toward the ends of the first reinforcing fiber 31 and the first auxiliary thread 32 fixed to the outer peripheral surface of the liner 12. After that, the reinforcing fiber heddle frame 33 and the auxiliary thread heddle frame 34 are moved in the opposite directions to change the opening state, and the next wefting operation is performed. By repeating these operations, the reinforcing fiber sheet 19 in which the first reinforcing fiber 31 and the first auxiliary thread 32 and the second reinforcing fiber 41 and the second auxiliary thread 42 are plain-woven is woven. Further, together with the weaving of the reinforcing fiber sheet 19, a state in which the reinforcing fiber sheet 19 is integrated with the liner 12 is formed.

As shown in FIG. 5 (c), the woven fabric 50 winds the woven fabric 50 around the liner 12 by rotating the liner 12 around the center axis L, and continues as described above. Similarly, the woven fabric 50 is woven. As a result, the woven fabric 50, that is, the reinforcing fiber sheet 19 is wound around the liner 12 in a state of covering the entire dome portions 14a and 14b and the body portion 13. As a result, the fiber structure 21 having the reinforcing fiber sheet 19 on the outer peripheral surface of the liner 12 is manufactured. When the weaving of the woven fabric 50 has progressed to a certain extent, or when the weaving of the woven fabric 50 is completed, the woven fabric 50 is cut by cutting the portions of the second reinforcing fiber 41 and the second auxiliary thread 42 which are not involved in the above weaving. Remove from.

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

Next, the operation of the high pressure tank 10 will be described.
When the number of the second reinforcing fibers 41 and the second auxiliary threads 42 to be arranged is relatively small as in the dome sheet portions 19a and 19b, the liner 12 is wound when the reinforcing fiber sheet 19 is wound around the outer peripheral surface of the liner 12. The second reinforcing fiber 41 and the second auxiliary thread 42 are easy to move according to the shape of the dome. Therefore, the dome sheet portions 19a and 19b tend to follow the shapes of the dome portions 14a and 14b.

Further, since the diameter of the dome portions 14a and 14b is smaller than the diameter of the body portion 13 as the diameter of the dome portions 14a and 14b is farther from the body portion 13 in the axial direction of the dome portions 14a and 14b, the body portion is smaller in the axial direction of the dome portions 14a and 14b. The farther the position is from 13, the larger the curved shape is from the body portion 13. In the dome sheet portions 19a and 19b, the total number N is smaller as the position is farther from the body portion 13 in the axial direction Y of the liner 12. Therefore, the larger the degree of curvature in the dome portions 14a and 14b, the easier it is for the second reinforcing fibers 41 and the second auxiliary thread 42 to be arranged to move. Therefore, the dome sheet portions 19a and 19b that cover the portions of the dome portions 14a and 14b having a large degree of curvature are more likely to follow the shape of the dome portions 14a and 14b.

Since the portion of the dome portions 14a and 14b to which the base portion 15 is connected has a shape protruding outward along the axial direction Y of the liner 12, it receives the above internal pressure and is outside the dome portions 14a and 14b. Deformation is likely to occur due to bending toward the dome. In the present embodiment, since the thicknesses W2 and W3 of the dome sheet portions 19a and 19b are smaller than the thickness W1 of the body seat portion 19m, the dome sheet portions 19a and 19b are less likely to be deformed.

Further, in the high pressure tank 10, the internal pressure generated in the dome portions 14a and 14b is smaller than the internal pressure generated in the body portion 13. Therefore, even if the thickness of the dome sheet portions 19a and 19b is not as large as the thickness of the body seat portion 19m, it is possible to realize the reinforcing fiber sheet 19 having appropriate pressure resistance. In the present embodiment, the thicknesses W2 and W3 of the dome sheet portions 19a and 19b are made smaller than the thickness W1 of the body seat portion 19m so that the reinforcing fiber sheet 19 has appropriate pressure resistance and the dome sheet portions 19a and 19b. It is possible to suppress the surplus of the thicknesses W2 and W3.

In the above embodiment, the following effects can be obtained.
(1-1) By winding the reinforcing fiber sheet 19 around the outer peripheral surface of the liner 12, the thread main axis direction X1 of the first reinforcing fiber 31 and the first auxiliary thread 32 becomes the circumferential direction Z of the liner 12, so that the dome portion 14a , 14b, the yarn spindle direction X1 of the first reinforcing fiber 31 and the first auxiliary yarn 32 can be easily set in a direction suitable for the pressure resistance of the high pressure tank 10. Further, the second auxiliary thread 42b is not arranged on the dome sheet portions 19a and 19b. Therefore, when the total number N of the second reinforcing fibers 41 and the second auxiliary yarn 42 to be arranged is compared, the dome portions 14a and 14b are smaller than the body portion 13 by the arrangement of the second auxiliary yarn 42b, so that the dome portion is dome. The seat portions 19a and 19b can be made to follow the shape of the dome portions 14a and 14b. Therefore, the pressure resistance of the high pressure tank 10 can be improved.

(1-2) The weft 40 includes a second auxiliary thread 42a and a second reinforcing fiber 41b extending to the entire body portion 13 and a part of the dome portions 14a and 14b in the axial direction Y of the liner 12. Therefore, as compared with the case where the weft 40 is composed of the second reinforcing fiber 41a and the second auxiliary thread 42b, the dome sheet portions 19a and 19b can be more closely aligned with the shape of the dome portions 14a and 14b. Therefore, the pressure resistance of the high pressure tank 10 can be further improved.

The above embodiment can be modified and implemented as follows. The above embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.

○ As in the above embodiment, the extension ranges of the second reinforcing fiber 41 and the second auxiliary thread 42 are made different in the circumferential direction Z of the liner 12, and the body portion 13 and the dome portions 14a and 14b are the first. 1 The size of the arrangement pitch of the reinforcing fiber 31 and the first auxiliary thread 32 may be different. In this modification, for example, as shown in FIG. 6A, in the body sheet portion 119m, which is a portion of the reinforcing fiber sheet 119 that covers the body portion 13, the first reinforcing fiber 31 and the first auxiliary thread are adjacent to each other. The arrangement pitch with 32 is the magnitude P1. The size of the arrangement pitch is the distance between the central axes of adjacent threads. As shown in FIG. 6B, in the dome sheet portion 119a, which is a portion of the reinforcing fiber sheet 119 that covers the dome portion 14a, the size of the arrangement pitch of the adjacent first reinforcing fiber 31 and the first auxiliary thread 32 is large. P2 is larger than the above-mentioned size P1. As shown in FIG. 6C, in the dome sheet portion 119b, which is a portion of the reinforcing fiber sheet 119 that covers the dome portion 14b, the size of the arrangement pitch of the adjacent first reinforcing fiber 31 and the first auxiliary thread 32 is large. P3 is larger than the above-mentioned size P1.

By setting the sizes P1, P2, and P3 of the arrangement pitch as described above, the total number of the first reinforcing fibers 31 and the first auxiliary yarn 32 existing per unit length in the axial direction Y of the liner 12. Compared with N, the dome seat portions 119a and 119b are smaller than the fuselage seat portion 119m. Further, in the dome sheet portions 119a and 119b, the sizes P2 and P3 of the arrangement pitch are smaller as the positions closer to the body portion 13 in the axial direction of the dome portions 14a and 14b.

Here, of the dome portion 14a, the end side portion of the liner 12 in the axial direction Y (the right portion of the dome portion 14a in FIG. 2) and the dome portion 14b, the end portion side of the liner 12 in the axial direction Y. (In FIG. 2, the left side portion of the dome portion 14b) and the portion of the first dome portion. Of the dome portion 14a, the portion of the liner 12 on the body portion 13 side in the axial direction Y (the left portion of the dome portion 14a in FIG. 2) and the dome portion 14b of the liner 12 on the body portion 13 side in the axial direction Y. A portion (the portion on the right side of the dome portion 14b in FIG. 2) and a portion (the portion on the right side of the dome portion 14b in FIG. 2) are referred to as a second dome portion. Further, the portion of the dome sheet portion 119a that covers the first dome portion (the upper portion in FIG. 6B) is referred to as the first sheet portion 119c, and the portion of the dome sheet portion 119b that covers the first dome portion. (The lower portion in FIG. 6C) is referred to as the first sheet portion 119e. The portion of the dome sheet portion 119a that covers the second dome portion (lower portion in FIG. 6B) is referred to as the second sheet portion 119d, and the portion of the dome sheet portion 119b that covers the second dome portion (the portion that covers the second dome portion). In FIG. 6C, the upper portion) is referred to as the second seat portion 119f. In the dome sheet portion 119a, the size P2 of the arrangement pitch in the second sheet portion 119d is smaller than the size P2 of the arrangement pitch in the first sheet portion 119c. In the dome sheet portion 119b, the size P3 of the arrangement pitch in the second sheet portion 119f is smaller than the size P3 of the arrangement pitch in the first sheet portion 119e.

The first reinforcing fiber 31 and the first auxiliary thread 32 arranged in the body seat portion 119 m have a relatively large thickness and a narrow shape. On the other hand, the first reinforcing fiber 31 and the first auxiliary thread 32 arranged in the dome sheet portion 119a and the first reinforcing fiber 31 and the first auxiliary thread 32 arranged in the dome sheet portion 119b are flat and have a body sheet. The thickness is smaller than that of the portion 119 m, and the shape is wide. As a result, in the reinforcing fiber sheet 119, the thickness of the dome sheet portion 119a and the thickness of the dome sheet portion 119b are smaller than the thickness of the body sheet portion 119m. Further, in the dome sheet portions 119a and 119b, the first reinforcing fibers 31 and the first auxiliary thread 32 that are arranged at positions farther from the body portion 13 in the axial direction of the dome portions 14a and 14b have a smaller thickness and a wider shape. It has become. As a result, the thickness of the dome sheet portions 119a and 119b becomes smaller as the distance from the body portion 13 in the axial direction of the dome portions 14a and 14b increases.

Further, also in this modified example, the plain weave loom shown in FIG. 4 is used to weave the woven fabric 50 in the same manner as in the above embodiment. In this modified example, as shown in FIG. 7A, the arrangement pitch in the arrangement portion on the dome portions 14a and 14b is larger than the size of the arrangement pitch in the arrangement portion on the body portion 13. The first reinforcing fiber 31 and the first auxiliary thread 32 are arranged so as to increase in size. Further, the first reinforcing fiber 31 and the first auxiliary thread are arranged so that the arrangement pitch in the arrangement portion on the dome portions 14a and 14b becomes larger as the position away from the body portion 13 in the axial direction of the dome portions 14a and 14b increases. 32 are arranged. Then, the warp opening 30a is formed by the first reinforcing fiber 31 and the first auxiliary thread 32, and the second reinforcing fiber 41 and the second auxiliary thread 42 are alternately wefted (inserted) into the warp opening 30a. This wefting is performed in the same manner as in the above embodiment.

As shown in FIG. 7B, after the formation of the warp opening 30a and the alternate wefting of the second reinforcing fiber 41 and the second auxiliary thread 42 into the warp opening 30a are performed a predetermined number of times, the reed 39 is reed. The operation is performed. The reinforcing fiber sheet 119 is woven by repeating the reed-beating operation and the wefting operation. Then, as shown in FIG. 7 (c), by rotating the liner 12 around the center axis L, the woven fabric 50, that is, the reinforcing fiber sheet 119 is covered with the entire dome portions 14a and 14b and the body portion 13. Is wrapped around the liner 12.

In this modified example, the same operation as that of the above embodiment can be obtained. Further, in this modified example, the following effects can be obtained in addition to the effects of (1-1) and (1-2) of the above-described embodiment.

(2-1) In addition to arranging the second reinforcing fiber 41a, the second auxiliary thread 42a, the second reinforcing fiber 41b, and the second auxiliary thread 42b having different extending ranges in the axial direction Y of the liner 12, they are adjacent to each other. The size of the arrangement pitch of the matching first reinforcing fiber 31 and the first auxiliary thread 32 is different between the body portion 13 and the dome portions 14a and 14b. As a result, the number of the first reinforcing fibers 31 and the first auxiliary thread 32 arranged in the dome sheet portions 119a and 119b is reduced, so that the dome sheet portions 119a and 119b are made to follow the shape of the dome portions 14a and 14b. Can be done. Therefore, the pressure resistance of the high pressure tank 10 can be further improved.

(2-2) A dome sheet as compared with a case where the arrangement pitches of the first reinforcing fibers 31 and the first auxiliary thread 32, which are adjacent to each other in the entire dome portions 14a and 14b in the axial direction Y of the liner 12, are the same size. The portions 119a and 119b can be made to follow the shape of the dome portions 14a and 14b. Therefore, the pressure resistance of the high pressure tank 10 can be further improved.

○ In the above modification example, the size of the arrangement pitch of the first reinforcing fiber 31 and the first auxiliary thread 32 adjacent to each other in the dome portions 14a and 14b may be changed stepwise in the axial direction Y of the liner 12. In this modification, for example, in the dome portions 14a and 14b, a plurality of first reinforcing fibers 31 and the first auxiliary thread 32 are arranged at the same arrangement pitch, and the arrangement pitch is set in the axial direction Y of the liner 12. The closer to the body portion 13, the smaller the size.

○ In the above modification example, the arrangement pitch of the first reinforcing fiber 31 and the first auxiliary thread 32 adjacent to each other in the dome portions 14a and 14b does not have to be sequentially changed in size in the axial direction Y of the liner 12. For example, in the arrangement pitch of the first reinforcing fiber 31 and the first auxiliary thread 32 adjacent to each other in the dome portions 14a and 14b, a relatively large arrangement pitch and a relatively small arrangement pitch are alternately arranged in the axial direction Y of the liner 12. You may do so.

○ In the above modification example, the combination of the size of the arrangement pitch of the first reinforcing fiber 31 and the first auxiliary thread 32 in the axial direction Y of the liner 12 may be different between the dome portion 14a and the dome portion 14b.

○ In the above modified example, the size of the arrangement pitch of the first reinforcing fiber 31 and the first auxiliary thread 32 adjacent to each other in the dome portions 14a and 14b may be the same as the entire dome portions 14a and 14b. .. In the dome portion 14a and the dome portion 14b, the size of the arrangement pitch of the adjacent first reinforcing fiber 31 and the first auxiliary thread 32 may be the same size or different sizes.

○ In the above embodiment, the thread extending over the entire body portion 13 and the entire dome portions 14a and 14b in the axial direction Y of the liner 12 may be changed to the second auxiliary thread 42. In this case, for example, the extension range of the liner 12 in the axial direction Y is reduced in the order of the second auxiliary thread 42, the second reinforcing fiber 41, the second auxiliary thread 42, and the second reinforcing fiber 41. 2 The reinforcing fibers 41 and the second auxiliary thread 42 are arranged in the circumferential direction Z of the liner 12.

○ In the above embodiment, the arrangement order of the second reinforcing fiber 41 and the second auxiliary thread 42 does not have to be in the order in which the extension range of the liner 12 in the axial direction Y becomes smaller in the circumferential direction Z of the liner 12. For example, among the second reinforcing fiber 41 and the second auxiliary yarn 42, a yarn having a relatively large extension range in the axial direction Y of the liner 12 and a yarn having a relatively small extension range in the axial direction Y of the liner 12. However, they may be arranged alternately in the circumferential direction Z of the liner 12.

○ Of the second reinforcing fiber 41 and the second auxiliary thread 42, two or more threads having the same extension range in the axial direction Y of the liner 12 are lined up in succession in the circumferential direction Z of the liner 12. 2 The reinforcing fiber 41 and the second auxiliary thread 42 may be arranged.

○ The second reinforcing fiber 41 and the second auxiliary thread 42 may be extended so that the extension range is 5 or more in the axial direction Y of the liner 12, and the extension range is 3 or less. It may be extended as such. The second reinforcing fiber 41 and the second auxiliary thread 42 are a long thread extending in the entire body portion 13 and the entire dome portions 14a and 14b in the axial direction Y of the liner 12, and the entire body portion 13. It is provided with at least a short thread extending to the dome portion 14a and 14b and not extending in the entire dome portion 14a and 14b.

○ The reinforcing fiber sheets 19 and 119 are laminated with a fiber layer formed of the first reinforcing fiber 31 and the first auxiliary thread 32 and a fiber layer formed of the second reinforcing fiber 41 and the second auxiliary thread 42. , It may be made of a multi-layer woven fabric in which a plurality of fiber layers are restrained in the stacking direction with a restraining thread.

◯ The woven fabric 50 may be woven by adopting a fiber base material impregnated with a resin in advance.
The liner 12 may have a shape in which a dome portion is continuous at one end of the body portion 13 in the axial direction Y and a flat bottom wall is continuous at the other end of the body portion 13 in the axial direction Y. In this case, the base portion 15 exists only on one end side in the axial direction Y where the dome portion exists.

○ Instead of making the entire liner 12 made of aluminum, it may be made of an aluminum alloy, or the material of the base portion 15 may be made of a metal different from stainless steel.
○ The high-pressure tank 10 is not limited to the one mounted and used as a hydrogen source for an electric vehicle equipped with a fuel cell, and may be applied to, for example, a hydrogen source for a hydrogen engine, a heat pump, or the like. It may also be used as a hydrogen source for a fuel cell of a household power source.

○ The pressure vessel is not limited to a high-pressure tank that stores hydrogen, but may be applied to a pressure vessel that stores other gases such as nitrogen and compressed natural gas.

L ... Central axis, 12 ... Liner, 13 ... Body part, 14a, 14b ... Dome part, 19,119 ... Reinforcing fiber sheet, 21 ... Fiber structure, 30 ... Warp, 31 ... First reinforcing fiber, 32 ... First Auxiliary yarn, 40 ... weft, 41 ... second reinforcing fiber, 42 ... second auxiliary yarn, 50 ... woven fabric.

Claims (5)

It has a liner comprising a cylindrical body portion and a dome portion continuous at at least one end of the body portion in the axial direction.
A pressure vessel provided with a fiber structure having a reinforcing fiber sheet that is wound around the outer peripheral surface of the liner along the circumferential direction of the liner and has a reinforcing fiber sheet that covers the liner from the outside.
The reinforcing fiber sheet has a first thread arranged in the body portion and the dome portion so that the yarn spindle direction extends in the circumferential direction of the liner, and the yarn spindle direction extends in the axial direction of the body portion. A second thread arranged in the body portion and arranged in the dome portion so that the yarn spindle direction extends in the axial direction of the dome portion is provided, and the first thread and the second thread are provided. It is made of textiles made of
The second thread extends to the entire body and the dome in the axial direction of the liner, and extends to the entire body in the axial direction of the liner and extends to the dome. A pressure vessel characterized by containing non-extending short yarns. The second thread further includes an intermediate thread extending in the entire body portion and a part of the dome portion in the axial direction of the liner, and the long thread, the intermediate thread, and the intermediate thread in the circumferential direction of the liner. The pressure vessel according to claim 1, wherein the pressure vessels are arranged in the order of the short yarns so that the extension range in the axial direction of the liner becomes smaller in the circumferential direction of the liner. The first or second aspect of the present invention, wherein the size of the arrangement pitch of the first threads adjacent to each other in the dome portion is larger than the size of the arrangement pitch of the first threads adjacent to each other in the body portion. Pressure vessel. The pressure vessel according to claim 3 , wherein the size of the arrangement pitch of the first threads adjacent to each other in the dome portion is larger toward a position distant from the body portion in the axial direction of the dome portion . It has a liner comprising a cylindrical body portion and a dome portion continuous at at least one end of the body portion in the axial direction.
A pressure vessel with a fiber structure having a woven reinforced fiber sheet covering the liner from the outside.
The fiber structure has a first thread 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 a second thread forming the first thread and the woven fabric. A method of manufacturing a pressure vessel having a thread and
A plurality of the first threads are stretched in a state of being arranged in the axial direction of the liner.
Among the openings formed between the first yarns adjacent to each other in the axial direction of the liner, the long yarns formed in the long yarn range covering the entire body portion and the entire dome portion in the axial direction of the liner. The second thread is placed in the axial direction of the liner in the opening and the opening formed in the short thread range that includes the entire body portion in the axial direction of the liner and does not include the dome portion in the range. Insert along and
The second thread inserted into the opening is pushed toward the liner by a reed operation to weave the woven fabric of the first thread and the second thread, and the liner is inserted into the center axis of the liner. A method for manufacturing a pressure vessel, which comprises rotating the woven fabric as a center of rotation and winding the woven fabric around the liner.

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