High-pressure storage tank inner container, method for manufacturing the same, and high-pressure storage tank

Abstract

The present application provides a kind of high-pressure storage tank inner container and its manufacturing method and high-pressure storage tank.The high-pressure storage tank inner container (2) of the present application has main body (5), expanding diameter portion (9) and step portion (12), main body is made of cylinder body;Expanding diameter portion is formed in main body, and is made of the cylinder body of the outer diameter of the diameter of main body general portion (8) expansion;Step portion (11) is formed between the general portion (8) of main body and expanding diameter portion (9), is made of multiple steps, the distance (D) from the corner (15) of the expanding diameter portion (9) side of step portion (11) to the periphery (8a) of general portion (8) through the corner (15) of each step (13) constituting step portion (12) is shorter than the transverse width (W) of reinforcing fiber roving (7), and reinforcing fiber roving is arranged in the manner of extending along the circumferential direction of main body (5).Accordingly, the floating and deviation of the reinforcing fiber of the fiber reinforced resin layer arranged outside the high-pressure storage tank inner container can be inhibited.

Description

Technical Field

[0001] This invention relates to a high-pressure storage tank liner, its manufacturing method, and the high-pressure storage tank itself. Background Technology

[0002] In the prior art, high-pressure storage tanks, used for filling high-pressure gases, are known to have a fiber-reinforced resin layer formed on the outside of a cylindrical inner liner (high-pressure storage tank liner) made of synthetic resin (see, for example, Patent Document 1). This inner liner is formed by welding cylindrical halves together. Furthermore, the welded portion of the halves is a cylindrical shape with an outer diameter larger than that of the general portion of the main body of the inner liner. Accordingly, a stepped portion is formed on the outer circumferential surface of the inner liner between the general portion and the welded portion.

[0003] Existing technical documents

[0004] Patent documents

[0005] International Publication No. 2019 / 131737 Summary of the Invention

[0006] Furthermore, in existing high-pressure storage tanks (see Patent Document 1), when a fiber-reinforced resin layer is formed on the outside of the inner liner, reinforcing fiber roving with a specified tension is wound onto the inner liner. However, there are concerns that the roving wound on the stepped portion of the inner liner may float on the general side of the inner liner, or that the strands forming the roving may deviate.

[0007] The technical problem to be solved by the present invention is to provide a high-pressure storage tank liner that suppresses the floating and deviation of the reinforcing fibers of the fiber-reinforced resin layer disposed on the outside of the high-pressure storage tank liner, a method for manufacturing the same, and a high-pressure storage tank.

[0008] The high-pressure storage tank liner of the present invention, which solves the above-mentioned technical problems, is characterized by having a main body, an enlarged diameter section, and a stepped section, wherein the main body is composed of a cylindrical body; the enlarged diameter section is formed in the main body and is composed of a cylindrical body with a diameter larger than the outer diameter of the general section of the main body; the stepped section is formed between the general section of the main body and the enlarged diameter section, and is composed of multiple steps, wherein the distance from the corner of the stepped section on the enlarged diameter section side through the corners of each step constituting the stepped section to the circumference of the general section is shorter than the transverse width of the reinforcing fiber roving, wherein the reinforcing fiber roving is arranged to extend circumferentially along the main body.

[0009] Furthermore, the manufacturing method of the high-pressure storage tank liner of the present invention, which solves the above-mentioned technical problems, includes the following steps: a step of joining the flange portions of a pair of liner halves together, wherein the pair of liner halves have a main body portion formed of a cylindrical body and the flange portion formed at an opening on one end side of the main body portion; a step of forming an enlarged diameter portion, wherein the enlarged diameter portion is formed by cutting the joint portion of the flange portions of the liner halves together along the circumference of the cylindrical body, and the enlarged diameter portion is formed by cutting a step portion formed between the general portion of the main body portion and the enlarged diameter portion, wherein the step portion is cut in such a way that the distance from the corner of the enlarged diameter portion side of the step portion through the corner of each step constituting the step portion to the circumference of the general portion is shorter than the transverse width of the reinforcing fiber roving, wherein the reinforcing fiber roving is arranged to extend circumferentially along the main body portion.

[0010] Furthermore, the high-pressure storage tank that solves the above-mentioned technical problems is characterized by having a high-pressure storage tank liner and a fiber-reinforced resin layer, wherein the high-pressure storage tank liner has a main body, an expanded diameter section, and a stepped section, the main body being composed of a cylindrical body; the expanded diameter section is formed in the main body and is composed of a cylindrical body with a diameter larger than the outer diameter of the general section of the main body; the stepped section is formed in a stepped section between the general section of the main body and the expanded diameter section, and is composed of multiple steps; the fiber-reinforced resin layer is arranged to cover the outer side of the high-pressure storage tank liner, and the reinforcing fiber roving constituting the fiber-reinforced resin layer is arranged to be wound around the outer peripheral surface of the high-pressure storage tank liner around the axis of the high-pressure storage tank liner, and its width is wider than the distance from the corner of the expanded diameter section side of the stepped section of the high-pressure storage tank liner, through the corners of each step constituting the stepped section, to the peripheral surface of the general section.

[0011] Invention Effects

[0012] According to the present invention, a method for manufacturing the same and a high-pressure storage tank can be provided, wherein a fiber-reinforced resin layer is formed on the outer side of the inner liner of the high-pressure storage tank, the floating and deviation of the reinforcing fibers constituting the fiber-reinforced resin layer are suppressed. Attached Figure Description

[0013] Figure 1 This is a longitudinal sectional view of the high-pressure storage tank involved in the embodiments of the present invention.

[0014] Figure 2 yes Figure 1 A partially enlarged sectional view of part II.

[0015] Figure 3A This is a longitudinal sectional view of a pair of inner tank halves used in the manufacturing method of the high-pressure storage tank inner tank according to the embodiments of the present invention.

[0016] Figure 3B yes Figure 3A A partially enlarged sectional view of section IIIb.

[0017] Figure 3C It is achieved through welding Figure 3A A partially enlarged cross-sectional view of the joint where a pair of inner liner halves meet.

[0018] Figure 3D Through the Figure 3C A partially enlarged cross-sectional view of the expanded diameter portion of the inner liner 2, which is formed by machining the joint.

[0019] Figure 3E Yes Figure 3D The diagram shows the process of performing stepped machining on the expanded diameter section.

[0020] Figure 4A This is a partially enlarged cross-sectional view schematically showing the appearance of the roving wound in the stepped portion of the inner liner of the high-pressure storage tank according to an embodiment of the present invention.

[0021] Figure 4B This is a partially enlarged cross-sectional view schematically showing the appearance of the roving wound around the stepped portion of the inner liner of the high-pressure storage tank involved in the first comparative example.

[0022] Figure 4C This is a partially enlarged cross-sectional view schematically showing the appearance of the roving wound around the stepped portion of the inner liner of the high-pressure storage tank involved in the second comparative example.

[0023] Figure 5A This is a partially enlarged cross-sectional view of the inner liner of the high-pressure storage tank involved in the first variation.

[0024] Figure 5B This is a structural illustration of the inner liner of the high-pressure storage tank involved in the second variation.

[0025] Figure 5C This is a partially enlarged cross-sectional view of the inner liner of the high-pressure storage tank involved in the third variation.

[0026] Explanation of reference numerals in the attached figures

[0027] 1: High-pressure storage tank; 2: Inner liner of high-pressure storage tank; 4: Fiber-reinforced resin layer; 5: Main body; 7: Roving; 8: General part of the main body; 8a: Circumferential surface of the general part; 9: Expanded diameter part of the main body; 11: Stepped part; 12: Stepped part; 13: Step; 13a: First step; 13b: Other steps; 14: Rising surface of the step; 15: Corner; 31: Inner liner half; 32: Flange part of the inner liner half; 33: Opening part of the inner liner half; 36: Joint of the flange parts; Ax: Axis of the inner liner of high-pressure storage tank; D: Distance; W: Lateral width of the roving. Detailed Implementation

[0028] Next, while referring appropriately to the appendix Figure 1 The embodiments for carrying out the present invention will be described in detail below.

[0029] First, the high-pressure storage tank of this embodiment and the high-pressure storage tank liner used in this embodiment will be described.

[0030] High-Pressure Storage Tanks

[0031] Figure 1 This is a longitudinal sectional view of the high-pressure storage tank 1 according to an embodiment of the present invention.

[0032] Imagine that the high-pressure storage tank 1 of this embodiment is installed in a fuel cell vehicle, for example, to store hydrogen for supplying to the fuel cell system. However, the high-pressure storage tank 1 is not limited to this and can also be used for other high-pressure gases.

[0033] like Figure 1 As shown, the high-pressure storage tank 1 has: a high-pressure storage tank liner 2 (hereinafter sometimes simply referred to as "liner 2") as described in detail below; an interface 3 connected to the liner 2; and a fiber-reinforced resin layer 4 that covers the liner 2 and the outer side of the interface 3 from the liner 2 to the interface 3.

[0034] The hypothetical interface 3 is formed, for example, of a metal material such as aluminum alloy. Interface 3 has: a cylindrical interface body 18 with a feed / discharge port 21 on its inner side; and a flange 19 formed at one axial end of the interface body 18. The feed / discharge port 21 communicates with the high-pressure storage tank 1 at the end where the flange 19 is formed. Furthermore, a piping (not shown) communicating with the aforementioned fuel cell system is connected to the other end of the feed / discharge port 21.

[0035] On the inner circumferential surface of the feed hole 21 at one end of the interface body 18, a threaded portion 21a is formed that engages with the threaded portion 17a formed in the cylindrical portion 17 of the inner liner 2, which will be described later. Furthermore, an O-ring (not shown) is installed between the top end of the cylindrical portion 17 of the inner liner 2 and the inner circumferential surface of the feed hole 21.

[0036] In addition, a cylindrical collar 22 made of metal is disposed inside the inlet / outlet hole 21. The collar 22 extends from one end supported on the inner circumferential surface of the inlet / outlet hole 21 toward the inner liner 2 and is embedded in the cylindrical portion 17 of the inner liner 2.

[0037] Imagine that the fiber-reinforced resin layer 4 in this embodiment is obtained by winding a pre-impregnated material, in which reinforcing fibers are pre-impregnated with matrix resin, around the outer peripheral surfaces of the inner liner 2 and the interface 3, and then hardening the matrix resin.

[0038] As the reinforcing fiber in this embodiment, it is hypothetically assumed that a strip-shaped roving 7 (described later) is formed by winding multiple strands of yarn composed of multiple carbon fiber yarns around a ply. Figure 2 However, the reinforcing fibers are not limited to these; for example, aramid fibers, boron fibers, alumina fibers, silicon carbide fibers, etc., can also be used.

[0039] As the matrix resin in this embodiment, for example, it is hypothetically a matrix resin composed of a cured product of a thermosetting resin such as epoxy resin, phenolic resin, unsaturated polyester resin, or polyimide resin.

[0040] Furthermore, the method for forming the fiber-reinforced resin layer 4 is not limited to using the aforementioned prepreg material. Therefore, the fiber-reinforced resin layer 4 can also be obtained, for example, by impregnating the unimpregnated reinforcing fibers wound on the inner liner 2 with matrix resin and then curing them.

[0041] High-Pressure Storage Tank Inner Liner

[0042] The inner liner 2 is a hollow body made of thermoplastic resin. Examples of thermoplastic resins include polyamide resin and polyethylene resin, but it is not limited to these.

[0043] The inner liner 2 of this embodiment has a main body 5 made of a cylindrical body and end portions 6 integrally formed at both ends of the main body 5.

[0044] The main body 5 is configured to have: a general part 8, which is formed with a predetermined outer diameter and occupies most of the axis (Ax) direction of the main body 5; and an enlarged diameter part 9, which is formed in the central part of the axis (Ax) direction of the main body 5 and has a larger diameter than the general part 8.

[0045] As detailed in the "Manufacturing Method of High-Pressure Storage Tank Inner Liner" described later, the expanded diameter section 9 is achieved by welding together a pair of inner liner halves 31 (see reference). Figure 3A The joint 36 (refer to) where the ends of the parts ... Figure 3C It is formed by cutting and machining.

[0046] Figure 2 yes Figure 1 A partially enlarged sectional view of part II.

[0047] like Figure 2 As shown, in the step portion 11 formed between the general portion 8 and the enlarged diameter portion 9 of the main body portion 5, a stepped portion 12 composed of multiple steps is formed from the side of the general portion 8 to the side of the enlarged diameter portion 9. In addition, it is assumed that the number of steps of the stepped portion 12 in this embodiment is 2, but as will be described later, the number of steps of the stepped portion 12 can also be 3 or more.

[0048] Furthermore, in this stepped section 12, the rising surface 14 of the step 13b, which is one of the multiple steps 13 constituting the stepped section 12 except for the first step 13a formed closest to the general section 8, is an inclined surface.

[0049] Furthermore, in this embodiment, the rising surface 14 corresponds to the surface that rises from the so-called tread surface in a stepped structure where the general part 8 is considered as a step below and the enlarged diameter part 9 is considered as a step above. Also, in this embodiment, the rising surface 14 gradually moves further away from the axis of the cylinder as it moves from the general part 8 towards the enlarged diameter part 9 (see reference). Figure 1 The attached figure is tilted in the manner indicated by the reference numeral Ax.

[0050] Figure 2 Reference numeral 4 in the figures indicates a fiber-reinforced resin layer, and reference numeral 7 indicates a roving extending circumferentially along the main body 5 on the stepped portion 12, shown in its cross-section.

[0051] And, as Figure 2 As shown, the step portion 12 is formed such that the distance D from the corner portion 15 of the expanded diameter portion 9 side of the step portion 11 to the circumferential surface 8a of the general portion 8 through the corner portion 15 of the step 13 formed between the expanded diameter portion 9 and the general portion 8 is shorter than the transverse width W of the roving 7.

[0052] like Figure 1 As shown, the end portion 6 is a flat, bowl-shaped body that gradually narrows as it moves away from the main body portion 5 in the direction of the axis (Ax) outward.

[0053] The radial center of the end 6 has a recessed portion 16 that is recessed in a manner corresponding to the shape of the flange portion 19 of the interface 3.

[0054] Furthermore, a cylindrical portion 17 is formed in the center of the recessed portion 16, protruding into the feed hole 21 of the interface 3. A threaded portion 17a, engaging with the threaded portion 21a of the feed hole 21, is formed on the outer peripheral surface of the cylindrical portion 17.

[0055] Manufacturing Method of Inner Liner for High-Pressure Storage Tanks

[0056] Next, for inner liner 2 (refer to...) Figure 1 The manufacturing method of ) will be explained.

[0057] Figure 3A The inner liner 2 involved in this embodiment (refer to...) Figure 1 A longitudinal sectional view of a pair of inner liner halves 31 used in the manufacturing method of ). Figure 3B yes Figure 3A A partially enlarged sectional view of section IIIb. Figure 3C It is achieved through welding Figure 3A A partially enlarged cross-sectional view of the joint 36 where a pair of inner liner halves 31 are joined together. Figure 3D Through the Figure 3C A partially enlarged cross-sectional view of the enlarged diameter portion 6 of the inner liner 2, which is formed by cutting the joint portion 36. Figure 3E Yes Figure 3D The diagram shows the process of performing stepped machining on the expanded diameter section 6.

[0058] like Figures 3A to 3E As shown, the inner liner 2 involved in this embodiment (refer to...) Figure 1 The manufacturing method of the inner liner half 31 mainly includes: a preparation process for the inner liner half 31; a joining process for integrally joining the inner liner half 31 together by welding; and a cutting process for machining the joint 36 of the integral inner liner half 31 together.

[0059] like Figure 3A As shown, a pair of inner liner halves 31 are prepared in the above preparation process.

[0060] In addition to the flange portion 32 described below, the inner liner half 31 has a central portion that is axially aligned with the flange portion 32. Figure 1 The inner liner 2 shown is divided into two roughly identical parts.

[0061] This inner liner half 31 can be formed by injection molding, blow molding, etc.

[0062] like Figure 3B As shown, flange portions 32 and protruding ends 34 are formed on the opening 33 sides of the inner liner halves facing each other, and the protruding ends 34 have a melting range 35, which will be described in detail later.

[0063] The flange portion 32 is integrally formed with the main body portion 5 in such a way that it extends radially outward from the main body portion 5 in the inner liner half 31, and is an annular body coaxial with the main body portion 5.

[0064] A circumferential groove 32a is formed in the flange portion 32.

[0065] The circumferential groove 32a is formed on the flange face 32b that rises from the circumferential surface of the main body portion 5 in the inner liner half 31 in a circumferentially extending manner. That is, the circumferential groove 32a is formed on the flange face 32b that is farther away from the opening 33 of the inner liner half 31 from the pair of flange faces 32b that are arranged in a manner that are axially aligned with the inner liner half 31.

[0066] Additionally, a pressing fixture (illustration omitted) is embedded in this circumferential groove 32a. Furthermore, as... Figure 3A As shown, the pressing fixture presses the inner liner halves 31, which are arranged with their openings 33 facing each other, with a specified load.

[0067] like Figure 3B As shown, the protruding end 34 is an annular body coaxial with the main body 5, which is integrally formed with the end face of the opening 33 side of the inner liner half 31.

[0068] The outer diameter of the protruding end 34 is set to be larger than the outer diameter of the main body 5 in the inner liner half 31, and smaller than the outer diameter of the flange 32.

[0069] In addition, the inner diameter of the protruding end 34 is set to be the same as the inner diameter of the inner liner half 31.

[0070] Furthermore, the thickness of the protruding end 34 on the axial Ax of the inner liner half 31 is thicker than the fusion range 35 when the inner liner half 31 is welded together, as described later.

[0071] Next, in the process of joining the inner liner halves 31 together, Figure 3B The molten range 35 of the protruding end 34 shown is heated and melted to join the inner liner halves 31 together.

[0072] As a melting method for the melting range 35 in this embodiment, it is conceivable to use a heater to heat the protruding end 34, or to use the frictional heat between the inner liner halves 31. In addition, the frictional heat between the inner liner halves 31 can be generated by pressing the inner liner halves 31 together with a predetermined load using the aforementioned pressing jig (not shown) while generating relative displacement through vibration or the like.

[0073] Furthermore, in this joining process, such as Figure 3C As shown, the inner liner halves 31 are pressed together with a specified load using a pressing jig (illustration omitted), causing the melting area 35 (see reference) to be molten. Figure 3B The molten material 35a flows in a direction intersecting the pressing direction (axis Ax direction) of the inner liner halves 31. Accordingly, the molten material 35a of the inner liner halves 31 fuses together at the welding surface 36a shown by the imaginary line (double-dotted line). Then, the molten material 35a is cooled, thereby connecting the inner liner halves 31 integrally at the welding surface 36a.

[0074] Next, in the cutting process of the integrated inner liner halves 31, such as Figure 3D As shown, for the flange portion 32 in the joint portion 36 (shown by the imaginary line (double-dotted line)), its root portion 32c is retained, and the flange portion 32 is removed by cutting.

[0075] Then, the enlarged diameter portion 9 in the inner liner 2 is formed through the remaining root portion 32c.

[0076] In addition, in this cutting process, such as Figure 3E As shown, the stepped portion 11 formed between the general portion 8 and the enlarged diameter portion 9 of the main body portion 5 is cut to form a stepped portion 12 composed of multiple steps. Specifically, as shown... Figure 3E As shown in the upper part of the figure, a rotating tool with a frustum-shaped cutting tool head 37 approaches the stepped portion 11 in a manner along the axial direction Ax of the main body portion 5.

[0077] And, as Figure 3E As shown in the middle of the diagram, the cutting tool head 37 begins cutting the stepped portion 11. At this time, the height of the first step 13a in the stepped portion 12 is determined based on the distance between the cutting tool head 37 and the general portion 8 of the main body portion 5.

[0078] Next, as Figure 3E As shown in the lower part of the figure, the cutting tool head 37 further performs cutting, thereby forming a stepped section 12 consisting of a first step 13a and a step 13b with an inclined rising surface 14.

[0079] In addition, such as Figure 2 As shown, a high-pressure storage tank 1 is manufactured by winding reinforcing fiber roving 7 around the main body 5 of the inner liner 2, which includes such stepped portion 12. As a result, as described above, the distance D of the stepped portion 12 is shorter than the lateral width W of the roving 7.

[0080] Then, this stepped portion 12 is formed in the enlarged diameter portion 9, and the inner liner 2 of this embodiment (see reference) Figure 1 The series of manufacturing processes are completed.

[0081] Effects and Functions

[0082] Next, the high-pressure storage tank liner 2 of this embodiment, its manufacturing method, and the effects of the high-pressure storage tank 1 will be explained.

[0083] Figure 4A This is a partially enlarged cross-sectional view schematically showing the appearance of the roving 7, which is a reinforcing fiber wound as a stepped portion 12 of the inner liner 2 in the embodiment. Figure 4BThis is a partially enlarged cross-sectional view schematically showing the appearance of the reinforcing fiber roving 7 wound as part of the stepped portion 11 of the inner lining 40a involved in the first comparative example. Figure 4C This is a partially enlarged cross-sectional view schematically showing the appearance of the reinforcing fiber roving 7 wound around the stepped portion 11 of the inner lining 40b involved in the second comparative example.

[0084] Here, we will first describe the inner liner 40a involved in the first comparative example and the inner liner 40b involved in the second comparative example.

[0085] like Figure 4B As shown, the inner liner 40a involved in the first comparative example does not have a stepped section 12 composed of multiple steps in the stepped section 11 between the general section 8 and the enlarged diameter section 9. Figure 4A Except for the inner liner 2 of this embodiment, it is formed in the same manner.

[0086] When the roving 7 is wound on the stepped portion 11 of the inner liner 40a, the roving 7 floats up L on the general portion 8 side of the inner liner 40a. In addition, when the roving 7 with a specified tension is wound on the stepped portion 11 in the inner liner 40a, sometimes the corner portion 15 of the diameter expansion portion 9 enters between the strands forming the roving 7 (not shown) and causes the strands to deviate.

[0087] In addition, such as Figure 4C As shown, the inner liner 40b of the second comparative example is configured such that, compared with the inner liner 40a of the first comparative example (refer to...), Figure 4B The corner 15 (refer to) Figure 4B The corresponding part has a chamfered portion 15a (surface C).

[0088] When the roving 7 is wound around the stepped portion 11 of this inner liner 40b, it is similar to the inner liner 40a involved in the first comparative example (see reference). Figure 4B Similarly, it is believed that the roving 7 on the general part 8 side of the inner liner 40b is raised L, and the ply (not shown) is deviated due to the corner 15 of the stepped part 11.

[0089] Furthermore, in the inner liner of the prior art (for example, see Patent Document 1), in most cases the welding surface 36a (see...) Figure 3C The diameter expansion section 9 is bent due to machining errors. Therefore, a chamfered portion 15a is formed on one end side of the stepped portion 11 formed at both ends in the direction of the axis Ax of the diameter expansion section 9 (see reference). Figure 4B Another part is the corner 15 where the stepped part 11 is retained (see reference). Figure 4B ).

[0090] In this regard, such as Figure 4A As shown, in this embodiment, the inner liner 2 is such that the distance D of the stepped portion 12, which is composed of multiple steps, is shorter than the lateral width W of the roving 7.

[0091] According to this inner liner 2, the roving 7, which is subjected to a predetermined tension on the stepped portion 12, is supported at three points: the corner 15 on the side of the expanded diameter portion 9; the circumferential surface 8a of the general portion 8; and the corner 15 of the first step 13a constituting the stepped portion 12. Accordingly, the reaction force of the roving 7 subjected to tension from the inner liner 2 side is distributed to these three points, thereby suppressing the deviation of the ply (not shown).

[0092] Furthermore, according to this inner liner 2, by forming a stepped section 12 consisting of multiple steps in the expanded diameter section 9, the buoyancy L of the roving 7 on the steps of the general section 8 and the expanded diameter section 9 of the inner liner 2 is reduced.

[0093] Furthermore, in this embodiment, the rising surface 14 of the inner liner 2 is an inclined surface. Therefore, the corners 15 of the steps 13b other than the first step 13a are obtuse angles. The wedge effect of the corners 15 between the strands forming the roving 7 (not shown) is greater than that of the inner liner 40a involved in the first comparative example (see reference). Figure 4B This reduces the deviation of the stock line (illustration omitted).

[0094] Furthermore, in this embodiment, the rising surface 14 of the inner liner 2 is an inclined surface, so the levitation L of the roving 7 relative to the inner liner 2 in the stepped portion 11 is further reduced.

[0095] The above description of this embodiment is not limited to the above embodiment and can be implemented in various other ways.

[0096] In the above embodiments, an example is given of an inner liner 2 having a stepped section 12 with two levels and a high-pressure storage tank 1 having the inner liner 2 (see reference). Figure 2 ).

[0097] However, the number of steps 12 in the inner liner 2 is not limited to this, and can also be 3 or more.

[0098] Figure 5A This is a partially enlarged sectional view of the inner liner 2 involved in the first modified example.

[0099] like Figure 5A As shown, the inner liner 2 involved in the first modification example, except that the number of steps in the stepped portion 12 is 3, is the same as the inner liner 2 of the above embodiment (refer to...). Figure 1 It forms in the same way.

[0100] According to the inner liner 2 involved in this first variation, the roving 7 on the inner liner 2 (refer to...) Figure 2 The number of support points increases further according to the grade, thereby further suppressing the roving 7 (refer to Figure 4A ) Relative to the inner liner 2 floating L (refer to) Figure 4AThe deviation between the stock line and the stock line.

[0101] Figure 5B This is a structural illustration of the inner liner 2 involved in the second variation. Figure 5B This is a development diagram showing the cross-section and circumferential surface of the inner liner 2 as a single plane. Furthermore, to facilitate the explanation of this modified example, Figure 5B The size and shape of the undulating Ud shown are exaggerated and differ from their actual size and shape.

[0102] like Figure 5B As shown, in the second modified example, the stepped portion 12 of the inner liner 2 is alternately formed on one end side and the other end side along the circumferential direction Cd of the expanded diameter portion 9 in the direction of the axis Ax of the expanded diameter portion 9.

[0103] Figure 5B In the attached drawing, reference numeral Ud indicates an undulation formed at one end and the other end of the enlarged diameter portion 9 in the axial direction Ax due to the bending of the welding surface 36a. That is, the undulation Ud is formed by the bending of the enlarged diameter portion 9 along the circumferential direction Cd. Furthermore, at one end and the other end of the enlarged diameter portion 9 in the axial direction Ax, portions with the first step 13a and portions without the first step 13a alternate according to the period of the undulation Ud. Accordingly, in the second modified example, the inner liner 2 has stepped portions 12 alternately formed along the circumferential direction Cd.

[0104] According to the inner liner 2 involved in this second modification, the roving 7 can be suppressed by the stepped portion 12 formed on one end or the other end of the diameter-expanding portion 9 (see reference). Figure 4A ) floats up L (refer to) Figure 4A The deviation between the stock line and the stock line (illustration omitted).

[0105] In the above embodiment, it is shown that the stepped portion 12 of the inner liner 2 is formed at both ends of the cylindrical body of the enlarged diameter portion 9 in the axial direction Ax (see reference). Figure 2 The stepped portion 12 of the inner liner 2 is formed on at least one end side of the cylindrical body of the enlarged diameter portion 9 along the axial direction.

[0106] Figure 5C This is a partially enlarged sectional view of the inner liner 2 involved in the third variation.

[0107] like Figure 5C As shown, in the third modified example, the inner liner 2 has a stepped portion 12 formed only on one end of the cylindrical body of the expanded diameter portion 9 along the axis Ax. Additionally, a chamfered portion 15a (C-surface) is formed on the other end of the expanded diameter portion 9.

[0108] According to the inner liner 2 involved in this third modification, the roving 7 can be suppressed by the stepped portion 12 formed at one end (see reference). Figure 4A ) floats up L (refer to) Figure 4AThe deviation between the yarn and the ply (not shown). In addition, the load on the fiber yarn (not shown) is reduced by forming a chamfered portion 15a (C surface) on the other end side.

Claims

1. A high-pressure storage tank, characterized in that, It has a high-pressure storage tank liner and a fiber-reinforced resin layer, wherein, The high-pressure storage tank inner liner has a main body, an enlarged diameter section, and a stepped section. The main body is composed of a cylindrical body. The enlarged diameter section is formed in the main body and is composed of a cylindrical body with a diameter larger than the outer diameter of the general section of the main body. The stepped section is a stepped section formed axially between the general section and the enlarged diameter section of the main body, and consists of two or more steps. The fiber-reinforced resin layer is composed of reinforcing fibers and is configured to cover the outer side of the inner liner of the high-pressure storage tank. The distance from the corner of the expanded diameter portion of the stepped portion, through the corners of each step constituting the stepped portion, to the circumference of the general portion is shorter than the transverse width of the roving of the reinforcing fiber, wherein the roving of the reinforcing fiber is arranged to extend circumferentially along the main body portion.

2. The high-pressure storage tank according to claim 1, characterized in that, The stepped portion is formed on at least one end side of the cylindrical body of the expanded diameter portion along the axial direction.

3. The high-pressure storage tank according to claim 1, characterized in that, The stepped portion is alternately formed along the circumference of the expanded diameter portion on one end and the other end of the cylindrical body of the expanded diameter portion.

4. The high-pressure storage tank according to any one of claims 1 to 3, characterized in that, The rising surfaces of the steps that constitute the multi-level steps of the stepped portion, excluding the first step which is closest to the general portion, which rise in a direction away from the axis of the cylinder, are formed by inclined surfaces, wherein the inclined surfaces are inclined in a manner that gradually move away from the axis of the cylinder as they move from the general portion side toward the expanded diameter portion side.

5. A method for manufacturing a high-pressure storage tank liner, characterized in that, It has the following processes: A process of joining the flange portions of a pair of inner liner halves together, wherein the pair of inner liner halves have a main body portion made of a cylindrical body and the flange portion formed by an opening at one end of the main body portion. The process of forming the enlarged diameter section involves cutting the joint between the flanges of the inner liner half along the circumference of the cylindrical body to form the enlarged diameter section, which is a cylindrical body with a diameter larger than the outer diameter of the general part of the main body. The process of forming a stepped section involves cutting a stepped section formed between the general section and the enlarged diameter section of the main body to form a stepped section consisting of multiple steps. In the process of forming the stepped portion, the stepped portion is cut in such a way that the distance from the corner of the expanded diameter portion side of the stepped portion through the corners of each step constituting the stepped portion to the circumferential surface of the general portion is shorter than the transverse width of the reinforcing fiber roving, wherein the reinforcing fiber roving is arranged to extend circumferentially along the main body portion.

6. A high-pressure storage tank, characterized in that, It has a high-pressure storage tank liner and a fiber-reinforced resin layer, wherein, The high-pressure storage tank inner liner has a main body, an enlarged diameter section, and a stepped section. The main body is composed of a cylindrical body. The enlarged diameter section is formed in the main body and is composed of a cylindrical body with a diameter larger than the outer diameter of the general section of the main body. The stepped section is a stepped section formed in the axial direction of the main body between the general section and the enlarged diameter section, and consists of two or more steps. The fiber-reinforced resin layer is configured to cover the outer side of the inner liner of the high-pressure storage tank. The rovings of the reinforcing fibers constituting the fiber-reinforced resin layer are arranged to be wound around the outer peripheral surface of the high-pressure tank liner around the axis of the high-pressure tank liner, and their width is wider than the distance from the corner of the expanded diameter portion of the stepped portion of the high-pressure tank liner, through the corners of each step constituting the stepped portion, to the peripheral surface of the general portion.

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