High-pressure tank and method of manufacturing the same

Abstract

The present invention relates to a high-pressure tank and a method for manufacturing the same. The present invention provides a method for manufacturing a high-pressure tank capable of stably restraining a metal cylindrical body at the neck of the liner. The method for manufacturing a high-pressure tank (10) comprises preparing a liner (11) made of a thermoplastic resin, the liner (11) having a main body (14) with a storage space (S) formed therein, and a neck (15) continuous with the main body (14) and having an opening (13). The neck (15) is inserted into a metal cylindrical body (40) having a concave retaining portion (43) formed on the inner circumference (41), and the cylindrical body (40) is arranged on the neck (15). The neck (15) is hot-pressed from the inner circumferential surface (41) of the neck (15) toward the cylindrical body (40) in such a manner that the neck (15) imitates the inner circumferential surface (41) of the cylindrical body (40), so that the neck (15) is locked in the locking portion (43) and forms a reinforcement layer (12) on the lining (11) together with the cylindrical body (40).

Description

Technical Field

[0001] The present invention relates to a high-pressure tank and a method for manufacturing the same. Background Art

[0002] For example, natural gas vehicles and fuel cell vehicles utilize high-pressure tanks for storing fuel gas. These high-pressure tanks include a liner for storing a fluid, namely, a high-pressure gas, and a reinforcement layer made of fiber-reinforced resin covering the outer circumference of the liner.

[0003] When manufacturing a high-pressure tank, a thermoplastic resin liner is first prepared. The liner consists of a main body defining a chamber for accommodating high-pressure gas and a neck portion continuous with the end of the main body. Within this prepared liner, a reinforcement layer made of fiber-reinforced resin is formed on the outer circumferences of the main body and neck portion.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 2020-112189 Summary of the Invention

[0007] Problems to be solved by the invention

[0008] For example, in order to ensure the sealing properties of the high-pressure tank or the strength of the neck, a metal cylindrical body can be placed between the liner and the reinforcement layer in the neck portion of the liner of Patent Document 1. However, due to the thermal stress difference between the liner and the cylindrical body during tank use, fluctuations in the internal pressure of the tank, and other factors, the cylindrical body may not be restrained by the liner and the reinforcement layer, which may affect the strength of the high-pressure tank.

[0009] The present invention has been made in view of such problems, and provides a high-pressure tank and a method for manufacturing the same, in which a metal cylindrical body can be stably restrained at a neck of a liner.

[0010] Technical solutions to problems

[0011] In view of the above-mentioned problems, the manufacturing method of the high-pressure tank involved in the present invention is the following manufacturing method of the high-pressure tank, which has: a liner, which forms a storage space for storing a fluid and has an opening formed on at least one end side; and a reinforcement layer, which covers the outer surface of the liner and is composed of fiber-reinforced resin, and is characterized in that the manufacturing method of the high-pressure tank at least includes: a process of preparing the liner composed of thermoplastic resin, the liner having a main body forming the storage space, and a neck continuous with the main body and formed with the opening; a process of inserting the neck into a metal cylindrical body with a convex or concave locking portion formed on the inner circumference, and arranging the cylindrical body on the neck; a process of hot-pressing the neck from the inner circumference of the neck toward the cylindrical body in a manner that the neck imitates the inner circumference of the cylindrical body, so that the neck is locked to the locking portion; and a process of forming a reinforcement layer on the liner together with the cylindrical body.

[0012] According to the present invention, with the cylindrical body positioned within the neck, the neck is hot-pressed from the inner circumference of the neck toward the cylindrical body, with the neck conforming to the inner circumference of the cylindrical body. This allows the neck to be secured to the securing portion of the inner circumference of the cylindrical body. This ensures that the metal cylindrical body is stably restrained within the neck of the liner, thereby preventing a reduction in the strength of the high-pressure tank due to the metal cylindrical body becoming unconstrained.

[0013] Here, as long as the cylindrical body can be locked relative to the neck by the locking portion, the number and configuration of the locking portions are not particularly limited. However, as a more preferred embodiment, the locking portions are a plurality of convex portions or a plurality of concave portions formed at intervals in the circumferential direction of the inner peripheral surface.

[0014] According to this embodiment, the cylindrical body is constrained by the neck of the liner by the plurality of convex portions or concave portions formed in the circumferential direction on the inner peripheral surface of the cylindrical body, thereby preventing the cylindrical body from rotating about the axis relative to the liner.

[0015] In a more preferred embodiment, the inner circumferential surface of the end portion located on the opening side of the two ends of the cylindrical body is shaped to expand in the radial direction of the cylindrical body, and in the step of locking the neck portion, the neck portion is hot-pressed to follow the inner circumferential surface of the end portion. According to this embodiment, since the neck portion of the liner is hot-pressed to follow the inner circumferential surface of the end portion of the cylindrical body located on the opening side, the cylindrical body can be more reliably prevented from coming out of the opening side of the liner.

[0016] The present invention also discloses a high-pressure tank. The high-pressure tank includes: a liner having a storage space for storing a fluid and an opening formed at at least one end; and a reinforcement layer covering the outer surface of the liner and made of a fiber-reinforced resin. The liner is made of a thermoplastic resin and includes a main body having the storage space formed therein and a neck having the opening formed therein. A metal cylindrical body having a convex or concave locking portion formed on its inner circumference is disposed between the neck and the reinforcement layer, and the neck is locked to the locking portion.

[0017] According to the present invention, the neck portion can be locked to the locking portion on the inner circumferential surface of the cylindrical body. Thus, the metal cylindrical body can be stably constrained to the neck portion of the liner, thereby preventing a reduction in the strength of the high-pressure tank due to the metal cylindrical body becoming unconstrained.

[0018] Here, as long as the cylindrical body can be constrained relative to the neck by the locking portions, the number and arrangement of the locking portions are not particularly limited. However, as a more preferred embodiment, the locking portions are a plurality of protrusions or recesses formed at intervals in the circumferential direction of the inner circumferential surface. According to this embodiment, the plurality of protrusions or recesses formed in the circumferential direction on the inner circumferential surface of the cylindrical body are locked with the neck, so that the cylindrical body is constrained by the neck of the liner. Therefore, it is possible to prevent the cylindrical body from rotating around the axis relative to the liner.

[0019] As a more preferred embodiment, the inner peripheral surface of the end portion located on the opening side of the both end portions of the cylindrical body is shaped to expand in the radial direction of the cylindrical body, and the neck portion expands in the radial direction in a manner similar to the inner peripheral surface of the end portion.

[0020] According to this aspect, the neck portion of the liner expands in the radial direction so as to follow the inner peripheral surface of the end portion of the cylindrical body disposed on the opening side, and thus the cylindrical body can be more reliably prevented from coming out of the opening side of the liner.

[0021] Effects of the Invention

[0022] According to the present invention, the metal cylindrical body at the neck portion of the liner can be stably constrained. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a perspective view showing the structure of a tank unit including a high-pressure tank according to the present embodiment.

[0024] Figure 2 It is along Figure 1 A cross-sectional view of the AA line high-pressure tank unit.

[0025] Figure 3A yes Figure 2 An enlarged sectional view of the main parts of the tank unit on the bracket side is shown.

[0026] Figure 3B yes Figure 2 An enlarged cross-sectional view of the main portion of the tank unit on the manifold side is shown.

[0027] Figure 4A It is along Figure 3A A cross-sectional view of the high-pressure tank taken along line BB is shown.

[0028] Figure 4B yes Figure 4A A cross-sectional view of a modified example of the high-pressure tank shown.

[0029] Figure 5A Is used to illustrate Figure 3A A cross-sectional view showing a step of preparing a liner and a step of arranging a cylindrical body in a method of manufacturing a high-pressure tank.

[0030] Figure 5B It is along Figure 5A A schematic cross-sectional view of the high-pressure tank taken along line CC is shown.

[0031] Figure 6A It is used to explain the card stop Figure 5A A cross-sectional view of the process of manufacturing the neck of the high-pressure tank is shown.

[0032] Figure 6B It is along Figure 6A A schematic cross-sectional view of the high-pressure tank is shown along line DD.

[0033] Figure 7 Is used to illustrate Figure 6A A cross-sectional view showing the process of forming a reinforcement layer for the liner of a high-pressure tank. DETAILED DESCRIPTION

[0034] 1. About high pressure tank 10

[0035] Below, first, refer to Figures 1 to 4B Next, an embodiment of the tank unit 1 including the high-pressure tank 10 will be described. Figure 1 and Figure 2 As shown, the tank unit 1 according to the present embodiment includes a high-pressure tank 10 and a pair of connection members 30 , 30 connected to both ends of the high-pressure tank 10 .

[0036] The high-pressure tank 10 is a tank mounted on a fuel cell vehicle and filled with high-pressure hydrogen. The gas that can be filled into the high-pressure tank 10 is not limited to high-pressure hydrogen. It can also be filled with compressed gases such as CNG (compressed natural gas), various liquefied gases such as LNG (liquefied natural gas) and LPG (liquefied petroleum gas), and other gases (fluids). It can also be temporarily filled with fluids such as liquids for pressure testing.

[0037] The high-pressure tank 10 includes a liner 11 having a storage space S for storing hydrogen gas and openings 13 formed on both sides thereof, and a reinforcement layer 12 laminated on the liner 11 so as to cover the outer peripheral surface 11a of the liner 11. The liner 11 is made of a material having gas barrier properties, and the reinforcement layer 12 is made of a fiber-reinforced resin.

[0038] The liner 11 includes a main body 14 containing the aforementioned accommodation space S, and a pair of necks 15, 15, which are continuous with the ends of the main body 14 and form an opening 13. In this embodiment, the necks 15, 15 are formed on both sides of the liner 11, but the high-pressure tank 10 may also have a bottle-shaped structure with the neck 15 formed only on one side.

[0039] The reinforcing layer 12 is laminated on the main body 14 and the neck 15. In this embodiment, a metal cylindrical body 40, described later, is disposed as an intermediate layer between the neck 15 and the reinforcing layer 12. Furthermore, the cylindrical body 40, described later, may cover a portion of the outer peripheral surface 15b of the neck 15. However, as long as the sealing properties described later are ensured, the cylindrical body 40 may cover only a portion of the outer peripheral surface 15b of the neck 15, with the remaining surface (specifically, the outer peripheral surface on the opening 13 side) being covered with the reinforcing layer 12.

[0040] In this embodiment, the main body 14 includes a cylindrical main body 14a, which is an example of a cylindrical shape, and a shoulder 14b, the inner and outer diameters of which decrease as they move from the main body 14a toward the end of the main body 14. The shoulder 14b is a truncated cone-shaped cylindrical portion, and a neck 15 is formed so as to be continuous with the shoulder 14b.

[0041] In this embodiment, an annular joint 20 is attached to the outer circumferential surface 12a of the reinforcement layer 12 covering the neck 15. Multiple protrusions are formed on the inner circumferential surface 22 of the joint 20, and the reinforcement layer 12 is formed so as to bite into the inner circumferential surface 22 (specifically, into the spaces between the protrusions). This allows the joint 20 to be secured to the reinforcement layer 12. External threads are formed on the outer circumferential surface 21 of the joint 20, which can be threadedly engaged with internal threads formed on the inner wall surface 34 of the connecting member 30, described later.

[0042] Here, in this embodiment, a resin having excellent gas barrier properties is preferably used as the resin constituting the liner 11. Examples of such resins include thermoplastic resins such as polypropylene resins, nylon resins (e.g., 6-nylon resin or 6,6-nylon resin), polycarbonate resins, acrylic resins, ABS resins, polyamide resins, polyethylene resins, ethylene-vinyl alcohol copolymer resins (EVOH), and polyester resins.

[0043] The reinforcing layer 12 is formed by impregnating a thermoplastic resin or a thermosetting resin as a matrix resin into a reinforcing fiber. In the present embodiment, the reinforcing fiber is a fiber bundle. As the reinforcing fiber, reinforcing fibers such as glass fiber, aromatic polyamide fiber, boron fiber and carbon fiber can be used. In particular, from the viewpoints of lightness and mechanical strength, carbon fiber is preferably used. As the matrix resin, a thermosetting resin is preferably used. As the thermosetting resin, a phenolic resin, a melamine resin, a urea resin or an epoxy resin is preferably used. From the viewpoints of mechanical strength, an epoxy resin precursor is preferably used. The epoxy resin has fluidity in the uncured state and becomes an epoxy resin having a strong cross-linked structure after thermal curing.

[0044] The reinforcing layer 12 is formed by winding a fiber bundle impregnated with a matrix resin around the outer peripheral surface 11a of the liner 11 by a filament winding method or a sheet winding method. The reinforcing layer 12 may be a spirally wound layer in which the fiber bundle is wound so as to be inclined relative to the axis CL of the high-pressure tank 10. For example, the reinforcing layer 12 may be a layer in which the fiber bundle is woven so as to be inclined relative to the axis CL of the high-pressure tank 10.

[0045] The pair of connection members 30, 30 are made of metal such as aluminum or steel and are composed of a bracket 30A and a manifold 30B. The bracket 30A is a member for integrally restraining the plurality of high-pressure tanks 10, 10, ... and mounting them on the vehicle.

[0046] The manifold 30B is a component forming a gas flow path, which introduces hydrogen into the storage space S of the high-pressure tank 10 and releases hydrogen from the storage space S. Figure 3A and Figure 3B As shown, the bracket 30A and the manifold 30B differ mainly in the presence or absence of a gas flow path, so refer to Figure 3B The structure of the manifold 30B serving as the connecting member 30 will be described.

[0047] The manifold 30B is formed to cover the opening 13 formed at the end of the high-pressure tank 10 in the direction of the axis CL. The manifold 30B includes an insertion portion 31 and a cover portion 32. The cover portion 32 is a portion that is threadedly connected to the outer peripheral surface 21 of the joint 20 and covers the end surface of the high-pressure tank 10. The insertion portion 31 is formed in the center of the cover portion 32.

[0048] The insertion portion 31 is a plug-shaped portion that is inserted from the opening 13 along the inner circumferential surface 15a of the neck 15. An annular groove 35 is formed along the circumference of the outer circumferential surface 31a of the insertion portion 31. Annular sealing members 61 and 62 are disposed in the annular groove 35 to seal the housing space S. The sealing members 61 and 62 are made of an elastic material such as a resin material or a rubber material having gas barrier properties.

[0049] In this embodiment, the high-pressure tank 10 includes a cylindrical body 40 between the neck 15 and the reinforcement layer 12, surrounding the outer peripheral surface 15b of the liner 11 and at a position facing the sealing members 61 and 62. The cylindrical body 40 is a member that restricts deformation of the inner peripheral surface 15a of the neck 15 from expanding in the radial direction.

[0050] The material of the cylindrical body 40 is a metal material such as stainless steel or aluminum steel, and the material is not particularly limited as long as it can restrict the deformation of the inner peripheral surface 15 a of the neck portion 15 that expands in the radial direction.

[0051] Here, the so-called "deformation of the inner circumferential surface 15a of the neck 15 in the radial direction" refers to the deformation of the lining 11 forming the neck 15 (more specifically, the part of the lining 11 that abuts against the sealing parts 61 and 62) in the radial direction due to the hoop stress generated in the neck 15 due to the pressure of hydrogen.

[0052] Furthermore, the inner peripheral surface (opposing surface) 41 of the cylindrical body 40 abuts against the outer peripheral surface 15b of the neck 15. Figure 4A As shown, a recessed locking portion 43 is formed on the inner peripheral surface 41 of the cylindrical body 40 between the neck portion 15 and the reinforcing layer 12. In this embodiment, the neck portion 15 is locked to the locking portion 43.

[0053] Specifically, the locking portion 43 is a recessed portion 43A, and in this embodiment, it is a groove-shaped recessed portion 43A formed along the axis CL. In this embodiment, the recessed portion 43A is formed locally along the axis CL in a manner that includes the area facing the sealing members 61 and 62, but it can also be formed in a range from one end to the other end of the cylindrical body 40 along the axis CL. Figure 4A As shown, a plurality of locking portions 43 (recessed portions 43A) are formed at intervals in the circumferential direction of the inner peripheral surface 41 of the cylindrical body 40 .

[0054] In this embodiment, the projections 17 of the neck portion 15 , which is a part of the lining 11 , are filled into the recesses 43A of the locking portions 43 .

[0055] In this embodiment, the cylindrical body 40 extends from the end face of the high-pressure tank 10 to a portion of the shoulder 14b of the main body 14. The inner circumferential surface 48a of the end 48A, located on the opening 13 side, of the two end portions 48A and 48B of the cylindrical body 40 is shaped to expand radially with respect to the cylindrical body 40. The neck 15 expands radially in a manner that mimics the inner circumferential surface 48a of the end 48A. In this embodiment, the portion of the cylindrical body 40, including the end 48A located on the main body 14 side, expands radially to follow the shape of the outer circumferential surface of the shoulder 14b.

[0056] Thus, according to this embodiment, the neck portion 15 of the liner 11 can be locked to the locking portion 43 (recess 43A) of the inner circumferential surface 41 of the cylindrical body 40. This allows the metallic cylindrical body 40 to be stably restrained to the neck portion 15 of the liner 11. Consequently, a reduction in the strength of the high-pressure tank 10, which would otherwise be caused by the metallic cylindrical body 40 being unconstrained, can be prevented.

[0057] In particular, the plurality of locking portions 43 (recesses 43A) formed circumferentially on the inner circumferential surface 41 of the cylindrical body 40 lock with the neck 15, so that the cylindrical body 40 is restrained by the neck 15 of the liner 11. Therefore, the cylindrical body 40 can be prevented from rotating about its axis relative to the liner 11.

[0058] Moreover, in this embodiment, the neck 15 of the liner 11 expands in the radial direction in a manner that imitates the inner peripheral surface 48a of the end 48A of the cylindrical body 40 arranged on the opening 13 side, thereby more reliably preventing the cylindrical body 40 from falling out from the opening 13 side of the liner 11.

[0059] exist Figure 4A In the embodiment, the locking portion 43 is a plurality of groove-shaped recesses (recesses) 43A along the axis CL. However, for example, as long as the neck portion 15 of the liner 11 can be locked by the recesses 43A, the locking portion 43 may be a plurality of groove-shaped recesses formed so as to intersect the axis CL, or may be a plurality of dot-shaped recesses formed at intervals along the circumferential direction and the axis CL.

[0060] For example, Figure 4B As shown, the locking portion 43 may be a plurality of rib-like protrusions (ridges) 43B protruding along the axis CL. The neck 15 of the liner 11 covers the inner circumference 41 of the tubular body 40 including the protrusions 43B, and the outer circumference of the neck 15 is locked with the protrusions 43B.

[0061] As such, as long as the neck 15 of the lining 11 can be locked by the protrusion 43B, the locking portion 43 may be a plurality of protrusions formed so as to intersect the axis CL, or a plurality of dot-shaped protrusions formed at intervals along the circumferential direction and the axis CL.

[0062] 2. Method for manufacturing the high-pressure tank 10

[0063] 2-1. About the preparation process

[0064] Below, refer to Figures 5A to 7 The manufacturing method of the high pressure tank 10 is described. In this embodiment, first, in the preparation process, Figure 2 and Figure 5A 、 5BAs shown, a liner 11 (liner alone) is prepared, which includes a main body 14 forming a housing space S and a neck 15 continuous with the main body 14 and forming an opening 13. The neck 15 is cylindrical and has no radially expanded end.

[0065] The prepared lining 11 is made of thermoplastic resin and has the above-mentioned shape. However, at this point in time, no outer peripheral surface 15b of the neck portion 15 of the lining 11 is formed. Figure 4A The convex portion 17 is shown.

[0066] In this embodiment, the liner 11 can be produced by extrusion molding of a molten thermoplastic resin, or by preparing a thermoplastic resin cylinder having a diameter equal to that of the main body 14a of the main body 14 and molding the cylinder so that both ends are narrowed to form the shape of the neck 15. Alternatively, the liner 11 can be produced by preparing a member corresponding to the main body 14a of the main body 14 and a pair of members corresponding to the shoulder 14b and neck 15 of the main body 14 and welding them together.

[0067] Furthermore, in this preparation process, a metal cylindrical body 40 having a concave locking portion 43 (specifically, a concave portion 43A) formed on the inner peripheral surface 41 is prepared. Figure 4A As shown in FIG. 4 , a plurality of recesses 43A are formed on the inner peripheral surface 41 of the cylindrical body 40 at intervals in the circumferential direction of the inner peripheral surface 41. Figure 4B In the case of the illustrated modification, a plurality of projections 43B are formed on the inner peripheral surface 41 at intervals in the circumferential direction.

[0068] In the present embodiment, the inner circumferential surface 48a of the end portion 48A, which is located on the opening portion 13 side, of the two end portions 48A and 48B of the cylindrical body 40 is shaped to expand in the radial direction of the cylindrical body 40. On the other hand, the portion (inner circumferential surface) including the end portion 48B of the cylindrical body 40 is shaped to correspond to the shape of the outer circumferential surface of the shoulder portion 14b of the main body portion 14 of the liner 11.

[0069] 2-2. About the configuration process

[0070] In this process, if Figure 5A 、 Figure 5B As shown, the neck 15 is inserted into the metal cylindrical body 40, and the cylindrical body 40 is arranged on the neck 15. Specifically, the neck 15 is inserted into the cylindrical body 40 from the end of the liner 11, so that the portion including the end 48B of the cylindrical body 40 abuts against the shoulder 14b of the main body 14 of the liner 11.

[0071] In this state, the thermoplastic resin in the neck portion 15 does not enter the recess 43A of the cylindrical body 40, forming a gap S1. Furthermore, since the end portion of the neck portion 15 of the prepared liner 11 does not expand in the radial direction, a gap S2 is also formed between the inner circumferential surface 48a of the end portion 48 of the cylindrical body 40 and the outer circumferential surface 15b of the neck portion 15.

[0072] 2-3. Regarding the locking process (hot press forming process)

[0073] In this step, the neck portion 15 is hot-pressed from the inner circumferential surface 15a of the neck portion 15 toward the cylindrical body 40 so that the neck portion 15 follows the inner circumferential surface 41 of the cylindrical body 40, and the neck portion 15 is locked to the locking portion 43 (specifically, the recessed portion 43A). In this embodiment, the inner circumferential surface 48a of the end portion 48 disposed on the opening 13 side is shaped to expand in the radial direction of the cylindrical body 40, and in this embodiment, the neck portion 15 is hot-pressed so as to follow the inner circumferential surface 48a of the end portion 48.

[0074] Specifically, if Figure 6A 、 Figure 6B As shown, a heating roller 90 having a shape corresponding to the inner circumferential surface 41 of the cylindrical body 40 is inserted through the opening 13 of the liner 11, and the neck portion 15 of the liner 11 is thermoformed by sandwiching the liner 11 between the heating roller 90 and the cylindrical body 40. More specifically, in this embodiment, the heating roller 90, which is heated to a temperature above the softening point of the thermoplastic resin of the liner 11, is rotated about the rotation axis RL while pressing the inner circumferential surface 15a of the neck portion 15.

[0075] As a result, the neck 15 is heated and pressurized by the heating roller 90 at a temperature above the softening point of the thermoplastic resin, so that the thermoplastic resin in the neck 15 softens and deforms along the inner circumferential surface 41 of the cylindrical body 40. In this way, the thermoplastic resin of the neck 15 is filled in the recess 43A (gap S1) formed in the inner circumferential surface 15a. As a result, the neck 15 can be locked to the locking portion 43 (recess 43A) of the inner circumferential surface 41 of the neck 15. In particular, the cylindrical body 40 is constrained by the neck 15 of the liner 11 by the multiple recesses 43A formed in the circumferential direction on the inner circumferential surface 41 of the cylindrical body 40. Therefore, the cylindrical body 40 can be prevented from rotating around the axis relative to the liner 11.

[0076] At the same time, the resin at the end of the neck portion 15, which faces the inner circumferential surface 48a of the end portion 48, is also softened by the heat of the heating roller 90, and the end of the neck portion 15 is deformed to follow the inner circumferential surface 15a of the neck portion 15. Thus, the neck portion 15 of the liner 11 is hot-pressed to follow the inner circumferential surface 48a of the end portion 48 of the tubular body 40, which is disposed on the opening 13 side of the liner 11. This more reliably prevents the tubular body 40 from coming out of the opening 13 side of the liner 11.

[0077] 2-4. Reinforcement Layer Formation Step

[0078] In this process, if Figure 7 As shown, the reinforcing layer 12 is formed on the liner 11 together with the cylindrical body 40. Specifically, the reinforcing layer 12 is formed by winding a fiber bundle impregnated with a matrix resin (thermosetting resin) on the outer peripheral surface 11a of the liner 11 together with the cylindrical body 40, for example, by a filament winding method.

[0079] The reinforcing layer 12 may be formed by spiral winding with the fiber bundle tilted relative to the axis CL of the high-pressure tank 10, or may be formed by weaving with the fiber bundle tilted relative to the axis CL of the high-pressure tank 10. Before the thermosetting resin serving as the matrix resin of the reinforcing layer 12 is thermally cured, the joints 20 are attached to the necks 15 at both ends to thermally cure the thermosetting resin. Figure 3A As shown, the high-pressure tank 10 can be manufactured.

[0080] The obtained high-pressure tank 10 can stably constrain the metal cylindrical body 40 to the neck portion 15 of the liner 11 , thereby preventing a decrease in the strength of the high-pressure tank 10 caused by the metal cylindrical body 40 being in an unconstrained state.

[0081] An embodiment of the present invention has been described above in detail. However, the present invention is not limited to the above embodiment, and various design changes can be made without departing from the spirit of the present invention as described in the scope of claims.

[0082] Description of labels

[0083] 10: High-pressure tank, 11: Liner, 12: Reinforcement layer, 13: Opening, 14: Main body, 15: Neck, 30: Connecting member, 31: Insertion portion, 40: Cylindrical body, 41: Inner circumference, 43: Stopper, 43A: Concave portion, 43B: Protrusion, S: Accommodation space.

Claims

1. A method for manufacturing a high-pressure tank comprising: a liner having a receiving space for receiving a fluid and an opening formed at at least one end thereof; and a reinforcing layer covering an outer surface of the liner and made of a fiber-reinforced resin, wherein: The manufacturing method of the high-pressure tank at least comprises: a step of preparing the liner made of a thermoplastic resin, the liner having a main body portion in which the housing space is formed, and a neck portion continuous with the main body portion and in which the opening is formed; The step of inserting the neck into a metal cylindrical body having a convex or concave locking portion formed on the inner circumference thereof, and arranging the cylindrical body on the neck; a step of hot-pressing the neck portion from the inner circumferential surface of the neck portion toward the cylindrical body so that the neck portion follows the inner circumferential surface of the cylindrical body, and locking the neck portion at the locking portion; and After forming a reinforcement layer on the liner together with the cylindrical body, a ring-shaped joint is attached to the outer peripheral surface of the reinforcement layer covering the neck. The high-pressure tank is connected to the connecting portion via the joint, and the connecting portion includes: a cover portion that covers the end surface of the high-pressure tank by being screwed to the outer peripheral surface of the joint; a plug-shaped insertion portion that extends from the cover portion and is inserted from the opening along the inner peripheral surface of the neck portion; and an annular sealing member that is arranged on the outer peripheral surface of the insertion portion to seal the accommodation space. The cylindrical body is arranged at a position facing the sealing member in a state where the high-pressure tank is connected to the connecting portion. The locking portion is a plurality of convex portions or concave portions formed at intervals in the circumferential direction of the inner peripheral surface. The inner peripheral surface of the end portion arranged on the opening side of the both end portions of the cylindrical body is shaped to expand in the radial direction of the cylindrical body. In the process of locking the neck, a heating roller corresponding to the shape of the inner circumferential surface of the cylindrical body is inserted from the opening of the lining, and the neck is hot-pressed in a manner that imitates the inner circumferential surface of the end portion by sandwiching the lining with the heating roller and the cylindrical body.

2. A high-pressure tank having: A lining having a receiving space for receiving a fluid and having an opening at at least one end thereof; and a reinforcing layer covering the outer surface of the lining and being made of a fiber-reinforced resin, characterized in that: The liner is made of thermoplastic resin and has a main body portion in which the accommodation space is formed and a neck portion in which the opening is formed. The high-pressure tank further includes an annular joint mounted on the outer peripheral surface of the reinforcement layer covering the neck. A metal cylindrical body having a convex or concave locking portion formed on the inner circumference is arranged between the neck and the reinforcement layer. The high-pressure tank is connected to the connecting portion via the joint, and the connecting portion includes: a cover portion that covers the end surface of the high-pressure tank by being screwed to the outer peripheral surface of the joint; a plug-shaped insertion portion that extends from the cover portion and is inserted from the opening along the inner peripheral surface of the neck portion; and an annular sealing member that is arranged on the outer peripheral surface of the insertion portion to seal the accommodation space. The cylindrical body is arranged at a position facing the sealing member in a state where the high-pressure tank is connected to the connecting portion. The neck portion is locked in the locking portion. The locking portion is a plurality of convex portions or concave portions formed at intervals in the circumferential direction of the inner peripheral surface. The inner peripheral surface of the end portion arranged on the opening side of the both end portions of the cylindrical body is shaped to expand in the radial direction of the cylindrical body. A heating roller corresponding to the shape of the inner circumference of the cylindrical body is inserted from the opening of the liner, and the neck portion is expanded in the radial direction so as to follow the inner circumference of the end portion so as to sandwich the liner between the heating roller and the cylindrical body.

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