Pressure vessel and method for manufacturing pressure vessel

Abstract

To provide a pressure vessel capable of improving pressure resistance strength.SOLUTION: A pressure vessel 1A comprises: a liner 10; a mouthpiece portion 20X; a fiber-reinforced resin cylindrical portion 30 disposed radially outside the liner 10 and the mouthpiece portion 20X; and a reinforcing portion 40A disposed radially outside the fiber-reinforced resin cylindrical portion 30 and configured to suppress deformation of the fiber-reinforced resin cylindrical portion 30 in a radially expanding direction. An intermediate portion of the fiber-reinforced resin cylindrical portion 30 in the axial direction is exposed from the reinforcing portion 40A. The reinforcing portion 40A is disposed to cover, from a radially outer side, at least a part of a first outer diameter portion 21, a reduced-diameter portion 22 and a second outer diameter portion 23 of the mouthpiece portion 20X.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a pressure vessel for storing pressurized fluids and a method for manufacturing the pressure vessel. [Background technology]

[0002] Patent document 1 describes a tank comprising a tank body including a metal liner, a composite member wrapped around the liner, and at least one nozzle with a flange, in which the nozzle comprises a cylindrical central collar to which a retaining clamp is attached at the edge. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5948330 Summary of the Invention [Problem to be solved by the invention]

[0004] Since such tanks store high-pressure pressurized fluid, it is desirable to improve their pressure resistance. In the tank described in Patent Document 1, a retaining clamp presses the end of the composite material member from the axial direction. The pressure of the pressurized fluid stored in the liner acts in a direction that tends to expand the diameter of the end of the composite material member via an inclined surface near the end of the liner. However, since the retaining clamp cannot suppress deformation of the end of the composite material in the expanding diameter direction, the tank described in Patent Document 1 stores pressurized fluid within a pressure range that does not cause such deformation.

[0005] The present invention was created in view of the above circumstances, and an object of the present invention is to provide a pressure vessel and a method for manufacturing a pressure vessel that can improve pressure resistance strength. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the pressure vessel of the present invention is a pressure vessel for storing pressurized fluid therein, and comprises a liner having a cylindrical portion extending in an axial direction and a side wall portion provided at one end of the cylindrical portion in the axial direction, a mouth portion arranged to cover the side wall portion and for introducing and discharging the pressurized fluid into and from the liner through a hole formed in the side wall portion, a fiber reinforced resin cylindrical portion arranged radially outward of the liner and the mouth portion, and a reinforcing portion arranged radially outward of the fiber reinforced resin cylindrical portion and for suppressing deformation of the fiber reinforced resin cylindrical portion in a radial expansion direction, and The nozzle portion is exposed from the reinforcing portion and has a main body portion extending in the axial direction, a liner side end face of the main body portion that is on the liner side in the axial direction, and an opposite end face of the main body portion that is on the opposite side from the liner in the axial direction, and the main body portion has a reduced diameter portion that reduces in diameter as it moves away from the liner in the axial direction, a first outer diameter portion that is closer to the liner side end face than the reduced diameter portion, and a second outer diameter portion that is closer to the opposite end face than the reduced diameter portion and has an outer diameter smaller than the first outer diameter portion, and the reinforcing portion is arranged so as to cover at least a portion of the first outer diameter portion, the reduced diameter portion, and the second outer diameter portion from the radially outward direction.

[0007] In addition, the method for manufacturing a pressure vessel of the present invention includes a step of arranging the fiber-reinforced resin tubular portion radially outside the tubular portion and the nozzle portion, and a step of arranging the reinforcing portion radially outside the fiber-reinforced resin tubular portion. [Effects of the Invention]

[0008] According to the present invention, the pressure resistance strength of a pressure vessel can be improved. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a cross-sectional view schematically showing a pressure vessel according to a first embodiment of the present invention. [Figure 2] 1 is a cross-sectional view schematically showing a pressure vessel according to a first embodiment of the present invention, and is a partially enlarged view of FIG. [Figure 3] 1 is a flowchart illustrating a method for manufacturing a pressure vessel according to a first embodiment of the present invention. [Figure 4] FIG. 2 is a schematic diagram for explaining a method for manufacturing a pressure vessel according to a first embodiment of the present invention, and is a cross-sectional view schematically showing a liner and an end member. [Figure 5] FIG. 1 is a schematic diagram for explaining a method for manufacturing a pressure vessel according to a first embodiment of the present invention, and is a cross-sectional view schematically showing a state in which a first carbon fiber layer is disposed. [Figure 6] FIG. 2 is a schematic diagram for explaining the method for manufacturing a fiber-reinforced resin cylindrical body according to the first embodiment of the present invention, and is a cross-sectional view showing the state in which a second carbon fiber layer is arranged. [Figure 7] FIG. 2 is a schematic diagram for explaining a method for manufacturing a fiber-reinforced resin cylindrical body according to the first embodiment of the present invention, and is a cross-sectional view showing a state in which a reinforcing portion is arranged. [Figure 8] FIG. 2 is a schematic diagram for explaining a method for manufacturing a pressure vessel according to a first embodiment of the present invention, and is a diagram showing a method for forming a carbon fiber layer using a multiple yarn filament winding device. [Figure 9] FIG. 2 is a schematic diagram for explaining a method for manufacturing a pressure vessel according to a first embodiment of the present invention, and is a diagram showing a method for forming a carbon fiber layer using a bobbin of a multiple yarn filament winding device. [Figure 10] FIG. 1 is a schematic diagram for explaining a method for manufacturing a pressure vessel according to a first embodiment of the present invention, and is a cross-sectional view showing a state in which an assembly in which a carbon fiber layer and a reinforcing portion are arranged is placed in a molding device. [Figure 11] FIG. 4 is a cross-sectional view schematically showing a pressure vessel according to a second embodiment of the present invention. [Figure 12] 10 is a flowchart illustrating a method for manufacturing a pressure vessel according to a second embodiment of the present invention. [Figure 13] FIG. 10 is a schematic diagram for explaining a method for manufacturing a pressure vessel according to a second embodiment of the present invention, and is a diagram schematically showing a method for forming a carbon fiber layer using a multiple yarn filament winding device. [Figure 14] FIG. 10 is a cross-sectional view schematically showing a pressure vessel according to a third embodiment of the present invention. [Figure 15] 10 is a flowchart illustrating a method for manufacturing a pressure vessel according to a third embodiment of the present invention. [Figure 16] FIG. 10 is a schematic diagram for explaining a method for manufacturing a pressure vessel according to a third embodiment of the present invention, and is a cross-sectional view showing a state in which a fixing member is arranged. [Figure 17] FIG. 10 is a schematic diagram for explaining a method for manufacturing a pressure vessel according to a third embodiment of the present invention, and is a cross-sectional view showing a state in which the resin has been impregnated and hardened. [Figure 18] FIG. 10 is a cross-sectional view schematically showing a pressure vessel according to a fourth embodiment of the present invention. [Figure 19] 10 is a flowchart illustrating a method for manufacturing a pressure vessel according to a fourth embodiment of the present invention. [Figure 20] FIG. 10 is a schematic diagram for explaining a method for manufacturing a pressure vessel according to a fourth embodiment of the present invention, and is a diagram schematically showing a method for forming a carbon fiber layer using a filament winding device. [Figure 21] FIG. 10 is a schematic diagram for explaining a method for manufacturing a pressure vessel according to a fourth embodiment of the present invention, and is a diagram schematically showing a method for forming a carbon fiber layer using a filament winding device. DETAILED DESCRIPTION OF THE INVENTION

[0010]

[0023] An embodiment of the present invention will be described in detail with reference to the drawings. In the following description, the same elements are designated by the same reference numerals, and duplicated explanations will be omitted. The drawings are exaggerated for clarity.

[0011] First Embodiment As shown in FIGS. 1 and 2, a pressure vessel 1A according to a first embodiment of the present invention is a cylindrical body for storing a pressurized fluid therein. Examples of pressurized fluids include pressurized hydrogen and natural gas. The pressure vessel 1A includes a liner 10, a pair of end members 20 (20X, 20Y), a fiber-reinforced resin cylindrical portion 30, and a pair of reinforcing portions 40A. Of the pair of end members 20, the one located at one end (first end 12X) of the liner 10 in the axial direction is referred to as end member 20X. Furthermore, of the pair of end members 20, the one located at the other end (second end 12Y) of the liner 10 in the axial direction is referred to as end member 20Y.

[0012] <liner> The liner 10 is a resin member having a tubular shape (in this embodiment, a substantially cylindrical shape) with both axial ends open. The liner 10 integrally includes a tubular portion 11 and end portions 12 (12X, 12Y).

[0013] ≪Cylinder part≫ The cylindrical portion 11 extends in the axial direction and is a main portion in which pressurized fluid is stored. In this embodiment, the cylindrical portion 11 has a cylindrical shape with the axis of the liner 10 as its center.

[0014] <End> The end portion 12 is a portion that constitutes the end portion in the axial direction of the cylindrical portion 11. In this embodiment, the end portion 12 includes a small diameter portion (hole portion) 12a that extends in the axial direction from the cylindrical portion 11, and an end face portion (side wall portion) 12b that constitutes the boundary between the cylindrical portion 11 and the small diameter portion 12a.

[0015] <End parts> The end member 20 is a metal member (or a resin member) having a generally cylindrical or columnar shape that is arranged to cover the end 12 of the liner 10 from the radially outer side and the axially outer side, thereby constituting the axial end of the pressure vessel 1A. The end member 20 is arranged coaxially with the liner 10. The end member 20 integrally comprises, in axial order from the liner 10 side, a first outer diameter portion 21, a reduced diameter portion 22, a second outer diameter portion 23, and a third outer diameter portion 24. In this embodiment, the first outer diameter portion 21, the second outer diameter portion 23, and the third outer diameter portion 24 have a cylindrical or columnar shape centered on the axis of the liner 10.

[0016] ≪First outer diameter portion≫ The first outer diameter portion 21 is a portion that constitutes the axial base end portion of the end member 20 and is arranged so as to be continuous with the cylindrical portion 11 of the liner 10 , and has the same outer diameter as the cylindrical portion 11 of the liner 10 .

[0017] ≪Reduced diameter part≫ The reduced diameter portion 22 is a portion whose outer diameter decreases (reduced in diameter) as it moves away from the liner 10 in the axial direction (from the first outer diameter portion 21 toward the second outer diameter portion 23). In this embodiment, the reduced diameter portion 22 is a tapered portion whose outer diameter linearly decreases from the first outer diameter portion 21 toward the second outer diameter portion 23. The inclination angle θ0 (with respect to the axial direction of the tubular portion 11) of the outer peripheral surface of the tapered reduced diameter portion 22 is 30° to 60° (see FIG. 4).

[0018] ≪Second outer diameter portion≫ The second outer diameter portion 23 has an outer diameter smaller than that of the first outer diameter portion 21. A recess 23a is formed on the outer peripheral surface of the second outer diameter portion 23. The recess 23a is a portion in which carbon fiber layers 31 and 32, which will be described later, are accommodated, and in this embodiment, is an annular groove. That is, the width (axial dimension) of the recess 23a is larger than the width direction dimension (outer diameter) of a single carbon fiber aggregate in the carbon fiber layers 31 and 32, which will be described later. Furthermore, in this embodiment, a portion of the first carbon fiber layer 31 is accommodated in the recess 23a, and the other portion of the first carbon fiber layer 31 and the second carbon fiber layer 32 are located radially outward of the space of the recess 23a.

[0019] Furthermore, it is preferable that the pair of side surfaces 23a1 of the recess 23a have a tapered shape that separates (widens) from the bottom surface 23a2 of the recess 23a toward the opening. Various dimensions of the recess 23a (depth of the recess 23a, angle of the side surface 23a1 relative to the bottom surface 23a2, axial dimensions of the side surface 23a1 and the bottom surface 23a2, distance from the reduced diameter portion 22, etc.) can be set appropriately depending on the outer diameter of the portion where the recess 23a is formed, the outer diameters of the carbon fiber layers 31 and 32, etc.

[0020] ≪Third outer diameter portion≫ The third outer diameter portion 24 is a portion that constitutes the axial tip of the end member 20 and has an outer diameter smaller than that of the second outer diameter portion 23 .

[0021] The axial dimension L1 of the first outer diameter portion is larger than the axial dimension L2 of the reduced diameter portion 22 and is smaller than the axial dimension L3 of the second outer diameter portion . L2 <L1<L3

[0022] ≪End surface≫ The end member 20 has a liner-side end face 20a and an opposite end face 20b as surfaces that intersect (are perpendicular to) the axial direction. The liner-side end face 20a is the end face of the first outer diameter portion 21 and abuts against the end face portion 12b of the liner 10. The opposite end face 20b is an end face formed at the boundary between the second outer diameter portion 23 and the third outer diameter portion 24.

[0023] <Flow path> A flow path portion 20c is formed in the end member 20X serving as a nozzle portion. The flow path portion 20c axially penetrates the end member 20X and communicates with the internal space of the small diameter portion 12a of the liner 10. The flow path portion 20c is a portion through which external pressurized fluid flows into the liner 10 and is stored therein, and through which pressurized fluid stored in the liner 10 flows out to the outside. A valve member (not shown) or the like is attached to an opening of the flow path portion 20c on the opposite side from the liner 10.

[0024] <Cylinder made of fiber-reinforced resin> The fiber-reinforced resin tubular portion 30 is a fiber-reinforced resin layer (fiber-containing resin layer) formed in a cylindrical shape so as to fit along the outer peripheral surfaces of the liner 10 and the end member 20 (the first outer diameter portion 21, the reduced diameter portion 22, and the second outer diameter portion 23). In this embodiment, the fiber-reinforced resin tubular portion 30 has a cylindrical shape centered on the axis of the liner 10.

[0025] The outer diameter of the fiber-reinforced resin tubular portion 30 is approximately constant along the axial direction. That is, the thickness of the fiber-reinforced resin tubular portion 30 at a portion radially outside the second outer diameter portion 23 is greater than the thickness of a portion radially outside the first outer diameter portion 21. The axial dimension L1 of the fiber-reinforced resin tubular portion 30 at a portion radially outside the first outer diameter portion 21 is greater than the axial dimension L2 of the portion radially outside the reduced diameter portion 22 and is smaller than the axial dimension L3 of the portion radially outside the second outer diameter portion 23. L2 <L1<L3

[0026] 2, the fiber-reinforced resin tubular portion 30 includes, as carbon fiber layers, a first carbon fiber layer 31 and a second carbon fiber layer 32, in that order from the radially inner side (the liner 10 and end member 20 side). The orientation angle of the first carbon fiber layer 31 and the orientation angle of the second carbon fiber layer 32 are different from each other. The opposite end face 20b of the end member 20 and the outer peripheral surface of the third outer diameter portion 24 are not covered by the fiber-reinforced resin tubular portion 30, and are exposed from the fiber-reinforced resin tubular portion 30.

[0027] <First carbon fiber layer (helical layer)> The first carbon fiber layer 31 is composed of a plurality of carbon fibers provided on the outer peripheral surface of the liner 10 or the like so as to cover the liner 10. More specifically, a carbon fiber aggregate is formed by gathering a plurality of carbon fibers into a strip or bundle shape, and the first carbon fiber layer 31 is formed by providing a plurality of carbon fiber aggregates with different phases. The carbon fibers in the first carbon fiber layer 31 are wound one or more times so as to be inclined at 45° (or −45°) with respect to the axial direction of the liner 10, and extend in a spiral with respect to the axial direction of the liner 10. That is, the orientation angle θ1 of the carbon fibers in the first carbon fiber layer 31 with respect to the axis of the liner 10 is 45° (or −45°) (see FIG. 5 ).

[0028] <Second carbon fiber layer (hoop layer)> The second carbon fiber layer 32 is provided radially outside the first carbon fiber layer 31 and is composed of a plurality of carbon fibers provided so as to cover the first carbon fiber layer 31. More specifically, a carbon fiber aggregate is formed by gathering a plurality of carbon fibers into a strip or bundle shape, and the second carbon fiber layer 32 is formed by arranging the plurality of carbon fiber aggregates in different phases. The carbon fibers in the second carbon fiber layer 32 extend substantially perpendicular to the axial direction of the liner 10. That is, with respect to the second carbon fiber layer 32, the orientation angle θ2 of the carbon fibers with respect to the axis of the liner 10 is substantially 90° (e.g., 89° or 91°) (see FIG. 6).

[0029] <Reinforcement part> The reinforcing portion 40A is a metal member having a tubular shape (a cylindrical shape in this embodiment) that is arranged so as to cover the axial end portion of the fiber-reinforced resin tubular portion 30 from the radial outside, thereby reinforcing the axial end portion of the fiber-reinforced resin tubular portion 30 so as to suppress deformation in the radial direction of the axial end portion. The reinforcing portion 40A may be made of steel or may be made of a metal other than an iron-based metal.

[0030] The reinforcing portion 40A is arranged to cover at least a portion of the first outer diameter portion 21, the reduced diameter portion 22, and the second outer diameter portion 23 from the radially outer side. The reinforcing portion 40A is desirably arranged to cover the boundary portion between the first outer diameter portion 21 and the reduced diameter portion 22 from the radially outer side. In other words, the reinforcing portion 40A is desirably arranged to cover the first outer diameter portion 21 and the reduced diameter portion 22 from the radially outer side across the boundary portion between the first outer diameter portion 21 and the reduced diameter portion 22. In the present embodiment, one axial end portion of the reinforcing portion 40A is located radially outward from the first outer diameter portion 21, and the other axial end portion of the reinforcing portion 40A is located radially outward from the tip portion of the second outer diameter portion 23.

[0031] In addition, the other axial end of the reinforcing portion 40A may be located at a position perpendicular to the tip end of the reduced diameter portion 22, or may be located at a position through which the tip end of the reduced diameter portion 22 passes when rotated around the base end of the reduced diameter portion 22.

[0032] <Effect of reinforcement> When the liner 10 is filled with pressurized fluid, the pressure of the pressurized fluid inside the liner 10 acts to press the end member 20 in the axial direction (force F1). A component force F2 of this force F1 acts at the reduced diameter portion 22 to press the fiber-reinforced resin tubular portion 30 in an oblique direction (a direction perpendicular to the reduced diameter portion 22). This component force F2 acts in a direction that attempts to expand the diameter of the fiber-reinforced resin tubular portion 30 with the boundary portion as a fulcrum (rotational moment M1). The reinforcing portion 40A generates a resistance force (rotational moment M2) against this rotational moment M1, thereby preventing the fiber-reinforced resin tubular portion 30 from breaking and improving the pressure resistance of the pressure vessel 1A.

[0033] The reinforcing portions 40A are disposed at both axial ends of the fiber-reinforced resin tubular portion 30. That is, the outer peripheral surface of the axial middle portion of the fiber-reinforced resin tubular portion 30 (the portion corresponding to the radially outer side of the tubular portion 11 of the liner 10) is exposed from the reinforcing portions 40A. That is, by disposing the reinforcing portions 40A only in necessary portions, the pressure vessel 1A can improve its pressure resistance while suppressing increases in costs.

[0034] <Manufacturing method> Next, a method for manufacturing a pressure vessel 1A according to a first embodiment of the present invention will be described with reference to the flowchart of FIG. 3. The method for manufacturing the pressure vessel 1A includes a liner forming step (step S1) and an end member connecting step (step S2) performed after the liner forming step. The method for manufacturing the pressure vessel 1A also includes a fiber providing step (steps S3X, S3Y) performed after the end member connecting step and a reinforcing portion arranging step (step S4A) performed after the fiber providing step. The method for manufacturing the pressure vessel 1A also includes a mold setting step (step S5) performed after the reinforcing portion arranging step and a molding step (step S6) performed after the mold setting step. The method for manufacturing the pressure vessel 1A also includes a removal step (step S7) performed after the molding step. Here, the fiber providing step, mold setting step, molding step, and removal step constitute a step of arranging a fiber-reinforced resin tubular portion 30 radially outward of the liner 10 and the nozzle portion 20X (fiber-reinforced resin tubular portion arranging step).

[0035] Step S1 is a process of forming the resin liner 10 shown in FIG. 1 using a molding device (not shown).

[0036] Following step S1, in step S2, the liner 10 and the pair of end members 20 are connected to each other as shown in FIG.

[0037] Following step S2, in step S3X, a first carbon fiber layer 31 is formed on the outer peripheral surfaces of the tubular portion 11 of the liner 10, and the first outer diameter portion 21, the reduced diameter portion 22, and the second outer diameter portion 23 of the end member 20, as shown in Fig. 5. Following step S3X, in step S3Y, a first carbon fiber layer 31 is formed on the outer peripheral surfaces of the tubular portion 11 of the liner 10, and the first outer diameter portion 21, the reduced diameter portion 22, and the second outer diameter portion 23 of the end member 20, as shown in Fig. 6.

[0038] In steps S3X and S3Y, the carbon fiber layers 31 and 32 are not resin-impregnated fibers but are so-called raw silk. The carbon fiber layers 31 and 32 are simultaneously arranged on the outer peripheral surfaces of the liner 10 and the end member 20 by a multiple filament winding (MFW) method. The carbon fiber layers 31 and 32 fed by the multiple filament winding method are independent layers without being woven together, and have a so-called non-crimp structure.

[0039] In steps S3X and S3Y, the carbon fiber layers 31 and 32 are arranged on the outer peripheral surfaces of the liner 10 and the end member 20 from one direction (only) by the multiple feed filament winding device 100A (100X, 100Y) shown in FIG. 7. Specifically, the carbon fiber layers 31 and 32 are arranged from one direction only, starting from the end member 20X side, which is one end in the axial direction, and winding proceeds from the end member 20X side toward the end member 20Y side, which is the other end in the axial direction. The multiple feed filament winding device 100A (100X, 100Y) can appropriately set and change the orientation angle of the carbon fiber layers 31 and 32. The assembly of the liner 10 and the end member 20 passes through the multiple feed filament winding device 100X, 100Y, starting from one end (end member 20X) side. The upstream multi-yarn filament winding device 100X winds a first carbon fiber layer 31 onto the assembly, and the downstream multi-yarn filament winding device 100Y winds a second carbon fiber layer 32 onto the assembly.

[0040] As shown in Fig. 8, the multiple supply filament winding device 100A includes a plurality of bobbins 101 arranged to surround a moving assembly from the radial outside. The multiple supply filament winding device 100A forms carbon fiber layers 31, 32 by unwinding a fiber bundle 110 from the bobbins 101 and winding it around the assembly. Both ends of the fiber bundle 110 that form the carbon fiber layers 31, 32 are appropriately cut. Note that the carbon fiber layers 31, 32 may be configured to be arranged by the device to form an integral cylindrical shape, and then be placed on the outer peripheral surfaces of the liner 10 and end member 20.

[0041] Here, the reduced diameter portion 22 as a linear tapered portion can suppress slippage of the carbon fiber layers 31, 32 compared to a bulging dome shape (so-called geodesic). In this embodiment, the inclination angle θ0 (see FIG. 4 ) of the outer circumferential surface of the reduced diameter portion 22 (with respect to the axial direction of the tubular portion 11) is 30° to 60°. If the inclination angle θ0 is less than 30°, the axial dimension of the reduced diameter portion 22 becomes large. If the inclination angle θ0 is greater than 60°, slippage may occur in the carbon fiber layers 31, 32 wound around the reduced diameter portion 22. That is, the reduced diameter portion 22 with the inclination angle θ0 set to 30° to 60° can suitably suppress slippage of the carbon fiber layers 31, 32 while suppressing an increase in the axial dimension.

[0042] A longitudinal portion of each of the carbon fiber layers 31, 32 is wound radially outward of the recess 23a at a location where the recess 23a is formed, thereby positioning the end member 20 at the recess 23a. More specifically, the first carbon fiber layer 31 is positioned relative to the end member 20 by being wound so that a portion of the first carbon fiber layer 31 is accommodated in the recess 23a. The second carbon fiber layer 32 is wound so that it is accommodated in a recess 31a formed in the outer peripheral surface of the first carbon fiber layer 31 in correspondence with the recess 23a, thereby being positioned relative to the end member 20 via the first carbon fiber layer 31. With this configuration, even if deformation occurs in the reduced diameter portion 22 of the end member 20, it is possible to prevent the end member 20 from shifting in position within the internal space of the carbon fiber layers 31, 32.

[0043] Following step S3Y, in step S4A, as shown in Fig. 9, reinforcing portions 40A are disposed radially outward from the ends of the carbon fiber layers 31, 32, thereby reinforcing the ends of the carbon fiber layers 31, 32. The reinforcing portions 40A are fitted onto the outer peripheral surfaces of the carbon fiber layers 31, 32. An adhesive layer (not shown) may be disposed between the outer peripheral surface of the carbon fiber layer 32 and the inner peripheral surface of the reinforcing portion 40A to secure them to each other.

[0044] Following step S4A, in step S5, as shown in FIG. 10, an assembly of the liner 10, the end member 20, the reinforcing portion 40A, and the carbon fiber layers 31 and 32 is placed in a molding device 200 (mold).

[0045] Following step S5, in step S6, as shown in FIG. 10, resin 33 is supplied into the molding apparatus 200. This allows the carbon fiber layers 31, 32 arranged on the outer peripheral surfaces of the liner 10 and the end member 20 to be impregnated with the resin 33. Furthermore, the molding apparatus 200 is heated to harden the resin 33, and the fiber-reinforced resin tubular portion 30 is formed by a so-called RTM (Resin Transfer Molding) method, and the liner 10, end member 20, reinforcing portion 40A, and fiber-reinforced resin tubular portion 30 are integrally molded. The resin 33 is, for example, a thermosetting resin. In this embodiment, the mold of the molding apparatus 200 is divided into multiple parts. In step S6, heat is applied to the assembly, and a mold closing operation is performed to close the mold of the molding apparatus 200. Subsequently, a mold clamping operation is performed to apply pressure to the closed mold, thereby increasing the pressure inside the mold and promoting the hardening of the resin 33. In this embodiment, the mold is divided into multiple sections, and therefore mold closing and clamping operations are performed. However, these operations are not required. Furthermore, if the mold is not divided into multiple sections, these operations are not required. A space (resin pool) may be formed on the outlet side of the gate 201 through which the molten resin 33 is introduced within the molding apparatus 200. The resin 33 introduced into the molding apparatus 200 is stored in the resin pool located to the side of the first ends of the carbon fiber layers 31 and 32. The resin 33 stored in the resin pool moves in the axial direction of the liner 10 by vacuum suction from a suction port 202 formed on the opposite side of the gate 201 in the arrangement direction of the carbon fiber layers 31 and 32, and impregnates the carbon fiber layers 31 and 32. With the carbon fiber layers 31 and 32 impregnated with the resin 33, heat is applied to the molding device 200, and pressure is further applied to the inside of the molding device 200, thereby forming the fiber-reinforced resin tubular portion 30. The outer peripheral surface of the reinforcing portion 40A and the end face on the liner 10 side are covered with a layer of hardened resin 33.

[0046] Following step S6, in step S7, the molded assembly, i.e., pressure vessel 1A, is removed from molding apparatus 200 as shown in FIG.

[0047] A pressure vessel 1A according to a first embodiment of the present invention is a pressure vessel 1A for storing a pressurized fluid therein, and comprises a liner 10 having a cylindrical portion 11 extending in an axial direction and a side wall portion (end surface portion 12a) provided at one end of the cylindrical portion 11 in the axial direction, a nozzle portion 20X arranged to cover the side wall portion and for introducing and discharging the pressurized fluid into and from the liner 10 through a hole portion (small diameter portion 12a) formed in the side wall portion, a fiber reinforced resin cylindrical portion 30 arranged radially outward of the liner 10 and the nozzle portion 20X, and a reinforcing portion 40A arranged radially outward of the fiber reinforced resin cylindrical portion 30 and for suppressing deformation of the fiber reinforced resin cylindrical portion 30 in a radially expanding direction, and The nozzle portion 20X is exposed from the reinforcing portion 40A and has a main body portion extending in the axial direction, a liner side end face 20a that is on the liner 10 side of the main body portion in the axial direction, and an opposite side end face 20b that is on the opposite side of the liner 10 in the axial direction of the main body portion, and the main body portion has a reduced diameter portion 22 that reduces in diameter as it moves away from the liner 10 in the axial direction, a first outer diameter portion 21 that is on the liner side end face 20a side of the reduced diameter portion 22, and a second outer diameter portion 23 that is on the opposite side end face 20b side of the reduced diameter portion 22 and has an outer diameter smaller than that of the first outer diameter portion 21, and the reinforcing portion 40A is arranged so as to cover at least a portion of the first outer diameter portion 21, the reduced diameter portion 22 and the second outer diameter portion 23 from the radially outward side. Therefore, the pressure vessel 1A can suppress deformation of the end of the fiber reinforced resin tubular portion 30 in the direction of expanding its diameter due to the pressure of the pressurized fluid stored inside, thereby improving the pressure resistance strength.

[0048] In the pressure vessel 1A, the reinforcing portion 40A is arranged so as to cover the boundary portion between the first outer diameter portion 21 and the reduced diameter portion 22 from the radially outer side. Therefore, the pressure vessel 1A can effectively suppress deformation of the end of the fiber-reinforced resin tubular portion 30 in the radial expansion direction by reinforcing the base of the fiber-reinforced resin tubular portion 30 in the radial expansion direction.

[0049] In the pressure vessel 1A, the reinforcing portion 40A is disposed from the boundary between the first outer diameter portion 21 and the reduced diameter portion 22 to the end of the second outer diameter portion 22 on the opposite end face 20b side. Therefore, by reinforcing the entire portion of the fiber-reinforced resin tubular portion 30 that deforms in the radial direction, the pressure vessel 1A can more effectively suppress deformation of the end portion of the fiber-reinforced resin tubular portion 30 in the radial direction.

[0050] In the pressure vessel 1A, the dimension L1 of the first outer diameter portion 21 in the axial direction of the nozzle portion 20X is larger than the dimension L2 of the reduced diameter portion 22 in the axial direction of the nozzle portion 20X, and is smaller than the dimension L3 of the second outer diameter portion 23 in the axial direction of the nozzle portion 20X. Therefore, in the pressure vessel 1A, the fiber reinforced resin cylindrical portion 30 arranged radially outside the second outer diameter portion 23 can suitably prevent the mouthpiece portion 20X from coming off in the axial direction.

[0051] In the pressure vessel 1A, the first outer diameter portion 21 and the second outer diameter portion 23 have a cylindrical shape, and the reduced diameter portion 22 is a tapered portion. Therefore, in the pressure vessel 1A, slippage of the fibers can be suppressed during and after the manufacturing process, compared to when the reduced diameter section 22 has a curved shape (dome shape).

[0052] In the pressure vessel 1A, the reinforcing portion 40A is formed of metal. Here, the reinforcing portion may be formed of steel or a metal other than iron-based. Therefore, by realizing a high-strength reinforcing portion 40A, the pressure vessel 1A can suitably suppress deformation of the end of the fiber-reinforced resin tubular portion 30 in the radial direction. As a material for the reinforcing portion 40A, an iron-based material (e.g., steel) is inexpensive and has excellent processability. Furthermore, aluminum is lighter and more corrosion-resistant than iron-based materials. Furthermore, titanium is lighter and stronger than iron-based materials. Furthermore, tungsten has higher strength than iron-based materials. Furthermore, magnesium is lighter than iron-based materials.

[0053] In the pressure vessel 1A, the reinforcing portion 40A is fitted onto the fibers (carbon fiber layers 31, 32) that make up the fiber-reinforced resin tubular portion 30, and the resin 33 that makes up the fiber-reinforced resin tubular portion 30 is impregnated into the fibers that make up the fiber-reinforced resin tubular portion 30 onto which the reinforcing portion 40A is fitted and hardens, covering the outer surface of the reinforcing portion 40A. Therefore, in the pressure vessel 1A, the resin 33 can provide protection for the surface of the reinforcing portion 40A.

[0054] In the fiber reinforced resin cylindrical portion 30 of the pressure vessel 1A, the thickness of the second outer diameter portion 23 on the radially outer side is greater than the thickness of the first outer diameter portion 21 on the radially outer side. Therefore, in the pressure vessel 1A, the fiber reinforced resin cylindrical portion 30 arranged radially outside the second outer diameter portion 23 can suitably prevent the mouthpiece portion 20X from coming off in the axial direction.

[0055] Furthermore, the manufacturing method of the pressure vessel 1A according to the first embodiment of the present invention includes the steps of connecting the liner 10 and the nozzle portion 20X to each other, arranging the fiber reinforced resin cylindrical portion 30 radially outside the cylindrical portion 11 and the nozzle portion 20X, and arranging the reinforcing portion 40A radially outside the fiber reinforced resin cylindrical portion 30. Therefore, according to the manufacturing method of the pressure vessel 1A, it is possible to suppress deformation of the end of the fiber-reinforced resin tubular portion 30 in the radial direction due to the pressure of the pressurized fluid stored inside, and ultimately to manufacture a pressure vessel 1A with higher pressure resistance strength.

[0056] The method for manufacturing the pressure vessel 1A includes the steps of connecting the liner 10 and the nozzle portion 20X to each other, arranging fibers (carbon fiber layers 31, 32) radially outside the tubular portion 11 and the nozzle portion 20X, arranging the reinforcing portion 40A radially outside the fibers, and impregnating the fibers with resin 33 and hardening the resin, and in the step of impregnating the fibers with resin 33 and hardening the resin, a portion of the resin 33 hardens while covering the outer peripheral surface of the reinforcing portion 40A. Therefore, according to the manufacturing method of the pressure vessel 1A, it is possible to manufacture a pressure vessel 1A in which the surface of the reinforcing portion 40A is protected by the resin 33.

[0057] Second Embodiment Next, a pressure vessel according to a second embodiment of the present invention will be described, focusing on the differences from the pressure vessel 1A according to the first embodiment. As shown in Fig. 11, the pressure vessel 1B according to the second embodiment of the present invention has a pair of reinforcing portions 40B instead of the pair of reinforcing portions 40A.

[0058] <Reinforcement part> The reinforcing portion 40B is made of a composite material. In this embodiment, the reinforcing portion 40B is a fiber-reinforced resin layer (fiber-containing resin layer) formed in a cylindrical shape so as to fit along the outer circumferential surface of the fiber-reinforced resin tubular portion 30. The reinforcing portion 40B includes a carbon fiber layer 41 and a resin 33 that is impregnated into the carbon fiber layer 41 and hardens.

[0059] <Carbon fiber layer (hoop layer)> The carbon fiber layer 41 is provided radially outside the second carbon fiber layer 32 and is composed of a plurality of carbon fibers provided so as to cover the second carbon fiber layer 32. More specifically, a plurality of carbon fibers are gathered into a strip or bundle shape to form a carbon fiber aggregate, and the carbon fiber layer 41 is formed by providing the plurality of carbon fiber aggregates with different phases. The carbon fibers in the carbon fiber layer 41 extend approximately perpendicular to the axial direction of the liner 10. That is, with respect to the carbon fiber layer 41, the inclination angle θ3 of the carbon fibers with respect to the axis of the liner 10 is 80° to 90° (or 90° to 100°).

[0060] <Manufacturing method> Next, a method for manufacturing a pressure vessel 1B according to a second embodiment of the present invention will be described with reference to the flowchart of Fig. 12. The method for manufacturing the pressure vessel 1B includes a reinforcing portion arranging step (step S4B) and a fixing member arranging step (step S4C) instead of the reinforcing portion arranging step (step S4A).

[0061] Step S4B is a fiber setting process for setting the carbon fiber layer 41 that constitutes part of the reinforcing portion 40B. In step S4B, the carbon fiber layer 41 is formed on the outer peripheral surfaces of the second carbon fiber layer 32 in the first outer diameter portion 21, the reduced diameter portion 22, and the second outer diameter portion 23 of the end member 20 (see FIG. 9).

[0062] In step S4B, the carbon fiber layer 41 is not a resin-impregnated fiber but is so-called raw silk. The carbon fiber layer 41 is disposed simultaneously with the carbon fiber layers 31 and 32 on the outer peripheral surfaces of the liner 10 and the end member 20 by a multiple filament winding (MFW) method. The carbon fiber layers 31, 32, and 41 fed by the multiple filament winding method are independent layers without being woven together, and exhibit a so-called non-crimp structure.

[0063] In steps S3X, S3Y, and S4B, the carbon fiber layers 31 and 32 are arranged on the outer peripheral surfaces of the liner 10 and the end member 20 from one direction (only) by a multi-supply filament winding device 100B (100X, 100Y, 100Z) shown in FIG. 13. Specifically, the carbon fiber layers 31 and 32 are arranged from one direction only, starting from the end member 20X side, which is one end in the axial direction, and winding proceeds from the end member 20X side toward the end member 20Y side, which is the other end in the axial direction. The multi-supply filament winding device 100B (100X, 100Y, 100Z) can appropriately set and change the orientation angles of the carbon fiber layers 31, 32, and 41. The assembly of the liner 10 and the end member 20 passes through the multi-supply filament winding device 100X, 100Y, and 100Z, starting from one end (end member 20X). The upstream multi-yarn filament winding device 100X winds a first carbon fiber layer 31 onto the assembly, the midstream multi-yarn filament winding device 100Y winds a second carbon fiber layer 32 onto the assembly, and the downstream multi-yarn filament winding device 100Z winds a carbon fiber layer 41 onto the assembly.

[0064] 11, in step S4C, a fixing member 50 is disposed radially outside the carbon fiber layer 41, thereby fixing the carbon fiber layer 41 to the end member 20. The fixing member 50 is, for example, a metal tape or the like, and is wound around the outer peripheral surface of the carbon fiber layer 41. The fixing member 50 may be configured to melt by the heat in step S6.

[0065] In step S5, the assembly of the liner 10, end member 20, carbon fiber layers 31, 32, 41, and fixing member 50 is placed in a molding apparatus 200 (see FIG. 10). In step S6, the resin 33 is impregnated into the carbon fiber layers 31, 32, 41 arranged on the outer peripheral surfaces of the liner 10 and end member 20, and is cured.

[0066] In the pressure vessel 1B according to the second embodiment of the present invention, the reinforcing portion 40B is made of a composite material. Here, the reinforcing portion 40B may be made of a fiber-reinforced resin. Therefore, by realizing a high-strength reinforcing portion 40B, the pressure vessel 1B can effectively suppress deformation of the end of the fiber-reinforced resin tubular portion 30 in the radial direction. As a material for the reinforcing portion 40B, a composite material is lighter than metal. Furthermore, fiber-reinforced resin, which is an example of a composite material, is lighter than metal and can achieve a desired strength in a desired direction by setting the fiber direction. In other words, the pressure vessel 1B, which includes a reinforcing portion 40B formed from fiber-reinforced resin, can achieve the required strength with the minimum necessary material, thereby achieving weight reduction and high strength per unit volume.

[0067] In the pressure vessel 1B, the fibers (carbon fiber layer 41) that make up the fiber reinforced resin are wound around the nozzle portion 20X at an angle of 80 degrees to 100 degrees with respect to the axis of the nozzle portion 20X. Therefore, the pressure vessel 1B can suitably suppress deformation of the end of the fiber reinforced resin tubular portion 30 in the radial expansion direction by realizing the reinforcing portion 40B having high strength against forces in the radial expansion direction.

[0068] In the pressure vessel 1B, the fibers constituting the fiber reinforced resin are wound using a filament winding method or a multiple yarn filament winding method. Therefore, in the pressure vessel 1B, the reinforcing portion 40B can be formed by arranging fibers efficiently and at low cost.

[0069] <Third embodiment> Next, a pressure vessel according to a third embodiment of the present invention will be described, focusing on the differences from the pressure vessel 1A according to the first embodiment. As shown in Fig. 14, in the pressure vessel 1C according to the third embodiment of the present invention, a pair of reinforcing portions 40A are exposed from the resin 33.

[0070] <Manufacturing method> Next, a method for manufacturing a pressure vessel 1C according to a third embodiment of the present invention will be described with reference to the flowchart of Fig. 15. The method for manufacturing the pressure vessel 1C includes a fixing member arranging step S4C instead of the reinforcing portion arranging step (step S4A), and a reinforcing portion arranging step (step S8C) that is performed after the removal step (step S7).

[0071] 16, fixing members 50 are disposed radially outside the ends of the carbon fiber layers 31, 32, thereby fixing the ends of the carbon fiber layers 31, 32 to the end members 20. The fixing members 50 are, for example, metal tapes, and are wound around the outer circumferential surfaces of the carbon fiber layers 31, 32. The fixing members 50 may be configured to melt when heated in step S6.

[0072] Following step S7, in step S8C, the reinforcing portion 40A is disposed radially outside the end of the fiber-reinforced resin tubular portion 30, thereby reinforcing the end of the fiber-reinforced resin tubular portion 30. The reinforcing portion 40A is fitted onto the outer peripheral surface of the fiber-reinforced resin tubular portion 30. Here, an adhesive layer (not shown) may be disposed between the outer peripheral surface of the fiber-reinforced resin tubular portion 30 and the inner peripheral surface of the reinforcing portion 40A to fix them to each other.

[0073] In a pressure vessel 1C according to the third embodiment of the present invention, a reinforcing portion 40A is exposed from the resin 33 of the fiber-reinforced resin tubular portion 30. Therefore, by retrofitting the reinforcing portion 40A to an existing pressure vessel to produce the pressure vessel 1C, the pressure resistance of the existing pressure vessel can be improved.

[0074] <Fourth embodiment> Next, a pressure vessel according to a fourth embodiment of the present invention will be described, focusing on the differences from the pressure vessel 1C according to the third embodiment. As shown in Fig. 18, the pressure vessel 1D according to the fourth embodiment of the present invention has a reinforcing part 40D instead of the reinforcing part 40A.

[0075] <Reinforcement part> The reinforcing portion 40D is a fiber-reinforced resin layer (fiber-containing resin layer) formed in a cylindrical shape so as to fit along the outer circumferential surface of the fiber-reinforced resin tubular portion 30. The reinforcing portion 40D includes a carbon fiber layer 41 and a resin 42 that is impregnated into the carbon fiber layer 41 and hardens. The resin 42 is, for example, a thermosetting resin.

[0076] <Manufacturing method> Next, a method for manufacturing a pressure vessel 1D according to a fourth embodiment of the present invention will be described with reference to the flowchart of Fig. 19. The method for manufacturing a pressure vessel 1D includes a reinforcing portion arranging step (step S8D) instead of the reinforcing portion arranging step (step S8C).

[0077] Step S8D includes a fiber providing step of providing a carbon fiber layer 41 that constitutes a part of the reinforcing portion 40D. In the first half of step S8D, the carbon fiber layer 41 is formed on the outer circumferential surface of the fiber-reinforced resin tubular portion 30 (see FIG. 11).

[0078] In step S8D, the carbon fiber layer 41 is arranged on the outer peripheral surface of the fiber-reinforced resin tubular portion 30 from one direction (only) using a filament winding method by a filament winding device 100D1 shown in FIG. 20. Specifically, the carbon fiber layer 41 is arranged from one direction only, starting from the end member 20X side, which is one end in the axial direction, and winding proceeds from the end member 20X side toward the end member 20Y side, which is the other end in the axial direction. The filament winding device 100D1 can appropriately set and change the orientation angle of the carbon fiber layer 41. A fiber bundle 110 unwound from a bobbin 101 is guided to the fiber-reinforced resin tubular portion 30 via multiple rollers 102. The fiber bundle 110 is impregnated with resin 42 stored in a tank 103 along the way. In this case, in the latter half of step S8D, the resin 42 is hardened by applying heat.

[0079] As another example, in step S8D, the carbon fiber layer 41 is arranged on the outer peripheral surface of the fiber-reinforced resin tubular portion 30 from one direction (only) by a filament winding device 100D2 shown in FIG. In this case, in the latter half of step S8D, the resin 42 is impregnated into the carbon fiber layer 41 and hardened.

[0080] In the pressure vessel 1D according to the fourth embodiment of the present invention, the fibers (carbon fiber layer 41) constituting the fiber reinforced resin are wound using a filament winding method or a multiple yarn filament winding method. Therefore, in the pressure vessel 1D, the reinforcing portion 40D can be formed by arranging fibers efficiently and at low cost.

[0081] In the pressure vessel 1D, the reinforcing portion 40D is exposed from the resin 33 of the fiber-reinforced resin tubular portion 30. Therefore, by retrofitting the reinforcing portion 40A to an existing pressure vessel to produce the pressure vessel 1D, the pressure resistance of the existing pressure vessel can be improved.

[0082] Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and can be modified as appropriate without departing from the spirit and scope of the present invention. For example, the carbon fiber layers 31, 32, and 41 may be woven together to form a so-called crimped structure. As a modified example, the fibrous material used as part of the composite material is not limited to carbon fiber, and may be any fibrous material capable of reinforcing a resin layer (e.g., glass fiber, cellulose fiber, etc.). A recess (annular groove) accommodating the carbon fiber layers 31 and 32 may be formed on the outer circumferential surface of at least one of the first outer diameter portion 21 and the second outer diameter portion 23. Alternatively, three or more fibers having different orientation angles may be wound around the liner 10 and the nozzle portion 20X. The liner 10 may have one end of the tubular portion 11 open and the other end serving as a bottom. The structure of the nozzle portion 20X of the present invention is also applicable to an end member 20Y through which pressurized fluid does not flow. [Explanation of symbols]

[0083] DESCRIPTION OF THE REFERENCE NUMERALS 1A, 1B, 1C, 1D... Pressure vessel 10... Liner 11... Cylindrical portion 12a... Hole portion (small diameter portion) 12b... Side wall portion (end surface portion) 20X... Mouthpiece portion (end member) 20a... Liner side end surface 20b... Opposite end surface 20c... Flow path portion 21... First outer diameter portion (main body portion) 22... Reduced diameter portion (tapered portion) (main body portion) 23... Second outer diameter portion (main body portion) 30... Fiber reinforced resin cylindrical portion 31... Fiber (first carbon fiber layer) 32... Fiber (second carbon fiber layer) 33... Resin 40A, 40B, 40C, 40D... Reinforced portion 41... Fiber (carbon fiber layer) 42... Resin

Claims

1. 1. A pressure vessel for storing pressurized fluid therein, comprising: a liner having a cylindrical portion extending in an axial direction and a side wall portion provided at one end of the cylindrical portion in the axial direction; a nozzle portion disposed to cover the side wall portion and configured to allow the pressurized fluid to enter and exit the liner through a hole formed in the side wall portion; a fiber-reinforced resin cylindrical portion disposed radially outward of the liner and the nozzle portion; a reinforcing portion disposed radially outward of the fiber-reinforced resin tubular portion and suppressing deformation of the fiber-reinforced resin tubular portion in a radial expansion direction; Equipped with an intermediate portion of the fiber-reinforced resin cylindrical portion in the axial direction is exposed from the reinforcing portion, the nozzle portion has a main body portion extending in the axial direction, a liner-side end face of the main body portion that is on the liner side in the axial direction, and an opposite end face of the main body portion that is on the opposite side to the liner in the axial direction, the main body portion has a reduced diameter portion that reduces in diameter as it moves away from the liner in the axial direction, a first outer diameter portion that is closer to the liner-side end face than the reduced diameter portion, and a second outer diameter portion that is closer to the opposite end face than the reduced diameter portion and has an outer diameter smaller than the first outer diameter portion, The reinforcing portion is disposed so as to cover at least a portion of the first outer diameter portion, the reduced diameter portion, and the second outer diameter portion from the outside in the radial direction. Pressure vessel.

2. the reinforcing portion is arranged to cover a boundary portion between the first outer diameter portion and the reduced diameter portion from the radially outer side. The pressure vessel of claim 1.

3. the reinforcing portion is disposed from a boundary between the first outer diameter portion and the reduced diameter portion to an end portion on the opposite end face side of the second outer diameter portion.

3. The pressure vessel of claim 2.

4. a dimension of the first outer diameter portion in the axial direction of the base portion is larger than a dimension of the reduced diameter portion in the axial direction of the base portion and is smaller than a dimension of the second outer diameter portion in the axial direction of the base portion; The pressure vessel of claim 1.

5. the first outer diameter portion and the second outer diameter portion have a cylindrical shape, The reduced diameter portion is a tapered portion. The pressure vessel of claim 1.

6. The reinforcing portion is formed of metal. The pressure vessel of claim 1.

7. The reinforcing portion is formed of steel.

7. The pressure vessel of claim 6.

8. The reinforcing portion is formed of a metal other than an iron-based metal.

7. The pressure vessel of claim 6.

9. The reinforcing portion is formed of a composite material. The pressure vessel of claim 1.

10. The reinforcing portion is formed of a fiber-reinforced resin.

10. The pressure vessel of claim 9.

11. The fibers constituting the fiber reinforced resin are wound around the nozzle at an angle of 80 degrees to 100 degrees with respect to the axis of the nozzle.

11. The pressure vessel of claim 10.

12. The fibers constituting the fiber reinforced resin are wound using a filament winding method or a multiple yarn filament winding method.

12. The pressure vessel of claim 11.

13. the reinforcing portion is fitted onto the fibers constituting the fiber-reinforced resin tubular portion, The resin constituting the fiber-reinforced resin tubular portion is impregnated into the fibers constituting the fiber-reinforced resin tubular portion on which the reinforcing portion is fitted and hardened, and covers the outer peripheral surface of the reinforcing portion. The pressure vessel of claim 1.

14. In the fiber-reinforced resin tubular portion, a thickness of the second outer diameter portion at a radially outer side is greater than a thickness of the first outer diameter portion at a radially outer side. The pressure vessel of claim 1.

15. A method for manufacturing a pressure vessel according to claim 1, comprising the steps of: connecting the liner and the nozzle to each other; a step of disposing the fiber-reinforced resin cylindrical portion radially outward of the cylindrical portion and the mouthpiece portion; a step of arranging the reinforcing portion on the radially outer side of the fiber-reinforced resin cylindrical portion; A method for manufacturing a pressure vessel, comprising:

16. A method for manufacturing a pressure vessel according to claim 9, comprising: connecting the liner and the nozzle to each other; a step of arranging fibers on the radially outer side of the cylindrical portion and the nozzle portion; a step of arranging the reinforcing portion radially outward of the fiber; impregnating the fibers with a resin and curing the resin; Including, In the step of impregnating the fibers with a resin and curing the resin, a portion of the resin is cured in a state in which the resin covers an outer peripheral surface of the reinforcing portion. A method for manufacturing pressure vessels.

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