pressure vessel

Abstract

To provide a pressure vessel capable of suppressing leakage of internal fluid to the outside.SOLUTION: A pressure vessel 10 includes a liner 20 which has a cylindrical body 40 and a pair of domes 50 respectively connected to both ends of the body 40. The pressure vessel 10 further includes a ring 60 which has a barrier property and covers a boundary 23 between the body 40 and the dome 50 from the outside.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a pressure vessel. [Background technology]

[0002] The pressure vessel liner disclosed in Patent Document 1 comprises a first liner component made of a straight cylindrical body with both ends open, and a second liner component having a generally bowl shape joined to both ends of the first liner component. The end of the first liner component and the end of the second liner component are joined to form the pressure vessel liner. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-239966 Summary of the Invention [Problem to be solved by the invention]

[0004] As disclosed in Patent Document 1, when a pressure vessel liner is made up of multiple axially separated components, there is a risk that adjacent components may separate in the axial direction when the internal pressure of the pressure vessel increases or when the pressure vessel undergoes thermal contraction, etc. This could result in the internal fluid leaking to the outside through gaps at the boundaries between the components.

[0005] The present invention was completed in light of the above circumstances, and an object of the present invention is to provide a pressure vessel that can prevent the internal fluid from leaking to the outside. [Means for solving the problem]

[0006] The pressure vessel of the present invention comprises: A pressure vessel comprising a liner having a cylindrical body portion and a pair of dome portions respectively connected to both ends of the body portion, The device is characterized by including a barrier ring that covers the boundary between the body portion and the dome portion from the outside. [Effects of the Invention]

[0007] According to the present invention, even if the body and dome sections separate in the axial direction when the internal pressure of the pressure vessel increases or when the pressure vessel undergoes thermal contraction, the barrier ring can close the gap at the boundary from the outside, thereby preventing fluid inside the pressure vessel from passing through the ring and leaking to the outside. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a pressure vessel of Example 1. [Figure 2] FIG. 1 is a cross-sectional view of a pressure vessel. [Figure 3] FIG. [Figure 4] FIG. 2 is a cross-sectional view showing a part of the pressure vessel near the boundary between the body portion and the dome portion. [Figure 5] FIG. 5 is a cross-sectional view corresponding to FIG. 4, illustrating a state in which a gap occurs at the boundary. [Figure 6] FIG. 10 is a cross-sectional view showing a part of the vicinity of the boundary between the body portion and the dome portion in the pressure vessel of Example 2. [Figure 7] FIG. 10 is a cross-sectional view showing a part of the vicinity of the boundary between the body portion and the dome portion in the pressure vessel of Example 3. [Figure 8] FIG. 10 is a cross-sectional view showing a part of the vicinity of the boundary between the body portion and the dome portion in the pressure vessel of Example 4. [Figure 9] FIG. 10 is a cross-sectional view showing a part of the vicinity of the boundary between the body portion and the dome portion in the pressure vessel of Example 5. DETAILED DESCRIPTION OF THE INVENTION

[0009] In the present invention, it is preferable that seal rings are provided between the inner peripheral surface of the ring and the outer peripheral surface of the body portion, and between the inner peripheral surface of the ring and the outer peripheral surface of the dome portion. With this configuration, it is possible to prevent fluid from leaking to the outside between the inner peripheral surface of the ring and the outer peripheral surface of the body portion, and between the inner peripheral surface of the ring and the outer peripheral surface of the dome portion.

[0010] In the present invention, it is preferable that an end barrier layer be provided on the end face of the body portion and the end face of the dome portion at the boundary portion, which makes it possible to prevent the internal fluid from permeating through the body from the end face to the outside, and to prevent the internal fluid from permeating through the dome portion from the end face to the outside.

[0011] In the present invention, it is preferable that an outer barrier layer be provided on the outer peripheral surface of the body portion and the outer peripheral surface of the dome portion that faces the ring. With this configuration, it is possible to prevent the internal fluid from permeating the body portion or the dome portion and leaking to the outside from the outer peripheral surface of the body portion or the outer peripheral surface of the dome portion that faces the ring.

[0012] In the present invention, it is preferable that the ring has a two-layer structure consisting of a non-barrier ring body and an inner barrier layer formed on the inner peripheral surface of the ring body. With this configuration, it is possible to prevent the internal fluid from leaking to the outside through the inner peripheral surface of the ring body.

[0013] In the present invention, it is preferable that the inner peripheral surface of the ring has claws that protrude inward, and the claws are hooked onto one of the outer peripheral surface of the body portion and the outer peripheral surface of the dome portion. With this configuration, even when the body portion and the dome portion attempt to separate in the axial direction, the claws are hooked onto one of the body portion and the dome portion, thereby fixing the position of the ring relative to the body portion or the dome portion.

[0014] Example 1 A first embodiment of the present invention will be described below with reference to FIGS.

[0015] (Configuration of pressure vessel) The pressure vessel 10 of this embodiment has a cylindrical capsule shape, as shown in Figure 1. The pressure vessel 10 is mounted on a vehicle, for example, and used as a container filled with high-pressure hydrogen gas. Note that in the pressure vessel 10 shown in Figures 1 to 5, the diameter, axial length, thickness of each layer, etc. are exaggerated, and the configuration shown in Figures 1 to 5 is merely an example.

[0016] As shown in Figure 2, the pressure vessel 10 comprises a liner 20, an outer reinforcing layer 30, and a nozzle 11 (see Figure 1). Note that Figure 2 shows the pressure vessel 10 before the nozzle 11 is attached. The pressure vessel 10 has barrier properties. In this Example 1, the barrier properties are defined as the property of preventing or inhibiting a fluid (such as hydrogen gas) filled in the pressure vessel 10 from permeating the pressure vessel 10 and leaking to the outside of the pressure vessel 10.

[0017] 3, the liner 20 includes a body portion 40 and a pair of dome portions 50. The liner 20 is configured by combining the body portion 40 and the pair of dome portions 50.

[0018] The body 40 has a cylindrical shape that is long in the axial direction (direction along the axis L). The inner diameter of the body 40 is constant over the entire length. The outer diameter of the body 40 is constant over the entire length, except for a recess 43, which will be described later. The body 40 is made of fiber-reinforced resin, such as carbon fiber reinforced plastic (CFRP) or glass fiber reinforced plastic (GFRP). The body 40 is formed by hoop-winding, for example, a fiber bundle (not shown) impregnated with a liquid thermosetting resin, or a fiber bundle impregnated with a thermosetting resin that has been brought to a semi-cured state (prepreg fiber) using a filament winding method. The fiber bundle is made of thread-like fibers, such as carbon fiber, glass fiber, or Kepler fiber, which are bundled together.

[0019] The dome section 50 is a hemispherical portion connected to the longitudinal end of the body section 40. The diameter of the dome section 50 decreases with increasing distance from the body section 40. The dome section 50 is made of fiber-reinforced resin, such as carbon fiber reinforced plastic (CFRP) or glass fiber reinforced plastic (GFRP). The dome section 50 is formed by laminating, for example, fiber bundles (not shown) impregnated with liquid thermosetting resin, or fiber bundles impregnated with thermosetting resin in a semi-cured state (prepreg fiber) by hand layup, forming a spherical shell, and dividing the resulting molded product in half. The fiber bundles are made of bundles of filamentous fibers, such as carbon fiber, glass fiber, or Kepler fiber. A mouthpiece 11 is provided at the top of the dome section 50, as shown in FIG. 1.

[0020] As shown in Fig. 2, an inner barrier layer 21 having barrier properties is provided on the inner peripheral surface of the liner 20. The inner barrier layer 21 is formed, for example, by adding an ultraviolet illuminant as a masterbatch to a base material that allows the transmission of ultraviolet and visible light. The inner barrier layer 21 is used for the purpose of blocking or suppressing the transmission of fluid stored in the liner 20 to the outside of the liner 20. The inner barrier layer 21 is composed of a barrel-side barrier layer 41 provided on the inner peripheral surface of the barrel 40 and a dome-side barrier layer 51 provided on the inner peripheral surface of the dome 50.

[0021] As shown in Fig. 3, recesses 43 recessed radially inward are provided at both axial ends of the outer peripheral surface of the body portion 40. The recesses 43 are provided around the entire axial circumference of the body portion 40. The portion of the body portion 40 where the recesses 43 are provided is thinner than the other portion of the body portion 40 (the portion toward the center in the axial direction). The outer diameter dimension of the recesses 43 is constant along the axial direction. The cross-sectional shape of the outer peripheral surface of the recesses 43 is a circle concentric with the body portion 40.

[0022] As shown in FIG. 3, the end of the outer peripheral surface of the dome portion 50 (the end on the trunk portion 40 side) is provided with a recess 53 that is recessed radially inward. The recess 53 is provided around the entire circumference of the dome portion 50 around the axis. The portion of the dome portion 50 where the recess 53 is provided is thinner than the other portion of the dome portion 50 (the portion toward the top). The outer diameter dimension of the recess 53 is constant along the axial direction. The cross-sectional shape of the outer peripheral surface of the recess 53 is a circle that is concentric with the dome portion 50.

[0023] As shown in Fig. 4, when the body portion 40 and the dome portion 50 are connected, the recessed portions 43 and 53 form the groove portion 22. The end face 42 of the body portion 40 and the end face 52 of the dome portion 50 face each other in the axial direction. The outer diameter of the recessed portion 53 is approximately the same as the outer diameter of the recessed portion 43, as shown in Fig. 4.

[0024] As shown in FIG. 4 , a ring 60 is disposed within the groove portion 22. The ring 60 has barrier properties. Examples of materials that can be used to form the ring 60 include stainless steel (SUS316) and aluminum alloy (A6061), which have barrier properties. The inner and outer diameters of the ring 60 are constant throughout the entire axial length. A pair of seal grooves 62, into which a pair of seal rings 61 are respectively fitted, is provided on the inner circumferential surface of the ring 60. The pair of seal grooves 62 are positioned slightly inward (toward the other end) from each end of the ring 60. The pair of seal rings 61 are respectively provided between the inner circumferential surface of the ring 60 and the outer circumferential surface of the barrel portion 40, and between the inner circumferential surface of the ring 60 and the outer circumferential surface of the dome portion 50.

[0025] As shown in Fig. 4, an end surface barrier layer 44 is provided around the entire periphery of the end surface 42 of the barrel portion 40. The end surface barrier layer 44 has a configuration similar to that of, for example, the inner barrier layer 21. The end surface barrier layer 44 is continuous with the barrel portion-side barrier layer 41 around the entire periphery. An outer peripheral barrier layer 45 is provided around the entire periphery on the surface of the outer peripheral surface of the barrel portion 40 that faces the ring 60 (the outer peripheral surface of the recess 43). The outer peripheral barrier layer 45 has a configuration similar to that of, for example, the inner barrier layer 21. The outer peripheral barrier layer 45 is continuous with the end surface barrier layer 44 around the entire periphery.

[0026] As shown in Fig. 4, an end face barrier layer 54 is provided around the entire periphery of the end face 52 of the dome section 50. The end face barrier layer 54 has a structure similar to that of the inner barrier layer 21, for example. The end face barrier layer 54 is continuous with the dome section-side barrier layer 51 around the entire periphery. An outer periphery barrier layer 55 is provided around the entire periphery on the surface of the outer periphery of the dome section 50 that faces the ring 60 (the outer periphery of the recess 53). The outer periphery barrier layer 55 has a structure similar to that of the inner barrier layer 21, for example. The outer periphery barrier layer 55 is continuous with the end face barrier layer 54 around the entire periphery.

[0027] As shown in FIG. 4 , the ring 60 covers the boundary 23 between the barrel portion 40 and the dome portion 50 from the outside. The boundary 23 is defined by the end face 42 of the barrel portion 40 and the end face 52 of the dome portion 50 (more specifically, the end face barrier layer 44 of the barrel portion 40 and the end face barrier layer 54 of the dome portion 50). The barrel portion 40 and the dome portion 50 are assembled together with the end face barrier layer 44 and the end face barrier layer 54 in contact. The inner peripheral surface of the ring 60 is in contact with the outer peripheral barrier layer 45 and the outer peripheral barrier layer 55. The seal ring 61 on the barrel portion 40 side is in contact with the inner surface of the seal groove 62 on the barrel portion 40 side and the outer peripheral barrier layer 45. The seal ring 61 on the dome portion 50 side is in contact with the inner surface of the seal groove 62 on the dome portion 50 side and the outer peripheral barrier layer 55. The boundary 23 is located between the pair of seal rings 61 in the axial direction.

[0028] The external reinforcing layer 30 surrounds the liner 20. The external reinforcing layer 30 is made of fiber-reinforced resin, such as carbon fiber reinforced plastic (CFRP) or glass fiber reinforced plastic (GFRP). The external reinforcing layer 30 is formed so as to cover the entire outer periphery of the liner 20. The external reinforcing layer 30 is formed by low helical winding, for example, by a filament winding method. Low helical winding is a winding method in which the winding is performed at an inclination angle of 40° relative to the axial direction. The external reinforcing layer 30 is formed by winding, for example, fiber bundles (not shown) impregnated with liquid thermosetting resin, or fiber bundles impregnated with thermosetting resin in a semi-cured state (prepreg fiber), around the outer surface of the liner 20, which rotates around the axis. The fiber bundles are made by bundling thread-like fibers made of carbon fiber, glass fiber, Kepler fiber, etc.

[0029] Unlike the pressure vessel 10 of Example 1, for example, in a configuration in which the liner is integrally formed, the external reinforcing layer, which is helically wound to ensure the strength of both ends of the liner (portions corresponding to the dome portions), becomes wasted and does not contribute to the strength of the central portion of the liner (portion corresponding to the barrel portion). In particular, the larger the diameter or length of the liner, the greater the amount of wasted fiber-reinforced resin, resulting in increased costs. Therefore, by forming the liner 20 separately into the barrel portion 40 and the pair of dome portions 50, as in the pressure vessel 10 of Example 1, the amount of fiber-reinforced resin required can be reduced. Specifically, when the fiber-reinforced resin is layered in a spherical shell shape by hand layup to form the dome portion 50, the amount of fiber-reinforced resin can be adjusted to achieve the required strength. This reduces the amount of fiber-reinforced resin to be helically wound when forming the external reinforcing layer 30, and consequently reduces the amount of fiber-reinforced resin used in the external reinforcing layer 30.

[0030] (Effects of this embodiment) The effects of the first embodiment will be described below. In a configuration in which the liner 20 is divided into a barrel portion 40 and a dome portion 50, as in the pressure vessel 10 of the first embodiment, it is expected that the barrel portion 40 and the dome portion 50 will separate in the axial direction as shown in FIG. 5 when the internal pressure of the pressure vessel 10 increases or when the pressure vessel 10 undergoes thermal contraction. Specifically, it is expected that the end face 42 of the barrel portion 40 and the end face 52 of the dome portion 50 (more specifically, the end face barrier layer 44 of the barrel portion 40 and the end face barrier layer 54 of the dome portion 50) will separate, creating a gap at the boundary portion 23. FIG. 5 shows a state in which the relative position of the ring 60 and the barrel portion 40 remains unchanged, but the relative position of the ring 60 and the dome portion 50 changes. Even in such a case, the ring 60, which has barrier properties, closes the gap at the boundary portion 23 from the outside. This prevents fluid inside the pressure vessel 10 from passing through the ring 60 and leaking to the outside.

[0031] In the pressure vessel 10 of the first embodiment, seal rings 61 are provided between the inner peripheral surface of the ring 60 and the outer peripheral surface of the barrel portion 40, and between the inner peripheral surface of the ring 60 and the outer peripheral surface of the dome portion 50. This makes it possible to prevent fluid from leaking to the outside between the inner peripheral surface of the ring 60 and the outer peripheral surface of the barrel portion 40, and between the inner peripheral surface of the ring 60 and the outer peripheral surface of the dome portion 50. The pair of seal rings 61 are provided at positions where they can come into contact with the outer peripheral surfaces of the barrel portion 40 and the dome portion 50, even if a gap of a predetermined size (e.g., a gap with an axial length of 30 mm) occurs at the boundary portion 23 of the liner 20. Furthermore, because the rings 60 are covered from the outside by the outer reinforcing layer 30, the sealing performance provided by the seal rings 61 is easily maintained.

[0032] In the pressure vessel 10 of the first embodiment, end surface barrier layers 44, 54 having barrier properties are provided on the end surface 42 of the barrel portion 40 and the end surface 52 of the dome portion 50 at the boundary portion 23. This makes it possible to prevent the internal fluid from permeating through the barrel portion 40 from the end surface 42 to the outside, and to prevent the internal fluid from permeating through the dome portion 50 from the end surface 52 to the outside.

[0033] In the pressure vessel 10 of the first embodiment, peripheral barrier layers 45, 55 having barrier properties are provided on the outer peripheral surface of the barrel portion 40 and on the surfaces of the outer peripheral surface of the dome portion 50 that face the ring 60. This makes it possible to prevent the internal fluid from passing through the barrel portion 40 or the dome portion 50 from the surfaces of the outer peripheral surface of the barrel portion 40 or the dome portion 50 that face the ring 60 and leaking to the outside.

[0034] <Example 2> A second embodiment of the present invention will be described below with reference to Fig. 6. The pressure vessel 210 of the second embodiment differs from that of the first embodiment in the ring configuration, but the other configurations are the same as those of the first embodiment. Therefore, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0035] (Configuration of pressure vessel) As shown in FIG. 6 , the pressure vessel 210 of this embodiment includes a ring 260. The ring 260 has a two-layer structure consisting of a non-barrier ring body 263 and an inner barrier layer 264 with barrier properties formed on the inner surface of the ring body 263. The ring body 263 is made of, for example, a resin with higher rigidity than fiber-reinforced resin (carbon fiber reinforced plastic (CFRP), glass fiber reinforced plastic (GFRP), etc.). This allows the ring 260 to be lightweight. The inner barrier layer 264 has a structure similar to that of the inner barrier layer 21 described in Example 1, for example. The inner barrier layer 264 is disposed between the boundary portion 23 of the liner 20 and the ring body 263, thereby preventing the fluid inside from leaking from the inner surface of the ring body 263 through the ring body 263 to the outside.

[0036] Example 3 A third embodiment of the present invention will be described below with reference to Fig. 7. A pressure vessel 310 of the third embodiment differs from that of the first embodiment in the configuration of the ring, but other configurations are the same as those of the first embodiment. Therefore, the same components as those of the first embodiment are denoted by the same reference numerals, and their description will be omitted.

[0037] (Configuration of pressure vessel) As shown in Figure 7, the pressure vessel 310 of this embodiment includes a ring 360. Claws 365 that protrude inward are provided on the inner peripheral surface of the ring 360. The claws 365 are hooked onto the outer peripheral surface of the body 40 (hooking portions 346). The claws 365 are provided around the entire axial circumference of the ring 360. The hooking portions 346 are recessed radially inward at the inner end of the axial direction of the recess 43 (the end on the other recess 43 side). The hooking portions 346 are provided around the entire axial circumference of the recess 43.

[0038] According to this configuration, when the body portion 40 and the dome portion 50 attempt to separate in the axial direction, the claw portions 365 hook onto the body portion 40, thereby fixing the position of the ring 360 relative to the body portion 40. This prevents the ring 360 from moving too close to the body portion 40 or the dome portion 50, causing the seal ring 61 to be exposed in the gap at the boundary portion 23. Furthermore, there is no need to consider changes in the positional relationship between the ring 360 and the body portion 40 in order to prevent the seal ring 61 from being exposed in the gap at the boundary portion 23, making it easier to shorten the axial length of the ring 360.

[0039] Example 4 A fourth embodiment of the present invention will be described below with reference to Fig. 8. A pressure vessel 410 of the fourth embodiment differs from that of the first embodiment in the ring configuration and in that it does not have the outer barrier layer 45 and the outer barrier layer 55, but the other configurations are the same as those of the first embodiment. Therefore, the same components as those of the first embodiment are denoted by the same reference numerals and will not be described again.

[0040] (Configuration of pressure vessel) 8, the pressure vessel 410 of this embodiment is provided with a ring 460. Unlike the ring 60 of the first embodiment, the ring 460 is not provided with a seal ring or a seal groove.

[0041] 8, unlike the body portion 40 of Example 1, the outer peripheral surface of the body portion 40 does not have an outer peripheral barrier layer provided on the surface facing the ring 460 (the outer peripheral surface of the recess 43). Unlike the dome portion 50 of Example 1, the outer peripheral surface of the dome portion 50 does not have an outer peripheral barrier layer provided on the surface facing the ring 460 (the outer peripheral surface of the recess 53).

[0042] 8, groove portion 22 (recess 43 of body portion 40 and recess 53 of dome portion 50) and ring 460 are in contact with each other. Ring 460 is made of a material (stainless steel (SUS316), aluminum alloy (A6061), etc.) having the same barrier properties as ring 60 of Example 1. Even with this configuration, the close contact between ring 460 and groove portion 22 ensures sealing performance by ring 460.

[0043] <Example 5> A fifth embodiment of the present invention will be described below with reference to Fig. 9. A pressure vessel 510 of the fifth embodiment differs from that of the fourth embodiment in that it is provided with an outer barrier layer 45 and an outer barrier layer 55, but other configurations are the same as those of the fourth embodiment. Therefore, the same components as those of the fourth embodiment are denoted by the same reference numerals, and their description will be omitted.

[0044] (Configuration of pressure vessel) 9, in pressure vessel 510 of this embodiment, a peripheral barrier layer 45 having a configuration similar to that of peripheral barrier layer 45 of Example 1 is provided on the surface of the outer peripheral surface of barrel portion 40 that faces ring 460 (the outer peripheral surface of recess 43). A peripheral barrier layer 55 having a configuration similar to that of peripheral barrier layer 55 of Example 1 is provided on the surface of the outer peripheral surface of dome portion 50 that faces ring 460 (the outer peripheral surface of recess 53). With this configuration, it is possible to prevent the internal fluid from passing through barrel portion 40 or dome portion 50 from the surface of the outer peripheral surface of barrel portion 40 or dome portion 50 that faces ring 460 and leaking to the outside.

[0045] <Other Examples> The present invention is not limited to the embodiments described above and illustrated in the drawings, and the following embodiments, for example, are also included within the technical scope of the present invention. (1) In the above-mentioned Example 1, when a gap occurs at the boundary portion 23, as shown in FIG. 5, the relative position between the ring 60 and the body portion 40 does not change, but the relative position between the ring 60 and the dome portion 50 changes. However, a configuration in which the relative position between the ring 60 and the dome portion 50 does not change, but the relative position between the ring 60 and the body portion 50 changes, may also be used. (2) In the above-described Example 1, the seal ring 61 is assembled in the seal groove 62 provided on the inner peripheral surface of the ring 60. However, instead of the seal groove 62, a seal groove into which the seal ring 61 is assembled may be provided on the outer peripheral surface of the body portion 40 or the outer peripheral surface of the dome portion 50. (3) In the third embodiment, the claws 365 are configured to hook onto the outer circumferential surface of the body 40 , but they may be configured to hook onto the outer circumferential surface of the dome portion 50 . (4) In the third embodiment, the claws 365 are provided around the entire circumference of the ring 360, but they may be provided around a portion of the circumference. [Explanation of symbols]

[0046] 10, 210, 310, 410, 510...Pressure vessels 20...liner 30...External reinforcement layer 40...Torso 42...End face 44...End face barrier layer 45...Outer barrier layer 50...Dome section 52...End face 54...End face barrier layer 55...Outer barrier layer 60, 260, 360, 460… rings 61...Seal ring 263...Ring body 264...Inner barrier layer 365...Claw part

Claims

1. A pressure vessel comprising a liner having a cylindrical body portion and a pair of dome portions respectively connected to both ends of the body portion, a barrier ring that covers the boundary between the body portion and the dome portion from the outside, a recessed portion recessed radially inward is provided at both ends of the outer peripheral surface of the body portion, A recess recessed radially inward is provided at an end of the outer peripheral surface of the dome portion, a groove portion is formed by the recessed portion of the body portion and the recessed portion of the dome portion, The ring is disposed within the groove; A pressure vessel characterized in that the outer peripheral surface of the ring is flush with the outer peripheral surfaces of the body portion and the dome portion.

2. 2. The pressure vessel according to claim 1, wherein seal rings are provided between the inner peripheral surface of the ring and the outer peripheral surface of the barrel portion, and between the inner peripheral surface of the ring and the outer peripheral surface of the dome portion.

3. 3. The pressure vessel according to claim 1, wherein an end barrier layer is provided on the end surface of the body portion and the end surface of the dome portion at the boundary portion.

4. 4. The pressure vessel according to claim 1, wherein an outer barrier layer is provided on the outer peripheral surface of the barrel portion and the outer peripheral surface of the dome portion that face the ring.

5. A pressure vessel comprising a liner having a cylindrical body and a pair of dome portions connected to both ends of the body, a barrier ring that covers the boundary between the body portion and the dome portion from the outside, A pressure vessel characterized in that the ring has a two-layer structure consisting of a non-barrier ring body and an inner barrier layer formed on the inner surface of the ring body.

6. A pressure vessel comprising a liner having a cylindrical body and a pair of dome portions connected to both ends of the body, a barrier ring that covers the boundary between the body portion and the dome portion from the outside, The ring has an inner peripheral surface provided with claws that protrude inward, The pressure vessel is characterized in that the claw portion is hooked onto one of the outer circumferential surface of the body portion and the outer circumferential surface of the dome portion.

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