High-pressure hydrogen container

Abstract

To provide a high-pressure hydrogen container capable of suppressing increase in manufacturing costs and weight even when the container has a large capacity.SOLUTION: A high-pressure hydrogen container comprises: a cylindrical body that stores high-pressure hydrogen in an internal storage space; a lid body that is fitted into a cylindrical body from an open end part, closes the open end part of the cylindrical body and forms a space between the inside of the cylindrical body and an end surface in a pipe axial direction; and a fixing member that is fitted into the cylindrical body from the open end part, has an outer peripheral surface screwed to the inner peripheral surface of the cylindrical body, and supports and fixes the lid body from the outside. A screw thread is formed on the inner peripheral surface of the cylindrical body for screwing the fixing member, and a ring-shaped reinforcing member is provided in close contact with at least a portion of the outer peripheral surface corresponding to a position where the screw thread is formed.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a high-pressure hydrogen container for storing high-pressure hydrogen.

Background Art

[0002] Conventionally, various high-pressure hydrogen containers for storing high-pressure hydrogen inside are known and already in practical use. For example, the high-pressure hydrogen container disclosed in Patent Document 1 includes a cylindrical steel container for storing high-pressure hydrogen in an internal storage space, a plug for closing the open end of the steel container, and a gland nut provided at the open end of the cylinder body for supporting and fixing the plug from the outside. Further, Patent Document 2 discloses a technique of providing a reinforcing ring having an inner thickness of 5% to 10% with respect to the outer diameter of the cylindrical cylinder portion on the outer peripheral surface of the end portion of the accumulator container to reduce the bottom stress of the screw.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in recent years, with the increasing use of hydrogen, there has been a demand for increasing the capacity of high-pressure hydrogen containers. For example, by increasing the inner diameter of the container, reducing the wall thickness of the container, and shortening the length of the gland nut in the tube axis direction, the capacity of the high-pressure hydrogen container can also be increased. However, with such a configuration, the overall rigidity decreases, and it cannot withstand the internal pressure of the stored high-pressure hydrogen, and there is a risk that the open end of the container may deform so as to expand outward. On the other hand, if the inner diameter of the container is increased and the wall thickness of the container and the length of the gland nut in the tube axis direction are increased so as to withstand the internal pressure of the stored high-pressure hydrogen, the manufacturing cost increases and the weight increases, which may exceed the allowable limit when transporting by a crane or the like. Further, in the lid portion of Patent Document 2, since a protruding portion extending outward is provided, although it is difficult for the open end of the cylindrical cylinder portion to deform outward, the structure of the lid portion becomes complicated by the amount of the protruding portion provided, and the manufacturing cost and weight increase.

[0005] The present invention has been made to solve the above-described problems, and an object thereof is to provide a high-pressure hydrogen container that can suppress an increase in manufacturing cost and weight even when the capacity of the container is increased.

Means for Solving the Problems

[0006] The high-pressure hydrogen container according to the present invention includes a cylindrical body that stores high-pressure hydrogen in an internal storage space, a lid body that is fitted into the inside from the open end portion of the cylindrical body, closes the open end portion of the cylindrical body, and forms a space between the inside of the cylindrical body and the end face in the tube axis direction, and a fixing member that is fitted into the inside from the open end portion of the cylindrical body and whose outer peripheral surface is screwed and fastened to the inner peripheral surface of the cylindrical body to support and fix the lid body from the outside. A screw thread for screwing and fastening the fixing member is formed on the inner peripheral surface of the cylindrical body, and a ring-shaped reinforcing member is provided in close contact with at least a part of the outer peripheral surface corresponding to the position where the screw thread is formed.

Effects of the Invention

[0007] According to the present invention, a thread for screwing a fixing member is formed on the inner peripheral surface of the cylindrical body, and a ring-shaped reinforcing member is closely attached to at least a part of the outer peripheral surface of the cylindrical body at a portion corresponding to the position where the thread is formed. Therefore, it is possible to suppress a situation in which the opening end of the cylindrical body is deformed so as to expand outward due to the internal pressure of the high-pressure hydrogen stored in the storage space. Thus, it is possible to increase the inner diameter of the cylindrical body, reduce the wall thickness of the cylindrical body, and shorten the length of the fixing member in the tube axis direction, thereby increasing the capacity of the high-pressure hydrogen container and suppressing an increase in manufacturing cost and weight.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Mode for Carrying Out the Invention

[0009] Hereinafter, embodiments will be described with reference to the drawings. In each figure, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will be omitted or simplified as appropriate. In addition, regarding the configuration shown in each figure, the shape, size, arrangement, etc. can be appropriately changed within the scope of the present invention.

[0010] Embodiment. FIG. 1 is a cross-sectional view schematically showing an example of a high-pressure hydrogen container 100 according to an embodiment. FIG. 2 is an enlarged view of part A shown in FIG. 1. FIG. 3 is an explanatory view of a conventional high-pressure hydrogen container, in which the magnitude of the axial stress at the open end of the cylindrical body is obtained by FEM analysis. FIG. 4 is an explanatory view of a high-pressure hydrogen container 100 with increased capacity, in which the magnitude of the axial stress at the open end of the cylindrical body 1 is obtained by FEM analysis. FIG. 5 is an explanatory view showing the action of stress when the capacity of the high-pressure hydrogen container 100 is increased.

[0011] (High-pressure hydrogen container 100) The high-pressure hydrogen container 100 according to the present embodiment stores high-pressure hydrogen therein. The high-pressure hydrogen container 100 is installed, for example, in a hydrogen station that supplies hydrogen to a vehicle or the like. As shown in FIG. 1, the high-pressure hydrogen container 100 includes a cylindrical body 1, a lid body 2, a fixing member 3, a carbon fiber reinforced resin layer 4, and a reinforcing member 5. In the high-pressure hydrogen container 100, a space surrounded by the cylindrical body 1 and the lid body 2 serves as a storage space 10 for storing high-pressure hydrogen.

[0012] (Cylindrical body 1) The cylindrical body 1 stores high-pressure hydrogen in the storage space 10 formed together with the lid body 2. The high-pressure hydrogen stored in the storage space 10 is supplied to a vehicle or the like through a pipe (not shown) communicating with the outside. The cylindrical body 1 is formed of, for example, low alloy steel. Low alloy steel is, for example, chromium molybdenum steel, nickel chromium molybdenum steel, manganese chromium steel, manganese steel, or boron-added steel. The cylindrical body 1 has a cylindrical shape with both ends open. Note that the cylindrical body 1 may have a bottomed cylindrical shape with only one end open, for example. In addition, the cylindrical body 1 is not limited to a cylindrical shape and may have other shapes such as a rectangular tube shape.

[0013] On the inner surface at the opening end of the cylinder body 1, a thread 11 for joining the fixing member 3 is formed. The thread 11 is formed in a predetermined section from the opening end of the cylinder body 1 toward the inside. Next to the thread 11, a relief portion 12 having a stepped shape recessed in the radial direction is formed. The relief portion 12 is a portion where the inner diameter dimension is larger than that of the thread 11, and serves as a relief for the tool when machining the thread 11. Both ends of the relief portion 12 in the tube axis direction X of the cylinder body 1 are inclined surfaces. Thereby, the cylinder body 1 can gently change the inner diameter, and can relieve the pressure in the storage space 10 and the stress generated by the fastening of the thread 11.

[0014] On the inner surface of the cylinder body 1, a seal surface 13 that contacts the outer peripheral surface of the lid body 2 is formed. The seal surface 13 is formed between the storage space 10 and the relief portion 12. The seal surface 13 is formed to prevent the high-pressure hydrogen stored in the storage space 10 from leaking to the outside. The seal surface 13 is preferably formed of a smooth surface to maintain the sealing property. Note that the inner diameter dimension of the cylinder body 1 at the portion where the seal surface 13 is formed may be appropriately changed and set in relation to other constituent members.

[0015] The decarburized layer on the inner peripheral surface of the cylinder body 1 has been removed by machining. Further, after removing the decarburized layer from the inner peripheral surface of the cylinder body 1, residual compressive stress is applied by irradiating shot balls having a large mass. The residual compressive stress may be applied not only to the inner peripheral surface of the cylinder body 1 forming the storage space 10, but also to the thread 11, the relief portion 12, and the seal surface 13.

[0016] Hydrogen gas may stay in the thread 11 and the relief portion 12 where the hydrogen gas leaked from the seal surface 13 may stay. The stress generating portions of the thread 11 and the relief portion 12 may have their strength reduced by the leaked hydrogen gas. Therefore, in order to discharge the staying hydrogen gas, a discharge hole (not shown) may be provided to communicate the outside of the cylinder body 1 with the space formed by the relief portion 12. Alternatively, a plurality of holes may be provided to communicate the outside of the cylinder body 1 with the space formed by the relief portion 12, and the gas in the space and the air outside the cylinder body 1 may be configured to circulate.

[0017] (Cover 2) The cover 2 is a plug that is fitted into the opening end of the cylindrical body 1 from the inside and closes the opening end of the cylindrical body 1. The cover 2 is formed in a substantially cylindrical shape, with one end face facing the storage space 10 and the other end face arranged to face the fixing member 3. Since the cover 2 comes into contact with the high-pressure hydrogen stored in the storage space 10, it is made of a material with high strength against the high-pressure hydrogen at low temperature. As an example, the cover 2 is formed of, for example, austenitic stainless steel. Note that the cover 2 may be made of other materials as long as it is excellent in brittleness against high-pressure hydrogen. As an example, the length of the cover 2 in the pipe axis direction X of the cylindrical body 1 is about 125 mm. However, the length of the cover 2 is not limited to about 125 mm and shall be appropriately changed and designed according to the size and shape of the cylindrical body 1. At least one of the covers 2 arranged at both ends of the cylindrical body 1 is provided with a valve connected to a hydrogen passage hole (not shown) and is used for filling or discharging high-pressure hydrogen.

[0018] The cover 2 is provided with a seal portion (not shown) on the outer peripheral surface facing the seal surface 13 of the cylindrical body 1. The seal portion has, as an example, a groove formed on the outer peripheral surface of the cover 2 and a seal member fitted into the groove and contacting the seal surface 13. The seal member is, as an example, an O-ring. By the seal surface 13 of the cylindrical body 1 and the seal member of the cover 2 coming into contact, the gap between the inner surface of the cylindrical body 1 and the outer surface of the cover 2 is closed. Note that a space is formed between the inside of the cylindrical body 1 and the end face of the cover 2 in the pipe axis direction. That is, the end face of the cover 2 in the pipe axis direction has a planar shape and there are no protruding portions or the like.

[0019] (Fixing member 3) The fixing member 3 is fitted into the opening end of the cylindrical body 1 from the outside and screwed and fastened to the inner peripheral surface of the cylindrical body 1 to support and fix the lid body 2 from the outside. The fixing member 3 is a ground nut having a thread 30 formed on the outer peripheral surface for screwing and fastening to the thread 11 of the cylindrical body 1. By being screwed and fastened to the cylindrical body 1, the position of the fixing member 3 in the pipe axis direction X is fixed. The fixing member 3 can support the lid body 2 by abutting one end face against the outer surface of the lid body 2 with respect to the lid body 2 against which the axial force in the pipe axis direction X of the cylindrical body 1 acts due to the high-pressure hydrogen in the storage space 10. The fixing member 3 does not come into contact with high-pressure hydrogen and is not directly exposed to low temperature. Therefore, it is sufficient that the fixing member 3 can ensure the strength of screw fastening, and a low alloy steel similar to that of the cylindrical body 1 may be adopted. However, the fixing member 3 is not limited to low alloy steel and may be made of other materials. Although not shown, the fixing member 3 may be integrally formed with the lid body 2.

[0020] (Carbon fiber reinforced resin layer 4) The carbon fiber reinforced resin layer 4 is provided on the outer peripheral surface of the cylindrical body 1, mainly on the outer peripheral surface corresponding to the storage space 10. The carbon fiber reinforced resin layer 4 is a composite material using carbon fiber as a reinforcing material and impregnating it with resin to improve the strength, and is called CFRP. The high-pressure hydrogen container 100 can improve the pressure resistance and fatigue characteristics by the carbon fiber reinforced resin layer 4.

[0021] In the case of the illustrated example, the carbon fiber reinforced resin layer 4 is provided up to a part facing the lid body 2. However, the carbon fiber reinforced resin layer 4 is not limited to the illustrated range, and may be provided only on the outer peripheral surface corresponding to the storage space 10, or may be extended and provided to other parts. The carbon fiber reinforced resin layer 4 is provided on the outer peripheral surface of the cylindrical body 1 so that the thickness is substantially constant.

[0022] The carbon fiber is not particularly limited, and for example, any of PAN-based, pitch-based, etc. can be used. The volume content ratio of the carbon fiber in the carbon fiber reinforced resin layer 4 can be determined in accordance with Japanese Industrial Standard JIS K 7075 (1991), and is usually preferably in the range of 50% to 80%.

[0023] Incidentally, in recent years, with the increasing utilization of hydrogen, there has been a demand for increasing the capacity of the high-pressure hydrogen container 100. For example, by increasing the inner diameter of the cylindrical body 1 and reducing the wall thickness of the cylindrical body 1 while shortening the length of the fixing member 3 in the tube axis direction X, the capacity of the high-pressure hydrogen container 100 can be increased. For reference, the dimensions of a conventional high-pressure hydrogen container are, for example, an outer diameter of the cylindrical body of 350 mm, a wall thickness of the cylindrical body of 50 mm, a wall thickness of the carbon fiber reinforced resin layer of 8 mm, a length of the fixing member in the tube axis direction X of 160 mm, and an internal volume of 200 L. In this case, although the capacity of the high-pressure hydrogen container is small, as shown in FIG. 3, the axial stress that most greatly occurs at the M portion at the inner end of the fixing member is 474 MPa, which satisfies the allowable range as the durability of the container.

[0024] On the other hand, in the high-pressure hydrogen container 100 according to the present embodiment, as an example, the outer diameter of the cylindrical body 1 is 432 mm, the wall thickness of the cylindrical body 1 is 40 mm, the wall thickness of the carbon fiber reinforced resin layer 4 is 17 mm, the length of the fixing member 3 in the tube axis direction X is 100 mm, the thickness is 52 mm, and the internal volume is 425 L. Thereby, the capacity of the high-pressure hydrogen container 100 can be increased. However, by setting such dimensions, as shown in FIG. 4, the axial stress that most greatly occurs at the M portion at the inner end of the fixing member 3 becomes 989 MPa, greatly exceeding the allowable range as the durability of the container. Note that FIGS. 3 and 4 are analyzed under the same condition that the internal pressure is 82 MPa.

[0025] In this way, by increasing the capacity of the high-pressure hydrogen container 100, the overall rigidity decreases, and it cannot withstand the internal pressure of the stored high-pressure hydrogen. As shown in FIG. 5, compression occurs on the storage space 10 side of the lid body 2, and tension occurs on the fixing member 3 side of the lid body 2. Further, compression occurs at the portion where the relief portion 12 of the cylindrical body 1 is provided, and tension occurs at the open end of the cylindrical body 1. Furthermore, compression occurs at the inner end portion of the fixing member 3 facing the lid body 2. As a result, it is presumed that bending deformation occurs in the screw fastening portion and the stress increases. As a result, as shown in FIG. 5, the lid body 2 bends like a bowl toward the fixing member 3 side, and accordingly, the fixing member 3 deforms so as to open outward. Then, due to the deformation of the fixing member 3, the open end of the cylindrical body 1 deforms so as to expand outward.

[0026] In addition, if the wall thickness of the cylindrical body 1 and the length of the fixing member 3 in the pipe axis direction X are increased so as to withstand the internal pressure of the stored high-pressure hydrogen while increasing the inner diameter of the container, the manufacturing cost increases and the weight increases, which may exceed the allowable limit when transporting by a crane or the like.

[0027] FIG. 6 is an explanatory diagram schematically showing an example of a conventional high-pressure hydrogen container. Incidentally, as a conventional high-pressure hydrogen container, as shown in FIG. 6, it has a cylindrical body a with both ends open, a flange b provided on the outer peripheral surface at one open end of the cylindrical body a, a first lid body d provided in contact with one open end surface of the cylindrical body a and bolted to the flange b, and a second lid body e for closing the other open end of the cylindrical body a. In the conventional high-pressure hydrogen container shown in FIG. 6, when the inner diameter of the cylindrical body a is increased to increase the capacity, it is necessary to form the first lid body d and the second lid body e larger so as to withstand the internal pressure of the stored high-pressure hydrogen, and it is also necessary to enlarge the flange b for supporting the first lid body d and firmly fix it to the outer peripheral surface of the cylindrical body a. That is, when increasing the capacity with this configuration of the high-pressure hydrogen container, the wall thickness of the cylindrical body a cannot be made thin in order to firmly fix the flange b, so the weight of the cylindrical body a increases, and the weights of the flange b, the first lid body d, and the second lid body e also increase. Therefore, when increasing the capacity of this high-pressure hydrogen container, the manufacturing cost increases and the weight increases, which may exceed the allowable limit when transporting it by a crane or the like.

[0028] Therefore, in the high-pressure hydrogen container 100 according to the present embodiment, while increasing the inner diameter of the cylindrical body 1 and reducing the wall thickness of the cylindrical body 1, the length of the fixing member 3 in the pipe axis direction X is shortened to increase the capacity of the high-pressure hydrogen container 100. And in order to suppress the situation where the open end of the cylindrical body 1 deforms so as to expand outward, as shown in FIGS. 1 and 2, a ring-shaped reinforcing member 5 is provided in close contact with the outer peripheral surface of the cylindrical body 1 corresponding to the position where the thread 11 is formed on the inner peripheral surface of the cylindrical body 1. Note that it is desirable that at least a part of the reinforcing member 5 is provided in close contact with the outer peripheral surface corresponding to the position where the fixing member 3 is fixed. This is to effectively reduce the magnitude of the axial stress at the open end of the cylindrical body 1 and suppress the deformation of the open end of the cylindrical body 1. Note that the reinforcing member 5 may be provided on a part of the outer peripheral surface corresponding to the position where the thread 11 is formed, as shown in FIG. 2, or may be provided on the entire outer peripheral surface (not shown).

[0029] As an example, the reinforcing member 5 is made of, for example, low alloy steel, which is the same as the material of the cylindrical body 1. Note that the reinforcing member 5 is not limited to low alloy steel, and other materials such as carbon fiber may be used as long as they have the strength to be adhered to the outer peripheral surface of the cylindrical body 1 for reinforcement. The carbon fiber is not particularly limited, and for example, any of PAN-based, pitch-based, etc. can be used.

[0030] The reinforcing member 5 is closely fixed by fitting the hollow interior into the outer peripheral surface of the cylindrical body 1. Note that if the inner peripheral surface of the reinforcing member 5 can be brought into close contact with the outer peripheral surface of the cylindrical body 1, it may be attached to the cylindrical body 1 by other means. For example, by welding the reinforcing member 5 to the outer peripheral surface of the cylindrical body 1, the adhesion between the inner peripheral surface of the reinforcing member 5 and the outer peripheral surface of the cylindrical body 1 can be enhanced. Also, an uneven fitting structure may be provided between the inner peripheral surface of the reinforcing member 5 and the outer peripheral surface of the cylindrical body 1.

[0031] It is desirable that the wall thickness of the reinforcing member 5 be equal to or greater than the wall thickness of the cylindrical body 1. As an example, when the wall thickness of the cylindrical body 1 is 40 mm as described above, the wall thickness of the reinforcing member 5 is set to 40 mm or more. Further, it is desirable that the length of the reinforcing member 5 in the pipe axis direction X be at least half of the length of the fixing member 3 in the pipe axis direction X. As an example, when the length of the fixing member 3 in the pipe axis direction X is 100 mm as described above, the length of the reinforcing member 5 in the pipe axis direction X is set to 50 mm or more. This is to effectively reduce the magnitude of the axial stress at the opening end of the cylindrical body 1 and suppress the deformation of the opening end of the cylindrical body 1.

[0032] However, the wall thickness of the reinforcing member 5 may be made smaller than the wall thickness of the cylindrical body 1 in consideration of, for example, the material of the reinforcing member 5, the inner diameter dimension of the cylindrical body 1, the dimensions of the fixing member 3, etc., and is determined by appropriately adjusting in consideration of the relationship with other members. Also, the length of the reinforcing member 5 in the pipe axis direction X may be made shorter than half of the length of the fixing member 3 in the pipe axis direction X in consideration of, for example, the material of the reinforcing member 5, the inner diameter dimension of the cylindrical body 1, the dimensions of the fixing member 3, etc., and is determined by appropriately adjusting in consideration of the relationship with other members.

[0033] Note that, as shown in Fig. 2, it is desirable that at least a part of the reinforcing member 5 is arranged between the center P in the pipe axis direction X of the fixing member 3 and the opening end face of the cylindrical body 1. In the reinforcing member 5 shown in Fig. 2, all parts are arranged between the center P in the pipe axis direction X of the fixing member 3 and the opening end face of the cylindrical body 1. By arranging the reinforcing member 5 between the center P in the pipe axis direction X of the fixing member 3 and the opening end face of the cylindrical body 1, the magnitude of the axial stress at the opening end of the cylindrical body 1 can be effectively reduced. However, the reinforcing member 5 may be arranged on the lid body 2 side from the center P in the pipe axis direction X of the fixing member 3. Even in this case, the effect can be exerted. Further, it is sufficient that the reinforcing member 5 is provided on the outer peripheral surface corresponding to the position where the thread 11 on the inner peripheral surface of the cylindrical body 1 is formed, but there is no problem even if a part of it is arranged on the outer peripheral surface corresponding to the position where the lid body 2 is provided. However, even if the reinforcing member 5 exists on the lid body 2, the stress reduction effect is not much, and it is not preferable from the viewpoint of cost. Also, the end face of the reinforcing member 5 is preferably within 20 mm from the end face of the cylindrical body 1, and more preferably the same.

[0034] Fig. 7 is a cross-sectional view schematically showing a modified example of the high-pressure hydrogen container 100 according to the embodiment. As shown in Fig. 7, when the opening end of the cylindrical body 1 extends beyond the position where the fixing member 3 is attached, the reinforcing member 5 may be provided on the outer peripheral surface of the cylindrical body 1 of the extending portion 1a, or a part of the reinforcing member 5 may be located on the outer peripheral surface of the cylindrical body 1 corresponding to the position of the fixing member 3.

[0035] Fig. 8 is an explanatory view of the high-pressure hydrogen container 100 according to the embodiment, in which the magnitude of the axial stress at the opening end of the cylindrical body 1 is obtained by FEM analysis. As shown in Fig. 8, when the axial stress acting on the high-pressure hydrogen container 100 according to the present embodiment is obtained by FEM analysis, the axial stress that occurred most greatly at the M portion at the inner end of the fixing member 3 was 492 MPa, and it was found that the durability of the container satisfies the allowable range. This is a reduction from 989 MPa to 492 MPa compared with the case of Fig. 4, and the effectiveness of providing the reinforcing member 5 was confirmed.

[0036] FIG. 9 is a diagram showing the relationship between the position of the reinforcing member 5 and the axial stress. In FIG. 9, the case where the reinforcing member 5 is arranged on the outer circumferential side of the lid body 2 in the circumferential direction is taken as (1). In FIG. 9, the case where the reinforcing member 5 is axially outside (1) and is arranged up to the center P in the pipe axis direction X of the fixing member 3 is taken as (2). In FIG. 9, the case where the reinforcing member 5 is arranged from the center P in the pipe axis direction X of the fixing member 3 to the pipe axis direction end face of the cylindrical body 1 is taken as (3). Note that the calculated value of the axial stress (MPa) is for the case where an internal pressure of 82 MPa is applied. As shown in FIG. 9, when there is no reinforcing member 5, the axial stress is 989 MPa. On the other hand, when the reinforcing member 5 is in (1), the axial stress is 975 MPa. When the reinforcing member 5 is in (2), the axial stress is 850 MPa. In contrast, when the reinforcing member 5 is in (3), the axial stress is 492 MPa, which is significantly reduced. Thus, when the reinforcing member 5 is arranged from the center P in the pipe axis direction X of the fixing member 3 to the pipe axis direction opening end face of the cylindrical body 1, the axial stress can be further reduced. Note that the right end of the arrangement position of the reinforcing member 5 in (3) of FIG. 9 is acceptable as long as it is within ±20 mm to the left and right of the right end of the cylindrical body 1. Also, the left end of the arrangement position of the reinforcing member 5 in (3) of FIG. 9 is acceptable as long as it is within ±5 mm of the center P.

[0037] In the high-pressure hydrogen container 100 of the present embodiment, a space is formed between the inside of the cylindrical body 1 and the pipe axis direction end face of the lid body 2. That is, the pipe axis direction end face of the lid body 2 has a planar shape and there are no protruding portions or the like. For this reason, it is sufficient if the reinforcing member 5 is provided on the pipe axis direction end face of the cylindrical body 1, and even if it is not provided up to the outer circumferential side of the lid body 2 in the circumferential direction, the magnitude of the axial stress can be sufficiently reduced.

[0038] The high-pressure hydrogen container 100 according to this embodiment has a thread 11 for screwing and fastening the fixing member 3 formed on the inner peripheral surface of the cylindrical body 1, and a ring-shaped reinforcing member 5 is provided in close contact with the outer peripheral surface of the cylindrical body 1 corresponding to the position where the thread 11 is formed. By doing so, it is possible to suppress a situation in which the opening end portion of the cylindrical body 1 deforms so as to expand outward due to the internal pressure of the high-pressure hydrogen stored in the storage space 10. Therefore, by increasing the inner diameter of the cylindrical body 1, reducing the wall thickness of the cylindrical body 1, and shortening the length of the fixing member 3 in the pipe axis direction X, it is possible to realize an increase in the capacity of the high-pressure hydrogen container 100. And by reducing the wall thickness of the cylindrical body 1 and shortening the length of the fixing member 3 in the pipe axis direction X, an increase in manufacturing cost and weight can be suppressed.

[0039] As described above, the high-pressure hydrogen container 100 has been described based on the embodiment. However, the high-pressure hydrogen container 100 is not limited to the configuration of the above-described embodiment. The configuration of the high-pressure hydrogen container 100 described above is an example, and it may include other components or some components may be omitted. For example, the carbon fiber reinforced resin layer 4 provided on the outer peripheral surface of the cylindrical body 1 of the high-pressure hydrogen container 100 may be omitted. In short, the high-pressure hydrogen container 100 includes the scope of design changes and application variations that those skilled in the art usually make without departing from its technical idea.

[0040] Hereinafter, various aspects of the present disclosure will be collectively described as appendices.

[0041] (Appendix 1) A cylindrical body for storing high-pressure hydrogen in an internal storage space, A lid body that is fitted into the inside from the opening end portion of the cylindrical body, closes the opening end portion of the cylindrical body, and has a space formed between the inner side of the cylindrical body and the end face in the pipe axis direction, A fixing member that is fitted into the inside from the opening end portion of the cylindrical body and whose outer peripheral surface is screwed and fastened to the inner peripheral surface of the cylindrical body, and supports and fixes the lid body from the outside, In the cylindrical body, A thread for screwing and fastening the fixing member is formed on the inner peripheral surface, A high-pressure hydrogen container, wherein a ring-shaped reinforcing member is provided in close contact with at least a part of the outer peripheral surface corresponding to the position where the thread is formed. (Appendix 2) The reinforcing member is The high-pressure hydrogen container according to Appendix 1, which is arranged on the end face side in the tube axis direction of the cylinder body rather than on the outer circumferential side in the circumferential direction of the lid body. (Appendix 3) The reinforcing member is The high-pressure hydrogen container according to Appendix 1, which is arranged on the end face side in the tube axis direction of the cylinder body from the center in the tube axis direction of the fixing member. (Appendix 4) The high-pressure hydrogen container according to any one of Appendices 1 to 3, further comprising a carbon fiber reinforced resin layer provided on the outer peripheral surface of the cylinder body. (Appendix 5) The high-pressure hydrogen container according to any one of Appendices 1 to 4, wherein the fixing member is a ground nut having a thread formed on the outer peripheral surface. (Appendix 6) The high-pressure hydrogen container according to any one of Appendices 1 to 5, wherein at least a part of the reinforcing member is provided in close contact with the outer peripheral surface corresponding to the position where the fixing member is fixed. (Appendix 7) The high-pressure hydrogen container according to any one of Appendices 1 to 6, wherein the reinforcing member is fixed by fitting the hollow interior into the outer peripheral surface of the cylinder body. (Appendix 8) The high-pressure hydrogen container according to Appendix 7, wherein the reinforcing member is welded to the outer peripheral surface of the cylinder body. (Appendix 9) The high-pressure hydrogen container according to any one of Appendices 1 to 8, wherein the reinforcing member is formed of low alloy steel or carbon fiber. (Appendix 10) The high-pressure hydrogen container according to any one of Appendices 1 to 9, wherein the wall thickness of the reinforcing member is equal to or greater than the wall thickness of the cylinder body. (Appendix 11) The high-pressure hydrogen container according to any one of Appendices 1 to 10, wherein the length of the reinforcing member in the tube axis direction is equal to or greater than half of the length of the fixing member in the tube axis direction.

Explanation of Reference Numerals

[0042] 1 Cylinder body, 1a Extension part, 2 Cover body, 3 Fixing member, 4 Carbon fiber reinforced resin layer, 5 Reinforcing member, 10 Storage space, 11 Thread, 12 Relief part, 13 Sealing surface, 30 Thread, 100 High-pressure hydrogen container, a Cylinder body, b Flange, c Bolt joint, d First cover body, e Second cover body.

Claims

1. a cylindrical body for storing high-pressure hydrogen in an internal storage space; a lid body that is fitted into the inside from the open end of the cylindrical body, closes the open end of the cylindrical body, and has a space formed between the inside of the cylindrical body and the end face in the tube axis direction; a fixing member that is fitted into the inside from the open end of the cylindrical body and has an outer peripheral surface screwed and fastened to the inner peripheral surface of the cylindrical body, and supports and fixes the lid body from the outside; and in the cylindrical body, a thread for screwing and fastening the fixing member is formed on the inner peripheral surface, A high-pressure hydrogen container, wherein a ring-shaped reinforcing member is provided in close contact with at least a part of the outer peripheral surface corresponding to the position where the thread is formed.

2. The reinforcing member is The high-pressure hydrogen container according to claim 1, wherein the high-pressure hydrogen container is disposed on the tube axis direction end face side of the cylindrical body rather than on the circumferential direction outer side of the lid body.

3. The reinforcing member is The high-pressure hydrogen container according to claim 1, wherein the high-pressure hydrogen container is disposed on the tube axis direction end face side of the cylindrical body from the center in the tube axis direction of the fixing member.

4. The high-pressure hydrogen container according to any one of claims 1 to 3, further comprising a carbon fiber reinforced resin layer provided on the outer peripheral surface of the cylindrical body.

5. The high-pressure hydrogen container according to any one of claims 1 to 3, wherein the fixing member is a ground nut having a thread formed on an outer peripheral surface.

6. The high-pressure hydrogen container according to any one of claims 1 to 3, wherein at least a part of the reinforcing member is provided in close contact with the outer peripheral surface corresponding to the position where the fixing member is fixed.

7. The high-pressure hydrogen container according to any one of claims 1 to 3, wherein the reinforcing member is fixed by fitting a hollow inside into the outer peripheral surface of the cylindrical body.

8. The high-pressure hydrogen container according to claim 7, wherein the reinforcing member is welded to the outer peripheral surface of the cylindrical body.

9. The high-pressure hydrogen container according to any one of claims 1 to 3, wherein the reinforcing member is formed of low alloy steel or carbon fiber.

10. The high-pressure hydrogen container according to any one of claims 1 to 3, wherein a wall thickness of the reinforcing member is equal to or greater than a wall thickness of the cylindrical body.

11. The high-pressure hydrogen container according to any one of claims 1 to 3, wherein a length of the reinforcing member in the tube axis direction is equal to or greater than a half of a length of the fixing member in the tube axis direction.

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