gas bottle

Abstract

To provide a gas vessel that has a film vessel part and can stably seal a clearance between the film vessel part and a mouthpiece.SOLUTION: A gas vessel includes: a film vessel part 2 made of gas-barrier resin and having an internal space; a reinforcing part 4 covering the film vessel part 2 from the outside; a mouthpiece 3 which has higher rigidity than the film vessel part 2, is attached to an opening 22 formed in the film vessel part 2 to provide communication between the internal space and the outside, and has an annular seal groove 30 extending in its circumferential direction in a surface of on the side the film vessel part 2; an annular sealing member 8 embedded in the annular seal groove 30 and interposed between the mouthpiece 3 and the film vessel part 2; and a pressing member 7 which has higher rigidity than the annular sealing member 8 and the film vessel part 2, is interposed between the reinforcing part 4 and the film vessel part 2, faces the annular seal member 8, and presses the film vessel part 2 toward the annular sealing member 8 and the mouthpiece 3.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a gas container for storing and releasing a gas, such as hydrogen gas. [Background technology]

[0002] In recent years, technologies have been proposed for using hydrogen gas, natural gas, etc. as fuel for vehicles and various devices. Gas containers for storing and releasing these gases have also been actively studied (see, for example, Patent Document 1).

[0003] As described in Patent Document 1, a typical gas container has a resin liner with an internal space and a nozzle that is more rigid than the resin liner and is attached to an opening in the resin liner. The nozzle connects the internal space of the resin liner with the outside, and gas is introduced into and extracted from the internal space through the nozzle.

[0004] In this type of gas container, it is important to prevent the gas stored in the internal space from leaking to the outside through the gap between the resin liner and the mouthpiece.

[0005] Patent Document 1 introduces a technology in which the nozzle mounting portion of the resin liner, to which the nozzle is attached, is pressed toward the flange portion of the nozzle under heat, and the moved nozzle mounting portion seals the space between the resin liner and the nozzle. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2019-14069 Summary of the Invention [Problem to be solved by the invention]

[0007] In recent years, reducing the weight of gas containers has become an issue. For example, in the case of a gas container for a vehicle that is mounted on a vehicle and stores fuel gas, it is thought that by reducing the weight, it is possible to improve the fuel efficiency of the vehicle.

[0008] In order to reduce the weight of a gas container, it is considered effective to replace the resin liner, which has a large mass, with a lighter one. In order to replace the resin liner with a lightweight one, it is conceivable to use a thin film made of gas barrier resin (referred to as a film container portion in this specification) to separate and form the above-mentioned storage space instead of the resin liner.

[0009] Here, the film container part is thinner than a general resin liner, and the gas barrier resin used for the film container part has different physical properties from the polyethylene resin, polypropylene resin, etc. used in general resin liners. For this reason, if the same sealing method as for a general resin liner is applied to the film container part, it becomes difficult to achieve a stable seal between the film container part and the nozzle. If the seal between the film container part and the nozzle is insufficient, there is a risk that the gas stored in the internal space will leak to the outside through the gap between the film container part and the nozzle.

[0010] Therefore, there is a demand for a technology that can stably seal between a film container part and a mouthpiece in a gas container that uses a film container part.

[0011] The present invention has been made in view of the above circumstances, and has an object to provide a gas container that has a film container part and that can stably seal between the film container part and the mouthpiece. [Means for solving the problem]

[0012] The gas container of the present invention that solves the above problems comprises: a film container portion made of a gas barrier resin and having an internal space; a reinforcing portion that covers the film container portion from the outside; a nozzle having higher rigidity than the film container portion, attached to an opening provided in the film container portion to connect the internal space with the outside, and having an annular seal groove extending in the circumferential direction on its surface facing the film container portion; an annular seal member fitted into the annular seal groove and interposed between the mouthpiece and the film container portion; The gas container has a pressing member that is more rigid than the annular sealing member and the film container portion, is interposed between the reinforcing portion and the film container portion, faces the annular sealing member, and presses the film container portion toward the annular sealing member and the nozzle. [Effects of the Invention]

[0013] The gas container of the present invention has a film container part, and can stably seal between the film container part and the mouthpiece. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is an explanatory diagram for schematically explaining a gas container according to a first embodiment. [Figure 2] FIG. 2 is an explanatory diagram for explaining a schematic exploded view of the gas container of the first embodiment. [Figure 3] 1 is an explanatory view schematically illustrating an axial cross section of a gas container according to a first embodiment. [Figure 4] FIG. 4 is an enlarged view of a main part of FIG. 3. [Figure 5] FIG. 10 is an explanatory diagram for explaining a schematic exploded view of the gas container of Example 2. [Figure 6] 10 is an explanatory view schematically illustrating an axial cross section of a gas container according to a second embodiment. FIG. [Figure 7] FIG. 7 is an enlarged view of a main part of FIG. 6. DETAILED DESCRIPTION OF THE INVENTION

[0015] The gas container of the present invention has a film container portion made of a gas barrier resin having an internal space, and stores a fill gas in the internal space.

[0016] The film container has an opening, and a mouthpiece is attached to the opening to connect the exterior of the film container to the interior space. Furthermore, the film container is covered from the outside by a reinforcing part.

[0017] The nozzle of the gas container of the present invention has an annular seal groove extending circumferentially of the nozzle on its surface facing the film container portion. Further, an annular seal member is fitted into the annular seal groove. Therefore, in the gas container of the present invention, the annular seal member is interposed between the nozzle and the film container portion.

[0018] In the gas container of the present invention, a pressing member is further interposed between the reinforcing portion and the film container portion. The pressing member has higher rigidity than the annular seal member and the film container portion and is positioned facing the annular seal member. Therefore, the pressing member presses the film container portion toward the annular seal member, and thereby serves to stably press the film container portion and the annular seal member against the nozzle.

[0019] That is, in the gas container of the present invention, the components are arranged in the following order from the exterior toward the interior space: reinforcing portion, pressing member, film container portion, annular sealing member, and mouthpiece.

[0020] A pressing member is interposed between the reinforcing portion and the film container portion, and the pressing member presses the annular seal member against the nozzle via the film container portion. The annular seal member is interposed between the film container portion and the nozzle, sealing them together. In this way, in the gas container of the present invention, cooperation between the pressing member and the annular sealing member makes it possible to stably seal between the film container portion and the mouthpiece.

[0021] The gas container of the present invention will be described below in detail with respect to each of its constituent elements. Unless otherwise specified, the numerical ranges "x to y" described in this specification include the lower limit x and the upper limit y. These upper and lower limit values, as well as the numerical values ​​listed in the examples, can be arbitrarily combined to form new numerical ranges. Furthermore, any numerical value selected from any of the above numerical ranges can be used as the upper and lower limit values ​​of a new numerical range. In the following description, unless otherwise specified, the axial direction, radial direction, and circumferential direction refer to the axial direction, radial direction, and circumferential direction of the nozzle.

[0022] There are no particular limitations on the type of filler gas contained in the gas container of the present invention, and there are also no particular limitations on the pressure of the filler gas inside the gas container, but the gas container of the present invention is particularly suitable for realizing as a so-called pressure-resistant container filled with flammable gases such as hydrogen gas and natural gas at high pressure.

[0023] The gas container of the present invention comprises a film container portion, a mouthpiece, an annular sealing member, a pressing member, and a reinforcing portion.

[0024] The film container portion has an internal space for containing the target filler gas. Because this film container portion is in direct contact with the filler gas, it is made of a gas barrier resin. The gas barrier resin used in the film container means a polymer that is difficult for the filled gas to permeate, i.e., has gas barrier properties. Specifically, the oxygen permeability coefficient (cc / μm / (m 2 The oxygen permeability coefficient (O2 / 24 hrs atm) at 20°C is preferably 5 or less, 3 or less, 1 or less, 0.5 or less, or 0.3 or less. 2 This refers to the amount of oxygen that permeates the gas barrier resin at 1 atmosphere per 24 hours.

[0025] As the gas barrier resin, it is particularly preferable to use ethylene-vinyl alcohol polymer (EVOH), which has excellent gas barrier properties.

[0026] The internal space of the film container portion of the gas container of the present invention may contain a storage material that stores and releases the filled gas.

[0027] The storage material may be selected appropriately as long as it can absorb and release the fill gas, depending on the type of fill gas to be stored in the gas container of the present invention.

[0028] For example, when the filling gas is hydrogen, the storage material is preferably a porous carbon material such as vapor-grown carbon fiber (so-called carbon nanotube), carbon black, activated carbon, etc. It is also preferable to use, as the storage material, such a porous carbon material that has been activated with an alkali salt such as KOH, NaOH, or LiOH under an inert gas atmosphere. In addition, it is also suitable to use porous metal complexes (so-called MOFs), zeolites, hydrogen storage alloys, metal hydrides, etc. as storage materials.

[0029] The storage material can have various shapes. In order to fully utilize the storage material's ability to store and release charged gas, it is preferable to increase the contact area of ​​the storage material with the charged gas, and it is preferable to use a storage material made of primary particles and / or secondary particles with a large specific surface area. Note that the primary particles and secondary particles are not limited in shape, and the storage material may be in the form of short fibers or long fibers.

[0030] When the gas container of the present invention has a storage material, the thin film container portion can be supported from the inside by the storage material, which can contribute to improving the sealing between the nozzle and the film container portion and improving the durability of the film container portion.

[0031] Considering the ease of handling of the storage material and thus the gas container of the present invention, it is preferable to crosslink the storage material of primary particles and / or secondary particles with a crosslinking agent or bind them with a binder to form them into pellets.

[0032] The shape of the pellet is not particularly limited, but considering that the film container part is supported from the inside as described above, it is particularly preferable that the shape of the pellet conforms to the storage space in which the pellet is stored.

[0033] In addition, when the gas container of the present invention has a shaft member described later, the pellets of the storage material may have a shape that conforms to the storage space and avoids the shaft member.

[0034] The thickness of the film container part is not particularly limited, but a thinner thickness is preferable to achieve a lighter gas container. Examples of suitable thicknesses of the film container part include 600 mm or less or 400 μm or less, with a thickness in the range of 6 μm to 600 μm or 6 μm to 400 μm being particularly suitable. Note that the thickness of the film container part in this specification refers to the thickness of the part of the film container part other than the peripheral edge part of the opening described below, in other words, the thickness of the thinnest part of the part of the film container part extending in its axial direction. For reference, the thickness of a typical resin liner is about 1mm to 10mm.

[0035] The film container part may have an internal space, and may be integrally molded as a whole, or may be formed by joining two or more separate parts together. The method for joining the separate parts is not particularly limited, and may be appropriately selected from common joining methods such as adhesion and welding depending on the intended use of the gas container.

[0036] Here, the film container portion has an opening for attaching a nozzle as described above. If the gas container of the present invention is a pressure-resistant container, the opening is preferably provided at one end or both ends in the axial direction of the film container portion, and further, it is preferable that the film container portion has a symmetrical shape on both ends in the axial direction. The shape of the film container is not particularly limited, but considering the above, it is preferable that the film container be a bottomed or bottomless tubular shape that can form an internal space and has an opening. In addition, it is particularly preferable that the film container have a shape that can uniformly distribute the internal pressure caused by the filled gas, such as a cylindrical shape or a regular polygonal cylindrical shape.

[0037] The film container portion may be integrally formed with the nozzle, which will be described later, or may be formed separately from the nozzle. For example, the film container part may be insert-molded using a pre-formed nozzle as an insert. Alternatively, the nozzle may be attached to the film container part by inserting the nozzle into the pre-formed film container part. The same applies to the separate parts described above.

[0038] The gas container of the present invention has a reinforcing part. The reinforcing part is a part that covers the film container part of the gas container from the outside, and the gas container of the present invention having the reinforcing part is suitably used as a pressure-resistant container. In order to reinforce the film container portion, the reinforcing portion is preferably more rigid than the film container portion, and the thickness of the reinforcing portion is preferably thicker than the thickness of the film container portion at least at the axial tip end.

[0039] The reinforcing portion may be made of high-strength fiber-reinforced plastic (FRP), similar to general pressure vessels. Examples of high-strength fiber include carbon fiber, glass fiber, and aramid fiber. Examples of resins impregnated into the high-strength fiber include thermosetting resins such as epoxy resin, unsaturated polyester resin, and vinyl ester resin.

[0040] The reinforcing portion may be formed by any conventional method, such as by winding high-strength fibers impregnated with a resin material around the film container to form a helical layer or hoop layer, and then heat-curing the resin material. Alternatively, the helical layer or hoop layer made of resin and high-strength fibers may be formed into a sheet shape and attached to the film container, and then heat-curing the resin material.

[0041] The timing for forming the reinforcing portion is preferably after the nozzle, described below, is attached to the film container portion and the annular sealing member and pressing member are further attached. By doing so, the tension applied to the high-strength fiber when forming the reinforcing portion can press the film container portion radially inward, i.e., toward the nozzle. The pressing force from the reinforcing portion elastically deforms the annular sealing member between the film container portion and the nozzle, and the resulting elastic restoring force can improve the sealing between the film container portion and the nozzle.

[0042] Furthermore, when the gas container of the present invention has a storage material, it is preferable to form the reinforcing part while the storage material is housed in the film container part. In this way, the thin film container part is supported from the inside by the storage material, and the pressing force from the reinforcing part can be applied to the film container part, the elastic sealing part, and the mouthpiece, making it possible to further improve the sealing property between the film container part and the mouthpiece and to stably seal the film container part and the mouthpiece.

[0043] As described above, the mouthpiece connects the internal space of the film container portion with the outside of the film container portion, and functions as an inlet and outlet for the filled gas.

[0044] The material of the mouthpiece is not particularly limited, but since the mouthpiece is required to have higher rigidity than the film container portion, it is particularly preferable to select a metal material such as aluminum, an aluminum alloy, or stainless steel as the material for the mouthpiece.

[0045] The mouthpiece has an annular seal groove into which an annular seal member is fitted. The annular seal groove has an annular shape extending in the circumferential direction of the mouthpiece, and is provided on the surface of the mouthpiece on the film container portion side. In other words, the annular seal groove can be said to open to the surface of the mouthpiece on the side of the film container portion.

[0046] The shape of the annular seal groove may be any shape that satisfies the above requirements and is capable of accommodating the annular seal member and allowing the annular seal member to perform its sealing function. Specifically, the groove depth of the annular seal groove is preferably shallower than the height of the annular seal member (in other words, the axial length of the annular seal member).

[0047] The nozzle may be provided with a holding groove for accommodating a holding member, which will be described later, as necessary. The shape of the holding groove will be described in detail later.

[0048] The annular seal member fitted into the annular seal groove is interposed between the mouthpiece and the film container portion and serves to seal them. The material of the annular seal member may be an elastic material that can be elastically deformed, such as rubber, and specifically, various types of rubber such as ethylene propylene rubber (EPDM) or other elastomers can be preferably used.

[0049] The gas container of the present invention further includes a presser member. The presser member is a member interposed between the reinforcing portion and the film container portion, and as described above, faces the annular seal member and serves to press the film container portion and the annular seal member toward the nozzle. For this reason, the presser member is required to have higher rigidity than the annular seal member and the film container portion.

[0050] The holding member may or may not be fixed to the mouthpiece. A suitable method for fixing the holding member to the mouthpiece is, for example, to provide an engagement structure for the holding member and the mouthpiece to engage with each other. More specifically, it is preferable to provide a thread groove on the holding member and a thread groove on the mouthpiece to be threadedly engaged with the thread groove on the holding member. Other methods, such as bolting, adhesive bonding, or welding, may also be used.

[0051] Even when the presser member is not fixed to the nozzle, the presser member is pressed toward the nozzle by the pressing force from the reinforcing portion, so that the presser member can press the film container portion and the annular seal member toward the nozzle.

[0052] As mentioned above, the mouthpiece may be provided with a holding groove for accommodating the holding member. Because the holding member faces the annular seal member and is located between the reinforcing part and the film canister, the holding groove communicates with the annular seal groove that accommodates the annular seal member, and a portion of the film canister fits into the holding groove. Therefore, the holding groove is provided on the surface of the mouthpiece facing the film canister and opens to the surface facing the film canister. The pressing member may be entirely fitted into the pressing groove, or a part of it may be exposed on the reinforcing portion side.

[0053] The shape of the retaining groove is not particularly limited as long as it satisfies the above-mentioned requirements. For example, the groove wall of the retaining groove may have a generally L-shaped cross section, having an inner surface extending along the axial direction of the nozzle and a bottom surface continuing from the inner surface to the radially outer side of the nozzle and extending in the radial direction. Alternatively, the groove wall of the retaining groove may have a generally U-shaped cross section, having, in addition to the inner surface and bottom surface, an outer surface continuing from the bottom surface to the radially outer side of the nozzle and extending in the axial direction of the nozzle.

[0054] As mentioned above, a portion of the film canister fits into the retaining groove. Considering the functions of the film canister, the retaining member, and the annular seal member, it is preferable that the film canister extend from the radially outer end of the retaining groove to at least a position facing the annular seal member.

[0055] Therefore, it is preferable that the portion of the retaining groove that is radially outward from the bottom surface has a shape that makes it easy for the film container portion to fit into, specifically, that it is gently inclined from the bottom surface, or that there is no portion radially outward from the bottom surface.

[0056] More specifically, it is particularly preferable that the groove wall of the retaining groove has an approximately L-shaped cross section having the aforementioned inner surface and bottom surface and no outer surface, or that the groove wall has an approximately U-shaped cross section having the aforementioned inner surface, bottom surface and outer surface, and the angle between the outer surface and the bottom surface is 60° or less.

[0057] The gas container of the present invention will be described below by way of specific examples.

[0058] Example 1 The gas container of the first embodiment is a pressure-resistant container that is mounted on a vehicle and is used to store and release hydrogen gas, which is a type of fill gas. Fig. 1 is an explanatory diagram that schematically illustrates the gas container of Example 1. Fig. 2 is an explanatory diagram that schematically illustrates the exploded state of the gas container of Example 1. Fig. 3 is an explanatory diagram that schematically illustrates an axial cross section of the gas container of Example 1. Fig. 4 is an enlarged view of a main part of Fig. 3. Hereinafter, the axial direction and radial direction refer to the directions shown in each drawing. Also, the axial tip side and axial center side refer to the axial tip side and axial center side shown in FIG.

[0059] As shown in Figures 1 to 3, the gas container 1 of Example 1 has a film container portion 2, two nozzles 3, a reinforcing portion 4, two storage materials 5, two annular sealing members 8, two pressing members 7, and two shaft members 6.

[0060] The film container part 2 is made of EVOH with a thickness of 130 μm, and has a substantially cylindrical shape with both axial ends tapered in diameter.

[0061] As shown in FIGS. 2 and 3, the film container part 2 has a substantially cylindrical shape with a bottom, and as shown in FIG. 3, an internal space 29 is formed inside the film container part 2.

[0062] Both axial ends of the film container 2 are dome-shaped, and the center portion is open. A metal mouthpiece 3 is attached to the opening 22.

[0063] More specifically, an annular seal groove 30 extending over the entire circumferential direction of the mouthpiece 3 is provided on the surface of the mouthpiece 3 on the axial tip side. The annular seal groove 30 opens toward the axial tip side.

[0064] A holding groove 35 extending over the entire circumferential direction of the nozzle 3 is further provided in a portion of the nozzle 3 further axially forward than the annular seal groove 30. The holding groove 35 is in the form of a ring groove that is slightly wider than the annular seal groove 30.

[0065] 3 and 4, the annular seal groove 30 and the pressure groove 35 form a double groove that communicates with each other in the axial direction. In other words, the annular seal groove 30 is provided on the bottom surface 35b of the groove wall of the pressure groove 35 shown in FIG. 4, and opens to the bottom surface 35b.

[0066] The groove wall of the holding groove 35 has an approximately U-shaped cross section, having an inner surface 35i extending along the axial direction of the nozzle 3, a bottom surface 35b that continues radially outward from the inner surface 35i of the nozzle 3 and extends in the radial direction, and an outer surface 35o that continues radially outward from the bottom surface 35b of the nozzle 3 and extends along the axial direction of the nozzle 3. The groove wall of the annular seal groove 30 also has a similar generally U-shaped cross section.

[0067] An annular seal member 8 is fitted into the annular seal groove 30. The annular seal member 8 is made of EPDM and is an annular elastic body. The annular seal member 8 is a so-called O-ring. In its natural, uncompressed state, the axially leading end of the annular seal member 8 is exposed to the axially leading side of the annular seal groove 30, i.e., the pressing groove 35 side.

[0068] A pressing member 7 is fitted into the pressing groove 35. The pressing member 7 is made of the same material as the mouthpiece 3.

[0069] 4, the holding member 7 has a generally annular shape corresponding to the holding groove 35, and has a thread groove formed on its inner peripheral surface 7i. A thread groove corresponding to the thread groove is also formed on the inner surface 35i of the holding groove 35. The holding member 7 is fixed to the mouthpiece 3 by fitting the holding member 7 into the holding groove 35 while threading the thread grooves together.

[0070] An insertion recess 79 extending in the axial direction is provided at the axial tip end of the holding member 7. An attachment jig (not shown) is inserted into the insertion recess 79, and by rotating the insertion jig in the circumferential direction of the holding member 7, the holding member 7 is rotated in the circumferential direction, and the holding member 7 can be fitted into the holding groove 35 while the thread grooves are screwed together.

[0071] The peripheral edge of the opening 22 in the film canister 2 fits into the retaining groove 35. Specifically, the film canister 2 covers the outer surface 35o and bottom surface 35b of the retaining groove 35.

[0072] The pressing member 7 is fitted into the pressing groove 35 into which the film canister 2 is inserted. Therefore, the film canister 2 is sandwiched between the pressing member 7 and the annular sealing member 8. The annular sealing member 8 is also interposed between the mouthpiece 3 and the film canister 2.

[0073] As shown in FIGS. 2 and 3, a shaft member 6 is attached to each of the two nozzles 3. The two shaft members 6 extend from the nozzle 3 toward the center in the axial direction and are fitted together at their ends. The shaft members 6 are cylindrical, and the interior of the shaft members 6 serves as a gas flow passage that connects to the interior of the nozzle 3. Each shaft member 6 is made of the same metal as the nozzle 3, and has multiple through holes (not shown) that connect the inside and outside of the shaft members 6.

[0074] A corresponding storage material 5 is inserted through each shaft member 6 . 2, the two storage materials 5 are pellet-shaped and have approximately the same shape. Specifically, the outer shape of each storage material 5 is a shape that follows the shape of the internal space 29 of the film container part 2. Each storage material 5 has a hollow portion 51 shaped to follow the outer shape of the corresponding shaft member 6. Therefore, each storage material 5 has a substantially cylindrical shape.

[0075] The shaft members 6, through which the storage materials 5 are inserted, are fitted together, thereby fixing the two nozzles 3 relative to each other, thereby stably maintaining the shape of the gas container 1 of the first embodiment.

[0076] The storage material 5 and the shaft member 6 are housed in the internal space 29 of the film canister portion 2. A portion of the mouthpiece 3 is also housed in the internal space 29 of the film canister portion 2. The film container part 2 is covered from the outside by a reinforcing part 4 made of FPR. Therefore, the components constituting the gas container 1 are arranged in the following order from the outside toward the internal space 29: reinforcing part 4, pressing member 7, film container part 2, annular sealing member 8, and mouthpiece 3.

[0077] A method for manufacturing the gas container 1 of the first embodiment will be described below.

[0078] First, a shaft member 6 was attached to each nozzle 3, and the shaft member 6 was inserted into the storage material 5. Then, the two shaft members 6 were fitted together, and further, an annular seal member 8 was fitted into the annular seal groove 30 of the nozzle 3. In this way, an integrated product consisting of the nozzle 3, shaft member 6, storage material 5, and annular seal member 8 was obtained.

[0079] A cylindrical container member (not shown) that constitutes the cylindrical film container portion 2 was injection molded using EVOH. The container member was then fitted onto the integrated product and heated to cause thermal shrinkage of the container member. This resulted in a film container portion 2 that conformed to the shape of the storage material 5 and the nozzle 3.

[0080] The peripheral edge of the opening 22 of the film container part 2 was inserted into the holding groove 35 of the mouthpiece 3, and the holding member 7 was fitted into the holding groove 35. In this way, the film container part 2 was sandwiched between the holding member 7, the mouthpiece 3, and the annular sealing member 8, and the holding member 7 was fixed to the mouthpiece 3.

[0081] Of the integrated component obtained as described above, consisting of the nozzle 3, shaft member 6, storage material 5, annular sealing member 8, film container portion 2 and pressing member 7, an FRP reinforcing portion 4 was formed on the outside of the film container portion 2 and nozzle 3 to obtain the gas container 1 of Example 1.

[0082] In the gas container 1 of Example 1, a storage material 5 is accommodated in the internal space 29 of the film container portion 2. The gas injected into the gas container 1 of Example 1 flows into the shaft member 6 through the nozzle 3, passes through a through-hole (not shown) of the shaft member 6, and advances to the internal space 29, where it is stored in the storage material 5 accommodated in the internal space 29.

[0083] In the gas container 1 of Example 1, an annular sealing member 8 is interposed between the mouthpiece 3 and the film container part 2. Furthermore, a pressing member 7 is interposed between the reinforcing part 4 and the film container part 2.

[0084] In the gas container 1 of Example 1, the pressing member 7 presses the film container portion 2 toward the annular sealing member 8, and thus stably presses the film container portion 2 and the annular sealing member 8 toward the nozzle 3, thereby stably sealing the space between the film container portion 2 and the nozzle 3 with the annular sealing member 8. In other words, the pressing member 7 has the function of keeping the surface pressure acting on the annular sealing member 8 constant, thereby enabling the annular sealing member 8 to achieve a stable seal between the film container portion 2 and the nozzle 3.

[0085] Example 2 The gas container 1 of Example 2 differs significantly from the gas container 1 of Example 1 in the shapes of the pressing member 7 and the pressing groove 35, but is otherwise substantially the same as the gas container 1 of Example 1. Therefore, the gas container 1 of Example 2 will be described below, focusing on the differences from Example 1.

[0086] Fig. 5 is an explanatory diagram illustrating a schematic exploded view of the gas container 1 of Example 2. Fig. 6 is an explanatory diagram illustrating a schematic axial cross section of the gas container 1 of Example 2. Fig. 7 is an enlarged view of a main part of Fig. 6.

[0087] 5 to 7, the holding member 7 of the gas container 1 of the second embodiment is substantially dome-shaped with a diameter that decreases toward the axial end. The holding member 7 has a thread groove on its inner peripheral surface.

[0088] The groove wall of the retaining groove 35 provided in the nozzle 3 has an inner surface 35i extending along the axial direction of the nozzle 3, and a bottom surface 35b that is continuous with the inner surface 35i radially outward of the nozzle 3 and extends in the radial direction, and has no outer surface 35o, forming a roughly L-shaped cross section.

[0089] In the gas container 1 of Example 2, the peripheral edge of the opening 22 in the film container part 2 also fits into the pressing groove 35 .

[0090] Here, the groove wall of the pressing groove 35 in the gas container 1 of the second embodiment has a substantially L-shaped cross section without an outer surface 35o. Therefore, the film container part 2 easily fits into the holding groove 35 and is less likely to deform, such as buckle, inside the holding groove 35. This makes it possible to easily manufacture the gas container 1 of Example 2. Furthermore, by being able to suppress deformation of the film container part 2 inside the holding groove 35, it is possible to further improve the sealing performance between the film container part 2 and the nozzle 3.

[0091] Although the present invention has been described above, the present invention is not limited to the above-described embodiments, etc., and it is possible to implement the present invention by appropriately extracting and combining elements described in the embodiments, etc., and to make various modifications within the scope that does not deviate from the spirit of the present invention. Furthermore, the specification of the present invention discloses not only the citation relationships of the claims at the time of filing but also the technical idea of ​​appropriately combining the matters described in the claims. [Explanation of symbols]

[0092] 1: Gas bottle 2: Film container part 22:Aperture 29: Interior space 3: Nozzle 30: Annular seal groove 35: Retaining groove 35i:Inner surface 35b: Bottom 4: Reinforcement section 5: Storage material 7: Pressing member 8: Annular seal member

Claims

1. a film container portion made of a gas barrier resin and having an internal space; a reinforcing portion that covers the film container portion from the outside; a nozzle having higher rigidity than the film container portion, attached to an opening provided in the film container portion to connect the internal space with the outside, and having an annular seal groove extending in the circumferential direction on its surface facing the film container portion; an annular seal member fitted into the annular seal groove and interposed between the mouthpiece and the film container portion; a pressing member that is more rigid than the annular sealing member and the film container portion, that is interposed between the reinforcing portion and the film container portion, and that faces the annular sealing member to press the film container portion toward the annular sealing member and the nozzle.

2. 2. The gas container according to claim 1, wherein the thickness of the film container portion is in the range of 6 μm to 600 μm.

3. 3. The gas container according to claim 1, further comprising a storage material accommodated in the internal space for absorbing and releasing the fill gas.

4. 3. The gas container according to claim 1, wherein the pressing member and the mouthpiece are engaged with each other.

5. the nozzle has a pressing groove extending in a circumferential direction thereof and communicating with the annular seal groove on a surface facing the film container portion, 3. The gas container according to claim 1, wherein at least a portion of the pressing member is fitted into the pressing groove.

6. 6. The gas container according to claim 5, wherein the groove wall of the retaining groove has an L-shaped cross section, the groove wall having an inner surface extending along the axial direction of the nozzle, and a bottom surface that is continuous with the inner surface radially outward of the nozzle and extends in the radial direction.

Images