JP7754070B2 - gas bottle - Google Patents

Description

The present invention relates to a gas container for storing and releasing gases such as hydrogen gas.

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

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.

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 nozzle.

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, thereby sealing the gap between the resin liner and the nozzle with the moved nozzle mounting portion.

JP 2019-14069 A

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.

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.

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

Therefore, there is a need for technology that can stably seal between a film container part and a nozzle in a gas container that uses a film container part.

The present invention was made in consideration of the above circumstances, and aims to provide a gas container that has a film container portion and can stably seal between the film container portion and the mouthpiece.

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.

The gas container of the present invention has a film container portion and can provide a stable seal between the film container portion and the nozzle.

FIG. 1 is an explanatory diagram for schematically explaining a gas container according to a first embodiment. FIG. 2 is an explanatory diagram illustrating a schematic exploded view of the gas container according to the first embodiment. 1 is an explanatory diagram schematically illustrating an axial cross section of a gas container according to a first embodiment. FIG. FIG. 4 is an enlarged view of a main part of FIG. 3 . FIG. 10 is an explanatory diagram illustrating a schematic exploded view of the gas container according to the second embodiment. FIG. 10 is an explanatory diagram schematically illustrating an axial cross section of a gas container according to a second embodiment. FIG. 7 is an enlarged view of a main part of FIG. 6;

The gas container of the present invention has a film container portion made of a gas barrier resin with an internal space, and stores the fill gas in this internal space.

The film container section has an opening, and a nozzle is attached to the opening, connecting the exterior of the film container section with the interior space. Furthermore, the film container section is covered from the outside by a reinforcing part.

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

The gas container of the present invention further includes a pressing member interposed between the reinforcing portion and the film container portion. This pressing member is more rigid than the annular seal member and the film container portion, and is positioned facing the annular seal member. As a result, this pressing member presses the film container portion toward the annular seal member, and ultimately serves to stably press the film container portion and the annular seal member toward the nozzle.

In other words, 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.

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.

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.

There are no particular limitations on the type of fill gas contained in the gas container of the present invention, and there are also no particular limitations on the pressure of the fill gas within the gas container. However, the gas container of the present invention is particularly suitable for use as a pressure-resistant container filled with flammable gases such as hydrogen gas and natural gas at high pressure.

The gas container of the present invention has a film container portion, a nozzle, an annular sealing member, a pressing member, and a reinforcing portion.

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 portion refers to a polymer that has so-called gas barrier properties, i.e., that is difficult for the filled gas to permeate. Specifically, the oxygen permeability coefficient (cc20 μm/( ^m2 ·24 hr·atm)) of the gas barrier resin at 20°C is preferably 5 or less, 3 or less, 1 or less, 0.5 or less, or 0.3 or less. The oxygen permeability coefficient refers to the amount of oxygen that permeates the gas barrier resin with a thickness of 20 μm and a film area of 1 ^m2 at 1 atmosphere per 24 hours.

Ethylene-vinyl alcohol polymer (EVOH), which has excellent gas barrier properties, is particularly suitable as the gas barrier resin.

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

The storage material need only be able to absorb and release the fill gas, and the storage material may be selected appropriately depending on the type of fill gas to be stored in the gas container of the present invention.

For example, when the fill 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.

Storage materials can take on a variety of shapes. To fully utilize the storage material's ability to absorb 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 storage materials made of primary and/or secondary particles with a large specific surface area. Note that the primary and secondary particles are not limited in shape, and the storage material may be in the form of short or long fibers.

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.

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

There are no particular restrictions on the shape of the pellets, but considering that the film container portion will be supported from the inside as described above, it is particularly preferable for the shape to conform to the storage space in which the pellets will be stored.

If the gas container of the present invention has a shaft member, as described below, the pellets of storage material should be shaped to fit the storage space and avoid the shaft member.

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 preferred. 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 1 mm to 10 mm.

The film container portion may have an internal space and may be molded as a single unit, or may be made up of two or more separate pieces joined together. There are no particular restrictions on the method for joining the separate pieces, and any common joining method, such as gluing or welding, may be selected as appropriate depending on the intended use of the gas container.

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.

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.

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.

The reinforcing section may be made of high-strength fiber impregnated with resin (so-called FRP), similar to general pressure-resistant vessels. Examples of high-strength fiber include carbon fiber, glass fiber, and aramid fiber, and the resin impregnated into the high-strength fiber may be a thermosetting resin such as epoxy resin, unsaturated polyester resin, or vinyl ester resin.

Any conventional method can be used to form the reinforcing portion. For example, a method can be used in which high-strength fibers impregnated with a resin material are wound around the film container portion to form a helical layer or hoop layer, and then the resin material is heated and cured. Alternatively, a helical layer or hoop layer made from resin and high-strength fibers, formed into a sheet, can be attached to the film container portion, and then the resin material can be heated and cured.

The timing for forming the reinforcing section is preferably after the nozzle, described below, has been attached to the film container section, and after the annular sealing member and pressing member have been attached. In this way, the tension applied to the high-strength fiber when forming the reinforcing section can press the film container section radially inward, i.e., toward the nozzle. The pressing force from the reinforcing section then elastically deforms the annular sealing member between the film container section and the nozzle, and this elastic restoring force can improve the sealing between the film container section and the nozzle.

Furthermore, when the gas container of the present invention contains a storage material, it is preferable to form the reinforcing portion while the storage material is housed in the film container portion. This allows the thin film container portion to be supported from the inside by the storage material, while the pressing force from the reinforcing portion can be applied to the film container portion, elastic seal portion, and mouthpiece, making it possible to further improve the sealing ability between the film container portion and mouthpiece and to stably seal the film container portion and mouthpiece.

As mentioned above, the nozzle connects the internal space of the film container section with the outside of the film container section, and functions as an inlet and outlet for the filled gas.

The material of the nozzle is also not particularly limited, but the nozzle is required to have higher rigidity than the film container portion. For this reason, it is particularly preferable to select a metal material such as aluminum, an aluminum alloy, or stainless steel as the material for the nozzle.

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.

The shape of the annular seal groove must satisfy the above requirements and be capable of accommodating the annular seal member and allowing the annular seal member to perform its sealing function. Specifically, it is preferable that the groove depth of the annular seal groove be shallower than the height of the annular seal member (in other words, the axial length of the annular seal member).

If necessary, the nozzle may be provided with a retaining groove to accommodate the retaining member described below. The shape of the retaining groove will be described in detail later.

The annular seal member inserted into the annular seal groove is positioned between the nozzle and the film container portion, and functions to seal them. The material for the annular seal member can be selected from an elastically deformable material, such as rubber. Specifically, various types of rubber, such as ethylene propylene rubber (EPDM), and other elastomers are preferred.

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 sealing member and serves to press the film container portion and the annular sealing member toward the nozzle. For this reason, the presser member is required to have higher rigidity than the annular sealing member and the film container portion.

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 engaging structure that allows the holding member and mouthpiece to engage with each other. More specifically, it is preferable to provide a threaded groove on the holding member and a threaded groove on the mouthpiece that screws into the threaded groove on the holding member. Other methods that may be used include bolting, gluing, welding, etc.

Even if the pressing member is not fixed to the nozzle, the pressing force from the reinforcing portion described above presses the pressing member toward the nozzle. Therefore, even in this case, the pressing member can press the film container portion and the annular seal member toward the nozzle.

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.

The shape of the retaining groove is not particularly limited as long as it satisfies the above requirements. For example, the groove wall of the retaining groove may have a generally L-shaped cross section, with an inner surface extending along the axial direction of the nozzle and a bottom surface that continues radially outward from the inner surface and extends in that radial direction. Also, for example, the groove wall of the retaining groove may have a generally U-shaped cross section, with an outer surface that continues radially outward from the bottom surface and extends in the axial direction of the nozzle, in addition to the inner surface and bottom surface.

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

Therefore, it is preferable that the portion of the retaining groove that is radially outward from the bottom surface has a shape that allows the film container part to easily fit into it; specifically, that it be gently inclined relative to the bottom surface, or that there be no portion radially outward from the bottom surface.

More specifically, it is particularly preferred that the groove walls of the retaining groove have an approximately L-shaped cross section, with the aforementioned inner and bottom surfaces, and no outer surface, or that they have an approximately U-shaped cross section, with the aforementioned inner, bottom, and outer surfaces, and the angle between the outer surface and the bottom surface is 60° or less.

The gas container of the present invention will be explained below using specific examples.

Example 1
The gas container of Example 1 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 schematically illustrating the gas container of Example 1. Fig. 2 is an explanatory diagram schematically illustrating the exploded state of the gas container of Example 1. Fig. 3 is an explanatory diagram schematically illustrating 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 the radial direction refer to the directions shown in the drawings. The axial tip side and the axial center side refer to the axial tip side and the axial center side shown in FIG.

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.

The film container portion 2 is made of EVOH with a thickness of 130 μm and is roughly cylindrical with a reduced diameter at both axial ends.

As shown in Figures 2 and 3, the film container portion 2 is generally cylindrical with a bottom, and as shown in Figure 3, an internal space 29 is formed inside the film container portion 2.

The film container section 2 has dome-shaped ends in the axial direction, with an opening in the center. A metal nozzle 3 is attached to this opening 22.

More specifically, an annular seal groove 30 extending around the entire circumferential direction of the nozzle 3 is provided on the surface of the nozzle 3 at the axial tip end. The annular seal groove 30 opens toward the axial tip end.

A further axially distal portion of the nozzle 3 than the annular seal groove 30 is provided with a retaining groove 35 that extends around the entire circumference of the nozzle 3. The retaining groove 35 is a ring-shaped groove that is slightly wider than the annular seal groove 30.

As shown in Figures 3 and 4, the annular seal groove 30 and the retaining 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 (shown in Figure 4) of the groove wall of the retaining groove 35, and opens to this bottom surface 35b.

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 and extends radially, and an outer surface 35o that continues radially outward from the bottom surface 35b 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.

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 at the axially leading end of the annular seal groove 30, i.e., on the retaining groove 35 side.

A holding member 7 is fitted into the holding groove 35. The holding member 7 is made of the same material as the nozzle 3.

As shown in Figure 4, the retaining member 7 has a generally annular shape corresponding to the retaining groove 35, and its inner peripheral surface 7i is provided with a thread groove. The inner surface 35i of the retaining groove 35 also has a thread groove corresponding to the thread groove. The retaining member 7 is fixed to the ferrule 3 by fitting the retaining member 7 into the retaining groove 35 while threading the thread grooves together.

The axially leading end of the retaining member 7 is provided with an insertion recess 79 extending in the axial direction. An attachment jig (not shown) is inserted into the insertion recess 79, and by rotating the insertion jig in the circumferential direction of the retaining member 7, the retaining member 7 is rotated in the circumferential direction, and the retaining member 7 can be fitted into the retaining groove 35 while threading the threaded grooves together.

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

The pressing member 7 is fitted into the pressing groove 35 into which the film container portion 2 is inserted. Therefore, the film container portion 2 is sandwiched between the pressing member 7 and the annular sealing member 8. The annular sealing member 8 is also interposed between the nozzle 3 and the film container portion 2.

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 a plurality of through-holes (not shown) that connect the inside and outside of the shaft members 6.

A corresponding storage material 5 is inserted through each shaft member 6 .
2, the two storage materials 5 are pellet-shaped and have substantially the same shape. Specifically, the outer shape of each storage material 5 is a shape that conforms to the internal space 29 of the film container portion 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.

The two shaft members 6, through which the storage material 5 is inserted, fit together, fixing the two nozzles 3 relative to one another. This allows the shape of the gas container 1 of Example 1 to be stably maintained.

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 portion 2 is covered from the outside by a reinforcing portion 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 portion 4, pressing member 7, film container portion 2, annular sealing member 8, and mouthpiece 3.

The method for manufacturing the gas container 1 of Example 1 is described below.

First, a shaft member 6 was attached to each nozzle 3, and the shaft member 6 was inserted into the storage material 5. The two shaft members 6 were then fitted together, and the annular seal member 8 was then inserted into the annular seal groove 30 of the nozzle 3. This resulted in an integrated assembly consisting of the nozzle 3, shaft member 6, storage material 5, and annular seal member 8.

A cylindrical container member (not shown) that constitutes the cylindrical film container portion 2 was injection molded using EVOH. The container member was then placed over the integrated product and heated to thermally shrink the container member. This resulted in a film container portion 2 shaped to fit the storage material 5 and nozzle 3.

The peripheral edge of the opening 22 of the film container portion 2 was inserted into the retaining groove 35 of the nozzle 3, and the retaining member 7 was fitted into the retaining groove 35. This fixed the retaining member 7 to the nozzle 3 while sandwiching the film container portion 2 between the retaining member 7, the nozzle 3, and the annular sealing member 8.

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, a reinforcing portion 4 made of FRP was formed on the outside of the film container portion 2 and nozzle 3 to obtain the gas container 1 of Example 1.

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

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

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.

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.

Figure 5 is an explanatory diagram illustrating a disassembled view of the gas container 1 of Example 2. Figure 6 is an explanatory diagram illustrating a schematic axial cross section of the gas container 1 of Example 2. Figure 7 is an enlarged view of the main part of Figure 6.

As shown in Figures 5 to 7, the holding member 7 of the gas container 1 of Example 2 is generally dome-shaped, with a diameter that decreases axially toward the tip. A thread groove is provided on the inner peripheral surface of the holding member 7.

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 that radial direction; it does not have an outer surface 35o and has a generally L-shaped cross section.

In the gas container 1 of Example 2, the peripheral edge of the opening 22 in the film container portion 2 also fits into the retaining groove 35.

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 buckle or deform inside the holding groove 35. Therefore, the gas container 1 of Example 2 can be easily manufactured. Furthermore, by suppressing 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.

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.

1: Gas container 2: Film container portion 22: Opening 29: Internal space 3: Cap 30: Annular seal groove 35: Pressing groove 35i: Inner surface 35b: Bottom surface 4: Reinforcing portion 5: Storage material 7: Pressing member 8: Annular seal member

Claims (6)

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. 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. The gas container according to claim 1 or claim 2, further comprising a storage material housed in the internal space that absorbs and releases the fill gas. A gas container as described in claim 1 or claim 2, wherein the pressing member and the nozzle engage with each other. 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. The gas container of claim 5, wherein the groove wall of the retaining groove has an L-shaped cross section, with 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.