JP5741482B2 - Pressure vessel and method for manufacturing the same - Google Patents

Description

  The present invention is a pressure for filling liquid hydrogen, various compressed gases such as CNG (compressed natural gas), various liquefied gases such as LNG (liquefied natural gas) and LPG (liquefied petroleum gas), and other various pressurized substances. The present invention relates to a container and a manufacturing method thereof.

  As a pressure vessel for filling various pressurized substances such as CNG, generally, a metal vessel part attached to a hollow container body and a valve attached to the die part are used. In general, the inner peripheral surface of the container body is made of a resin liner, and the outer periphery of the liner is made of a reinforcing portion made of high-strength resin (such as FRP). In general, an O-ring for sealing between the base part and the liner part is interposed at the boundary between the base part and the liner part (see, for example, Patent Documents 1 and 2).

  When sealing between the liner part and the base part by the O-ring as disclosed in Patent Documents 1 and 2, the liner part is formed separately from the base part and the O-ring, and the base part (or liner part) is formed. It is necessary to insert the base part into the liner part after mounting the O-ring on

  However, when the pressure vessel is manufactured in this way, when the base part is inserted, the base part pushes the O-ring and the O-ring is twisted or buckled (referred to as an O-ring mounting fault). there is a possibility. When an O-ring attachment failure occurs, a pressure vessel excellent in the sealability of the pressurized substance cannot be obtained, resulting in a production loss of the pressure vessel.

JP 2009-121624 A JP 2005-48919 A

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pressure vessel that can eliminate the mounting failure of the O-ring.

  The pressure vessel of the present invention that solves the above problems is a pressure vessel having a hollow vessel body having an opening and a base part that forms the periphery of the opening, and the inner circumferential surface of the vessel body is made of resin. The base portion includes a cylindrical boss portion, and a flange portion that is continuous with the boss portion and protrudes radially outward from the outer peripheral end portion of the boss portion. The boss portion has a base extending portion that extends further toward the inside of the container body than the bottom surface of the flange portion, and has a ring shape on the outer side in the radial direction of the base extending portion. A deformable seal reinforcing member is disposed, and the liner portion is formed integrally with the base portion and the seal reinforcing member, and a part of the liner portion covers a bottom surface of the flange portion, and the base extending portion Between the outer peripheral surface of the sealing member and the inner peripheral surface of the seal reinforcing member.

The pressure vessel of the present invention preferably includes any one of the following (1) to (3), and more preferably includes a plurality.
(1) The seal reinforcing member has an endless ring shape.
(2) A seal interposed between the bottom surface of the flange portion and the top surface of the liner portion facing the bottom surface and / or between the outer peripheral surface of the base extension portion and the inner peripheral surface of the liner portion. The liner portion is formed integrally with the seal layer, the base portion, and the seal reinforcing member.
(3) The seal reinforcing member extends in the extending direction of the base extending portion and is in surface contact with the liner portion.

  The pressure vessel manufacturing method of the present invention that solves the above problems is a method of manufacturing the above-described pressure vessel of the present invention, wherein the liner portion is molded with a molding die on which the base portion and the seal reinforcing member are placed. An insert molding step, and in the insert molding step, when the base and the seal reinforcing member are placed on the mold surface of the molding die, an outer peripheral surface of the base extension portion and an inner periphery of the seal reinforcing member A mold outer surface of the mold that is separated from at least a part of the surface and faces the outer peripheral surface of the seal reinforcing member and an outer peripheral surface of the seal reinforcing member are spaced apart from each other in the radial direction of the base extending portion. The molding material for molding the liner portion is injected into the molding die on which the base portion and the sealing reinforcement member are placed, and the seal is supplemented by injection pressure. A method to elastically deform the member in the diameter direction.

The pressure vessel manufacturing method of the present invention preferably includes the following (4).
(4) A seal layer forming step of coating the seal layer on the base portion before the insert molding step is provided.

  The pressure vessel of the present invention does not seal between the base portion and the liner portion with an O-ring unlike the conventional pressure vessel, but forms the base portion, the liner portion, and the seal reinforcing member integrally. The seal reinforcement member integrated on the outside of the part presses between the base part and the liner part from the outside. For this reason, unlike the conventional pressure vessel which inserts a base part and an O-ring into a preformed liner part, it is not necessary to insert a seal reinforcing member and a base part into the liner part. Therefore, according to the pressure vessel of the present invention, the O-ring is not required, and the mounting failure of the O-ring does not occur. Therefore, according to the pressure vessel of the present invention, the liner part, the seal reinforcing member, and the base part can be easily attached to each other in the correct position and in the correct shape, and the sealing performance between the liner part and the base part is improved.

  In the pressure vessel of the present invention having the above (1), since the seal reinforcing member is hardly deformed, the sealing performance between the liner portion and the base portion is further improved.

  The pressure vessel of the present invention comprising the above (2) is provided between the bottom surface of the flange portion and the top surface of the liner portion facing the bottom surface, and / or the outer peripheral surface of the base extension portion and the inner peripheral surface of the liner portion. The space can be sealed with a sealing layer. For this reason, according to the pressure vessel of this invention provided with said (2), the sealing performance of a liner part and a nozzle | cap | die part further improves.

  By the way, for example, when the pressure vessel is filled with liquid hydrogen, it may be necessary to suppress the leakage amount of the pressurized substance from the inside of the pressure vessel to the outside at a minimum. At this time, if the liner part cannot block the pressurized substance, the pressurized substance that has passed through the liner part may enter between the liner part and the base part and leak out of the pressure vessel.

  For example, when the gap between the liner portion and the base extension portion is sealed with a general O-ring, the gap is sealed linearly. In this case, the O-ring is sandwiched between the inner peripheral surface of the liner portion and the outer peripheral surface of the base extension portion to seal the pressurized substance. For this reason, the surfaces of the three parties (that is, the O-ring, the liner portion, and the base extension portion) must each be sufficiently smooth. For this reason, it is necessary to set the position of the O-ring particularly in consideration of the state of the inner peripheral surface of the resin liner. Furthermore, since the liner portion is made of resin, it is necessary to consider reinforcement.

  On the other hand, in the pressure vessel of the present invention having the above (3), the seal reinforcing member extends in the extending direction of the base extending part (that is, the axial direction of the base extending part). For this reason, the liner portion and the base extension portion are face-sealed by the axial length of the seal reinforcing member. Therefore, the seal layer formed on the outer peripheral surface of the liner part, the base extension part, and the base extension part is strongly compressed by the seal reinforcing part, and a gap is formed between the liner part and the base extension part. hard. For this reason, the leakage of the pressurized substance to the inside and outside of the pressure vessel along the boundary portion between the base portion and the liner portion can be suppressed. Therefore, the pressure vessel of the present invention provided with the above (3) has excellent sealing properties between the liner part and the base part, and can cope with various pressurized substances.

  The method of manufacturing a pressure vessel according to the present invention includes elastically deforming a seal reinforcing member in a diameter-enlarging direction by injection pressure in a step of insert-molding a liner portion (insert molding step) with a mold on which a base portion and a seal reinforcing member are placed. Let Since the elastically deformed seal reinforcing member tries to return to the original shape, the liner portion is pressed toward the base portion. Therefore, according to the pressure vessel manufacturing method of the present invention, it is possible to easily manufacture the pressure vessel of the present invention having excellent sealing properties between the cap portion and the liner portion. Further, as described above, since the step of inserting the O-ring and the base part into the liner part is not required, there is no problem of mounting the O-ring. Furthermore, the tightening force by the seal reinforcing member can be generated with high reliability. For this reason, according to the manufacturing method of this invention, the pressure vessel excellent in the sealing performance of a nozzle | cap | die part and a liner part can be manufactured easily.

  According to the manufacturing method of the present invention including the above (4), the seal layer can improve the sealing performance between the liner part and the base part, and the seal layer can be reinforced by the base part by forming the seal layer on the base part. The deformation of the seal layer when molding the liner portion can be suppressed. For this reason, the pressure vessel which is excellent in the sealing performance of a cap part and a liner part can be manufactured easily. In addition, as a sealing layer in the pressure vessel of this invention, you may use what was shape | molded separately from the liner part. In this case, the liner part may be insert-molded with a seal layer formed in advance and integrated with the base part by a method such as vulcanization adhesion. Alternatively, the seal layer may be rigidly selected by appropriately selecting the material and shape of the seal layer, and the liner portion may be insert-molded using the base portion, the seal reinforcing member, and the seal layer as inserts.

  Hereinafter, a pressure vessel and a manufacturing method thereof according to the present invention will be described with reference to the drawings.

It is sectional drawing which represents typically a mode that the pressure vessel of Example 1 was cut | disconnected in the axial direction. It is a principal part enlarged view of FIG. It is sectional drawing which represents typically a mode that the nozzle | cap | die part in the pressure vessel of Example 1, the seal | sticker reinforcement member, and the sealing layer were cut | disconnected in the axial direction. It is explanatory drawing which represents typically the insert molding process in the manufacturing method of the pressure vessel of Example 1. FIG. It is explanatory drawing which represents typically the insert molding process in the manufacturing method of the pressure vessel of Example 1. FIG. It is explanatory drawing which represents typically the insert molding process in the manufacturing method of the pressure vessel of Example 1. FIG. It is explanatory drawing which represents typically the insert molding process in the manufacturing method of the pressure vessel of Example 1. FIG. It is explanatory drawing which represents typically the insert molding process in the manufacturing method of the pressure vessel of Example 1. FIG. It is explanatory drawing which represents typically the insert molding process in the manufacturing method of the pressure vessel of Example 1. FIG.

Hereinafter, the pressure vessel of the present invention will be described with specific examples.
Example 1
The pressure vessel of Example 1 is a fuel tank for automobiles, and includes the above (1) to (3). The manufacturing method of the pressure vessel of Example 1 includes the above (4). Cross-sectional views schematically showing the pressure vessel of Example 1 are shown in FIGS. 1 to 3, and explanatory views schematically showing the method for manufacturing the pressure vessel of Example 1 are shown in FIGS. Specifically, FIG. 1 is a cross-sectional view schematically showing a state where the pressure vessel of Example 1 is cut in the axial direction. 2 is an enlarged view of a main part of FIG. 1, and more specifically, FIG. 2 shows a base part, a seal reinforcing member, a seal layer, and a liner part and a reinforcing part located in the vicinity of the base of the pressure vessel shown in FIG. Represents. FIG. 3 is a cross-sectional view schematically illustrating a state in which the base portion, the seal reinforcing member, and the seal layer in the pressure vessel of Example 1 are cut in the axial direction. FIG. 4 schematically shows an insert molding step in the method for manufacturing a pressure vessel of Example 1, and more specifically, a molding die used in the insert molding step, a die portion in the molding die, a seal reinforcing portion, and a seal layer. Is schematically represented. FIG. 5 shows a state where the molding material is injected into the molding die shown in FIG. FIG. 6 shows a state in which the injection pressure acts on the seal reinforcing member. FIG. 7 shows a state where the seal reinforcing member is deformed by the injection pressure. 8 and 9 show the seal reinforcing member after the molding material is injected. Hereinafter, in Example 1, “upper” and “lower” refer to the upper and lower sides shown in FIG. The axial direction is the same as the vertical direction shown in FIG.

  The pressure container of Example 1 has a container body 1, a base part 2, a seal reinforcing member 3, and a seal layer 4. The container main body 1 has a cylindrical shape (hollow shape) with two ends in the axial direction (vertical direction in FIG. 1) opened and reduced in diameter. The container body 1 has a reinforcing part 10 and a liner part 11. The liner portion 11 is made of EVOH (ethylene-vinyl alcohol copolymer resin) having excellent gas barrier properties. The reinforcing portion 10 is made of FRP containing carbon fibers and an epoxy resin, and is wound around the outer periphery of the liner portion 11. That is, the liner portion 11 covers the inner peripheral surface of the reinforcing portion 10.

  Openings 15 are respectively formed at two axial ends of the container body 1. The base portion 2 is integrated with each of the two openings 15. The base part 2 is made of metal and has a boss part 20 and a flange part 21. The boss 20 has a cylindrical shape. In the inner peripheral surface of the boss portion 20, an unillustrated screw groove is formed in a portion of the container body 1 on the outer side in the axial direction (upper side in FIG. 1). The flange portion 21 protrudes in the outer peripheral direction from a portion on the inner side in the axial direction in the outer peripheral surface of the boss portion 20. In the pressure vessel according to the first embodiment, the flange portion 21 has an annular shape that is continuous with the entire outer periphery of the boss portion 20. The base extension part 22 which is the lower part of the boss part 20 extends further to the lower side than the flange part 21. A valve (not shown) is detachably attached to one base part 2 (upper base part in FIG. 1). The other base part 2 (the lower base part in FIG. 2) is sealed by a plug member (not shown).

  The liner portion 11 is integrally formed with the base portion 2. The liner portion 11 includes a flange bottom seal portion 110, a flange upper surface seal portion 111, a boss seal portion 112, and a general portion 113. As shown in FIG. 2, the flange bottom seal portion 110 covers the bottom surface 210 of the flange portion 21. The flange upper surface seal portion 111 covers a part of the upper surface 211 of the flange portion 21 (the surface on the axially outer side in the flange portion 21, the upper surface in FIG. 1). The boss seal portion 112 covers the outer peripheral surface 220 of the base extension portion 22. The general part 113 is another part.

  The seal layer 4 is painted on the outer peripheral surface 220 of the base extension portion 22 and the bottom surface 210 of the flange portion 21. As the material of the seal layer 4, a silicone-based paint (manufactured by Momentive Performance Materials, TSR180) was used. The seal layer 4 has a thickness of about 80 μm.

  A seal reinforcing member 3 having an endless ring shape is disposed on the radially outer side (that is, the outer peripheral side) of the base extension portion 22 and the seal layer 4. Specifically, as shown in FIG. 3, the seal reinforcing member 3 includes an endless ring-shaped (short cylindrical shape) reinforcing main body 30 extending in the axial direction, and an endless ring-shaped lower portion of the reinforcing main body 30. And a reinforcing leg 31 integrated with the base, and is externally mounted on the base extension 22. The inner diameters of the reinforcing main body 30 and the reinforcing leg 31 are the same, and the outer diameter of the reinforcing leg 31 is larger than the outer diameter of the reinforcing main body 30. That is, the seal reinforcing member 3 has an L-shaped cross section. In the pressure vessel of Example 1, the axial length of the seal reinforcing member 3 is not less than 3/4 of the axial length of the base extension 22 and is slightly shorter than the axial length of the base extension 22. .

  The seal reinforcing member 3 is made of austenitic stainless steel (SUS 316L). SUS316L is known to hardly embrittle hydrogen, and is preferably used as a pressure vessel material using liquid hydrogen as a pressurized substance. Note that SUS 316L is a name according to the JIS standard and is substantially the same as 316L according to the ASTM standard.

  As shown in FIG. 2, the boss seal portion 112 that is a part of the liner portion 11 is integrated with the outer peripheral surface 300 of the seal reinforcing member 3, the inner peripheral surface 301 of the seal reinforcing member 3, and the outer peripheral surface 400 of the seal layer 4. Has been. A portion of the boss seal portion 112 that is located on the radially outer side (outer peripheral side) of the seal reinforcing member 3 is referred to as an outer boss seal portion 115. Further, a portion of the boss seal portion 112 that is located on the radially inner side (inner peripheral side) of the seal reinforcing member 3 is referred to as an inner boss seal portion 116.

  The pressure vessel of Example 1 is manufactured as follows.

  First, a silicone-based paint that is a material for the seal layer 4 is applied to the bottom surface 210 of the flange portion 21 in the base portion 2 and the outer peripheral surface 220 of the base extension portion 22, and heated at 130 ° C. for 2.5 hours. The seal layer 4 is formed by painting.

  The seal reinforcing member 3 is placed on the mold surface of the mold 5. Next, as shown in FIG. 3, the base extension part 22 of the base part 2 on which the seal layer 4 is formed is inserted inside the seal reinforcing member 3. Accordingly, as shown in FIG. 4, an integrated product of the seal layer 4, the base portion 2, and the seal reinforcing member 3 is placed on the mold surface of the mold 5. The mold surface 50 facing the seal reinforcing member 3 in the mold 5 has a tapered shape. For this reason, as shown in FIG. 6, the part located in the lower end of the reinforcement leg part 31 in the outer peripheral surface 300 of the seal reinforcement member 3 is contact | abutted to the type | mold surface 50, and the seal layer 4, the nozzle | cap | die part 2, and a seal reinforcement member 3 is positioned in the mold 5. At this time, most of the outer peripheral surface 300 of the seal reinforcing member 3 is separated from the mold surface 50. At this time, the inner peripheral surface 301 of the seal reinforcing member 3 is separated from the outer peripheral surface 400 of the seal layer 4 and the outer peripheral surface 220 of the base extension portion 22.

  As shown in FIG. 5, melted or softened EVOH (hereinafter simply referred to as molten resin) is injected into a mold 5 on which the seal layer 4, the base portion 2, and the seal reinforcing member 3 are placed, and the liner portion 11. Is molded. At this time, the molten resin is filled from the gate 51 of the mold 5 into the cavity 500 formed in the mold 5.

  By the way, as shown in FIG. 6, the inner peripheral surface 301 of the seal reinforcing member 3 and the outer peripheral surface 220 of the base extension 22 (in the first embodiment, the outer peripheral surface of the seal layer 4 formed on the outer peripheral surface 220). 400). Therefore, the molten resin is preferentially filled in the gap between the inner peripheral surface 301 of the seal reinforcing member 3 and the outer peripheral surface 400 of the seal layer 4. The molten resin filled in the gap presses the seal reinforcing member 3 radially outward as shown in FIG. As described above, most of the outer peripheral surface 300 of the seal reinforcing member 3 and the mold surface 50 of the mold 5 are separated from each other. Therefore, the diameter of the seal reinforcing member 3 can be increased by this gap. Further, the seal reinforcing member 3 can be elastically deformed. For this reason, the diameter of the seal reinforcing member 3 is elastically expanded by the pressing force of the molten resin that has entered between the base portion 2 and the seal reinforcing member 3, that is, the injection pressure at the time of insert molding.

  As shown in FIG. 8, after the injection, when the injection pressure acting on the seal reinforcing member 3 decreases, the seal reinforcing member 3 tries to return to its original shape due to its own elasticity. That is, the seal reinforcing member 3 tries to reduce the diameter. Therefore, as shown in FIGS. 7 and 8, the seal reinforcing member 3 presses the inner boss seal portion 116, the seal layer 4 and the base extension portion 22 inward in the radial direction. For this reason, the inner boss seal part 116 and the base extension part 22 are sealed with high sealing performance. Further, when the liner portion 11 shrinks after the molding, the inner boss seal portion 116 shrinks and comes into pressure contact with the base extending portion 22. Also by this, the inner boss seal part 116 and the base extension part 22 are sealed with high sealing performance. Similarly, the outer boss seal portion 115 is reduced in diameter and presses the seal reinforcing member 3, the inner boss seal portion 116, and the seal layer 4 against the base extension portion 22. Also by this, the inner boss seal part 116 and the base extension part 22 are sealed with high sealing performance.

  The seal reinforcing member 3 has a short cylindrical shape extending in the axial direction of the base extending portion 22. For this reason, the pressing force by the seal reinforcing member 3 acts continuously in the axial direction of the seal reinforcing member 3. For this reason, the inner boss seal part 116 and the base extension part 22 contact not only in the circumferential direction but also in the axial direction. That is, the inner boss seal part 116 and the base extension part 22 are in surface contact by the axial length of the seal reinforcing member 3 and are face-sealed. For this reason, in the pressure vessel of Example 1, it is difficult to form a gap between the liner portion 11 and the base extension portion 22 in the axial direction of the seal reinforcing member 3. That is, the pressure vessel of Example 1 can be suitably used as a pressure vessel for filling liquid hydrogen or the like.

  In the pressure vessel according to the embodiment, the boss seal portion 112 includes the inner boss seal portion 116 and the outer boss seal portion 115. Depending on the case, the outer boss seal 115 may not be provided.

  The wall thickness of the inner boss seal portion 116 is determined according to the thickness of the region in the cavity 500 where the inner boss seal portion 116 is formed. The thickness of this region is the distance between the inner peripheral surface 301 of the seal reinforcing member 3 and the outer peripheral surface 220 of the base extension 22 (when the seal layer 4 is formed on the outer peripheral surface of the base 2, the seal layer 4 To the outer peripheral surface 400). This distance may be any distance that can be filled with a molten resin that can elastically deform the seal reinforcing member 3 radially outward in the insert molding process. The injection pressure, the fluidity of the molten resin, the inner boss seal portion It can be set as appropriate according to the axial length of 116 or the like. Preferably, the distance between the inner peripheral surface of the seal reinforcing member 3 and the outer peripheral surface of the base portion 2 is 1 mm or more, and the thickness of the inner boss seal portion 116 is also 1 mm or more.

  The seal reinforcing member 3 may be made of an elastically deformable material, and the material is not particularly limited. However, considering that the tightening force in the diameter reducing direction is sufficiently large, it is preferable that the seal reinforcing member 3 has high rigidity, such as stainless steel. It is preferable to consist of these metals. The seal reinforcing member 3 may have a simple ring shape or a shape having a length in the axial direction (that is, a cylindrical shape), and the axial length is not particularly limited, but is cylindrical. Is preferred. The axial length of the seal reinforcing member 3 is preferably ½ or more of the axial length of the base extension 22 and more preferably ¾ or more. Further, the shape of the seal reinforcing member 3 is not limited to the shape of the first embodiment. For example, the seal reinforcing member 3 may be configured by only the reinforcing main body 30.

  The sealing layer 4 is not particularly limited as long as the adhesion (sealability) between the base portion 2 and the liner portion 11 can be sufficiently maintained, and the material and film thickness thereof are not particularly limited, but silicone (silicone resin), varnish, and the like are preferably used. It is done. The thickness of the seal layer 4 is preferably about 40 to 120 μm.

  The liner portion 11 in the pressure vessel of Example 1 is made of EVOH, but the material of the liner portion 11 in the pressure vessel of the present invention may be appropriately selected according to the pressurized substance to be filled. For example, PPS (polyphenylene sulfide), polyethylene, nylon, or the like is preferably used as the material of the liner portion 11.

  The reinforcing portion 10 in the pressure vessel of Example 1 is made of FRP containing carbon fiber and epoxy resin, but glass fiber or aramid fiber may be used instead of carbon fiber.

  The boss seal portion 112 in the pressure vessel of the first embodiment covers the entire axial direction of the outer peripheral surface 220 of the base extending portion 22, but it may only cover a part in the axial direction. That is, a part of the base extension part 22 may extend to a lower side than the boss seal part 112. Alternatively, the boss seal portion 112 may further cover the bottom surface 221 (the axial end surface, the lower end surface in FIG. 1) of the base extending portion 22.

  The pressure vessel of the present invention can be preferably used as a pressure vessel for filling various liquefied gases such as hydrogen gas, CNG, LNG, and LPG. It can be particularly preferably used as an on-vehicle pressure vessel.

1: Container body 2: Base part 3: Seal reinforcement member 4: Seal layer 5: Mold 10: Reinforcement part 11: Liner part 15: Opening part 20: Boss part 21: Flange part 22: Base extension part

Claims (6)

A pressure vessel having a hollow container body having an opening and a base part forming a periphery of the opening,
The inner peripheral surface of the container body is composed of a resin liner,
The base portion has a cylindrical boss portion, and a flange portion that is continuous with the boss portion and protrudes radially outward from the outer peripheral end portion of the boss portion,
The boss portion has a base extending portion that extends further toward the inside of the container body than the bottom surface of the flange portion,
A seal reinforcing member that is ring-shaped and elastically deformable is disposed on the radially outer side of the base extension portion,
The liner portion is formed integrally with the base portion and the seal reinforcing member,
A part of the liner portion covers the bottom surface of the flange portion, and is also interposed between the outer peripheral surface of the base extension portion and the inner peripheral surface of the seal reinforcing member ,
The seal reinforcing member is a pressure vessel that is elastically expanded by an injection pressure that fills a gap between an inner peripheral surface of the seal reinforcing member and an outer peripheral surface of the base extending portion with a molding material .   The pressure vessel according to claim 1, wherein the seal reinforcing member has an endless ring shape. It has a seal layer interposed between the bottom surface of the flange portion and the upper surface of the liner portion facing the bottom surface and / or between the outer peripheral surface of the base extension portion and the inner peripheral surface of the liner portion. ,
The pressure vessel according to claim 1 or 2, wherein the liner portion is formed integrally with the seal layer, the base portion, and the seal reinforcing member.   The pressure vessel according to any one of claims 1 to 3, wherein the seal reinforcing member extends in an extending direction of the base extending portion and is in surface contact with the liner portion. A method for producing the pressure vessel according to any one of claims 1 to 4,
An insert molding step of molding the liner portion with a molding die on which the base portion and the seal reinforcing member are placed;
In the insert molding process,
When placing the base and the seal reinforcing member on the mold surface of the mold, at least a part of the outer peripheral surface of the base extending portion and the inner peripheral surface of the seal reinforcing member is separated,
Arranging the seal reinforcing member on the radially outer side of the mouthpiece extension part while separating the mold surface of the mold facing the outer peripheral surface of the seal reinforcing member and the outer peripheral surface of the seal reinforcing member;
A molding material for molding the liner portion is injected into the molding die on which the base portion and the reinforcing portion are placed, and an inner peripheral surface of the seal reinforcing member and an outer peripheral surface of the base extending portion the gaps molding material preferentially fills the manufacturing method of the pressure vessel to elastically deform said sealing reinforcing member in the diameter direction by the injection pressure.   The manufacturing method of the pressure vessel of Claim 5 provided with the sealing layer formation process of coating-forming the said sealing layer in the said nozzle | cap | die part before the said insert molding process.

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