JP7359114B2 - High pressure tank manufacturing method and high pressure tank - Google Patents

Description

The present invention relates to a high-pressure tank that includes a liner that accommodates gas and a reinforcing layer made of fiber-reinforced resin that covers the outer surface of the liner, and a method for manufacturing the same.

2. Description of the Related Art Hitherto, as a high-pressure tank used for storing and supplying hydrogen or the like, a tank is known that includes a tank body and a cap attached to an open end in the longitudinal direction of the tank body. The tank body includes, for example, a liner for keeping hydrogen gas airtight, and a reinforcing layer whose outer surface is reinforced by wrapping a fiber bundle impregnated with resin.

As described above, a high-pressure tank including a liner, a reinforcing layer covering the outer surface of the liner, and a cap provided at an end of the reinforcing layer is disclosed in, for example, Patent Document 1. The high-pressure tank of Patent Document 1 includes a liner, a reinforcing layer made of fiber-reinforced resin that covers the outer surface of the liner, and a cap provided at an end of the reinforcing layer. The cap has a cylindrical protrusion having a gas flow path for filling and discharging hydrogen gas or the like.

Japanese Patent Application Publication No. 2018-179201

By the way, if an attempt is made to reduce the weight of a high-pressure tank from the perspective of transporting the tank or improving the fuel efficiency of vehicles equipped with a high-pressure tank, it is also assumed that the portion corresponding to the cap may be made of fiber-reinforced resin to reduce weight. be done.

In this case, for example, by winding a resin-impregnated fiber bundle around the outer surface of a liner or the like provided with a cylindrical protrusion having a gas flow path using a filament winding method, the part corresponding to the base is wound. It is conceivable to form a reinforcing layer having: However, the pressure inside the high-pressure tank is extremely high, and a large force is applied outward in the axial direction to the valve attached to the tip of the protrusion, so a large force is also applied to the protrusion itself in the outward direction in the axial direction. At this time, since the fiber bundle is spirally wound in the protrusion, it is difficult to ensure the tensile strength in the axial direction of the protrusion. For this reason, the protrusion may be damaged.

The present invention has been made in view of these points, and provides a high-pressure tank and a method for manufacturing the same, which can reduce the weight of the high-pressure tank while suppressing damage to the protrusion having a gas flow path. The challenge is to provide the following.

The method for manufacturing a high-pressure tank according to the present invention includes a liner that accommodates gas, and a reinforcing layer made of fiber-reinforced resin that covers the outer surface of the liner, and the reinforcing layer is provided on a cylindrical member and both ends of the cylindrical member. It is a layer in which two provided dome members are integrally formed, and one of the dome members includes a dome main body and a gas flow path protruding from the dome main body and for filling and discharging gas. a cylindrical protrusion having a cylindrical protrusion, the method includes the step of forming at least one of the dome members, the step of forming the at least one dome member includes the step of forming at least one of the dome members; arranging a first fiber bundle impregnated with a first resin so as to form a part of the dome body and a part of the dome main body; and arranging a second fiber bundle, in which the fiber direction in the protrusion is along the axial direction of the protrusion, and in the step of disposing the first fiber bundle, In the step of solidifying the first resin impregnated in the arranged first fiber bundle while arranging the first fiber bundle so as to continue to the dome main body part, and arranging the second fiber bundle, The second fiber bundle is arranged such that the fiber directions of the two fiber bundles intersect with the fiber direction of the first fiber bundle.

According to the method for manufacturing a high-pressure tank of the present invention, the first fiber bundle is arranged in the protrusion so that the fiber direction is along the axial direction of the protrusion. Thereby, the tensile strength of the protrusion in the axial direction can be ensured. Further, the first fiber bundle is arranged so as to be continuous from the protrusion to the dome main body, and the second fiber bundle is arranged so as to cover the first fiber bundle. Thereby, the second fiber bundle restrains the movement of the first fiber bundle, and it is possible to prevent the protrusion from slipping out from the dome main body. In addition, since the second fiber bundle is provided so that the fiber direction of the second fiber bundle intersects with the fiber direction of the first fiber bundle, it is possible to increase the tensile strength not only in the axial direction but also in other directions such as the radial direction. Strength can also be ensured. Therefore, even if the inside of the high-pressure tank becomes high pressure and a large force is applied to the protrusion outward in the axial direction, damage to the protrusion can be suppressed. Therefore, since there is no need to provide a cap, the weight of the high-pressure tank can be reduced.

In the method for manufacturing a high-pressure tank, preferably, the first resin is made of a thermoplastic resin, and the second resin is made of a thermosetting resin, and in the step of arranging the first fiber bundle, the first resin is made of a thermoplastic resin, and the second resin is made of a thermosetting resin. While arranging the first fiber bundle in a state where the resin is softened, the first resin impregnated into the arranged first fiber bundle is solidified, and in the step of arranging the second fiber bundle, the second resin is After the second fiber bundle is placed in an uncured state, the second resin is heated and cured. In this way, by using a thermoplastic resin as the first resin impregnated into the first fiber bundle, and placing the first fiber bundle on the surface of a mandrel or liner, for example, with the first resin softened, The heat of the first fiber bundle is absorbed by the mandrel or liner, and the resin impregnated into the first fiber bundle is solidified. As a result, the second fiber bundle is placed on the first fiber bundle in which the first resin is solidified. Therefore, when the second fiber bundle is arranged, the first fiber bundle does not bend or shift its position, so it is possible to suppress a decrease in the tensile strength of the protrusion in the axial direction. Further, by using a thermosetting resin as the second resin impregnated into the second fiber bundle, the mechanical strength of the protrusion after the second resin is cured can be easily improved.

In this case, preferably, when forming the two dome members, the surface of the dome member that comes into contact with the gas is formed from the first fiber bundle. Since thermoplastic resin has gas barrier properties, by forming the surface of the dome member that comes into contact with gas with the first fiber bundle impregnated with thermoplastic resin, the liner (the dome-shaped There is no need to provide both ends). This makes it possible to further reduce the weight of the high-pressure tank.

The high-pressure tank according to the present invention includes a liner that accommodates gas, and a reinforcing layer made of fiber-reinforced resin that covers the outer surface of the liner, and the reinforcing layer includes a cylindrical member and two layers provided at both ends of the cylindrical member. one of the dome members is a layer integrally formed with a dome body and a protrusion that protrudes from the dome body and has a gas flow path for filling and discharging gas; The dome main body and the protrusion are formed by a first fiber bundle impregnated with a first resin and a second fiber bundle impregnated with a second resin. , the first fiber bundle constitutes a part of the protrusion and a part of the dome main body, and the fiber direction in the protrusion is along the axial direction of the protrusion, and the first fiber bundle forms a part of the protrusion and the dome body. The second fiber bundle is arranged continuously up to the dome main body, and the second fiber bundle covers the first fiber bundle, and the fiber direction of the second fiber bundle intersects with the fiber direction of the first fiber bundle. It is arranged like this.

According to the high pressure tank of the present invention, the first fiber bundle is arranged in the protrusion so that the fiber direction is along the axial direction of the protrusion. Thereby, the tensile strength of the protrusion in the axial direction can be ensured. Moreover, the first fiber bundle is arranged so as to be continuous from the protrusion to the dome main body, and the second fiber bundle is arranged so as to cover the first fiber bundle. Thereby, the second fiber bundle restrains the movement of the first fiber bundle, and it is possible to prevent the protrusion from slipping out from the dome main body. In addition, since the second fiber bundle is provided so that the fiber direction of the second fiber bundle intersects with the fiber direction of the first fiber bundle, it is possible to increase the tensile strength not only in the axial direction but also in other directions such as the radial direction. Strength can also be ensured. Therefore, even if the inside of the high-pressure tank becomes high pressure and a large force is applied to the protrusion outward in the axial direction, damage to the protrusion can be suppressed. Therefore, since there is no need to provide a cap, the weight of the high-pressure tank can be reduced.

In the high-pressure tank, preferably, the first resin is made of a thermoplastic resin, the second resin is made of a thermosetting resin, and the surface of the dome member that comes into contact with the gas is made of the first fibers. It is formed by a bundle. Since thermoplastic resin has gas barrier properties, by forming the surface of the dome member that comes into contact with gas with the first fiber bundle impregnated with thermoplastic resin, the liner (the dome part of) is formed along the inner surface of the dome member. There is no need to provide This makes it possible to further reduce the weight of the high-pressure tank. Furthermore, by using a thermosetting resin as the second resin impregnated into the second fiber bundle, the mechanical strength of the protrusion can be easily improved.

Preferably, in the method for manufacturing a high-pressure tank, in the step of arranging the first fiber bundle, the first fiber bundle is arranged on the outer periphery of an insert having a female thread on the inner peripheral surface. As a result, the insert can be placed inside the protrusion of the dome member, and the valve having the male thread on the outer circumference can be screwed into the female thread on the inner circumference of the insert to attach the valve to the protrusion. With this configuration, even if the internal pressure of the high-pressure tank acts on the valve and a tensile force is applied to the protruding part in the axial direction of the high-pressure tank outward, stress concentration on specific parts can be avoided, and the liner Damage can be prevented. Note that the first fiber bundle is arranged on the outer periphery of the second fiber bundle arranged on the outer periphery of the insert, and the second fiber bundle is further arranged on the outer periphery of the second fiber bundle, so that the first fiber bundle can be arranged in an intermediate layer between the second fiber bundles. Good too. In this case, both surfaces of the first fiber bundle can be adhered to the second fiber bundle.

In the above-mentioned high-pressure tank, preferably, a cylindrical insert is disposed inside the protrusion, and the insert has a female thread on an inner circumferential surface. Thereby, the valve having the male thread on the outer peripheral surface can be screwed into the female thread on the inner peripheral surface of the insert, and the valve can be attached to the protrusion. With such a configuration, even if the internal pressure of the high-pressure tank acts on the valve and a tensile force is applied to the protrusion toward the outside in the axial direction of the high-pressure tank, stress concentration on specific parts can be avoided. Damage to the liner can be prevented.

According to the present invention, it is possible to provide a high-pressure tank and a method for manufacturing the same, which can reduce the weight of the high-pressure tank while suppressing damage to a protrusion having a gas flow path.

FIG. 1 is a cross-sectional view showing the structure of a high-pressure tank according to a first embodiment of the present invention. 1 is a flowchart showing a method for manufacturing a high-pressure tank according to a first embodiment of the present invention. It is a flowchart which shows the dome member formation process of the manufacturing method of the high pressure tank based on 1st Embodiment of this invention. It is a perspective view for explaining the dome member formation process of the manufacturing method of the high pressure tank concerning a 1st embodiment of the present invention. It is a sectional view for explaining a dome member formation process of a manufacturing method of a high pressure tank concerning a 1st embodiment of the present invention. It is a perspective view for explaining the modification of the dome member formation process of the manufacturing method of the high pressure tank based on 1st Embodiment of this invention. It is a perspective view for explaining the modification of the dome member formation process of the manufacturing method of the high pressure tank based on 1st Embodiment of this invention. It is a perspective view for explaining the cylindrical member formation process of the manufacturing method of the high pressure tank concerning a 1st embodiment of the present invention. FIG. 2 is a perspective view for explaining a joining process of the high-pressure tank manufacturing method according to the first embodiment of the present invention. FIG. 3 is a cross-sectional view for explaining a joining process of the high-pressure tank manufacturing method according to the first embodiment of the present invention. It is a figure for explaining the relationship between the fiber direction and the tensile strength of an axial direction in a protrusion part. FIG. 3 is a cross-sectional view showing the structure of a high-pressure tank according to a second embodiment of the present invention. It is a perspective view for demonstrating the dome member formation process of the manufacturing method of the high pressure tank based on 2nd Embodiment of this invention. It is a perspective view for explaining the dome member formation process of the manufacturing method of the high-pressure tank of the modification of this invention. It is a sectional view showing the structure of a high pressure tank concerning a 3rd embodiment of the present invention. It is a perspective view for demonstrating the dome member formation process of the manufacturing method of the high pressure tank based on 3rd Embodiment of this invention. FIG. 2 is a cross-sectional view showing an example of the structure of a conventional high-pressure tank. It is a top view showing an example of stress distribution of a conventional high pressure tank.

(First embodiment)
Hereinafter, a method for manufacturing the high pressure tank 10 according to the first embodiment of the present invention will be described with reference to the drawings, but before that, the configuration of the high pressure tank 10 will be briefly described. The high-pressure tank 10 will be described below as a tank filled with high-pressure hydrogen gas mounted on a fuel cell vehicle, but it can also be applied to other uses. Furthermore, the gas that can be filled into the high-pressure tank 10 is not limited to high-pressure hydrogen gas.

As shown in FIG. 1, the high-pressure tank 10 is a generally cylindrical high-pressure gas storage container with both ends rounded into a dome shape. The high-pressure tank 10 includes a liner 11 having gas barrier properties and a fiber-reinforced resin layer 12 made of fiber-reinforced resin and covering the outer surface of the liner 11. The fiber reinforced resin layer 12 includes a reinforcing body 20 as a reinforcing layer that covers the outer surface of the liner 11 and an outer reinforcing layer 13 that covers the outer surface of the reinforcing body 20. An opening is formed at one end of the high pressure tank 10. Note that the high-pressure tank 10 of this embodiment is not provided with a cap. Furthermore, no opening is formed at the other end of the high-pressure tank 10.

The liner 11 is formed along the inner surface of the reinforcement body 20. The liner 11 is a resin member that forms a housing space 17 filled with high-pressure hydrogen gas. The resin constituting the liner 11 is preferably a resin that has good performance in retaining the gas (here, hydrogen gas) to be filled in the accommodation space 17, that is, has good gas barrier properties. Examples of such resins include thermoplastic resins such as polyamide, polyethylene, ethylene-vinyl alcohol copolymer resin (EVOH), and polyester, and thermosetting resins such as epoxy. In addition to hydrogen gas, the liner 11 also contains 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 gases. may be filled.

The reinforcing body 20 covers the outer surface of the liner 11 and has the function of reinforcing the liner 11 and improving mechanical strength such as rigidity and pressure resistance of the high-pressure tank 10. As will be described later, the reinforcing body 20 includes a cylindrical tube member 21 and two dome members 22 and 23 connected to both ends of the tube member 21, and is a layer in which these are integrally formed. . In this embodiment, the dome member 22 is made up of a first resin layer 121 and a second resin layer 122 formed to cover the first resin layer 121, and the dome member 23 is made up of a third resin layer 121. 125.

Here, in this embodiment, the dome member 22 includes a dome main body part 22a and a cylindrical protrusion part 22b protruding from the dome main body part 22a. The protrusion 22b has a gas flow path 22c for filling and discharging hydrogen gas and the like. A metal valve fixture 14 is fixed to the outer peripheral surface of the protruding portion 22b, and a metal valve for filling and discharging hydrogen gas into and from the accommodation space 17 is fixed to the outer peripheral surface of the valve fixture 14. 15 is attached. A protrusion 14a for preventing the valve from coming off is formed on the inner surface of the valve fixture 14, and a screw thread 14b to which the valve 15 is attached is formed on the outer surface of the valve fixture 14. The valve fixture 14 is caulked and fixed to the outer peripheral surface of the protrusion 22b. A thread 15a that engages with the thread 14b of the valve fixture 14 is formed on the inner surface of the valve 15, and the valve 15 is fixed to the end of the protrusion 22b via the valve fixture 14. Further, the valve 15 is formed with an insertion portion 15b that is inserted into the protrusion portion 22b. The insertion portion 15b is provided with a seal member 15c for sealing the accommodation space 17, and is also formed with a passage 15d through which hydrogen gas passes.

The first resin layer 121 is formed of a fiber bundle F1 (first fiber bundle) impregnated with a first resin made of a thermoplastic resin. The first resin layer 121 forms a part of the dome body part 22a and a part of the protrusion part 22b, and is arranged so that the fibers are continuous from the protrusion part 22b to the dome body part 22a. Here, the first resin layer 121 is arranged so that the fibers are continuous from the protrusion 22b to the peripheral edge of the dome main body 22a. Further, the first resin layer 121 is formed in the protrusion 22b so that the fiber direction is along the axial direction X of the protrusion 22b (here, parallel to the axial direction X). Note that the detailed fiber direction in the protruding portion 22b of the first resin layer 121 will be described later.

The second resin layer 122 is formed of a fiber bundle F2 (second fiber bundle) impregnated with a second resin made of a thermosetting resin. The second resin layer 122 is formed to cover the first resin layer 121. Further, the second resin layer 122 is formed such that the fiber direction of the second resin layer 122 intersects with the fiber direction of the first resin layer 121.

The outer reinforcing layer 13 is formed to cover the outer surface of the reinforcing body 20. The outer reinforcing layer 13 covers the entire dome members 22 and 23. The outer reinforcing layer 13 is made of resin and fibers (continuous fibers). In the outer reinforcing layer 13, the fibers are oriented parallel to or inclined at an angle of 45 degrees or less with respect to the axial direction Oriented. This fiber prevents the dome members 22 and 23 from moving outward in the axial direction

Next, a method for manufacturing the high pressure tank 10 according to the first embodiment of the present invention will be described. FIG. 2 is a flowchart showing a method for manufacturing the high-pressure tank 10. As shown in FIG. 2, the method for manufacturing the high-pressure tank 10 includes a liner preparation step S1, a dome member forming step S2, a cylindrical member forming step S3, a joining step S4, and an outer reinforcing layer forming step S5. It consists of Although FIG. 2 shows that the liner preparation step S1, the dome member formation step S2, and the cylinder member formation step S3 are performed in this order, the liner preparation step S1, the dome member formation step S2, and the cylinder member formation step S3 are performed in this order. Since these are mutually independent steps, they may be performed in parallel, or any of the steps may be performed first.

In the liner preparation step S1, as shown in FIG. 1, the liner has a cylindrical tube portion and dome portions at both ends of the tube portion, and one dome portion has a gas flow path connecting the inside and the outside. A liner 11 in which a cylindrical protrusion is formed is prepared. Note that the method for manufacturing the liner 11 is not particularly limited, and can be manufactured using a known technique.

As shown in FIG. 3, the dome member forming step S2 includes a first resin layer forming step S21, a second resin layer forming step S22, and a removing step S23. The first resin layer forming step S21, the second resin layer forming step S22, and the removing step S23 are for forming the dome member 22, but it is also possible to form the dome member 23 at the same time. Further, it is also possible to form the dome member 23 in a separate process from that of the dome member 22. Here, a method for forming the dome member 22 and the dome member 23 in separate steps will be explained, and then a method for forming the dome member 22 and the dome member 23 at the same time will be explained.

In the first resin layer forming step S21, as shown in FIG. 4, a first resin layer 121 is formed on the outer surface of the mandrel 200. Specifically, the mandrel 200 has a dome-shaped main body part 201 and a shaft part 202 extending outward from the main body part 201. Then, as shown in FIG. 5, for example, using a tape placement method, the fiber bundle F1 impregnated with a thermoplastic resin is applied to the outer surface of the mandrel 200 using a pressure roller 210 while being pressed. At this time, the resin impregnated in the fiber bundle F1 is heated and softened using a laser device (not shown), and the fiber bundle F1 is attached (placed) on the mandrel 200. The resin impregnated into the attached fiber bundle F1 is immediately solidified as heat is removed by the mandrel 200. In this way, by using the fiber bundle F1 impregnated with thermoplastic resin, the resin impregnated into the pasted fiber bundle F1 can be immediately solidified, so that while applying tension to the fiber bundle F1, Can be pasted. Therefore, since the fiber directions of the fiber bundle F1 are aligned, it is possible to suppress a decrease in the tensile strength of the first resin layer 121. Furthermore, cooling air may be applied to the fiber bundle F1 so that the thermoplastic resin impregnated into the fiber bundle F1 solidifies more quickly. Although the material of the mandrel 200 is not particularly limited, it is preferably metal in order to ensure the strength to prevent deformation when arranging the fiber bundle F1 and the fiber bundle F2, which will be described later.

Here, the fiber bundle F1 is arranged so as to be continuous from the main body part 201 to the shaft part 202 of the mandrel 200. In this embodiment, the fiber bundle F1 is arranged so as to be continuous from the peripheral edge of the main body section 201 to the shaft section 202. Further, the fiber bundle F1 is arranged in the shaft portion 202 so that the fiber direction is along the axial direction X of the shaft portion 202 (here, parallel to the axial direction X). Further, the fiber bundles F1 are arranged at predetermined angular intervals in the circumferential direction of the mandrel 200. In this way, the first resin layer 121 of the dome member 22 is formed so as to spread radially (radially) from the shaft portion 202 of the mandrel 200.

In the second resin layer forming step S22, from the state shown in FIG. (see FIG. 7). Note that the state in which the second resin layer 122 is formed to cover the first resin layer 121 from the state shown in FIG. 4 is the same as a part of FIG. 7, which will be described later, so the illustration is omitted here. When forming the second resin layer 122, for example, similarly to the first resin layer 121, using the tape placement method, an uncured thermosetting resin made of a thermosetting resin is applied using the pressure roller 210 so as to cover the outer surface of the mandrel 200. The fiber bundle F2 impregnated with the second resin may be attached under pressure. Moreover, at this time, the fiber bundle F2 is arranged so that the fiber direction of the fiber bundle F2 intersects with the fiber direction of the fiber bundle F1.

Then, the second resin layer 122 (that is, the uncured thermosetting resin impregnated into the fiber bundle F2) is heated and cured. At this time, preferably, the curing temperature of the thermosetting resin of the second resin layer 122 is set lower than the softening temperature of the thermoplastic resin of the first resin layer 121. For example, by adjusting the amount and type of curing agent contained in the thermosetting resin of the second resin layer 122, the curing temperature of the thermosetting resin of the second resin layer 122 can be changed. The curing temperature of the thermosetting resin 122 can be easily set lower than the softening temperature of the thermoplastic resin of the first resin layer 121. With this configuration, it is possible to suppress the first resin of the first resin layer 121 from being softened when the second resin layer 122 is cured, and the fibers included in the first resin layer 121 can be prevented from being bent. Misalignment can be suppressed.

In the removal step S23, the first resin layer 121 and the second resin layer 122 are removed from the mandrel 200. Thereby, the dome member 22 is formed. In this manner, by removing the second resin layer 122 from the mandrel 200 after heating and curing the second resin layer 122, deformation of the second resin layer 122 can be suppressed.

When forming the dome member 23 in a separate process from the dome member 22, for example, the third resin layer 125 is formed on the outer surface of the main body portion 201 of the mandrel 200 that does not have the shaft portion 202. At this time, the third resin layer 125 is formed in the same manner as the second resin layer 122, that is, by pasting fiber bundles impregnated with a third resin made of a thermosetting resin using the tape placement method. can do. Then, the third resin layer 125 is heated and hardened. Thereafter, the dome member 23 is formed by removing the third resin layer 125 from the mandrel 200.

The thermoplastic resin contained in the first resin layer 121 is not particularly limited, but polyether ether ketone, polyphenylene sulfide, polyacrylic ester, polyimide, polyamide, etc. can be used.

Further, the thermosetting resin contained in the second resin layer 122 and the third resin layer 125 is not particularly limited, but thermosetting resins such as phenol resin, melamine resin, urea resin, and epoxy resin are used. It is preferable to use an epoxy resin, and it is particularly preferable to use an epoxy resin from the viewpoint of mechanical strength. Generally, an epoxy resin is a resin obtained by mixing and thermosetting a prepolymer such as a copolymer of bisphenol A and epichlorohydrin and a curing agent such as a polyamine. Epoxy resin has fluidity in an uncured state, and forms a strong crosslinked structure after thermosetting.

Further, as the fibers included in the first resin layer 121, the second resin layer 122, and the third resin layer 125, glass fibers, aramid fibers, boron fibers, carbon fibers, etc. can be used, and in particular, light weight and It is preferable to use carbon fiber from the viewpoint of mechanical strength and the like.

Next, a case where the dome member 23 and the dome member 22 are formed simultaneously (in the same process) will be described. Note that in this method, the third resin layer 125 is formed by the fiber bundle F2.

In the first resin layer forming step S21, a mandrel 200 as shown in FIG. 6 is used. In this mandrel 200, the main body portion 201 is formed into a substantially spherical shape. Then, the first resin layer 121 is formed on the outer surface of the mandrel 200 in the same manner as described above.

In the second resin layer forming step S22, as shown in FIG. 7, the second resin layer 122 is formed on the outer surface of the mandrel 200 so as to cover the first resin layer 121. At this time, the second resin layer 122 can be formed by pasting the fiber bundle F2 using the above-mentioned tape placement method, but it is also possible to form the second resin layer 122 by, for example, winding the fiber bundle F2 using the filament winding method (FW method). The second resin layer 122 can be formed by the following steps. Specifically, the shaft portion 202 of the mandrel 200 is attached to a rotation mechanism (not shown). Then, by rotating the mandrel 200, the fiber bundle F2 is wound so as to cover the first resin layer 121 and the outer surface of the mandrel 200. At this time, the fiber bundle F2 is wound at an angle that intersects with the axial direction X of the shaft portion 202 by, for example, 40 degrees or more. Then, the thermosetting resin impregnated into the fiber bundle F2 is heated and hardened.

In the removal step S23, the wound body (fiber bundle F2) wound around the outer surface of the mandrel 200 is divided into two pieces along the two-dot chain line L in FIG. 7 using a cutter (not shown). The two dome members 22 and 23 are then formed by separating the divided turns from the mandrel 200.

In this embodiment, after the removal step S23, the valve fixture 14 is caulked and fixed to the protrusion 22b. Note that the valve fixture 14 may be fixed before the dome member 22 is removed from the mandrel 200. Further, the valve fixture 14 may be fixed before heating and hardening the second resin layer 122, and in this case, the valve fixture 14 can be firmly fixed to the protrusion 22b.

In the cylindrical member forming step S3, as shown in FIG. 8, the cylindrical member 21 is formed by, for example, a so-called CW (Centrifugal Winding) method in which a fiber sheet F3 is attached to the inner surface of a rotating cylindrical mold 300. Specifically, the cylindrical mold 300 is rotated at a predetermined rotational speed by a rotation mechanism (not shown).

Inside the cylindrical mold 300, an unwinding roller 310 of an unwinding device (not shown) that unwinds the rolled fiber sheet F3 is provided. By unwinding the fiber sheet F3 while rotating the cylindrical mold 300, the fiber sheet F3 sticks to the inner surface of the cylindrical mold 300, and the cylindrical member 21 is formed.

The fiber sheet F3 has at least fibers oriented in the circumferential direction of the unwinding roller 310. Thereby, the cylindrical member 21 in which the fibers are oriented in the circumferential direction can be obtained.

The fiber sheet F3 may be, for example, a so-called UD (Uni-Direction) sheet in which a plurality of fiber bundles aligned in a single direction are woven together with a restraining yarn, or a sheet made of a plurality of fiber bundles aligned in a single direction and a plurality of fiber bundles aligned in a single direction. It is possible to use a fiber sheet in which a plurality of fiber bundles intersecting with, for example, orthogonal to, the fiber bundles of the fiber bundles are woven together and impregnated with a resin in advance.

Although the third resin impregnated into the fiber sheet F3 is not particularly limited, for example, a thermosetting resin can be used. As the thermosetting resin, similarly to the fiber bundle F2, it is preferable to use thermosetting resins such as phenol resin, melamine resin, urea resin, and epoxy resin, and in particular, epoxy resin is used from the viewpoint of mechanical strength. It is preferable.

As for the fibers constituting the fiber sheet F3, similar to the fiber bundles F1 and F2, glass fibers, aramid fibers, boron fibers, carbon fibers, etc. can be used. Preferably, fibers are used.

The cylindrical member 21 formed on the inner surface of the cylindrical mold 300 is formed so that the thickness at both ends in the axial direction X becomes gradually thinner, as shown in FIG. Further, the dome members 22 and 23 are similarly formed so that the thickness of the peripheral edge portions becomes gradually thinner. As a result, when the cylindrical member 21 and the two dome members 22 and 23 are combined, a step is less likely to be formed at the connection portion between the outer surface of the cylindrical member 21 and the outer surface of the two dome members 22 and 23.

In order to gradually reduce the thickness of both ends of the cylindrical member 21 in the axial direction X, the ends of the fiber sheet F3 in the axial direction It is preferable that it is woven. Alternatively, the thickness may be gradually reduced by pressing both ends of the cylindrical member 21 in the axial direction X with rollers or the like. Furthermore, in order to gradually reduce the thickness of the peripheral edges of the dome members 22 and 23, the number and winding direction of the fiber bundle F2 may be adjusted, or the peripheral edges may be pressed down with a roller or the like.

After the cylindrical member 21 is heated and hardened, the cylindrical member 21 is removed from the inside of the cylindrical mold 300. Thereby, deformation of the cylindrical member 21 when the cylindrical member 21 is removed from the cylindrical mold 300 can be suppressed.

Although an example in which the cylindrical member 21 is formed on the inner surface of the cylindrical mold 300 has been described here, the cylindrical member 21 can also be formed by other methods. For example, the cylindrical member 21 may be formed by pasting the fiber sheet F3 on the outer surface of the cylindrical shape, or by hoop-winding a fiber bundle impregnated with the third resin on the outer surface of the cylindrical shape by the FW method. .

Further, since the dome members 22 and 23 are formed using the mandrel 200 and the cylindrical member 21 is formed using the cylindrical mold 300, the cylindrical member 21 and the dome member 22 are formed without directly winding fiber bundles etc. around the liner 11. and 23 are formed. As a result, the winding force due to hoop winding, helical winding, etc. does not act on the liner 11, so there is no need to increase the strength of the liner 11 so that the liner 11 does not deform due to the winding force. Therefore, the thickness (wall thickness) of the liner 11 can be reduced, so the volume of the liner 11 can be increased and the weight of the liner 11 can be reduced.

In the joining step S4, as shown in FIGS. 9 and 10, the peripheral edge 21a at both ends of the cylindrical member 21 and the peripheral edges 22d and 23a of the two dome members 22 and 23 are joined to form a reinforcement layer. A body 20 is formed.

Specifically, the liner 11 prepared in the liner preparation step S1 is inserted into the cylindrical member 21, and the dome members 22 and 23 are placed over both ends of the liner 11. At this time, in this embodiment, the dome members 22 and 23 are fitted with their peripheral edges 22d and 23a on the inside, and the peripheral edges 21a at both ends of the cylindrical member 21 are placed on the outside. The first resin layer 121 of the dome member 22 is exposed on the inside (liner 11 side), and the first resin layer 121 contains a thermoplastic resin, so the first resin layer 121 is formed of a thermosetting resin. The adhesion to the liner 11 is higher than that in the case where it is. Here, an example is shown in which the dome member 23 is formed of the third resin layer 125 containing a thermosetting resin, but like the dome member 22, the dome member 23 is also formed of a resin layer containing a thermoplastic resin and a thermosetting resin. It may also be formed by a resin layer containing. In this case, the adhesion of the dome member 23 to the liner 11 can also be increased.

Note that the peripheral edges 22d and 23a of the dome members 22 and 23 may be placed outside, and the peripheral edges 21a at both ends of the cylindrical member 21 may be fitted inside. The peripheral edge portions 21a at both ends of the cylindrical member 21 may be joined by butting against each other. Further, an adhesive (not shown) may be placed between the cylindrical member 21 and the dome members 22 and 23.

In the outer reinforcing layer forming step S5, an outer reinforcing layer 13 made of fiber reinforced resin and having fibers arranged across the two dome members 22 and 23 is formed so as to cover the outer surface of the reinforcing body 20. As a result, the fiber reinforced resin layer 12 having the reinforcing body 20 and the outer reinforcing layer 13 is formed. For example, the outer reinforcing layer 13 may be formed by helically winding a fiber bundle impregnated with a thermosetting resin around the outer surface of the reinforcing body 20. Alternatively, the outer reinforcing layer 13 may be formed by attaching a plurality of fiber bundles impregnated with a thermosetting resin to the outer surface of the reinforcing body 20 while extending in the axial direction X of the reinforcing body 20. The outer reinforcing layer 13 may be formed using a so-called sheet winding method in which a fiber sheet impregnated with a thermosetting resin is wound around the outer surface of the reinforcing body 20. Then, the thermosetting resin contained in the outer reinforcing layer 13 is heated and hardened. As the thermosetting resin and fiber bundle included in the outer reinforcing layer 13, for example, the same thermosetting resin and fiber bundle as those forming the dome members 22 and 23 can be used.

Then, by attaching the valve 15 to the valve fixture 14, the high pressure tank 10 is completed. Note that although an example has been shown in which the valve 15 is attached to the protrusion 22b via the valve fixture 14, the present invention is not limited to this. For example, the valve 15 may be directly attached to the outer peripheral surface of the protrusion 22b without using the valve fixture 14. In this case, the valve 15 may be fixed by caulking to the outer peripheral surface of the protrusion 22b.

Next, the relationship between the fiber direction and the tensile strength in the axial direction X in the protruding portion 22b of the first resin layer 121 will be described. As shown in FIG. 11, when the tensile strength in the axial direction X is normalized as 100 when the fiber direction of the first resin layer 121 in the protruding portion 22b is parallel to the axial direction X (90 degrees in FIG. 11), the fiber When the direction is inclined by 10 degrees, 20 degrees, and 30 degrees (respectively 80 degrees, 70 degrees, and 60 degrees in FIG. 11) with respect to the axial direction X, the tensile strength decreases to about 90, 65, and 33 degrees. Note that the angle that can be formed by the FW method is usually 0 to 30 degrees as shown in FIG. 11, so if the protrusion 22b is formed by the FW method, the tensile strength will be about 8.

In this embodiment, the first resin layer 121 is formed such that the fiber direction in the protrusion 22b is along the axial direction X of the protrusion 22b, and specifically, the inclination angle of the fiber direction with respect to the axial direction X is The angle is 20 degrees or less, preferably 10 degrees or less, and more preferably 0 degrees (70 degrees or more, 80 degrees or more, and 90 degrees in FIG. 11, respectively). Thereby, sufficient tensile strength of the protruding portion 22b can be ensured.

In this embodiment, as described above, the fiber bundle F1 is arranged in the protrusion 22b so that the fiber direction is along the axial direction X of the protrusion 22b. Thereby, the tensile strength in the axial direction of the protruding portion 22b can be ensured. Moreover, the fiber bundle F1 is arranged so as to be continuous from the protrusion part 22b to the dome main body part 22a, and the fiber bundle F2 is arranged so as to cover the fiber bundle F1. Thereby, the fiber bundle F2 can restrain the movement of the fiber bundle F1, and can prevent the protrusion part 22b from slipping out from the dome main body part 22a. In addition, since the fiber bundle F2 is provided so that the fiber direction of the fiber bundle F2 intersects with the fiber direction of the fiber bundle F1, the tensile strength not only in the axial direction X but also in other directions such as the radial direction can be secured. Therefore, the pressure inside the high-pressure tank 10 becomes high, and a large force is applied to the outside in the axial direction Even in the case where the protruding portion 22b is damaged, damage to the protruding portion 22b can be suppressed. Therefore, since there is no need to provide a cap, the weight of the high-pressure tank 10 can be reduced.

Further, as described above, the resin impregnated into the fiber bundle F1 is made of a thermoplastic resin, and the first resin impregnated into the fiber bundle F2 is made of a thermosetting resin. In this way, by using a thermoplastic resin as the first resin impregnated into the fiber bundle F1, by placing the fiber bundle F1 on the surface of the mandrel or liner 11 in a state where the first resin is softened, the fiber The heat of the fiber bundle F1 is absorbed by the mandrel 200 and the liner 11, and the resin impregnated into the fiber bundle F1 is solidified. As a result, the fiber bundle F2 is placed on the fiber bundle F1 in which the first resin is solidified. Therefore, when the fiber bundle F2 is arranged, the fiber bundle F1 is not bent or displaced, so that the tensile strength of the protrusion 22b in the axial direction X can be prevented from decreasing. Further, by using a thermosetting resin as the second resin impregnated into the fiber bundle F2, the mechanical strength of the protruding portion 22b after the second resin is cured can be easily improved.

(Second embodiment)
In this second embodiment, unlike the first embodiment, the inner surfaces of the dome members 22 and 23 (the surfaces that come into contact with hydrogen gas, as described later) are formed by a fiber bundle F1 impregnated with a thermoplastic resin. An example will be explained below.

In the high-pressure tank 10 of this embodiment, as shown in FIG. 12, the liner 11 is formed only of a cylindrical tube portion.

In this embodiment, the dome member 22 includes a first resin layer 121 and a second resin layer 122 formed to cover the first resin layer 121. The first resin layer 121 is different from the first embodiment described above, and is formed over the entire inner surface (the surface that comes into contact with hydrogen gas, that is, the inner surface of the dome body portion 22a and the inner surface of the protruding portion 22b).

Further, unlike the first embodiment described above, the dome member 23 includes a fourth resin layer 126 and a third resin layer 125 that covers the fourth resin layer 126. The fourth resin layer 126 is made of a fiber bundle impregnated with a thermoplastic resin, and is formed over the entire inner surface (the surface that comes into contact with hydrogen gas).

That is, the dome members 22 and 23 have gas barrier properties over the entire inner surface and have the same function as the dome-shaped both ends of the liner 11 in the first embodiment, so in this embodiment, the liner 11 is formed into a cylindrical shape with both ends open. The cylindrical liner 11, the first resin layer 121, and the fourth resin layer 126 form an accommodation space 17 filled with hydrogen gas.

The other structure of the second embodiment is the same as that of the first embodiment.

Next, a method for manufacturing the high pressure tank 10 according to the second embodiment of the present invention will be described. In this embodiment, in the liner preparation step S1, a cylindrical liner 11 with both ends open is prepared. Note that the method for manufacturing the liner 11 is not particularly limited, and can be manufactured using a known technique.

Similar to the first embodiment, the dome member forming step S2 includes a first resin layer forming step S21, a second resin layer forming step S22, and a removing step S23, as shown in FIG. There is.

In the first resin layer forming step S21, as shown in FIG. 13, the first resin layer 121 is formed to cover the entire outer surface of the mandrel 200. At this time, as shown in FIG. 13, all the fiber bundles F1 may be attached so as to spread radially (in the radial direction) from the shaft portion 202 of the mandrel 200, or, for example, in the state shown in FIGS. 4 and 6. Further, the fiber bundles F1 may be attached at various angles so that the fiber bundles F1 intersect with each other. In this way, the first resin layer 121 of the dome member 22 is formed.

When forming the fourth resin layer 126 of the dome member 23, it can be formed in the same manner as the method of forming the first resin layer 121, but since the dome member 23 does not have the protrusion 22b, the shaft of the mandrel 200 It is not necessary to provide the fourth resin layer 126 so as to spread radially from the portion 202. Further, similarly to the first embodiment, the dome member 23 can be formed at the same time as the dome member 22 (in the same process).

Other manufacturing methods of the second embodiment are the same as those of the first embodiment.

In this embodiment, as described above, when forming the dome members 22 and 23, the surfaces of the dome members 22 and 23 that come into contact with hydrogen gas are formed from the fiber bundle F1. Since thermoplastic resin has gas barrier properties, by forming the surfaces of the dome members 22 and 23 that come into contact with hydrogen gas with the fiber bundle F1 impregnated with the thermoplastic resin, the inner surfaces of the dome members 22 and 23 are There is no need to provide (the dome-shaped ends of the liner 11). Thereby, the weight of the high pressure tank 10 can be further reduced.

Other effects of the second embodiment are similar to those of the first embodiment.

(Third embodiment)
In the third embodiment, unlike the first embodiment, an example will be described in which an insert 16 for attaching a metal valve 18 is disposed inside the protrusion 22b of the dome member 22.

In the high-pressure tank 10 of this embodiment, as shown in FIG. 15, a cylindrical insert 16 made of metal, for example, is arranged inside the protrusion 22b of the dome member 22. In this embodiment, the dome member 22 includes the liner 11 , the insert 16 , the first resin layer 121 formed so as to cover the liner 11 and the insert 16 , and the first resin layer 121 formed so as to cover the first resin layer 121 . 2 resin layers 122.

The insert 16 has a female thread 16a on its inner peripheral surface. The insert 16 is disposed inside the first resin layer 121 of the dome member 22 and adjacent to the tip of the cylindrical protrusion of the liner 11 in the axial direction. The insert 16 has, for example, a cylindrical shape with a tapered inner end in the axial direction of the high-pressure tank 10 .

The valve 18 is formed with an insertion portion 18a that is inserted into the protrusion 22b. A male screw 18b that screws into the female screw 16a of the insert 16 and a seal member 18c that seals the accommodation space 17 are provided on the outer peripheral surface of the insertion portion 18a. Further, although not shown, the valve 18 is formed with a passage through which hydrogen gas passes, similar to the passage 15d of the valve 15 of the first embodiment shown in FIG.

The other structure of the third embodiment is the same as that of the first embodiment.

Next, a method for manufacturing the high pressure tank 10 according to the third embodiment of the present invention will be described. In the present embodiment, in the first resin layer forming step S21 in which the fiber bundle F1 (first fiber bundle) is arranged, for example, the insert 16 having the internal thread 16a on the inner peripheral surface is inserted into the shaft portion 202 of the mandrel 200 shown in FIG. It is supported on the outer periphery of the tip. Then, the fiber bundle F1 is arranged around the outer periphery of the insert 16 and the outer periphery of the mandrel 200.

Other manufacturing methods of the third embodiment are the same as those of the first embodiment. More specifically, in the first resin layer forming step S21 similar to the first embodiment described above, the first resin layer 121 is formed on the outer surface of the insert 16 and the outer surface of the mandrel 200, similarly to FIG. 4 or FIG. . Here, the fiber bundle F1 constituting the first resin layer 121 is arranged in the insert 16 and the shaft part 202 so that the fiber direction is along the axial direction X of the shaft part 202 (here, parallel to the axial direction X). As a result, in the first resin layer 121 of the protrusion 22b shown in FIG. 15, the fiber bundle F1 is arranged along the axial direction of the protrusion 22b (here parallel to the axial direction of the protrusion 22b). Ru.

In addition, in the second resin layer forming step S22 similar to the first embodiment described above, as shown in FIG. , a second resin layer 122 is formed on the outer surface of the mandrel 200. At this time, the fiber bundle F2 constituting the second resin layer 122 is arranged such that the fiber direction of the fiber bundle F2 intersects with the fiber direction of the fiber bundle F1 at least on the outer periphery of the insert 16 and the outer periphery of the shaft portion 202 ( Here, they are arranged so that they are perpendicular or intersect at an angle of 80 degrees or more).

Further, the fiber bundle F2 wound around the outer periphery of the insert 16 and the outer periphery of the shaft portion 202 is continuously wound from the outer periphery of the insert 16 and the outer periphery of the shaft portion 202 to the outer periphery of the dome-shaped mandrel 200. As a result, the second resin layer continuous from the protrusion 22b of the dome member 22 to the dome-shaped portion shown in FIG. 122 are integrally wound and molded.

As shown in FIG. 17, a conventional high-pressure tank 90 includes a tank body 91 and a cap 92 attached to an open end of the tank body 910 in the longitudinal direction. The tank body 91 includes, for example, a liner 911 for keeping hydrogen gas airtight, and a reinforcing layer 912 whose outer surface is reinforced by wrapping a fiber bundle impregnated with resin. The cap 92 has a flange portion 921 on the inside of the high-pressure tank 900 in the axial direction, the diameter of which is larger than that of other portions. The cap 92 has a female thread or a male thread, and a valve (not shown) is screwed and attached thereto.

In such a conventional high-pressure tank 90, a thrust force TF acts on the reinforcing layer 912 toward the outside in the axial direction of the high-pressure tank 90 from the flange portion 921 of the base 92, which receives the internal pressure of the high-pressure tank 90. As shown in FIG. 18, such thrust force TF increases the stress acting on the fibers at the outer edge 921a of the flange portion 921 of the cap 92, the fiber intersection 921x on the flange portion 921 of the cap 92, etc. , causing a stress concentration area SC in the high pressure tank 900. Furthermore, during low-temperature filling of the high-pressure tank 900, due to the difference in linear expansion coefficient between the reinforcing layer 912 and the cap 92, as shown in FIG. As a result, the liner 911 may be stretched and damaged.

On the other hand, in the method for manufacturing the high-pressure tank 10 of the present embodiment, in the step of arranging the fiber bundle F1 (first fiber bundle), the fiber bundle F1 is arranged on the outer periphery of the insert 16 having the internal thread 16a on the inner peripheral surface. . Thereby, the cylindrical insert 16 is arranged inside the protruding portion 11b of the dome member 22, and the high-pressure tank 10 in which the insert 16 has the internal thread 16a on the inner peripheral surface can be manufactured.

Thereby, the male thread 18b on the outer peripheral surface of the valve 18 can be screwed into the female thread 16a on the inner peripheral surface of the insert 16, and the valve 18 can be attached to the cylindrical insert 16 arranged inside the protrusion 22b. With this configuration, the tensile force due to the internal pressure P of the high-pressure tank 10 acts on the entire circumference of the connecting portion between the dome main body portion 22a and the protruding portion 22b of the dome member 22, such as the intersection of the fiber bundles F1 and F2, etc. This prevents stress from concentrating on specific parts.

Therefore, even if the internal pressure P of the high-pressure tank 10 acts on the valve 18 and a tensile force is applied to the protruding portion 22b in the axial direction outward of the high-pressure tank 10, stress concentration on a specific portion can be avoided, and the fiber It is possible to improve the strength utilization rate of the bundles F1 and F2. Therefore, it is possible to reduce the weight of the high-pressure tank 10 by reducing the amount of fiber bundles F1 and F2 used. Furthermore, damage to the liner 11 can be prevented by preventing stress concentration.

Note that the fiber bundle F1 (first fiber bundle) is arranged on the outer periphery of the fiber bundle F2 (second fiber bundle) arranged on the outer periphery of the insert 16, and the fiber bundle F2 is further arranged on the outer periphery of the fiber bundle F2. It may also be placed in an intermediate layer between the bundles F2. In this case, both surfaces of the fiber bundle F1 can be adhered to the fiber bundle F2.

Other effects of the third embodiment are similar to those of the first embodiment.

Note that the embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims rather than the description of the embodiments described above, and includes all changes within the meaning and range equivalent to the claims.

For example, in the above embodiment, an example has been described in which a reinforcing body as a reinforcing layer is formed by forming two dome members and a cylindrical member separately and then joining them, but the present invention is not limited to this. . For example, the cylindrical member of the reinforcing layer and the two dome members may be formed simultaneously by arranging the first fiber bundle and the second fiber bundle on the surface of a resin liner formed by a known manufacturing method. . In this case, the step of joining the cylindrical member and the two dome members is unnecessary.

Further, in the above embodiment, an example in which the first fiber bundle is impregnated with a thermoplastic resin has been described, but the present invention is not limited to this, and the first fiber bundle may be impregnated with a thermosetting resin. In this case, in the process of arranging the first fiber bundles, while arranging the first fiber bundles, for example, hot air is blown onto the arranged first fiber bundles to remove the thermosetting resin impregnated into the first fiber bundles. It may be solidified by curing. However, since it is easier to solidify using a thermoplastic resin, it is preferable that the resin impregnated into the first fiber bundle is a thermoplastic resin.

Further, in the above embodiment, an example in which the second fiber bundle is impregnated with a thermosetting resin has been described, but the present invention is not limited to this, and the second fiber bundle may be impregnated with a thermoplastic resin. However, from the viewpoint of mechanical strength, it is preferable that the resin impregnated into the second fiber bundle is a thermosetting resin.

Further, in the above embodiment, the first resin layer 121 is arranged from the protrusion 22b to the peripheral edge of the dome main body 22a, but the present invention is not limited to this. , as long as they are arranged from the protrusion 22b to the dome main body 22a, they do not need to be arranged all the way to the peripheral edge of the dome main body 22a. That is, as shown in FIG. 14, for example, if the fiber bundle F1 is arranged from the shaft part 202 to the main body part 201 of the mandrel 200, it is not necessary to arrange it all the way to the peripheral part of the main body part 201.

Further, in the above embodiment, an example in which the cylindrical member is formed of one member has been described, but the present invention is not limited to this. For example, the cylindrical member may be formed of two or more members. In this case, after two or more cylindrical members are joined to each other, dome members may be joined to both ends thereof. Moreover, after joining the cylindrical members to the dome member one by one, they may be joined.

Further, in the above embodiment, an example was described in which the liner is prepared and then the cylindrical member and the dome member are arranged and joined to cover the liner, but the present invention is not limited to this. For example, after the reinforcing body is formed by joining the cylindrical member and the dome member, a liner may be formed inside the reinforcing body. In this case, for example, the liner may be formed by reaction injection molding using two or more types of low molecular weight, low viscosity liquid materials that are fluid at room temperature as resin materials. Alternatively, as in blow molding, the liner may be formed by extruding a heated and softened resin material into a cylindrical shape inside the reinforcing body and sending compressed air into the cylindrical resin material. Alternatively, the liner 11 may be formed by spraying a liquid or softened resin material onto the inner surface of the reinforcing body, such as by thermal spraying.

10: High pressure tank, 11: Liner, 16: Insert, 16a: Female thread, 20: Reinforcement body (reinforcement layer), 21: Cylindrical member, 22, 23: Dome member, 22a: Dome main body, 22b: Projection, 22c : Gas flow path, F1: Fiber bundle (first fiber bundle), F2: Fiber bundle (second fiber bundle), X: Axial direction

Claims (5)

The reinforcing layer includes a liner that accommodates gas and a reinforcing layer made of fiber reinforced resin that covers the outer surface of the liner, and the reinforcing layer is integrally formed with a cylindrical member and two dome members provided at both ends of the cylindrical member. One of the dome members includes a dome body and a cylindrical protrusion that protrudes from the dome body and has a gas flow path for filling and discharging gas. A method for manufacturing a high pressure tank, the method comprising:
comprising a step of forming at least one of the dome members,
The step of forming at least one of the dome members includes:
arranging a first fiber bundle impregnated with a first resin so as to form a part of the protrusion and a part of the dome main body;
arranging a second fiber bundle impregnated with a second resin so as to cover the first fiber bundle;
including;
In the step of arranging the first fiber bundle, the first fiber bundle is arranged such that the fiber direction in the protrusion is along the axial direction of the protrusion and continues from the protrusion to the dome main body. while arranging, solidifying the first resin impregnated into the arranged first fiber bundle,
In the step of arranging the second fiber bundle, the second fiber bundle is arranged so that the fiber direction of the second fiber bundle intersects with the fiber direction of the first fiber bundle ,
The first resin is made of a thermoplastic resin,
The second resin is made of a thermosetting resin,
In the step of arranging the first fiber bundle, while arranging the first fiber bundle in a state where the first resin is softened, the first resin impregnated into the arranged first fiber bundle is solidified;
Manufacturing a high-pressure tank, characterized in that in the step of arranging the second fiber bundle, after arranging the second fiber bundle while the second resin is uncured, the second resin is heated and cured. Method. 2. The method of manufacturing a high-pressure tank according to claim 1 , wherein when forming the two dome members, a surface of the dome member that comes into contact with the gas is formed from the first fiber bundle. The reinforcing layer includes a liner that accommodates gas and a reinforcing layer made of fiber reinforced resin that covers the outer surface of the liner, and the reinforcing layer is integrally formed with a cylindrical member and two dome members provided at both ends of the cylindrical member. One of the dome members is a high-pressure tank including a dome body and a protrusion that protrudes from the dome body and has a gas flow path for filling and discharging gas. There it is,
The dome main body portion and the protruding portion are formed of a first fiber bundle impregnated with a first resin and a second fiber bundle impregnated with a second resin,
The first fiber bundle constitutes a part of the protrusion and a part of the dome main body, and the fiber direction in the protrusion is along the axial direction of the protrusion and extends from the protrusion to the dome. It is arranged continuously all the way to the main body.
The second fiber bundle covers the first fiber bundle and is arranged such that the fiber direction of the second fiber bundle intersects with the fiber direction of the first fiber bundle,
The first resin is made of thermoplastic resin,
The second resin is made of a thermosetting resin,
A high-pressure tank characterized in that a surface of the dome member that comes into contact with the gas is formed of the first fiber bundle . The method for manufacturing a high-pressure tank according to claim 1 or 2 , wherein in the step of arranging the first fiber bundle, the first fiber bundle is arranged on the outer periphery of an insert having a female thread on the inner peripheral surface. . a cylindrical insert is disposed inside the protrusion;
4. The high-pressure tank according to claim 3 , wherein the insert has a female thread on its inner peripheral surface.

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