JP2021146725A - Method of producing high-pressure tank, and high-pressure tank - Google Patents

Abstract

To provide a method of producing a high-pressure tank, which is capable of suppressing damage to a protrusion having a gas flow path while reducing a weight of the high-pressure tank.SOLUTION: There is provided a method of producing a high-pressure tank 10, the tank comprises: a liner 11; and a reinforcement body 20 made of a fiber-reinforced resin, in which a dome member 22 included in the reinforcing body 20 includes a dome main body portion 22a and a protruding portion 22b, and the method comprises a process of forming the dome member 22, in which the process of forming the dome member includes: a process of placing a fiber bundle F1 so as to form a part of the protruding portion 22b and a part of the dome main body portion 22a; and a process of placing a fiber bundle F2 so as to cover the fiber bundle F1, and in the process of placing the fiber bundle F1, the first fiber bundle F1 is placed such that a fiber direction of the first fiber bundle in the protruding portion 22b follows an axial direction X of the protruding portion 22b, and a resin with which the fiber bundle F1 is impregnated is solidified.SELECTED DRAWING: Figure 1

Description

The present invention relates to a high-pressure tank provided with a liner for accommodating gas and a reinforcing layer made of a fiber-reinforced resin covering the outer surface of the liner, and a method for manufacturing the same.

Conventionally, as a high-pressure tank used for storing and supplying hydrogen and the like, a tank having a tank main body and a mouthpiece attached to an open end in the longitudinal direction of the tank main body is known. The tank body includes, for example, a liner for keeping hydrogen gas airtight, and a reinforcing layer whose outer surface is reinforced by wrapping it with a fiber bundle impregnated with resin.

As described above, a high-pressure tank including the liner, the reinforcing layer covering the outer surface thereof, and the base provided at the 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 a fiber reinforced resin covering the outer surface thereof, and a base provided at an end portion of the reinforcing layer. The base has a cylindrical protrusion having a gas flow path for filling and discharging hydrogen gas or the like.

JP-A-2018-179201

By the way, when trying to reduce the weight of the high-pressure tank from the viewpoint of transporting the high-pressure tank and improving the fuel efficiency of the vehicle equipped with the high-pressure tank, it is assumed that the part corresponding to the base is made of fiber reinforced plastic to reduce the weight. Will be done.

In this case, for example, a fiber bundle impregnated with resin is wound around an outer surface of a liner or the like provided with a cylindrical protrusion having a gas flow path by a filament winding method or the like, thereby corresponding to a base. It is conceivable to form a reinforcing layer having. However, the inside of the high-pressure tank becomes very high pressure, and a large force is applied to the valve attached to the tip of the protrusion in the axial direction, so that a large force is also applied to the protrusion itself in the axial direction. At this time, since the fiber bundle is spirally wound in the protruding portion, it is difficult to secure the axial tensile strength of the protruding portion. Therefore, it is possible that the protrusion is damaged.

The present invention has been made in view of these points, and is a high-pressure tank capable of suppressing damage to a protruding portion having a gas flow path while reducing the weight of the high-pressure tank, and a method for manufacturing the high-pressure tank. The challenge is to provide.

The method for manufacturing a high-pressure tank according to the present invention includes a liner for accommodating gas and a reinforcing layer made of a fiber-reinforced resin covering the outer surface of the liner, and the reinforcing layers are provided on a tubular member and both ends of the tubular member. It is a layer in which two dome members to be provided are integrally formed, and one of the dome members protrudes from the dome main body and the dome main body, and is a gas flow path for filling and discharging gas. A method for manufacturing a high-pressure tank including a cylindrical protrusion having A step of arranging the first fiber bundle impregnated with the first resin so as to form a part and a part of the dome main body portion, and a second resin impregnating so as to cover the first fiber bundle. In the step of arranging the first fiber bundle, which includes the step of arranging the second fiber bundle, the fiber direction of the protruding portion is along the axial direction of the protruding portion, and the protrusion is described as described above. In the step of arranging the first fiber bundle so as to be continuous to the dome main body, solidifying the first resin impregnated in the arranged first fiber bundle, and arranging the second fiber bundle, the first The second fiber bundle is arranged so 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 protruding portion so that the fiber direction is along the axial direction of the protruding portion. Thereby, the tensile strength in the axial direction of the protruding portion can be secured. Further, the first fiber bundle is arranged so as to be continuous from the protruding portion to the dome main body portion, and the second fiber bundle is arranged so as to cover the first fiber bundle. As a result, the second fiber bundle restrains the movement of the first fiber bundle, and the protruding portion can be prevented from coming out of the dome main body portion. Further, since the second fiber bundle is provided so that the fiber direction of the second fiber bundle intersects the fiber direction of the first fiber bundle, not only the tensile strength in the axial direction but also the tension in other directions such as the radial direction. Strength can also be ensured. Therefore, even when the inside of the high-pressure tank becomes high pressure and a large force is applied to the protruding portion outward in the axial direction, it is possible to prevent the protruding portion from being damaged. Therefore, since it is not necessary to provide a base, the weight of the high-pressure tank can be reduced.

In the method for manufacturing the high-pressure tank, preferably, the first resin is made of a thermoplastic resin, the second resin is made of a thermocurable resin, and in the step of arranging the first fiber bundle, the first resin is used. In the step of arranging the first fiber bundle in a softened state, the first resin impregnated in the arranged first fiber bundle is solidified, and the second fiber bundle is arranged, the second resin is used. After arranging the second fiber bundle in an uncured state, the second resin is heated and cured. In this way, by making the first resin impregnated in the first fiber bundle into a thermoplastic resin, the first fiber bundle is arranged on the surface of a mandrel or a liner, for example, in a softened state. The heat of the first fiber bundle is taken away by the mandrel and the liner, and the resin impregnated in the first fiber bundle solidifies. As a result, the second fiber bundle is arranged on the first fiber bundle in the state where the first resin is solidified. Therefore, when the second fiber bundle is arranged, the first fiber bundle does not bend or shift in position, so that it is possible to suppress a decrease in the axial tensile strength of the protruding portion. Further, by changing the second resin impregnated in the second fiber bundle to a thermosetting resin, the mechanical strength of the protruding portion 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 members in contact with the gas is formed by the first fiber bundle. Since the thermoplastic resin has a gas barrier property, the surface of the dome member that comes into contact with the gas is formed by the first fiber bundle impregnated with the thermoplastic resin, so that the liner (dome-shaped) is formed along the inner surface of the dome member. It is not necessary 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 for accommodating gas and a reinforcing layer made of a fiber-reinforced resin covering the outer surface of the liner, and the reinforcing layers are provided on a tubular member and both ends of the tubular member. A layer in which one dome member is integrally formed, and one of the dome members protrudes from the dome main body portion and the dome main body portion and has a gas flow path for filling and discharging gas. A high-pressure tank including a portion, the dome main body portion and the protruding portion 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 protruding portion and a part of the dome main body portion, and the fiber direction of the protruding portion is along the axial direction of the protruding portion, and the protruding portion is used as described. The second fiber bundle is continuously arranged up to the dome main body portion, 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 protruding portion so that the fiber direction is along the axial direction of the protruding portion. Thereby, the tensile strength in the axial direction of the protruding portion can be secured. Further, the first fiber bundle is arranged so as to be continuous from the protruding portion to the dome main body portion, and the second fiber bundle is arranged so as to cover the first fiber bundle. As a result, the second fiber bundle restrains the movement of the first fiber bundle, and the protruding portion can be prevented from coming out of the dome main body portion. Further, since the second fiber bundle is provided so that the fiber direction of the second fiber bundle intersects the fiber direction of the first fiber bundle, not only the tensile strength in the axial direction but also the tension in other directions such as the radial direction. Strength can also be ensured. Therefore, even when the inside of the high-pressure tank becomes high pressure and a large force is applied to the protruding portion outward in the axial direction, it is possible to prevent the protruding portion from being damaged. Therefore, since it is not necessary to provide a base, 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 in contact with the gas is the first fiber. It is formed by bundles. Since the thermoplastic resin has a gas barrier property, the liner (dome portion) along the inner surface of the dome member is formed by forming the surface of the dome member in contact with the gas with the first fiber bundle impregnated with the thermoplastic resin. There is no need to provide. This makes it possible to further reduce the weight of the high-pressure tank. Further, by making the second resin impregnated in the second fiber bundle a thermosetting resin, the mechanical strength of the protruding portion can be easily improved.

In the method for manufacturing the high-pressure tank, preferably, in the step of arranging the first fiber bundle, the first fiber bundle is arranged on the outer periphery of the insert having the female thread on the inner peripheral surface. Thereby, the insert can be arranged inside the protruding portion of the dome member, and the valve having the male screw on the outer peripheral surface can be screwed into the female screw on the inner peripheral surface of the insert, and the valve can be attached to the protruding portion. With such a configuration, even if the internal pressure of the high-pressure tank acts on the valve and the axially outward tensile force of the high-pressure tank acts on the protruding portion, stress concentration on a specific part can be avoided, and the liner can be used. Damage can be prevented. The first fiber bundle is arranged on the outer periphery of the second fiber bundle arranged on the outer periphery of the insert, and further, by arranging the second fiber bundle on the outer periphery thereof, the first fiber bundle is arranged in the intermediate layer between the second fiber bundles. May be good. In this case, both sides of the first fiber bundle can be adhered to the second fiber bundle.

In the high pressure tank, preferably, a cylindrical insert is arranged inside the protrusion, and the insert has a female screw on the inner peripheral surface. As a result, the valve having a 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 protruding portion. With such a configuration, even if the internal pressure of the high-pressure tank acts on the valve and a tensile force acting outward in the axial direction of the high-pressure tank acts on the protruding portion, stress concentration on a specific portion 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 high-pressure tank, which can suppress damage to a protrusion having a gas flow path while reducing the weight of the high-pressure tank.

It is sectional drawing which shows the structure of the high pressure tank which concerns on 1st Embodiment of this invention. It is a flowchart which shows the manufacturing method of the high pressure tank which concerns on 1st Embodiment of this invention. It is a flowchart which shows the dome member forming process of the manufacturing method of the high pressure tank which concerns on 1st Embodiment of this invention. It is a perspective view for demonstrating the dome member forming process of the manufacturing method of the high pressure tank which concerns on 1st Embodiment of this invention. It is sectional drawing for demonstrating the dome member forming process of the manufacturing method of the high pressure tank which concerns on 1st Embodiment of this invention. It is a perspective view for demonstrating the modification of the dome member forming process of the manufacturing method of the high pressure tank which concerns on 1st Embodiment of this invention. It is a perspective view for demonstrating the modification of the dome member forming process of the manufacturing method of the high pressure tank which concerns on 1st Embodiment of this invention. It is a perspective view for demonstrating the cylinder member forming process of the manufacturing method of the high pressure tank which concerns on 1st Embodiment of this invention. It is a perspective view for demonstrating the joining process of the manufacturing method of the high pressure tank which concerns on 1st Embodiment of this invention. It is sectional drawing for demonstrating the joining process of the manufacturing method of the high pressure tank which concerns on 1st Embodiment of this invention. It is a figure for demonstrating the relationship between the fiber direction and the tensile strength in an axial direction in a protrusion. It is sectional drawing which shows the structure of the high pressure tank which concerns on 2nd Embodiment of this invention. It is a perspective view for demonstrating the dome member forming process of the manufacturing method of the high pressure tank which concerns on 2nd Embodiment of this invention. It is a perspective view for demonstrating the dome member forming process of the manufacturing method of the high pressure tank of the modification of this invention. It is sectional drawing which shows the structure of the high pressure tank which concerns on 3rd Embodiment of this invention. It is a perspective view for demonstrating the dome member forming process of the manufacturing method of the high pressure tank which concerns on 3rd Embodiment of this invention. It is sectional drawing which shows an example of the structure of the conventional high pressure tank. It is a top view which shows an example of the stress distribution of the conventional high pressure tank.

(First Embodiment)
Hereinafter, the 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. Hereinafter, the high-pressure tank 10 will be described as a tank filled with high-pressure hydrogen gas mounted on a fuel cell vehicle, but it can also be applied to other uses. Further, the gas that can be filled in 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 substantially cylindrical high-pressure gas storage container having dome-shaped rounded ends. The high-pressure tank 10 includes a liner 11 having a gas barrier property, and a fiber-reinforced resin layer 12 made of a fiber-reinforced resin that covers the outer surface of the liner 11. The fiber reinforced resin layer 12 has a reinforcing body 20 as a reinforcing layer covering the outer surface of the liner 11, and an outer reinforcing layer 13 covering the outer surface of the reinforcing body 20. An opening is formed at one end of the high pressure tank 10. The high-pressure tank 10 of the present embodiment is not provided with a base. Further, 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 reinforcing body 20. The liner 11 is a resin member that forms a storage space 17 filled with high-pressure hydrogen gas. The resin constituting the liner 11 is preferably a resin having a good performance of holding the filled gas (hydrogen gas in this case) in the accommodation space 17, that is, a gas barrier property. 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 contains, for example, each compressed gas 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 has a function of covering the outer surface of the liner 11 and reinforcing the liner 11 to improve mechanical strength such as rigidity and pressure resistance of the high pressure tank 10. As will be described later, the reinforcing body 20 has a cylindrical tubular member 21 and two dome members 22 and 23 connected to both ends of the tubular member 21, and is a layer in which these are integrally formed. .. In the present embodiment, the dome member 22 is composed of a first resin layer 121 and a second resin layer 122 formed so as to cover the first resin layer 121, and the dome member 23 is a third resin layer. It is composed of 125.

Here, in the present embodiment, the dome member 22 includes a dome main body portion 22a and a cylindrical protruding portion 22b protruding from the dome main body portion 22a. The protruding portion 22b has a gas flow path 22c for filling and discharging hydrogen gas or the like. A metal valve fixture 14 is fixed to the outer peripheral surface of the protrusion 22b, and a metal valve for filling and discharging hydrogen gas into and discharging the accommodation space 17 on 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 crimped and fixed to the outer peripheral surface of the protrusion 22b. A thread 15a is formed on the inner surface of the valve 15 to engage with the thread 14b of the valve fixture 14, 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 to be inserted into the protrusion 22b. The insertion portion 15b is provided with a seal member 15c for sealing the accommodation space 17, and a passage 15d for passing hydrogen gas is formed.

The first resin layer 121 is formed by 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 main body 22a and a part of the protruding portion 22b, and is arranged so that the fibers are continuous from the protruding portion 22b to the dome main body 22a. Here, the first resin layer 121 is arranged so that the fibers are continuous from the protruding portion 22b to the peripheral edge portion of the dome main body portion 22a. Further, the first resin layer 121 is formed in the protruding portion 22b so that the fiber direction is along the axial direction X of the protruding portion 22b (here, parallel to the axial direction X). 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 by a fiber bundle F2 (second fiber bundle) impregnated with a second resin made of a thermosetting resin. The second resin layer 122 is formed so as to cover the first resin layer 121. Further, the second resin layer 122 is formed so that the fiber directions of the second resin layer 122 intersect with the fiber directions of the first resin layer 121.

The outer reinforcing layer 13 is formed so as 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 composed of resin and fibers (continuous fibers). In the outer reinforcing layer 13, the fibers are oriented so as to be parallel to the axial direction X of the tubular member 21 or inclined by 45 degrees or less, and the fibers are oriented over the two dome members 22 and 23 via the tubular member 21. It is oriented. This fiber prevents the dome members 22 and 23 from moving outward in the axial direction X, and prevents the dome members 22 and 23 from coming off the tubular member 21 to the outside in the axial direction X due to gas pressure.

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 manufacturing method of 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 tubular member forming step S3, a joining step S4, and an outer reinforcing layer forming step S5. It is composed of. Although it is described in FIG. 2 that the liner preparation step S1, the dome member forming step S2, and the tubular member forming step S3 are performed in this order, the liner preparing step S1, the dome member forming step S2, and the tubular member forming step S3 are described. Are independent processes, and therefore may be performed in parallel, or any process may be performed first.

In the liner preparation step S1, as shown in FIG. 1, a cylindrical cylinder portion and dome portions at both ends of the cylinder portion are provided, and one dome portion has a gas flow path connecting the inside and the outside. A liner 11 having a cylindrical protrusion is prepared. The method for producing the liner 11 is not particularly limited, and the liner 11 can be produced by 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 the dome member 23 can also be formed at the same time. Further, the dome member 23 can be formed by a process different from that of the dome member 22. Here, a method of forming the dome member 22 and the dome member 23 in different steps will be described, and then a method of forming the dome member 22 and the dome member 23 at the same time will be described.

In the first resin layer forming step S21, as shown in FIG. 4, the first resin layer 121 is formed on the outer surface of the mandrel 200. Specifically, the mandrel 200 has a dome-shaped main body portion 201 and a shaft portion 202 extending outward from the main body portion 201. Then, for example, using the tape placement method as shown in FIG. 5, the fiber bundle F1 impregnated with the thermoplastic resin is attached to the outer surface of the mandrel 200 while being pressed by the pressure roller 210. At this time, the fiber bundle F1 is attached (arranged) to the mandrel 200 in a state where the resin impregnated in the fiber bundle F1 is heated and softened using a laser device (not shown). The resin impregnated in the attached fiber bundle F1 is immediately solidified when heat is taken by the mandrel 200. As described above, by using the fiber bundle F1 impregnated with the thermoplastic resin, the resin impregnated in the attached fiber bundle F1 can be immediately solidified. Therefore, while applying tension to the fiber bundle F1. Can be pasted. Therefore, since the fiber directions of the fiber bundles F1 are aligned, it is possible to suppress a decrease in the tensile strength of the first resin layer 121. Further, the fiber bundle F1 may be blown with cooling air so that the thermoplastic resin impregnated in the fiber bundle F1 solidifies faster. The material of the mandrel 200 is not particularly limited, but is preferably a metal in order to secure strength that does not deform when the fiber bundle F1 and the fiber bundle F2 described later are arranged.

Here, the fiber bundle F1 is arranged so as to be continuous from the main body portion 201 of the mandrel 200 to the shaft portion 202. In the present embodiment, the fiber bundle F1 is arranged so as to be continuous from the peripheral edge portion of the main body portion 201 to the shaft portion 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 radiate (diameterally) from the shaft portion 202 of the mandrel 200.

In the second resin layer forming step S22, the second resin layer 122 is formed on the outer surface of the mandrel 200 so as to cover the first resin layer 121 (that is, the fiber bundle F1 impregnated with the first resin) from the state shown in FIG. (See FIG. 7) is formed. Since the state in which the second resin layer 122 is formed so as to cover the first resin layer 121 from the state shown in FIG. 4 is the same as a part of FIG. 7 described later, the figure is omitted here. When forming the second resin layer 122, for example, as in the case of the first resin layer 121, the tape placement method is used, and the pressure roller 210 covers the outer surface of the mandrel 200 so as to cover the outer surface of the mandrel 200. The fiber bundle F2 impregnated with the second resin of No. 2 may be attached while being pressed. Further, at this time, the fiber bundle F2 is arranged so that the fiber direction of the fiber bundle F2 intersects the fiber direction of the fiber bundle F1.

Then, the second resin layer 122 (that is, the uncured thermosetting resin impregnated in 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 the 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 changes, so that the second resin layer 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 prevent the first resin of the first resin layer 121 from softening when the second resin layer 122 is cured, and the fibers contained in the first resin layer 121 may bend. It is possible to suppress the misalignment.

In the removal step S23, the first resin layer 121 and the second resin layer 122 are removed from the mandrel 200. As a result, the dome member 22 is formed. By removing the second resin layer 122 from the mandrel 200 after heating and curing the second resin layer 122 in this way, the deformation of the second resin layer 122 can be suppressed.

When the dome member 23 is formed in a process different from that of 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 which 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 sticking the fiber bundle impregnated with the third resin made of the thermosetting resin by using the tape placement method. can do. Then, the third resin layer 125 is heated and cured. After that, 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 polyetheretherketone, polyphenylene sulfide, polyacrylic acid ester, polyimide, polyamide and the like can be used.

The thermosetting resin contained in the second resin layer 122 and the third resin layer 125 is not particularly limited, but is a thermosetting resin such as a phenol resin, a melamine resin, a urea resin, and an epoxy resin. Is preferable, and in particular, an epoxy resin is preferably used from the viewpoint of mechanical strength and the like. Generally, the epoxy resin is a resin obtained by mixing a prepolymer such as a copolymer of bisphenol A and epichlorohydrin and a curing agent such as polyamine and thermosetting. Epoxy resin is fluid in the uncured state and forms a tough crosslinked structure after thermosetting.

Further, as the fibers contained 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 and the like can be used, and in particular, the weight is reduced. It is preferable to use carbon fiber from the viewpoint of mechanical strength and the like.

Next, a case where the dome member 23 is formed at the same time as the dome member 22 (same process) will be described. In this method, the third resin layer 125 is formed by the fiber bundle F2.

In the first resin layer forming step S21, the mandrel 200 as shown in FIG. 6 is used. In this mandrel 200, the main body 201 is formed in 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 attaching the fiber bundle F2 using the tape placement method described above, but for example, the fiber bundle F2 can be wound by using the filament winding method (FW method). The second resin layer 122 can be formed by the above. Specifically, the shaft portion 202 of the mandrel 200 is attached to a rotating 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 the axial direction X of the shaft portion 202 by, for example, 40 degrees or more. Then, the thermosetting resin impregnated in the fiber bundle F2 is heated and cured.

In the removing step S23, the wound body (fiber bundle F2) wound around the outer surface of the mandrel 200 is divided into two pieces by using a cutter (not shown) along the alternate long and short dash line L in FIG. After that, the two dome members 22 and 23 are formed by separating the divided winding body from the mandrel 200.

In the present embodiment, after the removal step S23, the valve fixture 14 is crimped and fixed to the protruding portion 22b. 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 the second resin layer 122 is heat-cured. In this case, the valve fixture 14 can be firmly fixed to the protrusion 22b.

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

Inside the cylindrical type 300, an unwinding roller 310 of an unwinding device (not shown) for unwinding the roll-shaped fiber sheet F3 is provided. By unwinding the fiber sheet F3 while rotating the cylindrical mold 300, the fiber sheet F3 is attached to the inner surface of the cylindrical mold 300, and the tubular member 21 is formed.

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

The fiber sheet F3 includes, for example, a so-called UD (Uni-Orthogonal) sheet in which a plurality of fiber bundles aligned in a single direction are woven with a restraint thread, a plurality of fiber bundles aligned in a single direction, and a plurality of these. A fiber sheet in which a plurality of orthogonal fiber bundles are woven, for example, which intersects the fiber bundles of the above, and which is pre-impregnated with a resin can be used.

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

As the fibers constituting the fiber sheet F3, glass fibers, aramid fibers, boron fibers, carbon fibers and the like can be used as in the case of the fiber bundles F1 and F2, and in particular, carbon is used from the viewpoint of light weight, mechanical strength and the like. It is preferable to use fibers.

As shown in FIG. 1, the tubular member 21 formed on the inner surface of the cylindrical 300 is formed so that the thickness at both ends in the axial direction X gradually decreases. Similarly, the dome members 22 and 23 are also formed so that the thickness of the peripheral edge portion gradually decreases. As a result, in a state where the tubular member 21 and the two dome members 22 and 23 are combined, a step is less likely to be formed at the connecting portion between the outer surface of the tubular member 21 and the outer surfaces of the two dome members 22 and 23.

In order to gradually reduce the thickness of both ends of the tubular member 21 in the axial direction X, the end portion of the fiber sheet F3 in the axial direction X (width direction) is a fiber bundle so that the thickness of the fiber bundle gradually decreases. Is preferably woven. Further, the thickness may be gradually reduced by pressing both ends of the tubular member 21 in the axial direction X with a roller or the like. Further, in order to gradually reduce the thickness of the peripheral edges of the dome members 22 and 23, the number of windings and the winding direction of the fiber bundle F2 may be adjusted, or the peripheral edges may be pressed by a roller or the like.

Then, after the tubular member 21 is heated and cured, the tubular member 21 is removed from the inside of the cylindrical type 300. As a result, deformation of the tubular member 21 when the tubular member 21 is removed from the cylindrical mold 300 can be suppressed.

Here, an example of forming the tubular member 21 on the inner surface of the cylindrical type 300 has been described, but the tubular member 21 can also be formed by other methods. For example, the tubular member 21 may be formed by attaching the fiber sheet F3 to the outer surface of the cylindrical type or by hoop-wrapping a fiber bundle impregnated with the third resin on the outer surface of the cylindrical type by the FW method. ..

Further, since the dome members 22 and 23 are formed by using the mandrel 200 and the tubular member 21 is formed by using the cylindrical type 300, the tubular member 21 and the dome member 22 are formed without directly winding a fiber bundle or the like around the liner 11. And 23 are formed. As a result, the winding tightening force due to hoop winding, helical winding, or the like does not act on the liner 11, so that the strength of the liner 11 does not have to be increased so that the liner 11 is not deformed due to the winding tightening force. Therefore, since the thickness (thickness) of the liner 11 can be reduced, 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 edges 21a at both ends of the tubular member 21 and the peripheral edges 22d and 23a of the two dome members 22 and 23 are joined to reinforce as a reinforcing layer. Form the body 20.

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

The peripheral edges 22d and 23a of the dome members 22 and 23 may be on the outside, and the peripheral edges 21a on both ends of the tubular member 21 may be on the inside for fitting. Peripheral portions 21a at both ends of the tubular member 21 may be abutted and joined. Further, an adhesive (not shown) may be arranged between the tubular member 21 and the dome members 22 and 23.

In the outer reinforcing layer forming step S5, the outer reinforcing layer 13 in which the fibers are arranged over the two dome members 22 and 23 is formed by the fiber reinforced resin 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. Further, the outer reinforcing layer 13 may be formed by attaching a plurality of fiber bundles impregnated with the thermosetting resin to the outer surface of the reinforcing body 20 in a state of extending in the axial direction X of the reinforcing body 20. The outer reinforcing layer 13 may be formed by 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 cured. As the thermosetting resin and the fiber bundle contained in the outer reinforcing layer 13, for example, the same thermosetting resin and the fiber bundle 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. Here, an example in which the valve 15 is attached to the protrusion 22b via the valve fixture 14 has been shown, but 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 crimped and fixed 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 at the protruding portion 22b of the first resin layer 121 will be described. As shown in FIG. 11, 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) and the tensile strength in the axial direction X is standardized as 100, the fibers are standardized. When the direction is tilted by 10 degrees, 20 degrees, and 30 degrees (80 degrees, 70 degrees, and 60 degrees in FIG. 11, respectively) with respect to the axial direction X, the tensile strength decreases to about 90, 65, and 33 degrees. Since the angle that can be formed by the FW method is usually 0 to 30 degrees in FIG. 11, if the protruding portion 22b is formed by the FW method, the tensile strength becomes about 8.

In the present embodiment, the first resin layer 121 is formed in the protruding portion 22b so that the fiber direction is along the axial direction X of the protruding portion 22b. Specifically, the inclination angle of the fiber direction with respect to the axial direction X is It is formed so as to be 20 degrees or less, preferably 10 degrees or less, more preferably 0 degrees (70 degrees or more, 80 degrees or more, 90 degrees, respectively) in FIG. As a result, the tensile strength of the protruding portion 22b can be sufficiently secured.

In the present embodiment, as described above, the fiber bundle F1 is arranged in the protruding portion 22b so that the fiber direction is along the axial direction X of the protruding portion 22b. Thereby, the tensile strength in the axial direction of the protruding portion 22b can be secured. Further, the fiber bundle F1 is arranged so as to be continuous from the protruding portion 22b to the dome main body portion 22a, and the fiber bundle F2 is arranged so as to cover the fiber bundle F1. As a result, the fiber bundle F2 can restrain the movement of the fiber bundle F1 and prevent the protruding portion 22b from coming out of the dome main body portion 22a. Further, since the fiber bundle F2 is provided so that the fiber direction of the fiber bundle F2 intersects the fiber direction of the fiber bundle F1, not only the tensile strength in the axial direction X but also the tensile strength in other directions such as the radial direction. Can be secured. Therefore, the inside of the high-pressure tank 10 becomes high pressure, and a large force is applied to the valve 15 attached to the tip of the protrusion 22b to the outside of the axial direction X, so that the protrusion 22b also receives a large force to the outside of the axial direction X. Even when it is added, it is possible to prevent the protrusion 22b from being damaged. Therefore, since it is not necessary to provide a base, the weight of the high pressure tank 10 can be reduced.

Further, as described above, the resin impregnated in the fiber bundle F1 is made of a thermoplastic resin, and the first resin impregnated in the fiber bundle F2 is made of a thermosetting resin. In this way, by making the first resin impregnated in the fiber bundle F1 a thermoplastic resin, the fiber bundle F1 is arranged on the surface of, for example, a mandrel or a liner 11 in a state where the first resin is softened. The heat of the bundle F1 is taken away by the mandrel 200 and the liner 11, and the resin impregnated in the fiber bundle F1 solidifies. As a result, the fiber bundle F2 is arranged on the fiber bundle F1 in the state where the first resin is solidified. Therefore, when the fiber bundle F2 is arranged, the fiber bundle F1 does not bend or shift in position, so that it is possible to suppress a decrease in the tensile strength of the protruding portion 22b in the axial direction X. Further, by changing the second resin impregnated in the fiber bundle F2 to a thermosetting resin, 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 in contact with hydrogen gas as described later) are formed by the fiber bundle F1 impregnated with the thermoplastic resin. An example of doing so will be described.

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

In the present embodiment, the dome member 22 is composed of a first resin layer 121 and a second resin layer 122 formed so as to cover the first resin layer 121. Unlike the first embodiment, the first resin layer 121 is formed over the entire inner surface (the surface in contact with hydrogen gas, that is, the inner surface of the dome main body 22a and the inner surface of the protruding portion 22b).

Further, unlike the first embodiment, the dome member 23 is composed of a fourth resin layer 126 and a third resin layer 125 covering 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 (surface in contact with hydrogen gas).

That is, since the dome members 22 and 23 have a gas barrier property over the entire inner surface and have the same function as the dome-shaped both ends of the liner 11 of the first embodiment, in the present embodiment, the liner 11 is formed in a cylindrical shape with both ends open. Then, the cylindrical liner 11, the first resin layer 121, and the fourth resin layer 126 form a storage space 17 filled with hydrogen gas.

The other structures of the second embodiment are the same as those 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 the present embodiment, in the liner preparation step S1, a cylindrical liner 11 having both ends open is prepared. The method for producing the liner 11 is not particularly limited, and the liner 11 can be produced by using a known technique.

Similar to the first embodiment, 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. There is.

In the first resin layer forming step S21, as shown in FIG. 13, the first resin layer 121 is formed so as 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 radiate (diameterally) from the shaft portion 202 of the mandrel 200, for example, in the state shown in FIGS. 4 and 6. Therefore, the fiber bundles F1 may be further 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 the fourth resin layer 126 of the dome member 23 is formed, 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 protruding portion 22b, the shaft of the mandrel 200 It is not necessary to provide the fourth resin layer 126 so as to radiate from the portion 202. Further, as in the first embodiment, the dome member 23 can be formed at the same time as the dome member 22 (in the same process).

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

In the present embodiment, as described above, when the dome members 22 and 23 are formed, the surfaces of the dome members 22 and 23 that come into contact with hydrogen gas are formed by the fiber bundle F1. Since the thermoplastic resin has a gas barrier property, the surfaces of the dome members 22 and 23 that come into contact with hydrogen gas are formed by the fiber bundle F1 impregnated with the thermoplastic resin along the inner surfaces of the dome members 22 and 23. It is not necessary to provide the liner 11 (both ends of the dome shape). As a result, the high pressure tank 10 can be further reduced in weight.

Other effects of the second embodiment are the same as those of the first embodiment.

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

In the high-pressure tank 10 of the present embodiment, as shown in FIG. 15, for example, a metal cylindrical insert 16 is arranged inside the protruding portion 22b of the dome member 22. In the present embodiment, the dome member 22 is formed so as to cover 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. It is composed of two resin layers 122.

The insert 16 has a female screw 16a on the inner peripheral surface. The insert 16 is arranged inside the first resin layer 121 of the dome member 22 so as to be adjacent to the axial tip of the cylindrical protrusion of the liner 11. The insert 16 has, for example, a cylindrical shape in which the inner end portion of the high-pressure tank 10 in the axial direction is tapered in diameter.

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

The other structures of the third embodiment are the same as those 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 for arranging the fiber bundle F1 (first fiber bundle), for example, the insert 16 having the female screw 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 circumference of the tip of the. Then, the fiber bundle F1 is arranged on the outer circumference of the insert 16 and the outer circumference of the mandrel 200.

The 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, as in FIG. 4 or FIG. .. Here, the fiber bundle F1 constituting the first resin layer 121 is arranged so that the fiber direction of the insert 16 and the shaft portion 202 is along the axial direction X of the shaft portion 202 (here, as in the first embodiment). (Parallel to the axial direction X). As a result, in the first resin layer 121 of the protruding portion 22b shown in FIG. 15, the fiber bundle F1 is arranged along the axial direction of the protruding portion 22b (here, parallel to the axial direction of the protruding portion 22b). NS.

Further, in the second resin layer forming step S22 similar to the first embodiment described above, as shown in FIG. 16, the first resin layer 121 (that is, the fiber bundle F1 impregnated with the first resin) is covered. , 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 such that the fiber direction of the fiber bundle F2 intersects the fiber direction of the fiber bundle F1 at least on the outer circumference of the insert 16 and the outer circumference of the shaft portion 202 ( Here they are arranged (so that they intersect at right angles or at angles of 80 degrees or more).

Further, the fiber bundle F2 wound around the outer circumference of the insert 16 and the outer circumference of the shaft portion 202 is continuously wound from the outer circumference of the insert 16 and the outer circumference of the shaft portion 202 to the outer circumference of the dome-shaped mandrel 200. As a result, the second resin layer continuous from the protruding portion 22b of the dome member 22 shown in FIG. 15 to the dome-shaped portion by the fiber bundle F2 integrally wound from the insert 16 and the shaft portion 202 to the mandrel 200 with a single stroke. 122 is integrally wound and molded.

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

In such a conventional high-pressure tank 90, a thrust TF acting outward in the axial direction of the high-pressure tank 90 acts on the reinforcing layer 912 from the flange portion 921 of the base 92 that receives the internal pressure of the high-pressure tank 90. As shown in FIG. 18, such a thrust TF increases the stress acting on the fibers at the outer edge portion 921a of the flange portion 921 of the base 92 and the fiber intersection 921x on the flange portion 921 of the base 92. , A stress concentration portion SC is generated in the high pressure tank 900. Further, when the high-pressure tank 900 is filled at a low temperature, due to the difference in linear expansion coefficient between the reinforcing layer 912 and the base 92, as shown in FIG. 17, a tensile force PF is applied to the reinforcing layer 912 at the outer peripheral portion of the flange portion 921 of the base 92. In action, 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 female screw 16a on the inner peripheral surface. .. As a result, a high-pressure tank 10 in which the cylindrical insert 16 is arranged inside the protruding portion 11b of the dome member 22 and the insert 16 has a female screw 16a on the inner peripheral surface can be manufactured.

As a result, the male screw 18b on the outer peripheral surface of the valve 18 can be screwed into the female screw 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 such a 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, and the intersections of the fiber bundles F1 and F2 and the like are formed. Stress is prevented from concentrating on a specific part.

Therefore, even if the internal pressure P of the high-pressure tank 10 acts on the valve 18 and a tensile force exerted on the protruding portion 22b in the axial direction of the high-pressure tank 10 acts, stress concentration on a specific portion can be avoided, and the fiber. The strength utilization rate of the bundles F1 and F2 can be improved. Therefore, the amount of fiber bundles F1 and F2 used can be reduced, and the weight of the high-pressure tank 10 can be reduced. Further, by preventing stress concentration, damage to the liner 11 can be prevented.

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 be placed in the intermediate layer between the bundles F2. In this case, both sides of the fiber bundle F1 can be adhered to the fiber bundle F2.

Other effects of the third embodiment are the same as those of the first embodiment.

It should be noted that the embodiments disclosed this time are exemplary in all respects and are not considered to be restrictive. The scope of the present invention is shown by the scope of claims rather than the description of the above-described embodiment, and further includes all modifications within the meaning and scope equivalent to the scope of claims.

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

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

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

Further, in the above embodiment, the example in which the first resin layer 121 is arranged from the protruding portion 22b to the peripheral edge portion of the dome main body portion 22a has been described, but the present invention is not limited to this, and the first resin layer 121 is not limited to this. As long as it is arranged from the protruding portion 22b to the dome main body 22a, it does not have to be arranged to the peripheral edge of the dome main body 22a. That is, for example, as shown in FIG. 14, if the fiber bundle F1 is arranged from the shaft portion 202 to the main body portion 201 of the mandrel 200, it is not necessary to arrange the fiber bundle F1 to the peripheral edge portion of the main body portion 201.

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

Further, in the above embodiment, an example in which the tubular member and the dome member are arranged and joined so as to cover the liner after the liner is prepared has been described, but the present invention is not limited to this. For example, after joining the tubular member and the dome member to form a reinforcing body, a liner may be formed inside the reinforcing body. In this case, for example, a liner may be formed by a reaction injection molding method using two or more kinds of low molecular weight and low viscosity liquid materials having fluidity at room temperature as the resin material. Further, as in blow molding, a liner may be formed by extruding a heat-softened resin material into a tubular shape inside the reinforcing body and sending compressed air into the tubular resin material. Further, the liner 11 may be formed by spraying a liquid or softened resin material on the inner surface of the reinforcing body as in thermal spraying.

10: High pressure tank, 11: Liner, 16: Insert, 16a: Female screw, 20: Reinforcing body (reinforcing layer), 21: Cylindrical member, 22, 23: Dome member, 22a: Dome body, 22b: Protruding part, 22c : Gas flow path, F1: Fiber bundle (first fiber bundle), F2: Fiber bundle (second fiber bundle), X: Axial direction

Claims (7)

A liner for accommodating gas and a reinforcing layer made of a fiber reinforced resin covering the outer surface of the liner are provided, and the reinforcing layer is integrally composed of a tubular member and two dome members provided at both ends of the tubular member. The formed layer, one of which is a dome member, comprises a dome body and a cylindrical protrusion that projects from the dome body and has a gas flow path for filling and discharging gas. It is a method of manufacturing a high-pressure tank.
A step of forming at least one of the dome members is provided.
The step of forming at least one of the dome members is
A step of arranging the first fiber bundle impregnated with the first resin so as to form a part of the protruding portion and a part of the dome main body portion, and a step of arranging the first fiber bundle impregnated with the first resin.
A step of arranging the second fiber bundle impregnated with the second resin so as to cover the first fiber bundle, and
Including
In the step of arranging the first fiber bundle, the first fiber bundle is formed so that the fiber direction at the protruding portion is along the axial direction of the protruding portion and is continuous from the protruding portion to the dome main body portion. The first resin impregnated in the placed first fiber bundle was solidified while arranging.
In the step of arranging the second fiber bundle, the high pressure is characterized in that the second fiber bundle is arranged so that the fiber direction of the second fiber bundle intersects the fiber direction of the first fiber bundle. How to make a tank. The first resin is made of a thermoplastic resin and is made of a thermoplastic resin.
The second resin is made of a thermosetting resin and 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 in the arranged first fiber bundle is solidified.
According to claim 1, in the step of arranging the second fiber bundle, after arranging the second fiber bundle in a state where the second resin is uncured, the second resin is heated and cured. The method for manufacturing a high pressure tank described. The method for manufacturing a high-pressure tank according to claim 2, wherein when the two dome members are formed, a surface of the dome members in contact with the gas is formed by the first fiber bundle. A liner for accommodating gas and a reinforcing layer made of a fiber reinforced resin covering the outer surface of the liner are provided, and the reinforcing layer is integrally composed of a tubular member and two dome members provided at both ends of the tubular member. A formed layer, one of which is a high pressure tank comprising a dome body and a protrusion that projects from the dome body and has a gas flow path for filling and discharging gas. There,
The dome main body and the protruding portion are formed by a first fiber bundle impregnated with the first resin and a second fiber bundle impregnated with the second resin.
The first fiber bundle constitutes a part of the protruding portion and a part of the dome main body portion, and the fiber direction of the protruding portion is along the axial direction of the protruding portion, and the dome is formed from the protruding portion. It is arranged continuously up to the main body,
The second fiber bundle covers the first fiber bundle and is arranged so that the fiber directions of the second fiber bundle intersect with the fiber direction of the first fiber bundle. tank. The first resin is made of a thermoplastic resin and is made of a thermoplastic resin.
The second resin is made of a thermosetting resin and is made of a thermosetting resin.
The high-pressure tank according to claim 4, wherein the surface of the dome member that comes into contact with the gas is formed by the first fiber bundle. The method according to any one of claims 1 to 3, 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. How to make a high pressure tank. A tubular insert is placed inside the protrusion
The high-pressure tank according to claim 4 or 5, wherein the insert has an internal thread on the inner peripheral surface.

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