阅读说明：本技术 高压罐的制造方法和高压罐 (Method for manufacturing high-pressure tank and high-pressure tank ) 是由 八田健 于 2021-03-17 设计创作，主要内容包括：本公开涉及通过浸渍了树脂的纤维层加强的高压罐和高压罐的制造方法。在包括将碳纤维卷绕于衬里来在衬里的外周设置纤维层而形成预制件、并将固化性树脂浸渍于预制件的纤维层并使其固化的工序在内的高压罐的制造方法中,在将碳纤维卷绕于衬里时,将金属线与碳纤维一起卷绕于衬里。(The present disclosure relates to a high-pressure tank reinforced with a fiber layer impregnated with a resin, and a method for manufacturing the high-pressure tank. In a method for manufacturing a high-pressure tank including a step of winding carbon fibers around a liner to form a preform by providing a fiber layer on the outer periphery of the liner, and impregnating a curable resin into the fiber layer of the preform to cure the same, a metal wire is wound around the liner together with the carbon fibers when the carbon fibers are wound around the liner.)

1. A method of manufacturing a high-pressure tank, characterized in that,

the method for manufacturing the high-pressure tank comprises the following steps:

winding carbon fibers around a liner to form a preform, and providing a fiber layer on an outer periphery of the liner; and

impregnating the fiber layer of the preform with a curable resin and curing the curable resin,

wherein, when the carbon fiber is wound around the liner, a metal wire is wound around the liner together with the carbon fiber.

2. The method of manufacturing a high-pressure tank according to claim 1,

the winding of the carbon fibers and the metal wire is performed by a multi-strand filament winding device.

3. The method of manufacturing a high-pressure tank according to claim 1,

continuously passing the liner through a plurality of multi-ply filament winding devices to effect winding of the carbon fibers and the metal wire.

4. The method for manufacturing a high-pressure tank according to any one of claims 1 to 3,

the metal wire is made of a metal having a volume resistivity of 5.0 [ mu ] omega cm or less.

5. The method for manufacturing a high-pressure tank according to any one of claims 1 to 3,

the metal line is composed of a metal having a volume resistivity of more than 5.0 [ mu ] omega cm.

6. The method for manufacturing a high-pressure tank according to any one of claims 1 to 5,

the metal wires are disposed closer to the liner than a position that is half the thickness of the fiber layer.

7. The method for manufacturing a high-pressure tank according to any one of claims 1 to 6,

energizing the metal wire after the fiber layer of the preform is impregnated with the curable resin.

8. The method of manufacturing a high-pressure tank according to claim 7,

and energizing the metal wire when the heat generation temperature of the curable resin reaches a maximum.

9. A high-pressure tank is characterized in that,

the high-pressure tank is provided with:

a hollow liner; and

a reinforcing layer including a fiber layer and a resin impregnated in the fiber layer, the fiber layer including carbon fibers and metal wires wound around an outer periphery of the liner,

wherein the metal wires are disposed only at a position closer to the liner than a position that is a half of the fiber layer in the thickness direction.

Technical Field

The present disclosure relates to a high-pressure tank reinforced with a fiber layer impregnated with a resin, and a method for manufacturing the high-pressure tank.

Background

The high-pressure tank for a fuel cell vehicle has a liner forming an inner space of the high-pressure tank, and a reinforcing layer is formed by providing a fiber layer impregnated with a resin on an outer periphery of the liner, thereby achieving high strength. Examples of methods for producing such high-pressure tanks include japanese patent application laid-open No. 2008-132717, japanese patent application laid-open No. 2012-148544, japanese patent application laid-open No. 2018-012235, japanese patent application laid-open No. 2019-056415, and japanese patent application laid-open No. 2019-059176.

Jp 2008-132717 a discloses a method for producing a fiber-reinforced plastic in which a metal core is coated with a fiber, a base resin is impregnated into the coated fiber, or the core is coated with the fiber impregnated with the base resin, the base resin is heated to be precured, and the base resin is heated to be post-cured at a temperature higher than a temperature at which the base resin is precured, and a metal having a melting point higher than a heating temperature at the time of precuring and equal to or lower than the heating temperature at the time of post-curing is used as the metal core.

Jp 2012-148544 a discloses a method for manufacturing a high-pressure tank in which fibers impregnated with a thermosetting resin in advance are laminated, wherein a coil made of a copper wire or the like is wound around the inside and outside of a resin layer, and an electric current is passed through the copper wire to heat the thermosetting resin.

Jp 2018 a-012235 a discloses a method for manufacturing a high-pressure tank in which fibers impregnated with a thermosetting resin in advance are laminated, wherein a thin plate made of stainless steel or copper is provided on a fiber layer at a position where winding of the resin fiber is completed, and the resin is cured by heating.

Jp 2019 a-056415 a discloses a method of manufacturing a high-pressure tank, in which a preform having a fiber layer formed on an outer surface of a liner forming an internal space of the high-pressure tank is placed in a metal mold, and the preform is rotated in a circumferential direction in the metal mold with a central axis of the preform as a rotation center while injecting a resin toward the preform placed in the metal mold, thereby impregnating the fiber layer with the resin.

Jp 2019 a-059176 discloses a technique of impregnating a formed fiber layer with a resin, in which a gap is formed by providing a difference in thickness in a fiber bundle constituting the fiber layer, and the resin passes through the gap, thereby promoting penetration of the resin.

In so-called RTM (Resin Transfer Molding) in which a reinforcing layer is formed by impregnating a fiber layer of a preform (a member having a fiber layer formed on a liner) with a Resin composition and then curing the Resin composition, uniform Resin impregnation may be difficult depending on the thickness and shape of the fiber layer. In particular, in order to ensure strength, the high-pressure tank for a fuel cell vehicle has a thick fiber layer and a cylindrical shape that is long in the axial direction, and therefore the above-described problem is more significant.

On the other hand, when the resin is injected at a high pressure, the liner or the like is deformed by the pressure, and the equipment becomes large. On the other hand, when the resin is impregnated with the resin in a state in which the fluidity of the resin is improved, it takes time to cure the resin, and thus productivity is lowered.

Disclosure of Invention

The present disclosure provides a method for manufacturing a high-pressure tank, which can suppress a decrease in productivity and perform high-quality impregnation when resin is impregnated into a fiber layer. In addition, a high-pressure tank formed by the manufacturing method thereof is provided.

One embodiment of the present disclosure provides a method of manufacturing a high-pressure tank. The method for manufacturing the high-pressure tank comprises the following steps: winding carbon fibers around a liner to form a preform, and providing a fiber layer on an outer periphery of the liner; and impregnating the fiber layer of the preform with a curable resin and curing the curable resin. When the carbon fiber is wound around the liner, the metal wire is wound around the liner together with the carbon fiber.

The following may be configured: on the basis of the above embodiment, the winding of the carbon fibers and the metal wire is performed by one multi-strand filament winding device.

The following may be configured: in addition to the above embodiment, the carbon fibers and the metal wires are wound by continuously passing the liner through a plurality of multi-strand filament winding devices.

The following may be configured: in addition to the above embodiment, the metal wire is made of a metal having a volume resistivity of 5.0(μ Ω cm) or less.

The following may be configured: in addition to the above embodiments, the metal line is made of a metal having a volume resistivity of more than 5.0(μ Ω cm).

The following may be configured: in the above embodiment, the metal wire is disposed closer to the liner than the position that is half the thickness of the fiber layer.

The following may be configured: in addition to the above embodiments, the metal wires are energized after the fiber layer of the preform is impregnated with the curable resin.

The following may be configured: in addition to the above embodiments, the electric current is supplied to the metal wire when the curing heat generation temperature of the curable resin reaches the maximum.

Another aspect of the present disclosure provides a high pressure tank. The high-pressure tank is provided with: a hollow liner; and a reinforcing layer including a fiber layer and a resin impregnated in the fiber layer, wherein the fiber layer includes carbon fibers and metal wires wound around an outer periphery of the liner. The metal wires are arranged in the fiber layer only at a position closer to the liner than a position that is half of the fiber layer in the thickness direction.

According to the present disclosure, it is possible to perform high-quality immersion while suppressing a decrease in productivity, and it is possible to obtain a high-quality high-pressure tank while suppressing manufacturing costs.

Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like reference numerals refer to like elements.

Drawings

Fig. 1 is a diagram schematically showing an external appearance of a high-pressure tank 10.

Fig. 2A is a sectional view of the high-pressure tank 10.

Fig. 2B is a partially enlarged view of a cross section of the high-pressure tank 10 shown in fig. 2A.

Fig. 3A is a diagram illustrating the arrangement of the metal lines 13 b.

Fig. 3B is another diagram illustrating the arrangement of the metal line 13B.

Fig. 4 is a diagram illustrating a state in which the wire 13b is wound.

Fig. 5 is a diagram illustrating a method S10 for manufacturing the high-pressure tank.

Fig. 6A is a diagram illustrating step S11 of forming a fiber layer.

Fig. 6B is another diagram illustrating step S11 of forming a fiber layer.

Fig. 7A is a diagram illustrating the mold 45.

Fig. 7B is another diagram illustrating the mold 45.

Fig. 8 is a diagram illustrating step S13 of stopping the supply and stop of the resin composition.

Fig. 9 is a diagram illustrating the energization step S14.

Fig. 10 is a diagram for explaining an example of timing of start of energization.

Fig. 11 is a diagram illustrating step S21 of forming a fiber layer.

Detailed Description

1. Embodiment mode 1

1.1. Structure of high-pressure tank

Fig. 1 schematically shows an external appearance of a high-pressure tank 10 according to embodiment 1, and fig. 2A schematically shows a cross section of the high-pressure tank 10 along an axis. Fig. 2B is a part of the cross section of fig. 2A, and is a diagram illustrating a layer structure provided in the high-pressure tank 10. As can be seen from these figures, the high-pressure tank 10 has a liner 11, a reinforcing layer 12, a protective layer 15, and a joint 16. The respective configurations will be explained below.

< liner >

The liner 11 is a hollow member that partitions the internal space of the high-pressure tank 10. The liner may be made of a material capable of holding the gas (e.g., hydrogen) contained in the internal space thereof without leakage, and a known material may be used, but the liner is made of a metal such as nylon resin, polyethylene-based synthetic resin, stainless steel, or aluminum. The thickness of the liner 11 is not particularly limited, but is preferably 0.5mm to 1.0 mm.

< reinforcing layer >

The reinforcing layer 12 has a fiber layer 13 and a resin impregnated and cured in the fiber layer 13. The fiber layer 13 is configured by winding several layers of fiber bundles 13a to a predetermined thickness on the outer surface of the liner 11 and at the same time winding a metal wire 13b partially thereon. The thickness of the reinforcing layer 12 is determined according to the required strength, and is not particularly limited, but is about 10mm to 30 mm. In particular, in order to ensure strength, the high-pressure tank for a fuel cell vehicle needs to have a thick reinforcing layer, and impregnation is difficult from the viewpoint of impregnation of the resin into the fiber layer that becomes thick. In the fiber layer 13, a portion extending from a half of the thickness of the fiber layer 13 toward the liner 11 may be referred to as an "inner layer side", and a portion extending from a half of the thickness toward the side opposite to the liner 11 (outer circumferential side) may be referred to as an "outer layer side".

Carbon fibers are used for the fiber bundles 13a of the fiber layer 13, and the fiber bundles 13a are ribbon-shaped bundles of carbon fibers having a predetermined cross-sectional shape (for example, a rectangular cross-section). Specifically, the cross-sectional shape is a rectangle having a width of 6mm to 9mm and a thickness of about 0.1mm to 0.15mm, but is not particularly limited thereto. The amount of carbon fibers contained in the fiber bundle is not particularly limited, and may be, for example, about 36000 carbon fibers. The fiber layer 13 is formed by winding a fiber bundle 13a formed of such carbon fibers around the outer surface of the liner 11.

The metal wires 13b of the fiber layer 13 are made of a conductive metal, and in the present embodiment, the metal wires 13b are made of a metal having low electrical resistance because the carbon fibers constituting the fiber bundle are inductively heated by flowing a current to the metal wires 13b as described later. Specifically, the conductive wire is preferably made of a material which is generally used as a conductive wire and has a volume resistivity of 5.0(μ Ω cm) or less at 100 ℃.

The metal wires 13b are disposed on the inner layer side of the fiber layer 13, and preferably disposed on the layer closest to the liner 11 (so-called layer 1, layer in contact with the liner). Fig. 3A and 3B schematically show a state in which the metal wire 13B is wound around the liner 11 in a perspective view. As described above, the metal wires 13b are not visible from the external appearance because they are disposed on the inner layer side of the fiber layer 13, but are seen through with broken lines for convenience. Fig. 3A is a view of the external appearance of the high-pressure tank 10, and fig. 3B is a cross-sectional view of the high-pressure tank 10. Fig. 4 is a view showing a state in which the metal wire 13b is wound together with the fiber bundle 13a when viewed from the outer peripheral side in front view. As is clear from these figures, the metal wire 13b is wound around the liner 11 in a spiral or coil shape. Thus, as described later, the carbon fibers of the fiber layer 13 can be inductively heated by flowing a current thereto. As is apparent from fig. 4, in this wound state, the metal wire 13b is formed so as to be woven by being repeatedly inserted under and arranged on the adjacent fiber bundle 13 a. The cross-sectional shape of the metal wire 13b is not particularly limited, and may be the same as or different from the fiber bundle 13 a. The winding angle of the fiber bundle 13a is preferably equal to (phase of) the winding angle of the wire 13 b. Thereby enabling the carbon fibers to be heated more efficiently by the metal wires.

The metal line 13b may be disposed at least on the inner layer side, but may be disposed only on the inner layer side. As a result, the outer layer side of the resin-impregnated fiber layer can be efficiently heated and cured by the mold and the inner layer side by the energization to the metal wire 13b, as will be described later.

The resin impregnated and cured in the fiber layer 13 in the reinforcing layer 12 is not particularly limited as long as it is a resin that can improve the strength of the fiber layer by first permeating the fiber layer in a state having fluidity and then curing by a certain method. Examples of the thermosetting resin include thermosetting resins that are cured by heat, for example, epoxy resins and unsaturated polyester resins in which an amine-based or anhydride-based curing accelerator and a rubber-based reinforcing agent are present. In addition, a resin composition which is cured by mixing an epoxy resin as a main agent and a curing agent is also included. According to this configuration, the resin composition as the mixture reaches and permeates the fiber layer during the period from the mixing of the main agent and the curing agent to the curing, and thereby is automatically cured.

< protective layer >

The protective layer 15 is disposed on the outer periphery of the reinforcing layer 12, and is formed by winding glass fibers and impregnating resin therein. The impregnated resin can be considered in the same manner as the reinforcing layer 12. This can impart impact resistance to the high-pressure tank 10. The thickness of the protective layer 15 is not particularly limited, but may be about 1.0mm to 1.5 mm.

< joint >

The joint 16 is a member attached to each of the two opening ends of the liner 11, and one of them functions as an opening for communicating the inside and outside of the high-pressure tank 10 and also functions as an attachment portion for attaching a pipe or a valve to the high-pressure tank 10. The joint 16 also functions as a mounting portion for mounting the liner 11 to a multi-strand filament winding device to be described later when forming the reinforcing layer 12.

1.2. Structure of prefabricated member

The preform 30 is an intermediate member that is to be eventually formed into the high-pressure tank 10, and is configured to have at least the liner 11 and the fiber layer 13. The preform 30 is thus a part before impregnation of the fiber layer 13 of the reinforcing layer 12 with resin. Therefore, the preform 30 has the same structure as described above, and the description of each structure is omitted. Note that, although the preform 30 is described as a member in which the fiber layer 13 is disposed on the liner 11, a member in which glass fibers for the protective layer 15 are further wound around the outer periphery of the fiber layer 13 may be used.

1.3. Production method 1

Fig. 5 shows a flow of a method S10 for manufacturing a high-pressure tank according to an embodiment. As is apparent from fig. 5, the method S10 for manufacturing a high-pressure tank includes a step S11 of forming a fiber layer, a step S12 of setting a preform in a mold and degassing a cavity, a step S13 of stopping supply and stop of a resin composition, a step S14 of applying electricity, and a step S15 of releasing the preform. The respective steps will be explained below.

< Process S11 for Forming fiber layer

Step S11 of forming a fiber layer (in some cases, step S11) forms the fiber layer 13 on the outer periphery of the liner 11 to form the preform 30. Fig. 6A and 6B are views for explaining step S11 of forming the fiber layer. Fig. 6A schematically shows a scenario of winding of the fiber bundle 13a and the metal wire 13B of the layer including the metal wire 13B, and fig. 6B schematically shows a scenario of winding of the fiber bundle 13a of the layer not including the metal wire 13B.

As is apparent from fig. 6A and 6B, in the present embodiment, the fiber layer 13 is formed by a filament winding method. In the present embodiment, the fiber layer 13 is formed using 1 multi-strand filament winding device (hereinafter, sometimes referred to as a "multi-strand FW device") in which a plurality of fiber bundle bobbins 40, which are bobbins around which the fiber bundles 13a are wound, are arranged so as to surround the liner 11 along the outer periphery of the liner 11.

More specifically, in the multi-strand FW device including the plurality of fiber bundle bobbins 40 arranged around the liner 11, when the layer including the metal wire 13b is formed, as shown in fig. 6A, at least one of the plurality of fiber bundle bobbins 40 is changed to a metal wire bobbin 41 which is a bobbin around which the metal wire 13b is wound, and the fiber bundle 13a and the metal wire 13b are sequentially drawn from the fiber bundle bobbin 40 and the metal wire bobbin 41 and wound around the outer periphery of the liner 11. The winding method is known as such, but at least the metal 13b is wound in a spiral coil shape as described above. Further, since the wire 13b is disposed on the inner layer side of the fiber layer 13 closer to the liner 11 as described above, the winding including the wire bobbin 41 is performed at an earlier stage (first in the 1 st layer) in the winding step.

On the other hand, when forming a layer not including the metal wire 13B, as shown in fig. 6B, all the bobbins are the fiber bundle bobbins 40, and the fiber bundles 13a are sequentially drawn from the fiber bundle bobbins 40 and wound around the outer periphery of the liner 11. The winding method is known as such. The change from fig. 6A to fig. 6B is only required to be changed from the wire spool 41 to the fiber bundle spool 40.

The number of bobbins that can be provided at the same time in the multi-strand FW device is not particularly limited, but there is also a device in which 48 bobbins can be provided, for example. At this time, when winding the layer including the metal wire 13b, the liner 11 can be wound in such a manner that 47 fiber bundle bobbins 40 and one metal wire bobbin 41 surround the liner.

Furthermore, the glass fibers for the protective layer 15 may also be wound continuously following the fiber layer 13.

< Process S12 for setting preform in mold and degassing cavity

In step S12 (sometimes referred to as "step S12") of setting the preform in the mold and degassing the cavity, the preform 30 produced in step S11 is set in the mold and degassed by evacuation. By this deaeration, the impregnated resin composition easily permeates into the fiber layer 13, and the impregnation is performed more smoothly.

Fig. 7A and 7B are views illustrating the mold 45. Fig. 7A is a schematic exploded sectional view of the mold 45 shown together with the preform 30, and fig. 7B is a schematic sectional view of the mold 45 in a state where the preform 30 is set. The mold 45 is a mold for impregnating the fiber layer 13 of the preform 30 with resin, and in the present embodiment, includes an upper mold 46 and a lower mold 47. An inner space along the shape of the preform 30 is formed inside the mold 45 by overlapping the upper mold 46 and the lower mold 47. The inner space can be evacuated, so that a closed space can be formed.

As indicated by a straight arrow in fig. 7B, the upper die 46 can be moved relative to the lower die 47, whereby the preform 30 can be set in the die 45 and the preform 30 can be separated (demolded) from the die 45.

In addition, the upper die 46 is provided with a flow path 46a reaching from the outside to the fiber layer 13 of the preform 30 provided. The resin composition is supplied to and impregnated into the fiber layer 13 by flowing the resin composition into the flow path 46 a. The mold 45 is also provided with an air flow passage (not shown) for evacuating (vacuum degassing) the formed internal space.

Further, the mold 45 is provided with a connection terminal 45a for current supply so as to be able to supply current to the metal wires 13b arranged in the fiber layers 13 of the preform 30.

The mold 45 is configured to be able to maintain its temperature at a desired temperature by a temperature control device, not shown.

The material for the mold 45 is not particularly limited, but it is generally preferable to use a metal, and the mold 45 is a so-called metal mold.

In step S12, the upper mold 46 of the mold 45 is released from the lower mold 47 and opened, the preform 30 is set on the lower mold 47 whose upper surface is largely exposed, and thereafter the upper mold 46 is arranged to cover the lower mold 47 and the preform 30 set therein and fastened. Further, vacuum degassing was performed by a vacuum pump. The vacuum degassing is completed before the resin composition is supplied to the fiber layer 13 in the next step.

< Process S13 for stopping supply and stop of resin composition

In step S13 (in some cases, described as "step S13") in which the supply and stop of the resin composition are performed, the resin composition before curing is supplied to the fiber layer 13 of the preform 30 disposed in the mold 45, and the supply is stopped by supplying a necessary amount of the resin composition. Whereby the resin composition is impregnated in the fiber layer 13.

The resin composition is not particularly limited as long as it can reach and permeate the fiber layer in a state of having fluidity and then be cured by a certain method to improve the strength of the fiber layer. Examples of the thermosetting resin include thermosetting resins that are cured by heat, for example, epoxy resins and unsaturated polyester resins in which an amine-based or anhydride-based curing accelerator and a rubber-based reinforcing agent are present. In addition, a resin composition which is cured by mixing an epoxy resin as a main component and a curing agent is exemplified. According to this configuration, the resin composition as the mixture reaches and permeates the fiber layer during the period from the mixing of the main agent and the curing agent to the curing, and thereby is automatically cured.

In the present disclosure, as will be described later, the carbon fibers of the fiber layer 13 are inductively heated by applying current to the metal wires 13 b. Since the curing of the resin composition can be accelerated, the resin composition is supplied in a high-flowability state in step S13, and the impregnation of the fiber layer 13 with the resin composition can be made faster and more reliable (rapid impregnation to the layer in contact with the liner 11).

< step S14 of energization

In the energization step S14, as shown in fig. 9, the metal wires 13b included in the fiber layer 13 are energized using the energization connecting terminals 45 a. Thus, the metal wire 13b functioning as a heating coil inductively heats the carbon fiber as a conductive material constituting the fiber bundle 13a, thereby accelerating the curing.

Since the metal wires 13b are disposed on the inner layer side of the fiber layer 13 closer to the liner 11, the curing can be accelerated by the electric heating even on the inner layer side where the curing tends to be slow due to the heat from the mold 45 being hard to be transmitted. In step S13, even if the resin composition is supplied under high fluidity conditions for more smooth impregnation, the solidification is accelerated by the energization in step S14, so that the impregnation speed can be increased together with the solidification speed, and the productivity of the high-pressure tank can be improved. In addition, more reliable impregnation and curing are also achieved, and therefore the quality of the high-pressure tank also becomes sufficient.

The timing of heating by energization to the metal wire 13b is not particularly limited, but energization may be started when the highest temperature of heat generation by curing of the resin composition is reached. That is, a temperature sensor may be provided in the liner 11, and as shown in fig. 10, the relationship between time and temperature may be obtained, and power supply (heating) may be started at a position where the highest temperature indicated by P in fig. 10 is reached. This makes it possible to start acceleration of curing after sufficient immersion is confirmed, such that heat is transferred to the liner 11 side, and thus, immersion can be performed more reliably.

< Process S15 for demolding preforms

In step S15 of releasing the preform (in some cases, described as "step S15"), the resin composition is cured in step S14, so that the resin composition impregnated into the fiber layer 13 is cured, and the preform 30 impregnated with the resin is released from the mold 45. In the present embodiment, the upper mold 46 of the mold 45 is released from the lower mold 47 and opened to perform mold release.

[ Effect and others ]

The preform 30 impregnated with the resin is obtained by the manufacturing method including the above steps. The high-pressure tank is formed by forming a layer of glass fibers impregnated with resin on the preform 30 impregnated with the resin.

According to the present disclosure, in the technique of impregnating a fiber layer with a resin by the RTM impregnation technique, a metal wire such as a copper wire is wound around a part of a layer made of carbon fibers on the inner layer side of the fiber layer by a multi-strand FW apparatus to form a heating coil, whereby heating can be performed from the inner layer side during resin impregnation, and thus both high-speed impregnation and high-speed curing can be achieved. That is, in the resin impregnation of the fiber layer, the resin composition is fluidized at a low temperature (low viscosity) in the fiber layer, and in the curing, the resin composition on the outer layer side can be heated by heat from the mold, and the resin composition on the inner layer side can be heated by the fiber layer that is inductively heated, so that the rapid curing and the reliable impregnation can be achieved at the same time, the cost can be suppressed, and a high-performance and high-quality high-pressure tank can be obtained.

In the present embodiment, since the heating coil formed of the metal wire is an induction heating method, the entire fiber layer can be heated.

1.4. Production method 2

Here, a method S20 for manufacturing a high-pressure tank according to another embodiment will be described. In the method S20 for manufacturing a high-pressure tank, the method S10 for manufacturing a high-pressure tank described with reference to fig. 5 differs in that a different step for forming a fiber layer (described as "step S21 for forming a fiber layer") is used instead of the step S11 for forming a fiber layer. Steps S12 to S15, which are subsequent steps, are the same as the method S10 for manufacturing the high-pressure tank, and therefore, description thereof is omitted here. The step S21 will be explained below.

< Process S21 for Forming fiber layer

Step S21 of forming a fiber layer (in some cases, step S21) forms a fiber layer on the outer periphery of the liner 11, and produces a preform 30. Fig. 11 shows a diagram for illustration.

In the present embodiment, the fiber layer 13 is formed by a filament winding method, but the fiber layer 13 is formed by a continuous multi-strand FW device in which a plurality of multi-strand FW devices are aligned. In this embodiment, as shown in fig. 11, a plurality of multi-strand FW devices 50a to 50f are arranged. These respective multi-strand FW devices are the same as those described with reference to fig. 6A and 6B.

In the present embodiment, a plurality of multi-strand FW devices are arranged so that the plurality of multi-strand FW devices are wound in layers so as to be responsible for different layers. Thus, as shown in fig. 11, liner 11 is moved from the right side to the left side of the paper, for example, with multi-strand FW device 50a being layer 1, multi-strand FW device 50b being layer 2, and multi-strand FW device 50c being layer 3, … passing through the plurality of multi-strand FW devices, thereby winding all layers of fiber layers 13.

According to such a continuous multi-strand FW device, the multi-strand FW device including the metal wire 13b can be fixed, and the fiber layer 13 including the fiber bundle 13a and the metal wire 13b can be efficiently formed without changing the bobbin during winding. For example, when the layer 1 (the layer in contact with the liner 11) is intended to be a layer including the wire 13b, the multi-strand FW device 50a in fig. 11 may include the wire bobbin 41 as shown in fig. 6A. As shown in fig. 6B, all bobbins of the multi-strand FW devices 50B to 50f are fiber bundle bobbins 40. According to this configuration, since the type of the bobbin does not need to be changed, the fiber bundle 13a and the metal wire 13b can be efficiently wound.

2. Embodiment mode 2

The high-pressure tank and the method for manufacturing the high-pressure tank according to embodiment 2 are different in that a different metal wire (referred to as "metal wire 63 b") is used instead of the metal wire 13b in embodiment 1. Since other configurations and manufacturing methods are described in common with embodiment 1, the metal line 63b will be described here.

The metal wire 13b of embodiment 1 is a metal wire that is energized to inductively heat the carbon fibers of the fiber bundle 13a as described above. In contrast, the metal wire 63b in embodiment 2 is a metal wire for heating the surroundings by self-heat generation by energization. Therefore, the metal line 63b is made of a conductive metal, and the metal line 63b is a metal having high resistance. Specifically, the material is generally used as a heat-generating wire material such as a heater, and is preferably made of a material having a volume resistivity of more than 5.0(μ Ω cm) at 100 ℃.

The sectional shape and the position of the metal wire 63b may be considered to be the same as those of the metal wire 13b described above, but the metal wire 63b itself generates heat to heat the surroundings, and therefore the arrangement does not necessarily have to be a spiral shape (coil shape), and can be changed as appropriate. For example, since the heating by the wire 63b can be performed locally as compared with the induction heating by the wire 13b, when the heating near the joint 16 is to be avoided, it is possible to select an appropriate arrangement such as not disposing a wire in the portion to be avoided. Further, since the metal wires 63b can be arranged to intersect with each other, the amount of heat generation can be easily adjusted.

The high-pressure tank and the method of manufacturing the same according to embodiment 2 also provide the same effects as those of embodiment 1.