JP2022047015A - Tank and manufacturing method of tank - Google Patents

Tank and manufacturing method of tank Download PDF

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Publication number
JP2022047015A
JP2022047015A JP2020152709A JP2020152709A JP2022047015A JP 2022047015 A JP2022047015 A JP 2022047015A JP 2020152709 A JP2020152709 A JP 2020152709A JP 2020152709 A JP2020152709 A JP 2020152709A JP 2022047015 A JP2022047015 A JP 2022047015A
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layer
hoop
tank
helical
reinforcing
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JP7287369B2 (en
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大弥 金井
Masaya Kanai
照宜 古澤
Terunobu Furusawa
相根 李
Sokon Ri
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Toyota Motor Corp
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Toyota Motor Corp
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Priority to CN202110643097.8A priority patent/CN114165723B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/16—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge constructed of plastics materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/02—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge involving reinforcing arrangements
    • F17C1/04—Protecting sheathings
    • F17C1/06—Protecting sheathings built-up from wound-on bands or filamentary material, e.g. wires
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7154—Barrels, drums, tuns, vats
    • B29L2031/7156—Pressure vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0109—Shape cylindrical with exteriorly curved end-piece
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0614—Single wall
    • F17C2203/0621—Single wall with three layers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0636—Metals
    • F17C2203/0646—Aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0636—Metals
    • F17C2203/0648—Alloys or compositions of metals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0658—Synthetics
    • F17C2203/066—Plastics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0658—Synthetics
    • F17C2203/0663—Synthetics in form of fibers or filaments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0658—Synthetics
    • F17C2203/0663—Synthetics in form of fibers or filaments
    • F17C2203/067—Synthetics in form of fibers or filaments helically wound
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0305—Bosses, e.g. boss collars
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/21—Shaping processes
    • F17C2209/2154—Winding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/21—Shaping processes
    • F17C2209/219—Working processes for non metal materials, e.g. extruding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/22—Assembling processes
    • F17C2209/227—Assembling processes by adhesive means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/23—Manufacturing of particular parts or at special locations
    • F17C2209/232—Manufacturing of particular parts or at special locations of walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/23—Manufacturing of particular parts or at special locations
    • F17C2209/234—Manufacturing of particular parts or at special locations of closing end pieces, e.g. caps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/012—Hydrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0165—Applications for fluid transport or storage on the road
    • F17C2270/0184—Fuel cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/32—Hydrogen storage

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Pressure Vessels And Lids Thereof (AREA)

Abstract

To suppress the occurrence of the rollup of a protection layer when cracks are generated at a surface of the protection layer.SOLUTION: A tank comprises: a liner having a cylinder part and dome parts arranged at both ends of the cylinder part; a reinforcing layer arranged on the liner, and formed of CFRP, being a reinforcing layer having a helical layer including carbon fibers, and a first hoop layer contacting with an outer surface of the helical layer, including carbon fibers, and constituting the outermost layer of the reinforcing layer; and a protection layer formed on a portion located on a cylinder part out of the reinforcing layer, and formed of GFRP, being a protection layer having a second hoop layer contacting with the first hoop layer, including glass fibers, and having no helical layer which includes glass fibers.SELECTED DRAWING: Figure 2

Description

本開示は、タンクおよびタンクの製造方法に関する。 The present disclosure relates to tanks and methods of manufacturing tanks.

流体を貯蔵するためのタンクとして、流体を貯蔵する空間を形成するライナと、ライナの上に配置されてＣＦＲＰ（Ｃａｒｂｏｎ Ｆｉｂｅｒ Ｒｅｉｎｆｏｒｃｅｄ Ｐｌａｓｔｉｃｓ：炭素繊維強化樹脂）により形成される補強層と、補強層の上に配置されてＧＦＲＰ（Ｇｌａｓｓ Ｆｉｂｅｒ Ｒｅｉｎｆｏｒｃｅｄ Ｐｌａｓｔｉｃｓ：ガラス繊維強化樹脂）により形成される保護層とを備えたタンクが知られている。特許文献１では、上記保護層として、ヘリカル巻きされたガラス繊維により形成されるヘリカル層と、かかるヘリカル層上に形成され、フープ巻きされたガラス繊維により形成されるフープ層と、を有する層が形成される。 As a tank for storing the fluid, a liner that forms a space for storing the fluid, a reinforcing layer that is placed on the liner and is formed by CFRP (Carbon Fiber Reinforced Plastics), and a reinforcing layer. Tanks are known to be placed on top and provided with a protective layer formed of GFRP (Glass Fiber Reinforced Plastics). In Patent Document 1, as the protective layer, a layer having a helical layer formed of helically wound glass fibers and a hoop layer formed on the helical layer and formed of hoop-wound glass fibers is provided. It is formed.

特開２０１９－２１９０２５号公報Japanese Unexamined Patent Publication No. 2019-21825

経年劣化等に起因してガス充填時に保護層表面に複数の亀裂が生じ、それぞれ内部に向かって伸展した場合、保護層のめくれが生じるおそれがある。例えば、特許文献１の構成を有する保護層を備えるタンクでは、各亀裂の伸展がガラス繊維により形成されるフープ層とヘリカル層の境界において止まり、各亀裂の先端を起点として層間剥離が起こり得る。ＧＦＲＰは、ＣＦＲＰと比較して応力腐食割れが起こり易いので、かかる割れと上述の層間剥離とが相俟って保護層がめくれてしまうことがある。このようなことから、保護層表面に亀裂が発生した場合に、保護層におけるめくれの発生を抑制可能な技術が望まれる。 When a plurality of cracks are generated on the surface of the protective layer during gas filling due to deterioration over time and the like, and each of them extends inward, the protective layer may be turned over. For example, in a tank provided with a protective layer having the configuration of Patent Document 1, the extension of each crack stops at the boundary between the hoop layer and the helical layer formed by the glass fiber, and delamination may occur starting from the tip of each crack. Since GFRP is more susceptible to stress corrosion cracking than CFRP, the protective layer may be turned over due to the combination of such cracking and the above-mentioned delamination. For these reasons, a technique capable of suppressing the occurrence of turning over in the protective layer when a crack occurs on the surface of the protective layer is desired.

本開示は、以下の形態として実現することが可能である。 The present disclosure can be realized in the following forms.

（１）本開示の一形態によれば、タンクが提供される。このタンクは、円筒部と前記円筒部の両端に配置されるドーム部とを有するライナと、前記ライナの上に配置されＣＦＲＰにより形成されている補強層であって、炭素繊維を含んで構成されているヘリカル層と、前記ヘリカル層の外表面に接して炭素繊維を含んで構成されており、前記補強層の最外層を構成する第１フープ層と、を有する補強層と、前記補強層のうちの前記円筒部上に位置する部分の上に配置されＧＦＲＰにより形成されている保護層であって、前記第１フープ層に接してガラス繊維を含んで構成されている第２フープ層を有し、ガラス繊維を含んで構成されているヘリカル層を有しない、保護層と、を備える。
この形態のタンクによれば、保護層は、ガラス繊維のヘリカル巻きにより形成されているヘリカル層を有せず、また、補強層の第１フープ層と第１フープ層に接する保護層の第２フープ層とはいずれもフープ巻きにより形成されているため、保護層表面において生じた亀裂を、第１フープ層と第２フープ層との境界、すなわち、保護層と補強層の境界で止まらせずに、補強層における第１フープ層とヘリカル層との境界まで伸びるように促進できる。これにより、保護層内において各亀裂の先端を起点とした層間剥離が生じることを抑制でき、保護層表面に亀裂が発生した場合に、保護層においてめくれの発生を抑制できる。加えて、ＣＦＲＰは、ＧＦＲＰに比べて応力腐食割れが起こり難いため、各亀裂の伸展が補強層における第１フープ層とヘリカル層の境界まで伸びて、かかる境界において層間剥離が生じた場合でも、補強層においてもめくれの発生を抑制できる。
（２）上記形態のタンクにおいて、前記補強層のうちの前記ドーム部の上に配置されている部分を覆っているプロテクタを、さらに備えてもよい。この形態のタンクによれば、ガラス繊維を含んで構成されているヘリカル層を有しないので、かかるヘリカル層を有する構成に比べてガラス繊維の削減および巻き時間の短縮化が図られる。
（３）上記形態のタンクにおいて、前記補強層は、前記ヘリカル層よりも内側に位置して炭素繊維を含んで構成されている第３フープ層を、さらに有してもよい。この形態のタンクによれば、周方向応力の高い内側に第３フープ層を有することによって、タンク強度を向上できる。
本開示は、タンク以外の種々の形態で実現することも可能である。例えば、タンクを搭載した車両やタンクの製造方法等の形態で実現することができる。 (1) According to one embodiment of the present disclosure, a tank is provided. This tank is a reinforcing layer having a liner having a cylindrical portion and dome portions arranged at both ends of the cylindrical portion, and a reinforcing layer arranged on the liner and formed by CFRP, and is composed of carbon fibers. A reinforcing layer having a helical layer and a first hoop layer which is in contact with the outer surface of the helical layer and contains carbon fibers and constitutes the outermost layer of the reinforcing layer, and the reinforcing layer of the reinforcing layer. It is a protective layer formed by GFRP placed on a portion of the cylinder located on the cylindrical portion, and has a second hoop layer formed in contact with the first hoop layer and containing glass fiber. However, it is provided with a protective layer which does not have a helical layer composed of glass fibers.
According to this form of tank, the protective layer does not have a helical layer formed by helical winding of glass fiber, and the first hoop layer of the reinforcing layer and the second protective layer in contact with the first hoop layer. Since the hoop layer is formed by hoop winding, the cracks generated on the surface of the protective layer do not stop at the boundary between the first hoop layer and the second hoop layer, that is, the boundary between the protective layer and the reinforcing layer. In addition, it can be promoted to extend to the boundary between the first hoop layer and the helical layer in the reinforcing layer. As a result, it is possible to suppress the occurrence of delamination starting from the tip of each crack in the protective layer, and it is possible to suppress the occurrence of turning over in the protective layer when cracks occur on the surface of the protective layer. In addition, since CFRP is less prone to stress corrosion cracking than GFRP, even if the elongation of each crack extends to the boundary between the first hoop layer and the helical layer in the reinforcing layer, and delamination occurs at such a boundary. The occurrence of turning can be suppressed even in the reinforcing layer.
(2) In the tank of the above-described form, a protector that covers a portion of the reinforcing layer arranged on the dome portion may be further provided. Since the tank of this form does not have a helical layer composed of glass fibers, the glass fibers can be reduced and the winding time can be shortened as compared with the configuration having such a helical layer.
(3) In the tank of the above-described embodiment, the reinforcing layer may further have a third hoop layer located inside the helical layer and composed of carbon fibers. According to this type of tank, the tank strength can be improved by having the third hoop layer inside with high circumferential stress.
The present disclosure can also be realized in various forms other than the tank. For example, it can be realized in the form of a vehicle equipped with a tank, a manufacturing method of the tank, or the like.

本開示の実施形態としてのタンクの断面模式図である。It is sectional drawing of the tank as the embodiment of this disclosure. 円筒部上に配置される補強層および保護層の断面の拡大図である。It is an enlarged view of the cross section of the reinforcing layer and the protective layer arranged on a cylindrical part. タンクの製造方法を示す工程図である。It is a process drawing which shows the manufacturing method of a tank.

Ａ．実施形態：
Ａ１．タンクの全体構成：
図１は、本開示の実施形態としてのタンク１００の断面模式図である。タンク１００は、流体を貯蔵するタンクである。本実施形態では、タンク１００は、流体として圧縮水素を貯蔵し、例えば、水素タンク搭載装置である燃料電池車両に搭載される。なお、図１および図２は本開示に係るタンク１００の各部の様子を模式的に示しているため、図に示された各部のサイズは、具体的なサイズを表わすものではない。 A. Embodiment:
A1. Overall composition of the tank:
FIG. 1 is a schematic cross-sectional view of a tank 100 as an embodiment of the present disclosure. The tank 100 is a tank for storing the fluid. In the present embodiment, the tank 100 stores compressed hydrogen as a fluid and is mounted on, for example, a fuel cell vehicle which is a hydrogen tank mounting device. Since FIGS. 1 and 2 schematically show the state of each part of the tank 100 according to the present disclosure, the size of each part shown in the figure does not represent a specific size.

タンク１００は、その構成部分として、タンク円筒部１０２と、一対のタンクドーム部１０４と、を有する。タンク円筒部１０２は、略円筒状の形状を有する。タンクドーム部１０４は、タンク円筒部１０２の半径と同じ半径を有する略半球状の形状を有する。タンクドーム部１０４は、タンク円筒部１０２の両端に、それらの円形の開口がタンク円筒部１０２側を向くように、配されている。図１においては、タンク円筒部１０２とタンクドーム部１０４との境界を、破線で示す。 The tank 100 has a tank cylindrical portion 102 and a pair of tank dome portions 104 as constituent portions thereof. The tank cylindrical portion 102 has a substantially cylindrical shape. The tank dome portion 104 has a substantially hemispherical shape having the same radius as the radius of the tank cylindrical portion 102. The tank dome portion 104 is arranged at both ends of the tank cylindrical portion 102 so that their circular openings face the tank cylindrical portion 102 side. In FIG. 1, the boundary between the tank cylindrical portion 102 and the tank dome portion 104 is shown by a broken line.

タンク１００は、ライナ１０と、補強層２０と、保護層２５と、口金３０と、口金４０と、一対のプロテクタ５０と、を備える。 The tank 100 includes a liner 10, a reinforcing layer 20, a protective layer 25, a base 30, a base 40, and a pair of protectors 50.

ライナ１０は、タンク１００において、最も内側の層を構成する。ライナ１０は、円筒部１２と、ドーム部１４とを有する。円筒部１２は、タンク円筒部１０２の一部である。ドーム部１４は、タンクドーム部１０４の一部であり、円筒部１２の両端に配置される。ライナ１０は、例えば、ナイロン系樹脂（ポリアミド系樹脂）やポリエチレン系樹脂等の合成樹脂、あるいは、アルミニウム合金等の金属によって形成することができ、本実施形態ではナイロンによって形成している。ライナ１０は、ライナ１０の内部空間に充填された水素等が外部に漏れないように遮断する性質（いわゆるガスバリア性）を有する。 The liner 10 constitutes the innermost layer in the tank 100. The liner 10 has a cylindrical portion 12 and a dome portion 14. The cylindrical portion 12 is a part of the tank cylindrical portion 102. The dome portion 14 is a part of the tank dome portion 104 and is arranged at both ends of the cylindrical portion 12. The liner 10 can be formed of, for example, a synthetic resin such as a nylon resin (polyamide resin) or a polyethylene resin, or a metal such as an aluminum alloy, and is formed of nylon in this embodiment. The liner 10 has a property (so-called gas barrier property) of blocking hydrogen or the like filled in the internal space of the liner 10 from leaking to the outside.

口金３０は、ライナ１０のうち、一対のドーム部１４のうちの一方に対応する部分の頂部に配されている。ドーム部１４の「頂部」とは、ドーム部１４と、タンク１００の中心軸ＣＡとの交点である。口金３０は、貫通孔を有する。口金３０の貫通孔は、タンク１００の内部と外部とを接続している。口金３０を介して、タンク１００に、配管やバルブが取りつけられる。 The base 30 is arranged at the top of the portion of the liner 10 corresponding to one of the pair of dome portions 14. The "top" of the dome portion 14 is an intersection of the dome portion 14 and the central axis CA of the tank 100. The base 30 has a through hole. The through hole of the base 30 connects the inside and the outside of the tank 100. Piping and valves are attached to the tank 100 via the base 30.

口金４０は、ライナ１０のうち、一対のドーム部１４のうちの他方に対応する部分の頂部に配されている。口金３０，４０は、補強層２０および保護層２５を形成する際に、ライナ１０をフィラメントワインディング装置へ取り付けるための取付部としても機能する。口金３０、４０は、例えば、インサート成形によってライナ１０に接合される。 The base 40 is arranged at the top of the liner 10 corresponding to the other of the pair of dome portions 14. The bases 30 and 40 also function as attachment portions for attaching the liner 10 to the filament winding device when forming the reinforcing layer 20 and the protective layer 25. The bases 30 and 40 are joined to the liner 10 by, for example, insert molding.

プロテクタ５０は、後述する補強層２０のうちのドーム部１４の上に配置されている部分を覆っている。かかる部分は、湿気硬化型接着剤により接着されている。プロテクタ５０は、例えばウレタン材で、最厚部の厚みは３０ｍｍ程度、平均外径φは３００ｍｍ程度である。 The protector 50 covers a portion of the reinforcing layer 20 described later, which is arranged on the dome portion 14. Such a portion is adhered by a moisture-curable adhesive. The protector 50 is, for example, a urethane material, the thickness of the thickest portion is about 30 mm, and the average outer diameter φ is about 300 mm.

補強層２０は、ライナ１０の外表面全体と、口金３０の一部および口金４０の一部を覆うように形成されている。補強層２０は、タンク１００の耐圧性を強化する機能を奏する。補強層２０は、エポキシ樹脂と炭素繊維との複合材料であるＣＦＲＰ（Ｃａｒｂｏｎ Ｆｉｂｅｒ Ｒｅｉｎｆｏｒｃｅｄ Ｐｌａｓｔｉｃｓ：炭素繊維強化樹脂）で構成されている。ＣＦＲＰは、後述するＧＦＲＰに比べて応力腐食割れが生じ難い。 The reinforcing layer 20 is formed so as to cover the entire outer surface of the liner 10, a part of the base 30, and a part of the base 40. The reinforcing layer 20 has a function of strengthening the pressure resistance of the tank 100. The reinforcing layer 20 is made of CFRP (Carbon Fiber Reinforced Plastics: carbon fiber reinforced resin), which is a composite material of an epoxy resin and carbon fiber. CFRP is less likely to cause stress corrosion cracking than GFRP, which will be described later.

補強層２０のうちの円筒部１２上に位置する部分は、かかる部分の外表面に接する保護層により覆われている。他方、補強層２０のうちのドーム部１４の上に配置されている部分は、かかる部分の外表面に接するプロテクタ５０により覆われている。 The portion of the reinforcing layer 20 located on the cylindrical portion 12 is covered with a protective layer in contact with the outer surface of the portion. On the other hand, the portion of the reinforcing layer 20 arranged on the dome portion 14 is covered with the protector 50 in contact with the outer surface of the portion.

補強層２０における炭素繊維の直径は、後に説明する保護層２５のガラス繊維の直径よりも小さい。このような構成とすることにより、補強層２０において、保護層２５のガラス繊維よりも密に炭素繊維を配することができる。このため、補強層２０における繊維の直径が保護層２５の直径以上である態様に比べて、よりタンク１００の耐圧性を強化することができる。 The diameter of the carbon fiber in the reinforcing layer 20 is smaller than the diameter of the glass fiber of the protective layer 25 described later. With such a configuration, the carbon fibers can be arranged more densely in the reinforcing layer 20 than in the glass fibers of the protective layer 25. Therefore, the pressure resistance of the tank 100 can be further enhanced as compared with the embodiment in which the diameter of the fiber in the reinforcing layer 20 is equal to or larger than the diameter of the protective layer 25.

保護層２５は、補強層２０のうちの円筒部１２上に位置する部分の上に配置されている。具体的には、保護層２５は、かかる部分のうちの最外層に接している。保護層２５は、熱硬化性樹脂とガラス繊維との複合材料であるＧＦＲＰ（Ｇｌａｓｓ Ｆｉｂｅｒ Ｒｅｉｎｆｏｒｃｅｄ Ｐｌａｓｔｉｃｓ：ガラス繊維強化樹脂）で構成されている。その結果、保護層２５は、補強層２０よりも高い耐衝撃性を備える。 The protective layer 25 is arranged on a portion of the reinforcing layer 20 located on the cylindrical portion 12. Specifically, the protective layer 25 is in contact with the outermost layer of such a portion. The protective layer 25 is made of GFRP (Glass Fiber Reinforced Plastics: glass fiber reinforced plastic), which is a composite material of a thermosetting resin and glass fiber. As a result, the protective layer 25 has higher impact resistance than the reinforcing layer 20.

図２は、円筒部１２上に配置される補強層２０および保護層２５の断面の拡大図である。図１および図２において、タンク１００の中心軸ＣＡから外側に向かう向きを矢印Ｄｏで示す。図２は、技術内容を説明するための説明図であり、各部の寸法を正確に表すものではない。 FIG. 2 is an enlarged view of a cross section of the reinforcing layer 20 and the protective layer 25 arranged on the cylindrical portion 12. In FIGS. 1 and 2, the direction toward the outside from the central axis CA of the tank 100 is indicated by an arrow Do. FIG. 2 is an explanatory diagram for explaining the technical contents, and does not accurately represent the dimensions of each part.

補強層２０は、ヘリカル層２５２と、第１フープ層２５４とを有する。ヘリカル層２５２と、第１フープ層２５４とは、それぞれＣＦＲＰで構成されている。ヘリカル層２５２と、第１フープ層２５４とがそれぞれ含む熱硬化性樹脂は、同一のエポキシ樹脂である。 The reinforcing layer 20 has a helical layer 252 and a first hoop layer 254. The helical layer 252 and the first hoop layer 254 are each made of CFRP. The thermosetting resin contained in the helical layer 252 and the first hoop layer 254 is the same epoxy resin.

ヘリカル層２５２は、ライナ１０の上に形成されている。本実施形態では、ヘリカル層２５２は、ライナ１０に接して配置され、ライナ１０を囲むように形成されている。ヘリカル層２５２は、ヘリカル巻きされている炭素繊維Ｃ１と、炭素繊維Ｃ１を固定しているエポキシ樹脂Ｒｅ１とを含む。「ヘリカル巻き」とは、タンク１００の中心軸ＣＡに対して垂直な平面と交わる向きで、繊維が巻き付けられる、繊維の巻き付け方法である。 The helical layer 252 is formed on the liner 10. In the present embodiment, the helical layer 252 is arranged in contact with the liner 10 and is formed so as to surround the liner 10. The helical layer 252 contains a carbon fiber C1 that is helically wound and an epoxy resin Re1 that fixes the carbon fiber C1. The "helical winding" is a method of winding fibers in which the fibers are wound in a direction intersecting a plane perpendicular to the central axis CA of the tank 100.

第１フープ層２５４は、補強層２０のうちの円筒部１２上に位置する部分に設けられている。第１フープ層２５４は、ヘリカル層２５２の外表面に接して位置する。第１フープ層２５４は、補強層２０の最外層を構成する。第１フープ層２５４は、フープ巻きされている炭素繊維Ｃ２と、炭素繊維Ｃ２を固定しているエポキシ樹脂Ｒｅ２とを含む。「フープ巻き」とは、タンク本体の中心軸ＣＡに対して垂直な平面と略平行な向きで、繊維が巻き付けられる、繊維の巻き付け方法である。 The first hoop layer 254 is provided in a portion of the reinforcing layer 20 located on the cylindrical portion 12. The first hoop layer 254 is located in contact with the outer surface of the helical layer 252. The first hoop layer 254 constitutes the outermost layer of the reinforcing layer 20. The first hoop layer 254 contains the carbon fiber C2 wound around the hoop and the epoxy resin Re2 fixing the carbon fiber C2. "Hoop winding" is a method of winding fibers in which fibers are wound in a direction substantially parallel to a plane perpendicular to the central axis CA of the tank body.

保護層２５は、第２フープ層２５６と、樹脂層２５８とを有する。第２フープ層２５６は、ＧＦＲＰで構成されている。第２フープ層２５６が含む熱硬化性樹脂はエポキシ樹脂である。 The protective layer 25 has a second hoop layer 256 and a resin layer 258. The second hoop layer 256 is composed of GFRP. The thermosetting resin contained in the second hoop layer 256 is an epoxy resin.

第２フープ層２５６は、保護層２５のうちの円筒部１２上に位置する部分に配置されている。第２フープ層２５６は、第１フープ層２５４の外側であり、かつ、第１フープ層２５４に接して位置する。第２フープ層２５６は、フープ巻きされているガラス繊維Ｇ３と、ガラス繊維Ｇ３を固定しているエポキシ樹脂Ｒｅ３とを含む。樹脂層２５８は、第２フープ層２５６の外側に接して位置する。樹脂層２５８は、繊維がない層であり、例えば、内側の第２フープ層２５６におけるエポキシ樹脂Ｒｅ３が、樹脂層２５８へと移動したことにより形成された層である。 The second hoop layer 256 is arranged in a portion of the protective layer 25 located on the cylindrical portion 12. The second hoop layer 256 is located outside the first hoop layer 254 and in contact with the first hoop layer 254. The second hoop layer 256 includes a glass fiber G3 wound around the hoop and an epoxy resin Re3 fixing the glass fiber G3. The resin layer 258 is located in contact with the outside of the second hoop layer 256. The resin layer 258 is a fiber-free layer, for example, a layer formed by the movement of the epoxy resin Re3 in the inner second hoop layer 256 to the resin layer 258.

ガスの充填および放出が繰り返されると、図２に示すような亀裂ＣＲが生じ得る。亀裂ＣＲは、保護層２５の外表面を起点として発生し、内部へ伸展した亀裂であり、いわゆる「トランスバースクラック」とも呼ばれる。この内部への伸展は、保護層２５と補強層２０との境界では止まらない。これは、保護層２５の最内層と、補強層２０の最外層とは、共に、繊維の巻き付け方法が同じフープ巻きであり、繊維の巻き付け角度が互いにほぼ等しいからである。この結果、亀裂ＣＲの先端を起点として起こり得る層間剥離が抑制され、保護層２５におけるめくれが抑制される。 Repeated filling and discharging of gas can result in crack CR as shown in FIG. The crack CR is a crack that originates from the outer surface of the protective layer 25 and extends inward, and is also called a so-called “transverse crack”. This inward extension does not stop at the boundary between the protective layer 25 and the reinforcing layer 20. This is because the innermost layer of the protective layer 25 and the outermost layer of the reinforcing layer 20 are both hoop-wound with the same fiber winding method, and the fiber winding angles are substantially equal to each other. As a result, delamination that may occur starting from the tip of the crack CR is suppressed, and turning over in the protective layer 25 is suppressed.

亀裂ＣＲは、保護層２５と補強層２０の境界を突破して、第１フープ層２５４の内部まで伸展する。かかる第１フープ層２５４の内部における伸展は、補強層２０のうちの第１フープ層２５４と、ヘリカル層２５２との境界で止まる。これは、第１フープ層２５４と、ヘリカル層２５２とでは、異なる繊維の巻き付け方法で繊維の巻き付け角度が異なるからである。この結果、亀裂ＣＲの先端は第１フープ層２５４と、ヘリカル層２５２との境界に位置し、これにより、亀裂ＣＲの先端を起点として層間剥離が生じ得る。しかしながら、かかる層間剥離が生じた場合であっても、ＣＦＲＰは、ＧＦＲＰに比べて応力腐食割れが起こり難いため、層間剥離と応力腐食割れとが相俟って生じるめくれは、補強層２０において生じることが抑制される。 The crack CR breaks through the boundary between the protective layer 25 and the reinforcing layer 20 and extends to the inside of the first hoop layer 254. The extension inside the first hoop layer 254 stops at the boundary between the first hoop layer 254 of the reinforcing layer 20 and the helical layer 252. This is because the first hoop layer 254 and the helical layer 252 have different fiber winding angles depending on the fiber winding method. As a result, the tip of the crack CR is located at the boundary between the first hoop layer 254 and the helical layer 252, which may cause delamination starting from the tip of the crack CR. However, even when such delamination occurs, CFRP is less likely to cause stress corrosion cracking than GFRP, so that delamination and stress corrosion cracking are combined to cause turning up in the reinforcing layer 20. Is suppressed.

Ａ２．タンクの製造方法：
図３は、タンク１００の製造方法を示す工程図である。まず、口金３０および口金４０が取り付けられた状態のライナ１０が準備される（工程Ｐ１０）。 A2. How to make a tank:
FIG. 3 is a process diagram showing a manufacturing method of the tank 100. First, the liner 10 with the base 30 and the base 40 attached is prepared (step P10).

ライナ１０の上に、ＣＦＲＰにより補強層２０が形成される（工程Ｐ２０）。かかる補強層形成工程Ｐ２０は、工程Ｐ２２と、工程Ｐ２４とを含む。 A reinforcing layer 20 is formed on the liner 10 by CFRP (step P20). The reinforcing layer forming step P20 includes a step P22 and a step P24.

工程Ｐ２２では、ライナ１０の上に、炭素繊維をヘリカル巻きすることによりヘリカル層２５２が形成される。より具体的には、エポキシ樹脂Ｒｅ１が含浸された炭素繊維Ｃ１が、フィラメントワインディング装置によって、ヘリカル巻きで、ライナ１０の上に巻き付けられる。その際、炭素繊維Ｃ１は、円筒部１２とドーム部１４の上に、巻き付けられる（図１参照）。その結果、円筒部１２とドーム部１４に、ヘリカル層２５２が形成される。なお、工程Ｐ２２の段階では、ヘリカル層２５２に含まれるエポキシ樹脂Ｒｅ１は硬化されていない。 In step P22, the helical layer 252 is formed by helically winding carbon fibers on the liner 10. More specifically, the carbon fiber C1 impregnated with the epoxy resin Re1 is wound on the liner 10 by a filament winding device in a helical winding. At that time, the carbon fiber C1 is wound around the cylindrical portion 12 and the dome portion 14 (see FIG. 1). As a result, the helical layer 252 is formed on the cylindrical portion 12 and the dome portion 14. At the stage of step P22, the epoxy resin Re1 contained in the helical layer 252 has not been cured.

工程Ｐ２４では、円筒部１２上に位置するヘリカル層２５２の外表面に接して炭素繊維をフープ巻きすることにより、補強層２０の最外層となる第１フープ層２５４が形成される。より具体的には、エポキシ樹脂Ｒｅ２を含浸させた炭素繊維Ｃ２が、フィラメントワインディング装置によって、フープ巻きで、ヘリカル層２５２の上に巻き付けられる。その結果、円筒部１２に、第１フープ層２５４ が形成される。なお、工程Ｐ２４の段階では、第１フープ層２５４に含まれるエポキシ樹脂Ｒｅ２は硬化されていない。 In step P24, the carbon fiber is hoop-wound in contact with the outer surface of the helical layer 252 located on the cylindrical portion 12, so that the first hoop layer 254, which is the outermost layer of the reinforcing layer 20, is formed. More specifically, the carbon fiber C2 impregnated with the epoxy resin Re2 is wound on the helical layer 252 by a filament winding device by hoop winding. As a result, the first hoop layer 254 is formed on the cylindrical portion 12. At the stage of step P24, the epoxy resin Re2 contained in the first hoop layer 254 has not been cured.

補強層２０のうちの円筒部１２上に位置する部分の上に保護層２５を形成する（工程Ｐ３０）。かかる保護層形成工程Ｐ３０では、第１フープ層２５４に接してガラス繊維をフープ巻きすることにより、第２フープ層２５６を形成する。より具体的には、エポキシ樹脂Ｒｅ３が含浸されたガラス繊維が、フィラメントワインディング装置によって、第１フープ層２５４の上に巻き付けられることにより、保護層２５が形成される。なお、工程Ｐ３０の段階では、保護層２５に含まれるエポキシ樹脂Ｒｅ３は硬化されていない。 The protective layer 25 is formed on the portion of the reinforcing layer 20 located on the cylindrical portion 12 (step P30). In the protective layer forming step P30, the second hoop layer 256 is formed by hoop-wrapping the glass fiber in contact with the first hoop layer 254. More specifically, the protective layer 25 is formed by winding the glass fiber impregnated with the epoxy resin Re3 on the first hoop layer 254 by the filament winding device. At the stage of step P30, the epoxy resin Re3 contained in the protective layer 25 is not cured.

補強層２０および保護層２５に含まれているエポキシ樹脂を加熱して、補強層２０および保護層２５に含まれているエポキシ樹脂を硬化させる（工程Ｐ４０）。樹脂の硬化は、例えば、加熱炉を用いた加熱や、高周波誘導加熱を誘起する誘導加熱コイルを用いた誘導加熱手法により行なうことができる。補強層２０のうちのドーム部１４の上に配置されている部分にプロテクタ５０が組み付けられて（工程Ｐ５０）、タンク１００が完成する。 The epoxy resin contained in the reinforcing layer 20 and the protective layer 25 is heated to cure the epoxy resin contained in the reinforcing layer 20 and the protective layer 25 (step P40). Curing of the resin can be performed, for example, by heating using a heating furnace or an induction heating method using an induction heating coil that induces high-frequency induction heating. The protector 50 is assembled to the portion of the reinforcing layer 20 arranged on the dome portion 14 (process P50), and the tank 100 is completed.

以上説明した本実施形態のタンク１００によれば、補強層２０の第１フープ層２５４と第１フープ層２５４に接する保護層２５の第２フープ層２５６とはいずれもフープ巻きにより形成されている。このため、保護層２５の表面において生じた亀裂ＣＲを、第１フープ層２５４と、第２フープ層２５６との境界、すなわち、補強層２０のうちの最外層と、保護層２５のうちの最内層との境界で止まらせずに、補強層２０における第１フープ層２５４と、ヘリカル層２５２との境界まで伸びるように促進できる。これにより、保護層２５において亀裂ＣＲの先端を起点とした層間剥離が生じることを抑制でき、保護層２５の表面に亀裂が発生した場合に、保護層２５においてめくれが発生することを抑制できる。加えて、ＣＦＲＰは、ＧＦＲＰに比べて応力腐食割れが起こり難いため、亀裂ＣＲの伸展が補強層２０における第１フープ層２５４とヘリカル層２５２の境界まで伸びて、かかる境界において層間剥離が生じた場合でも、補強層２０においてめくれが発生することを抑制できる。このようなことから、保護層２５の表面に亀裂が生じた場合に、保護層２５および補強層２０においてめくれが発生することを抑制できる。 According to the tank 100 of the present embodiment described above, both the first hoop layer 254 of the reinforcing layer 20 and the second hoop layer 256 of the protective layer 25 in contact with the first hoop layer 254 are formed by hoop winding. .. Therefore, the crack CR generated on the surface of the protective layer 25 is formed at the boundary between the first hoop layer 254 and the second hoop layer 256, that is, the outermost layer of the reinforcing layer 20 and the outermost layer of the protective layer 25. It can be promoted to extend to the boundary between the first hoop layer 254 and the helical layer 252 in the reinforcing layer 20 without stopping at the boundary with the inner layer. As a result, it is possible to suppress the occurrence of delamination starting from the tip of the crack CR in the protective layer 25, and it is possible to suppress the occurrence of turning over in the protective layer 25 when a crack occurs on the surface of the protective layer 25. In addition, since CFRP is less likely to cause stress corrosion cracking than GFRP, the extension of crack CR extends to the boundary between the first hoop layer 254 and the helical layer 252 in the reinforcing layer 20, and delamination occurs at such a boundary. Even in this case, it is possible to suppress the occurrence of turning over in the reinforcing layer 20. Therefore, when a crack is generated on the surface of the protective layer 25, it is possible to prevent the protective layer 25 and the reinforcing layer 20 from being turned over.

また、本実施形態のタンク１００は、補強層２０のうちのドーム部１４の上に配置されている部分を覆っているプロテクタ５０を備え、ガラス繊維を含んで構成されているヘリカル層を有しない。このため、かかるヘリカル層を有する構成に比べてガラス繊維の削減および巻き時間の短縮化を図ることができる。 Further, the tank 100 of the present embodiment includes a protector 50 covering a portion of the reinforcing layer 20 arranged on the dome portion 14, and does not have a helical layer composed of glass fibers. .. Therefore, it is possible to reduce the number of glass fibers and shorten the winding time as compared with the configuration having such a helical layer.

Ｂ．他の実施形態：
（Ｂ１）上記実施形態のタンク１００において、補強層２０のうちの最内層はヘリカル層２５２であったが、本開示はこれに限られない。補強層２０は、ヘリカル層２５２よりも内側に位置して炭素繊維を含んで構成されている第３フープ層を、さらに有してもよい。タンク１００にガスを充填して内圧を付与したときに、タンク１００に入力される最も高い応力は周方向応力であり、繊維強度は繊維方向にしか発現しないため、周方向応力に対してはフープ層が主に機能している。このため、ヘリカル層２５２よりも内側であって、周方向応力のより高い位置に第３フープ層を形成することによって、タンク強度を向上できる。なお、かかる構成では、フープ層とヘリカル層とを交互に形成することを所定回数繰り返し実行してもよい。 B. Other embodiments:
(B1) In the tank 100 of the above embodiment, the innermost layer of the reinforcing layer 20 is the helical layer 252, but the present disclosure is not limited to this. The reinforcing layer 20 may further have a third hoop layer located inside the helical layer 252 and composed of carbon fibers. When the tank 100 is filled with gas and an internal pressure is applied, the highest stress input to the tank 100 is the circumferential stress, and the fiber strength is expressed only in the fiber direction. Therefore, the hoop is applied to the circumferential stress. The layer is mainly functioning. Therefore, the tank strength can be improved by forming the third hoop layer at a position inside the helical layer 252 and having a higher circumferential stress. In such a configuration, the hoop layer and the helical layer may be alternately formed a predetermined number of times.

（Ｂ２）上記実施形態のタンク１００では、補強層２０のうちのドーム部１４の上に配置されている部分はプロテクタ５０によって覆われていたが、プロテクタ５０によって覆われていなくてもよい。また、かかる部分は、プロテクタ５０に替えて、保護層２５としてガラス繊維のヘリカル巻きにより形成されたヘリカル層を有してもよい。 (B2) In the tank 100 of the above embodiment, the portion of the reinforcing layer 20 arranged on the dome portion 14 is covered by the protector 50, but may not be covered by the protector 50. Further, such a portion may have a helical layer formed by helical winding of glass fiber as a protective layer 25 instead of the protector 50.

本開示は、上述の実施形態に限られるものではなく、その趣旨を逸脱しない範囲において種々の構成で実現することができる。例えば、発明の概要の欄に記載した各形態中の技術的特徴に対応する実施形態の技術的特徴は、上述の課題の一部又は全部を解決するために、あるいは、上述の効果の一部又は全部を達成するために、適宜、差し替えや、組み合わせを行うことが可能である。また、その技術的特徴が本明細書中に必須なものとして説明されていなければ、適宜、削除することが可能である。 The present disclosure is not limited to the above-described embodiment, and can be realized by various configurations within a range not deviating from the gist thereof. For example, the technical features of the embodiments corresponding to the technical features in each of the embodiments described in the summary of the invention are for solving some or all of the above-mentioned problems, or part of the above-mentioned effects. Or, in order to achieve all of them, it is possible to replace or combine them as appropriate. Further, if the technical feature is not described as essential in the present specification, it can be appropriately deleted.

１０…ライナ、１２…円筒部、１４…ドーム部、２０…補強層、２５…保護層、３０,４０…口金、５０…プロテクタ、１００…タンク、１０２…タンク円筒部、１０４…タンクドーム部、２５２…ヘリカル層、２５４…第１フープ層、２５６…第２フープ層、２５８…樹脂層、Ｃ１,Ｃ２…炭素繊維、ＣＡ…中心軸、ＣＲ…亀裂、Ｄｏ…矢印、Ｇ３…ガラス繊維、Ｐ１０,Ｐ２０,Ｐ２２,Ｐ２４,Ｐ３０,Ｐ４０,Ｐ５０…工程、Ｒｅ１,Ｒｅ２,Ｒｅ３…エポキシ樹脂 10 ... Liner, 12 ... Cylindrical part, 14 ... Dome part, 20 ... Reinforcing layer, 25 ... Protective layer, 30, 40 ... Base, 50 ... Protector, 100 ... Tank, 102 ... Tank cylindrical part, 104 ... Tank dome part, 252 ... Helical layer, 254 ... First hoop layer, 256 ... Second hoop layer, 258 ... Resin layer, C1, C2 ... Carbon fiber, CA ... Central axis, CR ... Crack, Do ... Arrow, G3 ... Glass fiber, P10 , P20, P22, P24, P30, P40, P50 ... Process, Re1, Re2, Re3 ... Epoxy resin

Claims (4)

タンクであって、
円筒部と前記円筒部の両端に配置されるドーム部とを有するライナと、
前記ライナの上に配置されＣＦＲＰにより形成されている補強層であって、
炭素繊維を含んで構成されているヘリカル層と、
前記ヘリカル層の外表面に接して炭素繊維を含んで構成されており、前記補強層の最外層を構成する第１フープ層と、
を有する補強層と、
前記補強層のうちの前記円筒部上に位置する部分の上に配置されＧＦＲＰにより形成されている保護層であって、前記第１フープ層に接してガラス繊維を含んで構成されている第２フープ層を有し、ガラス繊維を含んで構成されているヘリカル層を有しない、保護層と、
を備える、タンク。 It ’s a tank,
A liner having a cylindrical portion and dome portions arranged at both ends of the cylindrical portion,
A reinforcing layer placed on the liner and formed of CFRP.
A helical layer composed of carbon fibers and
The first hoop layer, which is in contact with the outer surface of the helical layer and contains carbon fibers and constitutes the outermost layer of the reinforcing layer,
With a reinforcing layer,
A second protective layer formed by GFRP, which is arranged on a portion of the reinforcing layer located on the cylindrical portion, and which is in contact with the first hoop layer and includes glass fibers. A protective layer having a hoop layer and no helical layer composed of glass fibers.
Equipped with a tank. 請求項１に記載のタンクであって、
前記補強層のうちの前記ドーム部の上に配置されている部分を覆っているプロテクタを、さらに備える、タンク。 The tank according to claim 1.
A tank further comprising a protector covering a portion of the reinforcing layer disposed above the dome portion. 請求項１または請求項２に記載のタンクであって、
前記補強層は、前記ヘリカル層よりも内側に位置して炭素繊維を含んで構成されている第３フープ層を、さらに有する、タンク。 The tank according to claim 1 or 2.
The reinforcing layer further has a third hoop layer located inside the helical layer and composed of carbon fibers. 請求項１から請求項３までのいずれか一項に記載のタンクの製造方法であって、
前記補強層を形成する補強層形成工程であって、
炭素繊維をヘリカル巻きすることによりヘリカル層を形成する工程と、
炭素繊維をフープ巻きすることにより前記補強層の最外層を構成する前記第１フープ層を形成する工程と、
を有する補強層形成工程と、
前記保護層を形成する保護層形成工程であって、前記第１フープ層に接してガラス繊維をフープ巻きすることにより、第２フープ層を形成する保護層形成工程と、
を備える、タンクの製造方法。 The method for manufacturing a tank according to any one of claims 1 to 3.
In the reinforcing layer forming step of forming the reinforcing layer,
The process of forming a helical layer by helically winding carbon fibers,
A step of forming the first hoop layer constituting the outermost layer of the reinforcing layer by winding carbon fibers in a hoop, and a step of forming the first hoop layer.
Reinforcing layer forming process and
In the protective layer forming step of forming the protective layer, the protective layer forming step of forming the second hoop layer by hoop-wrapping the glass fiber in contact with the first hoop layer.
A method of manufacturing a tank.
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