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CN-114576547-B - Pressure vessel and method for producing the same

CN114576547BCN 114576547 BCN114576547 BCN 114576547BCN-114576547-B

Abstract

The present disclosure relates to a pressure vessel and a method of manufacturing the same, the pressure vessel including a liner including a cylindrical portion and dome-shaped side portions at both ends of the cylindrical portion, and a carbon fiber layer including a first annular layer surrounding a portion of an outer circumferential surface of the cylindrical portion and a second annular layer surrounding the remaining portion of the outer circumferential surface of the cylindrical portion, each of the second annular layers having a thickness gradually decreasing in a direction from the cylindrical portion to a corresponding one of the side portions.

Inventors

  • LI DONGSHAN

Assignees

  • 现代自动车株式会社
  • 起亚株式会社

Dates

Publication Date
20260512
Application Date
20210805
Priority Date
20201201

Claims (16)

  1. 1. A pressure vessel, comprising: A bushing comprising a cylindrical portion and dome-shaped side portions at both ends of the cylindrical portion, and A carbon fiber layer comprising: A first annular layer surrounding a portion of an outer peripheral surface of the cylindrical portion; A second annular layer surrounding the remaining portion of the outer peripheral surface of the cylindrical portion, each of the second annular layers having a thickness gradually decreasing in a direction from the cylindrical portion to a corresponding one of the side portions, and A second spiral layer surrounding an outer surface of the first annular layer, an outer surface of the second annular layer, and an outer surface of the side portion; wherein the carbon fiber layer comprises a first spiral layer surrounding an outer surface of the liner, and the first annular layer and the second annular layer are formed on the outer surface of the first spiral layer; Wherein the carbon fiber layer includes a third annular layer covering an outer surface of the second spiral layer, the third annular layer being formed longer in length than the first annular layer, and the third annular layer being formed to cover an entire area of the first annular layer and partially cover a partial area of the second annular layer.
  2. 2. The pressure vessel of claim 1, wherein the first annular layer surrounds a central region of the cylindrical portion and the second annular layer surrounds two edge regions of the cylindrical portion, the first annular layer being interposed between the second annular layer.
  3. 3. The pressure vessel of claim 2, wherein the center of the first annular layer corresponds to the center of the cylindrical portion, the length of the first annular layer is 40% to 60% of the length of the cylindrical portion, and the length of each of the second annular layers is 20% to 30% of the length of the cylindrical portion.
  4. 4. A pressure vessel according to claim 3, wherein the thickness of each of the second annular layers decreases linearly in a direction from the cylindrical portion to a respective one of the side portions.
  5. 5. The pressure vessel of claim 4, wherein each of the second annular layers is configured to have a right triangle cross-section, a height H of the right triangle cross-section corresponding to a thickness of the first annular layer, and an angle θ between a hypotenuse and a base of the right triangle cross-section satisfies tan θ = H/L2, where H is the height of the right triangle cross-section and L2 is a length of the respective second annular layer corresponding to the base of the right triangle cross-section.
  6. 6. The pressure vessel of claim 1, wherein the thickness of the first spiral layer is equal to or less than 5% of the total thickness of the carbon fiber layer.
  7. 7. The pressure vessel of claim 1, wherein the third annular layer has a thickness less than the first annular layer.
  8. 8. The pressure vessel of claim 1, wherein the first annular layer has a thickness equal to or greater than 90% of a preset reference annular layer thickness.
  9. 9. The pressure vessel of claim 1, wherein the thickness of the third annular layer is less than 10% of the preset reference annular layer thickness.
  10. 10. A method of manufacturing a pressure vessel, the method comprising: Providing a bushing comprising a cylindrical portion and dome-shaped side portions disposed at both ends of the cylindrical portion; forming a first annular layer surrounding a portion of the outer peripheral surface of the cylindrical portion, and Forming second annular layers which surround the remaining portion of the outer peripheral surface of the cylindrical portion, and each of which has a thickness gradually decreasing in a direction from the cylindrical portion to the corresponding side portion; The method further includes forming a first spiral layer surrounding an outer surface of the liner, wherein the first annular layer and the second annular layer are disposed on the outer surface of the first spiral layer; the method further includes forming a second spiral layer surrounding the outer surface of the first annular layer, the outer surface of the second annular layer, and the outer surface of the side portion; The method further includes forming a third annular layer covering an outer surface of the second spiral layer, the third annular layer being formed longer than the first annular layer in length, and the third annular layer being formed to cover an entire area of the first annular layer and partially cover a partial area of the second annular layer.
  11. 11. The method according to claim 10, wherein: the first annular layer surrounding a central region of the cylindrical portion, and The second annular layer surrounds two edge regions of the cylindrical portion, the first annular layer being interposed between the second annular layer.
  12. 12. The method of claim 11, wherein a center of the first annular layer corresponds to a center of the cylindrical portion, a length of the first annular layer is 40% to 60% of a length of the cylindrical portion, and a length of each of the second annular layers is 20% to 30% of the length of the cylindrical portion.
  13. 13. The method of claim 12, wherein each of the second annular layers has a right triangle section, a height H of the right triangle section corresponding to a thickness of the first annular layer, and an angle θ between a hypotenuse and a base of the right triangle section satisfies tan θ = H/L2, where H is the height of the right triangle section and L2 is a length of the respective second annular layer corresponding to the base of the right triangle section.
  14. 14. The method of claim 10, further comprising forming a second spiral layer surrounding an outer surface of the first annular layer, an outer surface of the second annular layer, and an outer surface of the side portion.
  15. 15. The method of claim 14, further comprising forming a third annular layer covering an outer surface of the second spiral layer.
  16. 16. The method of claim 15, wherein the third annular layer has a thickness less than the first annular layer, the first annular layer has a thickness equal to or greater than 90% of a predetermined reference annular layer thickness, and the third annular layer has a thickness less than 10% of the predetermined reference annular layer thickness.

Description

Pressure vessel and method for producing the same Cross Reference of Related Applications The present application claims the benefit of korean patent application No. 10-2020-0165630, filed on 1 month 12 in 2020, which is incorporated herein by reference. Technical Field The present disclosure relates to a pressure vessel and a method of manufacturing the same. Background The hydrogen vehicle is configured to generate its own electric power by means of a chemical reaction between hydrogen and oxygen and to travel by operation of the electric motor. More specifically, the hydrogen vehicle includes a hydrogen tank (H 2 tank) configured to store hydrogen (H 2), a fuel cell stack configured to generate electric power by means of a redox reaction between hydrogen and oxygen (O 2), various types of devices configured to discharge the generated water, a battery configured to store electric power generated by the fuel cell stack, a controller configured to convert and control the generated electric power, and an electric motor configured to generate driving power. The type 4 pressure vessel may be used as a hydrogen tank for a hydrogen vehicle. The type 4 pressure vessel includes a liner (e.g., a liner of non-metallic material) and a carbon fiber layer formed by wrapping a carbon fiber composite around an outer surface of the liner. At the same time, carbon fiber composites are light in weight and excellent in strength and elasticity but very expensive (e.g., about 20 times or more expensive than common carbon steel of the same weight). Therefore, in order to reduce the manufacturing cost of the pressure vessel, it is necessary to reduce the amount of the carbon fiber composite material used as much as possible. However, if the amount of the carbon fiber composite material used to form the carbon fiber layer of the pressure vessel is reduced by a predetermined amount or more (for example, if the thickness of the carbon fiber layer is reduced), there is a problem in that it is difficult to ensure sufficient structural rigidity of the pressure vessel (particularly structural rigidity against hoop stress applied to the cylindrical portion of the pressure vessel in the circumferential direction) and deterioration in stability and reliability. Accordingly, in recent years, various studies have been made in order to secure structural rigidity and minimize the amount of carbon fiber composite material used, but the results of the studies have remained insufficient. Accordingly, there is a need to develop a technique for ensuring structural rigidity and minimizing the amount of carbon fiber composite material used. Disclosure of Invention The present disclosure relates to a pressure vessel and a method of manufacturing the same. Particular embodiments relate to a pressure vessel that ensures structural rigidity and has improved stability and reliability, and a method of manufacturing the pressure vessel. Embodiments of the present disclosure provide a pressure vessel that ensures structural rigidity and has improved stability and reliability, and a method of manufacturing the pressure vessel. Embodiments of the present disclosure may ensure structural rigidity of the pressure vessel and minimize the amount of carbon fiber composite material used. Embodiments of the present disclosure may improve efficiency of the pressure vessel, reduce weight of the pressure vessel, and reduce manufacturing costs. Embodiments of the present disclosure may simplify the manufacturing process and improve manufacturing efficiency. The objects achieved by the embodiments are not limited to the above objects, and also include objects or effects that can be found in the solutions or embodiments described below. In one embodiment, the present disclosure provides a pressure vessel including a liner including a cylindrical portion and dome-shaped side portions disposed at both ends of the cylindrical portion, and a carbon fiber layer including a first annular layer disposed around a portion of an outer circumferential surface of the cylindrical portion and a second annular layer disposed around the other portion of the outer circumferential surface of the cylindrical portion, and each of which has a thickness gradually decreasing in a direction from the cylindrical portion to the side portions. This is to ensure structural rigidity of the pressure vessel and minimize the amount of carbon fiber composite material used. That is, the carbon fiber composite material is light in weight, excellent in strength and elasticity, but expensive. Therefore, in order to reduce the manufacturing cost of the pressure vessel, it is necessary to reduce the amount of the carbon fiber composite material used as much as possible. However, if the amount of the carbon fiber composite material used to form the carbon fiber layer of the pressure vessel is reduced by a predetermined amount or more (for example, if the thickness of the carbon fiber layer is reduced), there is