Pressure vessel and pressure-vessel manufacturing method

Patent metadata

Field	Value
Publication number	US-11549643-B2
Application number	US-201917262815-A
Country	US
Kind code	B2
Filing date	Jul 17, 2019
Priority date	Jul 31, 2018
Publication date	Jan 10, 2023
Grant date	Jan 10, 2023

Abstract

A pressure vessel includes a liner including a cylindrical body and a dorm portion continuous with at least one end of the body in an axial direction and includes a reinforced fiber sheet covering an outer side of the liner and made of fabric. The reinforced fiber sheet includes first yarns arranged on the body and the dorm portion such that yarn main axes of the first yarns extend in the circumferential direction of the liner and second yarns arranged on the body and the dorm portion such that yarn main axes of the second yarns extend in the axial direction of the liner. A total number of the first yarns or the second yarns that exist per unit length in the axial direction of the liner is smaller in the dorm portion than in the body.

First claim

The invention claimed is:

1. A pressure vessel, comprising:
a liner including a cylindrical body and curved shaped dome portions continuous at each end of the body in an axial direction; and
a reinforced fiber sheet wound onto an outer circumferential surface of the liner in a circumferential direction of the liner and covering an outer side of the liner, the reinforced fiber sheet being made of fabric, wherein
the reinforced fiber sheet includes first yarns arranged on the body and the curved shaped dome portions such that yarn main axes of the first yarns extend in the circumferential direction of the liner and second yarns arranged on the body and the curved shaped dome portions such that yarn main axes of the second yarns extend in the axial direction of the liner, wherein an arrangement pitch of adjacent ones of the first yarns in each of the curved shaped dome portions is larger than an arrangement pitch of adjacent ones of the first yarns in the body, and
a total number of the first yarns or the second yarns that exist per unit length in the axial direction of the liner is smaller in the curved shaped dome portions than in the body.

2. The pressure vessel according to claim 1 , wherein
each curved shaped dome portion includes a first dome portion and a second dome portion, wherein the first dome portion is located further away from the body in the axial direction of the liner than the second dome portion and
an arrangement pitch of adjacent ones of the first yarns in the second dome portion is smaller than an arrangement pitch of adjacent ones of the first yarns in the first dome portion.

3. The pressure vessel according to claim 1 , wherein the second yarns include long yarns extending in the axial direction of the liner over the entire body and the entire curved shaped dome portions and short yarns extending in the axial direction of the liner over the entire body and in a shorter range than the long yarns.

4. The pressure vessel according to claim 3 , wherein the short yarns include first short yarns extending in the axial direction of the liner over the entire body and a part of the curved shaped dome portions and second short yarns extending in the axial direction of the liner in a shorter range than the first short yarns.

5. The pressure vessel according to claim 4 , wherein the second yarns are arranged in an order of the long yarns, the first short yarns, and the second short yarns in the circumferential direction of the liner.

6. The pressure vessel according to claim 1 , wherein the second yarns include long yarns extending in the axial direction of the liner over the entire body and the entire curved shaped dome portions and short yarns that extend in the axial direction of the liner over the entire body and do not extend over the curved shaped dome portions.

7. The pressure vessel according to claim 6 , wherein the second yarns further include intermediate yarns extending in the axial direction of the liner over the entire body and a part of the curved shaped dome portions.

8. The pressure vessel according to claim 7 , wherein the second yarns are arranged in an order of the long yarns, the intermediate yarns, and the short yarns in the circumferential direction of the liner.

9. A method for manufacturing a pressure vessel, the method comprising:
preparing a liner including a cylindrical body and curved shaped dome portions continuous at each end of the body in an axial direction; and
covering an outer side of the liner with a reinforced fiber sheet made of fabric, the covering the liner with the reinforced fiber sheet including:
arranging a plurality of first yarns adjacent to one another in an axial direction of the liner over the body and the curved shaped dome portions, the first yarns extending from the liner in a direction orthogonal to the axial direction of the liner;
weaving the reinforced fiber sheet by repeatedly inserting second yarns extending in the axial direction of the liner into sheds created between adjacent ones of the first yarns in the axial direction of the liner and pushing the second yarns toward the liner through a beat-up motion; and
winding the woven reinforced fiber sheet onto the liner by rotating the liner about a central axis of the liner concurrently with the weaving of the reinforced fiber sheet,

wherein the arrangement of the first yarns in the axial direction of the liner or the insertion of the second yarns into the sheds are performed such that a total number of the first yarns or the second yarns that exist per unit length in the axial direction of the liner becomes smaller in the curved shaped dome portions than in the body, and
wherein the first yarns are arranged in the axial direction of the liner such that an arrangement pitch of the first yarns in an arrangement portion for the curved shaped dome portions becomes larger than an arrangement pitch of the first yarns in an arrangement portion for the body.

10. The method according to claim 9 , wherein the insertion of the second yarns into the sheds is performed in a long yarn range extending over the entire body and the entire curved shaped dome portions in the axial direction of the liner and in a short yarn range that extends over the entire body and does not extend over the curved shaped dome portions in the axial direction of the liner.

Assignees

• Toyota Jidoshokki Kk

Inventors

• Kamiya Ryuta

Classifications

• B29C63/0004

  Component parts, details or accessories; Auxiliary operations · CPC title

• B29C70/222

  the structure being shaped to form a three dimensional configuration · CPC title

• F17C1/06 Primary

  built-up from wound-on bands or filamentary material, e.g. wires · CPC title

• F17C2203/0675

  with details of composition · CPC title

• F17C2203/0619

  with two layers · CPC title