Pressure vessel

Patent metadata

Field	Value
Publication number	US-11543079-B2
Application number	US-201816759148-A
Country	US
Kind code	B2
Filing date	Oct 26, 2018
Priority date	Oct 27, 2017
Publication date	Jan 3, 2023
Grant date	Jan 3, 2023

Abstract

A pressure vessel (10) is provided with: a cylinder part (1) that defines a pressure chamber (11); a screwing part (3) that is disposed inside at least one of the two ends of the cylinder part; a lid (2) that has a pressure-receiving surface (2A) facing the pressure chamber and that is disposed at a position closer to the pressure chamber than is the screwing part; and a reinforcing ring (4) that is fitted to the outer circumferential surface of the cylinder part. The reinforcing ring covers, along the axial direction of the cylinder part, a part on an outer circumferential surface (1F) corresponding to a portion or the entirety of the engaging portion (12) between the cylinder part and the screwing part.

First claim

The invention claimed is:

1. A pressure vessel comprising:
a cylinder portion defining an accumulator chamber therein;
a screwable portion arranged inside of both end portions of the cylinder portion in an axial direction of the cylinder portion, an outer peripheral portion of the screwable portion being screw-threaded into an inner peripheral portion of the cylinder portion;
a lid portion arranged at a position closer to the accumulator chamber than the screwable portion and comprising a pressure receiving surface facing the accumulator chamber; and
a reinforcing ring fitted to an outer peripheral surface of the cylinder portion at each of the both end portions of the cylinder portion, the reinforcing ring covering a portion of the outer peripheral surface corresponding to an entirety of a screw-threaded portion of the cylinder portion and the screwable portion along the axial direction of the cylinder portion.

2. The pressure vessel according to claim 1 , further comprising:
a seal portion sealing a gap between the lid portion and the cylinder portion,
wherein the reinforcing ring is configured such that an end portion of the reinforcing ring on an accumulator chamber side in the axial direction is positioned at a position on the outer peripheral surface corresponding to the seal portion, or at a position closer to the accumulator chamber side in the axial direction than the position on the outer peripheral surface corresponding to the seal portion.

3. The pressure vessel according to claim 1 ,
wherein the reinforcing ring is configured such that an end portion of the reinforcing ring on an opposite side to the accumulator chamber in the axial direction is positioned at a position on the outer peripheral surface corresponding to an end portion of the screw-threaded portion on an opposite side to the accumulator chamber, or at a position farther away from the accumulator chamber in the axial direction than the position on the outer peripheral surface corresponding to the end portion of the screw-threaded portion on the opposite side to the accumulator chamber.

4. The pressure vessel according to claim 1 ,
wherein a difference between the maximum value and the minimum value of a stress generated in the screw-threaded portion is 300 MPa or less in a case where a pressure in the accumulator chamber varies in a range between 50 MPa to 82 MPa.

5. The pressure vessel according to claim 1 ,
wherein the reinforcing ring is fitted to the cylinder portion in a state of exerting a compressive stress so as to tighten the cylinder portion.

6. The pressure vessel according to claim 1 ,
wherein a thickness of the reinforcing ring in a radial direction of the cylinder portion is between 5% to 10% of an outer diameter of the cylinder portion.

7. The pressure vessel according to claim 1 ,
wherein the lid portion comprises an extending portion expanding radially outward of the cylinder portion,
wherein the screwable portion comprises a recessed portion recessed radially outward,
wherein the extending portion and the recessed portion abut against each other in the axial direction, and
wherein an outer peripheral edge of the screwable portion on an accumulator chamber side and the lid portion are separated from each other in the axial direction.

8. The pressure vessel according to claim 1 ,
wherein the cylinder portion has a straight tubular and cylindrical shape.

9. The pressure vessel according to claim 1 ,
wherein a fatigue crack life is not less than 400,000 times in a case where an annular crack having a depth of 0.1 mm is assumed as an initial assumed crack in the screw-threaded portion of the cylinder portion, in fatigue crack propagation analysis according to Standard for Ultra High-Pressure Gas Equipment KHKS 0220 (2010) defined by the High Pressure Gas Safety Institute of Japan.

10. The pressure vessel according to claim 1 ,
wherein an end portion of the reinforcing ring on an accumulator chamber side extends to a position corresponding to a portion separated by a predetermined distance from the seal portion to the accumulator chamber side, so that the reinforcing ring covers the portion of the outer peripheral surface corresponding to the whole of the screw-threaded portion of the cylinder portion and the screwable portion along the axial direction of the cylinder portion.

11. The pressure vessel according to claim 1 ,
wherein the reinforcing ring is made of metal.

12. A pressure vessel comprising,
a cylinder portion defining an accumulator chamber therein;
a screwable portion arranged inside at least one of both end portions of the cylinder portion, an outer peripheral portion of the screwable portion being screw-threaded into an inner peripheral portion of the cylinder portion;
a lid portion arranged at a position closer to the accumulator chamber than the screwable portion and comprising a pressure receiving surface facing the accumulator chamber;
a reinforcing ring fitted to an outer peripheral surface of the cylinder portion, the reinforcing ring covering a portion of the outer peripheral surface corresponding to an entirety of a screw-threaded portion of the cylinder portion and the screwable portion along an axial direction of the cylinder portion; and
a seal portion sealing a gap between the lid portion and the cylinder portion,
wherein the reinforcing ring is configured such that the end portion of the reinforcing ring on the accumulator chamber side in the axial direction is positioned at a position closer to the accumulator chamber side in the axial direction than a position on the outer peripheral surface corresponding to the seal portion.

13. The pressure vessel according to claim 12 ,
wherein the reinforcing ring is configured such that an end portion of the reinforcing ring on an opposite side to the accumulator chamber in the axial direction is positioned at a position farther away from the accumulator chamber in the axial direction than the position on the outer peripheral surface corresponding to the end portion of the screw-threaded portion on the opposite side to the accumulator chamber.

Assignees

• Japan Steel Works Ltd
• Univ Tokyo Denki
• Japan Steel Works M&E Inc

Inventors

• Wada Yoru
• HOSOYA Takafumi
• Tsuji Hirokazu

Classifications

• F17C2221/012

  Hydrogen · CPC title

• F17C2270/0184

  Fuel cells · CPC title

• F17C2260/011

  Improving strength · CPC title

• F17C2209/228

  by screws, bolts or rivets · CPC title

• F17C13/002 Primary

  for vessels under pressure (F17C13/008 and F17C13/02 - F17C13/12 take precedence) · CPC title