High-pressure vessel liner with composite outer layer
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Solution Overview
Problem
The production of high-pressure vessels with folded-back liner ends is costly due to complex manufacturing methods, and alternative simple-shaped liners require additional sealing measures to maintain sufficiency.
Innovation Solution
A high-pressure vessel design featuring a cylindrical liner made of a first resin with an outer layer of a second resin having a lower linear expansion coefficient, integrated with a metal ferrule and seal member to ensure simple production and maintain sealability, while restraining expansion and shrinkage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the end portion of the liner is folded back inwardly to ensure sealability, then sufficient sealability between the liner and ferrule is achieved, but the production cost increases due to complex manufacturing methods
Solution Approach 1:
Instead of folding the liner end back inwardly to achieve sealing, the patent inverts the approach by using a seal member disposed in a groove on the inner peripheral surface of the liner. The ferrule presses against the seal member to create the seal, reversing the conventional sealing mechanism and enabling simple cylindrical liner production through extrusion molding.
2Ease of manufacture
If a liner with a simple cylindrical shape is used to reduce production cost, then production simplicity and cost are improved, but additional sealing measures are required to maintain sufficient sealability
Solution Approach 1:
The patent segments the sealing function from the liner structure by introducing a separate seal member that is disposed in a groove on the inner peripheral surface of the liner. This allows the liner to maintain a simple cylindrical shape for easy production while the dedicated seal member provides the sealing function, separating structural simplicity from sealing functionality.
3Stability of the object's composition
If the liner and outer layer are joined in an integrated manner to restrain expansion and shrinkage, then liner dimensional stability is improved, but the complexity of the multi-layer structure increases
Solution Approach 1:
The patent employs composite materials by joining the liner (first resin) and outer layer (second resin with lower linear expansion coefficient) in an integrated manner. The outer layer acts as a constraint that restrains the expansion and shrinkage of the liner due to temperature changes, utilizing the different thermal expansion properties of the two materials to achieve dimensional stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for the production of high-pressure vessels with simple-shaped liners at reduced costs, maintaining sufficient sealability and preventing liner expansion and shrinkage-related seal member abrasion.
Implementation Method 1
The outer layer is made of a second resin having a linear expansion coefficient that is lower than a linear expansion coefficient of the first resin... the liner expands and shrinks in the axial direction with respect to the outer layer... expansion and shrinkage of the liner in the axial direction are restrained (i.e., at least partially prevented) by the outer layer
Implementation Method 2
The seal member is disposed between the inner peripheral surface of the liner and the ferrule... the seal member seals a gap between the inner peripheral surface of the liner and the ferrule
Data Source
AI summary
A high-pressure vessel includes a liner, an outer layer, a ferrule, and a seal member. The liner has a cylindrical shape, and is made of a first resin. The outer layer is joined to an outer peripheral surface of the liner, and is made of a second resin having a linear expansion coefficient that is lower than a linear expansion coefficient of the first resin. The ferrule is made of metal, is at least partly disposed radially inward of an inner peripheral surface of the liner, and is configured to provide communication between an internal space of the high-pressure vessel and an outside of the high-pressure vessel. The seal member is disposed between the inner peripheral surface of the liner and the ferrule, and is configured to seal a gap between the inner peripheral surface of the liner and the ferrule.