High-Pressure Hydrogen Container Sealing Layout Against Thread Cracking
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Solution Overview
Problem
High-pressure hydrogen containers face damage due to hydrogen diffusion into the metallic structure, leading to stress concentration and cracking at the female thread portion and the periphery of the abutting face.
Innovation Solution
The high-pressure hydrogen container design includes a cylinder body with a sealing surface and a lid member with a sealing portion that abuts the sealing surface, ensuring a distance relationship where H<L, thereby minimizing the impact of hydrogen diffusion on the metallic structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resinous sealing member is used to seal the cylinder, then sealing is achieved, but hydrogen passes through the sealing member and causes hydrogen-induced damage at the female thread portion
Solution Approach 1:
A through-hole is provided in the gap portion between the female thread portion and the resinous sealing member to act as an intermediary drainage path. This allows hydrogen that penetrates the sealing member to be discharged from the cylinder interior to the exterior, preventing hydrogen accumulation and hydrogen-induced damage at the stress-concentrated female thread portion while maintaining the sealing function of the resinous sealing member.
2Strength
If the lid is fixed to the cylinder end portion with thread engagement, then the lid is secured, but stress concentration occurs at the female thread portion and abutting face periphery
Solution Approach 1:
The through-hole serves as a mediator by providing a drainage path for hydrogen away from the stress-concentrated regions (female thread portion and abutting face periphery). By enabling hydrogen discharge from the cylinder interior, the through-hole prevents hydrogen from accumulating in these high-stress areas, thereby reducing hydrogen-induced damage while maintaining the structural integrity and fixation strength of the lid-cylinder connection.
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 design effectively reduces the occurrence of damage such as cracking, ensuring high reliability and durability of the high-pressure hydrogen container even under high load conditions.
Implementation Method 1
hydrogen molecules that are present in a predetermined concentration in the container penetrate into a metallic structure that forms the metallic container and diffuse into the metallic structure
Data Source
AI summary
A high-pressure hydrogen container includes: a cylinder body; and a lid member that closes an end portion of the cylinder body. The cylinder body includes: a joining portion that fixes the lid member; a cylinder portion that forms an outer shell of a storage portion; and a sealing surface formed at an inner surface of the cylinder body. At least H<K is satisfied, where an area of the sealing surface which the sealing portion abuts is an abutting area, H is a thickness from the abutting area to an outer surface of the cylinder body, part of the cylinder body in which a stress greater than or equal to a predetermined stress σ is generated is a stress generation portion, and L is a distance between the abutting area and the stress generation portion.