Hydrogen Hose Reinforcement Segmentation
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Solution Overview
Problem
Hydrogen-dispensing hoses face challenges in maintaining pressure resistance and durability due to internal-pressure-induced dimensional changes and disruption of the reinforcing layer at the crimped section, especially when subjected to high hydrogen pressures and low temperatures, which can lead to brittleness and reduced lifespan.
Innovation Solution
A hydrogen-dispensing hose design featuring a coaxially layered structure with an inner surface layer of thermoplastic resin for hydrogen gas barrier properties, an outer surface layer, and at least two reinforcing layers, including a wire braided outermost layer and fiber braided layers, which enhances pressure resistance and flexibility while suppressing dimensional changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the reinforcing layer is made from metal material to improve pressure resistance, then the pressure resistance is improved, but the metal becomes brittle due to hydrogen exposure, reducing hose life
Solution Approach 1:
The reinforcing layer is segmented into multiple layers with different materials: the outermost layer uses metal wires for superior pressure resistance, while inner layers use hydrogen-resistant fibers (PBO, aramid, or carbon) that are not exposed to hydrogen. This segmentation allows each material to perform its optimal function without the drawbacks of hydrogen embrittlement affecting the metal.
Solution Approach 2:
Hydrogen-resistant fiber layers act as intermediaries between the hydrogen environment and the metal reinforcing layer. These fiber layers prevent direct hydrogen exposure to the metal, eliminating the hydrogen embrittlement problem while maintaining the metal's pressure resistance capabilities.
2Reliability
If the crimping force is increased to improve leak resistance and seal integrity of the hose fitting, then the seal integrity is improved, but the braided structure of the reinforcing layers is disrupted
Solution Approach 1:
The multi-layer composite reinforcing structure combines metal wires with hydrogen-resistant fibers in a braided configuration. This composite structure provides both the necessary strength to withstand crimping forces and maintain seal integrity, and the structural stability to prevent disruption of the braided pattern during crimping and under internal pressure.
3Productivity
If the pressure of hydrogen flowing through the hose is increased to improve flow rate, then the hydrogen flow rate is improved, but the dimensional changes in the hose increase, promoting disruption of the braided structure
Solution Approach 1:
The multi-layer composite reinforcing structure combines metal wires with hydrogen-resistant fibers in a braided configuration. This composite structure provides both the necessary strength to withstand crimping forces and maintain seal integrity, and the structural stability to prevent disruption of the braided pattern during crimping and under internal pressure.
4Productivity
If the inner surface layer is subjected to high internal pressure to increase hydrogen flow, then the hydrogen flow rate is improved, but the inner surface layer becomes more susceptible to dimensional change and damage due to brittleness at low temperatures
Solution Approach 1:
The inner surface layer is designed with specific material properties and thickness parameters to resist dimensional changes under high pressure and low temperature conditions. The layer's physical parameters are optimized to maintain flexibility and prevent damage despite the harsh operating conditions of high internal pressure and sub-freezing temperatures.
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
The design significantly improves pressure resistance and durability by preventing disruption of the braided structure and reducing hydrogen embrittlement, allowing for increased hydrogen flow rates and extended hose life while maintaining flexibility and resistance to internal pressure.
Implementation Method 1
the inner surface layer being formed from a thermoplastic resin having a dry hydrogen gas permeability coefficient at 90° C. of 1×10−8 cc·cm/cm2·sec.·cmHg or less
Data Source
AI summary
Provided is a hydrogen-dispensing hose. At least two reinforcing layers are coaxially layered between an inner surface layer of a thermoplastic resin having a dry hydrogen gas permeability coefficient at 90° C. of 1×10−8 cc·cm/cm2·sec.·cmHg or less and an outer surface layer of a thermoplastic resin. A wire braided layer formed by braiding metal wires is used as the outermost reinforcing layer. Fiber braided layers formed by braiding high-strength fibers such as polyparaphenylene benzobisoxazole fibers are used as the other reinforcing layers.