Hydrogen-Filling Hose Structure for High Flow and Embrittlement Control
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Solution Overview
Problem
Hydrogen-filling hoses face challenges in increasing high-pressure hydrogen gas flow rates while maintaining sufficient pressure resistance and preventing hydrogen embrittlement of metal wire reinforcing layers.
Innovation Solution
A hydrogen-filling hose design featuring a large diameter flow path (10 mm to 25 mm) with a thermoplastic resin inner surface layer and multiple spiral structured metal wire reinforcing layers, along with dispersed pricking holes in the outer surface layer to enhance gas permeation resistance and prevent embrittlement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the inner diameter of the hose is increased to increase the flow rate of high-pressure hydrogen gas, then the flow rate increases, but the burst pressure of the hose decreases
Solution Approach 1:
The hose employs a composite structure combining multiple layers including an inner layer made of hydrogen gas-permeation-resistant material, intermediate layers, and an outer layer, with reinforcing layers integrated throughout. This composite construction allows the hose to maintain high burst pressure while accommodating a large inner diameter (10-25mm) for high flow rate hydrogen gas transmission.
2Productivity
If the inner diameter of the hose is increased to supply larger amount of hydrogen gas, then the flow rate increases, but the amount of hydrogen gas permeation increases
Solution Approach 1:
The inner layer is constructed from composite materials specifically selected for their low hydrogen gas permeation properties, allowing the hose to have a large inner diameter for high flow rate while minimizing hydrogen gas permeation losses through the hose walls.
Solution Approach 2:
The hose structure applies different material properties to different layers: the inner layer uses materials with excellent hydrogen gas barrier properties to prevent permeation, while the outer layers focus on mechanical strength and flexibility, creating localized functional optimization throughout the hose structure.
3Strength
If the reinforcing layer is formed of metal wire material to improve pressure resistance, then the pressure resistance performance improves, but the metal wire material easily embrittles by hydrogen gas
Solution Approach 1:
The reinforcing layers are constructed using composite materials that combine metal wires with protective coatings or alternative materials that resist hydrogen embrittlement. This allows the hose to maintain high pressure resistance performance while preventing the metal wire components from deteriorating due to hydrogen gas exposure.
Solution Approach 2:
The inner layer acts as an intermediary barrier between the hydrogen gas and the metal wire reinforcing layers, preventing direct contact between hydrogen and the metal. This intermediary layer protects the metal wires from hydrogen embrittlement while still allowing the reinforcing structure to provide necessary pressure resistance.
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 increases high-pressure hydrogen gas flow rates while ensuring sufficient pressure resistance and reducing hydrogen embrittlement, allowing for efficient and safe supply of hydrogen gas to fuel cell vehicles.
Implementation Method 1
the inner surface layer is formed of a thermoplastic resin having a gas permeation coefficient of dry hydrogen gas, which is 1×10−8 cc·cm/cm2·sec.·cmHg or less at 90° C.
Implementation Method 2
the reinforcing layer is formed of a metal wire material is more advantageous than forming that from fibers in reliably transferring force to adjacent layers and improving pressure resistance efficiency
Implementation Method 3
Pricking holes extending through the outer surface layer in a thickness direction are dispersedly disposed. the hydrogen gas that has passed through the inner surface layer smoothly and easily flows out of the hose, which is advantageous in suppressing hydrogen embrittlement of the metal wire material.
Data Source
AI summary
A hydrogen-filling hose includes reinforcing layers provided coaxially layered between an inner surface layer and an outer surface layer that are coaxially layered. The inner surface layer is formed of a thermoplastic resin and has a gas permeation coefficient of dry hydrogen gas of 1×10−8 cc·cm/cm2·sec.·cmHg or less at 90° C. A flow path formed by the inner surface layer has a diameter of 10 mm or more and 25 mm or less. The reinforcing layers includes four layers or more and eight layers or less, and each of the reinforcing layers has a spiral structure that is formed by spirally winding a metal wire material. Pricking holes extending through the outer surface layer in a thickness direction are dispersedly provided therein.