Hydrogen-Filling Hose Composite Structure for High-Pressure Durability
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Solution Overview
Problem
Hydrogen-filling hoses face challenges in maintaining durability and preventing hydrogen leakage at increased pressures, particularly with the rising demand for hoses that can handle pressures up to 87.5 MPa, while also requiring flexibility and resistance in low-temperature environments.
Innovation Solution
A hydrogen-filling hose design featuring an inner layer with a thermoplastic resin composition comprising a polyamide resin matrix and modified styrene-based elastomer domains, a reinforcing layer with steel wires, and an outer layer of thermoplastic elastomer, which reduces volume change under high pressure, enhances low-temperature fatigue resistance, and inhibits hydrogen permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pressure of hydrogen filling is increased to 87.5 MPa, then the filling efficiency is improved, but the durability of the hydrogen-filling hose deteriorates due to repeated high-pressure filling
Solution Approach 1:
The patent employs a composite material structure consisting of three layers: an inner layer made of polyamide 11 resin providing hydrogen barrier properties, a middle layer made of polyethylene resin providing flexibility and fatigue resistance, and an outer layer made of polyamide resin providing mechanical strength and durability. This composite structure enables the hose to withstand repeated high-pressure filling while maintaining flexibility and hydrogen barrier performance.
2Strength
If the hose is made rigid to improve durability, then the strength is improved, but the flexibility in low-temperature environment deteriorates
Solution Approach 1:
The patent employs a composite material structure where the outer layer made of polyamide resin provides mechanical strength and durability, while the middle layer made of polyethylene resin provides flexibility and fatigue resistance. This composite structure enables the hose to maintain both strength and flexibility, ensuring ease of operation in low-temperature environments.
Data Source
AI summary
Provided is a hydrogen-filling hose including an inner layer, a reinforcing layer, and an outer layer, the hydrogen-filling hose being characterized in that the inner layer includes a thermoplastic resin composition including a matrix that includes a polyamide resin and a domain that includes a modified styrene elastomer, the modified styrene elastomer content of the thermoplastic resin composition is 5-50 mass % of all polymer components in the thermoplastic resin composition, the reinforcing layer includes at least one layer that includes steel wire, and the outer layer includes a thermoplastic elastomer.