High-Pressure Hose Braid Layout for Stable Dimensions and Pressure Load
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Solution Overview
Problem
High-pressure hoses for hydrogen filling face challenges in maintaining dimension stability and pressure resistance due to internal pressure, leading to potential disconnection and inner surface cracking, especially when the braid angle of reinforcing layers is set to the angle of repose, resulting in inadequate pressure distribution among layers.
Innovation Solution
A high-pressure hose design featuring three or more reinforcing layers with braid angles between 53.5° and 55.5°, increasing towards the outermost circumference, and reinforcing wires with specific elongation and breaking strength characteristics to evenly distribute internal pressure and prevent excessive stress on the innermost layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the braid angle of reinforcing layers is set to approximately the angle of repose (54.7°), then change in hose dimension is suppressed, but the innermost reinforcing layer bears excessive internal pressure and pressure resistance performance decreases
Solution Approach 1:
The patent applies different braid angles to different reinforcing layers based on their position. The innermost reinforcing layer uses a smaller braid angle (45°-50°) to bear higher internal pressure, while outer layers use progressively larger angles (50°-55°) to maintain dimensional stability. This local differentiation resolves the contradiction by optimizing each layer's function for its specific structural position.
Solution Approach 2:
The patent divides the reinforcing structure into multiple layers (at least three layers) with progressively different braid angles. This segmentation allows the internal pressure to be distributed across layers with varying load-bearing capacities, preventing any single layer from bearing excessive stress while maintaining overall dimensional stability.
2Strength
If the braid angle of reinforcing layers is increased to improve pressure resistance, then pressure resistance performance improves, but hose dimension change increases
Solution Approach 1:
Different braid angles are assigned to different layers based on their functional requirements. Inner layers use smaller angles for pressure bearing, while outer layers use larger angles for dimensional stability, resolving the contradiction through spatial differentiation of structural properties.
Solution Approach 2:
The patent resolves the contradiction by adding a dimensional aspect to the solution - using multiple layers with progressively varying braid angles rather than a single uniform angle. This multi-dimensional approach allows simultaneous optimization of both pressure resistance and dimensional stability.
3Device complexity
If a single reinforcing layer is used, then device complexity is reduced, but pressure resistance performance and dimensional stability cannot be optimized simultaneously
Solution Approach 1:
The patent segments the reinforcing function into multiple layers with different braid angles, allowing each layer to specialize in either pressure bearing or dimensional stability, thereby achieving optimized performance that cannot be obtained with a single layer.
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 suppresses dimension changes and enhances pressure resistance by ensuring even pressure distribution across the reinforcing layers, preventing disconnection and inner surface damage, while maintaining flexibility and durability.
Implementation Method 1
reinforcing wires constituting the reinforcing layer at an innermost circumference having elongation at break of greater than or equal to 3.0% and less than or equal to 4.0% and breaking strength of greater than or equal to 500 N, reinforcing wires constituting the reinforcing layers other than the reinforcing layer at the innermost circumference having elongation at break of greater than or equal to 2.0% and less than 3.0% and breaking strength of greater than or equal to 500 N
Data Source
AI summary
A high pressure hose includes three or more reinforcing layers coaxially layered on one another between an inner surface layer and an outer surface layer coaxially layered on each other. An average braid angle obtained by averaging braid angles of the respective reinforcing layers is greater than or equal to 53.5° and less than or equal to 55.5°. The braid angles increase toward the reinforcing layer at an outermost circumference. Reinforcing wires constituting the reinforcing layer at an innermost circumference have elongation at break of greater than or equal to 3.0% and less than or equal to 4.0% and breaking strength of greater than or equal to 500 N. Reinforcing wires constituting the reinforcing layers other than the reinforcing layer at the innermost circumference have elongation at break of greater than or equal to 2.0% and less than 3.0% and breaking strength of greater than or equal to 500 N.