Multi-Layer High-Pressure Hose Braid Angles for Dimension Stability
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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 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 with three or more reinforcing layers having braid angles between 53.5° and 55.5°, increasing towards the outermost circumference, and reinforcing wires with specific breaking strength and elongation at break values to evenly distribute internal pressure, preventing excessive stress on the innermost layer and maintaining dimension stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the braid angle of each reinforcing layer 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 local quality by setting different braid angles for different reinforcing layers. The innermost reinforcing layer has a braid angle of 56-58° (higher than angle of repose) to reduce pressure bearing, while the outermost layer has 52-54° (lower than angle of repose) for optimal pressure resistance. This non-uniform distribution allows each layer to have optimized properties for its specific position and pressure load.
Solution Approach 2:
The patent changes the braid angle parameter across different reinforcing layers to resolve the contradiction. By varying the braid angle from the standard angle of repose (54.7°) to higher values in inner layers and lower values in outer layers, the patent achieves both dimension stability and improved pressure resistance performance.
2Stability of the object's composition
If the braid angle is increased to suppress hose dimension change under internal pressure, then dimension stability improves, but the innermost layer bears excessive pressure reducing overall pressure resistance
Solution Approach 1:
The patent applies local quality by setting different braid angles for different reinforcing layers. The innermost reinforcing layer has a braid angle of 56-58° (higher than angle of repose) to reduce pressure bearing, while the outermost layer has 52-54° (lower than angle of repose) for optimal pressure resistance. This non-uniform distribution allows each layer to have optimized properties for its specific position and pressure load.
Solution Approach 2:
The patent changes the braid angle parameter across different reinforcing layers to resolve the contradiction. By varying the braid angle from the standard angle of repose (54.7°) to higher values in inner layers and lower values in outer layers, the patent achieves both dimension stability and improved pressure resistance performance.
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 distribution of internal pressure across the reinforcing layers, preventing disconnection and surface damage, and extending the hose's lifespan.
Implementation Method 1
an internal pressure acting on the hose can be transmitted efficiently from the reinforcing layer at the innermost circumference to the reinforcing layer at the outermost circumference
Implementation Method 2
when the braid angle of a reinforcing layer embedded in the hose is set to approximately an angle of repose (54.7°), there is little change in the braid angle even in a case where an internal pressure acts on the hose. Thus, change in a hose dimension can be suppressed.
Implementation Method 3
the reinforcing wires constituting each of the reinforcing layers other than a fourth reinforcing layer are set to have breaking strength of greater than or equal to 500 N and the reinforcing wires constituting the reinforcing layer at the innermost circumference are set to have larger elongation at break
Implementation Method 4
when the diameter of the hose is significantly increased at this time, there is a problem in that an inner surface layer of the hose is likely to be cracked, and further, the development rate of the crack increases to reduce the life of the hose
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
To provide a high pressure hose that can provide effectively improved pressure resistance performance while suppressing change in a hose dimension in a case where an internal pressure acts. Three or more reinforcing layers (3) are coaxially layered on one another between an inner surface layer (2) and an outer surface layer (5) coaxially layered on each other. An average braid angle obtained by averaging braid angles of the respective reinforcing layers (3) is set to be greater than or equal to 53.5° and less than or equal to 55.5°. The braid angles are set to increase toward the reinforcing layer (3) at an outermost circumference. Reinforcing wires (4a) constituting the reinforcing layer (3a) 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 (4b to 4d) constituting the reinforcing layers (3b to 3d) 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.