Diving Hose Layer Separation via Composite Braiding
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Solution Overview
Problem
Low-pressure hoses for diving cylinders suffer from separation of layers when bent, leading to reduced strength and flexibility, increased stiffness, and potential blockages, as well as susceptibility to abrasion and UV aging.
Innovation Solution
A low-pressure hose with an inner polyethylene or polyurethane tubular element sheathed by a polyester braid and an outer nylon braiding layer, which provides enhanced mechanical strength, flexibility, and abrasion resistance, with stainless steel or brass rings for secure connection, preventing layer separation and ensuring flow continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an outer tubular element (PVC or polyurethane) is used to protect the polyester braid, then the hose gains protective coverage, but the outer sheath separates from the braid when bent, forming discontinuities and reducing strength
Solution Approach 1:
The invention merges the protective function and the strength-bearing function into a single integrated braid layer. The polyester braid itself is configured to provide both protection and withstand bursting pressure, eliminating the need for a separate outer tubular element that would separate during bending. This unified structure prevents layer separation while maintaining protective coverage.
Solution Approach 2:
The invention uses a composite braid structure combining polyester fibers with high tenacity nylon fibers. This composite material provides both the protective coverage needed and the structural integrity to prevent separation under bending, while withstanding bursting pressures. The multi-material braid creates a unified layer that doesn't separate like discrete tubular elements.
2Object-affected harmful factors
If two distinct tubular elements are superimposed to provide protection, then the hose gains protective coverage, but the hose stiffness increases and flexibility decreases
Solution Approach 1:
The invention combines multiple protective functions into a single braid layer rather than using superimposed tubular elements. This integrated approach maintains flexibility because the braid structure can conform to bends without creating the stiffness associated with multiple rigid layers. The single unified layer bends smoothly while still providing comprehensive protection.
3Stress or pressure
If an outer tubular element is used to withstand bursting pressure, then the hose gains pressure resistance, but bending displaces braid filaments and reduces strength characteristics
Solution Approach 1:
The invention employs a composite braid of polyester and high tenacity nylon fibers where the nylon components provide superior tensile strength and bursting pressure resistance. This composite structure maintains strength characteristics under bending because the high-performance fibers are integrated throughout the braid, not confined to a separate outer layer that would separate during flexing.
Solution Approach 2:
The pressure-resistant and strength-bearing functions are merged into the same braid structure. The high tenacity nylon fibers within the polyester braid simultaneously provide bursting pressure resistance and maintain tensile strength during bending, eliminating the trade-off between pressure resistance and bending strength.
4Object-affected harmful factors
If a PVC or polyurethane outer sheath is used, then the hose gains protective coverage, but the hose becomes susceptible to aging due to UV exposure
Solution Approach 1:
The invention uses polyester and nylon fibers in the braid structure, both of which have superior UV resistance compared to PVC and polyurethane. These natural and synthetic polymer fibers are inherently more resistant to UV degradation, extending the service life of the hose under sunlight exposure while maintaining protective coverage.
Data Source
AI summary
A low-pressure hose for connection to diving cylinders for underwater activities, comprising an inner tubular element, which is sheathed by an inner sheathing layer constituted by a polyester braid, the hose further comprising an outer sheathing layer constituted by nylon braiding.