High-Pressure Hose Reinforcement Layout for Flexibility and Burst Pressure
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Solution Overview
Problem
Conventional high-pressure hoses face challenges in achieving high burst pressure while maintaining flexibility and minimizing length and twist variation, particularly in applications requiring large bore sizes and low bending stiffness, which often results in compromises between these competing requirements.
Innovation Solution
A high-pressure hose design featuring at least four helically laid reinforcing plies with adjacent plies directed in the same direction and the follow-up ply pair laid in the opposite sense, along with equal or different filament pitches, reduces shear stress and bending stiffness by avoiding 'scissoring' and allowing lower cable laying diameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional alternating left-right reinforcing plies are used, then burst pressure is maximized, but flexibility deteriorates and bending stiffness increases
Solution Approach 1:
The patent applies asymmetry by using adjacent reinforcing plies directed in the same direction rather than alternating directions. This asymmetric arrangement eliminates the scissoring effect that occurs with alternating plies during bending, thereby improving flexibility and reducing bending stiffness while maintaining burst pressure performance through proper ply configuration
Solution Approach 2:
The patent changes the dimensional arrangement of reinforcing plies from alternating left-right directions to adjacent plies in the same direction with follow-up pairs in opposite sense. This dimensional reconfiguration reduces the cable laying diameter and allows the hose to achieve lower bending stiffness without compromising strength
2Strength
If hose construction is optimized for highest burst pressure, then strength is improved, but flexibility deteriorates
Solution Approach 1:
The patent applies local quality by making different parts of the reinforcement structure serve different functions. Adjacent plies are directed in the same direction to provide local flexibility and reduce bending stiffness, while follow-up ply pairs are laid in opposite sense to maintain overall burst pressure resistance. This localized functional differentiation resolves the contradiction between strength and flexibility
3Quantity of substance
If large bore size is required, then fluid flow capacity is improved, but bending stiffness increases and flexibility deteriorates
Solution Approach 1:
For large bore hoses, the patent applies asymmetry by using adjacent reinforcing plies in the same direction, which eliminates the scissoring effect that would otherwise increase bending stiffness. This asymmetric arrangement allows large bore hoses to maintain low bending stiffness and high flexibility, making them easier to install while preserving fluid flow capacity
Data Source
AI summary
The present invention concerns a high-pressure hose comprising a liquid and gas tight inner liner made from rubber, plastic or thermoplastic elastomer, at least four helically laid reinforcing plies embedded in polymer material, and an outer cover layer made from rubber, plastic or thermoplastic elastomer, wherein adjacent reinforcing cable plies are directed in the same direction and the follow-up ply pair is laid in opposite sense. Additionally, the pitch of filaments of adjacent unidirectional reinforcement plies is the same and the number of filaments is equal or different. The present invention further concerns methods for the production of such hoses and the use of such hoses.