Wire Spiral Reinforced Rubber Hose to Prevent Pinhole Bursts
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Solution Overview
Problem
Existing wire spiral reinforced hoses with high wire density offer high-pressure durability but are costly and lack flexibility, while those with reduced wire density suffer from pinhole bursts before the hose main body bursts, rendering them unusable.
Innovation Solution
A wire spiral reinforced rubber hose with a wire density of 40% to 80% and a wire bundle spacing of 1 mm or smaller in the reinforcing layers, formed by helically winding wire bundles divided into specific configurations, prevents pinhole bursts while maintaining moderate pressure resistance and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If wire density is high (90% or higher), then high-pressure durability is improved, but flexibility deteriorates and cost increases
Solution Approach 1:
The patent changes the wire density parameter from the conventional high range (90-100%) to a moderate range (40-80%), and simultaneously optimizes the wire bundle spacing parameter to 1mm or smaller. This parameter transformation resolves the contradiction by achieving adequate pressure resistance at moderate wire density while maintaining flexibility through controlled spacing between wire bundles.
2Ease of manufacture
If wire density is reduced below 40%, then cost decreases and flexibility improves, but pinhole burst pressure decreases below hose main body burst pressure
Solution Approach 1:
The patent establishes the wire density parameter within the specific range of 40-80% and wire bundle spacing at 1mm or smaller. This parameter optimization ensures that pinhole burst pressure remains higher than hose main body burst pressure, preventing premature pinhole bursts while maintaining cost-effectiveness and avoiding the need for excessive wire density.
Solution Approach 2:
The patent transitions from considering only wire density as a single parameter to optimizing both wire density and wire bundle spacing as two-dimensional parameters. By controlling the spacing between wire bundles to 1mm or smaller, the patent prevents fluid penetration through enlarged spacing, thereby maintaining pinhole burst resistance even at moderate wire density levels.
3Ease of manufacture
If wire bundle spacing exceeds 1mm, then manufacturing ease improves, but pinhole burst pressure decreases due to enlarged spacing between wire bundles
Solution Approach 1:
The patent optimizes the wire bundle spacing parameter to 1mm or smaller, which prevents fluid from penetrating through enlarged spacing between wire bundles. This parameter setting maintains pinhole burst pressure above hose main body burst pressure while remaining manufacturable, resolving the contradiction between manufacturing ease and reliability.
Data Source
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AI summary
Disclosed is a low-cost, flexible wire spiral reinforced rubber hose that does not cause occurrence of a pinhole burst. The wire spiral reinforced rubber hose includes a hose main body 10 that includes reinforcing layers 14, 16, 18, and 20 formed by helically wound wire bundles 31, 32 in which a plurality of metal wires 30 adjoin side by side, respectively. The wire density of the metal wires 30 in the reinforcing layers 14, 16, 18, and 20 is set at 40% or higher and 80% or lower, and the wire bundle spacing between the adjoining wire bundles 31, 32 is set at 1 mm or smaller, whereby an appropriate wire density having a pressure resistance that is not high but moderate is set.