Expandable Hose Weave Structure for Radial Restraint and Durability
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Solution Overview
Problem
Existing expandable hoses tend to fail after repeated use due to rupture of the inner elastic tube or failure at the couplers, limiting their expansion and contraction cycles, and often suffer from wear and tear issues.
Innovation Solution
A hose arrangement featuring an outer tube made from woven fabric with greater longitudinal elasticity than transverse elasticity, using polyamide yarns for the warp and polyester yarns for the weft, along with a multi-stranded longitudinal yarn structure and careful ironing and welding processes to enhance durability and control radial expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the outer tube is made of inelastic material to control radial expansion, then radial expansion control is improved, but longitudinal elasticity is reduced
Solution Approach 1:
The outer tube is constructed from a composite material comprising polyester fibers providing radial stability and polyamide fibers providing longitudinal elasticity. This composite structure allows the tube to simultaneously control radial expansion while maintaining longitudinal stretchability, resolving the contradiction between radial stability and longitudinal elasticity.
Solution Approach 2:
The patent applies different material properties to different directional requirements within the same outer tube structure. The polyester fibers are oriented to provide radial restraint while polyamide fibers are oriented to provide longitudinal elasticity, allowing localized functional differentiation within a single component.
2Adaptability or versatility
If the hose undergoes repeated expansion and contraction cycles, then expansion capacity is improved, but reliability deteriorates due to inner tube rupture or coupler failure
Solution Approach 1:
The elastomeric sleeve positioned between the inner tube and outer tube serves as a cushioning element that absorbs and distributes stress during expansion and contraction cycles. This pre-positioned protective layer prevents direct stress concentration at critical points, thereby extending the hose's service life and reducing failure risk.
Solution Approach 2:
The combination of elastomeric material for the inner tube and sleeve with the composite fiber structure of the outer tube creates a multi-material system where each layer contributes to fatigue resistance. The elastomeric components provide flexibility and stress absorption while the composite outer tube provides structural integrity, together enhancing reliability under cyclic loading.
3Ease of manufacture
If the outer tube uses conventional fabric structure, then manufacturing is simplified, but wear resistance is reduced
Solution Approach 1:
The outer tube employs a composite fabric structure combining polyester and polyamide yarns in a woven pattern. This composite construction maintains relative manufacturing simplicity while significantly improving wear resistance through the synergistic properties of the two fiber types - polyester providing dimensional stability and polyamide providing abrasion resistance.
Solution Approach 2:
The patent specifies particular yarn configurations including yarn denier, twist levels, and weave patterns to optimize the balance between manufacturability and wear resistance. By carefully controlling these parameters, the fabric achieves enhanced durability without requiring complex manufacturing processes.
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
The solution significantly increases the hose's expansion capacity and longevity by allowing more cycles of expansion and contraction, reducing wear, and providing a more gradual expansion process, resulting in a longer product lifetime and improved resistance to herniation.
Implementation Method 1
The outer tube is formed of a woven fabric comprising polyamide yarns in a warp direction and polyester yarns in a weft direction, where the warp yarns are more elastic than the weft yarns
Implementation Method 2
the outer tube is formed of a woven fabric comprising polyamide yarns in a warp direction and polyester yarns in a weft direction, where the warp yarns are more elastic than the weft yarns
Implementation Method 3
The hose has a shorter length in a non-water flow contracted state and a longer length in an expanded state where water pressure is applied to the interior of the elastic tube
Data Source
Figure 1
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AI summary
A hose arrangement comprising an outer tube (11) of flexible material and an inner tube (12) of an elastic material for carrying fluid through the hose arrangement, wherein due to the action of the elastic inner tube, the hose arrangement has a shorter length in a contracted state in the absence of fluid pressure in the interior of the inner elastic tube and a longer length in an expanded state when fluid pressure is applied to the interior of the elastic inner tube, and the outer tube has an undulating state when the hose arrangement is in the contracted state and serves to control and contain expansion of the inner tube when the hose arrangement is in the expanded state. The flexible material of the outer tube comprises a woven fabric which is woven from two types of yarn, a first type of yarn (9a) being of a first material and a second type of yarn (9b) being of a second material, which is different from the first material.