Extensible Hose Sheath Structure to Prevent Creases and Bursts
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Solution Overview
Problem
Conventional axially extensible hoses develop creases in their woven sheaths due to shrinkage, leading to aesthetic issues, increased transverse dimensions, and weak points that can burst under water pressure, compromising the hose's structural integrity and reeling functionality.
Innovation Solution
The hose apparatus features a radial and axial extensible design with a protective tube wrapped by a sheath containing elastic warps and non-elastic wefts arranged in alternating helical and S-shaped patterns, which confines radial expansion while allowing axial extension and shrinkage, ensuring robustness and aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a conventional elastic hose is inserted in a non-elastic woven sheath, then the hose can be axially extensible due to water pressure, but creases or wrinkles occur on the woven sheath when it shrinks with the elastic hose
Solution Approach 1:
The patent changes the physical parameters of the sheath material from non-elastic to elastic by using elastomeric material with specific elasticity properties. This allows the sheath to stretch and shrink without forming creases, resolving the contradiction between axial extensibility and surface smoothness.
Solution Approach 2:
The patent uses a composite structure consisting of an inner elastic hose, a middle protective tube, and an outer elastic sheath. This multi-layer composite design allows each layer to contribute specific properties: the inner hose provides flexibility, the protective tube provides structural support, and the outer elastic sheath prevents crease formation while maintaining axial extensibility.
2Length of moving object
If the woven sheath shrinks with the elastic hose, then creases occur, but the transverse dimension of the woven sheath increases
Solution Approach 1:
The patent changes the elasticity parameter of the sheath material to match the expansion characteristics of the inner hose. This coordinated elasticity parameter allows the sheath to expand axially without increasing transverse dimension, resolving the contradiction between axial extensibility and transverse dimension stability.
3Shape
If creases occur on the woven sheath, then the hose apparatus becomes aesthetically unpleasant, but creases create weak points that can burst under water pressure
Solution Approach 1:
The patent changes the material parameter from non-elastic woven fabric to elastic elastomeric material. This parameter change eliminates crease formation entirely, simultaneously improving both aesthetic appearance and burst resistance, as the elastic material distributes stress uniformly without creating weak points.
4Length of moving object
If the transverse dimension of the woven sheath increases due to creases, then the reeling of the hose apparatus is affected, but the axial extensibility is maintained
Solution Approach 1:
The patent changes the dimensional stability parameter of the sheath by using elastic material that maintains constant transverse dimension during axial expansion. This resolves the contradiction by allowing axial extensibility while preventing transverse dimension increase, thereby maintaining reeling efficiency.
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 prevents creases, maintains a stable transverse dimension, and enhances the hose's durability by distributing stress evenly, preventing bursts and ensuring efficient reeling and water pressure management.
Implementation Method 1
The sheath includes elastic warps and non-elastic weft. The elastic warps extend parallel to the protective tube.
Data Source
AI summary
An extensible hose includes a hose, a protective tube and a sheath. The hose is expansible in a radial manner and extensible in an axial manner. The protective tube is expansible in a radial manner and extensible in an axial manner, wherein the protective tube wraps the hose. The sheath wraps the protective tube. The sheath includes elastic warps and non-elastic weft. The elastic warps extend parallel to the protective tube. The non-elastic wefts sorted into a first group and a second group. The non-elastic wefts in the first group extend around the elastic warps in a right-hand helical manner and in an S-shaped manner. The non-elastic wefts in the second group extend around the elastic warps in a left-hand helical manner and in an S-shaped manner.