Multi-Layer Fluid Hose Structure for Diffusion and Strength
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Solution Overview
Problem
Existing hose lines for fluids, particularly in vehicles, struggle to provide effective protection against fluid diffusion while maintaining mechanical integrity, as required by legal standards like PZEV and SULEV, without compromising mechanical or dynamic properties.
Innovation Solution
A hose line design featuring two barrier layers with different materials, one on the inside and one between the carrier layer, optimized for fluid diffusion prevention, combined with a carrier layer for mechanical support, and an electrically conductive strip for charge dissipation, along with an optional intermediate layer for enhanced mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single barrier layer is used to prevent fluid diffusion, then diffusion protection is improved, but mechanical strength and adhesion are insufficient
Solution Approach 1:
The barrier function is segmented into two separate barrier layers with different materials, each optimized for preventing diffusion of different fluid components. This segmentation allows each layer to be thin and focused on diffusion prevention while the carrier layer provides mechanical strength.
Solution Approach 2:
The hose line uses a composite structure with a carrier layer made of elastomer and two barrier layers made of different materials (e.g., F-TPV and FPM). This composite material approach allows each layer to contribute its specific properties: the carrier layer provides mechanical strength and adhesion, while the barrier layers provide diffusion protection.
2Reliability
If barrier layers are made thin for optimal diffusion protection, then diffusion prevention is improved, but mechanical strength and bonding capability are reduced
Solution Approach 1:
The carrier layer serves multiple functions: it provides mechanical strength to the hose line, ensures adhesion to the barrier layers, and allows the barrier layers to be thin and optimized for diffusion prevention. This multi-functionality resolves the contradiction between thin barrier layers and mechanical strength.
Solution Approach 2:
The carrier layer acts as an intermediary between the two thin barrier layers, providing the mechanical strength and adhesion that the thin barrier layers cannot provide themselves. This intermediary structure allows the barrier layers to be optimized for diffusion prevention without compromising mechanical integrity.
3Strength
If a carrier layer with high mechanical properties is used, then mechanical stability is improved, but fluid permeability increases
Solution Approach 1:
The hose line structure segments the functions of mechanical support and diffusion prevention into separate layers. The carrier layer is dedicated to mechanical stability while the two barrier layers are dedicated to preventing fluid diffusion, resolving the contradiction between mechanical properties and fluid permeability.
4Reliability
If two barrier layers of different materials are used to prevent diffusion of different fluid components, then diffusion protection is improved, but device complexity increases
Solution Approach 1:
The two barrier layers are merged into a single integrated hose line structure with the carrier layer, forming a multi-layer composite hose. This merging approach achieves enhanced diffusion protection while maintaining a manageable and manufacturable structure through co-extrusion or sequential extrusion 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 design effectively prevents fluid diffusion, meets legal requirements, maintains mechanical stability, and ensures electrical charge dissipation, while optimizing material usage and weight.
Implementation Method 1
a first barrier layer, in particular made of a first material, which is designed to prevent diffusion of the fluid through the wall of the hose line
Implementation Method 2
an electrically conductive strip for discharging electrical charge
Data Source
Figure 1
Figure 2
AI summary
The present invention relates to a hose (200) for a fluid, comprising a carrier layer (101), a first barrier layer (103) for preventing diffusion of the fluid, and a second barrier layer (105), wherein the first barrier layer (103) is arranged on the inside (107) of the hose (200) and the second barrier layer (105) is arranged between the first barrier layer (103) and the carrier layer (101). The present invention further relates to a method for manufacturing a hose (200).