Wound Hose Ceramic Coating Process for Heat Insulation
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Solution Overview
Problem
Existing processes for manufacturing spiral wound metallic hoses are costly and prone to defects, such as the insulating layer tearing during the profiling process, leading to incomplete heat insulation and increased temperature losses in exhaust gas applications.
Innovation Solution
A process where a metal wound hose is upset to form an uninterrupted jacket surface, coated with a ceramic-based coating on axial wall areas, and then pulled apart to break the coating at partitions, ensuring the radial sections remain uncoated and maintain mobility, while providing effective heat insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a multilayer flat strip material with insulating layer is used for manufacturing wound hose, then heat insulation is improved, but the insulating layer may tear and peel off during profiling process
Solution Approach 1:
The insulating layer is applied to the metal strip surface before the profiling process. This preliminary application ensures the coating is in place before any forming operations, preventing tearing and peeling that would occur if applied afterward. The coating adheres to the smooth strip surface during coating, then remains intact through subsequent profiling and winding operations.
Solution Approach 2:
The invention changes the sequence of manufacturing parameters by applying the insulating coating before profiling rather than after. This parameter change in process sequence ensures the coating is applied to a smooth surface where it can adhere properly, and then the profiling process occurs without disturbing the coating integrity.
2Loss of energy
If a ceramic-based coating is applied to the entire wound hose, then heat insulation is improved, but the mobility of the wound hose is reduced
Solution Approach 1:
The insulating ceramic coating is applied selectively only to specific regions of the wound hose - namely the axial wall areas of the turns - while leaving other regions such as the radial connection sections uncoated. This local application provides heat insulation where needed (on the axial walls) while maintaining mobility and flexibility in the uncoated radial sections that allow the hose to bend and flex.
3Loss of energy
If a three-layer sandwich structure with heat-insulating material is used, then heat insulation is improved, but manufacturing cost increases
Solution Approach 1:
The invention extracts and eliminates the complex three-layer sandwich structure (metal-insulating material-metal) and replaces it with a simpler configuration: a single metal strip that is coated with insulating material on its surface before profiling. This extraction of the unnecessary middle metal layer and simplification of the structure reduces manufacturing complexity and cost while maintaining effective heat insulation through the ceramic-based coating.
Solution Approach 2:
The invention uses composite material construction by applying a ceramic-based insulating coating to a metal strip substrate. This composite structure combines the thermal conductivity benefits of metal with the insulating properties of ceramic material, achieving effective heat insulation without requiring a complex three-layer sandwich structure, thereby reducing manufacturing cost.
4Loss of energy
If high friction coefficient material is used for heat insulation, then heat insulation is improved, but friction between layers increases
Solution Approach 1:
The invention changes the surface parameter of the metal strip by applying a ceramic-based coating that provides both high friction coefficient for heat insulation and controlled surface properties. The coating process modifies the surface characteristics to achieve the desired balance between insulation performance and friction characteristics, preventing excessive friction between layers while maintaining thermal insulation effectiveness.
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 ceramic coating reduces heat flow from the interior to the exterior, maintaining hose mobility and preventing damage, achieving significant temperature reduction and reliable heat protection without increasing friction or manufacturing costs.
Implementation Method 1
The coating causes a reduction of the heat flow from the interior of the wound hose to its outside, especially due to a reflection of the heat radiation released by the exhaust gas and possibly also due to the selective heat conductivity of ceramic compared to the metal material of the wound hose
Implementation Method 2
The coating causes a reduction of the heat flow from the interior of the wound hose to its outside, especially due to a reflection of the heat radiation released by the exhaust gas
Data Source
AI summary
A heat-insulated wound hose is formed by a process, in which a metal wound hose is at first upset, such that turns, which are spaced apart by adjacent axial wall areas of individual turns, form at least one uninterrupted jacket wall surface. A ceramic-based coating is subsequently applied to the at least one uninterrupted jacket wall surface. The coating is then cured, and the wound hose thus formed is subsequently pulled apart, whereby adjacent axial wall areas of adjacent turns are detached from one another and thereby the coating is broken up at partitions.