Air-Gap Insulated Exhaust Line Element for Heat Loss Reduction
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Solution Overview
Problem
Existing line elements in exhaust systems face challenges in minimizing temperature losses of hot, gaseous media, particularly in the cold start phase, which affects the effectiveness of exhaust gas aftertreatment and compliance with emission regulations.
Innovation Solution
A line element with air gap insulation is designed, featuring an inner and outer hose formed from wound profiled bands with radial projections that create a defined gap, which can be filled with thermal insulation material, and may be configured as spiral-wound bellows with varying diameters and wall thicknesses, providing enhanced thermal insulation and structural stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If thermal insulation is improved to minimize temperature losses, then aftertreatment effectiveness is improved, but device complexity increases
Solution Approach 1:
The hose is segmented into inner and outer hoses with an intermediate space between them, creating a multi-layer structure that enables thermal insulation through the air gap while maintaining flexibility and avoiding complex rigid insulation systems
Solution Approach 2:
An intermediate space (air gap) is introduced between the inner and outer hoses to act as a thermal insulator, reducing heat transfer from the hot exhaust gas to the external environment without requiring additional insulation materials or complex structures
2Temperature
If thermal insulation is enhanced to maintain lower exhaust gas temperatures, then emission compliance is improved, but manufacturing complexity increases
Solution Approach 1:
The hose geometry is modified by adding radial projections that create a defined air gap, changing the physical parameters of the hose structure to provide thermal insulation while using standard manufacturing processes for forming the profiled bands
Solution Approach 2:
The hose system uses a composite structure combining inner hose, outer hose, and air gap intermediate space, leveraging the insulating properties of air while maintaining the flexibility and durability of the hose construction through a multi-layer design
3Loss of energy
If a defined air gap is created to reduce heat transfer, then thermal insulation is improved, but structural stability may be compromised
Solution Approach 1:
The hose employs curved, flexible construction with spiral windings and corrugations that provide structural stability while accommodating the air gap, allowing the hose to bend and flex without compromising the integrity of the intermediate space or the overall structure
Solution Approach 2:
The hose uses flexible inner and outer hose layers that maintain structural integrity while allowing the intermediate air gap to remain defined, providing both thermal insulation and mechanical flexibility for installation in various positions and configurations
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 effectively minimizes temperature losses and stabilizes the line element, enabling rapid exhaust gas aftertreatment and compliance with emission regulations by maintaining lower exhaust gas temperatures and reducing heat-up time.
Implementation Method 1
line element with air gap insulation
Data Source
AI summary
A line element for an exhaust pipe includes an inner hose, and an outer hose which is disposed in surrounding relation to the inner hose such as to form an intermediate space. At least one of the inner and outer hoses is formed from a wound profiled band. The band includes a radial projection which projects into the intermediate space and forms a spacer between the inner hose and the outer hose.