Thin Foil Encapsulated Assemblies for Exhaust Junction Insulation
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Solution Overview
Problem
Conventional exhaust after-treatment systems face challenges in effectively insulating the junction between decomposition tubes and injector tubes, leading to inefficiencies in heat retention and increased costs due to the use of double-walled tubes, which are expensive and add weight.
Innovation Solution
A tube junction housing with a receptacle portion, base flange, and thin foil insulation that surrounds the tube junction, allowing for efficient insulation without the need for a double-walled system, using a thin-walled connection surface and arcuate base flange to minimize bearing pressure on the insulation and distribute loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If double-walled tubes with insulation are used to insulate the junction between decomposition tube and injector tube, then heat retention is improved, but cost and weight increase
Solution Approach 1:
The patent applies foil insulation (thin film) wrapped around the injector tube at the junction area instead of using thick rigid insulation housings or double-walled tube structures. This thin film approach provides thermal insulation while significantly reducing weight and cost compared to conventional double-walled systems.
2Temperature
If double-walled tubes with thick insulation housings are used at the junction, then heat retention is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces complex double-walled tube structures with thick insulation housings with a simple foil wraparound design. The foil is wrapped around the injector tube and secured at the junction, creating a simple insulation solution that maintains heat retention while dramatically reducing structural complexity.
3Weight of stationary object
If no insulation is used at the junction to reduce cost and weight, then manufacturing cost and weight are reduced, but heat retention deteriorates
Solution Approach 1:
The patent applies foil insulation specifically at the junction area where heat loss is most critical. This targeted application of thin film insulation provides adequate thermal protection at the connection point between decomposition tube and injector tube while keeping the overall weight and cost low compared to insulating the entire assembly.
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 solution provides effective insulation at a lower cost and reduced weight, maintaining structural rigidity while improving heat retention and performance in exhaust after-treatment systems by using a thin foil encapsulation around the tube junction.
Implementation Method 1
thin foil spaced apart from the receiver tube and substantially surrounding the tube insulation
Data Source
AI summary
An injector tube assembly that includes thin foil insulation around a receiver tube and a relatively rigid housing secured to the thin foil and bearing on tube insulation while also being packed with junction insulation.