Fumed Silica Insulation Cover for Vehicle Catalytic Converter Heat Loss
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Solution Overview
Problem
Conventional insulation materials for catalytic converters in diesel vehicles suffer from low insulation efficiency and heat loss due to conduction and radiation, particularly in low temperature and low load conditions, which affects nitrogen oxide purification efficiency.
Innovation Solution
The use of a new insulation structure featuring a fumed silica-based insulation cover with a heatproof fabric material, including silica fabric and vermiculite, combined with a flexible ceramic cover and a hook and loop fastener, to minimize heat loss and enhance insulation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional insulation material (silica non-woven or ceramic blanket) is attached to metal thin plate or cover by welding, then the insulation material is fixed to the converter, but heat loss occurs through the welded portion and metal cover due to conduction and radiation
Solution Approach 1:
The patent introduces a new insulation cover material (fumed silica with heatproof fabric) as an intermediary that replaces the metal cover and welding connection. This intermediary material provides both fixing function and thermal insulation, eliminating the heat conduction path through metal welds while maintaining secure attachment to the converter body.
Solution Approach 2:
The patent uses composite material (fumed silica combined with heatproof fabric material) for the insulation cover. This composite structure combines the high temperature resistance of fumed silica with the structural integrity and flexibility of heatproof fabric, achieving both reliable fixing and effective thermal insulation without requiring metal components.
2Reliability
If metal insulation cover is welded on insulation material to fix it, then insulation material is secured, but heat transfer through welded portion increases heat emission to atmosphere
Solution Approach 1:
The new insulation cover acts as an intermediary that eliminates the need for metal welding. The heatproof fabric material provides mechanical fixation through alternative means (such as clamping or friction fit) while the fumed silica layer provides thermal insulation, creating a non-conductive path that prevents heat emission to atmosphere.
Solution Approach 2:
The patent replaces the mechanical welding system with a non-mechanical or alternative mechanical fixation system. Instead of using welds to attach metal covers, the insulation cover is secured through methods that do not create thermal conduction paths, such as friction fit, clamping, or interlocking structures inherent in the flexible ceramic cover design.
3Device complexity
If conventional insulation material is used, then structure is simple, but insulation effect is low and heat loss occurs
Solution Approach 1:
The patent employs composite material (fumed silica with heatproof fabric) that maintains relative structural simplicity while dramatically improving insulation performance. The composite structure allows the insulation cover to be manufactured as a single integrated component that can be directly fitted to the converter, preserving ease of installation while achieving superior thermal insulation.
Solution Approach 2:
The patent changes the material parameters of the insulation cover by using fumed silica with specific thermal properties and combining it with heatproof fabric having appropriate thickness and density. These parameter changes enhance the insulation effect without significantly complicating the overall structure, as the cover maintains its basic enveloping form.
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 significantly reduces heat loss, accelerates exhaust temperature rise, improves regeneration efficiency, and shortens regeneration time, while also reducing noise and maintaining effective nitrogen oxide purification.
Implementation Method 1
The insulation cover insulates heat generated from the LNT converter, the connecting housing and the SDPF converter
Implementation Method 2
minimize heat loss by conduction and radiation of metal insulation cover attached to converter body by welding
Implementation Method 3
minimize heat loss by conduction and radiation of metal insulation cover
Data Source
AI summary
An insulation structure of catalytic converter of vehicle according to an exemplary embodiment of the present invention includes an LNT converter. A connecting housing is provided such that a urea reducing agent is injected to the exhaust gas when it is needed. An SDPF converter reduces nitrogen oxide contained in the exhaust gas using the injected reducing agent, and SCR catalyst is coated on a filter. An insulation cover including inner surface contacts the LNT converter, the connecting housing and the SDPF converter and also includes an outer surface which is opposing surface to the inner surface and surrounds the LNT converter, the connecting housing and the SDPF converter. The insulation cover insulates heat generated from the LNT converter, the connecting housing and the SDPF converter. An insulation material is inserted and attached between the outer surface and the inner surface of the insulation cover.