Exhaust Gas Treatment Electrode Merging for Compact Sealing
Solution Overview
Problem
Conventional electrically heatable catalytic converters face challenges such as incomplete catalyst surface heating, complex electrical contacting of individual conductor tracks, poor temperature distribution, and compromised tightness due to multiple electrical contacts, especially for small substrate sizes and large catalyst surfaces.
Innovation Solution
The device simplifies power supply to conductor tracks by using electrodes that contact multiple tracks through the outer wall, eliminating the need for separate electrodes for each track, and integrates a projection in the outer wall to reduce components and leak points, allowing for a more compact and efficient electrical contacting system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate electrodes are used for each conductor track, then electrical contacting is achieved, but device complexity and number of components increase
Solution Approach 1:
Multiple separate electrodes for individual conductor tracks are merged into a single common electrode that contacts all conductor tracks simultaneously. This reduces the number of components and simplifies the electrical contacting system while maintaining reliable electrical connection to all heating elements.
Solution Approach 2:
A single common electrode is designed to serve multiple functions by establishing electrical contact with all conductor tracks through the outer wall opening. This multi-functional electrode eliminates the need for multiple specialized electrodes, reducing device complexity while ensuring comprehensive electrical contacting.
2Reliability
If multiple electrical contacts are made through the outer wall, then all conductor tracks can be contacted, but sealing is compromised
Solution Approach 1:
Multiple electrical contact points are merged into a single common electrode that accesses all conductor tracks through one opening in the outer wall. This eliminates multiple separate openings, thereby maintaining the sealing integrity of the outer wall while still enabling electrical contact with all heating elements.
Solution Approach 2:
The electrical contact function is extracted from multiple separate contact points and consolidated into a single common electrode structure. This extraction reduces the number of penetrations required in the outer wall, minimizing sealing compromises while maintaining comprehensive electrical contacting capability.
3Reliability
If insulated heating conductors are used, then electrical insulation is provided, but temperature distribution becomes poor
Solution Approach 1:
A common electrode serves as an intermediary structure that provides both electrical insulation and thermal conduction. The electrode design allows electrical insulation where needed while maintaining thermal contact with all conductor tracks, thereby achieving both electrical safety and uniform temperature distribution across the catalyst substrate.
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 reduces the number of electrodes and space requirements, enhances the device's compactness, improves sealing, and simplifies the structure and manufacturing process while maintaining effective electrical contacting and heat distribution across the catalyst surface.
Implementation Method 1
conductor tracks...allow for the electrical heating of nearly the entire substrate volume
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a device (1) for treating exhaust, said device being designed to electrically contact multiple conductor paths (5), which are arranged within an inner chamber (3) surrounded by an outer wall (2) of the device (1), through the outer wall (2). The inner chamber (3) is equipped with one or more electrodes (9, 10), which can be electrically contacted through the outer wall (2) and which electrically contact each pair or more of the conductor paths (5) in the inner chamber (3).