Metallic Heating Plate Ceramic Catalyst Exhaust Aftertreatment
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Solution Overview
Problem
Existing devices with electrical heating catalysts and metallic honeycomb bodies face complications due to their electrical conductivity, requiring additional insulation to prevent short circuits, which complicates the structure and increases time and effort in assembly.
Innovation Solution
A device featuring a metallic heating disk with a ceramic main catalytic converter, where the heating disk is electrically contacted through a feedthrough and inserted into a ceramic half-shell, and supported by ceramic or metal pins, eliminating the need for additional electrical insulation between the metallic heating disk and the ceramic catalytic converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a metallic heating catalyst and supporting catalyst are both electrically conductive, then heating efficiency is improved, but additional electrical insulation is required to prevent short circuits, which complicates the structure and increases assembly effort
Solution Approach 1:
The invention extracts the electrical conductivity function from the supporting catalyst by using a ceramic material that is electrically insulating, while maintaining the mechanical support function. This separates the electrical insulation requirement from the structural support function, eliminating the need for additional insulation layers and simplifying the overall device structure.
Solution Approach 2:
The ceramic supporting catalyst serves multiple functions simultaneously: it provides mechanical support for the heating catalyst, acts as an electrical insulator to prevent short circuits, and maintains the structural integrity of the honeycomb body. This multi-functionality eliminates the need for separate insulation components.
2Reliability
If additional electrical insulation is added between metallic heating catalyst and supporting catalyst, then short circuit prevention is improved, but assembly time and effort increase
Solution Approach 1:
The invention merges the electrical insulation function with the structural support function by using a ceramic supporting catalyst that inherently provides both mechanical support and electrical insulation. This integration eliminates the need for separate insulation components and reduces assembly steps, thereby reducing assembly time and effort.
3Productivity
If metallic honeycomb bodies are used for both heating catalyst and supporting catalyst, then catalytic performance is improved, but electrical insulation requirements increase device complexity
Solution Approach 1:
The invention uses a composite structure where the heating catalyst remains metallic for high catalytic performance, while the supporting catalyst is made of ceramic material that provides both structural support and electrical insulation. This material combination optimizes both catalytic performance and electrical insulation requirements.
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 configuration simplifies the structure, reduces the risk of short circuits, and allows for efficient heat transfer while maintaining the advantages of metallic heating catalysts, enhancing the overall efficiency and reliability of exhaust gas treatment.
Implementation Method 1
a heating disc arranged in a housing and a main catalyst arranged in the housing downstream of the heating disc in the flow direction
Implementation Method 2
the heating disk is inserted into a ceramic half-shell
Implementation Method 3
the heating disk is electrically contacted by means of an electrical feedthrough which is guided through the housing from the outside to the inside
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to a device for treating exhaust gases of an internal combustion engine, with a heating plate (2) arranged in a housing (1) and with a main catalyst (3, 13) arranged in the housing (1), downstream of the heating plate (2) in the flow direction, the flow being able to pass through the heating plate (2) and the main catalyst (3, 13) in the flow direction along a plurality of flow channels, the heating plate (2) being formed by a metal honeycomb body and the main catalyst (3, 13) being formed from a ceramic honeycomb body, which is fixed relative to the housing (1) by a fixing means (6), the heating plate (2) being electrically contacted by way of an electrical feedthrough (4), which is guided through the housing (1) from the outside in.