Exhaust Aftertreatment Preloading for Honeycomb Sealing
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Solution Overview
Problem
Existing exhaust gas aftertreatment systems for large internal combustion engines face challenges in ensuring complete exhaust gas flow through honeycomb bodies without bypassing through gaps between the honeycomb body carrier and the receiving housing.
Innovation Solution
The implementation of preloading elements acting in the flow direction and perpendicular to it ensures that exhaust gas is guided through the honeycomb bodies, preventing bypasses. These elements are designed as separate prestressing assemblies that can be reused, featuring bellows-like elements for flow direction prestressing and latch-like projections for perpendicular prestressing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the honeycomb body is held by a honeycomb body carrier in the receiving housing, then the exhaust aftertreatment unit is supported and positioned, but exhaust gas flows past the honeycomb body via gaps between the honeycomb body carrier and the receiving housing
Solution Approach 1:
The invention applies preloading elements that act in advance to compress the honeycomb body against the receiving housing wall, preventing gap formation before exhaust gas flow begins. This preliminary compression action ensures complete exhaust gas flow through the honeycomb body without bypassing through gaps.
Solution Approach 2:
The preloading elements are designed as separate, modular components that can be independently positioned and adjusted. This segmentation allows for simplified assembly and manufacturing, as the preloading mechanism can be installed separately from the honeycomb body carrier assembly.
2Reliability
If preloading elements are used to guide exhaust gas through the honeycomb body, then complete exhaust gas flow is ensured, but the device complexity increases
Solution Approach 1:
The invention combines the preloading function with the existing honeycomb body carrier structure. The preloading elements are integrated into the carrier assembly, merging two functions (support/positioning and sealing/compression) into a single integrated component system, thereby reducing overall device complexity.
Solution Approach 2:
The preloading elements serve multiple functions simultaneously: they compress the honeycomb body to eliminate gaps, provide structural support, and maintain positioning within the receiving housing. This multi-functionality reduces the need for separate components for each function.
3Stability of the object's composition
If the honeycomb body carrier is designed to hold the honeycomb body securely, then positioning is improved, but exhaust gas bypasses through gaps between the carrier and receiving housing
Solution Approach 1:
The preloading elements apply compressive force in advance to counteract the tendency of gaps to form between the honeycomb body carrier and receiving housing. This preliminary anti-action prevents the harmful effect of exhaust gas bypass before it can occur during operation.
Solution Approach 2:
The preloading mechanism is activated during assembly to compress the honeycomb body against the receiving housing wall before the system begins operation. This preliminary compression action ensures that no gaps exist for exhaust gas to bypass through during normal operation.
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 effectively ensures complete exhaust gas flow through the honeycomb bodies with minimal effort, maintaining efficient exhaust gas aftertreatment while allowing for easy replacement of exhaust aftertreatment units.
Implementation Method 1
first prestressing elements acting in the flow direction of the respective exhaust gas aftertreatment unit
Implementation Method 2
second prestressing elements acting perpendicular to the flow direction of the respective exhaust gas aftertreatment unit
Data Source
Figure 1~2
Figure 3~5
Figure 6~8
AI summary
Exhaust aftertreatment device (40) of an internal combustion engine, with a receiving housing (41), with at least one exhaust aftertreatment unit (42) arranged in the receiving housing (41), which has a honeycomb body (43) serving as a catalyst and/or as a particulate filter and a honeycomb body carrier (44) surrounding the honeycomb body (43) and leaving the honeycomb body (43) free at its end faces, wherein the at least one exhaust aftertreatment unit (42) is pre-tensioned in the receiving housing (41) by means of first pre-tensioning elements (46) acting in the flow direction of the respective exhaust aftertreatment unit (42) and by means of second pre-tensioning elements (47) acting perpendicular to the flow direction of the respective exhaust aftertreatment unit (42).