Nested Sealing Rings for Exhaust Gas Treatment Leakage
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Solution Overview
Problem
Existing exhaust gas treatment arrangements for combustion engines face challenges in preventing leakage flows, which can compromise the effectiveness of exhaust gas treatment and lead to inefficiencies and potential emissions.
Innovation Solution
The solution involves an exhaust gas treatment arrangement with a housing that includes at least one exhaust gas treatment unit with a coat, and a sealing unit comprising multiple radially consecutive sealing rings that are interrupted in their extent. These rings are designed to transfer their circumferential interruption ranges to each other, ensuring a tight seal and preventing leakage flows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous bearing/sealing rings are used to prevent leakage flows, then sealing effectiveness is improved, but adaptability to dimensional tolerances and thermal changes deteriorates
Solution Approach 1:
The bearing/sealing rings are segmented into multiple sections around the circumference, creating interruption regions. These segmented rings can adapt to dimensional tolerances and thermal changes while the nested arrangement of multiple rings maintains sealing effectiveness by providing redundant sealing paths.
Solution Approach 2:
The bearing/sealing rings are designed with elastic properties, allowing them to dynamically adapt their shape and position in response to thermal expansion, contraction, and dimensional variations. This dynamic adaptability maintains sealing contact without requiring perfect dimensional precision.
2Reliability
If multiple bearing/sealing rings are arranged radially nested to improve sealing, then sealing effectiveness is improved, but device complexity increases
Solution Approach 1:
Multiple bearing/sealing rings are arranged in a radially nested configuration, with each ring positioned within the radial space of the adjacent ring. This nesting approach maximizes sealing redundancy within a compact radial envelope, improving sealing effectiveness without proportionally increasing the overall device footprint or complexity.
3Adaptability or versatility
If circumferential interruption regions are introduced to improve adaptability, then adaptability is improved, but leakage risk increases
Solution Approach 1:
The bearing/sealing rings are divided into segments with circumferential interruption regions, enabling each segment to independently adapt to local dimensional variations and thermal changes. The interruptions allow for thermal expansion and contraction without compromising the overall sealing integrity.
Solution Approach 2:
The design anticipates thermal expansion and dimensional changes by incorporating circumferential interruption regions that provide clearance and adjustment space. This beforehand cushioning prevents binding and maintains sealing contact under varying operating conditions, preventing leakage despite the interruptions.
Data Source
Figure 1~2
Figure 3~5
Figure 6~7(d)
AI summary
An exhaust gas treatment arrangement for an exhaust system of an internal combustion engine comprises a housing (14) elongated in the direction of a housing longitudinal axis (L) and at least one exhaust gas treatment unit (20, 22) arranged in the housing (14) with a jacket (24), wherein at least one bearing/sealing unit (34) with at least two radially successive, nested bearing/sealing rings (42, 44) each interrupted in a circumferential interruption region (46, 48) is arranged in a radial space (36) formed between the jacket (24) and the housing (14), wherein a circumferential interruption region (46) of at least one of the bearing/sealing rings (42, 44) is offset in the circumferential direction with respect to a circumferential interruption region (48) of another of the bearing/sealing rings (42, 44).