Outer Beaded Body Air Gap for Aftertreatment Mounting
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Solution Overview
Problem
Existing aftertreatment systems for internal combustion engines, such as diesel engines, face challenges in reducing NOx emissions efficiently due to complex designs and heat transfer issues, which complicate manufacturing and installation processes.
Innovation Solution
A single module aftertreatment system is designed with an outer beaded body that includes a mounting zone with inner diameter portions forming an air gap with the inner body, reducing heat transfer and simplifying the mounting process by eliminating unnecessary welds and providing structural support without adding complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the outer body is directly welded to the inner body at the mounting zone, then structural strength is improved, but heat transfer from the inner body to the mounting zone increases
Solution Approach 1:
The outer body is segmented into distinct zones: a mounting zone for structural support and inner diameter portions that contact the inner body. This segmentation allows the mounting zone to remain thermally isolated while maintaining structural integrity through the outer body's own strength
Solution Approach 2:
The outer body acts as an intermediary element between the mounting structure and the inner body. It transfers structural loads without providing a direct thermal conduction path, as the mounting zone is positioned away from the inner body to create thermal isolation
2Strength
If multiple weld joints are used to attach the outer body to the inner body, then structural integrity is improved, but manufacturing complexity increases
Solution Approach 1:
The attachment structure is segmented into discrete inner diameter portions at different locations along the outer body. Each portion can be independently welded to the inner body, simplifying the welding process while maintaining overall structural integrity through distributed attachment points
Solution Approach 2:
Welding is applied locally only at the inner diameter portions where the outer body contacts the inner body, rather than across the entire mounting zone. This localized welding approach reduces manufacturing complexity while providing sufficient structural integrity at the attachment points
3Strength
If the mounting zone is positioned close to the inner body, then structural support is improved, but heat transfer increases
Solution Approach 1:
The outer body serves as a thermal intermediary that provides structural support at the mounting zone while preventing direct thermal contact with the inner body. The mounting zone is positioned on the outer body rather than directly on the inner body, creating thermal isolation while maintaining structural functionality
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
The design reduces heat transfer, simplifies manufacturing, and enhances structural integrity by directly transferring forces without additional stress, while minimizing interference and allowing for clear welding areas, thus improving the efficiency and ease of installation of aftertreatment systems.
Implementation Method 1
The inner body, the mounting zone, the first inner diameter portion, and the second inner diameter portion define a gap between the outer body and the inner body that reduces heat transfer from the inner body to the mounting zone
Data Source
AI summary
Implementations described herein relate to features for a single module aftertreatment system. The single aftertreatment system includes a casing, a catalyst within the casing, and an outer body attached to a portion of the casing with a flat mounting zone on the outer body. The outer body includes a mounting bracket welded to the flat mounting zone. The flat mounting zone is separated from the casing so as to form an air gap between the flat mounting zone of the outer body and the casing. The outer body includes a beaded portion adjacent the flat mounting zone. The outer body includes an inner diameter portion, and the outer body is attached to a portion of the casing by a weld joint between the inner diameter portion and the portion of the casing.