Integral Connection Unit with Flanges for High-Temperature Exhaust Heating
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Solution Overview
Problem
Existing connection units for heating gas generating arrangements in exhaust systems of internal combustion engines are prone to mechanical and thermal instability, particularly when connecting to exhaust gas conducting components, leading to potential damage and inefficient heat distribution.
Innovation Solution
A connection unit with an integrally formed metal cast body, featuring a circumferential wall, fastening flange, and connection flange, allowing for stable attachment to the exhaust gas conducting component and connection to the heating gas generating arrangement using a V-band clamp, ensuring uniform load distribution and reduced thermal exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a connection unit is used to connect a heating gas generating arrangement to an exhaust gas conducting component, then the heating gas can be introduced into the exhaust system, but the connection unit is prone to mechanical and thermal instability under strong loading conditions
Solution Approach 1:
The connection unit body is formed as a single integral component rather than an assembly of separate parts. This merging of components eliminates weak points at joints and welds, providing uniform structural properties throughout the connection unit that can withstand the strong mechanical and thermal loads in the exhaust system environment.
Solution Approach 2:
The connection unit is made from a material that combines high mechanical strength with thermal stability and resistance to thermal expansion. This composite material properties approach allows the single-piece connection unit to maintain its structural integrity under the combined mechanical and thermal loading conditions without deforming or failing.
2Productivity
If heating gas at temperatures significantly more than 1000° C. is generated, then rapid heating of exhaust gas treatment units can be achieved, but the connection unit experiences excessive thermal exposure and potential damage
Solution Approach 1:
The integral connection unit body provides uniform material properties and structural density throughout, creating consistent thermal resistance across the entire component. This local quality uniformity prevents weak points where thermal damage could concentrate, allowing the connection unit to withstand the extreme temperatures of heating gas while still enabling rapid heat transfer to the exhaust gas treatment units.
3Ease of manufacture
If separate components are used to form the connection unit body, then manufacturing and assembly may be simplified, but the connection regions become weak points prone to damage under loading
Solution Approach 1:
By forming the entire connection unit body as a single integral component, the design eliminates the connection regions between separate parts that would be prone to damage. The merging of what would otherwise be separate manufacturing steps into a single casting or forming process creates a structure with uniform strength throughout, removing the weak points at joints while still allowing for practical manufacturing through techniques like die casting or forging.
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 solution provides a stable and cost-effective connection that withstands high mechanical and thermal loads, facilitating efficient heat transfer and uniform mixing of heating gas with exhaust gas, while minimizing damage and overheating risks.
Implementation Method 1
the latter may be configured as a heating gas generating arrangement which, in an exothermic reaction, generally in other words in a combustion process or oxidation process, generates an exhaust gas used as a heating gas
Implementation Method 2
use the heat transported in the heating gas for heating such exhaust gas treatment units
Data Source
AI summary
A connection unit connects a heating gas generating arrangement to an exhaust gas conducting component of an exhaust system for an internal combustion engine. The heating gas generated is introduceable into an exhaust duct in the exhaust gas conducting component. The connection unit includes: a connection unit body defining a center axis and being formed integrally with: a circumferential wall surrounding a heating duct; a fastening region for fastening to a component wall of the exhaust gas conducting component; and, a connection region for connecting the heating gas generating arrangement to the connection unit. The fastening region includes a flange protruding radially outward from the wall with respect to the center axis and having a fastening surface formed on the flange. The connection region includes a connection flange protruding radially outward from the wall with respect to the center axis and having a connection surface formed on the connection flange.