Exhaust Gas Mixer Half-Shells Vortex Flow
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Solution Overview
Problem
Existing exhaust gas mixing systems face challenges in optimizing material usage while ensuring a stable and efficient connection to exhaust pipes, which affects the overall performance and efficiency of the mixing process.
Innovation Solution
A mixer design utilizing two half-shells with a coaxial pipe end and circumferential pipe profile for connection to an exhaust pipe, featuring radially extending indentations and projections to enhance flow and stability, allowing for direct welding and forming a vortex flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If two half-shells are used to form the mixing pipe, then material usage is reduced, but connection stability to exhaust pipes may be compromised
Solution Approach 1:
The mixing pipe is divided into two half-shells that can be separately manufactured and then assembled together. This segmentation allows for reduced material usage while maintaining structural integrity through proper joining at the seam, resolving the contradiction between material efficiency and connection stability.
Solution Approach 2:
The two half-shells are joined together to form a complete mixing pipe structure. By merging the two separate components with proper sealing and joining methods, the design achieves both material efficiency (using only half-shells) and connection stability (through integrated assembly).
2Productivity
If a coaxial pipe end with circumferential pipe profile is provided for direct welding connection, then connection efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The pipe end is designed with a universal circumferential profile that serves multiple functions: it provides a standardized welding surface for connection to exhaust pipes, maintains coaxial alignment, and ensures proper structural integration. This multi-functionality improves connection efficiency while the standardized design actually reduces manufacturing complexity.
3Productivity
If radially extending indentations and projections are added to shell edges, then vortex flow and mixing efficiency are enhanced, but device complexity increases
Solution Approach 1:
Instead of making the entire shell structure complex, the invention applies local modifications (radially extending indentations and projections) only at specific locations on the shell edges. These localized features are sufficient to generate vortex flow and enhance mixing efficiency without requiring complex structures throughout the entire device.
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 ensures a stable and efficient connection to exhaust pipes, reducing material usage and improving the mixing process by creating a vortex flow, thus enhancing the mixing efficiency and stability of the exhaust gas system.
Implementation Method 1
The projection likewise diminishes from the guiding radius Ra thereof to the nominal radius Rn in an angular range between 20° and 60°. This facilitates the formation of a vortex flow inside the mixer.
Data Source
AI summary
The invention relates to a mixer for an exhaust gas system for mixing an additive into an exhaust gas flow of an internal combustion engine, having a first shell and at least a second shell which are arranged successively in the circumferential direction in relation to a center axis, each shell having at least two shell edges that are arranged offset in the circumferential direction and which each form a flow edge, wherein the flow edges of two circumferentially adjacent shell edges of two different shells delimit an inflow opening, such that at least one pipe end arranged coaxially with the center axis is provided with a circumferential pipe profile that has a nominal radius Rn and is used for connection to an exhaust pipe, the pipe end being formed by the circumferentially adjacent shells.