Modular Mixer Inlet With Helical Port For Exhaust Gas Swirling
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Solution Overview
Problem
The existing exhaust system configurations face challenges in accommodating various mounting orientations of diesel particulate filter (DPF) and selective catalytic reduction (SCR) catalyst modules, leading to increased manufacturing costs and inefficiencies in mixing exhaust gases and reducing agents due to packaging constraints.
Innovation Solution
A modular mixer assembly with a helically formed inlet port that initiates a swirling motion in exhaust gases, allowing for flexible module orientations and effective mixing, coupled with a doser system that injects reducing agents downstream of the mixer inlet, forming a compact design that reduces part proliferation and enhances mixing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the mixer inlet and SCR catalyst are assembled as a first module and the DPF is assembled as a second module to accommodate various mounting orientations, then the adaptability to different vehicle packaging constraints is improved, but the device complexity increases due to the need for re-configuring inlet and outlet positions
Solution Approach 1:
The mixer inlet body is designed with a universal structure that can accommodate multiple mounting orientations without requiring re-configuration of inlet and outlet positions. The helically formed portion and tangentially orientated inlet port work together with the modular assembly design to provide a single configuration that functions across different orientations, eliminating the need for multiple specialized inlet/outlet arrangements.
2Productivity
If the inlet port is configured to direct exhaust gases effectively into the mixer in various mounting configurations, then the mixing efficiency is improved, but the manufacturing cost increases due to part proliferation
Solution Approach 1:
The mixer inlet body incorporates a universal design where the helically formed portion and tangentially orientated inlet port maintain effective exhaust gas direction across all mounting orientations. This single multi-functional configuration eliminates the need for multiple specialized inlet port designs, thereby reducing part proliferation and manufacturing costs while preserving mixing efficiency.
Solution Approach 2:
The helically formed portion uses curved geometry to effectively direct exhaust gases into the mixer regardless of mounting orientation. The spiral/helical shape naturally guides the flow in a manner that maintains mixing efficiency across different orientations without requiring additional specialized components for each orientation.
3Volume of moving object
If a compact mixer design is implemented to reduce packaging space, then the vehicle packaging constraints are improved, but the mixing effectiveness may be compromised
Solution Approach 1:
The helically formed portion utilizes curved geometry to maximize mixing effectiveness within a compact volume. The spiral path created by the helical structure ensures thorough mixing of exhaust gases and reducing agents while maintaining a compact mixer design that fits within vehicle packaging constraints.
Solution Approach 2:
The tangentially orientated inlet port creates a swirling flow pattern that enhances mixing effectiveness through fluid dynamic effects. This pneumatic approach uses the kinetic energy of the incoming exhaust gases to achieve thorough mixing within the compact mixer volume, eliminating the need for larger mechanical mixing components.
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 modular mixer assembly enables efficient mixing of exhaust gases and reducing agents across different mounting orientations, reducing manufacturing costs and improving emissions control by ensuring thorough mixing and reduced back pressure, thereby enhancing the overall exhaust system performance.
Implementation Method 1
The enclosed end includes a helically formed portion that initiates a swirling motion to the exhaust gases exiting the inlet port
Implementation Method 2
the mixer is configured to mix exhaust gases and products of urea transformation
Data Source
AI summary
A mixer assembly for a vehicle exhaust system includes a mixer having an upstream end and a downstream end. The mixer defines an internal cavity within which exhaust gases are mixed. A mixer inlet body has an enclosed end and an open end that attaches to the upstream end of the mixer. The mixer inlet body includes an outer peripheral surface extending from the enclosed end to the open end to surround a center axis. The outer peripheral surface includes an inlet port and the enclosed end includes a helically formed portion that initiates a swirling motion to the exhaust gases exiting the inlet port.