Engine Exhaust Purification L-Layout for Compact DPF and SCR Mounting
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Solution Overview
Problem
Existing engine devices with integrated exhaust gas purification systems face issues of upsizing and increased height due to the parallel arrangement of DPF and SCR cases, leading to space constraints and inefficiencies in exhaust gas purification.
Innovation Solution
The engine device incorporates an L-shaped arrangement of a first case for carbon compound removal and a second case for nitrogen compound removal, with a turbocharger interposed between the first case and the exhaust manifold, and a urea mixing tube connecting the cases, allowing for compact integration and efficient urea-water mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a DPF case and an SCR case are disposed in parallel as an exhaust gas purification device, then exhaust gas purification function is improved, but the area required for mounting increases and the engine device becomes upsized
Solution Approach 1:
The patent places the SCR case inside the DPF case, creating a nested configuration where the SCR case is positioned within the internal space of the DPF case. This allows both purification functions to be integrated in a compact arrangement, reducing the overall mounting area while maintaining both exhaust gas purification capabilities
Solution Approach 2:
The patent combines the DPF case and SCR case into a single integrated exhaust gas purification device structure, where the two cases work together in series rather than parallel. The exhaust gas passes through the DPF first, then through the SCR case, merging the two purification functions into one compact unit that reduces the required mounting area
2Reliability
If an exhaust gas purification device is mounted above the engine device, then exhaust gas purification is achieved, but the height of the engine device increases
Solution Approach 1:
By nesting the SCR case within the DPF case, the patent creates a compact vertical arrangement that minimizes the overall height of the exhaust gas purification device when mounted above the engine, reducing the height increase compared to separate parallel cases
3Reliability
If a connecting pipe with adequate length is used to mix urea water and exhaust gas, then mixing effect is improved, but the exhaust gas purification device becomes upsized
Solution Approach 1:
The patent introduces a rotary mixing mechanism that adds rotational motion in a different dimension to enhance mixing. Instead of relying solely on pipe length, the rotary mixer actively stirs the urea water and exhaust gas mixture, achieving effective mixing in a more compact volume by utilizing rotational movement rather than extended linear flow path
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
This configuration reduces the overall size of the engine device, enhances purification efficiency by uniform mixing of urea and exhaust gas, and prevents crystallization of urea components, thereby maintaining low exhaust resistance and facilitating compact mounting in limited spaces.
Implementation Method 1
urea water and an exhaust gas are mixed together
Implementation Method 2
a plurality of through-holes is provided, and a urea water injection nozzle is disposed at an end of the connecting pipe
Implementation Method 3
a first exhaust gas purification body for removing a carbon compound
Implementation Method 4
a first exhaust gas purification body for removing a carbon compound
Implementation Method 5
a second exhaust gas purification body for removing a nitrogen compound
Implementation Method 6
a urea selective reduction catalyst
Data Source
AI summary
An exhaust gas purification device including: a first case communicating with an exhaust manifold of an engine and internally including a first exhaust gas purification body for removing a carbon compound; and a second case communicating with an exhaust outlet of the first case and internally including second exhaust gas purification bodies for removing a nitrogen compound. The first case and the second case are arranged above the engine and in an L-shape to respectively extend along two side surfaces of the engine, the two side surfaces being adjacent to each other.