Exhaust Manifold-Catalyst Coupling for Gas Diffusion and Water Drainage
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Solution Overview
Problem
Existing exhaust purification apparatuses face issues with inadequate diffusion of exhaust gas into the catalytic converter and potential accumulation of condensed water due to the design of the connection between the exhaust manifold and the catalytic converter.
Innovation Solution
The apparatus features a tubular diffusion portion with a specific alignment of central axes and varying cross-sectional areas, along with a coupling portion that promotes uniform gas distribution and prevents water accumulation by ensuring exhaust gas collides with strategically designed surfaces before entering the catalytic converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the connection portion is positioned below the exhaust manifold to facilitate water drainage, then condensed water accumulation is reduced, but exhaust gas diffusion into the catalytic converter becomes insufficient
Solution Approach 1:
The patent introduces a diffusion portion with a specific geometric configuration that adds a dimensional aspect to the connection portion. The diffusion portion has a cross-sectional area that increases from the exhaust manifold side toward the catalytic converter side, creating a diffusion effect that improves exhaust gas distribution while maintaining the lowered position for water drainage.
Solution Approach 2:
The patent changes the geometric parameters of the connection portion by implementing a diffusion portion with varying cross-sectional area. The cross-sectional area increases along the flow direction, which transforms the exhaust gas flow characteristics and improves diffusion efficiency without requiring the connection portion to be positioned higher.
2Productivity
If the connection portion is positioned above the lowest point to improve exhaust gas flow, then diffusion efficiency increases, but condensed water accumulates in the connection portion
Solution Approach 1:
The diffusion portion introduces a geometric dimension that allows the connection to be positioned lower while maintaining diffusion efficiency. The tapered geometry creates a flow diffusion effect that compensates for the lower position, enabling both water drainage and adequate exhaust gas diffusion.
3Device complexity
If a simple cylindrical connection is used, then device complexity is reduced, but exhaust gas distribution uniformity deteriorates
Solution Approach 1:
The patent applies local quality by creating a non-uniform cross-sectional area distribution in the diffusion portion. The cross-sectional area varies along the flow direction, with smaller area near the exhaust manifold and larger area near the catalytic converter. This local geometric variation improves exhaust gas distribution uniformity without requiring complex internal structures or multiple 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
This design enhances the diffusion of exhaust gas into the catalytic converter, ensuring uniform distribution and reduces the likelihood of water accumulation, thereby improving the efficiency and functionality of the exhaust purification process.
Implementation Method 1
a tubular diffusion portion (31) to which the exhaust manifold (21) is connected... exhaust gas that has flowed from the exhaust manifold (21) into the diffusion portion (31) collides with the collision surface (32b)... the cross-sectional area of a passage of the coupling portion (41) increases from a connection point with the diffusion portion (31) toward a connection point with the catalytic converter (25)
Implementation Method 2
a collision surface (32b) arranged such that a central axis (31z) of the diffusion portion (31) is positioned between the collision surface (32b) and the connection surface (32a)... Exhaust gas that has flowed from the exhaust manifold (21) into the diffusion portion (31) collides with the collision surface (32b)
Data Source
AI summary
An exhaust purification apparatus includes a connection portion that connects an exhaust manifold to a catalytic converter. The connection portion includes a diffusion portion and a coupling portion. The coupling portion is configured such that a cross-sectional area of a passage of the coupling portion increases from a connection point with the diffusion portion toward a connection point with the catalytic converter. The side surface of the diffusion portion includes a connection surface to which the exhaust manifold is connected, a collision surface with which the exhaust gas that has flowed into the diffusion portion from the exhaust manifold strikes, a first coupling surface, and a second coupling surface. Cross-sectional shapes of the first coupling surface, the second coupling surface, and the collision surface are arcuate. The cross-sectional shape of the collision surface has a smaller curvature than the cross-sectional shapes of the first and second coupling surfaces.