Exhaust Manifold Connection Portion Constriction Design
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Solution Overview
Problem
Existing exhaust purifying apparatuses for internal combustion engines face challenges in effectively diffusing exhaust gases to ensure uniform purification by the catalytic converter, while also preventing the accumulation of condensed water in the swirling flow generator.
Innovation Solution
The apparatus includes a cylindrical connection portion with a constriction at the part connected to the catalytic converter, creating a collision diffusion chamber that diffuses exhaust gases before they reach the catalytic converter. This design promotes uniform diffusion of exhaust gases and prevents condensed water accumulation by not providing the constriction in the vertically lower part of the inner wall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a constriction is provided in the connection portion to promote exhaust gas diffusion, then the diffusion effect is improved, but condensed water may accumulate in the connection portion
Solution Approach 1:
The constriction is strategically positioned only in the upper part of the connection portion's inner wall, while the lower part maintains a smooth wall structure. This local differentiation allows the upper constriction to promote exhaust gas diffusion and the lower smooth section to prevent condensed water accumulation, resolving the contradiction between diffusion effectiveness and water accumulation prevention.
2Speed
If the outflow portion is connected above the lowermost portion of the swirling flow generator, then exhaust gas flow is guided to the catalytic converter, but condensed water accumulates in the swirling flow generator
Solution Approach 1:
The harmful function of the connection portion (condensed water accumulation) is extracted and eliminated by positioning the connection between the exhaust manifold and catalytic converter above the lowermost portion of the connection portion. This extraction removes the water accumulation problem while preserving the exhaust gas flow guidance function.
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 effectively promotes the diffusion of exhaust gases, ensuring uniform distribution and efficient purification by the catalytic converter, while minimizing the risk of condensed water accumulation.
Implementation Method 1
The collision diffusion chamber is configured to cause exhaust gas flowing from the exhaust manifold to collide with an inner wall of the collision diffusion chamber, diffuse the exhaust gas, and guide the diffused exhaust gas to the catalytic converter
Data Source
AI summary
An exhaust purifying apparatus includes an exhaust manifold, a cylindrical catalytic converter, and a cylindrical connection portion that connects the catalytic converter to the exhaust manifold. The exhaust manifold is connected to a side surface of the connection portion. The connection portion is connected to the catalytic converter so as to have the same central axis as the catalytic converter. The connection portion includes a constriction at a part connected to the catalytic converter. A part of the connection portion on an upstream side of the constriction defines a collision diffusion chamber. The cross-sectional flow area of the connection portion orthogonal to the central axis is smaller at the constriction than in the collision diffusion chamber. The constriction is not provided in a vertically lower part of the inner wall of the connection portion in a mounted state of the internal combustion engine.