Exhaust Emission Control Device Heat Retention Chamber
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Solution Overview
Problem
The existing exhaust emission control devices require a heat-insulating structure using costly materials like glass wool to prevent urea water from depositing as solid urea when colliding with a cold inner periphery, which increases production costs.
Innovation Solution
An exhaust emission control device design featuring a gas gathering chamber and mixing pipe with a heat-retention chamber surrounding the entry end of the mixing pipe, where the exhaust gas is tangentially introduced to create a swirling flow, ensuring the urea water is effectively decomposed into ammonia and carbon dioxide without the need for external heat-insulating materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heat-insulating structure using glass wool is added to prevent urea water deposition, then urea water decomposition reliability is improved, but device complexity and production cost increase
Solution Approach 1:
The gas gathering chamber itself serves as the heat-retention structure through its enclosed space design, eliminating the need for separate heat-insulating materials. The chamber's structure automatically provides the necessary thermal environment for urea water decomposition, making the system self-sufficient and reducing complexity.
Solution Approach 2:
The invention changes the operational parameters by ensuring the gas gathering chamber maintains sufficient temperature through its enclosed design. This temperature parameter control prevents urea water deposition without requiring additional heat-insulating materials, thus improving reliability while avoiding increased device complexity.
2Ease of manufacture
If the gas gathering chamber is designed as an enclosed space to retain heat, then production cost is reduced by eliminating heat-insulating materials, but the chamber volume increases
Solution Approach 1:
The invention merges the gas gathering function and heat retention function into a single enclosed chamber structure. By combining these two functions, the design eliminates the need for separate heat-insulating materials (reducing production cost) while the integrated chamber design optimizes space utilization to minimize volume increase.
Solution Approach 2:
The gas gathering chamber is designed to perform multiple functions simultaneously: gathering exhaust gas, retaining heat for urea water decomposition, and serving as the reaction space. This multi-functionality reduces the need for additional components, lowering production cost while the efficient design minimizes unnecessary volume expansion.
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 facilitates the decomposition of urea water into ammonia and carbon dioxide, eliminating the need for costly heat-insulating materials, reducing production costs while maintaining efficient urea water dispersion and decomposition.
Implementation Method 1
gas gathering chamber for surrounding a discharge end of the particulate filter to gather the exhaust gas from the discharge end through substantial perpendicular turnabout of the gas
Implementation Method 2
Gas guide passages for tangential introduction of all of the exhaust gas from the discharge side of the particulate filter to an opening formed on an entry end of the mixing pipe
Implementation Method 3
urea water is added axially of an entry end of the mixing pipe and is pyrolyzed into ammonia and carbon dioxide gas
Data Source
AI summary
An object of the invention is to provide an exhaust emission control device which eliminates the use of a heat-retention structure using heat-insulating material such as glass wool so as to attain substantial lessening in production cost. A discharge end of a gas gathering chamber is connected to an entry end of a mixing pipe so as to encase the entry end of the mixing pipe and close an opened end face in a required spaced-apart relationship. Moreover, a side surface of the entry end of the mixing pipe adjacent to the discharge side of the particulate filter is formed with an opening; and gas guide passages are formed in the gas gathering chamber by guide fins for tangential introduction of all of the exhaust gas from the discharge side of the particulate filter to the opening. An extra space isolated from the gas guide passages is ensured in the gas gathering chamber as a heat-retention chamber surrounding the entry end of the mixing pipe.