Exhaust Device Catalyst Backflow Expansion Space
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Solution Overview
Problem
Existing exhaust devices face a challenge in achieving improved purification performance without significantly increasing the quantity of catalysts, which would lead to higher costs.
Innovation Solution
The exhaust device incorporates a casing component with an expansion space, a communication pipe, a first catalyst located upstream of the expansion space, and a second catalyst positioned within the communication pipe opposing the expansion space. This configuration allows exhaust gas to expand, diffuse, and create backflows, increasing the contact frequency with the second catalyst.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the quantity of catalyst carried is increased to improve purification performance, then purification performance is improved, but cost increases
Solution Approach 1:
The patent utilizes periodic exhaust gas pulsation to create backflow that repeatedly passes exhaust gas through the communication pipe containing the second catalyst. This periodic action increases the contact frequency between exhaust gas and catalyst, improving purification performance without requiring additional catalyst quantity
Solution Approach 2:
The expansion space maintains continuous circulation of exhaust gas through the communication pipe, ensuring that exhaust gas repeatedly contacts the second catalyst. This continuous useful action maximizes the utilization of the limited catalyst quantity by ensuring constant exposure to purifying surfaces
2Reliability
If the quantity of catalyst carried is increased to improve purification performance, then purification performance is improved, but device complexity increases
Solution Approach 1:
The communication pipe serves multiple functions: it acts as a flow passage for exhaust gas, contains the second catalyst for purification, and utilizes the expansion space to generate backflow. This multi-functionality improves purification performance without adding separate dedicated components, thereby avoiding increased device complexity
Solution Approach 2:
The system utilizes the natural pulsation of exhaust gas from the engine to create backflow that drives exhaust gas through the communication pipe. This self-service mechanism eliminates the need for additional pumps or actuators, improving purification performance while maintaining simple device structure
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 purification performance by increasing the number of contacts between the exhaust gas and the second catalyst, thereby achieving effective gas purification with a lower quantity of catalysts, which helps in reducing costs.
Implementation Method 1
an expansion space in which the exhaust gas is allowed to expand
Implementation Method 2
the exhaust gas which has diffused into the expansion space
Implementation Method 3
as a function of exhaust gas pulsation
Implementation Method 4
the exhaust gas which has diffused into the expansion space can produce a backflow which is directed into the second catalyst
Implementation Method 5
a first catalyst located in the exhaust gas passage upstream of the expansion space; and a second catalyst located in the communication pipe in opposition to the expansion space
Data Source
AI summary
An exhaust device includes: an exhaust chamber defining within an exhaust gas passage an expansion space in which exhaust gas is allowed to expand; a chamber inlet pipe coupled to the exhaust chamber and having a downstream end that is open to the expansion space; a first catalyst located in the exhaust gas passage upstream of the expansion space; and a second catalyst located in the chamber inlet pipe in opposition to the expansion space.