Flexible Edge Protectant Mounting Mat for Exhaust Gas Erosion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing mounting mats for exhaust gas treatment devices, such as catalytic converters and diesel particulate traps, face issues with edge erosion due to hot exhaust gases, and current solutions like high-temperature resistant cloths and rigidizing solutions are complex and inefficient, often leading to premature degradation and insufficient protection.
Innovation Solution
A mounting mat with inorganic fibers treated with a flexible edge protectant comprising a polymer and a gas erosion resisting agent, which is applied to the edges to prevent erosion without losing flexibility, eliminating the need for separate edge protectants and simplifying the installation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional mounting mats are used without edge protection, then the device structure is simple and installation is easy, but the mounting mat edges suffer from erosion due to hot exhaust gases leading to premature degradation
Solution Approach 1:
The patent combines the edge protection function with the mounting mat itself by incorporating a flexible edge protectant material directly into the mounting mat structure. This integration eliminates the need for separate edge protection components while providing effective protection against hot gas erosion, thus improving reliability without significantly increasing device complexity
Solution Approach 2:
The mounting mat is constructed as a composite material system combining an intumescent core layer with a flexible edge protectant layer. The edge protectant material possesses specific properties (flexibility, heat resistance, erosion resistance) that complement the intumescent material, creating a composite structure that simultaneously provides protection and maintains structural integrity under thermal stress
2Object-affected harmful factors
If rigidizing solutions or separate edge protectants are applied to mounting mat edges, then edge erosion resistance is improved, but the mounting mat loses flexibility and installation becomes more complex
Solution Approach 1:
The patent applies the flexible edge protectant material specifically to the edge regions of the mounting mat where erosion occurs, while the central portion maintains its intumescent properties. This localized application provides erosion resistance exactly where needed without compromising the overall flexibility and installation characteristics of the mounting mat
Solution Approach 2:
The edge protectant material is designed with specific physical-chemical parameters that differ from the intumescent core: it maintains flexibility at operating temperatures, resists hot gas erosion, and adheres to the mounting mat. These parameter changes enable the edge regions to withstand erosive conditions while preserving the mounting mat's ability to be installed and conform to the catalyst support
3Object-affected harmful factors
If high-temperature resistant cloths or rigidizing solutions are used for edge protection, then edge erosion resistance is improved, but the installation process becomes more complex and time-consuming
Solution Approach 1:
The flexible edge protectant material is pre-integrated into the mounting mat during manufacturing, forming a unified component. This preliminary action eliminates the need for separate installation steps involving application of rigidizing solutions or attachment of separate protection cloths, thereby reducing installation time and complexity while ensuring consistent edge protection
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 treated mounting mat effectively resists edge erosion and maintains flexibility, ensuring prolonged durability and efficient operation within the exhaust gas treatment device, even under high-temperature conditions, without the need for additional protective measures.
Implementation Method 1
a flexible edge protectant comprising a polymer and a gas erosion resisting agent adsorbed on the mounting mat edges
Implementation Method 2
the mounting or support mat material is positioned within the gap between the fragile structure and the housing
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A mounting mat for an exhaust gas treatment device includes first and second major opposite facing surfaces, leading and trailing edges, and opposite lateral edges. At least a portion of one or both of the opposite lateral edges includes an edge protectant that protects the mounting mat against erosion from hot gases encountered during the normal operation of the exhaust gas treatment device. The edge protectant remains flexible after it has been applied to the mounting mat and substantially dried. Also disclosed is an exhaust gas treatment device that includes a housing and a fragile structure mounted within the housing by the mounting mat. Additionally disclosed are methods of making the mounting mat and an exhaust gas treatment device.