Honeycomb Structure Partition Wall Thickness Variation
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Solution Overview
Problem
Honeycomb structures used in exhaust gas purifying devices face challenges in achieving both high temperature raising performance and high heat capacity while maintaining mechanical strength, particularly during the canning process, where they are prone to cracking due to external forces.
Innovation Solution
A honeycomb structure with partition walls of varying thicknesses, including standard, wide, and narrow walls, randomly distributed to achieve a non-standard partition wall ratio of 10-30%, ensuring a balanced temperature raising performance and heat capacity, and enhanced shearing strength by maintaining a certain average partition wall thickness and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the partition wall thickness is decreased to improve temperature raising performance, then the temperature raising performance is improved, but the heat capacity decreases and mechanical strength remarkably decreases
Solution Approach 1:
The partition walls are designed with different thicknesses in different regions: the first partition walls have a first thickness optimized for temperature raising performance, while the second partition walls have a second thickness (greater than the first) optimized for mechanical strength and heat capacity. This local differentiation allows each region to perform its primary function effectively.
Solution Approach 2:
The partition walls are segmented into two distinct types based on thickness: first partition walls with smaller thickness for temperature raising, and second partition walls with larger thickness for mechanical strength. This segmentation enables the structure to simultaneously achieve both temperature raising performance and mechanical durability.
2Temperature
If the partition wall thickness is decreased to improve temperature raising performance, then the temperature raising performance is improved, but the heat capacity decreases
Solution Approach 1:
Different regions of the honeycomb structure have different partition wall thicknesses. The second partition walls with larger thickness are strategically positioned to provide high heat capacity where thermal energy storage is critical, while first partition walls with smaller thickness provide efficient temperature raising in other regions.
Solution Approach 2:
The partition walls are divided into two segments with different thickness characteristics. This segmentation allows the structure to optimize both temperature raising performance (through thinner walls) and heat capacity (through thicker walls in specific regions) simultaneously.
3Strength
If the partition wall thickness is increased to improve mechanical strength, then the mechanical strength is improved, but the temperature raising performance deteriorates
Solution Approach 1:
The honeycomb structure employs local quality differentiation where second partition walls have larger thickness for mechanical strength in regions requiring structural integrity, while first partition walls have smaller thickness for optimized temperature raising performance in regions where thermal efficiency is prioritized.
Solution Approach 2:
The partition walls are segmented into two types with different thicknesses. This segmentation enables the structure to achieve both mechanical strength (through thicker second partition walls) and temperature raising performance (through thinner first partition walls) by assigning different functional priorities to different segments.
4Quantity of substance
If the honeycomb structure is made of material with high heat capacity to maintain temperature, then the heat capacity is improved, but the temperature raising performance from start of engine deteriorates
Solution Approach 1:
The honeycomb structure uses local quality differentiation in partition wall thickness to balance heat capacity and temperature raising performance. Thicker second partition walls provide heat capacity for temperature maintenance, while thinner first partition walls enable rapid temperature raising from engine start, achieving both objectives simultaneously through spatial differentiation.
Solution Approach 2:
The partition walls are segmented into two thickness categories that work together to resolve the contradiction. The segmentation allows the structure to have high heat capacity overall (through the presence of thicker walls) while maintaining rapid temperature raising capability (through the presence of thinner walls in critical regions).
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 structure effectively maintains a temperature above the catalyst activation temperature for efficient purification and prevents cracking during canning by balancing temperature raising and heat capacity with improved mechanical strength.
Implementation Method 1
which is capable of efficiently perform a purifying treatment of the exhaust gas or the like... simultaneously exerts both of a high temperature raising performance and a high heat capacity
Implementation Method 2
cell surfaces of the honeycomb structure are coated with a catalyst to oxidize and purify the particulate matter
Implementation Method 3
cell surfaces of the honeycomb structure are coated with a catalyst to oxidize and purify the particulate matter
Implementation Method 4
it is necessary to immediately raise a temperature of the honeycomb structure up to a temperature to activate the catalyst
Data Source
AI summary
A honeycomb structure has partition walls defining a plurality of hexagonal cells the partition walls are constituted by combining standard partition walls having a partition wall thickness in a range smaller than ±10% to an average partition wall thickness of the partition walls, wide partition walls having a partition wall thickness of +10% or more to the average partition wall thickness, and narrow partition walls having a partition wall thickness of −10% or less to the average partition wall thickness, and a non-standard partition wall ratio is in a range of 10% to 30% which is a ratio occupied by a subtotal number of non-standard partition walls obtained by adding the wide partition walls and the narrow partition walls in a total number of the partition walls which is obtained by adding the numbers of the standard partition walls, the wide partition walls and the narrow partition walls.