Honeycomb Filter Porous Plugging Portions Stress Management
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Solution Overview
Problem
Conventional honeycomb filters face challenges in achieving satisfactory exhaust gas purification performance when loaded with a catalyst, and plugging portions tend to fall off or become damaged due to stress, especially during the canning process.
Innovation Solution
A honeycomb filter with a pillar-shaped structure and porous plugging portions having voids, where the porosity of the plugging portions ranges from 68% to 83%, and the voids are strategically located in the circumferential region to reduce stress concentration and enhance erosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the honeycomb filter is loaded with an exhaust gas purifying catalyst, then exhaust gas purification performance is improved, but the plugging portions easily fall off from the ends of cells due to stress
Solution Approach 1:
The plugging portions are designed with a porous structure having a porosity of 68% to 83%, which reduces their density and makes them more compliant. This porous structure allows the plugging portions to deform elastically under stress during canning, preventing them from falling off while maintaining their function of sealing cell openings for exhaust gas purification
Solution Approach 2:
The invention specifies a particular porosity range (68% to 83%) for the plugging portions to optimize their mechanical properties. By controlling the porosity parameter, the plugging portions achieve an optimal balance between being lightweight enough to reduce stress concentration and sufficiently strong to remain attached during the canning process
2Device complexity
If the holding material is positioned at the boundary between plugging portions and void portions, then the honeycomb filter is compact, but the plugging portions are damaged due to high stress applied to the vicinity of the boundary
Solution Approach 1:
The porous structure of the plugging portions with 68% to 83% porosity provides elastic compliance that allows them to absorb and distribute the stress applied by the holding material during canning. This prevents stress concentration at the boundary between plugging portions and void portions, avoiding damage while maintaining compact canning 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
The filter improves exhaust gas purification performance, prevents plugging portions from falling off, and enhances temperature rising performance by minimizing stress concentration and maintaining structural integrity during canning.
Implementation Method 1
In the plugging portions having the voids, porosity including the voids as pores ranges from 68% to 83%
Implementation Method 2
the porous partition walls of the honeycomb structure function as filters that trap the particulate matter in an exhaust gas
Data Source
AI summary
A honeycomb filter includes a pillar-shaped honeycomb structure having porous partition walls placed, surrounding a plurality of cells which serve as fluid through channels extending from an inflow end face to an outflow end face; and porous plugging portions provided either at the ends on the inflow end face side of the cells or at the ends on the outflow end face side of the cells, wherein the plugging portions include plugging portions that have voids therein, and in the plugging portions having the voids, porosity including the voids as pores ranges from 68% to 83%.