Honeycomb Structure Arc Corners Balance Strength Pressure Loss
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Solution Overview
Problem
Conventional honeycomb structures used for exhaust gas purification face a trade-off between achieving high isostatic strength and reducing pressure loss, with techniques to improve one often compromising the other, especially when the outer diameter is large.
Innovation Solution
A honeycomb structure with a pillar-shaped body and a porous partition wall having a thickness of 0.0500 to 0.1400 mm, a radius of curvature of 0.0700 to 0.1500 mm, and a porosity of 20 to 40%, where the cell shape is a polygonal or quadrangular shape with an arc corner, optimizing the relationship between R1×T1 to balance isostatic strength and pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the partition wall thickness is reduced to lower pressure loss, then pressure loss decreases, but the isostatic strength deteriorates and cell twisting occurs
Solution Approach 1:
The patent optimizes the partition wall thickness within a specific range (0.03mm to 0.15mm) and controls the cell corner radius (0.05mm to 0.20mm) to achieve the optimal balance between pressure loss and isostatic strength. By precisely controlling these parameters, the invention resolves the contradiction between reducing pressure loss and maintaining structural strength.
2Loss of energy
If the partition wall is thinned to reduce pressure loss, then pressure loss reduces, but manufacturing precision deteriorates due to cell twisting
Solution Approach 1:
The patent specifies optimal parameter ranges including partition wall thickness (0.03mm to 0.15mm) and cell corner radius (0.05mm to 0.20mm) that prevent cell twisting during manufacturing while maintaining low pressure loss. These controlled parameters ensure high manufacturing precision even with thin partition walls.
3Loss of energy
If the outer diameter is increased to reduce pressure loss, then pressure loss reduces, but isostatic strength deteriorates
Solution Approach 1:
The patent controls the outer diameter within a specific range (190.5mm to 355.6mm) and combines it with optimized partition wall thickness (0.0500mm to 0.1400mm) and corner radius (0.0700mm to 0.1500mm) to maintain high isostatic strength while achieving low pressure loss in large-diameter honeycomb structures.
4Strength
If a polygonal shape with arc corner is used to improve isostatic strength, then isostatic strength improves, but pressure loss increases
Solution Approach 1:
The patent optimizes the arc corner radius (0.05mm to 0.20mm, preferably 0.0700mm to 0.1500mm) to achieve the optimal balance where the polygonal shape with arc corners provides sufficient isostatic strength while minimizing pressure loss. The precise control of corner radius prevents excessive pressure loss despite the structural reinforcement.
Data Source
AI summary
A honeycomb structure includes a pillar-shaped honeycomb structure body having a porous partition wall and a circumferential wall, wherein in a section orthogonal to the extending direction of the cells of the honeycomb structure body, the shape of the cell is a polygonal shape with a corner having an arc shape, a thickness T1[mm] of the partition wall is 0.0500 to 0.1400 mm, a radius of curvature R1[mm] of the corner having the arc shape of the cell and the thickness T1[mm] of the partition wall satisfy the relationship of Equation (1), in the section orthogonal to the extending direction of the cells of the honeycomb structure body, the outer diameter of the honeycomb structure body is 190.5 to 355.6 mm, and a porosity of the partition wall is 20 to 40%.0.0050≤R1×T1≤0.0150 Equation (1):