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Hexagonal-cell honeycomb structure

A technology of hexagonal grid and honeycomb structure, which is applied in applications, household utensils, ceramic products, etc., can solve the problem that the mechanical strength of the hexagonal grid structure will not be fully improved, and the hexagonal grid structure cannot be guaranteed Strength and other issues

Active Publication Date: 2007-07-04
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Although these techniques can guarantee the mechanical strength of the square grid structure, these cannot guarantee the strength of the hexagonal grid structure
[0016] As mentioned above, since these techniques involve a square grid structure, even if these techniques are used in a hexagonal grid structure, the mechanical strength of the hexagonal grid structure will not be sufficiently improved

Method used

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  • Hexagonal-cell honeycomb structure
  • Hexagonal-cell honeycomb structure
  • Hexagonal-cell honeycomb structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Referring to the drawings, wherein like reference numerals designate like parts in the various figures, and in particular to Fig. 1, there is shown a hexagonal mesh honeycomb structure 1 according to a first embodiment of the invention.

[0035] As shown in Fig. 1, the hexagonal grid honeycomb structure 1 is a catalyst carrier for an automobile exhaust gas purification system.

[0036] The hexagonal grid honeycomb structure 1 comprises a plurality of grid walls 2, the cross-section of which is substantially hexagonal in shape and constitutes a plurality of hexagonal grid channels 3, and a circumferential grid wall 2 surrounding the outermost circumference The tubular surface 4.

[0037] The thickness t of the basic mesh wall 2a constituting a substantially perfect hexagonal shape in cross-section is 140 μm or less.

[0038] In addition, as shown in Figure 2, at the intersection formed by the three basic grid walls, a circle inscribes the contours of the openings c1-c3 ...

Embodiment 2

[0066] In this embodiment, the relationship between the diameter Da and the pitch P is investigated with the first area and the second area defined.

[0067] As shown in FIG. 7 , the first region S1 has a shape similar to that of the tubular skin 4 surrounding the cell wall 2 (shown in FIGS. 1-2 ) and includes the center O of the honeycomb structure 1 . The second area S2 is defined as the outside of the first area S1 and the inside of the skin 4 .

[0068] A simulation method for finding the relationship is as follows. Assuming that the surface shape is a perfect circle, after defining each dimension of the structure, a graphical model is made and analyzed by a graphical simulation software PATRAN (trademark). Afterwards, SOLVER data processing for the calculation model is carried out by a stress analysis software MARC, and post-processing is carried out by PATRAN.

[0069] When Dax / P is less than 0.13 in the first region S1, the value of S2 / S1 capable of withstanding exter...

Embodiment 3

[0072] As shown in FIG. 8, this embodiment relates to an exhaust gas purification system 5 equipped with first and second exhaust gas purification sections 51, 52, each carrying a catalyst on a ceramic honeycomb structure.

[0073] The first exhaust gas purification section 51 , arranged upstream of the exhaust gas purification system 5 , includes the hexagonal mesh honeycomb structure 1 according to Embodiment 1.

[0074] The exhaust gas purification system 5 is installed in an exhaust pipe of an internal combustion engine 50 . More specifically, the first exhaust gas purification portion 51 is connected with an exhaust pipe 59 protruding from the internal combustion engine 50 , and the second exhaust gas purification portion 52 is connected with an exhaust pipe 58 arranged downstream of the first exhaust gas purification portion 51 . Oxygen sensors 61 , 62 for detecting the concentration of oxygen in the exhaust gas are installed in the exhaust pipes 58 , 59 .

[0075] The ...

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Abstract

A hexagonal-cell honeycomb structure having a plurality of cell walls having a hexagonal shape in cross-section and forming a plurality of hexagonal cell passages, and a tubular skin layer surrounding the cell walls, The thickness of the basic cell walls is 140 mum or less and an inscribed circle diameter Da inscribed at an intersectional portion of the basic cell walls 2 and an cell pitch P having the relationship Da / P>=0.13.

Description

technical field [0001] The present invention relates to a hexagonal mesh honeycomb structure with high mechanical strength and with thin cell wall thickness. Background technique [0002] In the exhaust gas purification system of automobiles, the purpose of the ceramic honeycomb structure used as a catalyst carrier is to activate the carried catalyst early. Therefore, the ceramic honeycomb structure is required to have a thin wall thickness of 140 μm or less in order to reduce heat capacity through reduction in overall weight. [0003] Generally speaking, the ceramic honeycomb structure as a catalyst carrier accepts external pressure to a certain extent. Because the thin wall thickness reduces the damage resistance, it is concerned that the strength of the ceramic honeycomb structure against external pressure will be reduced. In particular, the hexagonal mesh honeycomb structure has a more serious problem that its strength against destruction is more reduced than that of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00B01J35/04B01J35/10
Inventor 濑川佳秀近藤寿治
Owner DENSO CORP
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