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Improved honeycomb filters

A filter and ceramic honeycomb technology, which is applied in the field of extruded honeycomb ceramic filters, can solve the problems of inability to take into account damage, limited flexibility, broken edges, etc.

Inactive Publication Date: 2012-09-05
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the problem encountered with these corners is the limited flexibility at the thick walls of the corner, failure to take into account damage that may occur during handling (i.e. sharp corners that still have chamfers, cannot have sufficiently hard corners in the corners) hard coat dies, and does not exactly reproduce the intended shape (this is described by US Patent Publication 2006 / 029333), thus potentially causing stress concentrations that lead to broken edges, etc.)

Method used

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Examples

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Embodiment 1

[0033] Using an asymmetric 45-degree model, 8-node plane strain elements, under a 45-degree load of 1 N per mm cell length, using finite element analysis will have figure 1 Honeycomb modeling of the corner shown in , with two equal circle radii, two straight chamfers, and a different circle radius. exist figure 1 The units shown in are in millimeters. The material properties were chosen to reflect typical ceramic material properties, ie a material modulus of 30,000 MPa and a Poisson's ratio of 0.25. The maximum stress under the applied load at the corner is 32.8 MPa, and this maximum load deviates from the midpoint of the corner of the wall surface in the channel.

Embodiment 2

[0035] Using the same material constants as described above will have figure 2 Honeycomb modeling of the corner shown in , which has two identical circle radii and one different circle radius. The maximum stress under the applied load at the corner is 30.6 MPa, and this maximum load deviates from the midpoint of the corner of the wall surface in the channel.

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Abstract

An improved ceramic honeycomb filter wherein the ceramic honeycomb filter has at least one outer corner having a shape, when viewed looking down the channels of the honeycomb, that is comprised of (i) at least two circular arcs wherein at least one of said circular arcs has a different radius of curvature than the other circular arc or arcs, (ii) a non-circular arc, or (iii) at least four straight chamfers in the absence of any arcs.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Patent Application 60 / 927,653. field of invention [0003] The present invention relates to an improved ceramic honeycomb particulate filter. In particular, the present invention relates to extruded honeycomb ceramic filters having increased strength and increased resistance to handling damage. Background of the invention [0004] Diesel engines, due to the way they operate, emit both (particulate) condensate or agglomerates of soot particles or very fine liquid droplets, as well as typical noxious gasoline engine exhaust gases (ie, HC and CO). These "particulates" (in this case diesel soot) are rich in condensed, multinuclear hydrocarbons, some of which may be carcinogenic. [0005] As awareness of the health hazards of the dangerous diesel soot conflicts with the demand for greater fuel efficiency offered by diesel engines, regulations have been enacted to curb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D46/24
CPCF01N2330/30F01N3/0222B01D2046/2496B01D2279/30B01D46/2455B01D46/2429B01D46/2451B01D46/2425Y02T10/20Y10S55/30Y02T10/12B01D46/2498B01D46/24B01D39/00F01N3/022B01J35/56B01D46/2486
Inventor 杰弗里·D·扎维沙
Owner DOW GLOBAL TECH LLC
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