초록 ▼

In a solid particulate filter of honeycomb structure comprising a matrix of thin, interconnecting porous walls defining groups of inlet and outlet cells, the characteristics of fluid flow through a first subset of the thin walls, being shared in common between adjoining inlet and outlet cells, are d

In a solid particulate filter of honeycomb structure comprising a matrix of thin, interconnecting porous walls defining groups of inlet and outlet cells, the characteristics of fluid flow through a first subset of the thin walls, being shared in common between adjoining inlet and outlet cells, are differentially controlled relative to that of a second subset of thin walls, being shared in common between adjoining inlet cells, by forming each subset with uniform thicknesses which differ between the subsets. In a brittle solid particulate filter of honycomb structure having opposing inlet and outlet end faces and cells extending therebetween, improved thermal shock capability is provided by selecting outlet cell geometries and orientations with respect to the inlet cells so as to form flexing or movable joints between some or all of the thin walls shared by adjoining inlet and outlet cells and the thin walls shared between adjoining inlet cells.

대표청구항 ▼

A filter for removing solid particulates from fluids passed therethrough comprising: a multiplicity of interconnected thin porous walls forming a matrix defining at least one inlet end face and at least one outlet end face of the filter and a multiplicity of cells each extending through the filter f

A filter for removing solid particulates from fluids passed therethrough comprising: a multiplicity of interconnected thin porous walls forming a matrix defining at least one inlet end face and at least one outlet end face of the filter and a multiplicity of cells each extending through the filter from at least one of the inlet or outlet end faces, an inlet group of the cells each open only at said at least one inlet end face, an outlet group of the cells each open only at said at least one outlet end face of the filter, a first subset of the thin walls having a first uniform thickness, each first subset thin wall being shared in common by one of the outlet cells and one or more of the inlet cells adjoining the outlet cell and having an interconnected open porosity of a size and volume sufficient to allow the fluid to flow completely across the first uniform thickness of the first subset of thin walls while preventing at least a significant portion of the solid particulates in the fluid from passing completely across the first subset of thin walls, a second subset of the thin walls having a second uniform thickness, each second subset thin wall interconnecting with at least one thin wall of the first subset and forming a common wall between a pair of adjoining inlet cells and having an interconnected open porosity of a size and volume sufficient to allow fluid to flow completely through the longer dimensions of each of the second subset thin walls to the interconnected thin wall of the first subset and to prevent at least a significant portion of the solid particulates from passing either completely across or through the second subset of thin walls in any direction, and said first uniform thickness differing from said second uniform thickness. In a method of fabricating a filter of honeycomb structure for removing solid particulates from fluids passed through the filter comprising the steps of (a) providing a matrix of thin brittle interconnected porous walls defining an inlet end face and outlet end face on opposite sides of the filter and a multiplicity of cells extending between the inlet and outlet faces and through the filter and further having interconnected open porosity of a size and volume sufficient to enable fluid to flow completely across the thickness of the thin walls and to restrict at least a significant portion of the solid particulates from flowing either completely across or through the thin walls in any direction, (b) forming an inlet group of cells open at the inlet end face and closed at the outlet end face and an outlet group of cells open at the outlet end face and closed near the inlet end face, a first subset of the thin walls being shared in common by adjoining inlet and outlet cells and a second subset of the thin walls being shared in common by pairs of adjoining inlet cells, the improvement comprising the step of intersecting in a substantially perpendicular fashion each of the thin walls of the first subset with a thin wall of the second subset whereby a flexing joint is formed therebetween.