Honeycomb filter
AssigneeNGK Insulators, Ltd.
InventorsYasushi Kato, Takahiro Kondo
Life of this patent
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Abstract
A honeycomb filter includes a plugged honeycomb structure body which has cell rows arranged along one direction in a cross section of the honeycomb structure body and including a first cell row constituted of at least one of an inflow cell and an outflow cell, and a through-cell, and a second cell row including no through-cells. A width P1 (mm) of the first cell row, a width P2 (mm) of the second cell and a curvature radius R of a curved shape of corner portions of a polygonal shape of each cell satisfy relations of Equations (1) and (2) below: Equation (1): 2≤100−(P1/P2×100)≤50, and Equation (2): 0.4≤(R/1000)/((P1+P2)/2)×100≤20.
Claims17
A honeycomb filter comprising:
- a honeycomb structure body having porous partition walls arranged to surround a plurality of cells extending from an inflow end face to an outflow end face to form through channels for a fluid, and
- a plugging portion disposed to plug either one of end portions of each of cells of parts of the plurality of cells on the side of the inflow end face or the side of the outflow end face,
- wherein among the plurality of cells,
- cells in which the plugging portions are arranged in end portions on the outflow end face side and which are opened on the inflow end face side are defined as inflow cells,
- cells in which the plugging portions are arranged in end portions on the inflow end face side and which are opened on the outflow end face side are defined as outflow cells,
- cells in which the plugging portions are not arranged and which are opened on both of the inflow end face side and the outflow end face side are defined as through-cells,
- the honeycomb structure body has a plurality of cell rows in which two or more cells are linearly arranged along one direction, in a cross section of the honeycomb structure body which is perpendicular to an extending direction of the cells,
- the plurality of cell rows include a first cell row and a second cell row,
- the first cell row is a cell row constituted of at least one of the inflow cell and the outflow cell, and the through-cell,
- the second cell row is a cell row which does not include the through-cells in the cells linearly arranged along the one direction,
- a width P1 (mm) of the first cell row and a width P2 (mm) of the second cell row satisfy a relation of Equation (1) mentioned below,
- in the cross section perpendicular to the extending direction of the cells, each of the cells has a polygonal shape of which corner portions are formed in a curved shape of a curvature radius R, and
- the width P1 (mm) of the first cell row, the width P2 (mm) of the second cell row and the curvature radius R (μm) satisfy a relation of Equation (2) mentioned below:
- 2≤100−(P1/P2×100)≤50, and Equation (1):
- 0.4≤(R/1000)/((P1+P2)/2)×100≤20. Equation (2):
Dependencies are inferred from the claim text.