# US 11,077,397 B2 · Honeycomb filter

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- Number: US 11,077,397 B2
- Document ID: US11077397B2
- Status: Granted
- Kind: B2
- Application number: 15/950,509
- Filed: 2018-04-11
- Published: 2018-11-15
- Granted: 2021-08-03
- Earliest claimed: 2017-05-12
- Assignees: NGK Insulators, Ltd.
- Applicants: Ngk Insulators, Ltd.
- Inventors: Yasushi Kato; Takahiro Kondo
- Web page: https://patentgrep.com/patent/US11077397B2

## CPC

- B01D 46/247: {of the cells}
- B01D 46/2478: {Structures comprising honeycomb segments}
- B01D 46/2482: {Thickness, height, width, length or diameter}
- B01D 46/2486: {characterised by the shapes or configurations}
- B01J 35/57: Honeycombs
- B01D 46/2498: {The honeycomb filter being defined by mathematical relationships}
- B01D 53/94: by catalytic processes
- B01D 53/9418: {for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas}
- B01D 2255/50: Zeolites
- B01D 2255/915: Catalyst supported on particulate filters
- B01D 2255/9155: Wall flow filters
- B01D 2279/30: for treatment of exhaust gases from IC Engines
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS

## 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 row and a curvature radius R (μm) of a curved shape of corner portions of a polygonal shape of each cell satisfy a relation of Equation (1) below: Equation (1): 0.4 (R/1000)/((P1+P2)/2) 100 20.

## Claims

### Claim 1

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,
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,
a width P1 (mm) of the first cell row, a width P2 (mm) of the second cell row and the curvature radius R (μm) satisfy a relation of Equation (1) mentioned below:
0.4≤(R/1000)/((P1+P2)/2)×100≤20, and Equation (1):
the width P1 (mm) of the first cell row and the width P2 (mm) of the second cell row satisfy a relation of Equation (2) mentioned below:
2≤100−(P2/P1×100)≤50. Equation (2):

### Claim 2 (depends on 1)

The honeycomb filter according to claim 1, wherein an average value of the width P1 of the first cell row and the width P2 of the second cell row is from 0.7 to 3.5 mm.

### Claim 3 (depends on 1)

The honeycomb filter according to claim 1, wherein the width P1 of the first cell row is from 0.7 to 4.0 mm.

### Claim 4 (depends on 1)

The honeycomb filter according to claim 1, wherein the width P2 of the second cell row is from 0.7 to 2.7 mm.

### Claim 5 (depends on 1)

The honeycomb filter according to claim 1, wherein in the cross section perpendicular to the extending direction of the cells, a ratio N2/N1 of the number N2 of the second cell rows to the number N1 of the first cell rows is from 1/4 to 4.0.

### Claim 6 (depends on 1)

The honeycomb filter according to claim 1, wherein in the first cell row, the inflow cells and the through-cells are alternately arranged in a row extending direction.

### Claim 7 (depends on 1)

The honeycomb filter according to claim 1, wherein in the first cell row, the outflow cells and the through-cells are alternately arranged in a row extending direction.

### Claim 8 (depends on 1)

The honeycomb filter according to claim 1, wherein in the second cell row, the inflow cells and the outflow cells are alternately arranged in a row extending direction.

### Claim 9 (depends on 1)

The honeycomb filter according to claim 1, wherein the second cell rows include a cell row in which only the inflow cells are linearly arranged along the one direction.

### Claim 10 (depends on 1)

The honeycomb filter according to claim 1, wherein the second cell rows further include a cell row in which only the outflow cells are linearly arranged along the one direction.

### Claim 11 (depends on 1)

The honeycomb filter according to claim 1, comprising two or more regions having different constitutions of the cell row in the cross section perpendicular to the extending direction of the cells, wherein the honeycomb structure body is present in at least a part of the region.

### Claim 12 (depends on 1)

The honeycomb filter according to claim 1, comprising a plurality of honeycomb structure bodies, wherein each of the honeycomb structure bodies is constituted of a pillar-shaped honeycomb segment, and side surfaces of a plurality of honeycomb segments are bonded to one another by a bonding layer.