Exhaust gas treating device and manufacturing method of honeycomb structure

Patent metadata

Field	Value
Publication number	US-10155189-B2
Application number	US-201615248143-A
Country	US
Kind code	B2
Filing date	Aug 26, 2016
Priority date	Sep 4, 2015
Publication date	Dec 18, 2018
Grant date	Dec 18, 2018

Abstract

An exhaust gas treating device includes a honeycomb structure including an inner honeycomb structure body including a honeycomb substrate having porous inner partition walls and a circumferential wall disposed at a circumference of the honeycomb substrate, an outer honeycomb structure body disposed at a position which surrounds a part of a circumference of the inner honeycomb structure body and is away from the inner inflow end face, and plugging portions; and a can member storing the honeycomb structure. The can member includes an inflow tube and a barrel portion which is continuous with the inflow tube, and in the barrel portion an outlet is formed, the honeycomb structure is stored in the can member in a state of having a clearance between a second end face and the can member and having a clearance between the outer outflow end face and the can member.

First claim

What is claimed is:

1. An exhaust gas treating device comprising:
a honeycomb structure having porous partition walls defining a plurality of cells extending from a first end face which is one end face to a second end face which is the other end face; and
a can member which stores the honeycomb structure,
wherein the honeycomb structure comprises an inner honeycomb structure body including a honeycomb substrate having porous inner partition walls defining the plurality of cells extending from an inner inflow end face which is the end face on the side of the first end face to an inner outflow end face which is the end face on the side of the second end face and a circumferential wall disposed at a circumference of the honeycomb substrate, an outer honeycomb structure body disposed at a position which surrounds a part of a circumference of the inner honeycomb structure body and is away from the inner inflow end face of the inner honeycomb structure body, the outer honeycomb structure body has porous outer partition walls defining the plurality of cells extending from an outer inflow end face which is the end face on the side of the second end face to an outer outflow end face which is the end face on the side of the first end face, wherein the inner outflow end face of the inner honeycomb structure body is aligned with the outer inflow end face of the outer honeycomb structure body, and plugging portions arranged in parts of the cells,
the can member comprises an inflow tube which fits with an end portion of the inner honeycomb structure body on the side of the inner inflow end face and in which an inlet of an exhaust gas is formed, and a barrel portion which is continuous with the inflow tube,
in the barrel portion, an outlet of the exhaust gas is formed at a position between the inner inflow end face of the inner honeycomb structure body and the outer outflow end face of the outer honeycomb structure body, and
the honeycomb structure is stored in the can member in a state of having a clearance which serves as a through channel for the exhaust gas between the second end face and the can member and having a clearance which serves as a through channel for the exhaust gas between the outer outflow end face of the outer honeycomb structure body and the can member.

2. The exhaust gas treating device according to claim 1 ,
wherein the plugging portions are not arranged in the inner honeycomb structure body or are arranged only in one end portion of the inner honeycomb structure body, and the plugging portions are arranged only in one of end portions of the outer honeycomb structure body or are arranged in both of the end portions.

3. The exhaust gas treating device according to claim 2 ,
wherein the plugging portions are arranged in end portions of the predetermined cells on the side of the outer inflow end face and end portions of the residual cells on the side of the outer outflow end face among the cells of the outer honeycomb structure body, and the plugging portions are not arranged in the inner honeycomb structure body.

4. The exhaust gas treating device according to claim 2 ,
wherein the plugging portions are arranged in parts of end portions of the inner honeycomb structure body on the side of any one of the inner inflow end face and the inner outflow end face.

5. The exhaust gas treating device according to claim 1 ,
wherein a thickness of the outer partition walls of the outer honeycomb structure body is larger than a thickness of the inner partition walls of the inner honeycomb structure body.

6. The exhaust gas treating device according to claim 1 ,
wherein a cell density of the outer honeycomb structure body is smaller than a cell density of the inner honeycomb structure body.

7. The exhaust gas treating device according to claim 1 ,
wherein the circumferential wall of the inner honeycomb structure body is formed integrally with the inner partition walls of the inner honeycomb structure body.

8. The exhaust gas treating device according to claim 1 ,
wherein in the can member, an outlet for EGR which connects with a route to recirculate the exhaust gas is formed at a position between the inner inflow end face of the inner honeycomb structure body and the outer outflow end face of the outer honeycomb structure body.

9. The exhaust gas treating device according to claim 1 ,
wherein a sound absorbing material is disposed in a clearance between the second end face of the honeycomb structure and the can member.

10. A manufacturing method of a honeycomb structure comprising:
a honeycomb formed body preparing step of preparing a honeycomb formed body comprising partition walls defining a plurality of cells extending from an inflow end face which is one end face to an outflow end face which is the other end face, and a dividing wall which divides a cross section perpendicular to an extending direction of the cells into an outer portion and an inner portion;
a plugging arrangement step of charging end portions of parts of the cells of the prepared honeycomb formed body with a plugging slurry to arrange plugging portions, thereby obtaining a plugged honeycomb formed body;
a firing step of firing the prepared plugged honeycomb formed body to obtain a honeycomb fired body; and
a honeycomb structure preparing step of grinding a part of the outer portion of the honeycomb fired body from the one end face to expose a part of the dividing wall, thereby obtaining the honeycomb structure,
wherein the honeycomb structure comprises an inner honeycomb structure body including a honeycomb substrate having porous inner partition walls defining the plurality of cells extending from an inner inflow end face which is the end face on the side of the first end face to an inner outflow end face which is the end face on the side of the second end face and a circumferential wall disposed at a circumference of the honeycomb substrate, and an outer honeycomb structure body disposed at a position which surrounds a part of a circumference of the inner honeycomb structure body and is away from the inner inflow end face of the inner honeycomb structure body, the outer honeycomb structure body has porous outer partition walls defining the plurality of cells extending from an outer inflow end face which is the end face on the side of the second end face to an outer outflow end face which is the end face on the side of the first end face, and
wherein the inner outflow end face of the inner honeycomb structure body is aligned with the outer inflow end face of the outer honeycomb structure body, and plugging portions arranged in parts of the cells.

Assignees

• Ngk Insulators Ltd

Inventors

• Aoki Takashi

Classifications

• F01N2470/18

  the axis of inlet or outlet tubes being other than the longitudinal axis of apparatus · CPC title

• B01D46/2422 Primary

  Mounting of the body within a housing · CPC title

• F01N3/2828

  Ceramic multi-channel monoliths, e.g. honeycombs · CPC title

• B01D46/0001

  Making filtering elements · CPC title

• F01N3/035

  with catalytic reactors · CPC title