JP2016030230A - Honeycomb structure, and production method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a honeycomb structure which can surely be fixed in a vessel.SOLUTION: The honeycomb structure 10 includes a honeycomb structure body 20 which: has an outside wall 21, which is formed from porous ceramic and constitutes a side surface, and inside walls 25, which are used for partitioning the internal space surrounded by the outside wall 21 in a grid pattern; and the cross-sectional shape of which is continued from one end face 11 to the other end face 12 along the longitudinal direction. A convex part 23 is arranged on such a crossing line that the outside surface 211 of the outside wall 21 has a crossing with the surface perpendicular to the longitudinal direction of the honeycomb structure body 20. As a result, a locking part 37 for locking the convex part 23 of the honeycomb structure 10 is arranged on the side of a metallic pipe 30 for housing the honeycomb structure 10 so that the honeycomb structure 10 can surely be fixed mechanically in the metallic pipe 30.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a honeycomb structure accommodated in a container.

Conventionally, a fixing method for accommodating a honeycomb structure inside a container has been proposed (see, for example, Patent Document 1).
In the catalyst holding body (honeycomb structure) of Patent Document 1, an inorganic fiber (crystalline alumina fiber) mat is wound around almost the entire side surface of a cylindrical honeycomb structure, and an organic sheet is wound around the outer side, and a metal pipe ( The container is press-fitted into the container. At this time, the bulk density before press-fitting and the bulk density after press-fit of the inorganic fiber mat are limited to a predetermined range.

That is, the friction density generated between the honeycomb structure and the inorganic fiber mat by press-fitting into the metal pipe so that the bulk density after the press-fitting of the inorganic fiber mat is larger than the bulk density before the press-fitting, The honeycomb structure is fixed inside the metal pipe by a frictional force generated between the inorganic fiber mat and the metal pipe.
This technique is widely known as a technique for fixing a filter (DPF) for purifying exhaust gas of a diesel engine in a metal pipe in addition to a catalyst holding body.

JP 2004-98059 A

  However, if the honeycomb structure has a cylindrical shape such as a cylindrical shape, the position of the honeycomb structure is shifted in the longitudinal direction when wind pressure or the like acts in the longitudinal direction of the honeycomb structure even if a frictional force is applied. there is a possibility.

  In view of the above problems, an object of the present invention is to provide a honeycomb structure that can be reliably fixed in a container.

  A honeycomb structure of the present invention for solving the above problems is formed of a porous ceramic, and has an outer wall that constitutes a side surface, and an inner wall that divides an internal space surrounded by the outer wall in a lattice shape, A cross-section where a honeycomb structure body having a continuous cross-sectional shape along a longitudinal direction from one end face to the other end face, an outer surface of the outer wall, and a plane orthogonal to the longitudinal direction of the honeycomb structure body And a convex portion provided on the line.

The honeycomb structure of the present invention is formed of a porous ceramic, has an inner space surrounded by an outer wall, has a lattice-shaped inner wall, and the outer surface of the honeycomb structure body having a continuous cross-sectional shape along the longitudinal direction. Protrusions are provided.
For this reason, by providing a locking portion having a shape that conforms to the shape of the convex portion of the honeycomb structure inside a container such as a metal pipe that accommodates the honeycomb structure, the honeycomb structure can be reliably and mechanically provided. Can be fixed inside.

Furthermore, the honeycomb structure of the present invention desirably has the following aspect.
(1) The convex portion is a convex strip that circulates along the intersecting line.
With such a structure, the honeycomb structure can be more firmly fixed. Moreover, the airtightness of the honeycomb structure can be ensured by bringing the convex portions (protrusions) into close contact with the engaging portions on the container side.
Here, the term “ridge” refers to a shape in which protrusions are continuous with the outer surface of the honeycomb structure body as a reference plane. The height from the reference plane of the ridges may fluctuate in the longitudinal direction of the ridges, or may be constant with respect to the longitudinal direction of the ridges. Examples of the shape in which the height from the reference surface of the ridge is constant with respect to the longitudinal direction of the ridge include a shape like a rail of a railway. If the height of the ridges is constant in the longitudinal direction, the shape is simple. Therefore, it is easy to create the projections (projections), and the shape of the locking portion on the container side can be simplified.

(2) The convex portion is provided in each region obtained by dividing the outer wall into two in the longitudinal direction.
By connecting the honeycomb structure and the container with two or more protrusions across the center in the longitudinal direction of the honeycomb structure, the stress can be distributed to the two or more protrusions. It can be stably fixed inside.

(3) The convex portions are provided at positions equidistant from the one end surface and the other end surface, respectively.
Since the honeycomb structure is connected to the container at two points that are equidistant from the center of gravity by the convex portions provided at equal distances from the both end faces, the honeycomb structure can be stably fixed in the container. Can do.

(4) The honeycomb structure main body is formed of any one of silicon carbide, cordierite, alumina, mullite, silicon nitride, aluminum titanate, and zirconia.
Since such a honeycomb structure is excellent in heat resistance and corrosion resistance, a high-temperature gas or the like can be circulated.

(5) The convex portion is formed of a fiber assembly. The fiber assembly may be a woven fabric or a non-woven fabric.
For this reason, even if the shape of a convex part is complicated, it can form easily.

(6) The convex portion is formed by melting and impregnating silicon into a carbon fiber aggregate.
For this reason, a convex part can be made into a precise | minute structure and high airtightness is acquired. In addition, since part of carbon and silicon reacts during the melt impregnation to synthesize silicon carbide, the heat resistance and corrosion resistance of the convex portions are improved.

(7) The honeycomb structure body is made of porous silicon carbide, and is further formed by melt impregnation of silicon.
When the honeycomb structure body is formed by melting and impregnating silicon into porous silicon carbide, and the protrusions are formed by melting and impregnating silicon into a carbon fiber aggregate, the honeycomb structure body and the protrusions Since the difference in characteristics is small, cracks due to expansion / contraction are unlikely to occur, and durability is improved.

(8) The honeycomb structure main body includes a container in which a locking portion having a shape matching the shape of the convex portion is formed, and the convex portion and the locking portion are joined together, It is fixed inside the container.
A locking portion having a shape that matches the shape of the convex portion of the honeycomb structure is provided inside the container that accommodates the honeycomb structure, and the convex portion and the locking portion are joined to fix the honeycomb structure in the container. Has been. For this reason, the honeycomb structure is firmly fixed in the container. Regardless of the material of the container (whether it is made of metal or resin), a porous ceramic honeycomb structure can be fixed to the container.

According to the method for manufacturing a honeycomb structured body of the present invention for solving the above-described problem, the outer wall includes a side surface, and the inner wall that partitions the internal space surrounded by the outer wall in a lattice shape, and has one end surface. A honeycomb structure having a continuous cross-sectional shape along the longitudinal direction from the other end face to the other end face is formed of a porous ceramic.
On the intersection line where the outer surface of the outer wall intersects the plane perpendicular to the longitudinal direction of the honeycomb structure, a convex portion formed of a carbon fiber aggregate is installed, and the convex portion is melt-impregnated with silicon Let

In the method for manufacturing a honeycomb structure of the present invention, after forming a honeycomb structure from a porous ceramic, a projecting portion is formed from a carbon fiber aggregate on the outer surface of the honeycomb structure, and then the carbon fiber aggregate is formed. The convex part made of the body is melt-impregnated with silicon.
Since the carbon fiber aggregate is excellent in processability, it is possible to easily form a convex portion having an arbitrary shape. Furthermore, by impregnating silicon, the convex portion becomes dense and silicon carbide is synthesized from carbon and silicon, so that a convex portion excellent in airtightness, physical strength, heat resistance, and corrosion resistance can be obtained. it can.

  The honeycomb structure of the present invention is made of porous ceramic, has an inner wall that divides an internal space surrounded by an outer wall in a lattice shape, and has a continuous cross-sectional shape along the longitudinal direction. And the convex part is provided on the intersection line which the outer side surface of an outer wall and the surface orthogonal to the longitudinal direction of a main body cross | intersect. For this reason, the honeycomb structure can be mechanically reliably fixed in the container by providing a locking portion having a shape that matches the shape of the convex portion of the honeycomb structure on the container side that accommodates the honeycomb structure. it can.

1 is an overall perspective view of a honeycomb structure according to an embodiment of the present invention. 1 is an exploded perspective view of a honeycomb structure and a container that accommodates the honeycomb structure according to an embodiment of the present invention. (A) thru | or (C) is sectional drawing which shows the process of accommodating the honeycomb structure of embodiment which concerns on this invention. (A) thru | or (C) are sectional drawings etc. which show the modification of a convex part and a latching | locking part.

  The honeycomb structure of the present invention will be described.

As shown in FIGS. 1 and 2, a honeycomb structure 10 according to an embodiment of the present invention has a honeycomb structure body 20 formed in a cylindrical shape from a porous fired body. In addition, although the case where the honeycomb structure main body 20 has a quadrangular cylindrical shape is illustrated here, it may be a cylindrical shape or a polygonal cylindrical shape.
The honeycomb structure main body 20 has a rectangular tubular outer wall 21. The internal space 22 surrounded by the outer wall 21 is partitioned in a lattice shape by the inner wall 25 and has a rectangular cross-section flow path 26 extending from the first end surface 11 as one end surface in the longitudinal direction to the second end surface 12 as the other end surface. A plurality.

On the outer surface 211 of the outer wall 21 of the honeycomb structure body 20, convex portions 23 are provided in the vicinity of both ends in the longitudinal direction of the honeycomb structure body 20. Each convex portion 23 is provided on an intersecting line where the outer surface 211 intersects a surface orthogonal to the longitudinal direction of the honeycomb structure body 20. That is, when the honeycomb structure main body 20 is a rectangular parallelepiped or a cube, the convex portion 23 is provided over the entire circumference of the honeycomb structure main body 20 in parallel with the first end face 11 and the second end face 12.
Each convex part 23 has a pair of convex strips 231 and 231 at a predetermined interval, and a groove 24 is provided between the pair of convex strips 231 and 231. The groove 24 is not recessed with respect to the outer wall 21, and here, the bottom surface 241 of the groove 24 is the outer surface 211 of the outer wall 21 (see FIG. 3A). The width of the ridge 231 is, for example, about 1 to 5 mm, the width of the groove 24 is, for example, about 1 to 5 mm, and the width of the entire protrusion 23 is, for example, about 3 to 15 mm.

  The same member can be used for the pair of ridges 231 and 231. The ridge 231 is formed of a fiber assembly. For example, the ridge 231 may be formed by forming a carbon felt (carbon fiber aggregate) in a predetermined shape. Alternatively, a crystalline alumina fiber mat formed into an elongated tape shape can be used. A region R (see FIG. 3A) in contact with the ridges 231 and the outer surface 211 of the honeycomb structure body 20 is impregnated with Si in advance. The region impregnated with Si may be only the region R, or the entire protrusion 231 and the honeycomb structure body 20 may be impregnated with Si. The width of the region R is slightly wider than the entire width of the convex portion 23 and is about 5 to 15 mm. Thereafter, the ridges 231 formed with carbon felt in a predetermined shape are disposed on the honeycomb structure main body 20, and the ridges 231 are melt-impregnated with Si.

  Thereby, the honeycomb structure main body 20 and the convex part 23 are integrated. Note that the region R does not necessarily need to be impregnated with Si in advance, and the protrusions 231 may be disposed before the Si impregnation, and the protrusions 231 and the honeycomb structure main body 20 may be simultaneously melt-impregnated with Si.

As shown in FIG. 2, a container that accommodates the honeycomb structure 10, for example, a metal pipe 30 that is an exhaust pipe, has a main body portion 31 that accommodates the honeycomb structure 10. An inflow passage 32 that supplies fluid to the main body 31 is connected to one end of the main body 31 via a funnel-shaped connection portion 33. In addition, an outflow passage 34 for discharging fluid from the main body 31 is connected to the other end of the main body 31 via a funnel-shaped connection portion 35.
The main body 31 is provided with a lid member 36 that is divided near the center in the height direction. For this reason, the honeycomb structure 10 can be mounted in the metal pipe 30 by removing the lid member 36. The lid member 36 is attached to the main body 31 so as to cover the honeycomb structure 10 after the honeycomb structure 10 is accommodated in the main body 31 of the metal pipe 30.

On the inner surface 311 of the main body 31 and the inner surface 361 of the lid member 36, locking portions 37 that lock the convex portions 23 are provided at both longitudinal ends of the main body 31 and the lid member 36, respectively. Each locking portion 37 includes a locking portion 371 on the honeycomb structure body 20 side and a locking portion 372 on the lid member 36 side.
As shown in FIG. 3 (A), the locking portion 37 has a base portion 38 attached to the honeycomb structure body 20 or the lid member 36, and a protrusion 39 protruding from the base portion 38, and has a T-shaped cross section. It has a shape. The width of the protrusion 39 corresponds to the distance between the pair of protrusions 231 in the protrusion 23 of the honeycomb structure body 20, and the locking portion 37 locks the protrusion 23. Therefore, the interval between the pair of locking portions 37 corresponds to the interval between the pair of convex portions 23.

Next, a procedure for fixing the honeycomb structure 10 to the metal pipe 30 will be described.
First, as shown in FIG. 3A, the pair of convex portions 23 of the honeycomb structure 10 are positioned at the positions of the pair of locking portions 37 of the main body portion 31 of the metal pipe 30.
Next, as shown in FIG. 3B, the protrusions 39 of the respective locking portions 37 are fitted into the grooves 24 of the respective convex portions 23 and locked.
In addition, when the engaging part 37 is made of a material having flexibility without impregnating the convex part 23 with Si, the engaging part 37 is engaged from the outside of the metal pipe 30 as shown in FIG. A pressing force F is applied to the portion 37 and tightened. Thereby, the convex part 23 and the latching | locking part 37 deform | transform, and the metal pipe 30 and the honeycomb structure 10 are connected.

Next, functions and effects of the honeycomb structure 10 of the present embodiment will be described.
The honeycomb structure 10 of the present embodiment includes a honeycomb structure main body 20 formed in a cylindrical shape from a porous ceramic, and an inner wall 25 that partitions an internal space 22 of the honeycomb structure main body 20 in a lattice shape. The cross-sectional shape is continuous along the longitudinal direction of the structure body 20. And the convex part 23 is provided on the intersection line where the outer side surface 211 of the honeycomb structure main body 20 and the surface orthogonal to the longitudinal direction of the honeycomb structure main body 20 intersect.
For this reason, by providing a locking portion 37 for locking the convex portion 23 of the honeycomb structure 10 on the side of the metal pipe 30 that accommodates the honeycomb structure 10, the honeycomb structure 10 is mechanically and reliably made of metal. It can be fixed in the pipe 30.

Moreover, according to the honeycomb structure 10 of the present embodiment, the convex portion 23 is configured by the two convex strips 231 that circulate along the intersecting line.
For this reason, it can fix reliably with respect to the movement with respect to the longitudinal direction of the honeycomb structure 10. FIG. Moreover, the airtightness of the honeycomb structure 10 is securable by making the convex part 23 closely_contact | adhere with the latching | locking part 37 by the side of the metal pipe 30. FIG.

  Further, according to the honeycomb structure 10 of the present embodiment, the convex portions 23 are provided in the vicinity of the first end surface 11 and the second end surface 12 which are both ends in the longitudinal direction of the honeycomb structure body 20. For this reason, the honeycomb structure 10 can be reliably fixed in the metal pipe 30 and the airtightness can be maintained.

The honeycomb structure of the present invention is not limited to the embodiment described above, and appropriate modifications and improvements can be made.
For example, in the above-described embodiment, the case where the convex portion 23 is configured by the pair of convex strips 231 provided at predetermined intervals and the locking portion 37 having a T-shaped cross section is provided is illustrated.
In addition, as shown in FIG. 4A, a convex portion 27 having a concave cross section can be used for the locking portion 37 having the same shape as that of the above-described embodiment.

Further, as shown in FIG. 4B, in the honeycomb structure 10, the convex portion 28 is constituted by one convex strip 231, and in the metal pipe 30, a locking portion 41 having a concave cross section is used. be able to.
Furthermore, as shown in FIG. 4C, the convex portions 29 provided on the honeycomb structure 10 can be provided in a stepping stone shape so that the blocks are arranged at a predetermined interval instead of being continuous. In FIG. 4C, one row of convex portions 29 is illustrated, but a plurality of rows may be used. In addition, as the locking portion at this time, the locking portion 41 (see FIG. 4B) described above can be used.

  The honeycomb structure of the present invention can be used for a honeycomb structure housed in a container.

DESCRIPTION OF SYMBOLS 10 Honeycomb structure 20 Main body 211 Outer side surface 22 Inner space 23 Convex part 25 Inner wall

Claims (10)

A cross-sectional shape formed along the longitudinal direction from one end face to the other end face, which is formed of porous ceramic, has an outer wall that constitutes a side surface, and an inner wall that divides the inner space surrounded by the outer wall in a lattice shape A continuous honeycomb structure body,
A convex portion provided on an intersecting line intersecting an outer surface of the outer wall and a surface perpendicular to the longitudinal direction of the honeycomb structure main body;
A honeycomb structure comprising:   The honeycomb structure according to claim 1, wherein the convex portion is a convex strip that circulates along the intersecting line.   The honeycomb structure according to claim 1 or 2, wherein the convex portion is provided in each region obtained by dividing the outer wall into two in the longitudinal direction.   The honeycomb structure according to claim 3, wherein the convex portion is provided at a position equidistant from the one end surface and the other end surface.   The honeycomb structure body is formed of any one of silicon carbide, cordierite, alumina, mullite, silicon nitride, aluminum titanate, and zirconia. 2. A honeycomb structure according to item 1.   The honeycomb structure according to any one of claims 1 to 5, wherein the convex portion is formed of a fiber assembly.   The honeycomb structure according to any one of claims 1 to 5, wherein the convex portion is formed by melting and impregnating a carbon fiber aggregate with silicon.   The honeycomb structure according to claim 7, wherein the honeycomb structure body is formed of porous silicon carbide, and the honeycomb structure body is formed by melt impregnation of silicon. A container having a locking portion having a shape that conforms to the shape of the convex portion formed therein,
The honeycomb structure according to any one of claims 1 to 8, wherein the convex portion and the locking portion are joined to each other to be fixed inside the container. A honeycomb structure having an outer wall that constitutes a side surface and an inner wall that divides an internal space surrounded by the outer wall in a lattice shape and has a continuous cross-sectional shape along a longitudinal direction from one end surface to the other end surface Formed by porous ceramics,
On the intersection line where the outer surface of the outer wall intersects the plane perpendicular to the longitudinal direction of the honeycomb structure, a convex portion formed of a carbon fiber aggregate is installed, and the convex portion is melt-impregnated with silicon A method for manufacturing a honeycomb structure, characterized by comprising:

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