JP3803008B2 - Exhaust gas purification catalytic converter - Google Patents

Description

[0001]
【Technical field】
The present invention relates to a method of manufacturing a catalytic converter for purifying exhaust gas, and more particularly to an assembly structure of a holding seal body.
[0002]
[Prior art]
Conventionally, as shown in FIG. 4 to be described later, an exhaust gas purifying catalytic converter mainly mounted on a vehicle includes an inorganic fiber mat-like material disposed between the catalyst carrier 1 and a metal shell 95 covering the outside thereof. The holding seal body 2 is made of.
[0003]
The catalyst carrier 1 carries a catalyst component such as platinum. As the catalyst carrier 1, for example, there is a honeycomb body made of cordierite. The exhaust gas purifying catalytic converter 90 is disposed in the middle of an exhaust pipe 99 connected to the engine E.
The shell 95 has the catalyst carrier 1 and the holding seal body 2 disposed therein, and then the inlet-side connecting portion 97 and the outlet-side connecting portion 98 are coupled to the front and rear openings.
[0004]
Next, the holding seal body 2 made of the inorganic fiber mat-like material prevents the exhaust gas from leaking out between the catalyst carrier 1 and the shell 95, and the catalyst carrier 1 is a shell when the vehicle is running. Used to prevent contact with 95 and damage.
[0005]
As a means for disposing the holding seal body 2 between the catalyst carrier 1 and the shell 95, for example, the shell 95 is divided into two semicircular parts, and the holding seal body is placed on the outer periphery of the catalyst carrier 1 therein. There is a method in which an integral product wound with 2 is put, and then the two shells 95 are joined in a cylindrical shape.
Alternatively, there is a method in which the shell 95 has a C-shaped cross section and a U-shaped cross section, the above-mentioned integrated product is put therein, and then the shell 95 is closed into a cylindrical shape.
In recent years, for example, Japanese Patent Laid-Open No. 7-197813 discloses a mounting method in which a plate-like ceramic fiber is inserted into an airtight sheet for the purpose of preventing damage and deterioration of the holding seal body. In order to improve workability and simplify the process, as shown in FIG. 2 to be described later, a cylindrical shell 95 is prepared from the beginning, and a press-fit assembly method is adopted in which the integrated product 20 is press-fitted therein. ing.
[0006]
By the way, conventionally, as a method for winding and holding the holding seal body 2 around the catalyst carrier 1, as shown in FIG. 7A, an inorganic fiber mat-like material 89 having a length necessary for the winding is prepared in advance. In addition, a recess 87 is formed at one end thereof, and a protrusion 88 having a size that fits into the recess 87 is formed at the other end by cutting.
[0007]
That is, the concave portion 87 is formed by cutting one end of the inorganic fiber mat-like material 89, and the projecting portion 88 is disposed around the other end of the inorganic fiber mat-like material 89 so that the projecting portion 88 remains. It is formed by excising.
The holding seal body 2 processed in this way is wound around the outer periphery of the catalyst carrier 1 as shown in FIG. 7 (B), and the protruding portion 88 is fitted into the recess 87. The holding seal body 2 is fixed to the outer periphery of the catalyst carrier 1 with a tape and an adhesive and assembled in the shell 95.
[0008]
In the catalytic converter 90 for purifying exhaust gas, a gap is formed at the joint portion of the inorganic fiber mat-like material 89, and exhaust gas enters this portion. There will be a difference. This temperature difference may cause cracking of the catalyst carrier 1. In order to prevent this, it is effective to eliminate the gap.
[0009]
On the other hand, conventionally, after a catalyst component such as a noble metal is supported on a catalyst carrier, it is mounted on a shell to form an exhaust gas purifying catalytic converter. However, in recent years, there has been a movement to reduce the thickness of the catalyst carrier wall in order to improve the exhaust gas purification performance. ing.
In addition, in order to comply with exhaust gas regulations, studies have also been made to burn off organic components in the holding seal body in advance.
In order to cope with these, a method in which an unsupported carrier that has not yet supported a catalyst component is assembled in a shell through a holding seal body, and then a catalyst solution is attached to the inner wall of the unsupported carrier, heated and fired, and supported. Is being considered. According to this method, the organic component in the holding sealing body can be simultaneously burned off during heating and baking.
[0010]
Next, details of a method for attaching the catalyst solution to the inner wall of the unsupported carrier after the unsupported carrier is assembled in the shell via the holding seal body will be described.
The unsupported carrier 11 around which the holding seal body 2 is wound is mounted in the shell 95, and then the catalyst component is supported on the unsupported carrier 11 as shown in FIG.
That is, the pipes 71 and 72 are pressed against the lower and upper sides of the integrated product after the assembly, and the slurry-like catalyst solution 70 is supplied into the unsupported carrier 11 in the axial direction from above and below. As a result, the catalyst solution 70 adheres to the honeycomb wall of the unsupported carrier 11.
[0011]
Thereafter, the pipes 71 and 72 are removed, and the assembly of the catalyst carrier 1, the holding seal body 2, and the shell 95 is heated to high temperature and fired. As a result, the catalyst solution 70 attached to the catalyst carrier 1 becomes a catalyst component and is supported on the catalyst carrier 1. Thereby, the exhaust gas purifying catalytic converter 90 is completed.
After that, as shown in FIG. 4 to be described later, it is arranged in the middle of the exhaust pipe 99.
[0012]
[Problems to be solved]
However, the conventional exhaust gas purifying catalytic converter 90 has the following problems.
That is, as shown in FIG. 9, since the catalyst carrier 1 and the holding seal body 2 have a dimensional tolerance, when they are wound, a gap C is formed between the end portions 881 and 871. Therefore, when the catalyst solution 70 is supplied to the unsupported carrier 11 (see FIG. 8), the catalyst solution 70 leaks out from the mating gap C. Since the catalyst metal is a noble metal, there is a problem that leakage or adhesion to other than the catalyst carrier 1 leads to an increase in cost as a product.
[0013]
In view of the conventional problems, the present invention provides an exhaust gas purifying catalyst capable of supporting a catalyst component on the catalyst carrier without leakage of the catalyst solution from the gap between the holding seal bodies when the catalyst solution is supplied to the catalyst carrier. It is intended to provide a converter.
[0014]
[Means for solving problems]
According to the first aspect of the present invention, there is provided a catalyst carrier, a shell covering the outside of the catalyst carrier, and the shell and the catalyst carrier. The inorganic fiber mat is wound around the outer periphery of the catalyst carrier. In an exhaust gas purifying catalytic converter having a holding seal body formed by
When performing the winding arrangement, after winding the inorganic fiber mat-like material longer than the outer peripheral length of the catalyst carrier around the catalyst carrier, cutting at least one end of the inorganic fiber mat-like material, The exhaust gas purifying catalytic converter is characterized in that the holding seal body is formed by opposingly arranging both ends of the inorganic fiber mat-like material.
[0015]
The most notable point in the present invention is that when the winding arrangement is performed, the inorganic fiber mat-like material longer than the outer peripheral length of the catalyst carrier is wound around the catalyst carrier, After cutting at least one end, the holding sealing body was formed by arranging both ends of the inorganic fiber mat to face each other.
[0016]
Next, the effects of the present invention will be described.
In the present invention, first, the inorganic fiber mat-like material having a length longer than the length of the outer periphery of the catalyst carrier is prepared for the winding arrangement. Then, the inorganic fiber mat is wound around the catalyst carrier. At this time, the other end overlaps with one end of the inorganic fiber mat. Since this overlapped part is an unnecessary unnecessary part, it is cut. And the edge part and edge part of the inorganic fiber mat-like material after a cutting | disconnection are made to oppose, and it accommodates in the outer periphery of a catalyst carrier, and forms the said holding | maintenance sealing body.
[0017]
That is, the cutting is performed after aligning the inorganic fiber mat-like material with an actual catalyst carrier having a dimensional error. Therefore, the inorganic fiber mat-like material can be cut into any length that is actually required for the holding seal body. For this reason, it is possible to eliminate almost no gap between the end portions of the holding seal body.
[0018]
Therefore, when the catalyst solution is supplied to the catalyst carrier, the catalyst solution does not leak to the shell side from the gap. Therefore, the noble metal contained as a catalyst component in the catalyst solution can be supported on the catalyst carrier without being wasted.
Therefore, the catalyst solution does not leak and adhere to the shell, and there is no inconvenience when welding an exhaust pipe or the like to the shell.
[0019]
Here, the allowable width for the above-mentioned alignment gap is considered as follows.
That is, the inorganic fiber mat-like material is fixed to the catalyst carrier with a fixing tool such as a tape or an adhesive after the excess portion is cut, and is made into an integral product. Next, the integrated product is assembled into the shell. Then, as described above, the catalyst solution is supplied to the catalyst carrier, and the width within the range in which the catalyst solution does not leak to the shell side is considered as the width allowed for the alignment gap.
[0020]
As described above, according to the present invention, there is provided an exhaust gas purifying catalytic converter capable of supporting a catalyst component on a catalyst carrier without leakage of the catalyst solution from the gap between the holding seal bodies when the catalyst solution is supplied to the catalyst carrier. can do.
[0021]
Next, as in the second aspect of the invention, it is preferable that the width of the alignment gap formed between the both end portions of the holding seal body is 1 mm or less.
Thereby, leakage of the catalyst solution from the alignment gap can be more reliably prevented.
[0022]
next , Touch A medium carrier, a shell that covers the outside of the catalyst carrier, a holding member that is formed between the shell and the catalyst carrier, and is formed by winding an inorganic fiber mat around the outer periphery of the catalyst carrier. In an exhaust gas purifying catalytic converter having a seal body,
When the winding arrangement is performed, the inorganic fiber mat-like material shorter than the outer peripheral length of the catalyst carrier is wound around the catalyst carrier, and formed between both ends of the inorganic fiber mat-like material. When the width of the alignment gap exceeds 1 mm, the holding seal body is formed by filling the alignment gap with a filling sheet made of the same material as the inorganic fiber mat-like material. Catalytic converter But is there.
[0023]
The most notable point in the present invention is that when the width of the alignment gap exceeds 1 mm, the holding seal body is formed by filling the alignment gap with the filling sheet.
[0024]
In the present invention, first, the inorganic fiber mat-like material having a length shorter than the length of the outer periphery of the catalyst carrier is prepared for the winding arrangement. Then, the inorganic fiber mat is wound around the catalyst carrier. At this time, the gap is formed between both ends of the inorganic fiber mat-like material. If the width of the alignment gap exceeds 1 mm, the holding gap is formed by filling the alignment gap with a filling sheet.
[0025]
That is, the mating gap is filled with a member different from the inorganic fiber mat-like material, and the width of the mating gap is set to 1 mm or less. Therefore, almost no gaps can be eliminated. Therefore, according to the present invention, there is also provided an exhaust gas purifying catalytic converter capable of supporting the catalyst component on the catalyst carrier without causing the catalyst solution to leak from the gap between the holding seal bodies when the catalyst solution is supplied to the catalyst carrier. can do.
[0026]
The filling sheet preferably has a shape that matches the shape of the alignment gap, but the alignment gap may be filled with, for example, a cotton-like sheet having no specific shape. .
[0027]
next , Touch A medium carrier, a shell that covers the outside of the catalyst carrier, a holding member that is formed between the shell and the catalyst carrier, and is formed by winding an inorganic fiber mat around the outer periphery of the catalyst carrier. In an exhaust gas purifying catalytic converter having a seal body,
When performing the winding arrangement, at least one end of the inorganic fiber mat-like material is an oblique end formed obliquely with respect to the thickness direction, and the oblique end is connected to the other end. A catalytic converter for purifying exhaust gas, wherein the holding seal body is formed so as to overlap the end portion But is there.
[0028]
The most notable point in the present invention is that at least one end of the inorganic fiber mat-like material is an oblique end formed obliquely with respect to the thickness direction, and the oblique end is the other end. The holding seal body is formed so as to overlap the portion.
[0029]
In the present invention, at the time of performing the winding arrangement, at least one end of the inorganic fiber mat-like material is cut obliquely with respect to the thickness direction to form a diagonal end. Then, the inorganic fiber mat is wound around the catalyst carrier so that the inclined end portion is located on the outer periphery of the other end portion and the inclined surface is superimposed on the other end portion, A holding seal body is formed. That is, the inclined end portion is intentionally overlapped with the other end portion so that the above-mentioned alignment gap is not formed.
[0030]
By the way, a convex portion may be formed on the surface of the holding seal body due to the overlap. However, this convex portion can be squeezed by the shell when it is assembled into the shell, and can be accommodated in the shell.
That is, the thickness of the inclined end portion is thinner than the thickness of the inorganic fiber mat-like material. Therefore, even if the overlap is intentionally made, the holding seal body can be accommodated in the shell, and the alignment gap can be eliminated. Therefore, according to the present invention, there is also provided an exhaust gas purifying catalytic converter capable of supporting the catalyst component on the catalyst carrier without causing the catalyst solution to leak from the gap between the holding seal bodies when the catalyst solution is supplied to the catalyst carrier. can do.
[0031]
Here, in the above, as the inorganic fiber mat-like material, it is preferable to use inorganic fibers such as crystalline alumina fibers, alumina-silica fibers or silica fibers, or those containing one or more kinds of these inorganic fibers. In this case, a holding seal body with excellent durability can be formed.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1
An embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 3, the exhaust gas purifying catalytic converter 10 in this example is disposed between the catalyst carrier 1, a shell 95 covering the outside of the catalyst carrier 1, and between the shell 95 and the catalyst carrier 1. A holding seal body 2 formed by winding an inorganic fiber mat-like material 200 around the outer periphery of the catalyst carrier 1;
[0033]
As shown in FIGS. 1A to 1D, when performing the above-described winding arrangement, an inorganic fiber mat-like material 200 longer than the outer peripheral length of the catalyst carrier 1 is wound around the catalyst carrier 1. Then, after cutting one end portion 21 of the inorganic fiber mat-like product 200, the one end portion 21 and the other end portion 22 of the inorganic fiber mat-like product 200 are arranged to face each other to form the holding seal body 2. To do.
[0034]
This is described in detail below.
First, the shapes, dimensions, materials, etc. of the main components used when manufacturing the exhaust gas purifying catalytic converter 10 will be described.
As the catalyst carrier 1, a honeycomb cordierite monolith having an outer diameter of 130 mm and a length of 100 mm was used. The catalyst carrier 1 is provided with a number of square holes 111 along the axial direction thereof. A large number of honeycomb walls 112 serving as partition walls are formed between the square holes 111, and the wall thickness of the honeycomb walls 112 is 50 μm (see FIG. 2).
[0035]
For the shell 95, a SUS409 metal cylinder formed in a cylindrical shape was used. The shell 95 has an outer diameter of 141 mm and a plate thickness of 1.5 mm.
The inorganic fiber mat 200 has a thickness of 8 mm and a bulk density of 0.2 g / cm. ^Three The crystalline alumina fiber was used. In addition, the inorganic fiber mat-like product 200 before the cutting has a length L. This length L is longer than the outer peripheral length R of the catalyst carrier 1.
The catalyst solution 70 used was a solution containing platinum and palladium.
[0036]
Next, a method for manufacturing the exhaust gas purifying catalytic converter 10 will be described.
First, as shown in FIG. 1 (A), the inorganic fiber mat 200 having a length longer than the outer circumference of the catalyst carrier 1 is prepared. Then, both end portions 21 and 22 are shaped so that one end portion 21 of the inorganic fiber mat-like product 200 is fitted to the other end portion 22. That is, one end portion 21 is cut so that the middle portion in the width direction of the inorganic fiber mat-like product 200 is convex to form a convex portion 211. Further, the other end portion 22 is cut so that the middle portion in the width direction of the inorganic fiber mat-like material 200 is concave, and a concave portion 221 having a shape that fits the convex portion 211 is formed.
[0037]
Next, as shown in FIGS. 1B and 1C, a catalyst carrier 1 that does not yet carry a catalyst component is placed on the inorganic fiber mat 200, and the catalyst carrier 1 is inorganic. The fiber mat 200 is wound once. At this time, the end 21 overlaps the end 22 of the inorganic fiber mat-like material 200. That is, at this time, an excess portion 23 is formed in the longitudinal direction of the inorganic fiber mat-like material 200 due to this overlap. Then, the surplus portion 23 is cut along a dotted line 29.
[0038]
Next, as shown in FIG. 1D, the cut-out convex portion 211 is fitted into the concave portion 221, that is, the end surface of one end portion 21 and the end surface of the other end portion 22 are opposed to each other. The fiber mat 200 is placed on the outer periphery of the catalyst carrier 1. In this way, the holding seal body 2 is formed.
[0039]
Next, the holding seal body 2 is fixed to the catalyst carrier 1 with a fixing tool such as a tape or an adhesive to make an integrated product 20. At this time, the alignment gap C formed between one end 21 and the other end 22 was 0 to 0.5 mm (see FIG. 3).
[0040]
Next, as shown in FIG. 2, the integrated product 20 is press-fitted into the shell 95.
Then, in the same manner as shown in FIG. 8 described above, preparations for supporting the catalyst component on the catalyst carrier 1 are made. That is, the press-fitted shell 95 is vertically arranged, and the pipe 71 is pressed against the lower end surface of the catalyst carrier 1 inside the integrated product 20 and the pipe 72 is pressed against the upper end surface of the catalyst carrier 1. Then, the slurry-like catalyst solution 70 is supplied from above the pipe 72 into the catalyst carrier 1 along its axial direction. Thus, the catalyst solution 70 is infiltrated into the catalyst carrier 1.
[0041]
Next, the catalyst carrier 1 is dried, and then a baking step is performed, so that the catalyst components are supported on the numerous honeycomb walls 112 in the catalyst carrier 1. In this baking process, the organic components contained in the holding seal body 2 can be burned out.
As shown in FIG. 3, the exhaust gas purifying catalytic converter 10 is thus completed.
Then, as shown in FIG. 4, after the pipes 71 and 72 are removed, the inlet side connecting portion 97 and the outlet side connecting portion 98 are connected to the ends of the shell 95, and welding is performed on these connecting portions. Integrate. The exhaust gas purification catalytic converter 10 is disposed in the middle of the exhaust pipe 99 of the automobile engine E.
[0042]
Of course, the excess portion 23 formed when the inorganic fiber mat-like material 200 is wound around the catalyst carrier 1 may be formed only in the convex portion 211 or only in the end portions 212 on both sides of the convex portion 211 ( (See FIGS. 1A and 1B).
Further, in this example, the end portion 21 side having the convex portion 211 is the surplus portion 23, but the end portion 22 side having the concave portion 221 may naturally be the surplus portion 23.
Further, when supplying the catalyst solution 70 to the catalyst carrier 1, only the pipe 71 is used and is pressed against the lower end surface of the catalyst carrier 1, and the slurry-like catalyst solution 70 is placed in the catalyst carrier 1 from below the pipe 71. May be supplied along the axial direction.
[0043]
Next, the effect of this example will be described.
In this example, after the inorganic fiber mat 200 is aligned with the actual catalyst carrier 1 having a dimensional error, the surplus portion 23 in the inorganic fiber mat 200 is cut. Therefore, the inorganic fiber mat-like product 200 can be cut into any length that is actually required for the holding seal body 2. Therefore, it is possible to almost eliminate the gap C formed between the one end 21 and the other end 22 of the holding seal body 2.
[0044]
Therefore, when the catalyst solution 70 is supported on the catalyst carrier 1, the catalyst solution 70 does not leak out from the fitting gap C to the shell 95 side. Therefore, the noble metal contained as a catalyst component in the catalyst solution 70 can be supported on the catalyst carrier 1 without being wasted.
Therefore, the catalyst solution 70 does not leak and adhere to the shell 95. Therefore, there is no inconvenience when welding the inlet side connecting portion 97 or the outlet side connecting portion 98 to each end of the shell 95.
[0045]
Here, the allowable width for the alignment gap C is considered as follows.
That is, the inorganic fiber mat-like product 200 is fixed to the catalyst carrier 1 with a fixing tool such as a tape or an adhesive after the excess portion 23 is cut, thereby obtaining an integrated product 20. Next, the integrated product 20 is press-fitted into the shell 95. Then, as described above, the catalyst solution 70 is supplied to the catalyst carrier 1, and the width within the range in which the catalyst solution 70 does not leak to the shell 95 side is considered as the width allowed for the alignment gap C. And it turned out that a leak can be prevented reliably if the width | variety of this alignment gap C is 1 mm or less.
[0046]
Note that the cutting of the inorganic fiber mat-like material 200 may be performed by cutting the surplus portion 23 while aligning the inorganic fiber mat-like material 200 with the catalyst carrier 1. Further, when the inorganic fiber mat-like material 200 is combined with the catalyst carrier 1, the length of the surplus portion 23 may be measured, and cutting may be performed by the length.
[0047]
Embodiment 2
In this example, as shown in FIG. 5, when the alignment gap C exceeds 1 mm, the alignment gap C is filled with a filling sheet 3 made of the same material as the inorganic fiber mat-like material 200, and the holding seal is used. The body 2 is formed.
Further, when performing the above-described winding arrangement, an inorganic fiber mat 200 that is shorter than the outer peripheral length of the catalyst carrier 1 is wound around the catalyst carrier 1. Specifically, the alignment gap C was 5 mm. Others are the same as in the first embodiment.
[0048]
In this example, the filling gap 3 which is a member different from the inorganic fiber mat-like material 200 is filled in the fitting gap C, and the width of the fitting gap C is set to 1 mm or less. Therefore, the alignment gap C can be almost eliminated. Therefore, also in this example, when the catalyst solution 70 is supplied to the catalyst carrier 1, the catalyst solution 70 does not leak from the fitting gap C of the holding seal body 2.
In addition, the same effects as those of the first embodiment can be obtained.
[0049]
Embodiment 3
In this example, as shown in FIGS. 6 (A) to 6 (C), when performing the winding arrangement, both ends of the inorganic fiber mat-like product 200 are inclined with respect to the thickness direction. The formed oblique ends 24 and 25 are used.
That is, as shown in FIG. 6A, one oblique end portion 24 and the other oblique end portion 25 are substantially in the thickness direction in a state where the inorganic fiber mat-like material 200 is spread in a planar shape. It is formed in a parallel oblique shape. One oblique end 24 has a convex portion 241, and the other oblique end 25 has a concave portion 251.
[0050]
Then, as shown in FIGS. 6B and 6C, when the winding arrangement is performed, the oblique end portion 24 is positioned on the outer periphery of the other oblique end portion 25 and is oblique. The inclined surface 242 at the end portion 24 is disposed so as to overlap the inclined surface 252 at the inclined end portion 25. In this way, the inorganic fiber mat-like material 200 is wound around the catalyst carrier 1 to form the holding seal body 2. Others are the same as in the first embodiment.
[0051]
In this example, one inclined end 24 is intentionally overlapped with the other inclined end 25 so that the above-mentioned alignment gap C is not formed. At this time, when the outer peripheral length of the inorganic fiber mat-like product 200 after the winding arrangement is slightly longer than the actual outer peripheral length of the catalyst carrier 1, it protrudes from the surface of the holding seal body 2 due to the overlap. A shaped part 260 is formed. However, the convex portion 260 can be squeezed by the shell 95 and fit into the shell 95 when press-fitting into the shell 95.
[0052]
That is, the thickness of the convex portion 260 is smaller than the thickness of the inorganic fiber mat-like material 200. Therefore, even if the overlap is intentionally made, the holding seal body 2 can be accommodated in the shell 95 and the above-mentioned alignment gap C can be eliminated. Therefore, also in this example, when the catalyst solution 70 is supplied to the catalyst carrier 1, the catalyst solution 70 does not leak from the fitting gap C of the holding seal body 2.
In addition, the same effects as those of the first embodiment can be obtained.
[0053]
In this example, the oblique end portions 24 and 25 are formed in advance before the winding arrangement. However, either one or both of the oblique ends 24 and 25 are formed when the inorganic fiber mat 200 is wound around the catalyst carrier 1 in the same manner as described in the first embodiment. 200 may be cut and formed.
[0054]
Obviously, the oblique ends 24 and 25 may be formed in an oblique shape opposite to the present example with respect to the thickness direction. At this time, the inclined end 25 is positioned on the outer periphery of the inclined end 24, and the inclined surface 252 in the inclined end 25 overlaps the inclined surface 242 in the inclined end 24. Is done.
Further, either one of the oblique end portions 24 and 25 may be formed in a right-angled shape as in the first embodiment.
[0055]
【The invention's effect】
According to the present invention, it is possible to provide an exhaust gas purifying catalytic converter capable of supporting a catalyst component on a catalyst carrier without leakage of the catalyst solution from the gap between the holding seal bodies when the catalyst solution is supplied to the catalyst carrier. it can.
[Brief description of the drawings]
1A and 1B are views showing a method for forming a holding seal body in Embodiment 1, wherein FIG. 1A is a perspective view showing an inorganic fiber mat before winding, and FIG. 1B is a diagram showing an inorganic fiber mat. The perspective view which shows the state wound around the catalyst support | carrier, (C) The explanatory view which shows the state which cut | disconnects the excess part made to the inorganic fiber mat-like thing, (D) The perspective view which shows the state which formed the holding seal body.
FIG. 2 is a perspective view showing a state in which an integrated product in which a holding seal body is fixed to a catalyst carrier in the first embodiment is press-fitted into a shell.
FIG. 3 is an explanatory view showing an exhaust gas purifying catalytic converter in Embodiment 1;
4 is an explanatory view showing a state in which an exhaust gas purifying catalytic converter is arranged in the middle of an exhaust pipe of an engine in Embodiment 1. FIG.
5 is an explanatory view showing an exhaust gas purifying catalytic converter in Embodiment 2. FIG.
6A and 6B are diagrams showing a method for forming a holding seal body in Embodiment 3, wherein FIG. 6A is a perspective view showing an inorganic fiber mat before winding, and FIG. 6B is a diagram showing an inorganic fiber mat. The perspective view which shows the state wound around the catalyst support | carrier, (C) The perspective view which shows the state which formed the holding seal body.
7A and 7B are diagrams showing a method of forming a holding seal body in a conventional example, (A) a perspective view showing an inorganic fiber mat-like material before winding, and (B) a state in which the holding seal body is formed. FIG.
FIG. 8 is an explanatory diagram showing a method of supplying a catalyst solution to an exhaust gas purifying catalytic converter in a conventional example.
FIG. 9 is an explanatory view showing a catalytic converter for exhaust gas purification in a conventional example.
[Explanation of symbols]
1. . . Catalyst carrier,
10. . . Exhaust gas catalytic converter,
2. . . Holding seal body,
21,22. . . edge,
23. . . Surplus part,
200. . . Inorganic fiber mat,
95. . . shell,

Claims (2)

A catalyst carrier, a shell that covers the outside of the catalyst carrier, and a holding member that is disposed between the shell and the catalyst carrier and formed by winding an inorganic fiber mat around the periphery of the catalyst carrier. In an exhaust gas purifying catalytic converter having a seal body,
When performing the winding arrangement, the inorganic fiber mat-like material longer than the outer peripheral length of the catalyst carrier is wound around the catalyst carrier, and after cutting at least one end of the inorganic fiber mat-like material, An exhaust gas purifying catalytic converter, wherein the holding seal body is formed by opposingly arranging both ends of the inorganic fiber mat-like material.   2. The exhaust gas purifying catalytic converter according to claim 1, wherein the width of the alignment gap formed between both ends of the holding seal body is 1 mm or less.

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