JPH0541782Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a supporting body for an exhaust gas purification device. That is, the present invention relates to a supporting body to which a catalyst is attached in a catalytic converter or the like that purifies exhaust gas from an automobile engine or the like.

"Prior Art" A honeycomb structure is generally used as such a supporting matrix.

Conventionally, this type of honeycomb structure to which a catalyst is attached has been made of a strip of metal foil or the like.
A roll-shaped product is used in which a set of corrugated sheet material and a flat sheet material is made, and one set is bundled and wrapped with their ends aligned, and the corrugated sheet material and flat sheet material are joined via a brazing material. There is.

"Problems to be Solved by the Invention" By the way, the following problems have been pointed out in the support matrix using such a conventional honeycomb structure.

First, when forming a honeycomb structure for a particularly large carrier, it is necessary to
A set of corrugated sheet material and flat sheet material are layered and repeatedly wrapped in multiple layers many times. In the winding stage, the winding force is directly and concentratedly applied to the thin corrugated sheet material.
There were many cases where the corrugated sheet material was significantly deformed. As a result, the molded honeycomb structure also deforms, and it has been pointed out that there are problems such as difficulty in molding a perfectly circular structure.

Second, when forming a honeycomb structure for a particularly large supporting body, as described above, a set of corrugated sheet material and a flat sheet material are stacked one on top of the other, each with a brazing filler metal interposed therebetween, and repeated over multiple layers. It can also be wrapped around. Therefore, it is necessary to use particularly long strip-shaped corrugated sheet materials and flat sheet materials, and during molding, such long corrugated sheet materials and flat sheet materials are positioned so as to be overlapped with one end aligned.

However, it is not easy to superimpose and position the long corrugated sheet material and the flat sheet material with high precision, using a brazing filler metal for joining each piece, and this has been a problem. Furthermore, even if the sheets are superimposed with high precision, the superposition positioning often goes awry in the next winding stage, which has been a problem.

Thirdly, the forming of such a honeycomb structure is
The process is divided into the following stages: cutting, stacking, and winding corrugated and flat sheets. and,
In the winding stage where a set of corrugated sheet material and flat sheet material are bundled and wound, if the winding force is too strong and the winding is too tight, the honeycomb structure will become too small than expected; There was a problem in that if the honeycomb structure was wrapped too much, the honeycomb structure would become larger than expected.

In other words, various sizes and
A conventional honeycomb structure is formed by wrapping a set of corrugated sheet material and flat sheet material many times over multiple layers, each using a brazing material for joining. Therefore, depending on the delicate winding conditions such as the strength of the winding force,
There were many cases where it was not possible to obtain a honeycomb structure of the expected size. As described above, there is a problem in that it is not possible to obtain a honeycomb structure, that is, a support matrix having exactly the same size and shape, and the products tend to vary.

According to the first, second, and third points above, in the case of a support matrix using a conventional honeycomb structure, in terms of quality,
There were various problems in terms of strength, manufacturing time, cost, etc.

Furthermore, in addition to these, the following problems have also been pointed out with regard to the support matrix using the conventional honeycomb structure. That is, exhaust gas from an automobile engine or the like passes through a carrier and is purified by reacting with the catalyst attached to the carrier, but the exhaust gas sent to the carrier via a pipe is purified. The flow velocity is different between the central part and the outer peripheral part, and generally the flow velocity is higher in the central part where there is less resistance. On the other hand, in the case of a conventional support matrix, the density is uniform between the central part and the outer peripheral part, and the pore area and surface area of the cells, that is, the cell density is uniform.

Now, since the exhaust gas passes through such a supporting body with a flow velocity higher in the center than in the outer circumference, a problem has been pointed out in the cleaning efficiency of the exhaust gas. . In other words, there is an imbalance in the cleaning of exhaust gas by the attached catalyst between the central part where the flow velocity is high and the outer peripheral part where the flow velocity is low, resulting in superiority and inferiority in the cleaning reaction. However, it was pointed out that the cleaning efficiency deteriorated.

In the conventional example, such a point was pointed out.

In view of these circumstances, the present invention has been developed to solve the problems of the conventional methods described above.The present invention is made by combining one set of corrugated sheet material and a plurality of flat sheet materials, one end of which is aligned, a fixed center, and bundled and wrapped. By using a honeycomb structure joined through a brazing material, firstly, there is less deformation of the corrugated sheet material, and secondly, the corrugated sheet material and the flat sheet material can be overlapped and positioned with high precision. Thirdly, it is an object of the present invention to propose a supporting body for an exhaust gas purification device that has no variation in size, shape, etc. or,
In the case of claim 2, the corrugated sheet material having a large waveform and the corrugated sheet material having a small waveform are further employed, and the lengths of the sets are made different, so that in addition to these, fourthly, the exhaust gas passing through the corrugated sheet material is It is an object of the present invention to also propose a supporting body for an exhaust gas purification device that can make the gas flow velocity uniform between the central portion and the outer peripheral portion.

"Means for solving the problem" The technical means of the present invention to achieve this purpose are as follows. First, claim 1 is as follows. In other words, the supporting body for this exhaust gas purification device consists of a set of a corrugated sheet material in which wave-like unevenness is continuously bent and formed in a band-like shape, and a flat sheet material that is flat in the form of a band. The corrugated sheet material and the flat sheet material are aligned and overlapped at a time, and are bundled and wound in the same direction around one end as a fixed center, and each set and each set are adjacent to each other, and the corrugated sheet material and the flat sheet material are Each of them has a roll shape that is joined through a brazing material, and has a honeycomb structure to which a catalyst is attached. Next, regarding claim 2, it is as follows. That is, in the supporting body for an exhaust gas purifying device according to claim 2, the corrugated sheet material is a corrugated sheet material having a large wave shape with a large wave height and pitch. A small corrugated sheet material having a small wave height and pitch is used, and the length of the pair of the large corrugated sheet material and the flat sheet material is equal to the length of the pair of the small corrugated corrugated sheet material and the flat sheet material. It is set longer than the length. Then, these multiple sets are bundled with their ends aligned and wound together to form a joined roll.In the central part, each set is wound in layers, while on the outer periphery, each set is wound in a layer. Only the set of the large corrugated corrugated plate and the flat plate material is wound.

"Function" Since the supporting body for the exhaust gas purification device according to the present invention is constituted by such means, it functions as follows.

This supporting body consists of a set of corrugated sheet material and a flat sheet material, and these multiple sets are bundled and wound with one end aligned and set at a certain center, and each corrugated sheet material and flat sheet material are joined via a brazing material. In addition, it has a honeycomb structure.

Therefore, firstly, when forming a honeycomb structure,
The winding force in the winding stage is applied to the corrugated sheet material of each layer of the plurality of sets in a distributed manner. As a result, the corrugated sheet material undergoes little deformation, and, for example, it is easy to form a perfectly circular honeycomb structure.

Second, since multiple sets can be wrapped around each other,
The corrugated plate material and flat plate material used are significantly shorter than those in conventional examples of this type. Therefore, when forming a honeycomb structure, the short corrugated plates and the flat plates can be positioned with their ends very easily aligned and overlapped with high precision, even through the use of a brazing filler metal for joining. or,
Such misalignment of positioning during the winding stage is also prevented.

Thirdly, since multiple sets can be wrapped,
Corrugated sheet materials and flat sheet materials have a small number of windings. Therefore, even if a brazing filler metal is used for joining, a honeycomb structure having exactly the same size and shape can be obtained without being affected by delicate winding conditions such as the strength of the winding force.

Note that the above-mentioned first, second, and third points are particularly noticeable in a honeycomb structure having a large supporting body.

Further, in the supporting body for an exhaust gas purification device according to claim 2, the corrugated sheet material having a large waveform and the corrugated sheet material having a small corrugation are further employed, and the set of the corrugated sheet material having a large waveform is set to be longer. On the central part of the roll, each set is wound in layers and the cell density is high, while on the outer periphery, only sets of large corrugated sheets are wound. Cell density is becoming smaller.

On the other hand, the flow velocity of the exhaust gas sent through the pipe is higher at the center than at the outer circumference, but with such a supporting body, the flow velocity can be reduced.
By making the exhaust gas uniform between the central part and the outer peripheral part, the exhaust gas can be cleaned uniformly, and the cleaning efficiency can be improved.

"Embodiments" The present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 1 is a front view showing an embodiment of the present invention. FIG. 2 is a front view showing the molding stage.

First, its configuration etc. will be explained.

The honeycomb structure to which the supported catalyst is attached has the following structure. That is, a corrugated sheet material 1 in which band-shaped wave-shaped unevenness is continuously bent and formed.
and the belt-shaped flat plate material 2 are set as one set A, and these plural sets A ₁ , A ₂ , A ₃ , A ₄ have one end B ₁ , B ₂ ,
B ₃ and B ₄ can be aligned and overlapped at once, and
B ₁ , B ₂ , B ₃ , and B ₄ at one end are set as one fixed center, and the wires are bundled and wound in the same direction to form a roll shape.

That is, to explain these in detail, the corrugated sheet material 1 is formed by corrugating metal foil or the like using a corrugator or the like to bend it in a predetermined manner. Similar metal foil or the like is used for the flat plate material 2 as well. When forming a honeycomb structure, first, in this illustrated example, a corrugated sheet material 1 and a flat sheet material 2 of a certain size, cut to the same length, are made into a set A with a brazing material (not shown) in between. , these appropriately plural sets A ₁ , A ₂ , A ₃ , A ₄ , that is, four sets in the illustrated example, align one end of each of them B ₁ , B ₂ , B ₃ , B ₄ as shown in FIG. 2, and, They are positioned one on top of the other at one time via a brazing material (not shown).

Then, these multiple sets A ₁ , A ₂ , A ₃ , A ₄ are
Align each end B ₁ , B ₂ , B ₃ , B ₄ at a fixed center, and bundle each end B ₁ , B ₂ , B ₃ , B ₄ at a predetermined center with each end B 1 , B 2 , B 3 , B 4 set at a common fixed center By applying a winding force, each layer is wound several times in the same common direction to form a perfectly circular shape when viewed from the front, as shown in FIG. The outer sides of the crests and troughs of each wave of the corrugated sheet material 1 are respectively joined to the flat sheet material 2 by pressurizing and heating an interposed brazing filler metal (not shown).

In this way, each space of the corrugated sheet material 1 is connected to the flat sheet material 2.
By dividing the cells 3 into independent spaces, a honeycomb structure which is a planar assembly of hollow columnar cells 3 is formed. The corrugated sheet material 1 and the flat sheet material 2 constitute the respective cell walls, to which the catalyst is attached. The supporting body is a case (not shown) which is a substantially cylindrical outer frame for supporting such a honeycomb structure.
It is used by inserting it inside.

The above is the explanation of the configuration, etc. The operation etc. will be explained below.

Exhaust gas from an automobile engine or the like passes through a cleaning device and is purified by reacting with a catalyst attached to the carrier. That is, the exhaust gas is purified by passing through each cell 3 of the honeycomb structure of the support base and reacting with the catalyst attached to the corrugated sheet material 1 and the flat sheet material 2 that constitute the cell walls.

Now, this honeycomb structure consists of corrugated sheet material 1
and the flat plate material 2 are set as one set A, and these plural sets A ₁ ,
A ₂ , A ₃ , and A ₄ are simultaneously bundled and wrapped with one end B ₁ , B ₂ , B ₃ , and B ₄ aligned and set at a constant center,
They are joined by an interposed brazing filler metal (not shown).

Therefore, the supporting bodies provided with this honeycomb structure are as follows: first, second, and third.

First, when forming a honeycomb structure, the winding force at the winding stage is determined by a plurality of sets A ₁ ,
It is dispersed and added to the corrugated sheet material 1 of each layer A ₂ , A ₃ , and A ₄ . In other words, it is possible to avoid direct and intensive application as in the prior art example of this type described above. As a result, the thin corrugated sheet material 1 undergoes little deformation, and the honeycomb structure has extremely high roundness.

Second, since a plurality of sets A ₁ , A ₂ , A ₃ , and A ₄ are wound, short corrugated sheets 1 and flat sheets 2 are used. In other words, as in the prior art example of this kind described above, a single long piece is not used with a brazing filler metal in between, but shorter pieces are used as the corrugated plate material 1 and the flat plate material 2. Therefore, when forming a honeycomb structure, the short corrugated plate material 1 and the flat plate material 2 can be positioned very easily with their ends aligned and superimposed with high precision, even through the use of a brazing filler metal for joining. Moreover, such positioning errors are also prevented in the next winding step.

Thirdly, since the plurality of sets A ₁ , A ₂ , A ₃ and A ₄ are wound, the number of times the corrugated sheet material 1 and the flat sheet material 2 are wound is small. In other words, the number of windings of the corrugated sheet material 1 and the flat sheet material 2 can be increased without having to wrap each long sheet over and over again in multiple layers with the soldering filler metal in between, as in the conventional example of this type described above. Fewer. Therefore, it is difficult to be influenced by delicate winding conditions such as strength of winding force, etc., and a honeycomb structure of exactly the same size can be obtained without being influenced by such factors.

Note that the above-mentioned first, second, and third points are particularly noticeable in a honeycomb structure having a large supporting body. The above is the explanation of the operation, etc.

"Other Embodiments" FIG. 3 is a front view showing another embodiment of the present invention.

In the embodiment shown in FIG. 3, unlike the embodiment shown in FIG _. A combination of corrugated sheet materials 1 ₂ with a fine waveform, that is, a small wave height and pitch, is used. Then, the set C of the large corrugated corrugated plate material 1 ₁ and the flat plate material 2 is divided into two sets C ₁ , C ₂ ,
Also, a set C of small corrugated corrugated plate material 1 ₂ and flat plate material 2 is
Four sets of C ₃ , C ₄ , C ₅ , and C ₆ are used, two sets each.
In addition, _two sets of large corrugated corrugated sheet materials were used.
Four sets of C ₃ , C ₄ , C 5 , and C 6 are set, in which C 1 and C ₂ have long lengths and small corrugated corrugated sheet materials 1 ₂ are used, and C 3 , C ₄ , C ₅ , and C ₆ have shorter lengths.

Then, six such pairs C ₁ , C ₂ , C ₃ , C ₄ , C ₅ ,
C ₆ is made by aligning each end D ₁ , D ₂ , D ₃ , D ₄ , D ₅ , D ₆ and bundling them together in the order of, for example, C ₂ , C ₅ , C ₆ , C ₁ , C ₃ , and C ₄ . It is wound around to form a roll-shaped honeycomb structure. Therefore, in this honeycomb structure, in the central part, there are 6 pairs C ₁ , C ₂ , C ₃ , C ₄ ,
C ₅ and C ₆ are wound in layers, and from the middle to the outer periphery, only two sets of C ₁ and C ₂ are wound.

The embodiment of FIG. 3 is constructed in this way. So it becomes as follows.

That is, this honeycomb structure is a combination of a large corrugated sheet material 1 ₁ and a small finely corrugated corrugated sheet material 1 ₂ , and the central part side and the outer peripheral part side of the corrugated sheet material 1 1 are combined.
The pore area and surface area of the carrier, that is, the density of the cells 3, are gradually and freely changed. In other words, the cell 3 density is high at the center of the roll, while the cell 3 density is high at the outer periphery of the roll.
The density is getting smaller.

By the way, the exhaust gas sent through the pipe is
The flow velocity differs between the central part and the outer peripheral part, and the flow velocity on the central part is higher. On the other hand, in the case of a supporting matrix using this honeycomb structure, the density of the cells 3 on the center side is large and the density of the cells 3 on the outer periphery side is small. By adjusting the cell 3 density to correspond to the difference in the flow rate of exhaust gas, and by setting each cell 3 density in detail, it is possible to freely create a hole area suitable for such exhaust gas. You will get it.

In this way, the flow velocity of the exhaust gas passing through the supporting body can be made uniform between the central part and the outer circumferential part, and as a result, the exhaust gas can be uniformly cleaned by the attached catalyst. Cleaning efficiency can be improved.

First of all, other embodiments are also possible, such as the following. That is, the corrugated sheet material 1 and the flat sheet material 2 are
Unlike the embodiments shown in FIGS. 1 and 3, the corrugated sheet material 1 is not completely wound, but is slightly wound approximately in a spiral shape, and the corrugated sheet material 1 is a large corrugated sheet material ₁ similar to the example shown in FIG.
and corrugated sheet materials 1 ₂ with small corrugations are used alternately, and furthermore, for each corrugated sheet material 1 ₁ and 1 ₂ , the corrugations on the center side of the honeycomb structure are small and dense, and the corrugations on the outer peripheral side are larger and sparse. Other embodiments are also possible.

Other embodiments constructed in this manner also have the same advantages as the embodiment shown in FIG. 3 described above. In other words, the area of the pores serving as a carrier can be freely set between the central portion and the outer peripheral portion, thereby improving the cleaning efficiency of exhaust gas.

Second, in the above-described embodiment shown in FIG. 3 and other embodiments, the configuration, function, operation, etc. of each other component are similar to those explained in the above-described embodiment shown in FIG. is omitted.

Thirdly, in the honeycomb structure of the present invention, various other shapes and combinations of waves of the corrugated sheet material 1 are conceivable.
The number of sets of and the flat plate material 2 and their wrapping method are also as follows:
Various other options are possible.

"Effects of the Invention" As explained above, the support base for an exhaust gas purification device according to the present invention includes a plurality of sets of corrugated sheet materials and flat sheet materials, which are bundled and wound around a constant center with one end aligned, and a brazing material Since it uses a honeycomb structure joined via

First, in this honeycomb structure, there is little deformation of the corrugated sheet material, and for example, it is easy to form a material with extremely high roundness.

Secondly, this honeycomb structure is formed in such a way that the corrugated sheet material and the flat sheet material are easily superimposed and positioned with high precision, and the positioning is not disturbed by winding.

Thirdly, it is not affected by delicate winding conditions, etc.
Since honeycomb structures having exactly the same size and shape can be obtained, product variations are prevented.

According to the first, second, and third aspects mentioned above, the supporting matrix of the present invention has stable quality, excellent strength such as rigidity, shortened manufacturing time, and excellent cost.

Furthermore, the supporting body for an exhaust gas purification device according to claim 2 further employs a corrugated sheet material having a large waveform and a corrugated sheet material having a small waveform, and by making the lengths of the sets of the corrugated sheets different, the following is achieved. be effective.

That is, in addition to the above, fourthly, it is possible to make the flow velocity of the passing exhaust gas uniform between the central portion and the outer peripheral portion. Therefore, cleaning of the exhaust gas by the attached catalyst is realized uniformly without any imbalance or superiority, thereby improving the cleaning efficiency of the exhaust gas. In this way, the problems that existed in this type of conventional example are completely eliminated, and the effects it brings are remarkable and great.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of a supporting body for an exhaust gas purification device according to the present invention. FIG. 2 is a front view showing the molding stage. FIG. 3 is a front view showing another embodiment of the present invention. 1, _{1 1} , 1 ₂ ... corrugated sheet material, 2 ... flat sheet material, 3 ...
...cell, A...set, _A1 , _A2 , _A3 , _A4 ...multiple sets, _B1 , _B2 , _B3 , _B4 ...one end, C...set, _C1 ,
C ₂ , C ₃ , C ₄ , C ₅ , C ₆ ... multiple sets, D ₁ , D ₂ , D ₃ ,
D ₄ , D ₅ , D ₆ ... one end.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A set of a corrugated sheet material in which a band-shaped corrugated unevenness is continuously bent and a flat sheet material in a band-like shape,
A plurality of these sets are overlapped at once with their ends aligned, and are bundled around one end as a fixed center and wound in the same direction, and each set and the adjacent waves between each set are 1. A supporting body for an exhaust gas purification device, characterized in that a plate material and a flat plate material are each joined through a brazing filler metal in the form of a roll, and have a honeycomb structure to which a catalyst is attached. (2) In the supporting body for an exhaust gas purification device according to claim 1, the corrugated plate material includes a large corrugated plate material with a large wave height and pitch, and a small corrugated plate material with a small wave height and pitch. A corrugated sheet material is used, and the length of the pair of the large corrugated corrugated sheet material and the flat sheet material is set longer than the length of the pair of the small corrugated corrugated sheet material and the flat sheet material, These multiple sets are bundled together with their ends aligned and wound to form a joined roll.In the central part, each set is wound in layers, while on the outer periphery, the large waveform A supporting body for an exhaust gas purification device, characterized in that only a set of a corrugated plate and the flat plate material is wound.