JPH06510695A - Extended single block honeycomb body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Single block honeycomb body of suitable length The present invention relates to a monolithic honeycomb body, particularly for exhaust gas equipment in automobiles. It relates to a catalyst carrier advantageously used in catalytic converters.

A large number of passageways that are at least partially patterned and allow fluid to flow through them in the main flow direction. A number of honeycomb bodies of this type consisting of forming platelets are known in the prior art. ing. A typical FRa type of this type of honeycomb body is, for example, European Patent No. 2 It is described in No. 45737.

For example, International Patent Publication No. 91101178 and International Patent Publication No. 91101807 In the publication, a special means for influencing the flow inside the passages of this type of honeycomb body is described. It is also known to provide an auxiliary leading edge in the form of openings, flow guide surfaces or folds. It is being

Despite the fairly advanced development of this type of honeycomb body, honeycomb bodies have traditionally It consists of only a limited axial length, and its largest known structure is It has an axial length of approximately 152 mm.

For metal carriers (unlike ceramic carriers, which are difficult to manufacture), Both by the rolling mill and by the manufacturing technology, the subsequent coating process with catalytically active materials However, even though such limits are not or were not given in advance in principle, However, those skilled in the art will not be able to identify catalyst components that require a relatively large active capacity. In the case of catalysts, it is always possible to use a catalytic converter combined from several partial carriers. There is a bias that there is no point in adopting a relatively long honeycomb body because of the I was fascinated. The reasons for this bias are, in addition to doubts about manufacturing technology, An intermediate chamber between the two partial carriers allows for lateral mixing, 4If equilibrium and strain behavior. There is also a fortune telling that you will get good timing. This is a ceramic honeycomb body However, as the present invention makes clear, this is true for metals as a whole. It does not apply to manufactured honeycomb bodies. To date, at least the outer covering and/or Most distortion problems can be avoided by properly fixing the sheet metal layer to the electrical insulator of the covering. Indeed, a number of structural forms are known for which length restrictions are no longer necessary. .

According to the geometries developed to date for lateral mixing and for increasing catalytic activity: For another reason, it is not necessary to divide the catalytic active capacity into a large number of partial volumes v1.

Clearly, constructing a catalytic converter from multiple partial carriers requires only one fluorescent block. This method is much more time-consuming and expensive than the method of incorporating the exhaust gas system into the exhaust gas system. that Nevertheless, the second deficiency is that the desk is progressing towards the development of a honeycomb body of suitable length-1. Despite showing signs of suffering, he had been forced to do so for many years.

An uninvented problem is that large active capacities can be prepared without partitioning into partial carriers and Intermediate between partial carriers for vortex or lateral mixing, depending on the type of construction, if required Honeycomb is cost-effective as it eliminates the need for a chamber and can be assembled with little effort. The goal is to create a strong body.

To solve this problem, at least partially patterned Fluid is i! Consists of a sheet metal layer forming a large number of flow passages, 16 in the main flow direction. A single block having a length of 0 mm or more, preferably 170-200 mm. A square-shaped honeycomb body, sometimes with a catalyst support, this honeycomb body is small when viewed in the main flow direction. It has a vortex 'fJ-81 region at least in its central range. This kind of honeycomb body According to Arranged in series! The results are just as satisfactory as with the two partial carriers.

This arrangement saves the usual intermediate space of about 15-40 mm between the partial carriers. As a result, the overall structure is rather compact. Located in the central area of the honeycomb body. If necessary, the eddy current region created according to known methods can be used. As a result, the advantageous properties of the intermediate spaces between the partial carriers can be realized with very little effort during assembly. Ru. In that case, the vortex region does not have to be located exactly in the center of the honeycomb body; It may be shifted somewhat toward the front or back in the main flow direction.

Especially in the vortex region, it is described in International Patent Publication No. 91101807. An auxiliary leading edge is provided inside the passageway to ensure that the passageway is closed. Conventional techniques for this purpose Other forms of leading edges, such as those known in the art, can also be employed. However, the above wraparound , at least a part of the honeycomb body of the second species is made of corrugated sheet metal, and It is particularly advantageous when it is possible to easily add auxiliary folds to existing manufacturing processes. can be incorporated.

Swirls are not desired in all individual passages and lateral mixing is desired alternately or simultaneously. In the case of A frontage is provided to allow cross-mixing between the passages.

If intentional barrel mixing is desired, International Patent Application No. 91101178 According to the publication, auxiliary flow guide surfaces are also provided. All conventionally known structures The type and improvement can also be commonly adopted for the honeycomb body of "appropriate length" based on the present invention. Ru.

As will be explained in detail with reference to FIGS. 2 and 3, in the past, catalytic converters In contrast, there are a large number of honeycomb bodies of various dimensions. In that case, axial A very large number of pieces with the same length and diameter D (minimum diameter Dmin if the cross section is non-circular) Different ratios L/D are realized in relation to the diameter or Dmin. However, this Based on the above-mentioned bias of the manufacturer, the ratio L/D or L/Dmin is D or For Dmin, honeys such as those above the limit curves in Figures 2 and 3 The cam body is not systematically adopted, its limit curves are conventionally adopted in various diameters. corresponds to the longest construction type used, in this case always 152 mm. .

The drawings include examples of the present invention (the present invention is not limited thereto) and "appropriate" illustrations. Limit curves characterizing the length-1 prescription are shown. For more details, see Figure 1. Thus, a schematic cross-sectional view of a honeycomb body according to the invention with a vortex region, Figure 2 shows the line representing the limit curve for the optimum length -1 for a honeycomb body with a circular cross section. diagram, and In the third session, the ``limit to the appropriate length j'' of a honeycomb body with an oval or elliptical cross section is discussed. It is a diagram showing a curve.

The honeycomb body 1 in FIG. The sheet metal layer 3 is composed of a sheet metal layer 3 in which the fluid flows in the flow direction S. It is patterned to form a passageway 4 in which a w block can be formed. sheet metal pattern Although the style is not a problem for the present invention, it is advantageous to use smooth sheet metal and corrugated sheet metal. The first and second layers are made by overlapping sheet metal with various corrugated shapes. ing. The honeycomb body 1 has a length of at least 160 mm and is therefore conventionally The maximum structural form (see Figure 2 and the limit curve in Part 3) The length is also getting longer. It is preferably longer than 170mm, which is conventional This can only be realized with two partial carriers arranged in series with each other. the spot If the honeycomb body is It has a diameter of 90 to 130 mm. Oval or elliptical shapes with the same cross-sectional area A structural type can also be formed according to the invention. In order to fully obtain the properties of the two part carriers arranged, the present invention Based on (the honeycomb body influences pickling, at least in its central range, as described below) It is possible to have a vortex bed area 5 having one or more means for doing so.

ia, mixing in the individual sheet metal layers in the vortex region between mutually adjacent passages 4 An opening 6 is provided for this purpose. Advantageously formed as a fold of corrugated sheet metal An auxiliary leading edge 7 is also provided. connected to these openings and/or folds. The flow guide surface 8 that has been closed is also effective.

Figure 2 shows the limit curve for defining the concept of ``appropriate length'' for a honeycomb body with a circular cross section. ”0, and in that drawing, the diameter is on the X axis and the length is perpendicular to the Y axis. The ratio L/D to the radius is written. Limit curve 10 is conventionally mass-produced. corresponds to a honeycomb body with maximum ratio L/D, which has an axial length of 152 mm. Occurs in some cases. A larger ratio cannot be achieved conventionally, or It was technically meaningless and therefore was not considered.

FIG. 3 shows the course of limit curve 11 for an oblong or elliptical honeycomb body. All the explanations in Fig. 2 apply to this, except that the minimum diameter Dmin is used instead of diameter. Even for such a honeycomb body with a non-circular cross section, Conventionally, a large L/Dmin ratio could not be realized economically or due to technical To! It had not been given much thought.

Such a honeycomb body of appropriate length is composed of two partial carriers in its overall characteristics. It is not unlike a honeycomb body, and a single block is made up of two individual partial carriers. It is cost effective as many steps in handling, coating and fixing can be omitted. It can be advantageously integrated into the exhaust gas system. There are two advantages of the present invention, in which case At the same time, there are no disadvantages compared to known systems.

○ko Procedural amendment June 3, 1994 Patent F? Secretary-General's attack 1 Indication of incident Tokucho Hei 5-5043572 Name of invention Single block of appropriate length Honeycomb body 3'4 Person who corrects Relationship to the incident: Patent agent Address: De-5204 Lomar, 1 Haubtonjutler, Federal Republic of Germany Se 150 Name: Emittech Gesellschaft Fuyua Emitssion Technologie Benoylenkter Hafrang 4, Agent ■112 Address: 4-16-126 Otsuka, Bunkyo-ku, Tokyo Number of claims increased due to amendment none'! Subject of amendment: Claims column 8 of the specification Contents of amendment: See the attached sheet. cage The scope of the claims 1, at least partially patterned in the flow direction (S)! AC can flow through 1 gas in a self-portion consisting of a layer of sheet metal (3) forming a large number of J paths (4) In a honeycomb body for a single blonog type m catalyst carrier for purification, the honeycomb body (1) is 2, main stream having a length L) of 160mm 1J, preferably 170-200mm A vortex region (5) is provided at least in the central region when viewed from the direction (S). Claim 1 characterized in that the single block honeycomb (3. In particular, an auxiliary front tdk (7) is provided inside the passageway (4). A single block honeycomb (4, where a part of the sheet metal (3) is It is formed in the form of a wave, and the auxiliary leading edge (7) is formed by folding back the wave. A single block honeycomb according to claim 2 or 3, characterized in that 5. The vortex 7itSII area (5) is provided alternately with the horizontal mixing control area, or is it possible to do this at the same time? Also, 1. Some or all sheet metal layers are adjacent to each other in the area. characterized in that openings (6) are provided for lateral mixing between the passages (4). A single block honeycomb according to one of claims 1 to 4 (6, auxiliary flow Claim 2, characterized in that the sliding guide surface (8) promotes swirling and lateral mixing. Single block honeycomb raw material according to one of item 5.

7. In the honeycomb body (1) with a circular cross section, the ratio of the diameter (D) to the length L) ( D/L) is located above the limit curve (10) shown in Figure 2 with respect to Ll. A single block type hive according to one of claims 1 to 6, characterized in that: Nikam ( 8. In the honeycomb body (1) with an oval or elliptical cross section, the minimum diameter (Dmi The ratio (Dmin/L) between n) and length L) is shown in Figure 3 regarding length L). Limit - @ Place above (12)! Claims 1 or 2 are characterized in that A single block honeycomb body according to one of the above.

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Claims (8)

[Claims] 1. A polygon that is at least partially patterned and allows fluid to flow through it in the main flow direction (S). A single block-shaped honeycomb body (consisting of layers of sheet metal (3) forming a number of channels (4) 1), especially in the catalyst carrier, the honeycomb body (1) has a length of 160 mm or more, preferably 1 A single block type hutch characterized by having a length (L) of 70 to 200 mm. Nicum body (1). 2. A vortex region (5) is provided at least in its central region when viewed in the main flow direction (S). Single block honeycomb body (1) according to claim 1, characterized in that: . 3. An auxiliary leading edge (7) is provided inside the passageway (4) in the vortex region. Single block honeycomb body (1) according to claim 2, characterized in that: 4. A portion of the sheet metal (3) is formed into a corrugated shape, and an auxiliary leading edge (7) is formed by folding the corrugation. The single block according to claim 2 or 3, characterized in that it is formed by Lock-shaped honeycomb body (1). 5. The vortex regions (5) are provided alternately with the lateral mixing regions or serve as both of them at the same time. transversely between adjacent channels (4) in some or all sheet metal layers in the area Claim 1 characterized in that an opening (6) for mixing is provided. Single block honeycomb body (1) according to one of Items 4 to 4. 6. characterized in that an auxiliary flow guide surface (8) promotes swirling and lateral mixing Single block honeycomb body (1) according to one of claims 2 to 5. 7. In a honeycomb body (1) with a circular cross section, the ratio of diameter (D) to length (L) ( D/L) is located above the limit curve (10) shown in Figure 2 with respect to length (L). Single block honeycomb according to one of claims 1 to 6, characterized in that: Cam body (1). 8. In the honeycomb body (1) having an oval or elliptical cross section, the minimum diameter (Dmi The ratio (Dmin/L) between n) and length (L) is shown in Figure 3 with respect to length (L). Claims 1 to 6 characterized in that they are located above the limit curve (12). A single block honeycomb body according to one of the above.