DE7401002U - Container for catalytic converter for controlling and monitoring exhaust emissions in internal combustion engines - Google Patents

Description

K c; · 'Ο s e

Dt '^; Oh

1 / au Münchfin-Pullach, January 8, 1974

TI SILENCER SERVICES LIMITED, Squires Gate Lane, Blac kpool . Lancashire, FY3 3RN, England

Container for catalytic converters for controlling and monitoring exhaust emissions in internal combustion engines 7, W

The invention relates to a container for catalytic converters for the control and monitoring of exhaust gas emissions in internal combustion engines and a method for their production. Such control and control of the exhaust emission is mainly in engines required by motor vehicles, but can also ^ ei other internal combustion engines are used.

It is known to enter the exhaust system of the internal combustion engine insert hollow cylindrical housing made of sheet metal similar to a silencer, but which has a porous substrate contains, on which a catalyst is deposited, which the oxidation or decomposition of harmful emissions in supports the exhaust gases.

At first glance it may seem simple, one in size and Form suitable substrate to be mounted in a suitable housing. However, this is far from the actual

gabenhoiten and os pose considerable problems in practice In particular, it is the fact that the substrate generally consists of ceramic material and that it is necessary

it must be protected against Schlöge and the like by which it could be broken. Furthermore, it cannot be rigidly arranged in the housing that the material is the substrate and the metal of the housing have a different thermal expansion * In addition, any assembly, arrangement, which allows a relative movement between the subotrat and the components by which it is held in place Difficulties due to the abrasion of the fragile material of the substrate. Another one worth striving for It is a feature that at least some degree of thermal insulation should be present around the catalytic converter To keep working temperature and to heat radiation to neighboring To reduce parts of the driving license.

Designs are already known in which all or some of these requirements should be taken into account. For example is in the German "Auslegeschrift AS 1 476 505 a device is described in which not the inlet and outlet sides of the substrate? Side surfaces enclosed in a frame made of gas-impermeable, heat-insulating layers and the resulting molded body is held on two sides by metal plates that hold it against one side of the housing surrounding the molded body using springs or screws or both. Such an arrangement conditional, however, that the substrate has a rectangular or square cross-section, which is disadvantageous for production and can create leakage problems as exhaust gases between adjacent corners of the heat insulating layers can pass through, which necessarily has some game

must have to cope with the different thermal expansion To take into account. That the inventors of the invention described in the above-mentioned DAS recognized these problems is apt to be their later German Auslsgesehrift AS 1 A.?Q fjo ?. in which a cylindrical housing is described, which frustoconical Has ends and includes a cylindrical substrate or element made of a porous ceramic material, which zv / ischen flanges is arranged in the housing. The cylindrical surface of the substrate is coated with a fibrous aluminum silicate cement coated to close the pores in the surface and to act as a protective cover or cushion to serve. The molded body produced in this way is then enclosed in a corrugated component, either from a corrugated one Sheet metal or, preferably, a corrugated fabric made of metal threads with knitted stitches that make the tight Fills the annular space between the molded body and the housing.

Obviously, however, this design could not solve all of the problems. The inventors of the two above mentioned German Exploitation documents have also recognized this, as it is of a later date in a German Offenlegungsschrift 2224679 it is admitted that there is still movement of the substrate with respect to the housing, possibly by rotation whose axis can occur, which lead to abrasion and subsequent damage. In this publication it is therefore proposed to provide an inwardly projecting tongue or projection on the housing to achieve this impede"

However, none of the known proposals has addressed the problem concerned with the assembly of the individual materials in the housing, especially when the housing is cylindrical and in one piece and if a knitted screen material or other compressive

Sible layer is provided between the substrate and housing is, it is almost impossible by known methods to ensure that the assembly is carried out in such a way that d. the compressible layer grips the substrate sufficiently, and that the layer is evenly distributed.

Attempts have already been made to fix the outer housing around the substrate and the compressible layer under a predetermined load and then on it weld the seam together and although this is possible and leads to an acceptable product, this process is inefficient and expensive. In addition, here- ' at the diameter of the substrate within the tolerance limits; also changes and it is consequently necessary to have a number of different sizes of the cone pieces at the ends or to provide the end plates and to select them according to the! Adjust the size of the housing. This again increases the | Manufacturing costs. Finally, this procedure is where the housing is wrapped around, applicable only to containers of round cross-section.

The invention is thus mainly based on the object of the fixed arrangement of the substrate with a certain To ensure the level of pressure which can be predetermined and which can be kept uniform in an economical manner under production conditions and which further is maintained over the entire life of the catalyst. Another object of the invention is to create a design through which assembly under production conditions is considerably easier.

According to the invention, this object is a container for catalysts for the control and monitoring of exhaust emissions

Internal combustion engines, in which a cylindrical substrate body, which carries the catalyst and is designed for an exhaust gas flow from one face to the other end face, on its cylindrical Surface in a compressible damping layer made of a refractory, metallic or other Verbunci material is included, essentially in that this damping layer is in turn in a one-piece or a multi-piece cylindrical jacket or sleeve with an open seam is included, which due to the open seam; is variable in scope and together around the damping gap; is pressed, the jacket or the sleeve in a cylin-; drical sheet metal housing fits.

The term "cylindrical" as used in the present specification is intended to be in its true and broad sense designate a shape that has any kind of arched cross-section, circular, elliptical, oval or nearly square or may be rectangular, but substantially the same Has cross section over its length.

The use of a mantole or a sleeve to enclose and compressing the drip layer enables the layer substantially uniformly over the entire surface of the substrate can be compressed while the substrate is inserted into the fixed diameter nozzle will.

The jacket or the Hulse is preferably made of sheet metal and may be integrally formed, whereby the Kanrten <simply overlap.

Preferably, according to a further optional feature, the Invention in the longitudinal direction; running ribs in the coat

or the sleeve or in the material of the housing to keep the main body of the jacket or sleeve spaced from the housing. This results in considerable additional thermal insulation to that provided by the damping layer. .-sht educated isolation. The ribs are a further Tferk- · sal UBT invention formed according to on NuI1 at one end to taper ί to facilitate the entry of the sheath or sleeve in the housing.

Preferably end rings are made of ceramic . made of refractory, metallic or composite material similar to the damping layer, provided at both ends of the housing, to fix the substrate in the axial direction and to hold it firmly without abrasion.

When manufacturing such containers for catalysts .Control and control of exhaust emissions in internal combustion engines becomes a cylindrical substrate carrying the catalyst in a compressible damping layer made of a ceramic refractory, metallic or composite material included, so that the layer encloses the cylindrical surface of the substrate, then the shaped body produced thereby placed in a cylindrical sleeve or jacket with an open seam, an external pressure on the sleeve or jacket applied »in order to contract this to the extent and thereby compress the compressible layer to a certain extent, after which then the resulting compressed assembly axially into a cylindrical sheet metal housing fixed scope / hessungen is inserted.

! Preferably, the for inserting the arrangement into the Gej housing required A3Cialkrü £ t on the sleeve or the jacket

upset. This represents an important advantage gained from the presence of the jacket or sleeve of the present invention is achieved by thereby protecting the substrate from damage and contamination during this process is protected during assembly.

j In the following the invention is based on in the drawings exemplary illustrated embodiments explain in more detail; tert. It shows:

Figure 1 shows a section through a container according to the invention for catalysts in one containing its axis!

FIG. 2 is a sectional view in a plane perpendicular to the axis;

Figure 3 is an isometric view illustrating an assembly step;

Figure 4 is a sketchy view showing a further Shows step in assembly;

Fig. 5 is a sketchy representation of a machine that is suitable for carrying out the assembly or manufacture and

FIG. 6 shows a further view of part of the circuit shown in FIG

illustrated machine in the view along its axis.

As can be seen from Figures 1 and 2, the container consists from an outer cylindrical housing circular transverse

sectional and frustoconical inlet and outlet caps 2 and 3 which terminate in cylindrical connecting portions. As already mentioned above, the housing does not have to be circular in cross section, but can be elliptical, oval or almost rectangular or square, but with at least slightly rounded corners. The housing 1 at the ver. illustrative embodiment is made of a dui budding sheet of stainless steel of 1.25 mm thickness, wel-; ches is rolled round and its meeting edges are connected to one another by a folded seam 4 (Figure 2). The inlet and outlet caps are identical except> that the inlet cap 2 transversely replaced by their interior having a to [sxreckende rod. This rod has a V-shaped! Cross-section, the tip of which is upstream and serves as a di- ° user to distribute the incoming stream of hot exhaust gases and thereby focus the dangers of erosion. To reduce or avoid the inlet area of the substrate carrying the catalyst.

The substrate is illustrated at 6. It consists of a cylindrical shaped body, which corresponds in cross section to the housing 1 and is of a known type, which consists of a porous Material consists of refractory ceramic. Also hif is like in known designs, the cylindrical surface is covered with a thin layer 7, which consists of a ρastenformigen refractory mobile material, such as a material, sold under the registered trademark "Fiberfax".

A damping layer 8 is provided surrounding the substrate 6, which consists of two layers of knitted metal drs & tnets available on the market, which are preferably made of stainless Steel wire is heard. Such metal nets are

for example under the registered trademark "Incoloy DS" expelled. This damping layer 8 is compact and porous and, due to its open structure, leads to a significant amount of confusion.

Surrounding the damping layer 8 is made of sheet metal standing jacket or sleeve 9 is provided, which is the main feature of the invention. In the illustrated execution For example, this shell or sleeve consists of two semi-cylindrical shells, the meeting of which © Canton is i overlap. A number of outwardly protruding ribs j or strips 10 are pressed into the shells and must be uniform sig spaced apart and extend parallel to the axis of the arrangement. The jacket 9 is made of stainless Sheet steel made of 0.75 mm thick (22 S.W.G.), Which means! the material is sufficiently rigid that there is no noticeable inncn-r has a resilient damping effect, in that the ribs do not yield to the loads that occur with such devices. " Due to the fact that the seams or overlaps between the shells of the jacket 9 are open, this can be. Extent freely change under the effect of externally applied loads and can therefore, although it is itself a considerable Rigid., A uniform and essentially uniform Apply pressure to the dampening layer 8.

If the jacket 9 is adapted to surround the layer 8 and then pressed together in order to compress the layer and thereby grip the substrate evenly and firmly, the resulting arrangement can be pushed axially into the housing 1. This is facilitated by the fact that the ribs are bevelled 10 at an end of the sheath, as is illustrated at 11 in Figure 1 to zero, ^ erni the jacket is located at its installation location, provide the Rip

-ΙΟΙ pen 10 only a line contact with the inside do> s Housing 1 ago, P ^ that a significant degree of thermal insulation ι is achieved. In a modified embodiment can the ribs inward, sr. of! GsMuse 1 te ribs instead of the outwardly directed ribs "IO" on the jacket 1, which would be the same as a result.

j I

Be 'In a further modification, the cushion layer migem refractory material or a composite material of feu-j erfesten ceramic and metallic materials may be selected from ¹ overall stricktem metal screen by a damping layer of faserför- replaced.

The substrate 6 is made axially by preformed end rings. X 12 Compressible material Fixed in place, this material is the same knitted metal screen as the damping layer 8. These end rings are in turn punched out of sheet metal Guide plates 13 held, each having a lip 14, which extends over the inside of the associated ring 12 and essentially prevents a ßtrömungsweg for the exhaust gases through the attenuators made of metal mesh. However, the lips 14 do not contact the substrate 6 itself.

To assemble the entire facility in manufacturing, a half of the jacket 9 is first placed in a clamping device. The substrate 6, which already has the impermeable; gene coating 7 and the surrounding dampening layer, is! put in this half and then the other half jte of the coat. This is indicated in FIG. 3. Alternatively, the damping layer can be split into two semi-cylindrical halves can be provided, one of which is inserted into the lower half of the jacket, whereupon the coated substrate and then the other

Half are placed, after which finally the second jacket section is applied.

The housing 1 can already have the metallic guide plate 15 and the damping end ring on one side with the end cap 3t 12 be provided. The arrangement described in the previous paragraph is pushed axially into the other end of the housing 1, with the beveled ends 11 of the ribs 10 entering first occur, as illustrated in Figure 4. To the introductory: To enable the arrangement, the jacket must be taken out; presses v / earth to compress the cushioning layer 8. It j it is obvious that the degree of compressive force applied for this purpose by carefully choosing the thickness of the damping part and the height of the ribs 10 in relation to the outside diameter of the substrate 6 and the diameter of the housing 1 can be set

can.

Then the other end ring 12 and the baffle 13 and the inlet cap 2 fitted. Preferably, however, the end ring 12 and the guide plate 13 are used to reduce the axial force to transfer, with which the assembly is inserted into the housing. For example, the guide plate and the end ring are mounted on a die at the free end of a pressure piston. which is used to deliver this power. It can be seen that this force is transmitted directly to the jacket 9 so that no appreciable axial breaking load is transmitted to the fragile material of the substrate.

In the illustrated embodiment, the element 6 has a diameter of 102.5 mm. The inside diameter of the Case 1 is 117.5 mm. The jacket 9 has ribs 10, which are 3 mm high. The damping layer 8 is uncompressed Condition 7 mm thick, so the maximum diameter

the arrangement enclosed by the sheath is approximately 1i3 mm prior to insertion. This diameter is made by compression reduced to 117.5 mm when inserted into the housing 1, the entire compression taking place in the layer 8, which is then only about 4 mm thick. Due to Art and in the way that the compression takes place by means of the jacket 9, the layer 8 grips the substrate 6 firmly and without abrasion or there is a risk of rupture and there is sufficient remaining compressive force to grip this handle under all heat conditions and mechanical impact loads that may occur.

It SOJ.I should be emphasized that the mantle itself is not radial is compressed to some noticeable extent, but only by overlapping its edges its circumference decreased. This makes it the damping layer and not the jacket, which compensates for manufacturing tolerances and maintains the grip on the substrate. The function of the coat lies in the fact that a uniform compressive force is applied to the damping layer, that the installation in the housing is facilitated and that the heat insulating air gap is formed will.

It should also be noted that during assembly the jacket only has the exact damping layer to squeeze the minimum amount necessary

in
to phase in / the housing. It shouldn't be too small

Value to be compressed and then to the resilient properties the cushioning layer can be trusted to be a dense one : and to ensure a vibration-free fit in the housing.

j Figures 5 and 6 show a device which is used for

guiding the mistake of introducing is suitable, whereby in this case the housing has an oval cross-section. The lower half of the jacket is turned into one by hand

through the lower halves of a pair of jaws working together = res 15 (cf. = Fig = β) placed-. This is followed by with The substrate provided with the damping layer and then the other half of the edge is placed accordingly. The top halves 16 of the jaws are then pivoted downwards by oppositely directed compressed air pistons 17 in order to To compress the order down to the desired final dimensions, whereupon an end ring and a baffle plate are fitted onto the end of a pressure piston 18 (FIG. 5) which is loaded by compressed air; is actuated to the end ring and the baffle for engagement with the provided with the jacket and biased by compression To bring arrangement and then slide it into a suitably arranged housing, which already contains the other end ring and the baffle and has an end cap 3.

The resulting assembly is then removed from the device and the remaining end cap in place welded at the same time with the associated guide plate 13

All of the technical details mentioned in the description and recognizable in the drawings are essential for the invention of importance c

Claims (1)

1. Container for catalytic converters to control and monitor exhaust emissions in internal combustion engines, with a cylindrical shaped body as a substrate, which carries the catalyst and for an exhaust gas flow formed from one end face to the other end face j is, which on its cylindrical surface in a compress! sitive damping layer made of a refractory, metallic or j composite cloth-like material and is further eingeschlos- in a cylindrical \ sheet metal housing with inlet and outlet ports sen ', characterized in that the damping \ mgs layer (8) in a one-piece or multi-piece casing or sleeve ( 9) enclosed with an open seam which _s is changeable due to the open seam in the Urcfang and the damping layer (8) surrounding compressed wherein the sheath or the sleeve fits into the sheet metal housing (1). 2. Container according to claim 1, characterized in that the jacket da3 or the sleeve (9) consists of sheet metal and has a pattern of outwardly pressed, axially extending ribs (10) » such that only a linear contact with the inside of the housing (1) is made. 3 »Container according to claim 1 or 2, characterized in that the jacket or the sleeve (9) consists of two semi-cylindrical halves. i | _t Container according to claim 2 or 3, characterized in that at one end of the shell (9), the ribs (10) to zero leadership I have chamfers (11). 5. Container according to one or more of claims 1 to 4, da- i characterized; that the substrate (6) axially through end rings' (12) Made of Komprossibaiem refractory, metallic or composite. .a.tofX-like material are kept. 6. Container according to one or more of the preceding claims, characterized in that the damping layer (8) consists of two Consists of layers of knitted metal wire mesh. 7. Container according to one or more of the preceding claims, characterized in that the opposite edges of the jacket or the sleeve (9) are arranged overlapping. 8. Container according to claim H, characterized in that the rip: pen (10) are pressed into the material of the jacket or the sleeve (8). 9. Container according to one or more of the preceding claims,> characterized in that the jacket or the sleeve (9) consists of i stainless steel sheet of 0.75 now thickness. 10. Container according to one or more of the preceding claims, characterized in that on the Gä "äuse (1) inwardly judiciary; Dead ribs are provided. 11. Container according to one or more of the preceding claims, characterized in that the damping ungs layer (8) made of refractory, fibrous material or a composite material of refractory ceramic and metallic materials bes ⁴ .nt.