Element with a honeycomb structure, coupled with the tubular casing only in some areas

 

(57) Abstract:

Element with a honeycomb structure can be used in the device catalytic conversion of exhaust gases in the EXHAUST system, in particular in the EXHAUST system of a heat engine, preferably an internal combustion engine with spark ignition. Element (2) with a honeycomb structure is surrounded by a smooth plot (8,9) sheet metal passing in the axial direction of the length of the element (2) with a honeycomb structure. Edges of the metal sheets of cellular element fitting within at least one smooth area. Sheet metal is an integral part of the element with a honeycomb structure and is located in the axial area between the element with a honeycomb structure and a tubular casing (1). In this axial zone eliminates unwanted solder element (2) with a honeycomb structure to the tubular casing (1) regardless of the method of soldering. 4 C.p. f-crystals, 7 Il.

The present invention relates to an element with a honeycomb structure for the passage of exhaust gases, which can be applied, in particular, in the device for catalytic conversion of exhaust gases in the EXHAUST system, especially in S="ptx2">

Element with a honeycomb structure made in the form adjacent to each other rolled or typed in the package at least partially structured metal sheets to form between their layers of flow channels through which the exhaust gases located in the tubular casing and soldered thereto in the axial direction on a portion of its length. Such an element with a honeycomb structure known from the application DE 2924592 A1. To connect this item with the tubular casing in DE 2924592 proposed, in particular, to immerse mounted in a tubular housing element of its end surfaces in the tub with the binder, resulting in the formation wetted areas. Then located on the end sides of the wetted zone through a sieve put a layer of solder coming from the drive with flux. After that, the element with a honeycomb structure coated with thus you solder layer to the tubular casing in a vacuum or in a protective gas atmosphere.

In addition, DE 2924592 proposed to immerse the end surface is installed in a tubular casing element in the molten solder.

From the application DE 4306052 A1 also known element with a honeycomb structure for the passage of exhaust ha is smooth and corrugated metal sheets, which folded into a roll to form between the layers of channels for the passage of gas. With smooth metal sheet is located outside. For reliable connection by soldering element with the tubular casing has a smooth metal sheet is made with a large number of holes, evenly spaced around the outer perimeter of the element. From WO 93/12904 known method of soldering the housing of the catalytic Converter of the EXHAUST gas. The solder applied on the metal sheet element with a honeycomb structure as follows: first, the flux with the corresponding grain size is dispersed in a fluid mixture of a binder with a liquid, and then the dispersion is passed through the flow channels in the element. After that, the excess mixture is removed from the channels of the element.

Using the methods described in DE 2924592 and WO 93/12904, make the body of the Converter, in which the outer zone of the element with a honeycomb structure soldered to the tubular casing. As a result, between element with a honeycomb structure and a tubular casing formed of a rigid connection.

From WO 94/06594 already known method, in which an element with a honeycomb structure you solder to tubular casing only on a certain site in the axial direction, for ment with a honeycomb structure is inserted into this tubular casing.

From WO 93/25339 known another way of soldering element with a honeycomb structure to the tubular casing, in which the solder is applied to the end sides of the element with a honeycomb structure along its length.

In the implementation of most of the known methods of soldering, such that the solder is applied from the side of the ends, a metal sheet element with a honeycomb structure not only are soldered to each other, but also forms a connection between the element and the tubular casing. This is, in particular, in devices with a cellular structure made up of a large number of mostly spiral or voluntourism rolled metal sheets, as well as in a spiral twisted elements with a honeycomb structure with a corrugated outer layer. Therefore, in such ways soldering targeted connection element with a honeycomb structure with a tubular casing only on a certain section in the axial direction is difficult. Often there are additional connections between the element and the tubular casing, especially on the flanks.

Because the element with a honeycomb structure and a tubular casing have different thermal expansion characteristics, the CPF is with a honeycomb structure may experience heat stress, which can lead to damage.

The basis of the invention was based on the task to improve the known element with a honeycomb structure, in order to avoid prepaymania it to the tubular housing in certain areas in the axial direction regardless of the method of soldering.

This task in accordance with the invention is solved using the proposed element with a honeycomb structure for the passage of exhaust gases, made in the form adjacent to each other rolled or typed in the package at least partially structured metal sheets to form between their layers of flow channels installed in the tubular casing and soldered thereto in the axial direction on a portion of its length, with at least one metal sheet has at least one smooth area, passing at least one end side of the element on part of its length in the axial direction and at least partially covering it. In accordance with the invention in that the element edges of the metal sheets fit within at least one smooth area.

In a preferred embodiment of the invention at least one metalliche to the coupling of the tubular casing.

Preferably also, when the edge of the pack twisted in mutually opposite directions respectively around the at least two anchor points, and the smooth section is provided on sheet metal, located approximately in the middle of the pack.

It is advisable smooth areas to have partial overlap in the direction of the coverage items.

When two or more smooth area can be arranged with full joint coverage element.

Element with a honeycomb structure according to the invention, which preferably can be applied in the device catalytic conversion of exhaust gases in the EXHAUST system, is attractive because of the smooth segment passing at least one end-side part of its length in the axial direction and at least partially covering it, forms a perimeter member of the outer layer, which is adjacent to the tubular casing. Because smooth land adjacent to the tubular casing, regardless of the method of soldering the solder may not get fully or partially between the smooth portion and a tubular casing. The application of the solder can be carried out in a known manner in the part length in its axial direction and a smooth plot comes in the axial direction only to the area of connection between the element and the tubular casing, then it offers the possibility of thermal expansion in the axial direction of the element because the element is connected to a tubular casing in only one or a few areas. In other areas of the element and the tubular casing is undesirable prepaymania to each other. In addition, the solder may be applied to one or both end sides of the element along its length and when this does not happen the connection of the external layer of the element with the tubular casing. Another advantage of this design element is that in its manufacture in the case of prepaymania only one face side does not matter which one end side of the element along its length causing the solder. It simplifies the manipulation and manufacture of such element with a honeycomb structure.

Other advantages of the invention will become clearer from the following description of examples of its implementation with reference to the accompanying drawings, where:

in Fig. 1 shows a schematic longitudinal section of an element with a honeycomb structure with a tubular casing,

in Fig. 2 - S-shaped twisted element with a honeycomb structure,

in Fig. 3 is a schematic representation of an element with a honeycomb structure, impoverishes section,

in Fig. 5 in an enlarged scale the V-cut of the marginal zone of the element with a honeycomb structure according to Fig. 3,

in Fig. 6 is a first embodiment of a smooth plot,

in Fig. 7 is a second embodiment of a smooth plot.

In Fig. 1 schematically shows a device for the catalytic conversion of exhaust gases in the EXHAUST system, in particular in the EXHAUST system heat engines, preferably internal combustion engines with spark ignition. The device includes mounted in a tubular casing 1 element 2 with a honeycomb structure, through which the exhaust gases and in which the flow channels 3 are formed between adjoining to each other by layers of smooth metal sheets 4 and structured, preferably corrugated, metal sheets 5. Element 2 with a honeycomb structure is connected to a tubular casing 1 on a portion of its length L in the axial direction. In Fig. 1, the connection zone between the element 2 with a honeycomb structure and the tubular casing 1 is indicated by item 12.

Element 2 with a honeycomb structure has on the metal sheet 5 of the first 9 and second 10 smooth areas that surround its perimeter. The first 9 and second 10 plots are from the end faces of the organisations of the element 2 with the tubular casing 1.

In Fig. 2 shows a second exemplary embodiment of an element with a honeycomb structure. For simplification in Fig. 2-5 image is not displayed tubular casing 1. Element 2 with a honeycomb structure consists of typed in the package 13 smooth 4 and 5 corrugated metal sheets. The edges of the package 13 twisted in mutually opposite directions, respectively, around the anchor points 14, 15. In the element with a honeycomb structure provided with two sheet metal 16, 17, each of which has a smooth sections 8 or 9. Smooth metal sheets 16, 17 form the outer layers of the package 13.

Each of smooth sections 8, 9 comes to an adjacent parcel 9 or 8 sheet metal 16 or 17.

In Fig. 3 shows a second exemplary embodiment of an element with a honeycomb structure. This element with a honeycomb structure also consists of typed in the package 13 of the metal sheets 4, 5, which form flow channels 3 for the passage of gas. The package 13 is curled around the anchor points 14, 15. In the package 13 is provided sheet metal 18, one of the sections 10 which is made of a smooth and has such a size that it covers the element with a honeycomb structure around the perimeter.

In Fig. 4 shows another variant embodiment of the invention. Approx what their areas 10, 20 completely cover the perimeter of the element 2 with a honeycomb structure.

In Fig. 5 in an enlarged scale shows how smooth section 10 shown in Fig. 3, adjacent to typed in the package 13 metal sheets 4, 5.

In Fig. 6 and 7 show plots 8, 9 sheet metal. In the embodiment of Fig. 6 between the parts 8, 9 includes a neck 21, which leaves the free zone 12 of the connecting element 2 with a honeycomb structure with a tubular casing 1. May also include other smooth areas, performed with deviation from each other and placing between them a cut. The geometry of smooth sections can be selected in accordance with the form of the connection zone.

1. Element with a honeycomb structure for the passage of exhaust gases, made in the form adjacent to each other rolled or typed in the package at least partially structured metal sheets to form between them a layer of flowing channels, mounted in a tubular casing and soldered thereto in the axial direction on a portion of its length, with at least one metal sheet has at least one smooth segment passing at least one Torrevieja fact, the edges of metal sheets fit within at least one smooth area.

2. Element with a honeycomb structure on p. 1, characterized in that the at least one metal sheet has first and second smooth areas, running from the end sides of the element and reaching up to areas the coupling of the tubular casing.

3. Element with a honeycomb structure under item 1 or 2, characterized in that the edges of the package twisted in mutually opposite directions respectively around the at least two anchor points, and the smooth section is provided on sheet metal, located approximately in the middle of the pack.

4. Element with a honeycomb structure according to any one of paragraphs.1 to 3, characterized in that smooth areas are partially overlapping in the direction of the cover element.

5. Element with a honeycomb structure according to any one of paragraphs.1 to 4, characterized in that two or more smooth plot is located with the option of a joint coverage member.

 

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