DE3817490C2 - Support body for a catalytic reactor for exhaust gas purification - Google Patents

Description

The invention relates to a support body for a kata lytic reactor for exhaust gas purification according to the generic term of Claim 1.

Carrier bodies of this type are known (DE-GM 87 12 267 - G 8063). In these designs, the matrix is for the carrier body from a corrugated strip and a smooth strip by winding poses. The winding body thus formed is then in one Housing shell used, for better soldering with the Sheath a wire mesh around the outside of the wound matrix body is laid. This measure was proposed because of the ge wrapped up relatively stiff and inelastic matrix bodies Tolerance deviations with its outer circumference are not always tight puts enough on the jacket sleeve, so that difficult when soldering occur. In these known designs, however, occur also during operation because of the then different Thermal expansion problems that lead to a break in the solder joint can lead.

One has therefore already provided (DE-GM 87 15 289 - G 8171) the wound matrix body in an elastic sleeve insert heat-resistant material and with it in the Bracing the sleeve. The making of one Carrier body can be very expensive.

The present innovation is therefore based on the task that to design a matrix made of corrugated strips so that you have a certain resilience inherent in both the manufacture for a tight fit of the outer circumference of the matrix on the  Sheath sleeve ensures length changes, as well as during operation can absorb largely due to thermal expansion.

To solve this problem, the one for a carrier body suggested type, at least in the case of the Jacket sleeve adjacent corrugated tape both side walls each Corrugation at an angle other than 90 ° after a common side. This configuration will the corrugated tape is designed as a kind of spring band, in which the individual corrugations in the normal direction to the tape course on it absorbing forces by elastic yielding can. This happens because of the influence of such Forces the inclination of the side walls increases, so that, at play with a wound carrier, radial, by heat Dimensional changes caused by stretching due to elastic deformation the corrugated tape can be added without a loading there is a risk of damage.

It is of course particularly advantageous if the carrier body as a whole is made up of a corrugated tape, which with the asymmetrical curl is provided and spirally applied is wrapped. Each of the individual corrugations then runs asymmetrical to radial planes and therefore allows radial elastic compliance.

The new carrier body can thereby be wound in the usual way be that an inventive corrugated tape together is wound up with a smooth tape. Because in this case continuous smooth belt but u. U. the radial extensibility and Can prevent deformability, it is better if the Tunnel underneath each corrugation, bottom of the tunnel floor not from a smooth belt, but again from a corrugated belt is formed, but which is provided with a kind of microwave which is a much smaller division and also a very much smaller height of each curl compared to that Corrugation of the actual corrugated tape has. It is possible  also, to form the tunnel floor area by a zigzag band leave, which is also compliant in its longitudinal direction and does not affect radial extensibility.

This with the "microwave" corrugated band or in Zigzag-shaped smooth band allows stretching in Longitudinal direction. It is also compliant and composes with the "inclined corrugated tape" is an excellent opportunity one elastic in itself, but otherwise conventional Woundly wound support body for a catalytic reactor to accomplish.

A carrier body according to the invention can of course also be used then produce when using a smooth tape or a corrugated band provided with the microwave is dispensed with. They are corrugated tapes with a trapezoidal cross-section of the corrugations known that up without the interposition of a smooth belt can be wrapped and a slipping of the corrugations avoid. Such corrugated tapes can also be trained in this way that the side walls of the tunnel-like corrugations Preserved inclination and therefore also a can cause elastic yielding of the tape.

Finally, it is also particularly advantageous Way possible when using the idea of the invention Corrugated tape in the transverse direction in different, parallel to each other other and parallel to the outer edges of the corrugated tape dividing zones, of which at least one is one under has a different width than that of the other zones. In neighboring zones are then the side slopes of the Side walls of each tunnel-like corrugation are different forms. This configuration creates a corrugated tape that with a second corrugated belt of the same design, but that is Is twisted 180 ° to the first, wound up to the carrier body can be without the risk of the curls slide into each other. The respective apex areas the corrugations come across at some point  speaking apex areas of the opposite ligament. Especially if the corrugations have an approximately rectangular cross section a good support of adjacent corrugated strips against each other other, also because parts of the rectangular ceiling areas of the Corrugations of corrugated strips assigned to one another area-like other, for soldering the two tapes after the winding process can be exploited. There arises in itself solid support body, also secured in the axial direction, the but is resilient in the radial direction. Such a Carrier body can absorb thermal expansion. He ver largely avoids the risk that Be Damage to the solder joints occurs. He also brings that Advantage with itself that the matrix with its outer circumference presses tightly and elastically onto the sleeve during manufacture and so offers an intimate contact for the soldering. A Similar solution can also be achieved with two tapes, the are not divided in the transverse direction, but corrugations with ent opposite inclinations and different division point.

The invention is based on exemplary embodiments in the Drawing shown and is explained below. It demonstrate:

Fig. Dung 1 is a schematic cross section through a carrier OF INVENTION to the invention with a body disposed between a casing sleeve and a conventionally formed winding body according to the corrugated strip OF INVENTION,

Fig. 2 is an enlarged detail view of a portion of the area between the casing sleeve and winding body,

Fig. 3 shows a known corrugated strip and including, an inventive from that produced corrugated strip,

Fig. 4 is an enlarged detail view of the modern fiction, corrugated strip of Fig. 3 and its manufacture, wherein the corrugated strip at two adjacent smooth bands on completion channels tunnel-like corrugations to flow,

, But with a ribbon Fig. 5 is a view similar to FIG. 4, the tunnel-like corrugations final further Well,

Fig. 6 is a sectional view similar to FIG. 1, but at a carrier body which is made entirely of a corrugated strip according to the invention OF INVENTION Fig. 5,

Fig. 7 cutouts of two adjacent layers of a variant of the corrugated strip according to the invention, in which no intermediate layers of a smooth band or a corrugated strip provided with a Miniwellung necessary

Fig. A further variant of the invention being stalteten corrugated strip that can be wound without intermediate layers passage 8 in a perspective, schematic representation during Wickelvor,

Fig. 9 is a schematic sectional view of the wound body of Fig. 8 taken along the plane IX-IX,

Fig. 10 is a partial section through a zone of the band of Fig. 8 taken along the line XX,

Fig. 11 is a section similar to FIG. 10, but through an adjacent region along the line XI-XI,

Fig. 12 is a side view of a corrugated band according to the invention similar to Fig. 4 or 5, but in a wide ren embodiment with a zigzag band and

Fig. 13 seen the view of the corrugated tape of Fig. 12 from below in the direction of arrow XIII.

In Figs. 1 and 2, a carrier body is shown, which consists of an outer casing sleeve (2) made of metal and a by winding a known corrugated strip (3) with a smooth strip (6), both made of metal honeycomb bodies produced, which in the axial direction can be flowed through by the exhaust gas. Between the inner honeycomb body and the casing sleeve ( 2 ), a ring made of corrugated tape ( 1 ) is used, the corrugations of which deviate from conventional corrugated bands and are shifted to one side at an angle to the longitudinal direction of the tape. This inventively constructed corrugated strip has, in contrast to a known corrugated strip (1 ') of FIG. 3, the side walls (5' and 5 a ') are arranged symmetrically to a plane perpendicular to the longitudinal direction of the belt center plane (20), in each case under a Angle (β or γ) - see also Fig. 4 - to the longitudinal direction ( 21 ) extending side walls ( 5 and 5 a), which give it an asymmetrical corrugated profile, in which each also through the center ( 22 ) of the apex of each Corrugation and through the center of the bottom surface plane ( 24 ) is inclined to the longitudinal direction at the angle (α). Such a corrugated tape can be made by forming a commercially available corrugated tape ( 1 ') according to FIGS . 3 and 4. The height (h) of the new corrugated tape ( 1 ) is slightly smaller than the height (h ') of the starting tape. As is readily apparent when looking at Fig. 2 or 4, such a corrugated tape ( 1 ) with oblique and asymmetrical corrugations, which is made of metal like the known corrugated tapes and acts as a kind of spring band, easily able , In the normal direction to the longitudinal direction ( 21 ) acting forces increase elastically in that the side walls ( 5 , 5 a) each pivot by a further angle of deformation clockwise ver to the right, so that thereby the height (h) of the corrugated tape is lower. These properties lead to the fact that in the embodiment form of FIG. 1, the outer circumferential corrugated band forms a kind of elastic buffer, which can change its height during thermal expansion and therefore causes a certain flexibility of the body in the jacket sleeve ( 2 ) . Since the outer circumferential corrugated strip ( 1 ) also forms flow channels, in contrast to the use of a separate elastic insert, the outer space can also be used for the flow of exhaust gas and for the conversion.

From Fig. 2 and in particular 4 it follows that each of the individual corrugations forms a type of tunnel ( 4 ), which must be closed down to form a flow channel. This is not different from known, wound from corrugated carrier bodies. According to FIGS. 4 and 2, a smooth metal strip ( 6 ) is provided as the lower end, which at the same time can form the connection to the honeycomb body of FIG. 1 wound in the usual way.

It is of course also possible to wind the entire honeycomb body from the corrugated strips ( 1 ) according to the invention, in which case the smooth strip ( 6 ) represents the connection to the adjacent winding position of the corrugated strip ( 1 ) and, as known, prevents it from occurring, that the corrugations of the adjacent layer can slide into the lungs of the first layer and prevent the formation of flow channels.

FIGS. 5 and 6 show a modification of a support body which is used as in Fig. 1 in a casing sleeve (2). According to Fig. 5 no smooth strip, but a corrugated strip (7) as a lower termination of the tunnel (4) and as a tunnel floor see easily, the corrugation may be referred to, however, in comparison with the corrugation of the strip (1) as a kind of Mikrowellung. The pitch (t) and the height (a) of the corrugation of the band ( 7 ) are significantly smaller than the division (T) and the height (h) of the corrugated band ( 1 ). The corrugations of the band ( 7 ) can be symmetrical, ie symmetrical to planes that are perpendicular to the longitudinal direction of the band. This configuration has the advantage that, in contrast to the embodiment in FIG. 4, where the smooth strip ( 6 ), which is usually soldered to the corrugated strip ( 1 ) after winding and connects the feet of the corrugation, the corrugated strip ( 1 ) not only is there the possibility of yielding in height (h) by elastic pivoting of the side walls ( 5 and 5 a), but also in the distance between the feet of the two side walls ( 5 and 5 a). The tunnel floor surface ( 4 a) is thus stretchable even in the longitudinal direction ( 21 ), so that in this way a carrier body wound from a band combination according to FIG. 5, as shown in FIG. 6, is elastic in itself and therefore both when installed, ensures that the casing sleeve ( 2 ) is fully planted, which allows better soldering, and is also ideally suited during operation to absorb dimensional changes as a result of thermal expansion, without the risk of damage to the solder joints between the casing sleeve and the winding former , or to be affected by the flow channels formed by the well bands.

Both in FIG. 4 and in FIG. 5 it is indicated that when a winding body is made from a corrugated strip ( 1 ) and a smooth strip ( 6 ) or corrugated strip ( 7 ) assigned to it on one side, the ceiling of the tunnels ( 4 ) abuts a corresponding band ( 6 'or 7 ') assigned to the next corrugated band layer. In this way, the wells between two successive corrugations with the side walls ( 5 a and 5 ) lying in turn form tunnel-like flow channels ( 25 ) through which the exhaust gas can flow.

While both previously described embodiments of FIGS. 4 and 5 each show an additional band, the smooth strip (6) or the "mini corrugated strip" (7), the reciprocally sliding Benach barter corrugations prevented during the winding operation is shown in Fig. 7 is an embodiment of a corrugated strip ( 1 '') shown, which makes the use of an additional tape unnecessary. This corrugated tape ( 1 '') has a trapezoidal cross-section of the tunnel ( 4 '), the longer side of the trapezoid of the tunnel ceiling ( 4 c') and the smaller trapezoidal side ( 4 b ') of the tunnel floor area ( 4 a) are assigned . In this case, the side walls ( 5 '', 5 a '') are each inclined at angles (β and γ) to the longitudinal direction ( 21 ), these angles not being the same size as the angles (β and γ) of Corrugated tape ( 1 ) must have. In a trapezoidal corrugated strip ( 1 '') designed in this way, flat surfaces ( 8 ) are formed which correspond to the larger trapezoidal side ( 4 c ') and which are sufficiently large to prevent the corrugations of a layer from corresponding to the cavities in the corrugated strip can slip in at the neighboring location. Nevertheless, the resilience of the corrugated strips ( 1 '') is given in the aforementioned sense.

Finally, FIGS . 8 to 11 show a further possibility of band formation, with which the slipping of a band into the adjacent position can be avoided without the interposition of an additional band. As is apparent from Fig. 8, two corrugated bands ( 10 and 10 ') are required to produce a wound honeycomb body, each of which is divided transversely to its longitudinal direction ( 21 ) into zones ( 11 , 12 , 13 and 14 ), the parallel to each other and parallel to the outer edges of the bands ( 10 and 10 '). As is apparent from FIGS. 10 and 1, the inclined position of the side walls ( 5 , 5 a) of the corrugations in the adjacent zones, of which the zones ( 12 and 13 ) are shown, are each different and in the exemplary embodiment opposite to normal planes chosen for the longitudinal direction ( 21 ). In addition, in the exemplary embodiment, the width (A) of the zone 11 is selected to be larger than the width (B) of the other zones ( 12 to 14 ) and it is provided that the two strips ( 10 and 10 'provided for the winding process according to FIG. 8 ) are rotated by 180 ° to each other. The zone ( 11 ) with the greatest width (A) of the band ( 10 ) is therefore in the region of the zone ( 14 ) of the lower band ( 10 ') while the zone ( 11 ) with the width (A) of the lower band ( 10 ') Comes to rest in the area of the overlying zones ( 14 and (partially) ( 13 )) when the tapes are wound up. This measure means that there is always a closed, approximately flat part in the winding process, as shown in FIG ( 8 ) a corrugation of the belt ( 10 ) on a closed flat part ( 8 ') of the adjacent belt ( 10 '). The belts can be wound together without the interposition of a smooth belt or the like and form the tunnel-like flow channels between them 4. A similar effect can also be achieved if two corrugated tapes are used with a structure according to Fig. 3, but in which the division of the corrugations differs, so that such tapes are connected to one another without the interposition of smooth tapes wound that the inclinations of the corrugations in the adjacent layers are different, then there are also winding bodies which correspond to the cross section of FIG. 9, only that the band drawn there ( 10 ') has a larger - or smaller - division of the corrugations . This configuration also enables the construction of a carrier body in which adjacent corrugations do not slide into one another.

FIGS. 12 and 13 show a further possibility of an OF INVENTION to the invention the corrugated strip, which may be similar to the embodiment of Fig. 5 provide a certain radial flexibility, if probably no corrugated strip is provided with a so-called see Mikrowellung. From Fig. 13 it is clear that instead of a smooth tape, as is provided in Fig. 4, a zigzag tape ( 6 '') provided smooth tape closes the underside of the corrugated tape ( 5 ). An analog zigzag band ( 6 ''') is provided on the upper side of the corrugated band ( 1 ). In Fig. 13, the oblique side walls ( 5 ) of the corrugated tape ( 1 ) from the underside of the zigzag tape ( 6 '') are visible. The arrangement of a zigzag band enables better stretching of each of the zigzag band ( 6 '') and the corrugated band ( 1 ) formed because of the soldering not continuous over the full depth. The arrangement of a zigzag band also allows a certain radial gas balance between two windings. Therefore, if the side walls ( 5 , 5 a) of the corrugated strip ( 1 ) are still provided with slots or openings in a manner known per se or if a band formation similar to FIG. 8 is provided, then this formation can be used together with a zigzag band perform a radial gas balance in the finished catalyst body. Two tapes according to FIG. 8, which are wound with one another by 180.degree., Are then not necessary.

Claims (9)

1. Support body for a catalytic reactor for exhaust gas cleaning, especially for internal combustion engines of motor vehicles, which is Herge using metallic corrugated tapes, which are held together in a jacket sleeve and are each arranged in adjacent layers so that each corrugation of a tape is a tunnel forms, which is closed by the adjacent band to a flow through the exhaust gas, characterized in that at least in the case of the jacket sleeve ( 2 ) adjacent corrugated band ( 1 ) both side walls ( 5 , 5 a) of each tunnel ( 4 ) under one of 90 ° deviating angles (β, γ) are inclined towards a common side. 2. Carrier body according to claim 1, characterized in that the tunnel bottom surface ( 4 a) is formed by a metallic smooth strip ( 6 ). 3. Carrier body according to claim 2, characterized in that the smooth band is designed as a zigzag band ( 6 ''). 4. Carrier body according to claim 1, characterized in that the tunnel bottom surface of a corrugated tape ( 7 ) with a much smaller pitch (t) and height (a) of the corrugations than that of the tunnel ( 4 ) forming corrugated tape ( 1 ) is formed . 5. Carrier body according to claim 1, characterized in that the tunnel bottom surface ( 4 a) of straight parts ( 8 ) of a rectangular tunnel ( 4 ') of the adjacent corrugated tape is formed. 6. Support body according to claim 5, characterized in that the shape of the rectangular tunnel ( 4 ') is trapezoidal in a conventional manner, the larger side ( 4 c') of the trapezoid of the tunnel ceiling and the smaller side ( 4 b ') the tunnel floor area ( 4 a) is assigned. 7. Carrier body according to claim 5, characterized in that the corrugated strip ( 10 ) is divided transversely to its longitudinal direction (L) into zones ( 11 to 14 ) in which the inclination planes ( 15 , 16 ) of the side walls point in opposite directions. 8. Carrier body according to claim 7, characterized in that the width (A, B) of the zones ( 11 to 14 ) is different. 9. A carrier body according to claim 8, characterized in that adjacent corrugated tapes ( 10 , 10 ') are wound spirally wound by 180 ° against each other.