CN1084429C

CN1084429C - Catalyst carrier arrangement

Info

Publication number: CN1084429C
Application number: CN96193516A
Authority: CN
Inventors: 斯文·M·尼尔森
Original assignee: C MILA
Current assignee: C MILA
Priority date: 1995-04-27
Filing date: 1996-04-18
Publication date: 2002-05-08
Anticipated expiration: 2016-04-18
Also published as: KR19990008026A; SE506670C2; SE9501556D0; DE69629196D1; EP0840840B1; AU5412096A; DE69629196T2; JPH11504094A; WO1996034188A1; CN1182468A; ES2203689T3; SE9501556L; EP0840840A1

Abstract

The invention concerns a carrier arrangement for catalytic converters comprising a catalyst body (1) consisting of a monolith (3) formed of carrier members desined to support a catalytic material, and of a metal casing (2, 9) enclosing the monolith (3). The interior width of the casing (2, 9) exceeds that of the monlith (3) whereby a gap (6, 11) forms between the casing (2, 9) and the monolith (3). This gap (6, 11) is bridged at least in the area of a section (7, 10) extending circumferentially around the monolith (3), the monolith (3) being attached to the casing (2, 9) along said section (7, 10).

Description

Catalyst carrier arrangement

The present invention relates to the used bearing device of catalytic converter.

The substrate that is used for supporting catalyst in internal combustion engine exhaust system mainly is the stupalith sheet.Yet in recent years, metal substrate is adopted in a large number.The advantage of metal substrate is that it more promptly reaches operating temperature than ceramic substrate, and correspondingly, the stage early after opening beginning work begins its waste-gas cleaning function, and this is most important performance.In addition, metal substrate is more effective heat conductor, and therefore, it can more promptly be heated, and the danger of local superheating has also just reduced.And metal substrate bears higher temperature than ceramic substrate.

So-called metal monolithic is used as the bearing device of supporting catalyst.These monolithics are made of stainless sheet metal preferably, are that sheet metal by the sheet metal of smooth configuration and flute configuration alternately is wound in and rolls into, thereby form the liquid pipe that penetrates catalytic body.The thickness of thin slice is little as only to be 0.05mm usually.Catalytic body comprises the layer of metal cladding, and it forms one deck shell, round the monolithic that is contacted.The thickness of cladding can be about 1 to 1.6mm.

When hot waste gas during the internal combustion engine operation was flowed through monolithic, thin load-bearing member thin slice was heated rapidly.Usually, temperature reaches 500 to 800 ℃ rapidly.In the internal-combustion engine of some type, temperature can rise between 1100 to 1200 ℃.In case when internal-combustion engine was stopped transport, the temperature of catalytic body was reduced to the degree of external temperature rapidly.

Temperature changes repeatedly, and having formed one influences the catalytic body problem in long-term working life.The thin slice that those are heated rapidly in the monolithic also expands rapidly.That layer material thickness that is reclining monolithic and closely do not contacting with waste gas bigger around shell, be heated and expand with slower speed.Therefore, when being heated, shell prevents the monolithic expansion, can form sizable radial pressure that causes the monolithic distortion like this.When reaching above-mentioned high temperature degree, the intensity of metal also can reduce greatly, reduces to its intensity about 10% at room temperature usually, and this can aggravate to be out of shape and to shorten the life-span of monolithic.

But when internal-combustion engine was stopped transport and waste gas cools down, opposite phenomenon had taken place, i.e. the thin slice rate of cooling of the monolithic on every side shell thicker faster than that layer.Thereby, between the most external and that layer cladding of monolithic, produced sizable tension force.

Because above-mentioned a variety of causes, just relate to metal monolithic how attached a lot of problems in its shell.Existing people proposes at this point and tested some different solutions, but produces little effect usually.Also the someone has developed some effective structures, for example developed once tame German company Emitec GmbH, but these structure more complicated and costlinesses.All these formerly a common trait of technology solution be, wherein be used for the different metal lamella of monolithic, be by soft soldering and interconnective, that layer of outermost thin slice then soft soldering on shell around that layer.

The invention provides a kind of method of easy, the reliable and economical and practical firm problem of solution.This way is for soft soldering metal monolithic together in a manner described and the metal monolithic is linked together in certain other modes without soft soldering, and effect is all arranged.The characteristic performance of this attachment method is expressed in the claim of enclosing.

Below, illustrate in greater detail the present invention with reference to accompanying drawing.In these accompanying drawings:

Fig. 1 passes catalytic body and the longitudinal profile partial schematic diagram drawn;

Fig. 2 passes catalytic body and the similar longitudinal sectional drawing drawn, shows that an attachment arrangement according to the invention improves product; And

Fig. 3 is a part of zoomed-in view of attachment arrangement according to the invention.

Fig. 1 shows the basic design scheme of invention subject matter.Catalytic body 1 comprises that one deck is sealing the metal shell 2 of so-called monolithic 3.Monolithic then is made of load-bearing member, these load-bearing members design to such an extent that supporting catalyzer, and, by some arrange make smooth configuration sheet metal 4 and flute configuration sheet metal alternately and the sheet metal that spiral twines constitutes so that form the liquid pipe 5 of break-through catalytic body 1.The width of monolithic 3 or diameter are small in the inner width of shell 2.Correspondingly, form space 6 between shell 2 and monolithic 3, its size changes according to different temperature ranges.

According to the present invention, shell 2 has at least one strip depressed part 7, is that two such depressed parts are arranged by the accompanying drawing illustrated embodiment, thereby in the zone facing to this depressed part, has just eliminated in the space 6 around the monolithic.Along these depressed parts 7, shell 2 and monolithic 3 for example are connected to each other with soft soldering or welding manner preferably only at 8 places, interval that are spaced.

When monolithic 3 was flowed through its waste heating, monolithic 3 expanded sooner than shell 2, and this part is because monolithic 3 contact closelyr with hot waste gas, partly is the thicker cause of material owing to shell 2.Except taking place depression 7 zones of certain distortion, expand to essentially no obstruction this moment at monolithic 3 outmost thin slices 4.Thereby, along monolithic 3 main surface portions, can not produce pressure.When shell and monolithic 3 cooled off once again, monolithic 3 can shrink once again, thereby space 6 is expanded once again and opened.

Because monolithic 3 only suffers a spot of local deformation in depressed part 7 zones, and can freely expand everywhere and shrink, catalytic body 1 compared with so far possible coming, can under injury-free situation, work for a long time, thereby increase its working life.

Can economize slightly a slice or some outermost thin slices 4,, be connected on the adjacent thin slice within it, rather than a slice is connected on some points that laterally leave attachment point 8 with connecing a slice, reach further improvement along the length of whole thin slice.When monolithic 3 cools down when shrinking thereupon, because the elasticity that the outermost surface thin slice 4 of outermost surface thin slice between being connected to each other a little is endowed, 8 places do not have great tension force in attachment point.

Fig. 2 and Fig. 3 show the modified model of means for attachment according to the invention.In the case, outlet pipe 9 is as shell.According to this improved procedure, each end of monolithic 3 has an annulus 10, this ring outstanding outside its relevant monolithic end, and be connected on the outlet pipe 9.Ring 10 is preferably by identical mode embodiment illustrated in fig. 1, at 12 places, interval that separate, and attached monolithic 3.Ring 10 was crossed between outlet pipe 9 and the monolithic 3 space 11 that forms, and therefore, in a single day monolithic is heated when cooling off, and just was endowed one for the space more freely of expanding with contraction, and simultaneously, it also is being securely connected within outlet pipe 9.

The present invention is not limited to several embodiments shown and explanation, but can make an amendment in many ways in the scope of enclosing.For example, can between shell 2 and monolithic 3, insert one or several insert, rather than in shell, form depressed part 7, come cancellation space 6.

Claims

1. the used bearing device of catalytic converter, comprise that one is come the supporting member monolithic (3) of supporting catalyst and material thickness to surpass sheet metal (4) thickness by design and sealing the catalytic body (1) that the metal shell (2) of monolithic (3) constitutes, this load-bearing member is by some alternately stacks and spiral is wound in the smooth configuration sheet metal and flute configuration sheet metal (4) formation of the liquid pipe (5) of break-through catalytic body (1), this bearing device is characterised in that: shell (2,9) inner width surpass monolithic (3) thus inner width at shell (2,9) and between the monolithic (3) form space (6,11), also be above-mentioned space (6,11) at least at peripheral expandable part (7 round monolithic (3), 10) crossed in the zone, this monolithic (3) quilt is along this part (7,10) be attached at shell (2,9) on.

2. device according to claim 1 is characterized in that: space (6) are crossed over by the radial depressions portion of shell (2) in above-mentioned part (7).

3. device according to claim 1 is characterized in that: in above-mentioned part (7) zone, monolithic (3) only is being attached on the shell (2) in a plurality of points (8) of monolithic on the periphery.

4. device according to claim 1 is characterized in that: monolithic (3) is formed at each end of crossing over and be attached at the peripheral circles (10) on the shell (9) between monolithic (3) and shell (9).

5. device according to claim 4 is characterized in that: ring (10) only is being attached on the monolithic (3) on some points (12) of monolithic periphery.