DE4004861C2 - - Google Patents

Abstract

The particle filter for cleaning the i.e. engine exhaust gas consists of a housing (1) with an inlet (5) and an outlet chamber (11), and an outlet pipe (12). The filter has a number of filter elements, which are supported at each end in retaining plates (2,3). The housing has an inlet for the exhaust gas and an additional inlet (8) for hot gases from an independent burner. The hot gases are used for burning off the carbon particles collected by the filter elements and to clean the filter. The inlet end support plate is provided with holes for the through flow of the exhaust gas and hot gases from the burner.

Description

The invention relates to a particle filter for cleaning the Exhaust gas from internal combustion engines with filter cartridges, in one with an inlet chamber and an outlet funnel housing are arranged between holding plates and from one with exhaust gas passage openings provided, covered with filter material support tube are formed and additional heat for those from a heat source regeneration is supplied by burning.

Such particle filters are used for cleaning exhaust gases Internal combustion engines, especially in vehicles using diesel fuel operated, needed to remove the soot particles that are harmful to health are and represent a high and dangerous environmental impact, filter out. These particle filters are available in two versions known. In one embodiment, the exhaust gas is filtered when flowing through a ceramic block (monoliths) that has a variety of through channels, each of which has a checkerboard shape Channel is closed on the inlet side and one channel on the outlet side, so that the exhaust gas flows into one channel, then through the as Filter acting surrounding monolith section in the neighboring Channel flows in and leaves this, freed of soot particles. One describes such a soot filter. B. DE-OS 32 17 357.

The other embodiment uses filter cartridges for particle filtering. These filter cartridges are preferably designed as a wound filter. Here, a support tube provided with exhaust gas passage openings  multi-layer wrapped with filter material threads, so that one with a Textile yarn spool comparable element is created. Such an arrangement shows z. B. DE-OS 38 15 148 with a special presentation of Storage of the filter candles in holding plates. The filter candles can also through a hose cover made of filter material over a support tube be formed according to DE-OS 38 23 205. The filter candles too are flowed through from the outside in, the exhaust gas to be cleaned occurs through the filter material in the support tubes, which are closed on the inlet side are one, the soot particles are flowing through the wound filter material and the cleaned exhaust gas flows through the support pipes into the outlet funnel and is from there dissipated. The filter candles are on concentric circles in the Filter housings are arranged and are of a uniform design. Instead of the inlet-side holding plate provided with exhaust gas passage openings a holding grid can also be arranged.

During the operation of the internal combustion engine takes place when flowing through the particle filter is a soot, d. that is, the filter material settles increasingly with soot particles, and the soot has to be relative short operating time can be removed. A mechanical removal practically eliminated because the entire filter is removed and the soot would have to be disposed of. One is therefore on fire or burning free of the enriched soot. To do this the exhaust gas from a reservoir oxidizer as additives added so that the collected soot with these the soot ignition temperature reducing and increasing the rate of combustion comes into contact and can be burned down. This kind of free burning However, the accumulated soot has the disadvantage that the additives are chemical compounds that are flammable and the exhaust gas enriched with undesirable components, their environmental compatibility has not yet been proven. One has therefore already tried one It was possible to connect diesel burners as external heat models with the known arrangement but not the driving mode of the vehicle Regenerate filter. Therefore, this solution is very large  Filter instructed to get a storage capacity that one allows longer driving between the regeneration phases. These Rest regeneration is possible for vehicles that operate in intervals work, e.g. B. Buses in inner-city operation. For others Vehicles must be regenerated while driving. For this you have z. B. two filters arranged parallel to each other and regenerates one of the two filters.

If only one particle filter with several filter cartridges or a monolith block with many channels becomes a "driving regeneration", as soon as a higher occupancy with soot particles z. B. about the exhaust gas back pressure an external heat source is activated, which heats the exhaust gas to be cleaned so far (<600 ° C) that the Free burning process can take place. However, it has been shown that especially in load conditions with low exhaust gas mass flow during the Regeneration does not burn the filter candles over their entire length be that, depending on the exposure, the inner filter cartridges further than the outer ones are burned free. Cause of this is that the front half of the filter cartridges is already burning free ensures a sufficiently low flow resistance and so that the rear part or the outermost filter cartridges are not sufficient be flowed through. Resulting from this imperfect regeneration shorter and shorter re-infiltration times, which in the worst case can lead to failure of the filter. Experiments have shown that the Infusion time of e.g. B. 135 minutes at first infusion to 15 to 20 Minutes went back.

Based on this prior art, the object of the invention based on showing a particle filter that regeneration enables while driving and with a high degree of free burning is achieved over the entire filter length, so that the re-infusion time is approximately constant and corresponds to the first infusion time.  

This problem is solved with a particle filter in that about the cross section of the housing distributed in at least one holding plate mounted overflow pipes are arranged, and that the inlet side Holding plate in the not of filter core support pipes and overflow pipes occupied area has exhaust gas passage openings. These Solution is after obvious, possibly necessary modifications applicable to all particle filters, even those where the Filtering takes place via channeled monoliths. In this In case the overflow pipes are open on both sides, into - here Described later - additional chamber opening channels.

In the case of a generic particle filter equipped with soot filter cartridges are the filter cartridges in a downstream front and one rear mounting plate. The exhaust gas to be cleaned is the Filter candle area (the cleaning zone) through exhaust gas openings in the front holding plate and through the overflow pipes fed to the inlet funnel or the inlet chamber. During the Regeneration is the exhaust gas external heat, in the inlet chamber z. B. supplied by a burner operated with liquid fuel, so that over the exhaust gas heated to the ignition temperature the free burning process is initiated. The overflow pipes in the downstream area Have exhaust gas outlet openings and are closed on the outlet side lead exhaust during the Aufrussphase in the downstream lower Area of the filter candles and thus cause a more even exposure the filter candles over their length. In the free burning phase (Regeneration phase) is correspondingly through these overflow pipes hot exhaust gas (exhaust gas to be cleaned mixed with hot exhaust gas from the external heat source) the downstream rear area of the filter cartridges fed so that this section of the filter cartridges through Free burning is regenerated at the same time.

Advantageous and expedient further developments are in the subclaims of the invention shown, at least partially alone or in combination have independent inventive features.  

An expedient embodiment of the particle filter according to the invention shows the feature that an overflow pipe in the longitudinal axis of the Housing and other overflow pipes arranged concentrically to this are, the number of overflow pipes per circuit to the outside increases. As a result, the overflow pipes are arranged such that each Overflow pipe is surrounded by as many filter candles as possible, so that the filter candles all flow as evenly as possible over their length will. This also ensures that the one fitted with filter cartridges Part of the particle filter even at low load conditions is flowed over the entire length. This will automatically even loading or burning of the surrounding filter cartridges reached and a sufficiently long re-infusion time with more even Infestation ensured.

Because the particulate filter is part of the vehicle engine's silencing system are, it is advantageous to give the particle filter also sound damping properties assign. It has been shown that this is the case with simultaneous improvement of the filter properties, both in terms of the sooting as well as the burning free, is possible in that in the particle filter downstream behind the filter candle area another chamber is formed by an inserted floor, which by the pipes carrying the filter material is penetrated and into the overflow pipes open on both sides, so that the exhaust gas or Exhaust gas / hot gas mixture can enter this chamber. This additional chamber acts as a resonance chamber with the support tubes as a resonator chamber and also serves to guide the uncleaned exhaust gas or of the exhaust gas / hot gas mixture back into the filter section of the particle filter, so that the filter candles flow against the downstream area will. This is also the bottom used with exhaust gas openings Mistake. The cleaned exhaust gas flows through the inlet side extended support tubes of the filter cartridges that this additional chamber penetrate into the outlet funnel and from there over the exhaust pipe.  

To ensure the most uniform possible during the regeneration phase Actuation of the filter candles over the entire cross section To reach heated exhaust gas is according to a further embodiment in the flow direction before with filter candles and Overflow pipes provided filter space of the particle filter as Entry chamber arranged a mixing chamber. In this mixing chamber the one to be cleaned is preferably radial or tangential Exhaust gas supplied and the other preferably the axial hot gas. As a result, thorough mixing occurs and thus uniform The exhaust gas heats up and the entire filter cross section becomes evenly applied. The hot gas can be an external heat source are removed or the exhaust gas of a burner attached be. The axial supply of this hot gas can also be via a axially arranged on the inlet side of the mixing chamber inlet funnel respectively. If necessary, this mixing chamber can also flow-directing elements, such as. B. guide surfaces, are attached.

According to a continuation, the overflow pipes can at least have a portion of their length exhaust passage openings, so that the neighboring filter cartridges along the entire length Exhaust gas can be supplied. The overflow pipes are at Arrangement without the additional chamber behind the filter section on the outlet side closed, so that the entire flowing through the overflow pipes Exhaust gas is fed to the filter cartridges. To be even Sooting and a complete open fire are to be achieved the exhaust gas passage openings are arranged in the overflow pipes in such a way that the number of exhaust gas passage openings increases downstream. It is of course also equivalent that the size of the exhaust gas passage openings increases downstream. It is crucial that more exhaust gas downstream is fed to the filter candles, especially when burning free the entire length of the filter cartridges is recorded. This even The exhaust gas also serves the continuation, after which the overflow pipes have different diameters, e.g. B. depending the inflow of exhaust gas from the inlet funnel or the inlet chamber,  the diameters increasing radially outwards. A Continuation shows the feature that the entry chamber at least a connection for the engine exhaust gases to be cleaned and a connection for external heat supply. This arrangement has opposite the known arrangements in which the engine exhaust and the hot gases are fed via an inlet funnel, the advantage that a better mixing can be achieved. To be particularly advantageous has proven that the inlet chamber has a connection flange for has a burner, the hot exhaust gases of which are to be cleaned Engine exhaust gases are added. It is particularly advantageous as Burner to use a flat burner. Such a burner is described for example in DE-OS 34 10 716.

There are in the introduction of the exhaust gas or the exhaust gas / hot gas mixture the downstream rear area of the filter cartridges according to yet another Embodiment of the invention in the entry-side holding plate in the area not occupied by filter cartridge support tubes in the filter room protruding inflow pipes arranged. This is a more targeted one Feeding the exhaust gas to the filter cartridges, especially in the downstream rear area possible, according to a continuation of these inflow pipes protrude differently into the filter space. Because in the Longitudinal axis of the housing, especially when burning free, with a central one Arrangement of the hot gas supply z. B. by the burner an approximately conical free-burning zone arises, d. H. in the central in the longitudinal axis (Middle) area, a deeper separation zone can be made via the Arrangement of the inflow pipes and their different penetration depth a more uniform free burning can be achieved in the filter chamber. In In this case - depending on the free burning profile - the inflow tubes arranged radially on concentric circles outer arranged protruding further into the filter space. The Inflow pipes also have exhaust gas openings, which too can be distributed unevenly over the length of the inlet pipes.  

The improvement in free burning can also be achieved through a particularly advantageous one Arrangement are supported, which has the feature that on at least some of the overflow pipes or the filter core support pipes Inlet tulips are molded. These are through entry Widening of the corresponding pipes formed and bring about an improvement the inflow of the exhaust gas or the exhaust gas / hot gas mixture. This allows a certain control of the sooting or the free burner over the cross section and also over the length of the filter space can be achieved by improving the inflow.

Step into the regeneration of the particle filter by burning free Temperatures in the range of <700 ° C. Although through the aforementioned Features a certain leveling of the sooting or Freibrenners can be reached, after all, tensions occur that too a warping of the individual, stored in holding plates Guide filter cartridges and overflow pipes formed filter body. Relatively small different thermal expansions are sufficient for this of the individual pipes. These are due to the fact that the wrapped Filter cartridges have different thermal conductivities than the overflow pipes. These tensions can lead to premature failure of the Lead particle filter. The known measures, the pipes in one Storage plate to be fastened with a sliding seat in the housing has proven to be insufficient because with this solution the filter block as a whole can expand, but the individual ones Changes in length lead to strong tensions. There are therefore according to a particularly useful training both Filter core support pipes as well as the overflow pipes in one side a sliding seat in one of the holding plates. So everyone has Tube the possibility to expand without causing tension in the Overall system is coming. This is a further expedient embodiment characterized in that the filter core support tubes and the overflow tubes alternating with a sufficiently tight sliding seat in the stored on the inlet side or the outlet side holding plate are. This results in a particularly high stability of the filter arrangement  even at different temperatures, so that in If necessary, even for the filter core support pipes and the overflow pipes different - but of course each heat-resistant - materials can be used e.g. B. steels of different alloy.

The invention is simplified in the figures and schematically in exemplary embodiments is shown and is included below still further explanations described. Are there for simplification two exemplary embodiments are shown in the figures.

It shows:

Fig. 1 shows a longitudinal section of a particle filter

Fig. 2 shows an associated section at point AA

Fig. 3 shows an associated section at point BB

Fig. 4 shows a longitudinal section of further variants of a particle filter

Fig. 5 shows an associated section at the point CC

Fig. 6 shows an associated section at the point DD

Fig. 7 is a longitudinal section further variants of the particulate filter.

The particle filter consists of a housing 1 , in which the filter chamber 4 is formed between an inlet-side holding plate 2 and an outlet-side holding plate 3 . The housing 1 can have any cross section, preferably round or oval. On the inlet side, an inlet chamber 5 is arranged in front of the filter chamber 4 , into which the exhaust gas of the engine to be cleaned is fed via connecting pieces 6, 7 - in the case of two-pipe systems. Furthermore, a further connection 8 of the supply of external heat is provided. In the figures, this connection 8 is shown as a "black box", since the external heat is generated further away and supplied via a connection piece, and is also generated in a burner attached to the connection flange 9 and can be supplied directly. A flat burner is preferably provided as the burner. Patent application P 34 45 437.7 shows an example of an external heat supply. An arrangement that can be used as a flat burner is shown, for example, in patent application P 34 10 716.9. The inlet chamber 5 can also be preceded by an inlet funnel (not shown) via which both the engine exhaust gas and the external heat are then supplied. The inlet chamber 5 is at the same time designed as a mixing chamber for mixing the supplied engine exhaust gas and the supplied external heat as hot gas for the free-burning phase. Good mixing can be done e.g. B. by tangential introduction of one of the media, it can of course also be arranged flow-directing means in the inlet chamber 5 . The inlet funnel or the inlet chamber is flanged to the filter chamber 4 by means of a flange ( 9 ). The inlet chamber 5 can also be a section of the inlet funnel. On the outlet side, an outlet chamber 11 with an outlet funnel 12 adjoins the filter chamber 4 via a flange connection 10 , via which the cleaned exhaust gas flows out. The entire particle filter is protected against heat loss through radiation by an insulation 13 made of thermal insulation material.

The filter chamber 4 is delimited on the inlet side by the holding plate 2 and on the outlet side by the holding plate 3 . The filter candles 14 penetrating the filter space 4 are arranged in these holding plates 2, 3 . These consist of a filter core support tube 15 which is covered with filter material 16 . This assignment can be applied as a winding or in the form of individual knitted hoses. The filter support pipes 15 have exhaust gas passage openings 17 through which the exhaust gas or the exhaust gas / hot gas mixture can enter from the outside through the filter material 16 . The filter core support tubes 15 are closed on the inlet side and open on the outlet side. The supply of the exhaust gas or the exhaust gas / hot gas mixture - hereinafter only referred to as exhaust gas, whereby an exhaust gas / hot gas mixture is always understood for the free-burning phase - takes place according to FIG. 1 via exhaust gas passage openings 25 in the inlet-side holding plate 2 . The outlet-side holding plate 3 is formed in the two arrangements according to FIG. 1 without exhaust gas passage openings. According to FIG. 1 with the sections FIGS. 2 and 3, overflow pipes 18, 19 are also arranged in the two holding plates 2, 3 . These overflow pipes 18, 19 are closed on the outlet side. In the in Fig. 1 - lower half - illustrated embodiment, the overflow pipes are provided over their entire length with exhaust gas passage openings 20 and 18 have an inlet cuff 21. This is advantageous for the introduction of the exhaust gas into the overflow pipes 18 . The overflow tubes 18 and 19 are flowed through from the inside to the outside and conduct the hot exhaust gas to the filter candles 14 , in particular in the free-burning phase, whereby hot exhaust gas is also guided through the perforation of the overflow tubes 18, 19 to the lower region of the filter candles 14 , thereby causing a uniform free burning is achieved. In Fig. 1 - upper half - overflow pipes 19 are shown, which have exhaust gas outlet openings 21 only in their downstream area. Thus, in particular in the free-burning phase, the hot exhaust gas is fed into the downstream rear area of the filter space 4 and thus to the filter candles 14 , which leads to the fact that this area, which is not burned free in an arrangement without overflow pipes, is now free from soot particles by burning free is cleaned, which results in the desired long sooting time. The arrangement of the exhaust gas passage openings 21 in the downstream section of the overflow pipes 19 can take place progressively, ie a larger exhaust gas outlet area can be achieved at the end of the overflow pipe 19 . This can be achieved either by a progression of the number or the size of the exhaust gas outlet openings 20 . The overflow pipes 18, 19 are distributed over the cross section of the filter chamber 4 in such a way that the filter cartridges 14 are acted on as uniformly as possible, ie that the distance to the nearest filter cartridges 14 is short and in each case the same. Since the free internal profile without overflow tubes 18, 19 is approximately cone shape, the hot exhaust gas, the overcurrent tubes 18 can also for greater supply in the edge region of the filter space 4, 19 over the cross section of the filter chamber 4 distributes different diameters, namely, outside a larger diameter than the inside.

Due to the high thermal load during the free burning with temperatures in the order of <700 ° C and the uneven heat distribution over the filter chamber 4 (the filter core support tubes 15 have a different temperature than the overflow tubes 18, 19 due to the coating with filter material 16 ) occur differently Thermal expansion in the filter candles 14 and the overflow pipes 18, 19 . In the arrangements of FIGS. 1 to 7, the filter core support tubes 15 and the overflow tubes 18, 19 are therefore mounted alternately in the inlet-side holding plate 2 and the outlet-side holding plate 3 with a sufficiently tight sliding seat because of the risk of soot particles escaping.

In FIG. 4, with the sections Figs. 5 and 6, a further variant is shown, is disposed at the downstream of a further chamber 22. This is formed by an inserted floor 23 and, as a resonator chamber, contributes to better sound absorption of the particle filter, which is integrated in the exhaust line of a silencer system. The bottom 23 closes off the filter space 4 and, as in the previously described variants, is designed as a holding plate for the filter candles 14 and is provided with exhaust gas passage openings 24 . The overflow pipes 18, 19 open into the further chamber 22 , the filter core support pipes 15 penetrate this further chamber 22 and open-ended end in the outlet chamber 11 . A variant with smooth, non-perforated overflow pipes 19 is shown in the upper half of FIG. 4 and the associated sections FIGS. 5 and 6. In this embodiment, both the inlet-side holding plate 2 and the base 23, which acts as a holding plate for the overflow pipes 19 , are provided with exhaust gas passage openings 24 and 25 , respectively. In this embodiment, the exhaust gas flows partly through the exhaust gas passage openings 25 into the filter chamber 4 and from there through the filter candles 14 into the outlet chamber 11 , partly through the overflow pipes 19 into the chamber 22 and from there back through the exhaust gas passage openings 24 into the Filter chamber 14 and from there via the filter candles 14 .

A variant is shown in the lower half of FIG. 4 and the associated sections FIGS. 5 and 6, in which the overflow pipe 18 is open on both sides, has an inlet tulip 21 and exhaust gas outlet openings 20 on the inlet side. These exhaust gas outlet openings 20 are arranged over the entire length of the overflow pipe 18 , possibly with a progression downstream. In FIG. 5, lower half, the exhaust gas outlet openings are not shown 25th

FIG. 7 shows variants in which the overflow pipes 18, 19 of the previous figures are replaced by inflow pipes 26, 27 , which are designed as shortened overflow pipes. The other structure corresponds to the figures discussed above, in particular FIG. 1 with the associated sections according to FIGS. 2 and 3. In the upper half of FIG. 7, an exemplary embodiment is shown in which the exhaust gas from the inlet chamber 5 is partly over the exhaust gas passage openings 25 are fed to the filter chamber 4 and the other part via an inflow tube 27 , which is designed as a smooth tube open on both sides. The penetration depth of this inflow tube 27 extends to at least half of the filter space 4 . In the case of the inflow tubes 27 distributed over the cross section of the filter chamber 4 , the penetration depth can vary, however, in the edge zones the penetration depth continues downstream than e.g. B. in the tube arranged in the longitudinal axis or adjacent to the longitudinal axis.

A similar variant is shown in the lower half of FIG. 7, in which the inflow tube 27 has exhaust gas passage openings 28 and an inlet tulip 21 . On the inflow pipe 27 , an outlet-side cross-sectional reduction to an end piece 29 , which acts as a nozzle, is also shown, with which the inflow conditions can be improved if necessary.

In FIG. 6, exhaust gas through openings 30 optionally provided in the inlet-side holding plate 2 are shown in the edge region of the inflow into the filter space 4 .

All of the exemplary embodiments have in common that the exhaust gas to be cleaned is supplied to the filter chamber 4 equipped with filter candles 14 via the overflow pipes 18, 19 and the inlet pipes 26, 27 - additionally also through exhaust gas passage openings 25 in the inlet-side holding plate 2 - and that during which, when the engine is operating, allows a mixture of exhaust gas and hot gas, the latter from an external heat source or a burner attached, to be supplied. This enables an approximately uniform loading and free burning that extends over the entire length and the entire cross section of the particle filter. In particular, a long sooting phase is achieved by completely burning off the particle filter.

Claims (16)

1.Particle filters for cleaning the exhaust gas of internal combustion engines with filter candles, which are arranged in a housing provided with an inlet chamber and an outlet funnel between holding plates and are formed from a support tube provided with exhaust gas passage openings and covered with filter material and which additionally provide heat for the from a heat source Regeneration is supplied by free burning, characterized in that overflow pipes ( 18, 19 ) mounted in at least one holding plate ( 2, 3 ) distributed over the cross section of the housing ( 1 ) are arranged, and that the holding plate ( 2 ) on the inlet side is not in the Filter candle support pipes ( 15 ) and overflow pipes ( 18, 19 ) occupied area exhaust gas openings ( 25 ). 2. Particulate filter according to claim 1, characterized in that an overflow pipe ( 18 ) in the longitudinal axis of the housing and further overflow pipes ( 18 and 19 ) are arranged concentrically thereto, the number of overflow pipes ( 18, 19 ) per circle increasing to the outside . 3. Particulate filter according to claim 1 or 2, characterized in that a further chamber ( 22 ) is formed downstream by an inserted bottom ( 23 ) which is penetrated by the tubes ( 15 ) carrying the filter material ( 16 ) and open into the inlet side Overflow pipes ( 18, 19 ) open. 4. Particulate filter according to claim 1, 2 or 3, characterized in that a mixing chamber ( 5 ) is arranged in the flow direction upstream of the filter chamber ( 4 ) provided with filter candles ( 14 ) and overflow pipes ( 18, 19 ) as an inlet chamber. 5. Particulate filter according to one of claims 1 to 4, characterized in that the overflow pipes ( 18, 19 ) have exhaust gas passage openings ( 20 ) over at least part of their length. 6. Particulate filter according to claim 5, characterized in that the number of exhaust gas passage openings ( 20 ) increases downstream. 7. Particulate filter according to one of claims 1 to 6, characterized in that the inlet chamber ( 5 ) has at least one connection ( 6 or 7 ) for the engine exhaust gases to be cleaned and a connection ( 8 ) for the external supply of heat. 8. Particulate filter according to one of claims 1 to 6, characterized in that the inlet chamber ( 5 ) has a connecting flange ( 9 ) for a burner. 9. Particulate filter according to one of claims 1 to 8, characterized in that the bottom ( 23 ) used has exhaust gas passage openings ( 24 ). 10. Particulate filter according to one of claims 1 to 9, characterized in that the overflow pipes ( 18, 19 ) have different diameters. 11. Particulate filter according to one of claims 1 to 8 or 10, characterized in that in the inlet-side holding plate ( 2 ) in the area not occupied by filter core support tubes ( 15 ) in the filter space ( 4 ) projecting inflow tubes ( 26, 27 ) are arranged. 12. Particulate filter according to claim 11, characterized in that the inflow pipes ( 26, 27 ) project to different degrees into the filter space ( 4 ). 13. Particulate filter according to claim 11 or 12, characterized in that the inflow pipes ( 27, 28 ) have exhaust gas outlet openings ( 28 ). 14. Particulate filter according to one of claims 1 to 13, characterized in that inlet tulips ( 21 ) are integrally formed on at least some of the overflow tubes ( 18, 19 ) or the filter core support tubes ( 14 ). 15. Particulate filter according to one of claims 1 to 10, characterized in that both the filter core support tubes ( 14 ) and the overflow tubes ( 18, 19 ) are each mounted on one side in a sliding seat. 16. Particulate filter according to claim 15, characterized in that the filter core support tubes ( 14 ) and the overflow tubes ( 18, 19 ) alternately have a sufficiently tight sliding fit in the inlet-side holding plate ( 2 ) or the outlet-side holding plate ( 3 ).