DE20108405U1 - Device for cleaning the exhaust gases from diesel engines - Google Patents

Description

·" Patent attorneys

dlpl.-ing. f. w. minor · dipl.-ing. H. ch. bitter

AUTHORIZED REPRESENTATIVES BEFORE THE EUROPEAN PATENT OFFICE LANDAU/PFALZ

B/Co.

Heinrich Gillet GmbH & Co. KG ₁ 67480 Edenkoben

Device for cleaning the exhaust gases of diesel engines

CORRESPONDENCE OFFICE BANK DETAILS

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Description:

The invention relates to devices for cleaning the exhaust gases of diesel engines according to the preamble of claim 1.

If the exhaust gases from diesel engines are to be cleaned, soot filter systems and/or catalysts are required. The soot filters must be regularly regenerated and cleaned of ash. Regeneration takes place during operation, and ash cleaning takes place in the workshop.

For the purpose of cleaning in the workshop, it has proven to be optimal if the catalysts and the soot filters are designed as cartridges. Regeneration during operation requires additional measures. To regenerate the soot filters, the soot must be burned, which is achieved by supplying heat and/or catalytically active additives. Ammonia is required to reduce the nitrogen oxides in the catalysts, which is injected into the exhaust gas flow in the form of an aqueous urea solution.

Since space is limited under motor vehicles, it is common practice to integrate the soot filter and catalyst into the silencer housing. Care must be taken to ensure that the housings are not too large and bulky, that the pressure losses of the exhaust gases are not too high and that the mixing distance required for the evaporation of the urea solution is not too short.

The present invention is therefore based on the object of specifying an exhaust system in which the soot filter and catalyst are integrated into the silencer housing and at the same time the conditions just described are met.

•Ä · ■ ·

This object is achieved by a device having the features of claim 1.

Thanks to the fastening of the soot filter and/or catalyst cartridges in a partition wall and thanks to the positioning of this partition wall exactly at the separation point of the housing, all front surfaces of the cartridges are easily accessible for cleaning purposes. This significantly reduces working time in the workshop and improves the cleaning result.

The easy disassembly and assembly of the cartridges is supported by the gas-tight plug connection to the exhaust gas-carrying devices permanently housed in the housing, such as the inlet cone, outlet cone, intermediate pipes, etc.

Advantageously, the ends of the housing are widened in a V-shape in the area of the separation point and a V-band placed around the housing releasably connects the two housing parts. Such a V-band has the advantage that it pulls the two housing parts together, whereby the sealing rings between the cartridges and the exhaust gas-carrying devices are pressed together so that they can fulfil their sealing function.

Preferably, the partition wall is designed in such a way that it supports the housing against external pressure. This means that the housing always retains its shape, even at the separation point.

Advantageously, the front surface of the partition wall is V-shaped to match the ends of the housing and the V-band presses the housing ends against the partition wall. In this way, the required

Gas tightness is possible with a simple design of both the intermediate wall and the corresponding ends of the housing parts.

According to one embodiment of the invention, the sealing rings are designed as wire rings. Wire rings can sufficiently give way to the pressure that occurs when the housing is closed.

In order to secure the sealing rings against axial displacement, support rings are attached to the cartridges according to a further development of the invention.

According to a preferred embodiment of the invention, the housing is part of a silencer and the partition wall is acoustically active.

The invention will be explained in more detail in the form of an embodiment with reference to the drawing.

Fig. 1 shows a partial longitudinal section through a two-part housing in the area of the parting plane and

Fig. 2 shows a partial oblique view of an intermediate wall with soot filter and catalyst cartridge.

Fig. 1 shows a section of a two-part housing 1.1, 1.2, for example a silencer housing. A soot filter cartridge 10.1 and a catalyst cartridge 20.1 are integrated into the housing 1.1, 1.2.

Both cartridges 10.1, 20.1 are fastened, e.g. welded, in an intermediate wall 5. The intermediate wall 5 has passages of a suitable size.

In the area of the parting plane between the two housing halves 1.1, 1.2, the ends 7.1, 7.2 of the two housing parts are widened outwards in a V-shape. The front surface of the intermediate wall 5 is also V-shaped to match. This makes it possible to connect the two housing halves 1.1, 1.2 to the intermediate wall 5 with the help of a V-band 6 placed around it, whereby the mechanical strength and gas tightness are created in one assembly process.

Furthermore, inside the two-part housing 1.1, 1.2 you can see a first pipe 2, which feeds the exhaust gas coming from the diesel engine to the soot filter cartridge 10.1, another pipe 3, which diverts the exhaust gas exiting the soot filter cartridge 10.1 and feeds it to the catalyst cartridge 20.1, and finally a third pipe 4, which passes on the catalytically detoxified exhaust gas exiting the catalyst cartridge 20.1. To enable easy assembly and disassembly of the cartridges 10.1, 20.1, a plug connection is provided between the pipes 2, 3, 4 and the cartridges 10.1, 20.1. For this purpose, the ends of the pipes are widened to accommodate a sealing ring 11, 12, 21, 22. In order to secure these sealing rings 11, 12, 21, 22 against axial displacement, support rings 13, 23 are provided on the cartridges 10.1, 20.1. The sealing rings 11, 12, 21 are preferably at least partially elastic, for example in the form of wire mesh rings, and are placed under pressure when the housing 1.1, 1.2 is closed so that they can fulfill their sealing function.

Fig. 2 shows an oblique view of the partition wall 5, here with two parallel soot filter cartridges 10.1, 10.2 and two parallel catalyst cartridges 20.1, 20.2. It is understood that the number of parallel cartridges can be varied according to the size of the engine. The pipes 2, 3, 4 are indicated, which feed the diesel exhaust gas to the soot filter cartridges 10.1, 10.2, the filtered exhaust gas from the soot filter cartridges 10.1, 10.2 to the

Catalyst cartridges 20.1, 20.2 divert and finally pass on the exhaust gases exiting from the catalyst cartridges 20.1, 20.2. The pipe 4 that carries the exhaust gases away can be dispensed with if the unit consisting of partition wall 5 and cartridges 10.1, 10.2, 20.1, 20.2 is integrated into the housing of a silencer. Here, the exhaust gases exiting from the catalyst cartridges can flow directly into a chamber of the silencer.

If the intermediate wall 5 is additionally designed in such a way that it is acoustically active, for example by providing suitable perforations, the housing chamber which accommodates the deflection tubes 3 can also perform sound-damping tasks.

Claims (7)

1. Device for cleaning the exhaust gases of diesel engines, essentially comprising
a housing consisting of at least two parts ( 1.1 , 1.2 ),
therein at least one soot filter cartridge ( 10.1 , 10.2 ) and/or at least one catalyst cartridge ( 20.1 , 20.2 )
and means ( 2 , 3 , 4 ) for guiding the exhaust gases into, between and out of the cartridges ( 10 , 1 , 10.2 , 20.1 , 20.2 ),
the housing ( 1.1 , 1.2 ) can be opened so that the cartridges ( 10.1 , 10.2 , 20.1 , 20.2 ) are accessible for cleaning, characterized by the features:
the cartridges ( 10.1 , 10.2 , 20.1 , 20.2 ) are fixed in an intermediate wall ( 5 ),
Sealing rings ( 11 , 12 , 21 , 22 ) ensure a gas-tight connection between the cartridges ( 10.1 , 10.2 , 20.1 , 20.2 ) and the exhaust gas-carrying devices ( 2 , 3 , 4 ),
a parting plane of the housing ( 1.1 , 1.2 ) is located in the area of the intermediate wall ( 5 ). 2. Device according to claim 1, characterized by the features:
the ends ( 7.1 , 7.2 ) of the housing ( 1.1 , 1.2 ) in the area of the parting plane are widened in a V-shape,
a V-band ( 6 ) connects the two housing parts ( 1.1 , 1.2 ). 3. Device according to one of claims 1 to 3, characterized by the feature:
the intermediate wall ( 5 ) supports the housing ( 1.1 , 1.2 ) against external pressure. 4. Device according to claim 2 or 3, characterized by the feature:
the front surface of the intermediate wall ( 5 ) is V-shaped to match the ends ( 7.1 , 7.2 ) of the housing ( 1.1 , 1.2 ),
the V-band ( 6 ) presses the housing ends ( 7.1 , 7.2 ) against the intermediate wall ( 5 ). 5. Device according to one of claims 1 to 4, characterized by the feature:
the sealing rings ( 11 , 12 , 21 , 22 ) are wire rings. 6. Device according to claim 5, characterized by the feature:
Support rings ( 13 , 23 ) secure the sealing rings ( 11 , 12 , 21 , 22 ) against axial displacement. 7. Device according to one of claims 1 to 6, characterized by the features:
the housing ( 1.1 , 1.2 ) is part of a silencer,
the partition wall ( 5 ) is acoustically active.