DE102005025738A1 - exhaust aftertreatment device - Google Patents

Abstract

The invention discloses an exhaust aftertreatment device (10), in particular for diesel engines of commercial vehicles. The exhaust aftertreatment device (10) includes a housing (12); an exhaust gas inlet port (14) and an exhaust gas outlet port (16) provided on the housing (12); at least one in the housing (12) arranged exhaust gas cleaning element (18), the gas inlet guide with the exhaust gas inlet port (14) of the housing (12) and the gas outlet guide with the exhaust gas outlet port (16) of the housing (12) is in fluid communication. The exhaust gas outlet connection (16) is connected to the interior of the housing (12) via an exhaust pipe (24), the end of the exhaust pipe (24) facing away from the exhaust gas outlet connection (16) with the gas outlet guide of the at least one exhaust gas cleaning element (18) via a riser pipe section (FIG. 22) of the exhaust pipe (24) or via a riser chamber (20d) is in fluid communication, so that even with a relatively low mounted on the vehicle exhaust outlet port (16) without further measures the penetration of water into the housing (12) is avoided.

Description

The The present invention relates to an exhaust aftertreatment device according to the preamble of claim 1, and in particular such an exhaust aftertreatment device for use with diesel engines, especially commercial vehicles.

at Diesel engines, especially for commercial vehicles, do not come Recently, due to new legislation increased exhaust aftertreatment devices used instead of pure exhaust mufflers as well Catalysts and particulate filter include.

Such an exhaust aftertreatment device is for example in the DE 101 40 295 A1 described. This known exhaust aftertreatment device, which forms the basis for the preamble of claim 1, has a housing with an exhaust gas inlet connection and an exhaust gas outlet connection as well as a plurality of catalyst modules arranged parallel in the housing. The housing includes a plurality of intermediate walls for forming chambers. The catalyst modules are passed through the intermediate walls and each contain a plurality of sections with different catalyst elements, which are positioned in the individual chambers. The exhaust gas flowing into a first chamber of the housing via the exhaust gas inlet connection is introduced into the first sections of the catalyst modules by appropriate gas inlet ducts and finally led via corresponding gas outlet ducts from the last sections of the catalytic converter modules into a final chamber of the housing which communicates with the exhaust gas outlet connection for outputting In general, for commercial vehicles, the possibility of water traversal, a Spritzwasserbeaufschlagung, cleaning in car washes, cleaning by steam jet and the like is required. While penetration of water was not a problem in the previously used clean exhaust mufflers, such water ingress is detrimental to the internal components of the exhaust aftertreatment device described above.

One approach to avoid entry of water into the interior of the exhaust aftertreatment device consists in the exhaust aftertreatment device at a relative high point on the vehicle to install or the exhaust outlet connection via a Pipe connection to lead to a relatively high place on the vehicle. These activities Depending on the type of vehicle, however, these are not always possible and require additional support Components and are more complex to install or are unfavorable because of the exhaust gas outlet Avoid spots on the vehicle.

Of the The present invention is therefore based on the object, an exhaust aftertreatment device provide, without further action Entry of water into the interior is prevented or at least made much more difficult.

These Task is done according to a First aspect by an exhaust aftertreatment device with the Characteristics of claim 1 solved. Advantageous embodiments and further developments of the invention are Subject of the dependent Claims.

The Exhaust after-treatment device includes a housing; an exhaust gas inlet connection and an exhaust gas outlet port provided on the housing are; and at least one exhaust gas purification element disposed in the housing, its gas inlet guide is in fluid communication with the exhaust gas inlet port of the housing and its gas outlet guide is in fluid communication with the exhaust gas outlet port of the housing. According to the invention Exhaust outlet connection via a Exhaust pipe to the interior of the housing connected, wherein the exhaust gas outlet port facing away from the end the exhaust pipe with the gas outlet guide of the at least one Exhaust gas purification element is in fluid communication and the exhaust pipe having a riser section.

By the riser section of the connected to the exhaust gas outlet port Exhaust pipe prevents water from entering the interior of the housing or at least significantly more difficult, even if the exhaust aftertreatment device mounted at a location on the vehicle, for example, at a Water crossing or cleaning the vehicle exposed to water is. The height The upper end of the riser section naturally determines the wading depth of the vehicle.

Preferably the riser section extends substantially to the top of the housing, so that the upper end of the riser section is positioned as high as possible.

Of the Riser section can be oriented substantially vertically or obliquely be and are essentially straightforward or simple or curved several times be educated.

The above object is achieved according to a second aspect by an exhaust aftertreatment device having the features of claim 7. Advantageous embodiments and modifications of the invention are the subject of the dependent claims.

The Exhaust after-treatment device includes a housing; an exhaust gas inlet connection and an exhaust gas outlet port provided on the housing are; and at least one exhaust gas purification element disposed in the housing, its gas inlet guide is in fluid communication with the exhaust gas inlet port of the housing and its gas outlet guide is in fluid communication with the exhaust gas outlet port of the housing. According to the invention Exhaust outlet connection via a Exhaust pipe to the interior of the housing connected, the exhaust gas outlet port facing away from the end of the exhaust pipe stands with a housing chamber in fluid communication, in turn via fluid connections with the Gas exit guide the at least one exhaust gas purification element in fluid communication stands, and the fluid connections are only above a certain Height of housing intended.

By The riser thus formed can indeed water into the interior of the housing, not but get into the exhaust gas purification elements, even if the exhaust aftertreatment device mounted at a location on the vehicle, for example, at a Water crossing or cleaning the vehicle exposed to water is. The height The lowest fluid connection of the riser naturally determines the wading depth of the vehicle. The riser construction of the second aspect offers over the Version with riser section also has an advantage that once in the case simply penetrated water through the exhaust pipe and the Exhaust gas outlet connection can flow out of the riser chamber.

Preferably the fluid connections are only in the substantially upper area of the housing intended.

The Fluid connections can for example, through holes or perforations in a partition wall of the housing chamber and / or pipe connections between the housing chamber and the gas outlet guide of the at least one exhaust gas purification element.

The at least one exhaust gas purification element is at least in the range the riser chamber with a thermal insulation jacketed to a thermal shock of the exhaust gas purification element to prevent by penetrating water.

In An embodiment of the invention is the exhaust gas outlet connection horizontally, vertically down or at an angle down out of the case guided.

In A preferred embodiment of the invention are in the housing more Provided exhaust gas cleaning elements, their gas outlet guides each with the exhaust gas outlet port facing away from the Gas pipe are in fluid communication.

In In another embodiment of the invention, the gas outlet guide (s) of the Exhaust gas purification element or the exhaust gas purification elements in a common chamber in the housing, with the end of the exhaust pipe facing away from the exhaust gas outlet connection is in fluid communication.

In a still further embodiment of the invention contains the at least an exhaust gas purification element at least one catalyst element and / or at least one filter element, and the housing with the at least one Exhaust gas purification element and the exhaust pipe also has a sound damping function.

Above and other features and advantages of the invention will become apparent from the following description of preferred, non-limiting embodiments of the invention with reference to the accompanying drawings better understandable. Show:

1 a schematic perspective view of an exhaust aftertreatment device according to a first preferred embodiment of the present invention, with an "open"housing;

2 a schematic perspective view of an exhaust aftertreatment device according to a second preferred embodiment of the present invention, with an "open"housing;

3 a schematic representation for explaining the mounting position of the exhaust gas aftertreatment device according to the invention on a vehicle; and

4 a schematic perspective view of an exhaust aftertreatment device according to a third preferred embodiment of the present invention, with an "open" housing.

Based on 1 to 4 Various embodiments of an exhaust aftertreatment device according to the invention will now be explained tert, wherein the same components and components are each identified by the same reference numerals.

The Exhaust after-treatment device is on a diesel engine applied to a commercial vehicle without the invention to this Use limited is.

1 . 2 and 4 each show an exhaust aftertreatment device 10 with a watertight case 12 whose shell is omitted in the drawings to the structure in the interior of the exhaust aftertreatment device 10 to be able to represent. The housing 12 owns (left in 1 . 2 and 4 ) an exhaust gas inlet connection 14 , which is connected via an exhaust pipe (not shown) with the exhaust manifold of the diesel engine (not shown), and (bottom right in 1 . 2 and 4 ) an exhaust gas outlet connection 16 which is directly or optionally connected to the environment via another pipeline.

The housing 12 is through partitions 17a -c in several chambers 20a -d split. In the case 12 are also a plurality of mutually parallel tubular exhaust gas cleaning elements 18 provided with their respective sections through the intermediate walls 17a -c sealed are guided through. These exhaust gas purification elements 18 consist of several sections that contain different catalyst elements and / or filter elements for cleaning the exhaust gases flowing through them.

The through the exhaust gas inlet connection 19 inflowing exhaust gases first enter a (left) input chamber 20a coming from the case 12 and the first partition 17a is limited, and flow from there through corresponding gas inlet guides in the first sections of the plurality of exhaust gas purification elements 18 , which is the first partition 17a punctured. After flowing through all sections of the plurality of exhaust gas purification elements 18 The cleaned exhaust gases pass through appropriate gas outlet guides into the (right) outlet chamber 20b out from the case 12 and a second partition 17b is limited.

As in 1 . 2 and 4 is shown in the housing 12 another partition 17c provided by the first and the second partition wall 17a . 17b limited space in two more chambers 20c and 20d divides. In contrast to the first partition 17a is the second partition 17b with punctures 29 , Perforations or the like, so that through the exhaust gas purification elements 18 passed exhaust gases from the output chamber 20b in the neighboring chamber 20c reach. From this chamber 20c can clean the exhaust gases through holes 28 , Perforations or the like in the third partition 17c in the last chamber 20d flow, from which they finally via the exhaust outlet connection 16 out of the case 12 stream.

It should be expressly noted at this point that the present invention does not apply to an exhaust aftertreatment device having such an arrangement of partitions 17a -c, chambers 20a -d and exhaust gas purification elements 18 is limited, but rather that the arrangements and the number of exhaust gas purification elements 18 and the chambers 20 in the case 12 basically can be arbitrary.

The exhaust outlet connection 16 of the housing 12 protrudes in the first embodiment of 1 vertically down while in the in 2 illustrated second embodiment horizontally from the housing 12 runs. In the context of the present invention, the exhaust gas outlet connection 16 but of course also at an angle down from the case 12 be guided. In addition, the position of the exhaust outlet connection 16 not on the in 1 and 2 shown limited.

The exhaust outlet connection 16 is directly connected to the environment in the embodiments shown here, so that the purified exhaust gases are discharged at this point to the environment. Optionally, it is also possible, the exhaust outlet connection 16 to connect with another pipe element to direct the cleaned exhaust gases, for example, from the left side of the vehicle to the right side of the vehicle or vice versa. However, this further tubular element is usually not guided to a higher position on the vehicle. In addition, optionally a water-compatible rear silencer may be integrated in this further tubular element, if necessary.

As in 1 and 2 illustrates is the exhaust outlet connection 16 over an exhaust pipe 24 with the interior of the case 12 connected. More precisely, this is the exhaust gas outlet connection 16 opposite end of this exhaust pipe 24 with the last chamber 20d , in which the purified exhaust gases from the exhaust gas purification elements 18 be issued, in fluid communication. For this purpose, the exhaust pipe 24 for example, directly into this last chamber 20d protrude or protrude into another chamber with the aforementioned last chamber 20d is in fluid communication.

In the first and second embodiments, the exhaust pipe includes 24 a riser section 22 which prefers close to the top of the housing 12 extends so that the upper end of the This riser section 22 positioned as high as possible. This riser section 22 of the exhaust pipe 24 Prevents or at least significantly hinders the penetration of water into the interior of the housing 12 For example, in a water crossing, a Spritzwasserbeaufschlagung, a cleaning in car washes, a cleaning by steam jet and the like of the vehicle to which the exhaust aftertreatment device 10 is mounted. The vehicle operation remains despite partially filled exhaust pipe 24 or riser section 22 possible because the exhaust pressure of the engine is higher than the hydrostatic pressure of the rising water.

As in 3 In this way, for example, the wath height w of the vehicle can be approximately up to the height of the frame 26 be increased, which is sufficient in most cases, although the gas outlet connection 16 the exhaust aftertreatment device 10 as usual, much lower. In addition, to prevent the ingress of water into the interior of the housing 12 the exhaust aftertreatment device 10 none to the exhaust gas outlet connection 16 connected piping, which is led to a higher point on the vehicle, and also the exhaust aftertreatment device 10 itself does not have to be mounted at a higher point on the vehicle.

In addition to the exhaust gas cleaning function by the exhaust gas purification elements 18 owns the exhaust aftertreatment device 10 through the housing 12 , the exhaust gas purification elements 18 and the exhaust pipe 24 in a known manner, an exhaust noise attenuation effect, so that no further sound attenuation elements are necessary.

In the two embodiments of 1 and 2 is the riser section 22 formed in a straight line and aligned vertically. In addition, the riser section 22 at the end of the exhaust pipe 22 provided so that the end of the riser section 22 with the end of the exhaust pipe 24 coincides. However, the present invention is not limited to this embodiment of the exhaust pipe 24 or the riser section 22 limited.

For example, the riser section needs 22 not necessarily be vertically aligned, it should only extend over a certain vertical height to fulfill the function of the invention. In addition, the riser section must 22 not necessarily be rectilinear, but instead may also be single or multiple curved.

Furthermore, may be at the upper end of the riser section 22 yet another pipe section of the exhaust pipe 24 connect, which in principle can run arbitrarily, ie even back down. By an extended in this way exhaust pipe 24 can the sound damping properties of the exhaust aftertreatment device 10 be further improved.

This in 4 illustrated third embodiment differs from the two embodiments of 1 and 2 in that instead of the riser section 22 of the exhaust pipe 24 one with the exhaust pipe 24 Connected riser is provided.

As in 4 Illustrated, this riser is through the last chamber 20d of the housing 12 passing through the first and the third partition wall 17a . 17c is limited, formed.

That with the exhaust gas outlet connection 16 of the housing 12 connected exhaust pipe 24 does not have a riser section in this case 22 but ends already in the lower part of the riser 20d , It is thus a water entry into this riser 20d for example, even at lower watt depths w possible. To prevent that from entering the case 12 Penetrated water also in the exhaust gas purification elements 18 and possibly damaged, are the perforations or perforations 28 in the third partition 17c only above a certain minimum height of the housing 12 , ie preferably only in the upper region of the housing 12 educated. The wading depth w is thus in this case by the height of the lowest perforations or perforations 28 certainly.

Although in the embodiment of 4 the punctures 29 in the second partition 17b are distributed over the entire housing height, it is also possible that the through holes 29 in the second partition 17b are formed only above a certain minimum height. In this way, a buffer chamber 20c are formed, which, if the vehicle only a short time exceeds the wading depth w, a penetration of water into the output chamber 20b and thus in the exhaust gas purification elements 18 can prevent.

As in 4 indicated, the fluid connections between the riser 20d and the exit chamber 20b alternatively or additionally by pipe connections 30 be formed, of course, also only in the upper part of the riser 20d may be arranged.

As in the case of this third embodiment, water more easily into the housing 12 can penetrate, should the exhaust gas cleaning elements 18 at least in the area of the riser chamber 20d be coated with a thermal insulation (not shown) to damage the exhaust gas purification elements 18 due to thermal shock when in contact with to prevent urgent water.

A particular advantage of the embodiment of 4 is that once in the riser 20d easily penetrated water through the exhaust pipe again 24 and the exhaust outlet connection 16 can drain away. Case in the embodiments of 1 and 2 despite the riser section 22 Water into the housing 12 should penetrate, this can be discharged only by evaporation again.

Claims (16)

Exhaust aftertreatment device ( 10 ), with a housing ( 12 ); an exhaust gas inlet connection ( 14 ) and an exhaust gas outlet connection ( 16 ) attached to the housing ( 12 ) are provided; at least one in the housing ( 12 ) arranged exhaust gas purification element ( 18 ), whose gas inlet guide with the exhaust gas inlet connection ( 14 ) of the housing ( 12 ) and its gas outlet guide with the exhaust gas outlet connection ( 16 ) of the housing ( 12 ) is in fluid communication, characterized in that the exhaust gas outlet connection ( 16 ) via an exhaust pipe ( 24 ) with the interior of the housing ( 12 ) connected is; that the exhaust gas outlet ( 16 ) facing away from the end of the exhaust pipe ( 24 ) with the gas outlet guide of the at least one exhaust gas purification element ( 18 ) is in fluid communication; and that the exhaust pipe ( 24 ) a riser section ( 22 ) having. Exhaust after-treatment device according to claim 1, characterized in that the riser section ( 22 ) substantially to the top of the housing ( 12 ). Exhaust after-treatment device according to claim 1 or 2, characterized in that the riser section ( 22 ) is oriented substantially vertically. Exhaust after-treatment device according to claim 1 or 2, characterized in that the riser section ( 22 ) is oriented obliquely. Exhaust after-treatment device according to one of claims 1 to 4, characterized in that the riser section ( 22 ) is substantially rectilinear. Exhaust after-treatment device according to one of claims 1 to 4, characterized in that the riser section ( 22 ) is formed simply curved or multiple times. Exhaust aftertreatment device ( 10 ), with a housing ( 12 ); an exhaust gas inlet connection ( 14 ) and an exhaust gas outlet connection ( 16 ) attached to the housing ( 12 ) are provided; at least one in the housing ( 12 ) arranged exhaust gas purification element ( 18 ), whose gas inlet guide with the exhaust gas inlet connection ( 14 ) of the housing ( 12 ) and its gas outlet guide with the exhaust gas outlet connection ( 16 ) of the housing ( 12 ) is in fluid communication, characterized in that the exhaust gas outlet connection ( 16 ) via an exhaust pipe ( 24 ) with the interior of the housing ( 12 ) connected is; that the exhaust gas outlet connection ( 16 ) facing away from the end of the exhaust pipe ( 24 ) with a housing chamber ( 20d ) is in fluid communication, which in turn via fluid connections ( 28 . 30 ) with the gas outlet guide of the at least one exhaust gas purification element ( 18 ) is in fluid communication; and that the fluid connections ( 28 . 30 ) only above a certain height of the housing ( 12 ) are provided. Exhaust after-treatment device according to claim 7, characterized in that the fluid connections ( 28 . 30 ) only in the substantially upper area of the housing ( 12 ) are provided. Exhaust after-treatment device according to claim 7 or 8, characterized in that the fluid connections ( 28 ) Holes in a partition wall ( 17c ) of the housing chamber ( 20d ) are. Exhaust after-treatment device according to one of claims 7 to 9, characterized in that the fluid connections ( 30 ) Pipe connections between the housing chamber ( 20d ) and the gas outlet guide of the at least one exhaust gas purification element ( 18 ) are. Exhaust after-treatment device according to one of claims 7 to 10, characterized in that the at least one exhaust gas purification element ( 18 ) at least in the region of the housing chamber ( 20d ) is jacketed with a thermal insulation. Exhaust after-treatment device according to one of the preceding claims, characterized in that the exhaust gas outlet connection ( 16 ) horizontally, vertically downward or at an angle down from the housing ( 12 ) is guided. Exhaust after-treatment device according to one of the preceding claims, characterized in that in the housing ( 12 ) several exhaust gas purification elements ( 18 ) are provided, the gas outlet guides each with the exhaust gas exit port ( 16 ) facing away from the end of the gas pipe ( 24 ) are in fluid communication. Exhaust gas aftertreatment device according to one of the preceding claims, characterized in that the gas outlet guide (s) of the exhaust gas purification element or the exhaust gas purification elements ( 18 ) into a common chamber ( 20c ) in the housing ( 12 ) opens with the exhaust gas outlet connection ( 16 ) facing away from the end of the exhaust pipe ( 24 ) is in fluid communication. Exhaust after-treatment device according to one of the preceding claims, characterized in that the at least one exhaust gas purification element ( 18 ) contains at least one catalyst element and / or at least one filter element. Exhaust after-treatment device according to one of the preceding claims, characterized in that the housing ( 12 ) with the at least one exhaust gas purification element ( 18 ) and the exhaust pipe ( 24 ) further has a silencing function.