DE102020128707B3 - Fluid guide device with a fluid guide body - Google Patents

Abstract

A fluid guide device (20) for exhaust gas aftertreatment has a fluid guide body (30) with guide vanes (33), which fluid guide body (30) has a combustion chamber part (31) and a cover part (32), which combustion chamber part (31) has a cover shape with a combustion chamber part - bottom section (311) and a combustion chamber part edge section (312), which cover part (32) is designed in the shape of a cover with a cover part bottom section (321) and a cover part edge section (322), which combustion chamber part bottom section (311) is a combustion chamber part - Inflow opening (313) and which cover part bottom section (321) have a cover part inflow opening (323), which together form a fluid guide body inflow opening (303), which guide vanes (33) on an outer side (319) of the combustion chamber part bottom section (311 ) are provided, and which cover part (32) on the outside (319) of the combustion chamber part (31) is arranged such that between the vanes (33) flow ducts (339) are formed, which enable a first fluid flow (101) inside the fluid guide body (30) in order to allow the first fluid flow (101) to mix in the region of the fluid guide body inflow opening (303) with a fluid flowing through the fluid guide body inflow opening (303 ) to allow incoming second fluid flow (102).

Description

The invention relates to a fluid guide device with a fluid guide body.

the EP 2 983 809 B1 shows an engine exhaust system with a curved exhaust pipe, an injector and a vane for directing the flow of exhaust gas.

the DE 11 2018 002 876 T5 shows a multi-stage mixer with main guide vanes and main guide vane openings.

the DE 35 36 315 C2 shows a catalyst arrangement with a guide body,

the DE 10 2016 102 020 A1 shows a mixer device with gas guide vanes, in which a gas flow is impinged with a swirl.

the EP 2 659 101 B1 shows a device for distributing fluids in exhaust systems of an internal combustion engine.

the EP 2 625 398 B1 shows an arrangement for introducing a liquid medium, for example urea, into exhaust gases from an internal combustion engine, which arrangement has flow guide means.

the DE 10 2017 105 093 A1 shows a mixer device with an overflow pipe.

the DE 10 2019 112 911 B3 shows a guide grid for an exhaust gas burner of a motor vehicle, which guide grid is formed from at least two layers, the two layers having different thermal expansions in at least one defined direction.

the EP 2 884 175 A1 shows a combustor with a tubular inner section and a tubular outer section, wherein fuel is mixed with air in the inner section.

It is an object of the invention to provide a new fluid guide device with a fluid body.

The object is solved by the subject matter of claim 1.

A fluid guide device for exhaust gas aftertreatment has a fluid guide body with guide vanes, which fluid guide body has a combustion chamber part and a cover part, which combustion chamber part is designed in the shape of a cover with a combustion chamber part base section and a combustion chamber part edge section, which cover part is cover-shaped with a cover part base section and a cover part edge section is formed, which combustion chamber part bottom section has a combustion chamber part inflow opening and which cover part bottom section has a cover part inflow opening, which together form a fluid guide body inflow opening, which guide vanes are provided on an outside of the combustion chamber part bottom section, and which cover part is on the outside the combustion chamber part is arranged in such a way that flow channels are formed between the guide vanes, which enable a first fluid flow inside the fluid guide body, which first fluid flow runs from outside the fluid guide body through the area between the combustion chamber part edge section and the cover part edge section, then through the flow channels to the area between the combustion chamber part inflow opening and the cover part inflow opening and from there into the fluid guide body inflow opening to in the area the fluid guide body inflow opening to allow mixing of the first fluid stream with a second fluid stream entering through the fluid guide body inflow opening. The design enables an advantageous supply of the first fluid flow within the fluid guide body and an advantageous mixing with a second fluid flow.

According to a preferred embodiment, the combustion chamber part and the guide vanes are designed in several pieces and joined by a joint connection, in particular by a welded connection or soldered connection. This allows for easier manufacture of the vanes and combustor portion.

According to a preferred embodiment, the combustion chamber part or the cover part or both the combustion chamber part and the cover part have recesses into which the guide vanes extend at least in regions. This makes it easier to join the individual parts and increases stability.

According to a preferred embodiment, the guide vanes have projections which extend into the recesses. This gives a good seat of the guide vanes.

According to a preferred embodiment, the cover part has indentations on the inside in the region of the cover part base section, into which the guide vanes extend at least in regions. The relative arrangement of the cover part and the combustion chamber part is thereby well defined, and the indentations can be used for the solder during a soldering process.

According to a preferred embodiment, the guide vanes are at least partially connected to the cover part in the area of the depressions. This creates a stable connection.

According to a preferred embodiment, the combustion chamber part and the guide vanes are designed in one piece. This saves a joining process in this area.

According to a preferred embodiment, the guide vanes extend at least partially up to the combustion chamber part inflow opening. This enables a fluid flow to be guided up to the inflow opening and reduces the risk of the fluid flow becoming detached with the resulting turbulence.

According to a preferred embodiment, the guide vanes have a first guide vane end, a middle region and a second guide vane end, the first guide vane end being arranged closer to the fluid guide body inflow opening than the second guide vane end. From the basic type, this results in a radial blade geometry.

According to a preferred embodiment, the guide vanes are at least partially wider in the central region in some areas than at the first guide vane end in order to bring about a nozzle effect.
According to a preferred embodiment, the guide vanes are at least partially wider in the middle area than at the second guide vane end in order to bring about a nozzle effect.
The mixing of the first fluid flow with the second fluid flow can be improved by the nozzle effect.

According to a preferred embodiment, the guide vanes at the first guide vane end run obliquely to the radial direction relative to the fluid guide body inflow opening. A purely radial orientation of the guide vanes is possible, but an oblique course, in which there is an angle between the radial direction and the orientation of the guide vanes, is advantageous for the mixing of the first fluid stream with the second fluid stream.

According to a preferred embodiment, the fluid guide device has an annular inflow opening guide part, which inflow opening guide part has a through-opening for a second air flow, extends into the area of the cover part through-opening and forms a guiding surface there for the first fluid flow. Such a guide part can be manufactured with high accuracy, and the guide surface extends the wall-guided line of the fluid flow.

According to a preferred embodiment, the combustion chamber part bottom section is at least partially convex on the outside. The convex design enables the fluid flow to be guided in an optimized manner and reduces the risk of fluid flow separation. The bottom section of the combustion chamber part is preferably concave at least in some areas on the inside. This is an advantageous shape for the combustion chamber.

According to a preferred embodiment, the cover part base section is concave at least in certain areas on the inside. The concave design enables the fluid flow to be guided in an optimized manner towards the combustion chamber and reduces the risk of fluid flow separation. Preferably, the combustion chamber part bottom section is convex at least in some areas on the outside. This allows other fluids to be directed past the outside without turbulence.

• - Druckteil,
• - Pressteil,
• - Tiefziehteil,
• - Sinterteil, oder
• - Gussteil.

According to a preferred embodiment, the combustion chamber part and the cover part are each manufactured as

• - pressure part,
• - pressed part,
• - deep-drawn part,
• - Sintered part, or
• - casting.

A design that is advantageous for combustion chamber operation is possible as a result of these configurations.

• - Stahl,
• - Aluminium,
• - Aluminiumlegierung,
• - Nickel,
• - Nickellegierung,
• - Keramik, und
• - kunststoffhaltiger Sinterwerkstoff.

According to a preferred embodiment, the combustion chamber part or the cover part has at least one material from the group of materials consisting of:

• - Stole,
• - aluminum,
• - aluminum alloy,
• - nickel,
• - nickel alloy,
• - ceramics, and
• - Sintered material containing plastic.

These materials are also suitable for formation at high temperatures. Nickel, nickel alloys and ceramics are particularly suitable for the combustion chamber part.

According to a preferred embodiment, the inside of the combustion chamber part defines a region of a combustion chamber. Thus, no additional transition to the combustion chamber is required, and this increases stability and leads to less failure in manufacture.

According to a preferred embodiment, the fluid conducting device has an injection valve which is positioned relative to the fluid conducting body in such a way that it allows a second fluid flow from the outside of the fluid conducting body through the fluid conducting body inflow opening to the inside of the fluid conducting body. This enables an advantageous use of the fluid guide body, and the first fluid flow and the second fluid flow can be well mixed with one another.

• 1 in einem schematischen Längsschnitt eine Fluidleitvorrichtung mit ein Fluidleitkörper,
• 2 in einem Längsschnitt den Fluidleitkörper von 1 mit einem Brennkammerteil und einem Deckelteil,
• 3 in einer Explosionsdarstellung den Fluidleitkörpervon 1,
• 4 in raumbildlicher Darstellung eine Ausführungsform des Brennkammerteils von 2,
• 5 in raumbildlicher Darstellung eine weitere Ausführungsform des Brennkammerteils von 2,
• 6 in raumbildlicher Darstellung die Unterseite des Brennkammerteils von 4,
• 7 in raumbildlicher Darstellung eine Ausführungsform des Deckelteils von 2,
• 8 in raumbildlicher Darstellung eine weitere Ausführungsform des Deckelteils von 2, und
• 9 in raumbildlicher Darstellung die Unterseite des Deckelteils von 8.

Further details and advantageous developments of the invention result from the exemplary embodiments described below and illustrated in the drawings, which are in no way to be understood as limiting the invention, and from the dependent claims. It shows

• 1 in a schematic longitudinal section, a fluid guide device with a fluid guide body,
• 2 in a longitudinal section the Fluidleitkörper from 1 with a combustion chamber part and a cover part,
• 3 in an exploded view the Fluidleitkörpervon 1 ,
• 4 in a three-dimensional representation of an embodiment of the combustion chamber part of 2 ,
• 5 in a three-dimensional representation of a further embodiment of the combustion chamber part of 2 ,
• 6 in spatial representation the underside of the combustion chamber part of 4 ,
• 7 in a three-dimensional representation of an embodiment of the cover part of 2 ,
• 8th in a three-dimensional representation of a further embodiment of the cover part of 2 , and
• 9 in spatial representation the underside of the cover part of 8th .

In the following, parts that are the same or have the same effect are provided with the same reference symbols and are usually only described once. The description builds on one another across figures in order to avoid unnecessary repetition.

1 shows a fluid guide device 20, which allows different fluid flows 101, 102 and 103. Fluids can be gases and/or liquids, for example exhaust gases and fuels. A valve inlet 24 allows for the delivery of an exhaust fluid flow. An injector nozzle 23 allows a flow of fluid 102 to be injected into a combustion chamber 22 and an outlet 26 allows a flow of fluid 103 out of the combustion chamber 22 . A fluid guide body 30 is provided, and the first fluid flow 101 can be guided via this into the outlet region of the injection nozzle 23 in order to cause the first fluid flow 101 to be mixed with the second fluid flow 102 . An igniter 25 is provided to cause ignition in the combustion chamber 22 .

In the exemplary embodiment, the fluid guide device 20 described serves as an exhaust gas burner or exhaust gas aftertreatment device. In the exemplary embodiment, the exhaust gas is routed from the valve inlet 24 to the right and then routed back along the combustion chamber 22 to the left in order to cool the combustion chamber 22 .

2 shows a longitudinal section through the fluid guide body 30. The fluid guide body 30 has a combustion chamber part 31, a cover part 32 and guide vanes 33.

Combustion chamber part 31 is designed in the form of a cover with a combustion chamber part bottom section 311 and a combustion chamber part edge section 312 and defines an area of combustion chamber 22 on the inside 318.

The cover part 32 is in the form of a cover with a cover part bottom section 321 and a cover part edge section 322 . The term base section does not imply a specific position, but rather defines the corresponding part of the lid-shaped part.

Combustion chamber part floor section 311 forms a combustion chamber part inflow opening 313, and cover part floor section 321 forms a cover part inflow opening 323. Combustion chamber part inflow opening 313 and cover part inflow opening 323 together form a fluid guide body inflow opening 303. This fluid guide body inflow opening 303 allows the delivery of the second fluid stream 102 from 1 through the fluid guide body inflow opening 303.

An annular inflow opening guide part 35 is provided, which has a passage opening 351 for the second air flow 102, which extends into the area of the cover part passage opening 323 and forms a guide surface 352 there for the first fluid flow 101.

The combustion chamber part 31 has an inner side 318 and an outer side 319. The cover part 32 has an inner side 328 and an outer side 329. The fluid guide body 30 has an inner side 308 and an outer side 309. The combustion chamber part base section 311 has a plurality of guide vanes 33 on its outer side 319. The cover part 32 is arranged on the outside 319 of the combustion chamber part 31 in such a way that the guide vanes 33 are arranged between the combustion chamber part 31 and the cover part 32 . Flow channels 339 are formed between the guide vanes 33 and enable the first fluid flow 101 in the interior of the fluid guide body 30 . The first fluid stream 101 can enter the fluid guide body 30 from outside the fluid guide body 30 through the area 305 between the combustion chamber part edge section 312 and the cover part edge section, then through the flow channels 339 to the area 306 between the combustion chamber part inflow opening 313 and the cover part Flow inflow opening 323 and from there get into the fluid guide body inflow opening 303. In the region of the fluid guide body inflow opening 303, this enables the first fluid flow 101 to be mixed with the second fluid flow 102 entering through the fluid guide body inflow opening 303.

Combustion chamber part bottom section 311 is preferably at least partially convex on the outside 319, and on the inside 318 it is preferably at least partially concave. This can also be referred to as dome shaped.

The cover part bottom section 321 is preferably at least partially concave on the inside 328 and more preferably at least partially convex on the outside 329 . This can also be referred to as dome shaped.

The flow resistance of the flow channels 339 is reduced by the convex design of the outside 319 of the combustion chamber part bottom section 311 and the concave design of the inside of the cover part bottom section 321 . There is a gentle deflection in the desired direction. The fluid guide body 30 can also be referred to as a guide grid or radial guide grid. The fluid guide body 30 enables the first fluid flow 101 to be guided in the direction of the combustion chamber 22 with little counter-pressure. The design of the fluid guide body 30 means that the first fluid flow 101 is guided into the combustion chamber with a defined wall geometry. This reduces or prevents the risk of detachment of the first fluid stream and the formation of dead water areas. The geometry of the fluid guide body 30 creates in the combustion chamber 22 in the area in front of the injection valve 23 of 1 a fluid cushion through the first fluid flow, which protects the inflow area and the injection valve 23 during operation from sooting through the combustion or post-combustion taking place in the combustion chamber 22 .

3 shows the fluid guide body 30 in an exploded view, with the cover part 32 being shown tilted. In the exemplary embodiment, the combustion chamber part 31 has six guide vanes 33, between which the flow channels 339 are formed. A different number of guide vanes is also possible, for example 4, 5, 7, 8. At least four guide vanes 33 are preferably provided, more preferably at least six guide vanes 33.

The guide vanes 33 can be formed in one piece with the combustion chamber part 31 . Alternatively, the guide vanes 33 and the combustion chamber part 31 can be made in several pieces and can be joined by a joint connection. In the exemplary embodiment, for example, six guide vanes 33 can be joined to the combustion chamber part 31 as individual parts. For example, a welded connection or a soldered connection is suitable for joining.

Alternatively, the guide vanes 33 can be cut from a thick-walled sheet metal and then positioned lying on the combustion chamber part 31 and connected to it.

The cover part 32 has depressions 326 on the inside 328 in the region of the cover part bottom section 321 , into which depressions 326 the guide vanes 33 extend at least in regions after the fluid guide body 30 has been installed. The indentations 326 on the one hand enable a good positioning of the cover part 32 relative to the combustion chamber part 31. On the other hand solder paste for a soldering process can be introduced into the indentations 326 during assembly and kept in a liquid phase.

The combustion chamber part 31 can then be inserted into the cover part 32 from above in order to enable a soldered connection between the guide vanes 33 and the cover part 32 . This enables a soldering process in which no further solder flow stop is necessary.

In the exemplary embodiment, the depressions 326 are produced by embossing, and corresponding elevations 334 are provided on the outside 329 of the cover part 32 .

The guide vanes 33 preferably extend at least partially up to the combustion chamber part inflow opening 313. This enables a defined first fluid flow 101 up to the combustion chamber part inflow opening 313.

The guide vanes 33 have a first guide vane end 331 , a middle region 333 and a second guide vane end 332 . The first guide vane end 331 is arranged closer to the fluid guide body inflow opening 303 than the second guide vane end 332. In the case of this type of guide vanes 33, those skilled in the art speak of radial guide vanes 33. However, the path of the guide vanes 33 is preferably oblique to the purely radial direction 3031, and in Trying this has led to better mixing of the first fluid stream 101 and the second fluid stream 102 of 1 guided.

The guide vanes 33 are preferably at least partially wider in the middle area 333 than at the first guide vane end 331 in order to bring about a nozzle effect. In the same way, the guide vanes 33 are preferably at least partially wider in the central region 333 than at the second end 332 of the guide vanes, in order to bring about a nozzle effect. With a nozzle effect, there is a conversion between flow velocity and static pressure. A nozzle can act as a confuser or as a diffuser.

4 12 shows an embodiment of the combustion chamber part 31 in which the guide vanes 33 have projections 335 on their side facing away from the combustion chamber part bottom section 311 , which projections extend into associated recesses in the cover part 32 . The projections 335 serve as positioning aids when assembling the fluid guide body 30.

5 shows a further embodiment of the cover part 31, in which recesses 317 are provided in the cover part bottom section 311. The guide vanes 33 have projections 335 which allow the guide vanes 335 to be inserted into the recesses 317 . After the guide vanes 33 have been inserted, they can be firmly connected to the combustion chamber part 31, for example by a welded connection or soldered connection.

In the exemplary embodiment, the guide vanes 33 are designed as sheet metal parts which are positioned standing on the combustion chamber part 31 .

6 shows an example of the inside 318 of the combustion chamber part 31 of FIG 4 . The inside 318 of the combustion chamber part bottom section 311 is designed to define the combustion chamber 22 in the area of the fluid guide body 30, cf. 1 . For this, the material must be suitable for high temperatures.

7 shows an embodiment of the cover part 32, which for example. For connection to the combustion chamber part 31 of 4 is trained. Recesses 327 are provided in the cover part 32 and are in the form of through-recesses. The projections 335 of the vanes 33 of 4 can extend into the recesses 327 and thus define an exact position between the combustion chamber part 31 and the cover part 32.

In the edge section 322 of the cover part, two indentations 325 are provided, for example, which can also be referred to as beads. The depressions 325 enable precise positioning of the fluid guide body 30 in the fluid guide device 20 of FIG 1 .

8th shows a further exemplary embodiment of the cover part 32. An integrated guide bushing 361 is provided on the cover part 32, which has a passage opening 365 for the second air stream 102. The guide bushing 361 has a collar 363 on the outside 329 of the cover part 32. The guide bushing 361 has a sleeve-like depth and is preferably calibrated. The guide bushing 361 allows good positioning of the injector 23 of 1 relative to the fluid guide body 30.

9 shows the inner side 328 of the cover part 32 of FIG 8th . The guide bushing 361 defines a guide surface 362 for the first fluid stream 101.

• - Druckteil,
• - Pressteil,
• - Tiefziehteil,
• - Sinterteil, oder
• - Gussteil.

The combustion chamber part 31 and / or the cover part 32 can be manufactured as

• - pressure part,
• - pressed part,
• - deep-drawn part,
• - Sintered part, or
• - casting.

• - Stahl,
• - Aluminium,
• - Aluminiumlegierung,
• - Nickel,
• - Nickellegierung,
• - Keramik,
• - Kunststoffhaltiger Sinterwerkstoff.

The combustion chamber part 31 and/or the cover part 32 preferably have at least one material from the group of materials consisting of:

• - Stole,
• - aluminum,
• - aluminum alloy,
• - nickel,
• - nickel alloy,
• - ceramics,
• - Sintered material containing plastic.

Since the combustion chamber part 31 is thermally more heavily loaded, the material used for this is nickel or a nickel alloy is particularly well suited. Ceramics are also suitable for high temperatures.

Of course, a wide range of variations and modifications are possible within the scope of the invention.

Claims (18)

Fluid guide device (20) for exhaust gas aftertreatment, which fluid guide device (20) has a fluid guide body (30) with guide vanes (33), which fluid guide body (30) has a combustion chamber part (31) and a cover part (32), which combustion chamber part (31) is designed in the form of a cover with a combustion chamber part bottom section (311) and a combustion chamber part edge section (312), which cover part (32) is in the form of a cover with a cover part bottom section (321) and a cover part edge section (322), which combustion chamber part floor section (311) has a combustion chamber part inflow opening (313) and which cover part floor section (321) has a cover part inflow opening (323), which together form a fluid guide body inflow opening (303), which guide vanes (33) are provided on an outer side (319) of the combustion chamber part bottom section (311), and which cover part (32) is arranged on the outer side (319) of the combustion chamber part (31) in such a way that between the guide vanes (33) flow channels (339) are formed, which enable a first fluid flow (101) inside the fluid guide body (30), which first fluid flow (101) from outside the fluid guide body (30) through the area (305) between the combustion chamber part edge section (312) and the cover part edge section (322), then through the flow channels (339) to the area (306) between the combustion chamber part inflow opening (313) and the cover part inflow opening (323) and from there into the fluid guide body inflow opening (303). runs in order to mix the first fluid stream (101) with a second fluid stream (102 ) to allow. Fluid guide device after claim 1 , in which the combustion chamber part (31) and the guide vanes (33) are formed in several pieces and are joined by a joint connection. Fluid guide device after claim 1 or 2 , in which the combustion chamber part (31) or the cover part (32) or both the combustion chamber part (31) and the cover part (32) have recesses (317; 327) into which the guide vanes (33) extend at least in regions. Fluid guide device according to one of the preceding claims, in which the cover part (32) has depressions (326) on the inside (328) in the region of the cover part base section (321), into which the guide vanes (33) extend at least in regions. Fluid guide device after claim 4 , in which the guide vanes (33) are connected to the cover part (32) at least partially in the region of the depressions (326). Fluid guide device according to one of the preceding claims, in which the combustion chamber part (31) and the guide vanes (33) are constructed in one piece. Fluid guide device according to one of the preceding claims, in which the guide vanes (33) extend at least partially up to the combustion chamber part inflow opening (313). Fluid guiding device according to one of the preceding claims, in which the guide vanes (33) have a first guide vane end (331), a middle region (333) and a second guide vane end (332), the first guide vane end (331) being closer to the fluid guide body inflow opening ( 303) is arranged as the second vane end (332). Fluid guide device after claim 8 , in which the guide vanes (33) are at least partially wider in the middle area (333) than at the first guide vane end (331) in order to bring about a nozzle effect. Fluid guide device after claim 8 or 9 , in which the guide vanes (33) are at least partially wider in the middle region (333) than at the second guide vane end (332) in order to bring about a nozzle effect. Fluid guiding device according to one of Claims 8 until 10 , in which the guide vanes (33) at the first guide vane end (331) run obliquely to the radial direction (3031) relative to the fluid guide body inflow opening (303). Fluid guide device according to one of the preceding claims, which has an annular inflow opening guide part (35), which inflow opening guide part (35) has a through-opening (351) for a second air flow (102) which extends into the area of the cover part through-opening (323) extends and there forms a guide surface (352) for the first fluid flow (101). Fluid guide device according to one of the preceding claims, wherein the combustion chamber Merteil bottom section (311) on the outside (319) is at least partially convex. Fluid guide device according to one of the preceding claims, in which the cover part bottom section (321) is concave at least in regions on the inside (328). Fluid guide device according to one of the preceding claims, in which the combustion chamber part (31) and the cover part (32) are each manufactured as - pressure part, - pressed part, - deep-drawn part, - Sintered part, or - casting. Fluid guide device according to one of the preceding claims, in which the combustion chamber part (31) or the cover part (32) have at least one material from the group of materials consisting of: - Stole, - aluminum, - aluminum alloy, - nickel, - nickel alloy, - ceramics, and - Sintered material containing plastic. A fluid guide device according to any one of the preceding claims, wherein the inner surface (318) of the combustor portion (31) defines a portion of a combustor (22). Fluid guide device according to one of the preceding claims, which has an injection valve (23) which is positioned relative to the fluid guide body (30) in such a way that there is a second fluid flow (102) from the outside (309) of the fluid guide body (30) through the fluid guide body inflow opening (303) to the inside (308) of the fluid guide body (30) allows.

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