Burner for an exhaust system, in particular of an internal combustion engine for a motor vehicle, and an internal combustion engine, in particular for a motor vehicle - Patents.com

Abstract

The present invention relates to a burner (18) for an exhaust system (10) of an internal combustion engine, comprising a combustion chamber (22) formed by a chamber element (20) of the burner (18) and capable of igniting and burning a mixture comprising air as a first fluid and fuel as a second fluid, thereby heating components of the exhaust system (10), in particular exhaust gas aftertreatment elements, and / or exhaust gases of the internal combustion engine flowing through the exhaust system (10); a passage (42) communicating with a combustion chamber (22) through which at least one fluid can be introduced into the combustion chamber (22); and a closure element (52) movable relative to the chamber element (20) between a closed position (S) that fluidly separates the passage (42) from the combustion chamber (22) and at least one open position (F) that fluidly connects the passage (42) to the combustion chamber (22), the chamber element (20) having a recess (54) in which the closure element (52) is at least partially housed in the open position (F).

Description

[Technical Field]

[0001] The present invention relates to a burner for an exhaust system of an internal combustion engine according to the preamble of claim 1. Furthermore, the invention relates to an internal combustion engine equipped with at least one such burner. [Background technology]

[0002] Patent document 1 discloses a burner for an exhaust pipe line that can be traversed by exhaust gases of an internal combustion engine of a motor vehicle, which has a combustion chamber for igniting and burning a mixture containing air and liquid fuel. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] German Patent Application Publication No. 102021001580 Summary of the Invention [Problem to be solved by the invention]

[0004] The object of the invention is to provide a burner for the exhaust system of an internal combustion engine, and an internal combustion engine equipped with such a burner, whereby a particularly advantageous operation of the burner can be achieved. [Means for solving the problem]

[0005] This problem is solved by a burner having the features of claim 1 and by an internal combustion engine having the features of claim 10. Advantageous embodiments, including expedient developments of the invention, are set forth in the further claims.

[0006] A first aspect of the present invention relates to a burner for an exhaust system of an internal combustion engine, also referred to as an engine or combustion engine, particularly of a motor vehicle, such as a reciprocating piston engine, and therefore also referred to as an exhaust pipe of an internal combustion engine designed as a reciprocating piston engine. This means that a motor vehicle, also referred to simply as a vehicle, preferably designed as a motor vehicle, particularly a passenger car or commercial vehicle, has an internal combustion engine in its fully manufactured state and can be driven by it. In particular, the internal combustion engine is configured, for example, as a diesel engine. During the combustion operation of the internal combustion engine, a combustion process takes place in the internal combustion engine, particularly in at least one or more combustion chambers of the internal combustion engine, resulting in exhaust gases of the internal combustion engine. The exhaust gases resulting from the combustion process of the internal combustion engine are also referred to as engine exhaust gases. In the above and below, when exhaust gases are referred to, this should be understood as engine exhaust gases unless otherwise specified. The exhaust gases can flow from each combustion chamber into an exhaust system and subsequently through the exhaust system. At least one component, such as an exhaust gas aftertreatment element for aftertreatment of the exhaust gases, can be arranged in the exhaust system. The exhaust gas aftertreatment element may be, for example, a catalyst, in particular an SCR catalyst, which may catalytically promote and / or enable selective catalytic reduction (SCR), such that, for example, the SCR catalyst for SCR is catalytically active. In selective catalytic reduction (SCR), nitrogen oxides (NOx) that may be contained in the exhaust gas are at least partially removed from the exhaust gas by reacting the nitrogen oxides with ammonia to form nitrogen and water during selective catalytic reduction. The ammonia is provided, for example, by a liquid reducing agent. The liquid reducing agent is, in particular, an aqueous urea solution. Furthermore, the exhaust gas aftertreatment element may be, for example, a particulate filter, in particular a diesel particulate filter, which may be used to filter particles, in particular soot particles, that may be contained in the exhaust gas from the exhaust gas.

[0007] The burner comprises a chamber element, preferably designed as a solid body, and a combustion chamber formed and particularly defined by the chamber element. In particular, the combustion chamber is particularly directly defined, for example, by the outer circumferential surface of the chamber element. In the combustion chamber, a mixture, also referred to as a burner mixture, which includes air, also referred to as burner air, and preferably liquid fuel, can be ignited and burned. The combustion of the burner mixture, which occurs in the combustion chamber, generates burner exhaust gases, also referred to as burner exhaust gases, in the combustion chamber. The burner exhaust gases can, for example, flow out of the combustion chamber and into an exhaust system, i.e., into an exhaust passage through which the engine exhaust gases of the exhaust system can flow, in particular at an inlet point located upstream of the aforementioned component in the flow direction of the engine exhaust gases flowing through the exhaust passage. For example, the burner exhaust gases can be mixed with the engine exhaust gases, in particular in the exhaust passage. As a result, the burner exhaust gases, in particular the burner exhaust gases mixed with the engine exhaust gases, can, for example, flow through a component, thereby heating the component, i.e., heating and / or keeping it warm. The air forming the burner mixture with the preferably liquid fuel is also called burner air. The internal combustion engine operates in combustion mode, for example, using a power fuel, in particular a liquid one. In particular, if the internal combustion engine is designed as a diesel engine, the power fuel can be a diesel power fuel. In this case, it has been found to be particularly advantageous if a power fuel is used as the fuel.

[0008] The burner air is, or may be referred to as, the first fluid. The fuel is, or may be referred to as, the second fluid. The burner mixture can be ignited and combusted to heat exhaust system components, particularly exhaust gas aftertreatment elements, and / or engine exhaust gases flowing through the exhaust system. The components are indirectly heated or insulated via the heated engine exhaust gases.

[0009] For example, the burner has an ignition element, particularly an electrically operable ignition element, which, for example, penetrates a through-opening in the chamber element and projects therethrough, for example, into the combustion chamber. Therefore, it is particularly conceivable that the ignition element is at least partially arranged in the combustion chamber, particularly such that one end, particularly a free end, of the ignition element is arranged in the combustion chamber and thus projects into the combustion chamber. The ignition element can be used to ignite the burner mixture, particularly in the combustion chamber. For example, at least one ignition spark for igniting the burner mixture can be provided, i.e., generated, by the ignition element, particularly in the combustion chamber and / or using electrical energy, so that the burner mixture in the combustion chamber can be ignited, particularly by the ignition spark. The ignition element can be designed, for example, as a glow plug or a spark plug.

[0010] The burner further has a passage through which at least one of the fluids can flow, which, when viewed alone, leads to the combustion chamber. For this purpose, the passage has, for example, at least one, or exactly one, outlet opening, through which the passage, when viewed alone, leads to the combustion chamber. Thus, particularly during operation of the burner, at least one fluid can flow through the passage, in particular through the outlet opening of the passage, and thereby exit the passage via the outlet opening and enter, in particular directly, the combustion chamber. The line element and, therefore, the outlet opening for the fluids can be pierced by exactly one of the fluids, so that, after the fluid has exited the passage, for example, one fluid is supplied with or mixed with another fluid. It is also conceivable that the passage and, therefore, the outlet opening can be pierced by two fluids. Thus, for example, two fluids can be introduced into the combustion chamber via the passage. The passage is also called a line element, or the passage is, for example, defined, in particular directly, by a line element, which is designed as a solid body. In this case, it is particularly conceivable that the passage is bounded, in particular directly bounded, by the inner circumferential outer surface of the line element.

[0011] The burner further includes a closure element, preferably designed as a solid body, movable relative to the chamber element between a closed position that fluidically separates the passage from the combustion chamber and at least one open position that fluidly connects the passage to the combustion chamber. This means that in the closed position, the passage is fluidically separated from the combustion chamber by the closure element, thereby allowing no or only a small amount of fluid to flow out of the closed position, i.e., in particular, no fluid can flow out of the line element and into the combustion chamber. The closed position is particularly advantageous in that, in the closed position, gases, such as engine exhaust gases from the combustion chamber, cannot enter the passage. At the very least, the closed position prevents particles that may be contained in the engine exhaust gases from entering the passage. For example, the combustion chamber is fluidly connected to the exhaust passage. For example, if the burner is deactivated and therefore does not provide burner exhaust gas, at least a portion of the engine exhaust gases flowing through the exhaust passage may flow into the combustion chamber and thus penetrate or enter the combustion chamber. In this case, since the closing element is in the closed position, particularly when the burner is deactivated, thereby fluidically separating the passage from the combustion chamber, engine exhaust gases from the combustion chamber flowing into the combustion chamber cannot enter the passage, and therefore the engine exhaust gases or particles that may be contained therein cannot enter, for example, undesired areas of the burner, from the exhaust passage. The burner, for example, has an introduction element by means of which, in particular, liquid fuel can be introduced, in particular injected, into the combustion air at an introduction point that can be arranged upstream of the combustion chamber, in particular in the flow direction of the combustion air flowing through the combustion chamber, and in particular upstream of the outlet opening. Furthermore, the burner has an air passage that can be pierced by the burner air, for example, extending upstream of the outlet opening. In this case, since the closing element is in the closed position, particularly when or while the burner is deactivated, thereby fluidically separating the passage from the combustion chamber, engine exhaust gases from the combustion chamber, for example, cannot enter the air passage and / or the introduction element, thereby protecting the air passage and / or the introduction element from the engine exhaust gases, in particular when or while the burner is deactivated.

[0012] In this case, to achieve a particularly advantageous operation of the burner, the invention provides that the chamber element has a recess, also called a pocket, on its inner side, particularly facing the combustion chamber, and that in the open position the closure element is at least partially, particularly at least largely, and therefore at least half or more, accommodated in this recess. This ensures a particularly flow-favorable contour, particularly an inner contour, of the combustion chamber in the open position of the closure element, thereby achieving a particularly efficient operation of the burner. In particular, the invention makes it possible to avoid excessive obstruction by the closure element of the flows occurring in the combustion chamber, particularly the flows of burner air and / or burner mixture, thereby realizing a particularly efficient operation of the burner. Furthermore, in the open position, the closure element can be protected, for example, from oncoming or surrounding flows of burner exhaust gases.

[0013] It is therefore envisaged that in the released position at least one partial region, also referred to as positioning region, of the closure element, in particular at least the majority of the partial region, also referred to as positioning region, and therefore at least half or more, is arranged in the recess, and that in the closed position, for example, the positioning region is arranged outside the recess, in particular within the combustion chamber. Furthermore, with regard to the entire region, also referred to as storage region, of the closure element, which is arranged in the recess in the released position, it is envisaged that in the closed position at least a part, in particular at least the majority of the storage region, and therefore at least half or more, is arranged outside the storage region, in particular within the combustion chamber. The storage region can be the entire closure element.

[0014] The present invention is based, inter alia, on the following recognition and consideration: Internal combustion engines, particularly for automobiles, are typically equipped with exhaust gas aftertreatment devices. Exhaust gas aftertreatment can be performed by the respective exhaust gas aftertreatment devices, by which or during which the respective exhaust gas of the respective internal combustion engine is aftertreated. The purpose of the exhaust gas aftertreatment can, inter alia, be to reduce or remove harmful substances, such as nitrogen oxides, that may be present in the exhaust gas. A minimum operating temperature of the exhaust gas aftertreatment device, and thus the aforementioned exhaust gas aftertreatment elements, is typically required to enable the advantageous functioning of the exhaust gas aftertreatment device. For example, during a cold start of the internal combustion engine, the internal combustion engine may have operating regions in which the engine exhaust gas alone is insufficient to heat the exhaust gas aftertreatment device to at least its operating temperature, or the exhaust gas aftertreatment device cannot heat to its operating temperature quickly enough. The exhaust gas aftertreatment system can be further heated by using a burner. In operating regions in which the burner is not needed and is therefore deactivated, it is preferable to ensure that the burner components are protected, for example, from fouling. In particular, the passageway is fluidly separated or isolated from the combustion chamber by the closure element in the closed position as described above, thereby protecting burner components. Before starting operation, i.e., before activating a burner that has been initially deactivated, the closure element is moved, particularly pivoted, from the closed position to the open position relative to the chamber element, particularly moving the closure element away from the passageway, particularly away from the outlet opening. For example, if an excessive portion of the closure element is located in the combustion chamber in the open position and is exposed in the combustion chamber in the open position, the closure element may be strongly heated, particularly to a temperature corresponding to the temperature of the combustion gases surrounding the closure element. In particular, the combustion gases are burner exhaust gases. As a result, it may be necessary to manufacture the closure element from costly heat-resistant steel, possibly with a high nickel content. Furthermore, if an excessive portion of the closure element is exposed in the combustion chamber in the open position, the gas flow of, for example, the air-fuel mixture and / or burner exhaust gases may be obstructed.This applies both to the radial flow caused by the expansion of combustion gases from the center of the combustion chamber, also called combustion chamber, towards components arranged downstream, and to the free inflow of burner air, also called combustion air, from passages, also called supply lines, into the combustion chamber, which can result in excessive amounts of soot being generated during burner operation, which can lead to undesirable emissions if appropriate measures are not taken.

[0015] Here, in the release position, the closure element is at least partially, in particular at least largely or completely housed in the recess, so that the aforementioned disadvantages can be avoided.

[0016] For example, the combustion chamber may be designed at least substantially rotationally symmetric, particularly on the inner periphery, and the chamber element, and thus the combustion chamber, may have, for example, an at least substantially rotationally symmetric recess. In particular, it is conceivable that the recess be integrally formed in the chamber element and the combustion chamber as an at least rotationally symmetric pocket. When the closure element is moved relative to the chamber element from the closed position to the open position, the closure element at least partially penetrates into the recess. Preferably, in the open position, the closure element is located to a large extent, or even completely, within the recess, so that the rotationally symmetric interior space of the combustion chamber is at least almost completely empty of the closure element, and the said interior space is designed or available as a combustion volume. Particularly preferably, the closure element penetrates into the recess so that its side facing away from the combustion chamber is located in close proximity to the outer wall of the recess. In particular, the present invention provides at least the following advantages: Since the closure element is not excessively exposed in the combustion chamber in the open position, it absorbs only a small amount of combustion heat. For example, the closure element can release at least a portion of the absorbed combustion heat back into the surrounding environment via the said outer wall. This makes it possible to avoid excessive temperatures of the closing element, which can be manufactured, for example, at low cost. The closing element recesses into the recess and is therefore accommodated in the recess in the open position, so that an at least approximately rotationally symmetrical area without obstructing contours can be created in the open position, where there is no closing element and this area is at least part of the combustion chamber. In this at least approximately rotationally symmetrical area, a swirl flow, in particular of the burner mixture and / or burner air, which is necessary for a particularly advantageous, soot-free and efficient combustion, can then be generated. A particularly efficient operation of the burner can therefore be achieved.

[0017] In order to be able to achieve a particularly efficient and therefore particularly advantageous operation of the burner, one embodiment of the present invention provides that at least one first partial region of the outer circumferential jacket surface of the closure element, which in the open position faces the combustion chamber, in particular the interior space or region, and at least one second partial region of the inner circumferential jacket surface of the chamber element, which is located opposite the first partial region in the open position and faces the combustion chamber and the first partial region in the open position, form a rotationally symmetrical region of the combustion chamber, also referred to as the combustion chamber region. The combustion chamber region is free, in particular completely free, of closure elements, so that a particularly advantageous flow, in particular a vortex flow, in particular of the burner mixture and / or burner air, can be generated in the combustion chamber region.

[0018] Another embodiment is characterized in that, in the open position, at least one first portion of the outer circumferential surface of the closure element, which faces the combustion chamber in the open position, and at least one second portion of the inner circumferential surface of the chamber element, which is located opposite the first portion in the open position and faces the combustion chamber and the first portion in the open position, form a region of the combustion chamber, also referred to as the chamber region, that is mirror-symmetrical with respect to at least one plane of symmetry. For example, the first portion of the outer circumferential surface can be the first partial region of the outer circumferential surface. Furthermore, it is conceivable that the second portion of the inner circumferential surface is the second partial region of the inner circumferential surface. Furthermore, it is conceivable that the chamber region is the aforementioned combustion chamber region. In this case, it is further conceivable that a straight line extends in the plane of symmetry and passes through an outlet opening of a passage leading to the combustion chamber via the outlet opening, in particular so that the straight line passes through the center of the outlet opening. For example, the outlet opening is circular and is therefore designed in the shape of a circle, the center point of which for example coincides with the center of the aforementioned outlet opening and lies on the aforementioned straight line, so that a particularly advantageous flow, in particular a vortex flow, in particular of the burner mixture and / or burner air occurs in the chamber area, which makes it possible to achieve a particularly efficient operation of the burner.

[0019] In another particularly advantageous embodiment of the invention, it is provided that the closing element is arranged at least to a large extent, i.e. at least halfway or even completely, in the recess in the open position, which makes it possible to avoid excessive heating of the closing element and to create particularly favorable flow conditions in the combustion chamber, thus ensuring particularly efficient operation of the burner.

[0020] Another embodiment is characterized in that the closure element is pivotable about a pivot axis relative to the chamber element between an open position and a closed position. In that case, the closure element has, for example, a lever that is pivotable about a pivot axis relative to the chamber element between an open position, also called an open position, and a closed position, and a closure member, also called a cap or flap, closure flap or closure cap. The closure member is formed separately from the lever and is held on the lever, so that the closure member, together with the lever, is pivotable about the pivot axis relative to the chamber element between the open position and the closed position.

[0021] In the closed position, the closure element covers the outlet opening of the passage, thereby fluidically isolating or at least covering the passage from the combustion chamber. In the released position, the closure element releases the outlet opening, thereby fluidly connecting the passage to the combustion chamber via the outlet opening. In particular, the closure element is not arranged to overlap the outlet opening in the released position. This allows for a particularly reliable and therefore robust movement of the closure element between the released and closed positions, thereby allowing for a particularly advantageous operation of the burner.

[0022] It has proven particularly advantageous in this case if the pivot axis extends through the recess, as this allows the closing element to be accommodated to a very large extent, i.e. to a very large extent or even completely, in the recess, thereby ensuring a particularly advantageous operation of the burner.

[0023] Another embodiment is characterized in that the closing element is held on the lever with play, so that it can move only to a limited extent relative to the lever. In other words, the lever and the closing element are multi-part, i.e. made separately, and designed with a certain play between them, i.e. held adjacent to each other. This allows the closing element, for example when the closing element is moved into the closed position, to abut flush and / or tightly against or on the line element, in particular against or on the end face of the line element facing the combustion chamber, thereby closing and therefore sealing or at least covering the outlet opening, which is formed for example as a hole.

[0024] The lever and the closure element held therein form a lever mechanism that, in the open position, is accommodated in a flow-favorable manner in a recess, also called a cavity. In particular, in the open position, the lever mechanism can be accommodated in the recess without undercuts, sharp edges, or abrupt transitions. The closure element, in particular the lever mechanism, is designed to ensure good heat transfer between the closure element and the chamber element, also called a housing. For this purpose, for example, a large-volume design of the closure element is provided to ensure favorable heat transfer. Preferably, the recess in the chamber element, also called a pocket, is designed so that only a small gap exists between the closure element and the contour, particularly the inner contour, of the recess. For example, the recess has the same contour, particularly the inner contour, as the contour, particularly the outer contour, of the closure element, in which case, for example, the inner contour of the recess is enlarged compared to the outer contour of the closure element by an allowance for thermal expansion of the closure element. Alternatively or additionally, for example, the closure element, in particular the lever, can have the same or at least a similar radius on the combustion chamber side in the open position as the combustion chamber, thereby realizing a flow-favorable arrangement.

[0025] Another particularly advantageous embodiment of the invention provides for the inner contour of the recess facing the closure element in the release position to be adapted to the outer contour of the closure element facing the inner contour in the release position, which allows the closure element to be accommodated particularly extensively or even completely within the recess, thereby ensuring a flow-favorable shape of the combustion chamber, in particular of the inner contour.

[0026] Finally, it has proven particularly advantageous if at least one wall region of the chamber element adjacent to the recess is flush with the closure element in the open position, which allows favorable flow conditions to be achieved in the combustion chamber and thus allows for efficient operation of the burner.

[0027] A second aspect of the invention relates to an internal combustion engine equipped with at least one burner according to the first aspect of the invention. Advantageous and advantageous embodiments of the burner according to the invention can be considered as advantageous and advantageous embodiments of the internal combustion engine according to the invention and vice versa.

[0028] Further advantages, features and details of the present invention will become apparent from the following description of preferred embodiments and from the drawings. The features and combinations of features mentioned in the above description and in the following description of the figures and / or shown only in the figures can be used not only in the respective combinations presented, but also in other combinations or alone without departing from the scope of the present invention. [Brief explanation of the drawings]

[0029] [Figure 1] 1 is a schematic partial cross-sectional view of a motor vehicle internal combustion engine with a burner, the closing element of the burner being in the release position; [Figure 2] 2 is a schematic cross-sectional view of the internal combustion engine taken along the cutting line AA shown in FIG. 1. [Figure 3] 3 is another schematic partial cross-sectional view of an internal combustion engine, with the closure element in the closed position; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0030] In the various figures, identical or functionally identical elements are designated by the same reference numerals.

[0031] FIG. 1 partially illustrates an internal combustion engine of a motor vehicle in a schematic cross-sectional view. In particular, FIG. 1 partially illustrates an exhaust system 10 of the internal combustion engine, also referred to as an exhaust pipe. The exhaust system has an exhaust line element 12, which has, in particular defines, and very particularly directly defines, an exhaust passage 14. The internal combustion engine can operate in a combustion mode. In combustion mode, the internal combustion engine produces exhaust gases, also referred to as engine exhaust gases, which can flow through the exhaust passage 14. In FIG. 1, the engine exhaust gases flowing through the exhaust passage 14 are indicated by arrows 16. The internal combustion engine has a burner 18 arranged in the exhaust system 10, which can be used to heat the engine exhaust gases and / or components of the exhaust system 10. For this purpose, the burner 18 comprises a chamber element 20, which is particularly designed as a solid body, and a combustion chamber 22 formed and particularly defined by the chamber element 20. In particular, the combustion chamber 22 is particularly directly defined by an inner circumferential outer surface 24 of the chamber element 20. In the combustion chamber 22, a mixture, also referred to as a burner mixture, can be ignited and thereby burned. The burner mixture includes air, also referred to as burner air. The burner air is further referred to as a first fluid. The burner mixture further includes a fuel, particularly a liquid fuel, also referred to as a second fluid. Ignition and combustion of the burner mixture generates exhaust gases from the burner 18, also referred to as burner exhaust gases, which are indicated in FIG. 1 by arrows 26. It can be seen that the chamber element 20 has a through-flow opening 28, through which the combustion chamber 22 is fluidly connected to the exhaust passage 14. The burner exhaust gases can flow through the through-flow opening 28, thereby leaving the combustion chamber 22 at the inlet point E and entering the exhaust passage 14, whereby the burner exhaust gases are introduced into the engine exhaust gases. This heats the engine exhaust gases or forms a total exhaust gas, including the engine exhaust gases and the burner exhaust gases, which can flow from the inlet point E through the exhaust system 10, particularly the exhaust passage 14. This is indicated by arrow 30.For example, in the exhaust system 10, at least one exhaust gas aftertreatment element is arranged downstream of the inlet point E, which exhaust gas aftertreatment element can aftertreatment the engine exhaust gas and also the burner exhaust gas. By heating the engine exhaust gas as described above or by the hot total exhaust gas or the burner exhaust gas, the exhaust gas aftertreatment element can be warmed and / or kept warm, so that, for example, the exhaust gas aftertreatment element can reach its operating temperature or start-up temperature, also called light-off temperature, particularly quickly.

[0032] An air supply 32 is provided that can supply burner air to the burner 18, particularly the combustion chamber 22. For this purpose, the air supply 32 has an air passage 34 through which the burner air can flow. Arrows 36 indicate the flow of the burner air through the air passage 34. The air passage 34 is formed, for example, as a component 38 of the burner 18, particularly a solid component. The air supply 32 can have an air line (not shown in the figure) through which the burner air can flow. For example, the air line can be formed separately from the component 38 and mechanically connected to it, with the air line fluidly connected to the air passage 34. As a result, the burner air flowing through the air line can exit the air line and enter the air passage 34, thereby flowing through the air passage 34, thereby, for example, supplying or introducing the burner air to the combustion chamber 22, particularly via the air passage 34. In particular, it is conceivable to mechanically connect the air line to the component 38 by means of a V-shaped belt clamp, which allows for a particularly simple and therefore fast and cost-effective assembly to be realized.

[0033] The burner 18 further comprises an introduction element 40 by means of which fuel can be introduced, in particular injected, into the burner air, in particular at an introduction point. In particular, the introduction point is located upstream of the combustion chamber 22 in the flow direction of the burner air flowing through the burner 18, and therefore outside the combustion chamber 22. The burner air is also referred to as the first fluid. The fuel is also referred to as the second fluid.

[0034] Burner 18, and in particular component 38, comprises passages 42 through which at least one of the fluids can flow, for example. In the exemplary embodiment shown in the figures, passages 42 allow two fluids to flow therethrough, namely both fuel and burner air, and in particular allow a burner mixture including the fluid to flow therethrough.

[0035] Here, burner air can be introduced from the air passage 34 into the passage 42, so that the passage 42 can be supplied with burner air flowing through the air passage 34 by the air passage 34. This particularly means that the air passage 34 is arranged or extends upstream of the passage 42 in the flow direction of the burner air flowing through the air passage 34 and the passage 42. Furthermore, fuel can be introduced, particularly directly, into the passage 42 by the introduction element 40, particularly by injection, so that the passage 42 can be supplied with fuel by the introduction element 40. Thus, an introduction point is arranged, for example, in the passage 42, which is arranged upstream of the combustion chamber 22. From FIG. 1 it can further be seen that the air passage 34 is arranged or extends upstream of the combustion chamber 22. The burner air and fuel flow through the passage 42, particularly in a mixed state, and can enter and thus be introduced into the combustion chamber 22 via the passage 42. For this purpose, the passage 42 has an outlet opening 44, through which the passage 42 leads to the combustion chamber 22.

[0036] For example, the outlet opening 44 is designed rotationally symmetrical relative to a straight line 46. In this case, for example, the outlet opening 44 is circular and thus designed in the shape of a circle, the center point of which lies on the straight line 46. The center point is also called the center of the outlet opening 44 or is the center of the outlet opening 44. An arrow 48 indicates that the introduction element 40 is supplied with fuel.

[0037] 1, arrows 50 indicate that burner 18, and in particular a vortex generator (not shown in detail) of burner 18, is used to create a vortex flow of the burner air and thus the burner mixture in combustion chamber 22. This means that the burner air and therefore the burner mixture flows in a vortex pattern at least within combustion chamber 22. This allows for advantageous mixing of the burner air and the fuel.

[0038] The burner 18 also comprises a closure element 52, which in the exemplary embodiment shown in the figures is designed as a lever mechanism. The closure element 52 is movable relative to the chamber element 20 between at least one release position F, shown in Figure 1, and a closed position S, shown in Figure 3. In the exemplary embodiment shown in the figures, the closure element 52 is pivotable relative to the chamber element 20 about a pivot axis SA between the closed position S and the release position F. In the closed position S, the passage 42 is fluidly separated from the combustion chamber 22 by the closure element 52 (Figure 3). In the release position F, the closure element 52 releases the outflow opening 44, and therefore the passage 42, so that in the release position F the passage 42 is fluidly connected to the combustion chamber 22 via the outflow opening 44 (Figure 1).

[0039] To achieve a particularly advantageous operation of the burner 18, the chamber element 20, in particular the inner circumferential jacket surface 24 thereof, has a recess 54, also called a pocket, in which the closure element 52 is at least partially, in particular mostly, and therefore at least halfway or completely accommodated in the open position F. This can be particularly clearly seen in FIG. 2, in which the burner 18 is shown in a schematic cross-section along the section line AA shown in FIG. 1. The at least partial accommodation of the closure element 52 in the pocket in the open position F allows for a particularly flow-favorable region B of the combustion chamber 22, also called the interior space, to be achieved, in which a vortex flow can be particularly advantageously generated. In particular, region B is an at least substantially rotationally symmetric region of the combustion chamber 22. Alternatively or additionally, for example, region B may be an at least substantially mirror-symmetric region of combustion chamber 22, which is mirror-symmetric, i.e., axially symmetric, with respect to a plane of symmetry, in which line 46 extends. In FIG. 2 , this plane of symmetry is designated EB1, and a second plane of symmetry EB2, in which line 46 extends, is also designated. For example, region B may also be mirror-symmetric, i.e., axially symmetric, with respect to plane of symmetry EB2. For example, it can be seen from FIG. 1 that region B is formed, in the open position F, by, for example, a first partial region TB1 of closure element 52 and a second partial region TB2 of inner circumferential outer surface 24. First partial region TB1 is a first partial region of outer circumferential outer surface 56 of closure element 52, and second partial region TB2 is a second partial region of inner circumferential outer surface 24 of chamber element 20. In the open position F, a first partial region TB1 of the outer circumferential surface 56 of the closure element 52 faces the combustion chamber 22, in particular such that in the open position F a portion of the combustion chamber 22 is directly defined by the partial region TB1. In the open position F, the partial region TB2 is located opposite the partial region TB1, and in the open position F a second partial region TB2 of the combustion chamber 22 faces the first partial region TB1. In particular, for example, in the open position F the second portion of the combustion chamber 22 is directly defined by the partial region TB2. For example, the first partial region TB1 is a first portion of the outer circumferential surface 56, and the partial region TB2 is a second portion of the outer circumferential surface 24.

[0040] In the exemplary embodiment shown in the figures, the closure element 52 has a lever 58 that is pivotable about a pivot axis SA relative to the chamber element 20 between a closed position S and an open position F, and a closure member 60, also referred to as a flap or closure flap. The closure member 60 is formed separately from the lever 58 and is held by the lever 58, such that the closure member 60 and the lever 58 are pivotable together about the pivot axis SA relative to the chamber element 20 between the open position F and the closed position S. In the closed position S, the outflow opening 44 is covered by the closure member 60, thereby fluidly isolating the passage 42 from the combustion chamber 22. In the open position F, the closure member 60 releases the outflow opening 44 such that the closure member 60 is positioned without overlapping the outflow opening 44 in the open position F. As a result, the passage 42 is fluidly connected to the combustion chamber 22 via the outflow opening 44. For example, the closure member 60 is held by the lever 58 so as to be movable within a limited range. In the closed position S (FIG. 3), the closure element 60 can thereby advantageously abut against the line element 62, in particular against the end face 64 of the line element 62 facing the combustion chamber 22, thereby advantageously sealing off the outlet opening 44 and thus fluidically blocking it. The line element 62 is solid, and the passage 42 is defined, in particular directly defined, by the line element 62, in particular by an inner circumferential outer surface 66 of the line element 62. For example, the line element 62 is the component 38 or is formed integrally with the component 38. In other words, for example, the component 38 and the line element 62 are formed from a single part. It is also conceivable that the component 38 and the line element 62 are formed separately from each other and connected to each other.

[0041] It can further be seen from Figures 1 and 3 that in the release position F the wall regions W of the chamber element 20 adjacent on both sides of the recess 54 are flush with the closure element 52, in particular with its outer peripheral outer surface 56, and very particularly with the partial region TB1, so that the region B can be designed in a particularly flow-favorable manner.

[0042] Furthermore, it is contemplated that the inner contour of the recess 54 facing the closure element 52 in the release position F is adapted to the outer contour of the closure element 52 facing the inner contour in the release position F, so that the inner and outer contours have the same shape. In other words, the outer contour has a positive shape, and the inner contour has a negative shape that matches or corresponds to the positive shape. In this case, for example, the outer contour facing the inner contour faces away from the partial region TB1. It can also be seen from FIGS. 1 to 3 that at least one partial region of the closure element 52, also referred to as the placement region or storage region, is arranged in the recess 54 in the release position F. In contrast to the entire placement region of the closure element 52 arranged in the recess 54 in the release position F, at least a portion, here a majority, i.e., more than half, of the placement region arranged in the recess 54 in the release position F, is arranged outside the recess 54, in this case, specifically within the combustion chamber 22. [Explanation of symbols]

[0043] 10. Exhaust system 12 Exhaust line elements 14 Exhaust passage 16 Arrow 18 Burner 20 chamber elements 22 combustion chamber 24 Inner outer surface 26 Arrow 28 Through-flow opening 30 Arrow 32 Air supply section 34 Air passage 36 Arrow 38 Components 40 Introductory Elements 42 Passage 44 Outlet opening 46 straight line 48 Arrow 50 Arrows 52 Closure elements 54 Recess 56 Outer surface of outer periphery 58 Lever 60 Closure member 62 Line Elements 64 End face 66 Inner outer surface E. Introduction point B area TB1 First subregion TB2 Second subregion EB1 symmetry plane EB2 symmetry plane F release position S closed position

Claims

1. 1. A burner (18) for an exhaust system (10) of an internal combustion engine, comprising: a combustion chamber (22) formed by a chamber element (20) of the burner (18) and capable of igniting and burning a mixture comprising air as a first fluid and fuel as a second fluid, thereby heating components of the exhaust system (10), in particular exhaust gas aftertreatment elements, and / or exhaust gases of the internal combustion engine flowing through the exhaust system (10); a passage (42) through which at least one of the fluids can flow and which communicates with the combustion chamber (22), capable of introducing the at least one fluid into the combustion chamber (22); and a closure element (52) movable relative to the chamber element (20) between a closed position (S) fluidically separating the passage (42) from the combustion chamber (22) and at least one open position (F) fluidically connecting the passage (42) to the combustion chamber (22), The chamber element (20) has a recess (54) in which the closure element (52) is at least partially received in the release position (F). A burner characterized by:

2. In the release position (F), at least one first partial region (TB1) of the outer circumferential surface (56) of the closure element (52), which faces the combustion chamber (22) in the release position (F), and at least one second partial region (TB2) of the inner circumferential surface (24) of the chamber element (20), which is located opposite the first partial region (TB1) in the release position (F) and faces the combustion chamber (22) and the first partial region (TB1) in the release position (F), form a rotationally symmetrical region (B) of the combustion chamber (22). characterized in that The burner (18) of claim 1.

3. In the release position (F), at least one first portion (TB1) of the outer circumferential outer surface (56) of the closure element (52), which faces the combustion chamber (22) in the release position (F), and at least one second portion (TB2) of the inner circumferential outer surface (24) of the chamber element (20), which is located on the opposite side of the first portion (TB1) in the release position (F) and faces the combustion chamber (22) and the first portion (TB1) in the release position (F), form a region (B) of the combustion chamber (22) that is mirror-symmetrical with respect to at least one plane of symmetry (EB1), and a straight line (46) extends in the plane of symmetry (EB1), the straight line passing through the outlet opening (44) of the passage (42) which leads to the combustion chamber (22) via the outlet opening (44), in particular through the center of the outlet opening (44). characterized in that A burner (18) according to claim 1 or 2.

4. The closure element (52) is at least mostly or completely disposed within the recess (54) in the release position (F). characterized in that A burner (18) according to any one of claims 1 to 3.

5. The closure element (52) has a lever (58) that is pivotable about a pivot axis (SA) relative to the chamber element (20) between the release position (F) and the closed position (S), and a closure member (60) that is formed separately from the lever (58) and is held by the lever (58) so as to be pivotable together with the lever (58) about the pivot axis (SA) relative to the chamber element (20) between the release position (F) and the closed position (S), the closure member covering, in the closed position (S), the outlet opening (44) of the passage (42) that leads to the combustion chamber (22) via the outlet opening (44), thereby fluidly blocking it, and opening the outlet opening (44) in the release position (F). characterized in that A burner (18) according to any one of claims 1 to 4.

6. The pivot axis (SA) extends through the recess (54). characterized in that A burner (18) according to claim 5.

7. The closure member (60) has play and is thereby held by the lever (58) so that it can move relative to the lever (58) within a limited range. characterized in that A burner (18) according to claim 5 or 6.

8. The inner contour of the recess (54) facing the closure element (52) in the release position (F) is adapted to the outer contour of the closure element (52) facing the inner contour in the release position (F). characterized in that A burner (18) according to any one of claims 1 to 7.

9. At least one wall region (W) of the chamber element (20) adjacent to the recess (52) is flush with the closure element (52) in the release position (F). characterized in that A burner (18) according to any one of claims 1 to 8.

10. 10. An internal combustion engine equipped with at least one burner according to any one of claims 1 to 9.

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