Combustor for exhaust gas system of internal combustion engine, in particular of motor vehicle, and internal combustion engine, in particular for motor vehicle

Abstract

The invention relates to a burner (18) of an exhaust gas system (10) of an internal combustion engine, having a combustion chamber (22) formed by chamber elements (20) of the burner (18), in which a mixture containing air as a first fluid and fuel as a second fluid is to be ignited and thus combusted, whereby components of the exhaust gas system (10), the invention relates to an exhaust gas system (10), in particular an exhaust gas aftertreatment element and / or exhaust gas flowing through an internal combustion engine of the exhaust gas system (10), having a channel (42), through which at least one of the fluids can flow and lead to a combustion chamber (22) and through which at least one fluid can be introduced into the combustion chamber (22), and having a closing element (52), through which the fluid can flow and lead to the combustion chamber (22). And a chamber element (20) movable relative to the chamber element (20) between a closed position (S) fluidly separating the channel (42) from the combustion chamber (22) and at least one release position (F) fluidly connecting the channel (42) to the combustion chamber (22), the chamber element (20) having a groove (54) in which a closure element (52) is at least partially accommodated in the release position (F).

Description

Technical Field

[0001] The invention relates to a burner for an exhaust system of an internal combustion engine according to the preamble of claim 1. The invention also relates to an internal combustion engine having at least one such burner. Background Art

[0002] DE 10 2021 001 580 A1 discloses a burner for an exhaust gas duct through which exhaust gases of an internal combustion engine of a motor vehicle can flow, the burner having a combustion chamber in which a mixture containing air and liquid fuel is ignited and thus burns. Summary of the Invention

[0003] The object of the present invention is to provide a burner for an exhaust system of an internal combustion engine and an internal combustion engine having at least one such burner, which allows particularly advantageous operation of the burner.

[0004] This object is achieved by a burner having the features of claim 1 and an internal combustion engine having the features of claim 10. Advantageous embodiments with suitable developments of the invention are specified in the remaining claims.

[0005] 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 exhaust gas duct. The internal combustion engine is also referred to as an engine or motor, and is, for example, configured as a reciprocating piston engine, and thus, in particular, as a reciprocating piston engine of a motor vehicle. This means that a motor vehicle, also referred to simply as a vehicle and preferably configured as an automobile, in particular a passenger car or a commercial vehicle, comprises an internal combustion engine in its fully manufactured state and can be driven by the internal combustion engine. In particular, the internal combustion engine is configured as a diesel engine, for example. During combustion operation of the internal combustion engine, a combustion process occurs in the internal combustion engine, in particular in at least one or more combustion chambers of the internal combustion engine, thereby generating exhaust gas from the internal combustion engine. The exhaust gas generated by the combustion process of the internal combustion engine is also referred to as engine exhaust gas. If exhaust gas is referred to above and below, unless otherwise specified, this refers to engine exhaust gas. The exhaust gas can flow out of the respective combustion chamber and into the exhaust system, and then through the exhaust system. At least one component, such as an exhaust gas aftertreatment element for after-treating the exhaust gas, can be arranged in the exhaust system. The exhaust gas aftertreatment element is or includes, for example, a catalyst, in particular an SCR catalyst. Selective catalytic reduction (SCR) can, for example, be catalytically supported and / or realized by means of the SCR catalyst, such that, for example, the SCR catalyst is catalytically active for SCR. During selective catalytic reduction (SCR), nitrogen oxides (NOx) that may be present in the exhaust gas are at least partially removed from the exhaust gas, since during the selective catalytic reduction, the nitrogen oxides react with ammonia to form nitrogen and water. The ammonia is provided, for example, by a liquid reducing agent, in particular a urea-water solution. Furthermore, the exhaust gas aftertreatment element can be or include a particle filter, in particular a diesel particle filter, wherein particles that may be present in the exhaust gas, in particular soot particles, can be filtered out of the exhaust gas by the particle filter.

[0006] The burner comprises a chamber element, preferably constructed as a solid, and a combustion chamber formed by the chamber element, particularly defined by the chamber element. In particular, the combustion chamber is defined, for example, by a cladding surface on the inner circumference of the chamber element, particularly directly. In the combustion chamber, a mixture, also referred to as a burner mixture, comprising air, also referred to as burner air, and preferably a liquid fuel, can be ignited and thereby burned. The combustion of the burner mixture, particularly in the combustion chamber, generates, for example, burner exhaust gas, also referred to as burner exhaust, particularly in the combustion chamber. The burner exhaust gas can, for example, flow from the combustion chamber and into an exhaust system, i.e., into an exhaust duct of the exhaust system, through which engine exhaust gas can flow, particularly at an introduction point located upstream of the aforementioned component, in the direction of flow of the engine exhaust gas flowing through the exhaust duct. For example, the burner exhaust gas can mix with the engine exhaust gas, particularly in the exhaust duct. Thus, the burner exhaust gas, particularly the burner exhaust gas mixed with the engine exhaust gas, can, for example, flow through the component, resulting in the component being heated, i.e., heated and / or kept warm. The air that forms the burner mixture with the preferably liquid fuel is also referred to as burner air. An internal combustion engine operates, for example, with the aid of, in particular, liquid fuel oil during its combustion operation. In particular, when the internal combustion engine is designed as a diesel engine, the fuel oil can be diesel fuel oil. In this case, it has proven particularly advantageous to use fuel oil as the fuel.

[0007] The burner air is the first fluid, also known as the first fluid. The fuel is the second fluid, also known as the second fluid. As the burner mixture is ignited and burned, components of the exhaust system, particularly exhaust aftertreatment components and / or engine exhaust gas flowing through the exhaust system, may be heated. The components may be indirectly heated or kept warm by the heated engine exhaust gas.

[0008] For example, the burner may comprise an ignition element, in particular an electrically operable ignition element, which, for example, passes through a through-hole in the chamber element and thereby protrudes into the combustion chamber. It is therefore particularly conceivable that the ignition element is at least partially arranged in the combustion chamber, in particular in such a way that one end, in particular the free end, of the ignition element is arranged in the combustion chamber and thereby protrudes into the combustion chamber. The burner mixture, in particular in the combustion chamber, can be ignited by means of the ignition element. For example, at least one ignition spark for igniting the burner mixture can be provided, i.e., generated, by means of the ignition element, in particular in the combustion chamber and / or by using electrical energy, so that the burner mixture in the combustion chamber can be ignited by the ignition spark. The ignition element may be, for example, a glow plug or a spark plug.

[0009] The burner also has at least one channel through which at least one fluid can flow, which channel itself, i.e., viewed in isolation, leads to the combustion chamber. To this end, the channel has, for example, at least one or exactly one outlet opening, through which the channel itself, i.e., viewed in isolation, leads to the combustion chamber. Thus, particularly during operation of the burner, at least one fluid can flow through the channel, in particular its outlet opening, thereby exiting the channel via the outlet opening and, in particular, flowing directly into the combustion chamber. It is conceivable that the tubing element, and therefore the outlet opening relative to the fluid, can be flowed through by exactly one fluid, so that, for example, after one fluid exits the channel, another fluid is supplied to or mixed with the other fluid. Furthermore, it is conceivable that both fluids can flow through the channel, thereby flowing through the outlet opening. Thus, both fluids can, for example, be introduced into the combustion chamber via the channel. A channel is also referred to as a tubing element, or a channel can be defined, in particular directly, by a tubing element, in particular a solid body. In this case, it is particularly conceivable that the channel is defined, in particular directly, by a cladding surface on the inner circumference of the tubing element.

[0010] The burner further comprises a closure element that is movable relative to a chamber element, preferably solid, between a closed position that fluidically separates the channel from the combustion chamber and at least one released position that fluidically connects the channel to the combustion chamber. This means that in the closed position, the channel is fluidically separated from the combustion chamber by the closure element, so that in the closed position, no or very little fluid—in particular, no fluid—can flow out of the conduit element and into the combustion chamber. The closed position is particularly advantageous because, in this position, no gas, such as engine exhaust gas, can penetrate from the combustion chamber into the channel. At the very least, the closed position prevents particles that may be present in the engine exhaust gas from entering the channel. For example, the combustion chamber is fluidically connected to the exhaust gas channel. For example, if the burner is deactivated, such that the burner is not providing burner exhaust gas, at least a portion of the engine exhaust gas flowing through the exhaust gas channel can, for example, flow into the combustion chamber and thereby penetrate or penetrate forward / enter the combustion chamber. Because the closure element is now in the closed position, particularly when the burner is deactivated, resulting in a fluidic separation of the passage from the combustion chamber, engine exhaust gas flowing into the combustion chamber cannot penetrate from the combustion chamber into the passage. This prevents engine exhaust gas or particles potentially contained therein from penetrating from the exhaust gas passage into, for example, undesirable areas of the burner. The burner comprises, for example, an inlet element, by means of which, in particular, liquid fuel can be introduced, in particular injected, into the burner air, in particular at an inlet point, which can be arranged upstream of the combustion chamber, in particular upstream of the outlet opening, in the direction of flow of the burner air flowing through the combustion chamber. Furthermore, the burner comprises, for example, an air passage through which the burner air can flow, which extends, for example, upstream of the outlet opening. Because the closure element is now in the closed position, particularly when the burner is deactivated or during the deactivation of the burner, resulting in a fluidic separation of the passage from the combustion chamber, for example, no engine exhaust gas can penetrate from the combustion chamber into the air passage and / or into the inlet element. This protects the air passage and / or the inlet element from engine exhaust gas, particularly when the burner is deactivated or during the deactivation of the burner.

[0011] In order to enable particularly advantageous operation of the burner, the invention provides a chamber element, in particular on or on its inner side facing the combustion chamber, a recess, also referred to as a pocket, in which, in the release position, the closure element is at least partially, in particular at least predominantly, and therefore at least more than half or completely, accommodated. As a result, in the release position of the closure element, a particularly flow-favorable contour, in particular an inner contour, of the combustion chamber can be ensured, thereby enabling particularly effective operation of the burner. In particular, the invention prevents the closure element from excessively impairing the flows occurring in the combustion chamber, in particular the burner air and / or the burner mixture, thereby enabling particularly effective operation of the burner. Furthermore, for example, in the release position, the closure element can be protected from excessive inflow or excessive flow around burner exhaust gases.

[0012] Thus, it is provided that, in the release position, at least one subregion of the closure element, also referred to as the placement region, in particular at least one main subregion, also referred to as the placement region, is at least halfway disposed in the recess, wherein, for example, in the closed position, the placement region is disposed outside the recess, in particular in the combustion chamber. Furthermore, it is conceivable, for example, that, relative to the entire region of the closure element, also referred to as the storage region, disposed in the release position, at least a portion, in particular at least a main portion, thus at least halfway disposed in the storage region, is disposed outside the recess, in particular in the combustion chamber, in the closed position. The storage region may be the entire closure element.

[0013] The present invention is based, inter alia, on the following findings and considerations: Internal combustion engines, in particular those for motor vehicles, are often equipped with a corresponding exhaust gas aftertreatment device. Exhaust gas aftertreatment can be performed by means of the corresponding exhaust gas aftertreatment device, or in the exhaust gas aftertreatment device, by which the corresponding exhaust gas from the corresponding internal combustion engine is aftertreated. The purpose of the exhaust gas aftertreatment can, in particular, be to reduce or eliminate pollutants, such as nitrogen oxides, that may be present in the exhaust gas. To enable the advantageous functioning of the exhaust gas aftertreatment device, and thus of the aforementioned exhaust gas aftertreatment elements, a minimum operating temperature of the exhaust gas aftertreatment device is often required. Internal combustion engines can have operating regions in which heating of the exhaust gas aftertreatment device solely by the engine exhaust gas is insufficient to heat the exhaust gas aftertreatment device to at least the operating temperature, or the exhaust gas aftertreatment device cannot be heated quickly enough, such as during a cold start of a gasoline engine. The exhaust gas aftertreatment device can be additionally heated by a burner. In operating regions in which the burner is not required and is therefore deactivated, it is preferably ensured that its components, for example, are protected from contamination. Burner components can be protected, in particular, by separating the passage from the combustion chamber fluid, as previously described, by a closure element in a closed position. Prior to startup, i.e., before the initially deactivated burner is activated, the closure element is moved, in particular pivoted, relative to the chamber element from a closed position to a released position, in particular in such a way that the closure element is moved, in particular pivoted, away from the passage, in particular away from the outlet opening. For example, if, in the released position, an excessive portion of the closure element is positioned in the combustion chamber, such that the excessive portion of the closure element is free standing in the combustion chamber in the released position, the closure element can be heated significantly, in particular until the closure element reaches a temperature corresponding to the temperature of the fuel gas surrounding the closure element, in particular the burner exhaust gas. Consequently, the closure element may need to be manufactured from expensive heat-resistant steel, and possibly high-nickel steel. Furthermore, if an excessive portion of the closure element in the released position is free standing in the combustion chamber, the flow of, for example, the mixture and / or the burner exhaust gas may be obstructed. This involves both the radial flow caused by the expansion of the fuel gas from the center of the combustion chamber (also called the combustion chamber) in the direction of downstream components, and the free flow of burner air (also called combustion air) from channels, also called feed lines, into the combustion chamber. As a result, excessive amounts of soot / carbon dioxide can be generated during burner operation, which can lead to undesirable emissions if appropriate countermeasures are not taken.

[0014] The aforementioned disadvantages can now be avoided since, in the release position, the closure element is at least partially, in particular at least predominantly or completely, accommodated in the recess.

[0015] For example, the combustion chamber, particularly on its inner circumference, is designed to be at least substantially rotationally symmetrical, wherein, for example, the chamber element and, therefore, the combustion chamber, for example, has, for example, an at least substantially rotationally symmetrical groove. In particular, it is conceivable that the groove is formed integrally on the chamber element and the combustion chamber as an at least rotationally symmetrical pocket. When the closure element is moved relative to the chamber element from a closed position to a released position, the closure element at least partially immerses in the groove. Preferably, in the released position, the closure element is arranged to a large extent or even completely in the groove so that the rotationally symmetrical interior of the combustion chamber, which is at least almost completely free of the closure element, remains empty, wherein this interior space is designed or can be used as a combustion volume. Particularly preferably, the closure element is immersed in the groove so that the side facing away from the combustion chamber is adjacent to the outer wall of the groove. In particular, the present invention can achieve at least the following advantages: since the closure element does not have excessive freedom in the combustion chamber in the released 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 to the environment through the outer wall. Excessively high temperatures of the closure element can thus be avoided, allowing, for example, cost-effective manufacture of the closure element. Since the closure element is immersed in the recess and thus accommodated in the recess in the released position, an at least nearly rotationally symmetrical region with no interfering contours can be created in the released position. This region is free of the closure element and forms at least a portion of the combustion chamber. This at least nearly rotationally symmetrical region can then generate particularly advantageous swirl flows, particularly of the burner mixture and / or burner air, which promote low carbon soot and efficient combustion. This allows for particularly efficient operation of the burner.

[0016] In order to enable particularly efficient and therefore particularly advantageous operation of the burner, in one embodiment of the invention, in the released position, at least one first subregion of the outer circumferential side of the cladding surface of the closure element, which in the released position faces the combustion chamber, and at least one second subregion of the inner circumferential side of the cladding surface of the chamber element, which in the released position is opposite the first subregion and faces the combustion chamber, in particular the interior space or region, in the released position, and the first subregion, forms a rotationally symmetrical region of the combustion chamber, also referred to as the combustion chamber region. The combustion chamber region is in particular completely free of the closure element, so that a particularly advantageous, in particular swirl-like, flow, in particular of the burner mixture and / or burner air, can be formed in the combustion chamber region.

[0017] Another embodiment is characterized in that, in the released position, at least one first subregion of the outer circumferential cladding surface of the closure element facing the combustion chamber in the released position and at least one second subregion of the inner circumferential cladding surface of the chamber element, opposite the first subregion in the released position and facing the combustion chamber and the first subregion in the released position, form a mirror-symmetrical region relative to at least one symmetry plane of the combustion chamber, also referred to as the combustion chamber region. For example, the first portion of the outer circumferential cladding surface can be the first subregion of the outer circumferential cladding surface. Furthermore, it is conceivable that the second portion of the inner circumferential cladding surface is the second subregion of the inner circumferential cladding surface. Furthermore, it is conceivable that the chamber region is the aforementioned combustion chamber region. In this case, a straight line extending in the symmetry plane is also provided, which extends through the outlet opening of the passageway, which leads to the combustion chamber via the outlet opening, in particular, such that the straight line passes through the center of the outlet opening. For example, the outlet opening is circular, thus in the form of a circle, whose center, for example, coincides with the center of the outlet opening and lies on the straight line. As a result, a particularly advantageous, in particular swirling, flow, in particular of the burner mixture and / or the burner air, can be formed in the chamber region, so that a particularly efficient operation of the burner can be achieved.

[0018] In another particularly advantageous embodiment of the present invention, the closure element in the released position is at least predominantly, that is, at least more than half or completely, disposed in the recess. This prevents excessive heating of the closure element and creates particularly favorable flow conditions in the combustion chamber. This ensures particularly efficient operation of the burner.

[0019] Another embodiment is characterized in that the closure element is pivotable relative to the chamber element about a pivot axis between a release position and a closed position. In this case, the closure element comprises, for example, a lever, which is pivotable relative to the chamber element about a pivot axis between a release position (also referred to as an open position) and a closed position, and comprises a closure part, also referred to as a lid or flap / plate, a closure flap / plate or a closure lid. The closure part is constructed separately from the lever and is held on the lever, whereby the closure part can be pivoted together with the lever between a release position and a closed position relative to the chamber element about the pivot axis.

[0020] In the closed position, the closure portion covers the outlet opening of the channel, thereby fluidically isolating the channel from the combustion chamber or at least covering it. In the released position, the closure portion releases the outlet opening, thereby fluidically connecting the channel to the combustion chamber via the outlet opening. In particular, the closure portion in the released position does not overlap the outlet opening. This allows for particularly safe and robust movement of the closure element between the released and closed positions, thereby enabling particularly advantageous operation of the burner.

[0021] In this case, it has proven particularly advantageous if the pivot axis passes through the groove. As a result, the closure element can be accommodated in the groove to a very large extent, ie a very large part or even completely, thereby ensuring particularly advantageous operation of the burner.

[0022] Another embodiment is characterized in that the closure part is held on the lever with clearance, thereby allowing limited movement relative to the lever. In other words, the lever and the closure part are constructed in multiple parts, i.e., separate from one another, and with a certain clearance between them, i.e., they are held together. As a result, for example, when the closure element is moved into the closed position, the closure part can rest flush and / or tightly against the tubular element, in particular against the end face of the tubular element facing the combustion chamber, thereby reliably closing the outlet opening, for example, which is configured as a hole, thereby sealing or at least covering the outlet opening.

[0023] The lever and the closure element held thereon form, for example, a lever mechanism, which, in the released position, is accommodated in a recess, referred to as a pocket, in a flow-facilitating manner. In particular, the lever mechanism can be accommodated in the pocket without undercuts, sharp edges, or abrupt transitions in the released position. The closure element, in particular the lever mechanism, is specifically designed to ensure good heat transfer between the closure element and the chamber element (also referred to as the housing). To this end, for example, a large-volume design of the closure element is provided to ensure favorable heat transfer. The pocket (also referred to as the pocket) of the chamber element is preferably designed so that only a small gap is created between the closure element and the pocket, in particular the contour, particularly the inner contour, of the pocket. For example, the pocket may have a contour, particularly an inner contour, identical to the contour, particularly the outer contour, of the closure element, wherein, for example, the inner contour of the pocket only provides clearance for thermal expansion of the closure element relative to the outer contour of the closure element. Alternatively or additionally, for example, the closure element, in particular the lever, may have a radius, on its combustion chamber side, identical or at least similar to that of the combustion chamber, in the released position, thereby creating a flow-facilitating arrangement.

[0024] In another particularly advantageous embodiment of the invention, the inner contour of the recess facing the closure element in the release position matches the outer contour of the closure element facing the inner contour in the release position. As a result, the closure element can be accommodated particularly largely or even completely in the recess, thereby ensuring a flow-favorable shape of the combustion chamber, in particular the inner contour.

[0025] Finally, it has proven particularly advantageous if at least one wall region of the chamber element adjoining the recess is flush with the closure element in the release position. As a result, favorable flow conditions can be achieved in the combustion chamber, thereby enabling efficient operation of the burner.

[0026] A second aspect of the invention relates to an internal combustion engine having at least one burner according to the first aspect of the invention. Advantages and advantageous designs of the burner according to the invention should be regarded as advantages and advantageous designs of the internal combustion engine according to the invention, and vice versa. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Further advantages, features, and details of the present invention are given in the following description of preferred embodiments and with reference to the accompanying drawings. The above-mentioned features and combinations of features mentioned in the description, as well as the features and combinations of features mentioned in the description of the drawings and / or shown alone in the drawings, can be used not only in the respective combination but also in other combinations or alone without departing from the scope of the present invention.

[0028] In the figure:

[0029] Figure 1 shows a section of a schematic sectional view of an internal combustion engine of a motor vehicle having a burner, wherein a closure element of the burner is in a released position;

[0030] Figure 2 Shown along Figure 1 A schematic cross-sectional view of an internal combustion engine shown along section line AA; and

[0031] Figure 3 A detail of another schematic sectional view of an internal combustion engine is shown, wherein the closure element is in the closed position.

[0032] In the figures, identical or functionally identical elements are provided with the same reference signs. DETAILED DESCRIPTION

[0033] Figure 1 A schematic cross-sectional view of a portion of an internal combustion engine of a motor vehicle is shown. In particular, Figure 1 An exhaust system 10, also called an exhaust gas duct, of an internal combustion engine is partially shown. The exhaust system has an exhaust gas line element 12, which has an exhaust gas duct 14, in particular a limited, in particular directly limited duct. The internal combustion engine can be operated in combustion mode. During its combustion mode, the internal combustion engine provides exhaust gas, also called engine exhaust gas, which can flow through the exhaust gas duct 14. Figure 1In the figure, arrow 16 shows the engine exhaust gas flowing through the exhaust gas duct 14. The internal combustion engine has a burner 18 arranged in the exhaust system 10, by means of which the engine exhaust gas and / or components of the exhaust system 10 can be heated. For this purpose, the burner 18 has a chamber element 20 which is particularly designed as solid and a combustion chamber 22, which is formed by the chamber element 20, in particular defined by the chamber element 20. In particular, the combustion chamber 22 is defined, in particular directly, by a cladding surface 24 on the inner circumferential side of the chamber element 20. In the combustion chamber 22, a mixture, also called a burner mixture, can be ignited and thus burnt. The burner mixture comprises air, also called burner air. Furthermore, the burner air is also called a first fluid. Furthermore, the burner mixture comprises in particular a liquid fuel, also called a second fluid. The ignition and combustion of the burner mixture produces exhaust gases of the burner 18, also called burner exhaust gases, wherein the burner exhaust gases are Figure 1 , indicated by arrow 26. It can be seen that chamber element 20 has a flow opening 28, via which combustion chamber 22 is fluidically connected to exhaust gas duct 14. Burner exhaust gas can flow through flow opening 28, exiting combustion chamber 22 at introduction point E and flowing into exhaust gas duct 14, whereby the burner exhaust gas is introduced into the engine exhaust gas. As a result, the engine exhaust gas is heated, or a total exhaust gas comprising engine and burner exhaust gas is formed, which can flow from introduction point E through exhaust system 10, in particular exhaust gas duct 14. This is indicated by arrow 30. For example, at least one exhaust gas aftertreatment element is arranged in exhaust system 10 downstream of introduction point E, by means of which the engine and burner exhaust gases can be aftertreated. The exhaust gas aftertreatment element can be heated and / or maintained warm by the heating of the engine exhaust gas, or the hot total exhaust gas, or the burner exhaust gas. As a result, for example, the exhaust gas aftertreatment element can reach its operating or start-up temperature, also known as the ignition temperature, particularly quickly.

[0034] An air supply device 32 is provided, through which the burner 18, in particular the combustion chamber 22, can be supplied with burner air. To this end, the air supply device 32 has an air channel 34 through which the burner air can flow. Arrow 36 indicates the flow of the burner air through the air channel 34. The air channel 34 is formed, for example, by a component 38 of the burner 18, which is in particular constructed as a solid body. The air supply device 32 can have an air line (not shown) through which the burner air can flow. For example, the air line can be constructed separately from the component 38 and mechanically connected to the component 38, wherein the air line is fluidically connected to the air channel 34. As a result, the burner air flowing through the air line can flow out of the air line and into the air channel 34, and then flow through the air channel 34 so that, for example, the burner air can be supplied to the combustion chamber 22, i.e., introduced into the combustion chamber 22, in particular by means of the air channel 34. In particular, it is conceivable that the air line is mechanically connected to the component 38 by means of a V-band clamp, as a result of which a particularly simple and therefore time- and cost-effective assembly can be achieved.

[0035] The burner 18 also has an inlet element 40, through which fuel can be introduced, in particular injected into the burner air at an inlet point. In particular, the inlet point is arranged upstream of the combustion chamber 22 in the direction of flow of the burner air through the burner 18, and therefore outside of 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.

[0036] The burner 18, in particular the component 38, has a channel 42, for example, through which at least one fluid can flow. In the embodiment shown in the figures, both fluids, namely the fuel and the burner air, can flow through the channel 42, in particular in such a way that a burner mixture containing the fluids can flow through the channel 42.

[0037] In this case, the burner air can be introduced from the air channel 34 into the channel 42, so that the channel 42 can be supplied with the burner air flowing through the air channel 34 by means of the air channel 34. This means in particular that the air channel 34 is arranged or extends upstream of the channel 42 in the flow direction of the burner air flowing through the air channel 34 and the channel 42. Furthermore, the fuel can be introduced, in particular directly, in particular injected into the channel 42 by means of the introduction element 40, so that the channel 42 can be supplied with fuel by means of the introduction element 40. Thus, the introduction point is arranged, for example, in the channel 42, wherein the introduction point is arranged upstream of the combustion chamber 22. Furthermore, from Figure 1It can be seen that the air channel 34 is arranged upstream of the combustion chamber 22 or extends upstream of the combustion chamber 22. Burner air and fuel can flow through the channel 42, in particular in a mixed state, and be introduced into the combustion chamber 22 through the channel 42. For this purpose, the channel 42 has an outlet opening 44, through which the channel 42 opens into the combustion chamber 22.

[0038] For example, the outlet opening 44 is rotationally symmetrical with respect to the line 46. For example, the outlet opening 44 is circular and thus in the form of a circle whose center lies on the line 46. The midpoint is also referred to as the center of the outlet opening 44 or the center of the outlet opening 44. The fact that fuel is supplied to the introduction element 40 is indicated by the arrow 48.

[0039] exist Figure 1 In FIG. 1 , arrows 50 show that the burner 18, in particular a swirl generator (not shown in greater detail) of the burner 18, generates a swirl of the burner air and thus of the burner mixture in the combustion chamber 22. This means that the burner air and therefore the burner mixture flow in a swirling manner at least in the combustion chamber 22. As a result, the burner air and fuel can be advantageously mixed with one another.

[0040] The burner 18 also has a closing element 52, which is configured as a lever mechanism in the embodiment shown in the figures. The closing element 52 can be moved relative to the chamber element 20. Figure 1 The release position F and Figure 3 In the embodiment shown in the figures, the closure element 52 can be pivoted relative to the chamber element 20 about the pivot axis SA between the closed position S and the release position F. In the closed position S, the channel 42 is fluidically separated from the combustion chamber 22 by the closure element 52 ( Figure 3 In the release position F, the closing element 52 releases the outlet opening 44 and thus the channel 42, so that in the release position F the channel 42 is fluidically connected to the combustion chamber 22 via its outlet opening 44 ( Figure 1 ).

[0041] In order to enable particularly advantageous operation of the burner 18, the chamber element 20, in particular the cladding surface 24 of the inner circumferential side of the chamber element 20, has a recess 54, also referred to as a pocket, in which the closure element 52 is at least partially, in particular at least predominantly, thus at least more than half or completely, accommodated in the release position F. This can be seen from Figure 2 It is particularly clear that the burner 18 is along Figure 1The schematic sectional view of the section line AA is shown. It can be seen that due to the fact that the closure element 52 is at least partially accommodated in the bag in the release position F, a particularly flow-favorable region B of the combustion chamber 22, also referred to as the inner space, can be achieved, wherein a swirl can be formed particularly advantageously in this region B. In particular, the region B is an at least substantially rotationally symmetrical region of the combustion chamber 22. Alternatively or additionally, for example, the region B is an at least substantially mirror-symmetrical region of the combustion chamber 22, wherein the mirror-symmetrical region is mirror-symmetrical with respect to the plane of symmetry, i.e. axis-symmetrical, and wherein the straight line 46 extends in the plane of symmetry. The plane of symmetry is in Figure 2 In the figure, EB1 is used, wherein, for example, a second symmetry plane EB2 is also shown, wherein the straight line 46 extends therein, wherein, for example, the region B can also be mirror-symmetrical with respect to the symmetry plane EB2, i.e. axially symmetrical. Figure 1 As can be seen, region B in the release position F is formed, for example, by a first subregion TB1 of the closure element 52 and a second subregion TB2 of the outer circumferential cladding surface 24. The first subregion TB1 is a first subregion of the outer circumferential cladding surface 56 of the closure element 52, and the second subregion TB2 is a second subregion of the inner circumferential cladding surface 24 of the chamber element 20. In the release position F, the first subregion TB1 faces the outer circumferential cladding surface 56 of the closure element 52, which is located near the combustion chamber 22. In particular, in the release position F, a portion of the combustion chamber 22 is directly bounded by subregion TB1. In the release position F, subregion TB2 opposes subregion TB1, and in the release position F, the second subregion TB2 of the combustion chamber 22 faces the first subregion TB1. Specifically, for example, a second portion of the combustion chamber 22 in the release position F is directly bounded by subregion TB2. For example, the first sub-region TB1 is a first portion of the coating surface 56 on the outer circumference side, and for example, the second sub-region TB2 is a second portion of the coating surface 24 on the inner circumference side.

[0042] In the embodiment shown in the figures, the closing element 52 has a lever 58, which can be pivoted relative to the chamber element 20 between a closed position S and a release position F about a pivot axis SA, and has a closing portion 60, which is also referred to as a flap or a closing flap. The closing portion 60 is constructed separately from the lever 58 and is held on the lever 58 so that the closing portion 60 can be pivoted together with the lever 58 between the release position F and the closed position S relative to the chamber element 20 about the pivot axis SA. In the closed position S, the outlet opening 44 is covered by the closing portion 60, as a result of which the channel 42 is fluidically separated from the combustion chamber 22. In the release position F, the closing portion 60 releases the outlet opening 44 so that in the release position F, the closing portion 60 does not overlap with the outlet opening 44. As a result, the channel 42 is fluidically connected to the combustion chamber 22 via the outlet opening 44. For example, the closing portion 60 is held on the lever 58 in a limited movable manner. As a result, in the closed position S ( Figure 3 ), the closing portion 60 can advantageously rest against the tubular element 62, in particular against the end face 64 of the tubular element 62 facing the combustion chamber 22, thereby advantageously sealing the outlet opening 44 and thereby blocking the fluid. The tubular element 62 is a solid body, wherein the channel 42 is defined by the tubular element 62, in particular by a cladding surface 66 on the inner circumference of the tubular element 62, in particular directly. For example, the tubular element 62 is the component 38 or is formed integrally with the component 38. In other words, for example, the component 38 and the tubular element 62 are formed from a single piece. Furthermore, it is conceivable that the component 38 and the tubular element 62 are separate from each other and connected to each other.

[0043] In addition, from Figure 1 and Figure 3 It can be seen that in the release position F, the wall area W of the chamber element 20 adjacent to the groove 54 on both sides is flush with the closing element 52, in particular the covering surface 56 on its outer circumferential side, and very particularly flush with the sub-area TB1, so that the area B can be constructed to be particularly conducive to flow.

[0044] Furthermore, it is provided that the inner contour of the recess 54 facing the closing element 52 in the release position F matches the outer contour of the closing element 52 facing the inner contour in the release position F, so that the inner contour and the outer contour have the same shape. In other words, the outer contour has a positive shape, wherein the inner contour has a negative shape adapted to the positive shape or corresponding to the positive shape. For example, the outer contour facing the inner contour faces away from the sub-area TB1. Furthermore, from Figures 1 to 3It can be seen that in the release position F, at least a subregion (also referred to as a placement region or storage region) of the closure element 52 is arranged in the recess 54. With respect to the entire placement region of the closure element 52 in the release position F arranged in the recess 54, in the closed position S at least a portion, in this case a major portion, thus more than half, of the placement region arranged in the release position F in the recess 54 is arranged outside the recess 54, in particular in the combustion chamber 22.

[0045] Reference Signs List

[0046] 10 Exhaust system

[0047] 12 Exhaust pipe components

[0048] 14 exhaust gas channels

[0049] 16 arrows

[0050] 18 burners

[0051] 20 chamber components

[0052] 22 combustion chamber

[0053] 24 inner circumferential coating surface

[0054] 26 arrows

[0055] 28 flow openings

[0056] 30 arrows

[0057] 32 air supply device

[0058] 34 air channels

[0059] 36 arrows

[0060] 38 components

[0061] 40 Introducing components

[0062] 42 channels

[0063] Exit 44

[0064] 46 straight line

[0065] 48 arrows

[0066] 50 arrows

[0067] 52 closure element

[0068] 54 grooves

[0069] 56 outer circumferential coating surface

[0070] 58 Leverage

[0071] 60 closed part

[0072] 62 pipeline components

[0073] 64 end face

[0074] 66 inner circumferential coating surface

[0075] E introduction point

[0076] Area B

[0077] TB1 first sub-region

[0078] TB2 second subregion

[0079] EB1 symmetry plane

[0080] EB2 symmetry plane

[0081] F Release position

[0082] S closed position

Claims

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), in which a mixture of air as a first fluid and fuel as a second fluid is to be ignited and thus burns, whereby 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), can be heated; a channel (42) through which at least one of the fluids can flow and which opens into the combustion chamber (22), and 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) fluidically isolating the passage (42) from the combustion chamber (22) and at least one released position (F) fluidically connecting the passage (42) to the combustion chamber (22), It is characterized by: The chamber element (20) has a recess (54) in which the closure element (52) is at least partially accommodated in the release position (F).

2. The burner (18) according to claim 1, It is characterized by: In the release position (F), at least one first sub-region (TB1) of the covering surface (56) on the outer circumferential side of the closing element (52) and at least one second sub-region (TB2) of the covering surface (24) on the inner circumferential side of the chamber element (20) form a rotationally symmetrical region (B) of the combustion chamber (22), the at least one first sub-region facing the combustion chamber (22) in the release position (F), and the at least one second sub-region opposite to the first sub-region (TB1) in the release position (F) and facing the combustion chamber (22) and the first sub-region (TB1) in the release position (F).

3. The burner (18) according to claim 1 or 2, It is characterized by: In the release position (F), at least one first sub-region (TB1) of the cladding surface (56) on the outer circumferential side of the closure element (52) facing the combustion chamber (22) in the release position (F) and at least one second sub-region (TB2) of the cladding surface (24) on the inner circumferential side of the chamber element (20) opposite to the first sub-region (TB1) in the release position (F) and facing the combustion chamber (22) and the first sub-region (TB1) in the release position (F) form a mirror-symmetrical region (B) relative to at least one symmetry plane (EB1) of the combustion chamber (22), wherein a straight line (46) extends in the symmetry plane (EB1), the straight line extending through the outlet opening (44) of the channel (42), the channel leading to the combustion chamber (22) via the outlet opening (44) of the channel, in particular through the center of the outlet opening (44).

4. Burner (18) according to any one of the preceding claims, It is characterized by: In the release position (F), the closure element (52) is at least predominantly or completely arranged in the recess (54).

5. Burner (18) according to any one of the preceding claims, It is characterized by: The closure element (52) has: A lever (58) capable of pivoting relative to the chamber element (20) about a pivot axis (SA) between the release position (F) and the closed position (S), and a closure portion (60) constructed separately from the lever (58) and retained on the lever (58), the closure portion and the lever (58) being capable of pivoting together relative to the chamber element (20) about the pivot axis (SA) between the release position (F) and the closed position (S), the closure portion covering and thereby fluidically blocking the outlet opening (44) of the channel (42) through which the channel leads to the combustion chamber (22), and releasing the outlet opening (44) in the release position (F).

6. The burner (18) according to claim 5, It is characterized by: The pivot axis (SA) extends through the groove (54).

7. Burner (18) according to claim 5 or 6, It is characterized by: The closing portion (60) is held on the lever (58) with play so as to be movable in a limited manner relative to the lever (58).

8. Burner (18) according to any one of the preceding claims, It is characterized by: The inner contour of the recess (54) facing the closure element (52) in the release position (F) matches the outer contour of the closure element (52) facing the inner contour in the release position (F).

9. Burner (18) according to any one of the preceding claims, It is characterized by: At least one wall region (W) of the chamber element (20) adjoining the recess (52) is flush with the closure element (52) in the release position (F).

10. An internal combustion engine comprising at least one burner according to any one of the preceding claims.

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