Burner for an Exhaust Gas System of an Internal Combustion Engine, in Particular of a Motor Vehicle, and Internal Combustion Engine, in Particular for a Motor Vehicle

Abstract

A burner for an exhaust gas system of an internal combustion engine includes a combustion chamber formed by a chamber element where a mixture of air as a first fluid and fuel as a second fluid is ignitable such that a component of the exhaust gas system and/or exhaust gas of the internal combustion engine that is flowable through the exhaust gas system is heatable. A channel through which at least one of the fluids is flowable opens into the combustion chamber and via the channel the at least one of the fluids is introducible into the combustion chamber. A closure element is moveable relative to the chamber element between a closed position fluidically separating the channel from the combustion chamber and a release position fluidically connecting the channel to the combustion chamber. The chamber element has a recess in which the closure element is received in the release position.

Description

BACKGROUND AND SUMMARY OF THE INVENTION

The invention relates to a burner for an exhaust gas system of an internal combustion engine. Furthermore, the invention relates to an internal combustion engine with at least one such burner.

A burner for an exhaust gas tract through which exhaust gas of an internal combustion engine of a motor vehicle can flow is known from DE 10 2021 001 580 A1, having a combustion chamber in which a mixture comprising air and a liquid fuel is to be ignited and thus burned.

The object of the present invention is to create a burner for an exhaust gas system of an internal combustion engine and an internal combustion engine with at least one such burner, such that a particularly advantageous operation of the burner can be realized.

A first aspect of the invention relates to a burner for an exhaust gas system, also referred to as an exhaust gas tract, of an internal combustion engine, also referred to as a combustion motor, motor, or internal combustion machine, and formed, for example, as a reciprocating piston engine, thus as a reciprocating piston machine, in particular of a motor vehicle. This means that the motor vehicle, also referred to simply as a vehicle and preferably formed as a car, in particular as a passenger car or utility vehicle, has, in its fully manufactured state, the internal combustion engine and can be driven by means of the internal combustion engine. In particular, the internal combustion engine is formed, for example, as a diesel engine. During fired operation of the internal combustion engine, combustion processes take place in the internal combustion engine, in particular in at least one or more combustion chambers of the internal combustion engine, resulting in exhaust gas from the internal combustion engine. The exhaust gas of the internal combustion engine resulting from the combustion processes is also referred to as engine exhaust gas. When reference is made above and below to the exhaust gas, this refers to the engine exhaust gas, unless otherwise stated. The exhaust gas can flow out of the respective combustion chamber and into the exhaust gas system, and subsequently flow through the exhaust gas system. At least one component, such as an exhaust gas aftertreatment element, for example, for aftertreating the exhaust gas, can be arranged in the exhaust system. The exhaust gas aftertreatment element is or comprises, for example, a catalyst, in particular an SCR catalyst, wherein, for example, selective catalytic reduction (SCR) can be catalytically supported and/or effected by means of the SCR catalyst, such that, for example, the SCR catalyst is catalytically active for the SCR. During selective catalytic reduction (SCR), any nitrogen oxides (NOx) contained in the exhaust gas are at least partially removed from the exhaust gas by the nitrogen oxides reacting with ammonia to form nitrogen and water during the selective catalytic reduction. The ammonia is provided, for example, by a reducing agent, in particular a liquid one. The liquid reducing agent is, in particular, an aqueous urea solution. Furthermore, the exhaust gas aftertreatment element can be or comprise a particle filter, in particular a diesel particle filter, wherein any particles contained in the exhaust gas, in particular soot particles, can be filtered out of the exhaust gas by means of the particle filter.

The burner has a chamber element, preferably formed as a solid body, and a combustion chamber, which are formed, in particular delimited, by the chamber element. In particular, the combustion chamber is delimited, for example, by an inner peripheral lateral surface of the chamber element, in particular directly. In the combustion chamber, a mixture also referred to as burner mixture, which comprises air, also referred to as burner air, and a preferably liquid fuel, can be ignited and thereby combusted. The combustion of the burner mixture taking place in particular in the combustion chamber generates, for example, an exhaust gas from the burner, also referred to as burner exhaust gas. The burner exhaust gas can, for example, flow out of the combustion chamber and into the exhaust system, i.e., for example, into an exhaust gas channel of the exhaust gas system through which the engine exhaust gas can flow, in particular at an inlet point which is arranged, for example, upstream of the aforementioned component in the flow direction of the engine exhaust gas flowing through the exhaust gas channel. For example, the burner exhaust gas can mix with the engine exhaust gas, in particular in the exhaust gas channel. As a result, the burner exhaust gas, in particular the burner exhaust gas mixed with the engine exhaust gas, can flow through the component, for example, whereby the component can be heated, i.e., warmed and/or kept warm. The air that forms the burner mixture with the preferably liquid fuel is also referred to as burner air. The internal combustion engine is operated in its fired mode, for example, by means of a fuel, in particular a liquid fuel. In particular when the internal combustion engine is formed as a diesel engine, the fuel can be diesel fuel. Here, it has proved to be particularly advantageous when the fuel is used as the combustible.

The burner air is a first fluid or is also referred to as the first fluid. The fuel is a second fluid, or is also referred to as the second fluid. By igniting and combusting the burner mixture, a component of the exhaust gas system, in particular an exhaust aftertreatment element, and/or the engine exhaust gas flowing through the exhaust system can be heated. The component can be indirectly heated or kept warm via the heated engine exhaust gas.

For example, the burner has an ignition element, in particular an electrically operable one, which, for example, penetrates a through-opening of the chamber element and thereby protrudes, for example, into the combustion chamber. Thus, it is conceivable, in particular, for the ignition element to be arranged at least partially in the combustion chamber, in particular in such a way that an in particular free end of the ignition element is arranged in the combustion chamber, thus protruding into the combustion chamber. The burner mixture can be ignited, in particular in the combustion chamber, 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 using electrical energy, such that the burner mixture can be ignited in the combustion chamber, in particular by means of the ignition spark. The ignition element can, for example, be formed as a glow plug or as a spark plug.

Moreover, the burner has at least one channel through which at least one of the fluids can flow, which in itself, i.e., considered on its own, opens into the combustion chamber. For this purpose, the channel has, for example, at least or exactly one outlet opening, via which the channel in itself, i.e., considered on its own, opens into the combustion chamber. Thus, in particular during operation of the burner, the at least one fluid can flow through the channel and in particular the outlet opening of the channel and thus flow out of the channel via the outlet opening and, in particular, flow directly into the combustion chamber. It is conceivable that the line element and thus the outlet opening can be flowed through by exactly one of the fluids with regard to the fluids, such that, for example, the other fluid is supplied to the one fluid or mixed with the other fluid after the one fluid has flowed out of the channel. Furthermore, it is conceivable that the channel and thus the outlet opening can be flowed through by the two fluids. Thus, for example, the two fluids can be introduced into the combustion chamber by means of the channel. The channel is also referred to as a line element, or the channel is, for example, delimited, in particular directly, by a line element, in particular formed as a solid body. Here, it is conceivable, in particular, that the channel is delimited, in particular directly, by an inner peripheral lateral surface of the line element.

Moreover, the burner has a closure element which can be moved relative to the chamber element, which is preferably formed as a solid body, between a closed position fluidically separating the channel from the combustion chamber and at least one release position fluidically connecting the channel to the combustion chamber. This means that, in the closed position, the channel is fluidically separated from the combustion chamber by means of the closure element, such that in the closed position no or only a small amount of fluid, i.e., in particular none of the fluids, can flow out of the line element and into the combustion chamber. The closed position is particularly advantageous in that in the closed position no gas, such as engine exhaust gas, for example, can penetrate from the combustion chamber into the channel. At the very least, the closed position prevents any particles contained in the engine exhaust gas from entering the channel. For example, the combustion chamber is fluidically connected to the exhaust gas channel. If, for example, the burner is deactivated such that the burner does not provide any burner exhaust gas, thus at least one portion of the engine exhaust gas flowing through the exhaust gas channel can flow into the combustion chamber, thus penetrating or advancing into the combustion chamber. Since the closure element is in the closed position, in particular when the burner is deactivated, whereby the channel is fluidically separated from the combustion chamber, the engine exhaust gas flowing into the combustion chamber cannot penetrate from the combustion chamber into the channel, such that the engine exhaust gas or any particles contained therein from the exhaust gas channel cannot, for example, penetrate into undesired regions of the burner. The burner has, for example, an introduction element by means of which the in particular liquid fuel can be introduced, in particular injected, into the burner air, in particular at an introduction point which can be arranged upstream of the combustion chamber and in particular upstream of the outlet opening in the flow direction of the burner air flowing through the combustion chamber. Furthermore, the burner has, for example, an air channel through which the burner air can flow, which air channel runs, for example, upstream of the outlet opening. Since the closure element is in the closed position, in particular when or while the burner is deactivated, whereby the channel is fluidically separated from the combustion chamber, for example, no engine exhaust gas from the combustion chamber can penetrate into the air channel and/or reach the introduction element, such that the air channel and/or the introduction element can be protected from the engine exhaust gas or, in particular, when or while the burner is deactivated.

In order to be able to achieve particularly advantageous operation of the burner, it can be provided according to the invention that the chamber element, in particular at or on its inner side facing towards the combustion chamber, has a recess, also referred to as a pocket, in which the closure element is at least partially, in particular at least predominantly and thus at least more than half or even completely, received in the release position. Thus, a particularly streamlined contour, in particular inner contour, of the combustion chamber in the release position of the closure element is ensured, such that particularly efficient operation of the burner can be achieved. In particular, excessive impairment of a flow taking place in the combustion chamber, in particular of the burner air and/or the burner mixture, by the closure element can be avoided as a result of the invention, such that particularly efficient operation of the burner can be achieved. Furthermore, the closure element can, for example, be protected in the release position from excessive flow onto or around the burner exhaust gas.

Thus, it is provided that, in the release position, at least one partial region, also referred to as the arrangement region, in particular at least one predominant partial region, also referred to as the arrangement region, and thus at least more than half, of the closure element is arranged in the recess, wherein, for example, in the closed position, the arrangement region is arranged outside the recess and in particular in the combustion chamber. Furthermore, it is conceivable that, for example, with respect to the entire region of the closure element arranged in the recess in the release position, also referred to as the stowage region, at least one part, in particular at least one predominant part and thus at least more than half, of the stowage region is arranged outside the recess and in particular in the combustion chamber in the closed position. The stowage region can be the entire closure element.

The invention is based in particular on the following findings and considerations: internal combustion engines, in particular for motor vehicles, are usually equipped with a respective exhaust gas aftertreatment device. By means of the respective exhaust gas aftertreatment device, exhaust gas aftertreatment can be carried out, by means of which or during which the respective exhaust gas of the respective internal combustion engine is aftertreated. The aim of the exhaust gas aftertreatment can in particular be to reduce or eliminate any pollutants contained in the exhaust gas, such as nitrogen oxides. In order to be able to realize an advantageous function of the exhaust gas aftertreatment device, and thus of the aforementioned exhaust gas aftertreatment element, a minimum operating temperature of the exhaust gas aftertreatment device is usually required. The internal combustion engine can have operating ranges in which heating of the exhaust gas aftertreatment device solely by the engine exhaust gas is not sufficient in order to heat the exhaust gas aftertreatment device at least to the operating temperature, or the exhaust gas aftertreatment device cannot be heated to the operating temperature sufficiently quickly, for example during a cold start of the internal combustion engine. By means of the burner, it is possible to additionally heat the exhaust gas aftertreatment device. In such operating ranges in which the burner is not required and is thus deactivated, it is preferably ensured that parts of the burner are protected, for example, from contamination. The parts of the burner can in particular be protected in such a way that, as previously described, the channel becomes or is fluidically separated from the combustion chamber by means of the closure element in the closed position. Before initial operation, i.e., before activation of the initially deactivated burner, the closure element is, for example, moved, in particular pivoted, relative to the chamber element from the closed position to the release position, in particular in such a way that the closure element is moved, in particular pivoted, away from the channel, in particular from the outlet opening. If, for example, an excessively large part of the closure element is arranged in the combustion chamber in the release position in such a way that an excessively large part of the closure element stands freely in the combustion chamber in the release position, this can thus lead to significant heating of the closure element, in particular to the point where the closure element has a temperature that corresponds to a temperature of the combustion gases surrounding the closure element. In particular, the combustion gases include the burner exhaust gas. As a result, it may be necessary to manufacture the closure element from cost-intensive, heat-resistant, and likely high-nickel-content steels. Moreover, when an excessively large portion of the closure element is exposed in the combustion chamber in the release position, this could impede gas flow, for example of the mixture and/or the burner exhaust gas. This affects both a radial flow resulting from the expansion of the combustion gases from a center of the combustion chamber, also referred to as the combustion chamber, towards the component arranged downstream, as well as a free flow of burner air, also referred to as combustion air, from the channel, also referred to as the supply line, into the combustion chamber. This can result in an excessive amount of soot being produced during burner operation, which can lead to undesirable emissions if no appropriate countermeasures are taken.

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

For example, the combustion chamber, in particular on the inner periphery, is formed to be at least substantially rotationally symmetrical, wherein, for example, the chamber element and thus the combustion chamber has the, for example, at least substantially rotationally symmetrical recess. In particular, it is conceivable for the recess to be formed as an at least rotationally symmetrical pocket on the chamber element and the combustion chamber. If the closure element is moved from the closed position into the release position relative to the chamber element, then the closure element is at least partially immersed in the recess. Preferably, the closure element is arranged so extensively or even completely in the recess in the release position that a rotationally symmetrical interior of the combustion chamber remains free, which is at least almost completely free of the closure element, wherein the interior is formed or can be used as a combustion volume. Particularly preferably, the closure element is immersed in the recess to such an extent that a side facing away from the combustion chamber is in the immediate vicinity of an outer wall of the recess. In particular, at least the following advantages can be realized by the invention: since the closure element is not excessively free in the combustion chamber in the release position, the closure element absorbs only a small amount of combustion heat. For example, the closure element can release at least part of the absorbed combustion heat back to the environment via the outer wall. This can prevent excessive temperatures in the closure element, such that the closure element can be manufactured cost-effectively, for example. Because the closure element is immersed in the recess, and is thus received in the recess in the release position, an at least almost rotationally symmetrical region without interfering contours can be created in the release position, wherein the region is free of the closure element and forms at least one part of the combustion chamber. In this at least almost rotationally symmetrical region, a particularly advantageous swirl flow, in particular of the burner mixture and/or the burner air, can then develop, which is conducive to low-soot and efficient combustion. This enables particularly efficient operation of the burner.

In order to be able to be able to realize a particularly efficient and thus a particularly advantageous operation of the burner, it is provided in an embodiment of the invention that, in the release position, at least one first partial region of an outer peripheral lateral surface of the closure element, which in the release position faces towards the combustion chamber, in particular the interior or the region, and at least one second partial region of an inner peripheral lateral surface of the chamber element, which in the release position faces towards the combustion chamber and the first partial region, form 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, such that a particularly advantageous, in particular swirling, flow, in particular of the burner mixture and/or the burner air, can form in the combustion chamber region.

A further embodiment is characterized in that, in the release position, at least one first part of the outer peripheral lateral surface of the closing element, which in the release position faces towards the combustion chamber, and at least one second part of the inner peripheral lateral surface of the chamber element, which in the release position, is opposite the first part and, in the release position, faces towards the combustion chamber and the first part, form a region of the combustion chamber that is mirror-symmetrical with respect to at least one plane of symmetry and is also referred to as a chamber region. For example, the first part of the outer peripheral lateral surface can be the first partial region of the outer peripheral lateral surface. Furthermore, it is conceivable that the second part of the inner peripheral lateral surface is the second partial region of the inner peripheral lateral surface. Furthermore, it is conceivable that the chamber region is the aforementioned combustion chamber region. Here, it is furthermore provided that a straight line runs in the plane of symmetry, the straight line passing through the outlet opening of the channel, which opens into the combustion chamber via its outlet opening, in particular in such a way that the straight line runs through the center of the outlet opening. For example, the outlet opening is formed to be circular and thus in the shape of a circle, the center of which coincides, for example, with the center of the outlet opening and lies on the straight line. In doing so, a particularly advantageous, in particular swirling, flow, in particular of the burner mixture and/or the burner air, can form in the chamber region, such that particularly efficient operation of the burner can be achieved.

In a further, particularly advantageous embodiment of the invention, it is provided that the closure element is arranged at least predominantly, i.e., at least by more than half, or completely in the recess in the release position. Thus, excessive heating of the closure element is avoided, and particularly flow-optimized conditions can be created in the combustion chamber. Thus, particularly efficient operation of the burner can be ensured.

A further embodiment is characterized in that the closure element can be pivoted around a pivot axis relative to the chamber element between the release position and the closed position. Here, the closure element comprises, for example, a lever that can be pivoted around the pivot axis relative to the chamber element between the release position, also referred to as the open position, and the closed position, and a closure part, which is also referred to as a cap or flap, closure flap, or closure cap. The closure part is formed separately from the lever and held on the lever, whereby the closure part can be pivoted together with the lever relative to the chamber element around the pivot axis between the release position and the closed position.

In the closed position, the closure part covers the outlet opening of the channel, whereby the channel is fluidically separated or at least covered from the combustion chamber. In the release position, the closure part exposes the outlet opening, whereby the channel is fluidically connected to the combustion chamber via the outlet opening. In particular, the closure part does not overlap with the outlet opening in the release position. In doing so, a particularly secure, and therefore robust, movement of the closure element between the release position and the closed position can be realized, such that particularly advantageous operation of the burner can be realized.

It has been shown to be particularly advantageous when the pivot axis runs through the recess. Thus, the closure element can be received extensively, i.e., to a very large extent or even completely, in the recess, such that particularly advantageous operation of the burner can be ensured.

A further embodiment is characterized in that the closure part is held on the lever with a certain amount of play and can thus be moved to a limited extent relative to the lever. In other words, the lever and the closure part are multi-part, i.e., formed separately from each other and designed with a certain amount of play between them, i.e., held together. As a result, when the closure element is moved into the closed position, the closure part can, for example, lie flush and/or tightly against or on the line element, in particular against or on an end face of the line element facing towards the combustion chamber, in order to thus securely close the outlet opening, which may be formed, for example, as a bore, and thus to seal it or at least cover it.

The lever and the closure part held thereon form, for example, a lever mechanism which, in the release position, is received in the recess referred to as a depression in a streamlined manner. In particular, the lever mechanism can be received in the recess in the release position without undercuts, sharp edges, or abrupt transitions. The closure element, in particular the lever mechanism, is designed in particular in such a way that good heat transfer is ensured between the closure element and the chamber element, also referred to as the housing. For this purpose, a large-volume design of the closure element is provided, for example, in order to be able to guarantee advantageous heat transport. Preferably, the recess of the chamber element, also referred to as a pocket, is designed in such a way that only a small gap emerges between the closure element and the recess, in particular a contour and very particularly an inner contour of the recess. For example, the recess has the same contour, in particular inner contour, as a contour, in particular outer contour, of the closure element, wherein, for example, the inner contour of the recess is only enlarged relative to the outer contour of the closure element by a clearance for thermal expansion of the closure element. Alternatively or additionally, for example, the closure element, in particular the lever, has on its combustion chamber side in the release position the same or at least a similar radius as the combustion chamber, such that a streamlined arrangement can be realized.

In a further, particularly advantageous embodiment of the invention, it is provided that an inner contour of the recess facing towards the closure element in the release position is adapted to an outer contour of the closure element facing towards the inner contour in the release position. This allows the closure element to be received particularly extensively or even completely in the recess, whereby a streamlined shape, in particular the inner contour, of the combustion chamber can be guaranteed.

Finally, it has been shown to be particularly advantageous when at least one wall region of the chamber element adjacent to the recess is flush with the closure element in the release position. Thus, streamlined flow conditions in the combustion chamber can be realized, such that efficient burner operation can be realized.

A second aspect of the invention relates to an internal combustion engine which has at least one burner according to the first aspect of the invention. Advantages and advantageous designs of the burner according to the invention are to be regarded as advantages and advantageous designs of the internal combustion engine according to the invention, and vice versa.

Further advantages, features and details of the invention emerge from the subsequent description of a preferred exemplary embodiment and by means of the drawings. The features and feature combinations mentioned above in the description and the features and feature combinations mentioned below in the description of the figures and/or shown only in the figures can be used not only in the respectively specified combination, but also in other combinations or on their own without leaving the scope of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic sectional view of an internal combustion engine of a motor vehicle with a burner, wherein a closure element of the burner is in a release position;

FIG. 2 is a schematic sectional view of the internal combustion engine along a sectional line A-A shown in FIG. 1; and

FIG. 3 is a further schematic sectional view of the internal combustion engine, wherein the closure element is in a closed position.

DETAILED DESCRIPTION OF THE DRAWINGS

In the figures, the same or functionally identical elements are provided with the same reference numbers.

FIG. 1 shows, in sections in a schematic sectional view, an internal combustion engine of a motor vehicle. In particular, in FIG. 1 in sections, an exhaust gas system 10 of the internal combustion engine, also referred to as the exhaust tract, is depicted. The exhaust gas system has an exhaust gas line element 12 which has an exhaust gas channel 14, in particular a delimited and very particularly directly delimited one. The internal combustion engine can be operated in a fired mode. In its fired mode, the internal combustion engine provides exhaust gas, also referred to as engine exhaust gas, which can flow through the exhaust gas channel 14. In FIG. 1, the engine exhaust gas flowing through the exhaust gas channel 14 is illustrated by an arrow 16. The internal combustion engine has a burner 18 arranged in the exhaust gas system 10, by means of which burner the engine exhaust gas and/or components of the exhaust gas system 10 can be heated. For this purpose, the burner 18 has a chamber element 20, which is in particular formed as a solid body, and a combustion chamber 22, which is formed, in particular delimited, by the chamber element 20. In particular, the combustion chamber 22 is delimited, in particular directly, by an inner peripheral lateral surface 24 of the chamber element 20. In the combustion chamber 22, a mixture, also referred to as burner mixture, can be ignited and thus burned. The burner mixture comprises air, which is also referred to as burner air. Moreover, the burner air is also referred to as the first fluid. Moreover, the burner mixture comprises a fuel, in particular a liquid fuel, which is also referred to as the second fluid. The ignition and combustion of the burner mixture produces an exhaust gas, also referred to as burner exhaust gas, from the burner 18, wherein the burner exhaust gas is illustrated in FIG. 1 by arrows 26. It can be seen that the chamber element 20 has flow-through openings 28, via which the combustion chamber 22 is fluidically connected to the exhaust gas channel 14. The burner exhaust gas can flow through the flow openings 28 and thus flow out of the combustion chamber 22 at an inlet point E and into the exhaust gas channel 14, whereby the burner exhaust gas is introduced into the engine exhaust gas. In doing so, the engine exhaust gas is heated, or a combined exhaust gas comprising the engine exhaust gas and the burner exhaust gas is formed, which can flow through the exhaust gas system 10, in particular the exhaust gas channel 14, from the inlet point E. This is illustrated by arrows 30. For example, at least one exhaust gas aftertreatment element is arranged in the exhaust gas system 10 downstream of the inlet point E, by means of which exhaust gas aftertreatment element the engine exhaust gas and also the burner exhaust gas can be aftertreated. By means of the described heating of the engine exhaust gas or by means of the hot combined exhaust gas or by means of the burner exhaust gas, the exhaust gas aftertreatment element can be warmed up and/or kept warm, whereby, for example, the exhaust gas aftertreatment element can be brought particularly quickly to its operating or starting temperature, also referred to as the light-off temperature.

An air supply 32 is provided, by means of which the burner 18, in particular the combustion chamber 22, can be supplied with burner air. For this purpose, the air supply 32 has an air channel 34 through which the burner air can flow. An arrow 36 illustrates a 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 designed, in particular, as a solid body. The air supply 32 can have an air channel not depicted in the figures through which the burner air can flow. For example, the air line is formed separately from the component 38 and is mechanically connected to the component 38, wherein the air line is fluidically connected to the air channel 34. Thus, the burner air flowing through the air line can flow out of the air line and into the air channel 34 and subsequently flow through the air channel 34, such that, for example, the burner air can be supplied to the combustion chamber 22, i.e., can be introduced into the combustion chamber 22, in particular via 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, whereby particularly simple and thus time- and cost-effective assembly can be realized.

The burner 18 also has an introduction element 40, by means of which the fuel can be introduced, in particular injected, into the burner air at an introduction point. In particular, the introduction point is arranged upstream of the combustion chamber 22 in the flow direction of the burner air flowing through the burner 18 and thus 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.

The burner 18, in particular the component 38, has a channel 42 through which, for example, at least one of the fluids can flow. In the exemplary embodiment shown in the figures, the channel 42 can be flowed through by the two fluids, i.e., both the fuel and the burner air, in particular in such a way that the channel 42 can be flowed through by the burner mixture comprising the fluids.

In the present case, the burner air can be introduced from the air channel 34 into the channel 42, such 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 runs upstream of the channel 42 in the flow direction of the burner air flowing through the air channel 34 and the channel 42. Moreover, the fuel can be introduced, in particular injected, into the channel 42, in particular directly, by means of the introduction element 40, such that the channel 42 can be supplied with the fuel by means of the introduction element 40. The introduction point is thus arranged, for example, in the channel 42, wherein the introduction point is arranged upstream of the combustion chamber 22. Moreover, it can be seen from FIG. 1 that the air channel 34 is arranged or runs upstream of the combustion chamber 22. The burner air and the fuel, in particular in a mixed state, can flow through the channel 42 and flow into the combustion chamber 22 via the channel 42, thus are introduced. For this purpose, the channel 42 has an outlet opening 44, through which the channel 42 opens into the combustion chamber 22.

For example, the outlet opening 44 is formed to be rotationally symmetric with respect to a straight line 46. Here, for example, the outlet opening 44 is formed to be circular and thus in the shape of a circle, the center of which lies on the straight line 46. The center is also referred to as the center of the outlet opening 44 or is the center of the outlet opening 44. An arrow 48 illustrates that the introduction element 40 is supplied with the fuel.

In FIG. 1, arrows 50 illustrate that a swirling flow of the burner air and thus of the burner mixture in the combustion chamber 22 is effected by means of the burner 18, in particular by means of a swirl generator of the burner 18 not depicted in more detail. This means that the burner air and thus the burner mixture flow in a swirling manner, at least in the combustion chamber 22. Thus, the burner air and the fuel can be advantageously mixed with each other.

The burner 18 also has a closure element 52, which in the exemplary embodiment shown in the figures is formed as a lever mechanism. The closure element 52 can be moved relative to the chamber element 20 between at least one release position F shown in FIG. 1 and a closed position S shown in FIG. 3. In the exemplary embodiment shown in the figures, the closure element 52 can be pivoted around a pivot axis SA relative to the chamber element 20 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 means of the closure element 52 (FIG. 3). In the release position F, the closure element 52 releases the outlet opening 44 and thus the channel 42, such that in the release position F, the channel 42 is fluidically connected to the combustion chamber 22 via its outlet opening 44 (FIG. 1).

In order to be able to realize particularly advantageous operation of the burner 18, the chamber element 20, in particular the inner peripheral lateral surface 24 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 and thus at least more than half or completely, received in the release position F. This can be seen particularly well in FIG. 2, in which the burner 18 is shown in a schematic sectional view along a sectional line A-A shown in FIG. 1. It can be seen that because the closure element 52 is at least partially received in the pocket in the release position F, a particularly streamlined region B of the combustion chamber 22, also referred to as the interior space, can be realized, wherein the swirling flow can form particularly advantageously in the 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 a plane of symmetry, i.e., axially symmetrical, and wherein the straight line 46 runs in the plane of symmetry. The plane of symmetry is labelled with EB1 in FIG. 2, wherein, for example, a second plane of symmetry EB2 is also shown, in which the straight line 46 runs, wherein, for example, the region B can also be mirror-symmetrical with respect to the plane of symmetry EB2, i.e., axially symmetrical. For example, from FIG. 1 it can be seen that the region B in the release position F is formed, for example, by a first partial region TB1 of the closure element 52 and by a second partial region TB2 of the inner peripheral lateral surface 24. The first partial region TB1 is a first partial region of an outer peripheral lateral surface 56 of the closure element 52, and the second partial region TB2 is a second partial region of the inner peripheral lateral surface 24 of the chamber element 20. In the release position F, the first partial region TB1 of the outer peripheral lateral surface 56 of the closure element 52 faces towards the combustion chamber 22, in particular in such a way that in the release position F, a part of the combustion chamber 22 is directly delimited by the partial region TB1. In the release position F, the partial region TB2 lies opposite the partial region TB1, wherein in the release position F, the second partial region TB2 of the combustion chamber 22 faces towards the first partial region TB1. In particular, for example, a second part of the combustion chamber 22 is directly delimited by the partial region TB2 in the release position F. For example, the first partial region TB1 is a first part of the outer peripheral lateral surface 56, and for example, the partial region TB2 is a second part of the outer peripheral lateral surface 24.

In the exemplary embodiment shown in the figures, the closure element 52 has a lever 58 which can be pivoted around the pivot axis SA relative to the chamber element 20 between the closed position S and the release position F, and a closure part 60, which is also referred to as a flap or closure flap. The closure part 60 is formed separately from the lever 58 and held on the lever 58, such that the closure part 60 can be pivoted together with the lever 58 around the pivot axis SA relative to the chamber element 20 between the release position F and the closed position S. In the closed position S, the outlet opening 44 is covered by the closure part 60, whereby the channel 42 is fluidically separated from the combustion chamber 22. In the release position F, the closure part 60 releases the outlet opening 44 in such a way that, in the release position F, the closure part 60 is not arranged to overlap with the outlet opening 44. Thus, the channel 42 is fluidically connected to the combustion chamber 22 via the outlet opening 44. For example, the closure part 60 is held on the lever 58 with limited movement. Thus, in the closed position S (FIG. 3), the closure part 60 can advantageously bear against a line element 62, in particular against an end face 64 of the line element 62 facing towards the combustion chamber 22, whereby the outlet opening 44 can be advantageously sealed and thus fluidically blocked. The line element 62 is a solid body, wherein the channel 42 is delimited, in particular directly delimited, by the line element 62, in particular by an inner peripheral lateral 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 piece. Furthermore, it is conceivable that the component 38 and the line element 62 are formed separately from one another and connected to one another.

Moreover, it can be seen from FIGS. 1 and 3 that wall regions W of the chamber element 20 adjoining the recess 54 on both sides are flush with the closure element 52 in the release position F, in particular with its outer peripheral lateral surface 56 and in particular with the partial region TB1, such that the region B can be formed in a particularly streamlined manner.

Moreover, it is provided that an inner contour of the recess 54 facing towards the closure element 52 in the release position F is adapted to an outer contour of the closure element 52 facing towards the inner contour in the release position F, such 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. Here, for example, the outer contour facing towards the inner contour faces away from the partial region TB1. Furthermore, it can be seen from FIGS. 1 to 3 that in the release position F, at least one partial region of the closure element 52, also referred to as an arrangement region or stowage region, is arranged in the recess 54. In relation to the entire arrangement region of the closure element 52 arranged in the recess 54 in the release position F, in the closed position S at least one part, in this case a predominant part and thus more than half, of the arrangement region arranged in the recess 54 in the release position F is arranged outside the recess 54 and in particular in the combustion chamber 22.

List of reference characters:
10  Exhaust gas system
12  Exhaust gas line element
14  Exhaust gas channel
16  Arrow
18  Burner
20  Chamber element
22  Combustion chamber
24  Inner peripheral lateral surface
26  Arrows
28  Throughflow opening
30  Arrows
32  Air supply
34  Air channel
36  Arrow
38  Component
40  Introduction element
42  Channel
44  Outlet opening
46  Straight line
48  Arrow
50  Arrows
52  Closure element
54  Recess
56  Outer peripheral lateral surface
58  Lever
60  Closure part
62  Line element
64  End face
66  Inner peripheral lateral surface
E   Introduction point
B   Region
TB1 First partial region
TB2 Second partial region
EB1 Plane of symmetry
EB2 Plane of symmetry
F   Release position
S   Close position

Claims

1.-10. (canceled)

11. A burner (18) for an exhaust gas system (10) of an internal combustion engine, comprising:

a combustion chamber (22) formed by a chamber element (20), wherein in the combustion chamber (22) a mixture which comprises air as a first fluid and a fuel as a second fluid is ignitable and combustible, whereby a component of the exhaust gas system (10) and/or exhaust gas of the internal combustion engine that is flowable through the exhaust gas system (10) is heatable;

a channel (42) through which at least one of the first fluid and the second fluid is flowable, wherein the channel (42) opens into the combustion chamber (22) and wherein via the channel (42) the at least one of the first fluid and the second fluid is introducible into the combustion chamber (22); and

a closure element (52) which is moveable relative to the chamber element (20) between a closed position(S) fluidically separating the channel (42) from the combustion chamber (22) and a release position (F) fluidically connecting the channel (42) to the combustion chamber (22);

wherein the chamber element (20) has a recess (54) in which the closure element (52) is at least partially received in the release position (F).

12. The burner (18) according to claim 11, wherein, in the release position (F), at least one first partial region (TB1) of an outer peripheral lateral surface (56) of the closure element (52) facing toward the combustion chamber (22) in the release position (F) and at least one second partial region (TB2) of an inner peripheral surface (24) of the chamber element (20) opposite the first partial region (TB1) in the release position (F) and facing toward 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).

13. The burner (18) according to claim 11, wherein, in the release position (F), at least one first partial region (TB1) of an outer peripheral lateral surface (56) of the closure element (52) facing toward the combustion chamber (22) in the release position (F) and at least one second partial region (TB2) of an inner peripheral lateral surface (24) of the chamber element (20) opposite the first partial region (TB1) in the release position (F) and facing toward the combustion chamber (22) and the first partial region (TB1) in the release position (F) form a region (B) of the combustion chamber (22) which is mirror-symmetrical with respect to a plane of symmetry (EB1), wherein a straight line (46) runs in the plane of symmetry (EB1), and wherein the straight line (46) runs through a center of an outlet opening (44) of the channel (42) which opens into the combustion chamber (22).

14. The burner (18) according to claim 11, wherein the closure element (52) is disposed at least predominantly or completely in the recess (54) in the release position (F).

15. The burner (18) according to claim 11, wherein the closure element (52) has a lever (58) which is pivotable around a pivot axis (SA) relative to the chamber element (20) between the release position (F) and the closed position(S) and has a closure part (60) which is formed separately from the lever (58) and is held on the lever (58) so as to be pivotable with the lever (58) relative to the chamber element (20) around the pivot axis (SA) between the release position (F) and the closed position(S), wherein the closure part (60), in the closed position(S), covers and thus fluidically blocks an outlet opening (44) of the channel (42) which opens into the combustion chamber (22) and, in the release position (F), releases the outlet opening (44).

16. The burner (18) according to claim 15, wherein the pivot axis (SA) runs through the recess (54).

17. The burner (18) according to claim 15, wherein the closure part (60) is held on the lever (58) with a play and is thus limitedly moveable relative to the lever (58).

18. The burner (18) according to claim 11, wherein an inner contour of the recess (54) facing toward the closure element (52) in the release position (F) is adjusted to an outer contour of the closure element (52) facing toward the inner contour in the release position (F).

19. The burner (18) according to claim 11, wherein at least one wall region of the chamber element (20) adjoining the recess (54) is flush with the closure element (52) in the release position (F).

20. An internal combustion engine, comprising:

the burner according to claim 11.