Exhaust system for motor vehicle, motor vehicle

Abstract

An exhaust system (1) for a motor vehicle (100) is proposed, wherein the exhaust system (1) has an exhaust burner (2), wherein the exhaust burner (2) has an intake connection (3) for introducing air into the exhaust burner (2), wherein the intake connection (3) has a connecting branch (5), in which a non-return valve (4) is arranged for closing the connecting branch (5), wherein the intake connection (3) has an intake flange (6) which connects the connecting branch (5) of the exhaust burner (2) to a combustion chamber (7) and seals the combustion chamber (7). In addition, a motor vehicle (100) is proposed.

Description

Technical Field

[0001] The invention relates to an exhaust system for a motor vehicle and to a motor vehicle. Background Art

[0002] On the road to increasingly environmentally friendly motor vehicles with combustion engines, the treatment of exhaust gases in the exhaust system of motor vehicles is becoming more and more of a focus. Increasingly stringent environmental regulations place high demands on exhaust gas purification components of the exhaust system, such as catalytic converters or particle filters.

[0003] Exhaust treatment in modern exhaust systems is quite complex. For example, the efficiency of the catalytic converter depends on its temperature. In particular, when a motor vehicle is cold started, the temperature of the catalytic converter is usually below the so-called light-off temperature, from which the catalytic converter operates efficiently. Other exhaust gas purification components, in particular the particle filter, must be brought to regeneration temperature from time to time in order to remove the soot particles deposited there.

[0004] It is known from document DE 10 2018 114 553A1 that the exhaust system is heated in order to reach a certain temperature. For this purpose, an air intake interface is provided for supplying air to an exhaust burner. In the exhaust burner, fuel residues in the exhaust gas that are added to the exhaust gas in a targeted manner by correspondingly controlling the combustion engine are burned together with the supplied air to increase the temperature. As disclosed in DE 10 2018 114 553A1, such an exhaust system can have a check valve that prevents a fluid (e.g., a fuel-air mixture) from flowing out of the exhaust burner. Such a check valve is usually firmly connected to the exhaust burner and is difficult to access for maintenance, so in the event of a failure of the check valve, the entire exhaust burner must usually be replaced or even the exhaust manifold must be replaced together with the exhaust burner. Summary of the invention

[0005] The object of the present invention is to provide an exhaust system which does not have the disadvantages mentioned in the prior art, but in which the nonreturn valve is installed in an easily accessible manner and can be manufactured advantageously.

[0006] This object is achieved by an exhaust system for a motor vehicle, wherein the exhaust system has an exhaust burner, wherein the exhaust burner has an intake interface for introducing air into the exhaust burner, wherein the intake interface has a connecting branch pipe, in which a check valve for closing the connecting branch pipe is arranged, wherein the intake interface has an intake flange, which connects the connecting branch pipe of the exhaust burner to a combustion chamber and seals the combustion chamber.

[0007] The exhaust system according to the invention makes it possible to easily replace a defective non-return valve. The non-return valve is connected to the combustion chamber via an intake flange, and the intake flange or the connecting branch arranged on the intake flange together with the non-return valve or only the non-return valve can be simply loosened and removed from the exhaust system. In addition, this allows significantly simpler assembly during production, thereby making it more cost-effective. It is preferably proposed that the intake flange is arranged on the outside of the exhaust burner. The intake flange is preferably screwed on the outside of the exhaust burner. The connecting branch is preferably configured for connection to an intake pipe or to an intake channel of a combustion engine or an intake channel of a separate air compressor.

[0008] Advantageous embodiments and improvements of the invention can be gathered from the description of preferred embodiments and with reference to the drawings.

[0009] According to a preferred embodiment of the present invention, it is proposed that the air intake flange is embodied as a turned part or a deep-drawn part; and / or the connecting branch is embodied as a turned part or a deep-drawn part. It is particularly preferred that the air intake flange is embodied as a deep-drawn part and the connecting branch is embodied as a turned part. This enables a very cost-effective, yet highly precise production of the air intake interface. Alternatively or additionally, it is preferably proposed that the air intake flange is made of plastic.

[0010] According to another preferred embodiment of the present invention, the non-return valve has a valve housing and a bell-shaped valve disk, wherein the valve disk is pressed against the valve housing in order to close the non-return valve. This enables a clean seal when the non-return valve is closed. It is preferably proposed that the valve disk is made of metal. It is preferably proposed that the valve housing is made of metal or plastic.

[0011] According to another preferred embodiment of the present invention, the valve disc is pressed with a first sealing surface of the valve disc against a second sealing surface of the valve housing to close the check valve, wherein no rubber coating for sealing is provided on the first sealing surface and the second sealing surface, wherein the first sealing surface and / or the second sealing surface are preferably made of metal. This advantageously prevents adhesion of the check valve, thereby ensuring that the check valve maintains a high response dynamic throughout its entire service life.

[0012] According to another preferred embodiment of the present invention, the valve disc is pressed against the second sealing surface of the valve housing with the first sealing surface of the valve disc in order to close the check valve, wherein a rubber coating for sealing is arranged on the first sealing surface and / or on the second sealing surface. By using the rubber coating, the requirements for the manufacturing accuracy of the sealing surface are reduced under the same sealing effect, thereby reducing the manufacturing cost.

[0013] According to another preferred embodiment of the present invention, the check valve is preferably preloaded in the closed position by means of a spring, wherein the preload is preferably adjustable by means of a threaded nut. This advantageously enables the response behavior of the check valve to be adjusted.

[0014] According to another preferred embodiment of the present invention, the non-return valve is clamped into the intake port, wherein the non-return valve can preferably be removed from the intake port without damage. This further simplifies the production and replacement of the non-return valve in an advantageous manner. It is conceivable that the valve housing has means (e.g. one or more fastening rings) for connecting to the intake port, in particular to the connecting branch, in a form-fitting manner. However, it is also conceivable that the non-return valve is screwed into the intake port, in particular the connecting branch.

[0015] According to another preferred embodiment of the present invention, the valve housing is embodied as a turned part, wherein the second sealing surface is preferably fine-turned. This allows cost-effective, yet highly accurate production of the check valve. However, it is also conceivable that the valve housing is made of plastic.

[0016] According to another preferred embodiment of the present invention, the valve housing is implemented as a formed stamped part made of metal and / or plastic. This can be done by sintering, extrusion or hot forming. This also makes it possible to cost-effectively and highly accurately manufacture the check valve.

[0017] According to another preferred embodiment of the present invention, the check valve has a guide rod, which is used to guide the valve disc between the open position of the check valve and the closed position of the check valve, wherein the guide rod is preferably supported at a support on the connecting branch, wherein the support is preferably arranged at a support receiving portion of the connecting branch, wherein the support receiving portion is particularly preferably conical. Thus, a very durable and highly precise check valve is provided in an advantageous manner. The guide rod is preferably made of metal. The support is preferably made of metal or plastic.

[0018] According to another preferred embodiment of the present invention, the valve disc is embodied as a stamped part or a deep-drawn part, wherein the first sealing surface is preferably polished. This allows cost-effective, yet highly accurate production of the check valve. Instead of a polished first sealing surface, it is conceivable that the first sealing surface is pressed.

[0019] A further subject matter of the invention for achieving the object stated in the introduction is a motor vehicle having an exhaust system according to the invention.

[0020] All details, features and advantages disclosed previously in conjunction with the exhaust system according to the invention also relate to the motor vehicle according to the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Further details, features and advantages of the invention will be apparent from the drawings and the following description of preferred embodiments with the aid of the drawings. These drawings merely illustrate exemplary embodiments of the invention and do not restrict the inventive concept.

[0022] Figure 1 A portion of an exhaust system according to an exemplary embodiment of the present invention is schematically illustrated.

[0023] FIG. 2( a ) and FIG. 2( b ) schematically illustrate an air intake interface of an exhaust system according to an exemplary embodiment of the present invention.

[0024] Figure 3 A nonreturn valve of an intake port of an exhaust system according to an exemplary embodiment of the present invention is schematically illustrated in an exploded view.

[0025] Figure 4 A motor vehicle according to an exemplary embodiment of the invention is schematically illustrated. DETAILED DESCRIPTION

[0026] Figure 1 A portion of an exhaust system 1 according to an exemplary embodiment of the present invention is schematically shown. The exhaust burner 2 of the exhaust system 1 can be identified. In the combustion chamber 7 of the exhaust burner 2, the fuel-air mixture is ignited as required by means of an ignition device 8. As a result, the exhaust system 1 and in particular its components (not shown here for the sake of clarity) can be heated to purify the exhaust gas. The air required for combustion is supplied via the intake port 3. The intake port 3 is arranged on the outside of the exhaust burner 2 and is preferably connected to the (not shown) air line of the combustion engine. The intake port 3 is shown in detail in Figures 2(a) and 2(b).

[0027] FIG. 2 (a) and FIG. 2 (b) schematically show an intake port 3 of an exhaust system 1 according to an exemplary embodiment of the present invention. FIG. 2 (a) and FIG. 2 (b) show the same intake port 3 with a closed check valve (FIG. 2 (a)) or an open check valve 4 (FIG. 2 (b)). The following description therefore refers to FIG. 2 (a) and FIG. 2 (b).

[0028] For simple installation on the outside of the exhaust burner (see Figure 1 ), the intake port 3 has an intake flange 6 which is implemented as a deep-drawn part or a turned part. The intake flange 6 is preferably screwed to the outside of the exhaust burner 2. The check valve 4 is clamped in the connecting branch 5 of the intake port 3. The connecting branch 5 is implemented as a turned part and is inserted and / or pressed or screwed into the intake flange 6 and / or welded, bonded or brazed to the intake flange.

[0029] The check valve 4 is inserted into the connecting piece 5 with the valve housing 4.1 and is clamped into the connecting piece 5 by means of a fastening ring 4.11 (e.g. a clamping ring). This allows for simple assembly and simple replacement of the check valve 4 without having to dismantle a large number of parts of the exhaust gas burner. For the lateral sealing of the check valve 4, a sealing ring 4.10 (e.g. an O-ring) is provided between the valve housing 4.1 and the connecting piece 5.

[0030] The check valve 4 also has a bell-shaped valve disc 4.2. The valve disc 4.2 is preferably embodied as a turned or stamped part and is guided between a closed position (FIG. 2(a)) and an open position (FIG. 2(b)) by means of a guide rod 4.7. For this purpose, a valve disc stop 4.9 is arranged at the lower end of the guide rod 4.7, which ensures that the valve disc 4.2 is firmly seated on the guide rod 4.7. In the closed position of the check valve 4, the valve disc 4.2 is arranged sealingly on the second sealing surface 4.4 of the valve housing 4.1 with a first sealing surface 4.3. The first sealing surface 4.3 and the second sealing surface 4.4 are preferably finely polished or profiled and do not have a rubber coating. Alternatively, it is also possible, however, for the rubber coating to be arranged on the first sealing surface 4.3 and / or the second sealing surface 4.4.

[0031] The non-return valve 4 is preloaded in the closed position by means of a spring 4.5. The preload can be adjusted by means of a threaded nut 4.6, which forms an upper stop for the spring 4.5. The spring 4.5 is arranged on the side opposite the threaded nut 4.6 in a manner abutting against a support element 4.8. The support element 4.8 supported in the valve housing 4.1 also serves to guide the guide rod 4.7 and thereby also to center the valve disk 4.2 relative to the valve housing 4.1.

[0032] Figure 3 The check valve 4 of the intake port of the exhaust system according to an exemplary embodiment of the present invention is schematically shown in an exploded view. The check valve 4 has a valve disk stop 4.9, a valve disk 4.2, a valve housing 4.1, a guide rod 4.7, a support 4.8, a spring 4.5 and a threaded nut 4.6.

[0033] Figure 4 A motor vehicle 100 according to an exemplary embodiment of the invention is schematically illustrated. The motor vehicle 100 has an exhaust system 1 according to an exemplary embodiment of the invention.

[0034] List of Reference Numerals

[0035] 1 Exhaust system

[0036] 2 Exhaust burners

[0037] 3 Air inlet port

[0038] 4 Check valve

[0039] 4.1 Valve housing

[0040] 4.2 Valve disc

[0041] 4.3 First sealing surface

[0042] 4.4 Second sealing surface

[0043] 4.5 Spring

[0044] 4.6 Threaded nuts

[0045] 4.7 Guide rod

[0046] 4.8 Supports

[0047] 4.9 Valve disc stop

[0048] 4.10 Sealing ring

[0049] 4.11 Fastening ring

[0050] 5 Connect branch pipe

[0051] 6 Inlet flange

[0052] 7 Combustion Chamber

[0053] 8 Ignition device

[0054] 100 Motor Vehicles

Claims

1. An exhaust system (1) for a motor vehicle (100), wherein the exhaust system (1) has an exhaust gas burner (2), The exhaust gas burner (2) has an air inlet port (3) for introducing air into the exhaust gas burner (2). The air inlet port (3) has a connecting branch (5), in which a check valve (4) is arranged for closing the connecting branch (5). It is characterized in that The air inlet interface (3) has an air inlet flange (6), which connects the connecting branch pipe (5) of the exhaust burner (2) to the combustion chamber (7) and seals the combustion chamber (7), wherein the air inlet flange (6) is screwed to the outside of the exhaust burner (2), and the check valve (4) has a valve housing (4.1) and a bell-shaped valve disk (4.2), wherein the valve disk (4.2) is pressed against the valve housing (4.1) in order to close the check valve (4), and the check valve (4) has a guide rod (4.7), the guide rod is used to guide the valve disc (4.2) between the open position of the check valve (4) and the closed position of the check valve (4), the guide rod (4.7) is supported on the support (4.8) on the connecting branch pipe (5), and the support (4.8) is arranged at the support accommodating portion of the connecting branch pipe (5), so that the intake flange or the connecting branch pipe arranged on the intake flange together with the check valve, or only the check valve, can be easily loosened and removed from the exhaust system.

2. The exhaust system (1) according to claim 1, characterized in that: The air inlet flange (6) is implemented as a turned part or a deep-drawn part; and / or the connecting branch (5) is implemented as a turned part or a deep-drawn part.

3. The exhaust system (1) according to claim 1, characterized in that: The valve disc (4.2) is pressed against a second sealing surface (4.4) of the valve housing (4.1) with a first sealing surface (4.3) of the valve disc (4.2) in order to close the check valve (4), wherein neither the first sealing surface (4.3) nor the second sealing surface (4.4) is provided with a rubber coating for sealing.

4. The exhaust system (1) according to claim 3, characterized in that: The first sealing surface (4.3) and / or the second sealing surface (4.4) are made of metal.

5. The exhaust system (1) according to claim 1, characterized in that: The valve disc (4.2) is pressed against a second sealing surface (4.4) of the valve housing (4.1) with a first sealing surface (4.3) of the valve disc (4.2) in order to close the check valve (4), wherein a rubber coating for sealing is arranged on the first sealing surface (4.3) and / or on the second sealing surface (4.4).

6. The exhaust system (1) according to any one of claims 1 to 5, characterized in that: The non-return valve (4) is preloaded in a closed position.

7. The exhaust system (1) according to claim 6, characterized in that: The non-return valve (4) is preloaded into a closed position by means of a spring (4.5).

8. The exhaust system (1) according to claim 6, characterized in that: The preload can be adjusted using the threaded nut (4.6).

9. The exhaust system (1) according to any one of claims 1 to 5, characterized in that: The non-return valve (4) is clamped into the air inlet port (3).

10. The exhaust system (1) according to claim 9, characterized in that The non-return valve (4) can be removed from the gas inlet port (3) without causing any damage.

11. The exhaust system (1) according to any one of claims 3 to 5, characterized in that: The valve housing (4.1) is embodied as a turned part.

12. The exhaust system (1) according to claim 11, characterized in that The second sealing surface (4.4) is precision-turned.

13. The exhaust system (1) according to claim 1, characterized in that The bearing element receptacle is conical.

14. The exhaust system (1) according to any one of claims 3 to 5, characterized in that: The valve disk (4.2) is embodied as a stamped or deep-drawn part.

15. The exhaust system (1) according to claim 14, characterized in that The first sealing surface is polished.

16. A motor vehicle (100) having an exhaust system (1) according to one of the preceding claims.

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