Device for discharging condensate water from exhaust system

Abstract

An apparatus for discharging condensate water from an exhaust system includes a housing configured to be secured to a piping component of the exhaust system and having an inlet in fluid communication with the piping component and an outlet to the atmosphere. An inlet and an outlet are arranged spaced apart from each other, and a discharge element formed of a porous material is arranged in the housing between the inlet and the outlet.

Description

Technical Field

[0001] This invention relates to a device for removing condensate from an exhaust system. Background Technology

[0002] During the combustion process in an internal combustion engine, a certain amount of water vapor will accumulate depending on the operating conditions. It condenses on relatively cool surfaces in the exhaust system and accumulates as condensate in certain areas of the exhaust system, especially in the rear area.

[0003] To expel condensate from the rear of the exhaust system, an exhaust pipe can be installed in the rear muffler area. This pipe draws in water via the Venturi effect, atomizes it in the flowing exhaust gases, and then blows it out through the exhaust pipe. This exhaust method is only effective during internal combustion engine operation.

[0004] Increasingly, significant amounts of condensation are also forming in the central region of the exhaust system, particularly in hybrid engines and / or during short-distance operation. This poses a problem because the condensation can splash around during driving actions such as braking and acceleration, potentially wetting catalytic converter components and / or filter components. Such wetting can impair the function of the corresponding exhaust treatment components and is therefore undesirable. Another issue is that modern exhaust systems also contain sensors sensitive to condensation, which should also not be wetted. In the central region of the exhaust system, it is not possible to remove condensation through atomization. Summary of the Invention

[0005] Therefore, the object of the present invention is to provide a device that can effectively discharge condensate from the exhaust system's distribution area.

[0006] This objective is achieved by a device having the following characteristics.

[0007] The device according to the invention includes a housing configured to be fastened to a piping component of an exhaust system and having an inlet in fluid communication with the piping component and an outlet to the atmosphere.

[0008] According to the present invention, the inlet and outlet are arranged spaced apart from each other, and the discharge element formed of porous material is arranged between the inlet and outlet in the housing.

[0009] The spacing between the inlet and outlet creates a labyrinth effect, counteracting exhaust gas escape and increased noise pollution. The porous material transports condensate to the outlet via capillary action, eliminating the need for the Venturi effect. This means the device according to the invention can also be positioned in the middle region of the exhaust system, for example, between the catalytic converter and the tail muffler. The porous material also suppresses exhaust gas escape and prevents condensate from flowing directly out of the outlet. Such unobstructed flow would lead to undesirable puddles forming below the exhaust system. In the device according to the invention, a small amount of water is continuously discharged, i.e., slowly dripping, during operation and when the system is stopped.

[0010] The emission element can extend from the inlet to the outlet, for example, extending entirely from the inlet to the outlet. However, depending on the application requirements, it may be sufficient if the emission element only extends along a portion of the transport path to be covered between the inlet and the outlet.

[0011] The porosity of the porous material can be at least 0.1, preferably at least 0.2.

[0012] The housing preferably has a fastening flange configured to rest against the lower outer wall of the piping component, with the outlet formed on the lower inner or lower side of the housing opposite the fastening flange. The fastening flange facilitates the retrofitting of existing venting systems with the device for draining condensate according to the invention. For this purpose, only an opening needs to be provided in the piping component at the location of the inlet connecting to the housing. The outlet arrangement in the lower region of the housing facilitates the drainage of water by gravity.

[0013] The fastening flange can be adapted to the external contours of the piping component. For example, if the housing is configured for fastening to the flat underside of the muffler housing, the fastening flange can extend in a plane. However, the fastening flange can also have a curved path to facilitate fastening to the underside of the exhaust pipe.

[0014] According to one embodiment of the invention, the vertical axis of the housing is defined by the relative arrangement between the fastening flange and the lower side, and the distance between the inlet and outlet has a component in the horizontal direction relative to the vertical axis. This horizontal offset between the inlet and outlet prevents a gravity-driven vertical fluid path, thereby offsetting unwanted leakage and increased noise pollution.

[0015] According to one embodiment of the invention, the horizontal component is at least 1 cm and at most 60 cm, preferably at least 5 cm and at most 30 cm. This has proven particularly advantageous in practice for emission performance and leakage control.

[0016] The lower side of the housing may have at least one protrusion, but the discharge element does not extend into the protrusion. In the installed state of the housing, the protrusion forms a recess, serving as a collection chamber for condensate. Water moves from the collection chamber to the discharge element via capillary action and then moves there toward the outlet. The ability to perform intermediate storage in the collection chamber improves the efficiency of the device.

[0017] The discharge element may include at least one capillary body formed of a fibrous material. This capillary body has a wicking effect, thereby ensuring a continuous flow of condensate to the outlet. The capillary body is preferably made of a heat-resistant fibrous material. According to one specific embodiment, the capillary body is made of glass wool, for example based on E-glass (electro-optical glass) or ECR glass (electro-corrosion resistant glass), and / or made of aramid fiber fleece.

[0018] The discharge element may include at least one capillary body formed of sintered metal. According to a particularly preferred embodiment of the invention, the discharge element includes at least one capillary body formed of fibrous material, and further includes at least one capillary body formed of sintered metal. The capillary bodies formed of fibrous material and sintered metal may be arranged front and rear relative to the connection path between the inlet and outlet.

[0019] According to one specific embodiment of the invention, the housing includes a basin-shaped base having a basin bottom and a basin opening on one side, a fastening flange forming a basin bottom, an inlet forming a recess in the basin bottom, and the basin opening on one side being covered by a cover having an outlet. This makes the design particularly simple.

[0020] It can be specified that the shell includes a cup-shaped deep-drawn portion having a one-sided cup opening and a peripheral edge band. The one-sided cup opening forms an inlet, the edge band forms a fastening flange, and the outlet is preferably located in the sidewall of the cup-shaped deep-drawn portion. This design occupies very little structural space in the flow direction.

[0021] The housing may optionally include a sleeve that engages at least partially around the piping component. This housing can be attached to the piping assembly in a manner similar to a pipe clamp. A portion of the sleeve positioned against the underside of the pipe, such as the lower half of the sleeve, can thereby form a fastening flange.

[0022] Spacing-out holes or channels can be installed as outlets. This supports distributed condensate drainage.

[0023] In addition, bumps and / or ridges can be embossed on the housing as positioning aids for the discharge element. For example, the position of the capillary body within the housing can be easily positioned using bumps and / or ridges.

[0024] The present invention also relates to an exhaust system for a motor vehicle, comprising a piping component designed as described above and a means for draining condensate, wherein the housing of the means for draining condensate is fixed to one of the piping components, and the piping component is provided with an opening that provides fluid connection to an inlet of the housing.

[0025] Condensate in the piping assembly enters the housing through openings and inlets, and moves upward to the outlet supported by the discharge element. For example, the openings can be orifices, slots, or an arrangement of orifices and / or slots.

[0026] Preferably, the exhaust system includes an exhaust treatment device, such as a catalytic converter and / or a particulate filter, and a rear muffler, with a device for draining condensate integrated downstream of the exhaust treatment device and / or upstream of the rear muffler in the exhaust system. Therefore, the device for draining condensate is preferably located in the middle region of the exhaust system, where condensate accumulation is particularly unfavorable.

[0027] The housing is particularly preferably fastened to a piping component located between the catalytic converter and the after-muffler. This prevents leakage of unpurified exhaust gas and avoids water accumulation near the catalytic converter.

[0028] Piping components can be pipes or silencer housings, such as the housing of an intermediate silencer.

[0029] The device for draining condensate is preferably fixed to the lower side of the piping component so that an independent discharge point can be set at the inlet.

[0030] Depending on the application requirements, the housing can be welded, screwed on, or clamped to the piping components using fixtures.

[0031] The exhaust system may have an intermediate muffler having an inner shell and an outer shell, with piping components formed by the inner shell of the intermediate muffler and the outer shell formed by the outer shell.

[0032] It can be specified that damping material is placed between the inner and outer shells, with an opening leading to a collection chamber formed by the gap created by the damping material. Therefore, when the absorption space is filled with damping material, a portion is intentionally cut off to create a receiving space for condensate. For example, the damping material can be specifically placed in the upper region of the intermediate muffler.

[0033] According to one specific embodiment of the invention, the opening is a slit extending transversely to the flow direction, formed by a cut in the inner shell and a wall portion of the inner shell that curves from the cut towards the outer shell. This simplifies manufacturing. The curved wall portion can also serve as a flow guide. If desired, two or more slits can be provided, arranged continuously relative to the flow direction.

[0034] At least two openings can be provided in the piping components to provide corresponding fluid connections to the housing inlet, with one opening located in the upstream region of the housing and the other in the downstream region. Therefore, for example, during braking, water carried by the exhaust gas flow and water sloshing in the opposite direction can be guided into the housing.

[0035] One of the openings, particularly the one located at the downstream end of the shell, is preferably located in the radially protruding region of the inner shell. This spoon-shaped opening is particularly suitable for collecting sloshing condensate.

[0036] One of the openings, particularly the one located at the upstream end of the shell, can be positioned downstream of the radially inward-facing ramp section of the inner shell. The ramp section ensures that airflow passes relatively smoothly over the opening, so that only condensate enters the shell under gravity. This counteracts unwanted noise generation.

[0037] According to another embodiment of the invention, a plug formed of porous material is inserted into the housing as a discharge element. Since the plug occupies only a relatively small area of ​​the housing, a relatively large collection chamber is created for collecting and temporarily storing condensate.

[0038] Further extensions of the invention can be seen from the following description and accompanying drawings.

[0039] The invention will now be described by way of example with reference to the accompanying drawings. Attached Figure Description

[0040] Figure 1 An exhaust system according to the invention is shown in a simplified form, which has means according to the invention for discharging condensate from the exhaust system; Figure 2 A first embodiment of the apparatus according to the invention for discharging condensate from an exhaust system is shown in cross-sectional view; Figure 3 A three-dimensional diagram is shown based on Figure 2 The basin-shaped base of the device; Figure 4 Showing according to Figure 3 The basin-shaped base, with the cover abutting against it from below; Figure 5 The following shows the data based on... Figure 3 The basin-shaped base has a fibrous discharge element; Figure 6 A second embodiment of the apparatus according to the invention for discharging condensate from an exhaust system is shown in cross-sectional view; Figure 7 A third embodiment of the apparatus according to the invention for discharging condensate from an exhaust system is shown in cross-sectional view; and Figure 8 A fourth embodiment of the apparatus according to the invention for discharging condensate from an exhaust system is shown in cross-sectional view. Detailed Implementation

[0041] Figure 1 The exhaust system 11, associated with the internal combustion engine of a motor vehicle, is shown only partially and schematically, and includes, in a commonly known manner, multiple piping components arranged for emitting exhaust gases, particularly a catalytic converter 13, a rear muffler 15 with an exhaust pipe 17, and multiple pipe fittings 18, 19, and 20. A particulate filter may be used as an alternative to or supplement to the catalytic converter 13. The various components of the exhaust system 11 are fastened to the vehicle chassis 21; however, this is not mandatory. It should be understood that the exhaust system 11 may have other piping components, such as additional catalytic converters, intermediate mufflers, and additional pipe fittings.

[0042] Condensate forms in the middle and rear regions of the exhaust system 11, particularly during short-distance operation and / or when the internal combustion engine is electrically assisted. The condensate is typically collected in a separate section at the base 23 of pipe fittings 18, 19, and 20. To prevent this accumulated water from sloshing around, a device 25 for draining the condensate is incorporated into the exhaust system 11. It includes a housing 27, which is fixed to pipe fitting 20 on the right side of the figure. This means that housing 27 is positioned downstream of the catalytic converter 13 and upstream of the rear muffler 15.

[0043] The housing 27 has an inlet 28 and an outlet 29. An opening 31 formed in the pipe fitting 20 is aligned with the inlet 28, allowing fluid communication between the interior of the pipe fitting 20 and the housing 27. The outlet 29 opens to the atmosphere. As shown, the opening 31 is located in the region of the base 23 of the pipe fitting 20, i.e., in the illustrated embodiment, the opening 31 faces away from the vehicle chassis 21. The housing 27 is preferably made of heat-resistant metal, particularly sheet metal, and is welded, screwed, and / or clamped to the pipe fitting 20 as required by the application.

[0044] like Figure 1 As shown, inlet 28 and outlet 29 are spaced 33 apart in the horizontal direction. The spacing relative to the respective portions, such as the center of inlet 28 and outlet 29, can be at least 5 cm and at most 50 cm.

[0045] like Figure 2 As shown in the magnified view, the discharge element 35, formed of porous material, is arranged between the inlet 28 and the outlet 29 of the housing 27.

[0046] exist Figure 2 In the illustrated embodiment, the housing 27 is designed as two parts. The basin-shaped base 37 of the housing 27 is... Figure 3The image is shown separately, in which a discharge element 35 is inserted. The discharge element 35 here comprises an arrangement of elongated capillary bodies 39 formed of a fibrous material (e.g., in the form of glass fiber rope). The base 37 is relatively flat and includes a basin bottom 41 and a one-sided basin opening 43. An inlet 28 is formed by a circular recess 45 in the basin bottom 41 from which a tube seat 47 extends.

[0047] like Figure 2 As shown, the basin-shaped base 37 is fixed to the base 23 of the pipe fitting 20. This arrangement is chosen such that the basin bottom 41 contacts the base 23 of the pipe fitting 20, and the pipe seat 47 protrudes into the opening 31. An annular sealing element extending around the pipe seat 47 can be provided, but... Figure 2 Not displayed.

[0048] Therefore, the bottom 41 of the basin forms the fastening flange 49 of the shell 27. The single-sided basin opening 43 is covered by the lid 51. Figure 4 As shown, the cover 51 is designed as a plate with two protrusions 53 and parallel ridges 55. In the assembled state of the housing 27, the ridges support the elongated capillary body 39 ( Figure 3 (To keep it in the correct position.) The parallel groove 57 provided in the cover 51 is arranged to form the outlet 29 of the housing 27. Alternatively, a grid-like perforation may be provided in the cover 51 as the outlet 29.

[0049] During operation of the exhaust system 11, condensate is collected at the base 23 of the pipe fitting 20. It moves into the housing 27 through the opening 31 and the inlet 28, where it is conveyed to the trough 57 by the capillary action of the discharge element 35, and then discharged out of the housing by gravity through the trough 57.

[0050] The labyrinthine design of the housing 27 and the presence of the discharge element 35 offset exhaust gas leakage and increased noise emissions. The discharge element 35 also provides a degree of flow restriction, allowing water to drain continuously from the tank 57 rather than in a splashing manner. The collection chamber 59 is formed by the protrusion 53 of the cover 51 and is capable of temporarily storing water. Tests have shown that using a device 25 of this type, more than 1 liter of water can be guided and transferred over 7 days.

[0051] Another embodiment of emission element 65 is, for example Figure 5 As shown. Instead of the arrangement of the elongated capillary body 39, a single flat capillary body 69 is provided here, for example, using aramid fiber fluff.

[0052] Figure 6 The diagram shows a method for using an exhaust system 11 according to the present invention. Figure 1Another embodiment of the device 75 for draining condensate from the pipe fitting 20. The housing 77 is integrally formed here. Specifically, the housing 77 is formed of a cup-shaped deep-drawn portion 79 having a one-sided cup opening 81 and a peripheral edge band 83. The edge band 83 is threaded or riveted to the base 23 of the pipe fitting 20, but may also be welded thereto. This means that in Figure 6 In the embodiment shown, the edge band 83 forms a fastening flange 49. The one-sided cup opening 81 forms an inlet 28.

[0053] The discharge element 85 is housed in a cup-shaped deep-drawn portion 79. The discharge element 85 includes a first lower capillary body 86 formed of fibrous material and a second upper capillary body 87 formed of sintered metal. Alternatively, a single capillary body formed of fibrous material or sintered metal may be used and housed in the cup-shaped deep-drawn portion 79.

[0054] According to Figure 2 The embodiments differ, depending on Figure 6 In this embodiment, the outlet 29 is not located at the bottom of the housing 77, but rather on the side. However, a collection chamber 59 is also formed.

[0055] According to an embodiment not shown, the discharge element is integrated into a plug, which can be screwed into a threaded bushing fastened to a pipe fitting. For this purpose, the internal thread of the threaded bushing matches the external thread of the plug. The outlet is preferably located at the end face of the plug. A particular advantage of this variant is that the system can be quickly and easily replaced.

[0056] Figure 7 Another embodiment of the device 95 for draining condensate from the exhaust system 11 according to the invention is shown. Here, the housing 97 includes a clamp or sleeve 98 that engages around the pipe fitting 20. The discharge element 65 is a strip of fiber placed around the pipe fitting 20. In this case, the fastening flange 49 is formed by the lower half of the sleeve 98.

[0057] Because of this invention, condensate can be discharged from the exhaust system independently of operation, such as Figure 2 , 6 As indicated by the arrows in Figure 7, water is specifically extracted from the middle region of the system, an area where water cannot typically be extracted via atomization.

[0058] Figure 8Another embodiment of the device 105 for draining condensate from an exhaust system 11 according to the present invention is shown. The device 105 is incorporated into an intermediate muffler 109 having an inner shell 110 and an outer shell 111. A piping component 20 is formed by the inner shell 110 of the intermediate muffler 109, while a housing 107 is formed by the outer shell 111. In the upper half of the intermediate muffler 109, a sound-absorbing damping material 113 is inserted between the inner shell 110 and the outer shell 111. In the lower half of the intermediate muffler 109, the space between the inner shell 110 and the outer shell 111 is free of damping material, thus forming a collection chamber 59 for collecting condensate.

[0059] exist Figure 8 In the illustrated embodiment, the piping component 20 has two openings 31 and 131, which are in fluid communication with the inlet 28 of the housing 107. As shown, one opening 31 is located in the upstream region of the housing 107, and the other opening 131 is located in the downstream region of the housing 107. Openings 31 and 131 are formed by corresponding slits extending transversely to the flow direction 117. Each slit is formed by a cut in the inner shell 110 and a wall portion 119 of the inner shell 110 that bends outward from the cut.

[0060] An opening 131 located at the downstream end of the housing 107 is positioned in the region of the radial protrusion 121 of the inner housing 110, thereby forming a spoon shape. This allows for the efficient collection of condensate sloshing along the flow direction 117 (i.e., along the travel direction 118), as indicated by the arrow.

[0061] An opening 31, located at the upstream end of the housing 107, is positioned downstream of the radially inwardly sloping portion 122 of the inner housing 110. The sloping portion 122 supports the smooth flow of exhaust gas through the opening 31, ensuring that only heavy condensate enters the collection chamber 59, as indicated by the arrow. This counteracts unwanted noise generation.

[0062] According to Figure 8 In one embodiment, a plug 125 made of porous material is inserted into the housing 111 as a discharge element via a bushing 135.

[0063] Condensate entering the collection chamber 59 may accumulate in large quantities before reaching the edge of the bushing 135 and being gradually discharged through the plug 125, as shown by the exemplary liquid level line 137.

[0064] Reference tag list: 11 Exhaust System 13 Catalytic converter 15 Rear Muffler 17. Exhaust pipe 18 Pipe fittings 19 Pipe fittings 20 Pipe fittings 21 Vehicle chassis 23 Pipe fitting base 25. Condensate drain device 27. Casing 28 Entrances 29 Exports 31 Opening 33. Spacing in the horizontal direction 35 Emission Components 37 Base 39 Slender capillary bodies 41. Bottom of the pot 43. Single-sided basin opening 45 recess 47 tube seat 49 Fastening flange 51 cover 53 Protrusions 55 ridges 57 slots 59 Collection Room 65 Emission Components 69 Flat capillary bodies 75 Condensate drain device 77. Housing 79 Cup-shaped deep-drawn portion 81 cups open 83 Edge Zone 85 emission elements 86 Lower capillary body 87 Upper capillary body 95 Condensate drain device 97. Shell 98 sleeve 105 Condensate drain device 107 Housing 109 Intermediate silencer 110 Inner Shell 111 Outer shell 113 Damping Materials 117 Flow direction 118 Direction of travel 119. Curved wall section 121 Radial protrusion 122 Slope Section 125 stopper 135 bushing 137 Liquid Level Line

Claims

1. A device (25, 75, 95) for draining condensate from an exhaust system (11), characterized in that, The device (25, 75, 95) includes: The housing (27, 77, 97) is for being fastened to the piping component (20) of the exhaust system (11) and has an inlet (28) in fluid communication with the piping component (20) and an outlet (29) to the atmosphere. The inlet (28) and the outlet (29) are arranged at intervals from each other, and the discharge element (35, 65, 85) formed of porous material is arranged between the inlet and the outlet in the housing (27, 77, 97).

2. The apparatus according to claim 1, Its features are, The housing (27, 77, 97) has a fastening flange (49) configured to rest against the outer wall of the lower part of the pipeline component (20), and the outlet (29) is formed inside or on the lower side of the housing, which is opposite to the fastening flange (49).

3. The apparatus according to claim 2, Its features are, The vertical axis of the housing (27, 77, 97) is defined by the relative arrangement of the fastening flange (49) and the lower side, and the distance between the inlet (28) and the outlet (29) has a component (33) in the horizontal direction relative to the vertical axis.

4. The apparatus according to claim 3, Its features are, The horizontal component (33) is at least 1 cm and at most 60 cm, preferably at least 5 cm and at most 30 cm.

5. The apparatus according to any one of claims 2 to 4, Its features are, The lower side of the housing (27, 77) has at least one protrusion (53), and in particular, the discharge element (35, 65, 85) does not extend into the protrusion (53).

6. The apparatus according to any one of the preceding claims, Its features are, The emission element (35, 65, 85) includes at least one capillary body (39, 69, 86) formed of fibrous material.

7. The apparatus according to any one of the preceding claims, Its features are, The emission element (85) includes at least one capillary body (87) formed of sintered metal.

8. The apparatus according to any one of the preceding claims, Its features are, The housing (27) includes a basin-shaped base (37) having a basin bottom (41) and a one-sided basin opening (43), the basin bottom (41) having a fastening flange (49), a recess (45) of the basin bottom (41) forming the inlet (28), the one-sided basin opening (43) being covered by a cover (51), and the outlet (29) being disposed on the cover.

9. The apparatus according to any one of claims 1 to 7, Its features are, The housing (77) includes a cup-shaped deep-drawn portion (79) having a one-sided cup opening (81) and a peripheral edge band (83), the one-sided cup opening (81) forming the inlet (28), the edge band (83) forming the fastening flange (49), and preferably the outlet (29) is disposed on the side wall of the cup-shaped deep-drawn portion (79).

10. The apparatus according to any one of claims 1 to 7, Its features are, The housing (97) includes a sleeve (98) that engages at least partially around the piping component.

11. The apparatus according to any one of the preceding claims, Its features are, The outlet (29) is arranged in the form of spaced-apart holes or slots (57).

12. The apparatus according to any one of the preceding claims, Its features are, The housing (27, 77, 97) is embossed with bumps and / or ridges (55) as positioning aids for the discharge elements (35, 65, 85).

13. An exhaust system (11) for a motor vehicle, characterized in that, The device includes a series of pipe components (13, 15, 17, 18, 19, 20) and a device (25, 75, 95, 105) for draining condensate from an exhaust system according to any one of the preceding claims, wherein a housing (27, 77, 97, 107) for draining condensate is fixed to one of the pipe components (20), in which an opening (31) is provided, the opening (31) being in fluid communication with an inlet (28) of the housing (27, 77, 97, 107).

14. The exhaust system according to claim 13, Its features are, The exhaust system (11) includes an exhaust treatment device (13), such as a catalytic converter or particulate filter, and a rear muffler (15), wherein the means (25, 75, 95, 105) for draining condensate are combined downstream of the exhaust treatment device and / or upstream of the rear muffler.

15. The exhaust system according to claim 13 or 14, Its features are, The housing (27, 77, 97, 107) is welded, screwed or clamped to the piping component (20).

16. The exhaust system according to any one of claims 13 to 15, Its features are, The exhaust system (11) has an intermediate muffler (109) having an inner shell (110) and an outer shell (111), wherein the piping component (20) is formed by the inner shell (110) of the intermediate muffler (109) and the outer shell (107) is formed by the outer shell (111).

17. The exhaust system according to claim 16, Its features are, A damping material (113) is arranged between the inner shell (110) and the outer shell (111), and the opening (31) leads to a collection chamber (59) through a gap in the damping material.

18. The exhaust system according to claim 16 or 17, Its features are, The opening (31) is a slit extending transversely to the flow direction (117) and is formed by a cut in the inner shell (110) and a wall portion (119) of the inner shell (110) that bends toward the outer shell (111) from the cut.

19. The exhaust system according to any one of claims 16 to 18, Its features are, The piping component (20) is provided with at least two openings (31, 131) that provide corresponding fluid connections to the inlet (28) of the housing (107), with one opening (31) located in the region at the upstream end of the housing (107) and the other opening (131) located in the region at the downstream end of the housing (107).

20. The exhaust system according to claim 19, Its features are, One of the at least two openings (31, 131), particularly the opening (131) located at the downstream end of the housing (107), is located in the region of the radial protrusion (121) of the inner housing (110).

21. The exhaust system according to claim 19 or 20, Its features are, One of the at least two openings (31, 131), particularly the opening (31) located at the upstream end of the housing (107), is located downstream of the radially inward ramp portion (122) of the inner housing (110).

22. The exhaust system according to any one of claims 16 to 21, Its features are, A plug (125) made of porous material is inserted into the housing (111) as a discharge element.

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