Thermally insulated interface assembly and exhaust gas aftertreatment device

Abstract

According to a first aspect, the application relates to a thermally insulated interface arrangement (1) for an exhaust gas aftertreatment device (6), comprising: - a first electrical interface (3.1); - an inner casing that encloses the first electrical interface (3.1); and - a thermal insulation casing that encloses the inner casing, wherein the thermal insulation casing comprises a ceramic material or is formed from a ceramic material. Alternatively, according to a second aspect, the application relates to a thermally insulated interface arrangement (1) for an exhaust gas aftertreatment device (6), comprising: - a first electrical interface (3.1); - a gap that encloses the first electrical interface (3.1), wherein the gap is formed by a gap between the first electrical interface (3.1) and an outer casing that encloses the gap; and - an intermediate element that is arranged at the first electrical interface (3.1).1), wherein the intermediate element (21) is adjacent to the gap and is encased by the outer casing (19). Furthermore, the invention relates to an exhaust gas aftertreatment device (6) with a thermally insulated interface arrangement (1) according to the first or second aspect.

Description

[0001] The invention relates to a thermally insulated interface arrangement for an exhaust gas aftertreatment device and to an exhaust gas aftertreatment device with such a thermally insulated interface arrangement.

[0002] It is known to equip motor vehicles, especially commercial vehicles, especially trucks, with an exhaust gas aftertreatment device to purify pollutants in combustion exhaust gases, in particular to convert harmful combustion exhaust gases into less harmful gases or to filter out particles. The purification of combustion exhaust gases can be achieved, for example, mechanically, catalytically, or chemically. The exhaust gas aftertreatment device can have an electric exhaust gas heating device to prepare, in particular heat, combustion exhaust gases for more efficient purification. This is particularly necessary to meet emissions standards, such as the EUR07 emissions standard. The electric exhaust gas heating device can have a heating output of up to 12 kW, which requires a current of 200 to 240 A – at an on-board voltage of approximately 48 V.The electrical interfaces used in this process can heat up to temperatures of up to 350°C. Due to ADR requirements arising from the European Agreement concerning the International Carriage of Dangerous Goods by Road (ADR) and TÜV regulations, electrical interfaces must be specially covered, protected, and insulated. Typically, the electrical interfaces are insulated using a silicone cable insulation jacket. Since silicones are only heat-resistant up to approximately 250°C, they can no longer be used in the exhaust gas heating systems required for the EURO 7 emissions standard.

[0003] The invention is therefore based on the object of creating a thermally insulated interface arrangement for an exhaust gas aftertreatment device and an exhaust gas aftertreatment device with such a thermally insulated interface arrangement, wherein the aforementioned disadvantages are reduced, preferably do not occur.

[0004] The object is achieved by providing the present technical teaching, in particular the teaching of the independent claims as well as the preferred embodiments disclosed in the dependent claims and the description.

[0005] The object is achieved in particular by providing a thermally insulated interface arrangement for an exhaust gas aftertreatment device according to a first aspect. The thermally insulated interface arrangement comprises a first electrical interface, an inner casing that surrounds the first electrical interface, and a thermal insulation casing that surrounds the inner casing. The thermal insulation casing comprises a ceramic material or is formed from a ceramic material.

[0006] Advantageously, the ceramic design of the thermal insulation jacket according to the first aspect results in the first electrical interface being particularly well thermally insulated while simultaneously requiring minimal installation space. If the temperature of the first electrical interface during operation of the exhaust gas heating device—when the thermally insulated interface arrangement is used as intended in an exhaust aftertreatment device of the exhaust gas heating device—is approximately 350°C, for example, this temperature can be less than 200°C due to the thermal insulation on an outer side of the thermal insulation jacket. Thus, it is advantageously possible to design the cable insulation jacket from silicone without the silicone decomposing during operation of the exhaust gas heating device and damaging the insulation of the first electrical interface.Furthermore, the ADR requirements and the TÜV regulations can be met, so that such an exhaust gas heating system can be used to meet exhaust gas standards, in particular the EURO7 exhaust gas standard.

[0007] The term "envelop"is understood in the context of the present technical teaching - according to the first aspect and the second aspect - in particular to enclose, in particular to include, in particular to border, in particular to envelop, in particular to sheath, in particular to encompass along a circumferential direction of an element to be sheathed. In particular, end faces of the sheathed element are free of the sheath, in particular open. In particular, the end faces are not sheathed, in particular not sheathed. In particular, this is to be understood as in the case of a cable in which the cable sheath sheaths the wire. In particular, the inner sheath encloses the first electrical interface, in particular encloses it, in particular encloses it, in particular envelops it, in particular envelops it. In particular, the thermal insulation sheath encloses the inner sheath, in particular encloses it, in particular envelops it, in particular envelops it, in particular.

[0008] In one embodiment, the first electrical interface comprises a plug connector or is designed as a plug connector. In particular, the first electrical interface comprises a plug socket or is designed as a plug socket. Alternatively, the first electrical interface comprises, in particular, a plug connector or is designed as a plug connector.

[0009] In one embodiment, the first electrical interface has a fastening area, in particular a thread, to which the inner sheath is fastened, in particular screwed.

[0010] In one embodiment, the ceramic material comprises a glass ceramic or is formed as a glass ceramic. In particular, the thermal insulation jacket is formed from a single piece of glass ceramic.

[0011] According to a further development of the invention, the thermal insulation jacket is frictionally connected to the inner jacket, in particular pressed, in particular pressed on. In particular, the glass ceramic is pressed onto the inner jacket. This advantageously eliminates the need for complex fastening of the thermal insulation jacket to the inner jacket.

[0012] According to a further development of the invention, it is provided that the thermally insulated interface arrangement comprises an outer jacket which encloses the thermal insulation jacket.

[0013] In particular, the outer jacket encloses the thermal insulation jacket, in particular encloses it, in particular surrounds it, in particular wraps it, in particular envelops it.

[0014] In one embodiment, the ceramic material is a magnesium oxide material. In particular, the magnesium oxide material is arranged in powder form between the outer shell and the inner shell, in particular pressed in.

[0015] In one embodiment, the inner shell, the thermal insulation shell, and / or the outer shell each have a central axis. In particular, at least two, in particular three, of the central axes are arranged concentrically with one another. In one embodiment, the inner shell, the thermal insulation shell, and / or the outer shell have a profile shape selected from a group consisting of: a polygon, a rectangle, a square, an ellipse, and a circle. In particular, the inner shell and the thermal insulation shell have the same profile shape. In particular, the outer shell additionally has the same profile shape.

[0016] In particular, the profile shape has a predetermined wall thickness, forming, for example, an elliptical ring or a circular ring. In particular, the profile shape is arranged transversely to the central axis. In particular, the profile shape is the shape that is notionally extruded along the central axis to form the inner shell, the thermal insulation shell, and / or the outer shell.

[0017] According to a further development of the invention, the outer jacket is frictionally connected to the thermal insulation jacket, in particular by compression, in particular by pressing. This advantageously eliminates the need for complex fastening of the outer jacket to the thermal insulation jacket.

[0018] According to a further development of the invention, the inner sheath and / or the outer sheath comprise a metallic material or are formed from a metallic material. In particular, the inner sheath can be manufactured particularly easily, and a thread can be formed on the inner sheath, with which the inner sheath is screwed to the first electrical interface. In particular, the outer sheath and an outer side of the outer sheath—for applying a cable insulation sheath—can be manufactured particularly easily.

[0019] The object is also achieved by providing a thermally insulated interface arrangement for an exhaust gas aftertreatment device according to a second aspect. The thermally insulated interface arrangement comprises a first electrical interface, a thermal insulation jacket, an outer jacket, and an intermediate element. The thermal insulation jacket encloses the first electrical interface. The thermal insulation jacket is formed by a gap between the first electrical interface and the outer jacket enclosing the thermal insulation jacket. The intermediate element is arranged on the first electrical interface, in particular fastened thereto, in particular pressed, in particular pressed on, in particular welded. The intermediate element adjoins the thermal insulation jacket and is encased by the outer jacket.In particular, the outer shell is fastened to the intermediate element, in particular pressed with the intermediate element, in particular pressed onto the intermediate element.

[0020] Advantageously, the design of the thermal insulation jacket with a gap according to the second aspect results in the first electrical interface being particularly well thermally insulated, while simultaneously requiring relatively little installation space. If the temperature of the first electrical interface during operation of the exhaust gas heating device - when the thermally insulated interface arrangement is used as intended in an exhaust aftertreatment device of the exhaust gas heating device - is approximately 350°C, for example, this temperature can be less than 200°C due to the thermal insulation on an outer side of the outer jacket. Thus, it is advantageously possible to design the cable insulation jacket from silicone without the silicone decomposing during operation of the exhaust gas heating device and damaging the insulation of the first electrical interface.Furthermore, the ADR requirements and the TÜV regulations can be met, so that such an exhaust gas heating system can be used to meet exhaust gas standards, in particular the EURO7 exhaust gas standard.

[0021] In one embodiment, the first electrical interface comprises a plug connector or is designed as a plug connector. In particular, the first electrical interface comprises a plug socket or is designed as a plug socket. Alternatively, the first electrical interface comprises, in particular, a plug connector or is designed as a plug connector.

[0022] In one embodiment, the intermediate element is welded to the first electrical interface by an energy beam, in particular a laser beam. In particular, the outer jacket is welded to the intermediate element by an energy beam, in particular a laser beam.

[0023] According to a further development of the invention, the intermediate element is ring-shaped. In particular, the intermediate element is formed as a single piece. Advantageously, the intermediate element can be pressed onto the first electrical interface particularly easily.

[0024] Alternatively, the intermediate element may comprise at least two partial intermediate elements, in particular four partial intermediate elements. Advantageously, the partial intermediate elements result in comparatively low heat conduction.

[0025] The object is also achieved by providing an exhaust gas aftertreatment device, in particular for a motor vehicle, in particular for a commercial vehicle. The exhaust gas aftertreatment device has an exhaust gas aftertreatment housing, an electrical feedthrough, and a thermally insulated interface arrangement according to the invention in accordance with the first or second aspect, or a thermally insulated interface arrangement according to one or more of the previously described embodiments in accordance with the first or second aspect. The exhaust gas aftertreatment housing has a wall, in particular an outer wall. The exhaust gas aftertreatment housing is designed and configured such that an exhaust gas can flow through the exhaust gas aftertreatment housing and, in particular, be conducted into the environment through an exhaust tailpipe.The electrical feedthrough is configured to guide a first electrical line of the exhaust gas aftertreatment device through the wall, in particular the outer wall, of the exhaust gas aftertreatment housing. The thermally insulated interface arrangement is arranged outside the exhaust gas aftertreatment housing on the first electrical line and is electrically connected to the first electrical line. In connection with the exhaust gas aftertreatment device, the advantages already explained in connection with the thermally insulated interface arrangement arise in particular.

[0026] According to a development of the invention, it is provided that the exhaust gas aftertreatment device comprises a second electrical line. The second electrical line has a second electrical interface and a line insulation jacket, in particular an electrical line insulation jacket. In particular, the line insulation jacket comprises a silicone or is formed from a silicone. The second electrical interface is connected to the first electrical interface, in particular electrically connected, in particular plugged into the first electrical interface. The line insulation jacket rests against an outer side of the thermal insulation jacket and / or the outer jacket, in particular in a fluid-tight manner, and is designed to cover, in particular to protect, in particular to seal, in particular to insulate, an electrical connection between the first electrical interface and the second electrical interface.Advantageously, silicone is a well-known and proven material for sealing and insulating electrical connections and is therefore readily available.

[0027] In one embodiment, the second electrical interface has a plug connector or is designed as a plug connector. If the first electrical interface has a plug socket or is designed as a plug socket, the second electrical interface in particular has a plug or is designed as a plug. If the first electrical interface has a plug or is designed as a plug, the second electrical interface in particular has a plug socket or is designed as a plug socket.

[0028] According to a further development of the invention, the exhaust gas aftertreatment device comprises an electric exhaust gas heating device. The electric exhaust gas heating device is arranged within the exhaust gas aftertreatment housing.

[0029] The electrical exhaust gas heating device is electrically connected to the first electrical interface via the first electrical line, in particular so that the exhaust gas heating device can be supplied with electrical energy via the first electrical interface.

[0030] In one embodiment, the electric exhaust gas heating device has a heating output of 8 kW to 12 kW, which in particular requires a current of 200 to 240 A.

[0031] In one embodiment, the electric exhaust gas heating device is configured to be heated to a temperature of 500°C to 800°C.

[0032] The invention is explained in more detail below with reference to the drawings, which show: Fig. 1 shows a schematic representation of a first exemplary embodiment of a thermally insulated interface arrangement according to the first aspect, Fig. 2 shows a schematic representation of a second exemplary embodiment of a thermally insulated interface arrangement according to the first aspect, Fig. 3 shows a schematic representation of a first exemplary embodiment of a thermally insulated interface arrangement according to the second aspect, Fig. 4 shows a schematic representation of a second exemplary embodiment of a thermally insulated interface arrangement according to the second aspect, Fig. 5 shows a schematic representation of an exhaust gas aftertreatment device with a thermally insulated interface arrangement according to Figure 2 .

[0033] Figure 1 shows a schematic representation of a first embodiment of a thermally insulated interface arrangement 1 according to the first aspect.

[0034] The thermally insulated interface assembly 1 is shown in a side view on the left and in a top view on the right.

[0035] The thermally insulated interface assembly 1 comprises a first electrical interface 3.1, an inner jacket 5 that encloses the first electrical interface 3.1, and a thermal insulation jacket 7 that encloses the inner jacket 5. The thermal insulation jacket 7 comprises a ceramic material or is formed from a ceramic material.

[0036] In this embodiment, the first electrical interface 3.1 has a fastening area 9, in particular a thread, to which the inner jacket 5 is fastened, in particular screwed.

[0037] In this exemplary embodiment, the ceramic material comprises a glass ceramic or is formed as a glass ceramic. In particular, the thermal insulation jacket 7 is formed from a single piece of glass ceramic.

[0038] In this exemplary embodiment, the thermal insulation jacket 7 is frictionally connected to the inner jacket 5, in particular by compression, in particular by pressing. In particular, the glass ceramic is pressed onto the inner jacket 5.

[0039] In this exemplary embodiment, the inner shell 5 and the thermal insulation shell 7 each have a central axis 11. In particular, the two central axes 11 are arranged concentrically to one another. The inner shell 5 and the thermal insulation shell 7 have a circular profile. In particular, the inner shell 5 and the thermal insulation shell 7 have the same profile shape.

[0040] In particular, the profile shape has a predetermined wall thickness—illustrated for the thermal insulation jacket 7 by means of a dimension 15—so that a circular ring 13 is formed. In particular, the profile shape is arranged transversely to the central axis 11. In particular, the profile shape is the shape that is notionally extruded along the central axis 11—illustrated by the arrow 17—to form the inner jacket 5 and the thermal insulation jacket 7.

[0041] In this embodiment, it is provided that the inner shell 5 comprises a metallic material or is formed from a metallic material.

[0042] Figure 2 shows a schematic representation of a second embodiment of a thermally insulated interface arrangement 1 according to the first aspect.

[0043] Identical and functionally equivalent elements are provided with the same reference symbols in all figures, so that reference is made to the preceding description in each case.

[0044] The thermally insulated interface assembly 1 is also shown on the left side in a side view and on the right side in a top view.

[0045] In this exemplary embodiment, the thermally insulated interface assembly 1 comprises an outer jacket 19 that encloses the thermal insulation jacket 7. In particular, the outer jacket 19 surrounds the thermal insulation jacket 7, in particular enclosing it, in particular encompassing it, in particular enveloping it.

[0046] In this exemplary embodiment, the ceramic material is a magnesium oxide material. In particular, the magnesium oxide material is arranged in powder form between the outer casing 19 and the inner casing 5, in particular pressed in.

[0047] In this exemplary embodiment, the inner shell 5, the thermal insulation shell 7, and the outer shell 19 each have a central axis 11. In particular, the three central axes 11 are arranged concentrically to one another. The inner shell 5, the thermal insulation shell 7, and the outer shell 19 also have a circular profile.

[0048] In this embodiment, it is provided that the outer jacket 19 is frictionally connected to the thermal insulation jacket 7, in particular pressed, in particular pressed on.

[0049] In this embodiment, it is provided that the inner shell 5 and / or the outer shell 19 comprises a metallic material or is formed from a metallic material.

[0050] Figure 3 shows a schematic representation of a first embodiment of a thermally insulated interface arrangement 1 according to the second aspect.

[0051] The thermally insulated interface assembly 1 is also shown on the left side in a side view and on the right side in a top view.

[0052] The thermally insulated interface arrangement 1 comprises a first electrical interface 3.1, a thermal insulation jacket 7, an outer jacket 19, and an intermediate element 21. The thermal insulation jacket 7 encloses the first electrical interface 3.1. The thermal insulation jacket 7 is formed by a gap 23 between the first electrical interface 3.1 and the outer jacket 19 enclosing the thermal insulation jacket 7. The intermediate element 21 is arranged on the first electrical interface 3.1, in particular fastened thereto, in particular pressed, in particular pressed on, in particular welded. The intermediate element 21 borders the thermal insulation jacket 7 and is encased by the outer jacket 19. In particular, the outer jacket 19 is fastened to the intermediate element 21, in particular pressed with the intermediate element 21, in particular pressed onto the intermediate element 21.

[0053] In this exemplary embodiment, the intermediate element 21 is annular. In particular, the intermediate element 21 is formed as a single piece.

[0054] Figure 4 shows a schematic representation of a second embodiment of a thermally insulated interface arrangement 1 according to the second aspect.

[0055] In this embodiment, compared to the embodiment in Figure 3 alternatively, the intermediate element 21 has four partial intermediate elements 25.

[0056] Figure 5 shows a schematic representation of an exhaust gas aftertreatment device 6 with a heat-insulated interface arrangement 1 according to the second embodiment of the second aspect of Figure 2 .

[0057] The exhaust gas aftertreatment device 6 further comprises an exhaust gas aftertreatment housing 4 and an electrical feedthrough 27. The exhaust gas aftertreatment housing 4 has a wall 2, in particular an outer wall. The exhaust gas aftertreatment housing 4 is designed and configured such that an exhaust gas—represented by the arrow 29—can flow through the exhaust gas aftertreatment housing 4 and, in particular, can be conducted into the environment through an exhaust tailpipe (not shown). The electrical feedthrough 27 is configured to guide a first electrical line 31.1 of the exhaust gas aftertreatment device 6 through the wall 2, in particular the outer wall, of the exhaust gas aftertreatment housing 4. The thermally insulated interface arrangement 1 is arranged outside the exhaust gas aftertreatment housing 4 on the first electrical line 31.1 and is electrically connected to the first electrical line 31.1.

[0058] In this exemplary embodiment, it is provided that the exhaust gas aftertreatment device 6 comprises a second electrical line 31.2. The second electrical line 31.2 has a second electrical interface 3.2 and a line insulation sheath 33, which is only shown in a very simplified manner, in particular an electrical line insulation sheath 33. In particular, the line insulation sheath 33 comprises a silicone or is formed from a silicone. The second electrical interface 3.2 is connected to the first electrical interface 3.1, in particular electrically connected, in particular plugged into the first electrical interface 3.1. The line insulation sheath 33 rests against an outer side 35 of the outer sheath 19, in particular in a fluid-tight manner, and is designed to provide an electrical connection between the first electrical interface 3.1 and the second electrical interface 3.2 to cover, in particular to protect, in particular to seal, in particular to insulate.

[0059] In this exemplary embodiment, the exhaust gas aftertreatment device 6 comprises an electric exhaust gas heating device 37. The electric exhaust gas heating device 37 is arranged within the exhaust gas aftertreatment housing 4. The electric exhaust gas heating device 37 is electrically connected to the first electrical interface 3.1 via the first electrical line 31.1, in particular so that the exhaust gas heating device 37 can be supplied with electrical energy via the first electrical interface 3.1.

Claims

1. A thermally insulated interface arrangement (1) for an exhaust gas aftertreatment device (6), comprising: - a first electrical interface (3.1); - an inner casing (5) which surrounds the first electrical interface (3.1); and - a thermal insulation casing (7) which surrounds the inner casing (5), wherein the thermal insulation casing (7) comprises a ceramic material or is formed from a ceramic material.

2. Thermally insulated interface arrangement (1) according to claim 1, wherein - the thermal insulation jacket (7) is frictionally connected to the inner jacket (5).

3. Thermally insulated interface arrangement (1) according to one of the preceding claims, comprising: - an outer jacket (19) which encloses the thermal insulation jacket (7).

4. Thermally insulated interface arrangement (1) according to claim 3, wherein - the outer jacket (19) is frictionally connected to the thermal insulation jacket (7).

5. Thermally insulated interface arrangement (1) according to one of the preceding claims, wherein the inner jacket (5) and / or the outer jacket (19) comprises a metallic material or is formed from a metallic material.

6. A thermally insulated interface arrangement (1) for an exhaust gas aftertreatment device (6), comprising: - a first electrical interface (3.1); - a thermal insulation jacket (7) which encloses the first electrical interface (3.1), wherein the thermal insulation jacket (7) is formed by a gap (23) between the first electrical interface (3.1) and an outer jacket (19) enclosing the thermal insulation jacket (7); and - an intermediate element (21) which is arranged at the first electrical interface (3.1), wherein the intermediate element (21) adjoins the thermal insulation jacket (7) and is encased by the outer jacket (19).

7. Thermally insulated interface arrangement (1) according to claim 6, wherein - the intermediate element (21) is annular, or - the intermediate element (21) has at least two partial intermediate elements (25).

8. An exhaust gas aftertreatment device (6), comprising: - an exhaust gas aftertreatment housing (4) having a wall (2), wherein the exhaust gas aftertreatment housing (4) is designed and configured such that an exhaust gas can flow through the exhaust gas aftertreatment housing (4); - an electrical feedthrough (27) configured to guide a first electrical line (31.1) of the exhaust gas aftertreatment device (6) through the wall (2) of the exhaust gas aftertreatment housing (4); and - a thermally insulated interface arrangement (1) according to one of the preceding claims, which is arranged outside the exhaust gas aftertreatment housing (4) on the first electrical line (31.1) and is electrically conductively connected to the first electrical line (31.1).

9. Exhaust gas aftertreatment device (6) according to claim 8, comprising: - a second electrical line (31.2) which has a second electrical interface (3.2) and a line insulation jacket (33), wherein - the second electrical interface (3.2) is connected to the first electrical interface (3.1), wherein - the line insulation jacket (33) rests on an outer side (35) of the thermal insulation jacket (7) and / or the outer jacket (19) and is designed to cover an electrical connection between the first electrical interface (3.1) and the second electrical interface (3.2).

10. Exhaust gas aftertreatment device (6) according to claim 8 or 9, comprising: - an electrical exhaust gas heating device (37) which is arranged within the exhaust gas aftertreatment housing (4), wherein - the electrical exhaust gas heating device (37) is electrically connected to the first electrical interface (3.1) via the first electrical line (31.1).

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