Electric heater and tail gas aftertreatment device

Abstract

An electric heater comprises a shell, a heating belt assembly, a first connecting block, a first electrode assembly and a second electrode assembly. The shell comprises an installation space and a first installation hole. The heating band assembly is at least partially located in the installation space. The first connecting block is connected with the heating belt assembly, and the first connecting block is provided with a first fixing hole. The first electrode assembly includes a first electrode. The first electrode is provided with a first fixing part. The first fixing part penetrates through the first mounting hole and is connected with the first fixing hole in a threaded fit mode. The second electrode assembly comprises a second electrode, and the second electrode is directly or indirectly connected with the heating belt assembly. By means of the arrangement, the structure reliability problem possibly caused by direct welding of the first electrode and the heating belt assembly is avoided, and durability is improved. The utility model further discloses a tail gas after-treatment device comprising the electric heater.

Description

Background Art

[0002] The exhaust gas aftertreatment device in the related art generally includes at least one exhaust gas aftertreatment component. The exhaust gas aftertreatment component includes a shell and an exhaust gas aftertreatment carrier encapsulated in the shell. The exhaust gas aftertreatment carrier has an operating temperature range, that is, only when the temperature reaches the operating temperature range, the exhaust gas aftertreatment carrier has the best working efficiency.

[0003] With the continuous upgrading of emission regulations, higher and higher requirements are put forward for exhaust gas after-treatment devices, especially when the engine is cold started, the exhaust gas temperature is low and cannot reach the working temperature of the exhaust gas after-treatment carrier. At this time, the exhaust gas after-treatment carrier does not work or its conversion efficiency is extremely low, which is easy to cause emission pollution and other problems.

[0004] Therefore, how to shorten the time to reach the working temperature of the exhaust gas aftertreatment carrier as much as possible is a technical problem faced by technicians in the relevant technical field.

[0005] An electric heater is a device that uses electrical energy to heat exhaust gas, thereby shortening the time it takes to reach the operating temperature of the exhaust gas aftertreatment carrier. It is one of the important technical means in the industry.

[0006] An electric heater generally comprises a housing, a heating element and electrodes, wherein the electrodes are generally connected to the heating element by welding. This connection method still has room for improvement. Utility Model Content

[0007] The utility model aims to provide an electric heater and an exhaust gas post-processing device with high reliability.

[0008] To achieve the above object, the utility model adopts the following technical solution: an electric heater configured to be used in an exhaust gas post-treatment device, the electric heater comprising:

[0009] A housing, the housing comprising an installation space, an outer surface, an inner surface opposite to the outer surface, and a first installation hole penetrating the outer surface and the inner surface and communicating with the installation space;

[0010] a heating tape assembly, the heating tape assembly being at least partially located in the mounting space;

[0011] A first connecting block, the first connecting block is connected to the heating belt assembly, and the first connecting block is provided with a first fixing hole;

[0012] A first electrode assembly, the first electrode assembly comprising a first electrode, the first electrode being provided with a first fixing portion, the first fixing portion passing through the first mounting hole and being connected to the first fixing hole by threaded engagement;

[0013] a second electrode assembly, the second electrode assembly comprising a second electrode, the second electrode being directly or indirectly connected to the heating belt assembly;

[0014] One of the first electrode and the second electrode is a positive electrode, and the other is a negative electrode.

[0015] As a further improved technical solution of the utility model, the first fixing hole is provided with an internal thread, the first fixing portion is provided with an external thread, and the internal thread and the external thread match each other.

[0016] As a further improved technical solution of the utility model, the first electrode assembly further includes a first insulating portion disposed on the first electrode;

[0017] The first electrode includes a first main body portion, the first fixing portion is connected to the first main body portion, and the first insulating portion at least partially covers the first main body portion.

[0018] As a further improved technical solution of the present invention, the first main body portion and the first fixing portion are both cylindrical, wherein the outer diameter of the first fixing portion is smaller than the outer diameter of the first main body portion.

[0019] As a further improved technical solution of the present invention, the first insulating part is a ceramic sleeve, and the ceramic sleeve is sleeved on the first main body part to at least partially cover the first main body part.

[0020] As a further improved technical solution of the present invention, the first insulating part is an insulating coating plated on the first main body part.

[0021] As a further improved technical solution of the utility model, the first electrode also includes a first transition portion connected to the first main body portion and a first external threaded portion connected to the first transition portion, and the first external threaded portion, the first transition portion, the first main body portion and the first fixing portion are connected in sequence.

[0022] As a further improved technical solution of the utility model, the first transition portion is truncated cone-shaped and has a gradually changing outer diameter, and the first transition portion includes a large diameter end connected to the first main body portion and a small diameter end connected to the first external thread portion.

[0023] As a further improved technical solution of the utility model, the first electrode assembly also includes a first shielding portion fixed to the first insulating portion, and the first shielding portion is fixed to the outer surface of the shell to shield the first mounting hole.

[0024] As a further improved technical solution of the utility model, the first shielding portion is provided with a first through-hole, and the first insulating portion is fixed in the first through-hole in an interference fit manner.

[0025] As a further improved technical solution of the utility model, a first clearance hole is further provided inside the first shielding part, one end of the first insulating part extends out of the first shielding part, and the other end of the first insulating part passes through the first through hole and is at least partially located in the first clearance hole.

[0026] As a further improved technical solution of the present invention, the first shielding portion is welded and fixed to the outer surface of the shell.

[0027] As a further improved technical solution of the utility model, the first mounting hole is larger than the outer diameter of the first electrode assembly at the position corresponding to the first mounting hole, so that the first electrode assembly can be easily passed through the first mounting hole.

[0028] As a further improved technical solution of the utility model, the heating belt assembly includes a plurality of layers of heating belts, the plurality of layers of heating belts are stacked and wound to form a disc, and each layer of the heating belt includes a wave portion and a first extension portion connected to one end of the wave portion;

[0029] The first connecting block includes a first mounting groove, and the first extending portion is received in the first mounting groove.

[0030] As a further improved technical solution of the utility model, each first extension portion is in the shape of a straight strip, and the first extension portions of the plurality of layers of heating belts are parallel to each other;

[0031] The first installation grooves of the first connecting block are multiple and parallel to each other;

[0032] The first extension portion is received in the corresponding first installation slot.

[0033] As a further improved technical solution of the utility model, the first extension parts of the plurality of layers of heating belts are arranged at equal intervals; and the first installation grooves of the first connecting blocks are arranged at equal intervals.

[0034] As a further improved technical solution of the utility model, the first connecting block includes a first side surface, a second side surface opposite to the first side surface, and a first end surface;

[0035] The first mounting groove penetrates the first end surface, and the first mounting groove penetrates the first side surface and the second side surface along the axial direction of the electric heater.

[0036] As a further improved technical solution of the utility model, the first connecting block is made of metal material, and the first connecting block includes a first mounting portion, a first connecting portion connected to the first mounting portion, and a first clearance space located inside the first mounting portion;

[0037] The first mounting portion includes a first surface and a second surface opposite to the first surface. The first fixing hole is provided in the first mounting portion. The first fixing hole passes through the first surface and the second surface and is communicated with the first clearance space.

[0038] As a further improved technical solution of the utility model, after the first fixing portion passes through the first fixing hole, at least a portion of the first fixing portion protrudes into the first clearance space.

[0039] As a further improved technical solution of the utility model, the electric heater also includes a support frame at least partially located in the installation space and a pin assembly that fixes the heating belt assembly to the support frame along the axial direction of the electric heater, and the support frame is fixed to the inner surface of the shell.

[0040] As a further improved technical solution of the utility model, the support frame includes an inner edge, an outer edge, and a plurality of spokes connecting the inner edge and the outer edge; the outer edge is located on a circular contour line; the outer edge is provided with a first notch and a second notch, wherein the first notch corresponds to the first electrode assembly, and the second notch corresponds to the second electrode assembly.

[0041] As a further improved technical solution of the utility model, the pin assembly includes a pin, a first ceramic sleeve, a second ceramic sleeve and an end cap;

[0042] The insertion pin includes an abutment portion and an insertion pin portion connected to the abutment portion;

[0043] The first ceramic sleeve comprises a first base and a first cylindrical portion connected to the first base, the first base is provided with a first plug hole, and the first cylindrical portion is provided with a channel connected to the first plug hole;

[0044] The second ceramic sleeve includes a second socket;

[0045] The end cap is provided with a mounting socket;

[0046] The pin is inserted into the channel of the first ceramic sleeve from the first socket of the first ceramic sleeve, the pin passes through the channel and is inserted into the second socket, and the pin passes through the second socket and is inserted into the installation socket.

[0047] As a further improved technical solution of the utility model, the heating belt assembly includes a gap hole, the first cylindrical portion is inserted into the gap hole, the first base of the first ceramic sleeve and the second ceramic sleeve are respectively located on both sides of the heating belt assembly, and the support frame is provided with an installation through hole, and the pin passes through the installation through hole after passing through the second socket and before being inserted into the installation socket.

[0048] As a further improved technical solution of the utility model, the end cap is located on one side of the support frame, and the end cap is heated and melted to fill the installation through hole.

[0049] As a further improved technical solution of the utility model, the installation through hole is a waist-shaped hole, and the size of the waist-shaped hole is larger than the outer diameter of the pin.

[0050] As a further improved technical solution of the utility model, the housing includes a second mounting hole that penetrates the outer surface and the inner surface and is connected to the mounting space;

[0051] The electric heater further comprises a second connecting block, the second connecting block is connected to the heating belt assembly, and the second connecting block is provided with a second fixing hole;

[0052] The second electrode assembly includes a second electrode, and the second electrode is provided with a second fixing portion, and the second fixing portion passes through the second mounting hole and is connected to the second fixing hole by threaded engagement.

[0053] As a further improved technical solution of the present invention, the first connecting block has the same structure as the second connecting block; the first electrode assembly has the same structure as the second electrode assembly.

[0054] The utility model also discloses an exhaust gas post-treatment device, which comprises:

[0055] Air intake assembly;

[0056] an electric heater located downstream of the air intake assembly along the air flow direction;

[0057] a first exhaust gas after-treatment module located downstream of the electric heater along the airflow direction;

[0058] a second exhaust gas after-treatment module located downstream of the first exhaust gas after-treatment module along the airflow direction;

[0059] a mixer assembly located downstream of the second exhaust gas after-treatment module along the airflow direction;

[0060] a third exhaust gas after-treatment module located downstream of the mixer assembly along the air flow direction; and

[0061] an air outlet component located downstream of the third exhaust gas after-treatment module along the airflow direction;

[0062] Wherein, the electric heater is the aforementioned electric heater.

[0063] Compared with the prior art, the electric heater of the utility model includes a first connecting block, which is provided with a first fixing hole; the first electrode assembly includes a first electrode, which is provided with a first fixing portion, and the first fixing portion is connected to the first fixing hole by threaded cooperation; such an arrangement avoids the structural reliability problems that may be caused by direct welding of the first electrode and the heating belt assembly, and improves durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 It is a schematic diagram of the principle of the exhaust gas after-treatment device of the utility model.

[0065] Figure 2 It is a three-dimensional schematic diagram of the electric heater of the utility model in one embodiment.

[0066] Figure 3 yes Figure 2 A three-dimensional diagram from another angle.

[0067] Figure 4 yes Figure 2 main view.

[0068] Figure 5 yes Figure 3 main view.

[0069] Figure 6 yes Figure 4 A partial enlarged view of the middle frame portion A.

[0070] Figure 7 yes Figure 4 A partial enlarged view of the middle frame portion B.

[0071] Figure 8 yes Figure 2 Left view of .

[0072] Fig. 9 is along Figure 8 Schematic diagram of the cross section along the CC line.

[0073] Fig.10 yes Figure 2 A partially exploded perspective view of the present invention, wherein the first electrode assembly and the second electrode assembly are separated.

[0074] Fig.11 yes Fig.10 Partial three-dimensional exploded view from another angle.

[0075] Fig.12 yes Fig.10 A further partial exploded perspective view, wherein the first electrode assembly and the second electrode assembly are further exploded.

[0076] Fig.13 yes Fig.12 Partial three-dimensional exploded view from another angle.

[0077] Fig.14 yes Fig.12 A further partial exploded perspective view, in which the housing is further exploded.

[0078] Fig.15 yes Fig.14 Partial three-dimensional exploded view from another angle.

[0079] Fig.16 yes Fig.14 Exploded view of progress.

[0080] Fig.17 yes Fig.16 Exploded three-dimensional image from another angle.

[0081] Fig.18 yes Fig.16 A three-dimensional schematic diagram of a pin assembly.

[0082] Fig.19 yes Fig.18 3D exploded view of .

[0083] Fig. 20 yes Fig.18 A three-dimensional diagram from another angle.

[0084] Fig.21 yes Fig. 20 3D exploded view of .

[0085] Fig. 22 It is a three-dimensional exploded view of the first connecting block, the second connecting block, the heating belt assembly, the first electrode assembly and the second electrode assembly.

[0086] Fig.23 yes Fig. 22 main view.

[0087] Fig.24 yes Fig. 22 Exploded three-dimensional image from another angle.

[0088] Fig.25 yes Fig.24 main view.

[0089] Fig.26 yes Fig.23 A partial enlarged view of the circled portion D.

[0090] Fig. 27 yes Fig.23 A partial enlarged view of the circled portion E.

[0091] Fig.28 is along Figure 4 Schematic diagram of the cross section of the FF line. DETAILED DESCRIPTION

[0092] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. If there are several specific embodiments, the features of these embodiments can be combined with each other without conflict. When the description involves the drawings, unless otherwise specified, the same numbers or symbols in different drawings represent the same or similar elements. The contents described in the following exemplary embodiments do not represent all embodiments of the present invention. On the contrary, they are only examples of products consistent with the present invention as recorded in the claims of the present invention.

[0093] The terms used in the present invention are only for the purpose of describing specific implementations and are not intended to limit the scope of protection of the present invention. It should be understood that the terms such as "first", "second" and similar terms used in the specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish the names of features.

[0094] Please refer to Figure 1 As shown, the utility model discloses an exhaust gas after-treatment device, which includes an air intake component 200, an electric heater 100 located downstream of the air intake component 200 along the air flow direction, a first exhaust gas after-treatment module 300 (for example, a diesel oxidation catalyst, DOC) located downstream of the electric heater 200 along the air flow direction, a second exhaust gas after-treatment module 400 (for example, a diesel particulate filter, DPF) located downstream of the first exhaust gas after-treatment module 300 along the air flow direction, a mixer component 500 located downstream of the second exhaust gas after-treatment module 400 along the air flow direction, a urea nozzle 600 installed on the mixer component 500, a third exhaust gas after-treatment module 700 (for example, a selective catalytic reduction, SCR) located downstream of the mixer component 500 along the air flow direction, and an exhaust component 800 located downstream of the third exhaust gas after-treatment module 700 along the air flow direction. The first exhaust gas post-processing module 300, the second exhaust gas post-processing module 400 and the third exhaust gas post-processing module 700 are collectively referred to as exhaust gas post-processing modules. Figure 1 As shown, the airflow direction is Figure 1 The hollow arrow points to the direction.

[0095] Please combine Figures 2 to 28As shown, the embodiment of the utility model illustrated in the figure discloses an electric heater 100, which is used in the exhaust gas after-treatment device, and the electric heater 100 includes a shell 1, a heating belt assembly 2 at least partially located in the shell 1, a first electrode assembly 3 installed on the shell 1, a second electrode assembly 4 installed on the shell 1, a first connecting block 5 connecting one end of the heating belt assembly 2 with the first electrode assembly 3, a second connecting block 6 connecting the other end of the heating belt assembly 2 with the second electrode assembly 4, a support frame 7 at least partially located in the shell 1, and a plurality of pin assemblies 8 fixing the heating belt assembly 2 to the support frame 7 along the axial direction of the electric heater 100.

[0096] In the illustrated embodiment of the present utility model, the shell 1 is made of a metal material, for example, a stainless steel material. The shell 1 is roughly in the shape of a hollow cylinder, and the shell 1 is provided with an installation space 10. The shell 1 includes an outer surface 11 and an inner surface 12 opposite to the outer surface 11, and the inner surface 12 is exposed to the installation space 10. The shell 1 also includes a first installation hole 13 that passes through the outer surface 11 and the inner surface 12 and is connected to the installation space 10, and a second installation hole 14 that passes through the outer surface 11 and the inner surface 12 and is connected to the installation space 10. In the illustrated embodiment of the present utility model, the first installation hole 13 and the second installation hole 14 are both circular through holes. Of course, those skilled in the art can understand that in other embodiments of the present utility model, the first installation hole 13 and the second installation hole 14 can also be other shapes, including but not limited to elliptical holes, waist-shaped holes, rectangular holes, trapezoidal holes, triangular holes, etc., and the present utility model will not repeat them. In addition, in the embodiment of the utility model shown in the figure, the outer surface 11 and the inner surface 12 are both arc-shaped surfaces. Of course, those skilled in the art will understand that in other embodiments of the utility model, the outer surface 11 and the inner surface 12 may also be planes.

[0097] In the illustrated embodiment of the utility model, the heating belt assembly 2 includes several layers of heating belts 21 made of metal material. In the illustrated embodiment of the utility model, the heating belt assembly 2 includes seven layers of heating belts 21, wherein each layer of the heating belt 21 includes a wave portion 210, a first extension portion 211 connected to one end of the wave portion 210, and a second extension portion 212 connected to the other end of the wave portion 210. The wave portion 210 is generally wavy, and is provided with crests and troughs. The heating belts 21 of two adjacent layers are fixed together. In one embodiment of the utility model, the heating belts 21 of two adjacent layers are fixed together by brazing. It can be understood by those skilled in the art that the two adjacent layers of the heating belts 21 can be fixed together in various ways, for example, the crest of one heating belt 21 is fixed to the crest of an adjacent heating belt 21; or the crest of one heating belt 21 is fixed to the trough of an adjacent heating belt 21; or the trough of one heating belt 21 is fixed to the trough of an adjacent heating belt 21. The heating belt assembly 2 includes a plurality of gap holes 22 between two adjacent layers of heating belts 21. Most of the plurality of gap holes 22 are used to allow exhaust gas to flow through, so that the heating belt assembly 2 is used to heat the exhaust gas.

[0098] Those skilled in the art will appreciate that the crests of each layer of the heating belt 21 may be the same or different, and the troughs of each layer of the heating belt 21 may be the same or different. The crests of two adjacent layers of the heating belt 21 may be the same or different, and the troughs of two adjacent layers of the heating belt 21 may be the same or different.

[0099] In the embodiment shown in the figure of the utility model, the plurality of layers of heating belts 21 are stacked and wound to form a disc. The heating belt assembly 2 includes a plurality of layers from the inside to the outside in the radial direction, wherein a gap 23 is provided between the inner layer of the heating belt assembly 2 and the outer layer of the heating belt assembly 2. The gap 23 is used to allow the exhaust gas to flow through, so that the exhaust gas is heated by the heating belt assembly 2.

[0100] In the illustrated embodiment of the utility model, preferably, the length of each layer of the heating belt 21 is the same, so as to evenly distribute the current to each heating belt 21 as much as possible. In the illustrated embodiment of the utility model, the first extension portion 211 and the second extension portion 212 are both roughly in the shape of straight strips. It can be understood by those skilled in the art that the technology used in the utility model belongs to the "straight strip" and does not require it to be completely flat and completely straight, and appropriate bending is also possible. In one embodiment of the utility model, the first extension portion 211 and the second extension portion 212 can even be arranged obliquely relative to the wave portion 210. In the illustrated embodiment of the utility model, the plurality of layers of heating belts 21 include a first end 24 composed of the plurality of first extension portions 211 and a second end 25 composed of the plurality of second extension portions 212. In the illustrated embodiment of the utility model, the plurality of first extension portions 211 of the first end 24 are parallel to each other, and the plurality of second extension portions 212 of the second end 25 are also parallel to each other.

[0101] Preferably, in an embodiment of the present invention, the distance between any two adjacent first extension portions 211 of the plurality of first extension portions 211 is equal, in other words, the plurality of first extension portions 211 are arranged at equal intervals. Compared with the design in which the plurality of first extension portions 211 are stacked and squeezed together, this arrangement is less likely to cause heat concentration after power is turned on, thereby reducing the risk of excessive local temperature.

[0102] Similarly, in one embodiment of the present invention, the distance between any two adjacent second extensions 212 is equal among the plurality of second extensions 212. In other words, the plurality of second extensions 212 are arranged at equal intervals. Compared with the design in which the plurality of second extensions 212 are stacked and squeezed together, this arrangement is less likely to cause heat concentration after power is turned on, thereby reducing the risk of excessive local temperature.

[0103] The first connection block 5 is made of metal material, and includes a first mounting portion 51, a first connecting portion 52 connected to the first mounting portion 51, and a first clearance space 53 located on the inner side of the first mounting portion 51. The first mounting portion 51 includes a first surface 511 (e.g., an upper surface), a second surface 512 (e.g., a lower surface) opposite to the first surface 511, and a first fixing hole 513 that passes through the first surface 511 and the second surface 512 and is connected to the first clearance space 53. In one embodiment of the utility model, the first fixing hole 513 is an internal threaded hole. The first fixing hole 513 corresponds to the first mounting hole 13. In the illustrated embodiment of the utility model, the size of the first mounting hole 13 is larger than the size of the first fixing hole 513, so as to facilitate the first electrode assembly 3 to pass through the first mounting hole 13 during assembly.

[0104] The first connecting portion 52 includes a first side surface 521, a second side surface 522 opposite to the first side surface 521, a first end surface 523, and a plurality of first mounting grooves 524 penetrating the first end surface 523. In the illustrated embodiment of the utility model, the first mounting groove 524 penetrates the first side surface 521 and the second side surface 522 along the axial direction of the electric heater 100. The first mounting groove 524 is used to accommodate the first extension portion 211. In order to improve the elasticity of the installation, the length of the first mounting groove 524 is greater than the length of the first extension portion 211. The design of accommodating the first extension portion 211 in the first mounting groove 524 is conducive to increasing the contact area between the first extension portion 211 and the first connecting block 5, and is conducive to improving the connection stability between the two.

[0105] Similarly, the second connection block 6 is made of a metal material, and includes a second mounting portion 61, a second connecting portion 62 connected to the second mounting portion 61, and a second clearance space 63 located on the inner side of the second mounting portion 61. The second mounting portion 61 includes a third surface 611 (e.g., an outer surface), a fourth surface 612 (e.g., an inner surface) opposite to the third surface 611, and a second fixing hole 613 that passes through the third surface 611 and the fourth surface 612 and is connected to the second clearance space 63. In one embodiment of the utility model, the second fixing hole 613 is an internal threaded hole. The second fixing hole 613 corresponds to the second mounting hole 14. In the illustrated embodiment of the utility model, the size of the second mounting hole 14 is larger than the size of the second fixing hole 613, so as to facilitate the second electrode assembly 4 to pass through the second mounting hole 14 during assembly.

[0106] The second connecting portion 62 includes a third side surface 621, a fourth side surface 622 opposite to the third side surface 621, a second end surface 623, and a plurality of second mounting grooves 624 penetrating the second end surface 623. In the illustrated embodiment of the utility model, the second mounting groove 624 penetrates the third side surface 621 and the fourth side surface 622 along the axial direction of the electric heater 100. The second mounting groove 624 is used to accommodate the second extension portion 212. In order to improve the elasticity of the installation, the length of the second mounting groove 624 is greater than the length of the second extension portion 212. The design of accommodating the second extension portion 212 in the second mounting groove 624 is conducive to increasing the contact area between the second extension portion 212 and the second connecting block 6, and is conducive to improving the connection stability between the two.

[0107] The first electrode assembly 3 includes a first electrode 31, a first insulating portion 32 disposed on the first electrode 31, and a first shielding portion 33 fixed to the first insulating portion 32. In one embodiment of the utility model, the first electrode 31 includes a first main body 311, a first transition portion 312 connected to one end of the first main body 311, a first fixing portion 313 connected to the other end of the first main body 311, and a first external threaded portion 314 connected to the first transition portion 312. In the embodiment illustrated in the utility model, the first external threaded portion 314, the first transition portion 312, the first main body 311, and the first fixing portion 313 are connected in sequence. In the embodiment illustrated in the utility model, the outer diameter of the first main body 311 is greater than the outer diameter of the first external threaded portion 314. The first transition portion 312 is truncated cone-shaped, which includes a large diameter end connected to the first main body 311 and a small diameter end connected to the first external threaded portion 314, so that the first main body 311, the first transition portion 312, and the first external threaded portion 314 change gradually. An outer diameter of the first fixing portion 313 is smaller than an outer diameter of the first main body portion 311 .

[0108] In the illustrated embodiment of the present invention, the first insulating portion 32 is a ceramic sleeve, which is sleeved on the first main body 311 to insulate the first electrode 31 from the first shielding portion 33. The first shielding portion 33 is provided with a first through hole 330, and the first insulating portion 32 is fixed in the first through hole 330 in an interference fit manner.

[0109] Of course, those skilled in the art will understand that the first insulating portion 32 is also an insulating coating (such as a ceramic coating) plated on the first main body portion 311 , which can also play an insulating role, and the present invention will not elaborate on this.

[0110] In the illustrated embodiment of the present invention, the first shielding portion 33 is welded and fixed to the outer surface 11 of the housing 1, and the first shielding portion 33 shields the first mounting hole 13. In addition, in order to prevent the heat generated during welding from damaging the first electrode 31 and / or the first insulating portion 32, a first clearance hole 331 is further provided inside the first shielding portion 33 to reduce heat transfer through air as quickly as possible. In the illustrated embodiment of the present invention, the first clearance hole 331 is generally conical, and the diameter of the hole at one end of the radial direction close to the heating belt assembly 2 is larger than the diameter of the hole at the end away from the heating belt assembly 2.

[0111] In the illustrated embodiment of the present invention, the first shielding portion 33 is provided with a first force-applying portion 332 . The first force-applying portion 332 is a hexagonal nut including six outer side surfaces.

[0112] In the illustrated embodiment of the utility model, the first electrode 31, the first insulating portion 32 and the first shielding portion 33 are assembled into an integral first electrode assembly 3. Then, the first electrode assembly 3 is passed through the first mounting hole 13. In the illustrated embodiment of the utility model, the aperture of the first mounting hole 13 is larger than the outer diameter of the first electrode assembly 3 corresponding to the position of the first mounting hole 13, so that the first electrode assembly 3 can pass through the first mounting hole 13 more easily. This design is conducive to improving the elasticity of installation and improving the convenience of installation. The first fixing portion 313 passes through the first mounting hole 13 and is fixed in the first fixing hole 513. In one embodiment of the utility model, the first fixing portion 313 is provided with an external thread (not shown), and the external thread of the first fixing portion 313 matches the internal thread of the first fixing hole 513. The external thread of the first fixing portion 313 and the internal thread of the first fixing hole 513 can be tightened by the hexagonal nut and with the help of the matching installation tool. When the first electrode assembly 3 is installed in place, the first shielding portion 33 is located between the first electrode 31 and the first shielding portion 33 , and the first shielding portion 33 extends through the first installation hole 13 and the first clearance hole 331 , and at least partially extends into the installation space 10 .

[0113] Of course, those skilled in the art will appreciate that the first shielding portion 33 may not be provided with the first force applying portion 332. At this time, when the first electrode assembly 3 is installed on the first connecting block 5, the first external thread portion 314 may be used to tighten the external thread of the first fixing portion 313 and the internal thread of the first fixing hole 513 using an installation tool.

[0114] In the illustrated embodiment of the utility model, the first fixing portion 313 protrudes from the second surface 512 to facilitate observation of the installation. The first fixing portion 313 partially protrudes into the first clearance space 53, but the end of the first fixing portion 313 and the heating belt assembly 2 directly opposite to it still maintain an appropriate safety distance to avoid direct contact between the end of the first fixing portion 313 and the heating belt assembly 2 directly opposite to it. It can be understood by those skilled in the art that the utility model, by providing the first clearance space 53, is conducive to reducing the risk of direct contact between the end of the first fixing portion 313 and the heating belt assembly 2 directly opposite to it.

[0115] Compared with the related art, the present invention realizes the connection and fixation between the first electrode 31 and the first connecting block 5 by mechanical connection, thereby avoiding the damage to the first electrode 31 caused by the high temperature generated during the welding connection.

[0116] Similarly, the second electrode assembly 4 includes a second electrode 41, a second insulating portion 42 disposed on the second electrode 41, and a second shielding portion 43 fixed to the second insulating portion 42. In one embodiment of the utility model, the second electrode 41 includes a second main body 411, a second transition portion 412 connected to one end of the second main body 411, a second fixing portion 413 connected to the other end of the second main body 411, and a second external threaded portion 414 connected to the second transition portion 412. In the illustrated embodiment of the utility model, the second external threaded portion 414, the second transition portion 412, the second main body 411, and the second fixing portion 413 are connected in sequence. In the illustrated embodiment of the utility model, the outer diameter of the second main body 411 is greater than the outer diameter of the second external threaded portion 414. The second transition portion 412 is truncated cone-shaped, which includes a large diameter end connected to the second main body 411 and a small diameter end connected to the second external threaded portion 414, so that the second main body 411, the second transition portion 412, and the second external threaded portion 414 change gradually. An outer diameter of the second fixing portion 413 is smaller than an outer diameter of the second main body portion 411 .

[0117] In the illustrated embodiment of the present invention, the second insulating portion 42 is a ceramic sleeve, which is sleeved on the second main body 411 to insulate the second electrode 41 from the second shielding portion 43. The second shielding portion 43 is provided with a second through hole 430, and the second insulating portion 42 is fixed in the second through hole 430 in an interference fit manner.

[0118] Of course, those skilled in the art will understand that the second insulating portion 42 is also an insulating coating (such as a ceramic coating) plated on the second main body portion 411 , which can also play an insulating role, and the present invention will not elaborate on this.

[0119] In the illustrated embodiment of the present invention, the second shielding portion 43 is welded and fixed to the outer surface 11 of the housing 1, and the second shielding portion 43 shields the second mounting hole 14. In addition, in order to prevent the heat generated during welding from damaging the second electrode 41 and / or the second insulating portion 42, a second clearance hole 431 is further provided inside the second shielding portion 43 to reduce heat transfer through air as quickly as possible. In the illustrated embodiment of the present invention, the second clearance hole 431 is generally conical, and the diameter of the hole at one end radially close to the heating belt assembly 2 is larger than the diameter of the hole at one end away from the heating belt assembly 2.

[0120] In the illustrated embodiment of the present invention, the second shielding portion 43 is provided with a second force-applying portion 432 . The second force-applying portion 432 is a hexagonal nut including six outer side surfaces.

[0121] In the illustrated embodiment of the present utility model, the second electrode 41, the second insulating portion 42 and the second shielding portion 43 are assembled into an integral second electrode assembly 4. Then, the second electrode assembly 4 is passed through the second mounting hole 14. In the illustrated embodiment of the present utility model, the aperture of the second mounting hole 14 is larger than the outer diameter of the second electrode assembly 4 at the position corresponding to the second mounting hole 14, so that the second electrode assembly 4 can pass through the second mounting hole 14 more easily. This design is conducive to improving the elasticity of installation and improving the convenience of installation. The second fixing portion 413 passes through the second mounting hole 14 and is fixed in the second fixing hole 613. In one embodiment of the present utility model, the second fixing portion 413 is provided with an external thread (not shown), and the external thread of the second fixing portion 413 matches the internal thread of the second fixing hole 613. The external thread of the second fixing portion 413 and the internal thread of the second fixing hole 613 can be tightened by the hexagonal nut and with the help of the matching installation tool. When the second electrode assembly 4 is installed in place, the second shielding portion 43 is located between the second electrode 41 and the second shielding portion 43 , and the second shielding portion 43 extends through the second installation hole 14 and the second clearance hole 431 , and at least partially extends into the installation space 10 .

[0122] Of course, those skilled in the art will appreciate that the second shielding portion 43 may not be provided with the second force applying portion 432. At this time, when the second electrode assembly 4 is installed on the second connecting block 6, the second external thread portion 414 may be used to tighten the external thread of the second fixing portion 413 and the internal thread of the second fixing hole 613 using an installation tool.

[0123] In the illustrated embodiment of the present invention, the second fixing portion 413 protrudes from the fourth surface 612 to facilitate observation of the installation. The second fixing portion 413 partially protrudes into the second clearance space 63, but the end of the second fixing portion 413 and the heating belt assembly 2 directly opposite to it still maintain an appropriate safety distance to avoid direct contact between the end of the second fixing portion 413 and the heating belt assembly 2 directly opposite to it. It can be understood by those skilled in the art that the present invention, by providing the second clearance space 63, is conducive to reducing the risk of direct contact between the end of the second fixing portion 413 and the heating belt assembly 2 directly opposite to it.

[0124] Compared with the related art, the present invention realizes the connection and fixation between the second electrode 41 and the second connecting block 6 by mechanical connection, thereby avoiding the damage to the second electrode 41 caused by the high temperature generated during the welding connection.

[0125] Those skilled in the art will appreciate that one of the first electrode 31 and the second electrode 41 of the present invention is a positive electrode and the other is a negative electrode. Preferably, the first electrode assembly 3 and the second electrode assembly 4 have the same structure so that they can share parts and save costs. Preferably, the first connecting block 5 and the second connecting block 6 have the same structure so that they can share parts and save costs.

[0126] The support frame 7 is made of metal material. The support frame 7 includes an inner edge portion 71, an outer edge portion 72, and a plurality of spokes 73 connecting the inner edge portion 71 and the outer edge portion 72. The outer edge portion 72 is located on a circular contour line. The outer edge portion 72 is provided with a first notch 721 and a second notch 722, wherein the first notch 721 corresponds to the first electrode assembly 3, and the second notch 722 corresponds to the second electrode assembly 4. The first notch 721 and the second notch 722 allow the exhaust gas to flow through, reducing the shielding of the first electrode assembly 3 and the second electrode assembly 4, thereby helping to reduce the risk of overheating of the first electrode 31 and the second electrode 41. The inner edge portion 71 is in the shape of a frame surrounded by the periphery to increase the structural strength.

[0127] Those skilled in the art will understand that, in general, in order to improve the structural strength, the outer edge portion 72 is designed as an integral outer frame structure. However, this design causes the outer frame structure to block the first electrode assembly 3 and the second electrode assembly 4, which is not conducive to heat dissipation. The utility model innovatively designs the first notch 721 and the second notch 722 to solve the risk of overheating of the first electrode 31 and the second electrode 41 due to being blocked by the outer edge portion 72.

[0128] In the illustrated embodiment of the present invention, the outer edge portion 72 is welded and fixed to the inner surface 12 of the shell 1 to be fixed to the shell 1 .

[0129] The inner edge portion 71 is connected to the outer edge portion 72 via the spokes 73, and the spokes 73 can play a role in strengthening the structural strength. In the illustrated embodiment of the utility model, each spoke 73 is provided with a plurality of mounting through holes 731. Preferably, the mounting through holes 731 are waist-shaped holes. Of course, those skilled in the art will appreciate that the mounting through holes 731 can also be designed into other shapes. The mounting through holes 731 can adjust the mounting tolerance, which is conducive to improving the convenience of assembling the pin assembly 8.

[0130] The pin assembly 8 includes a pin 81, a first ceramic sleeve 82, a second ceramic sleeve 83 and an end cap 84. In one embodiment of the present invention, the pin 81 and the end cap 84 are both made of metal material. The pin 81 includes an abutment portion 811 and a pin portion 812 connected to the abutment portion 81. The first ceramic sleeve 82 includes a first base 821 and a first cylindrical portion 822 connected to the first base 821. The first base 821 is provided with a first plug hole 8211, and the first cylindrical portion 822 is provided with a channel 8221 connected to the first plug hole 8211. The second ceramic sleeve 83 includes a second plug hole 831. The end cap 84 is provided with a mounting plug hole 841. In the embodiment shown in the figure of the present invention, the end cap 84 is roughly spherical. Of course, those skilled in the art can understand that the shape of the end cap 84 can also be other shapes, and the present invention is not limited to this.

[0131] During assembly, the pin 81 is first inserted into the channel 8221 of the first ceramic sleeve 82 from the first insertion hole 8211 of the first ceramic sleeve 82, and the abutment portion 811 abuts against the first base portion 821 to limit the abutment portion 811. The pin portion 812 passes through the first cylindrical portion 822 and extends out of the first cylindrical portion 822. Then, the pin 81 and the first ceramic sleeve 82 are inserted into the corresponding gap hole 22 as a whole, and the first cylindrical portion 822 of the first ceramic sleeve 82 is located in the corresponding gap hole 22 to prevent the pin 81 from contacting the heating belt assembly 2. Then, the second ceramic sleeve 83 is sleeved on the pin portion 812, and the pin portion 812 passes through the second insertion hole 831 and extends out of the second ceramic sleeve 83. At this time, the first base portion 821 of the first ceramic sleeve 82 and the second ceramic sleeve 83 are respectively located on both sides of the heating belt assembly 2 along the axial direction. The pin portion 812 passes through the corresponding mounting through-hole 731 on the support frame 7. Then, the end cap 84 is sleeved on the pin portion 812. In the illustrated embodiment of the present invention, the pin portion 812 is inserted into the mounting socket 841 and extends out of the end cap 84. Of course, those skilled in the art will understand that the pin portion 812 may not extend out of the end cap 84. Finally, the end cap 84 is melted by heating, and the melted end cap 84 is used as a filler and solder to fix the pin portion 812 and the support frame 7 together on the one hand, and to fill the mounting through-hole 731 on the other hand. Those skilled in the art will understand that the size of the mounting through-hole 731 of the present invention is larger than the size of the pin portion 812, so that the pin portion 812 can pass through the mounting through-hole 731. In addition, the present invention innovatively solves the problem of filling the installation through hole 731 by providing the end cap 84 , which improves the aesthetics while also increasing the bonding force between the pin portion 812 and the support frame 7 .

[0132] Compared with the prior art, the electric heater 100 of the utility model includes a first connecting block 5, which is provided with a first fixing hole 513; the first electrode assembly 3 includes a first electrode 31, which is provided with a first fixing portion 313, and the first fixing portion 313 is connected to the first fixing hole 513 by threaded cooperation; such an arrangement avoids the structural reliability problems that may be caused by direct welding of the first electrode 31 and the heating belt assembly 2, and improves durability.

[0133] Similarly, the electric heater 100 of the utility model includes a second connecting block 6, which is provided with a second fixing hole 613; the second electrode assembly 4 includes a second electrode 41, which is provided with a second fixing portion 413, and the second fixing portion 413 is connected to the second fixing hole 613 by threaded fitting; such an arrangement avoids the structural reliability problems that may be caused by direct welding of the second electrode 41 and the heating belt assembly 2, thereby improving durability.

[0134] In addition, the utility model provides the first connecting block 5 and the second connecting block 6 with the above structure, utilizes the first mounting groove 524 on the first connecting block 5 to accommodate the first extension portion 211, and utilizes the second mounting groove 624 on the second connecting block 6 to accommodate the second extension portion 212, which is beneficial for distributing the current relatively evenly to each layer of the heating belt 21 through the first connecting block 5 and the second connecting block 6, thereby facilitating improving the temperature uniformity of the electric heater 100 and reducing the risk of local overheating.

[0135] The above embodiments are only used to illustrate the present invention but not to limit the technical solutions described in the present invention. The understanding of this specification should be based on the technicians in the relevant technical field. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that technicians in the relevant technical field can still modify or replace the present invention with equivalents, and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An electric heater (100), configured to be used in an exhaust gas post-treatment device, characterized in that: The electric heater (100) comprises: A housing (1), the housing (1) comprising an installation space (10), an outer surface (11), an inner surface (12) opposite to the outer surface (11), and a first installation hole (13) penetrating the outer surface (11) and the inner surface (12) and communicating with the installation space (10); A heating belt assembly (2), wherein the heating belt assembly (2) is at least partially located in the installation space (10); A first connecting block (5), the first connecting block (5) being connected to the heating belt assembly (2), the first connecting block (5) being provided with a first fixing hole (513); A first electrode assembly (3), the first electrode assembly (3) comprising a first electrode (31), the first electrode (31) being provided with a first fixing portion (313), the first fixing portion (313) passing through the first mounting hole (13) and being connected to the first fixing hole (513) by means of threaded engagement; A second electrode assembly (4), the second electrode assembly (4) comprising a second electrode (41), the second electrode (41) being directly or indirectly connected to the heating belt assembly (2); One of the first electrode (31) and the second electrode (41) is a positive electrode, and the other is a negative electrode.

2. The electric heater (100) according to claim 1, characterized in that: The first fixing hole (513) is provided with an internal thread, and the first fixing portion (313) is provided with an external thread, and the internal thread and the external thread match each other.

3. The electric heater (100) according to claim 1, characterized in that: The first electrode assembly (3) further comprises a first insulating portion (32) arranged on the first electrode (31); The first electrode (31) comprises a first main body portion (311), the first fixing portion (313) is connected to the first main body portion (311), and the first insulating portion (32) at least partially covers the first main body portion (311).

4. The electric heater (100) according to claim 3, characterized in that: The first main body portion (311) and the first fixing portion (313) are both cylindrical, wherein the outer diameter of the first fixing portion (313) is smaller than the outer diameter of the first main body portion (311).

5. The electric heater (100) according to claim 3, characterized in that: The first insulating part (32) is a ceramic sleeve, and the ceramic sleeve is sleeved on the first main body part (311) to at least partially cover the first main body part (311).

6. The electric heater (100) according to claim 3, characterized in that: The first insulating portion (32) is an insulating coating plated on the first main body portion (311).

7. The electric heater (100) according to claim 3, characterized in that: The first electrode (31) also includes a first transition portion (312) connected to the first main body (311) and a first external thread portion (314) connected to the first transition portion (312), and the first external thread portion (314), the first transition portion (312), the first main body (311) and the first fixing portion (313) are connected in sequence.

8. The electric heater (100) according to claim 7, characterized in that: The first transition portion (312) is in a truncated cone shape and has a gradually changing outer diameter. The first transition portion (312) comprises a large-diameter end connected to the first main body portion (311) and a small-diameter end connected to the first external thread portion (314).

9. The electric heater (100) according to claim 3, characterized in that: The first electrode assembly (3) further comprises a first shielding portion (33) fixed to the first insulating portion (32); the first shielding portion (33) is fixed to the outer surface (11) of the shell (1) to shield the first mounting hole (13).

10. The electric heater (100) according to claim 9, characterized in that: The first shielding portion (33) is provided with a first through hole (330), and the first insulating portion (32) is fixed in the first through hole (330) in an interference fit manner.

11. The electric heater (100) according to claim 10, characterized in that: A first clearance hole (331) is also provided inside the first shielding portion (33), one end of the first insulating portion (32) extends out of the first shielding portion (33), and the other end of the first insulating portion (32) passes through the first through hole (330) and is at least partially located in the first clearance hole (331).

12. The electric heater (100) according to claim 9, characterized in that: The first shielding portion (33) is welded and fixed to the outer surface (11) of the shell (1).

13. The electric heater (100) according to claim 1, characterized in that: The first mounting hole (13) is larger than the outer diameter of the first electrode assembly (3) at a position corresponding to the first mounting hole (13), so that the first electrode assembly (3) can be easily passed through the first mounting hole (13).

14. The electric heater (100) according to claim 1, characterized in that: The heating belt assembly (2) comprises a plurality of layers of heating belts (21), wherein the plurality of layers of heating belts (21) are stacked and wound to form a disc shape, and each layer of the heating belt (21) comprises a wave portion (210) and a first extension portion (211) connected to one end of the wave portion (210); The first connecting block (5) comprises a first mounting groove (524), and the first extension portion (211) is received in the first mounting groove (524).

15. The electric heater (100) according to claim 14, characterized in that: Each first extension portion (211) is in the shape of a straight strip, and the first extension portions (211) of the plurality of layers of heating belts (21) are parallel to each other; The first installation grooves (524) of the first connection block (5) are multiple and parallel to each other; The first extension portion (211) is received in the corresponding first installation groove (524).

16. The electric heater (100) according to claim 15, characterized in that: The first extension portions (211) of the plurality of layers of heating belts (21) are arranged at equal intervals; and the first mounting grooves (524) of the first connecting blocks (5) are arranged at equal intervals.

17. The electric heater (100) according to claim 14, characterized in that: The first connecting block (5) comprises a first side surface (521), a second side surface (522) opposite to the first side surface (521), and a first end surface (523); The first mounting groove (524) passes through the first end surface (523), and the first mounting groove (524) passes through the first side surface (521) and the second side surface (522) along the axial direction of the electric heater (100).

18. The electric heater (100) according to claim 14, characterized in that: The first connection block (5) is made of a metal material, and comprises a first mounting portion (51), a first connection portion (52) connected to the first mounting portion (51), and a first clearance space (53) located inside the first mounting portion (51); The first mounting portion (51) comprises a first surface (511) and a second surface (512) opposite to the first surface (511); the first fixing hole (513) is provided on the first mounting portion (51); the first fixing hole (513) passes through the first surface (511) and the second surface (512) and is in communication with the first clearance space (53).

19. The electric heater (100) according to claim 18, characterized in that: After passing through the first fixing hole (513), the first fixing portion (313) at least partially protrudes into the first clearance space (53).

20. The electric heater (100) according to claim 1, characterized in that: The electric heater (100) further comprises a support frame (7) at least partially located in the installation space (10) and a pin assembly (8) for fixing the heating belt assembly (2) to the support frame (7) along the axial direction of the electric heater (100), wherein the support frame (7) is fixed to the inner surface (12) of the shell (1).

21. The electric heater (100) according to claim 20, characterized in that: The support frame (7) comprises an inner edge (71), an outer edge (72) and a plurality of spokes (73) connecting the inner edge (71) and the outer edge (72); the outer edge (72) is located on a circular contour line; the outer edge (72) is provided with a first notch (721) and a second notch (722), wherein the first notch (721) corresponds to the first electrode assembly (3), and the second notch (722) corresponds to the second electrode assembly (4).

22. The electric heater (100) according to claim 20, characterized in that: The pin assembly (8) comprises a pin (81), a first ceramic sleeve (82), a second ceramic sleeve (83) and an end cap (84); The insertion pin (81) comprises an abutment portion (811) and an insertion pin portion (812) connected to the abutment portion (811); The first ceramic sleeve (82) comprises a first base (821) and a first cylindrical portion (822) connected to the first base (821), the first base (821) is provided with a first plug hole (8211), and the first cylindrical portion (822) is provided with a channel (8221) connected to the first plug hole (8211); The second ceramic sleeve (83) comprises a second plug hole (831); The end cap (84) is provided with a mounting socket (841); The plug pin (81) is inserted from the first plug hole (8211) of the first ceramic sleeve (82) into the channel (8221) of the first ceramic sleeve (82), the plug pin (81) passes through the channel (8221) and is inserted into the second plug hole (831), and the plug pin (81) passes through the second plug hole (831) and is inserted into the installation plug hole (841).

23. The electric heater (100) according to claim 22, characterized in that: The heating belt assembly (2) includes a gap hole (22), the first cylindrical portion (822) is inserted into the gap hole (22), the first base (821) of the first ceramic sleeve (82) and the second ceramic sleeve (83) are respectively located on both sides of the heating belt assembly (2), the support frame (7) is provided with a mounting through hole (731), and the pin (81) passes through the mounting through hole (731) after passing through the second plug hole (831) and before being inserted into the mounting plug hole (841).

24. The electric heater (100) according to claim 23, characterized in that: The end cap (84) is located on one side of the support frame (7), and the end cap (84) is heated and melted to fill the installation through hole (731).

25. The electric heater (100) according to claim 23, characterized in that: The mounting through hole (731) is a waist-shaped hole, and the size of the waist-shaped hole is larger than the outer diameter of the insertion pin (81).

26. The electric heater (100) according to claim 1, characterized in that: The housing (1) comprises a second mounting hole (14) penetrating the outer surface (11) and the inner surface (12) and communicating with the mounting space (10); The electric heater (100) further comprises a second connecting block (6), the second connecting block (6) being connected to the heating belt assembly (2), and the second connecting block (6) being provided with a second fixing hole (613); The second electrode assembly (4) comprises a second electrode (41), the second electrode (41) being provided with a second fixing portion (413), the second fixing portion (413) passing through the second mounting hole (14) and being connected to the second fixing hole (613) by means of threaded engagement.

27. The electric heater (100) according to claim 26, characterized in that: The first connecting block (5) and the second connecting block (6) have the same structure; the first electrode assembly (3) and the second electrode assembly (4) have the same structure.

28. An exhaust gas post-treatment device, characterized in that: include: Air intake assembly (200); an electric heater (100) located downstream of the air intake assembly (200) along the air flow direction; a first exhaust gas post-processing module (300) located downstream of the electric heater (100) along the airflow direction; a second exhaust gas post-processing module (400) located downstream of the first exhaust gas post-processing module (300) along the airflow direction; a mixer assembly (500) located downstream of the second exhaust gas after-treatment module (400) along the airflow direction; a third exhaust gas after-treatment module (700) located downstream of the mixer assembly (500) along the airflow direction; as well as An air outlet component (800) located downstream of the third exhaust gas post-processing module (700) along the airflow direction; Wherein, the electric heater (100) is the electric heater (100) according to any one of claims 1 to 27.

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