Electric heater and tail gas aftertreatment device

Abstract

An electric heater comprises a shell, a heating belt assembly, a first connecting block, a second connecting block, a first electrode assembly and a second electrode assembly. The heating belt assembly comprises a plurality of layers of heating belts, and each layer of heating belt comprises a wave part, a first extension part and a second extension part. The first connecting block is provided with a plurality of first mounting grooves, and the first extending parts are at least partially contained in the first mounting grooves. The second connecting block is provided with a plurality of second mounting grooves, and the second extension parts are at least partially accommodated in the second mounting grooves. And the first electrode assembly is connected with the first connecting block. And the second electrode assembly is connected with the second connecting block. By means of the arrangement, the structural reliability that the heating belt is connected with the first connecting block and the second connecting block is improved. In addition, the utility model also 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 housing and an exhaust gas aftertreatment carrier encapsulated in the housing. The exhaust gas aftertreatment carrier has a working temperature range, that is, only when the temperature reaches this working 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 the exhaust gas aftertreatment device. Especially when the engine is cold-started, the temperature of the exhaust gas is relatively low and cannot reach the working temperature of the exhaust gas aftertreatment carrier. At this time, the exhaust gas aftertreatment carrier does not work or its conversion efficiency is extremely low, which is likely to cause problems such as emission pollution.

[0004] Therefore, how to minimize the time to reach the working temperature of the exhaust gas aftertreatment carrier is a technical problem faced by those skilled in the art.

[0005] An electric heater is a device that uses electric energy to heat the exhaust gas so as to shorten the time to reach the working temperature of the exhaust gas aftertreatment carrier, and it is one of the important technical means in the industry.

[0006] An electric heater generally includes a housing, a heating element, and electrodes. Among them, the electrodes are usually connected to the heating element by welding, and this connection method still has room for improvement. Summary of the Utility Model

[0007] The purpose of the present utility model is to provide an electric heater and an exhaust gas aftertreatment device with relatively high reliability.

[0008] To achieve the above purpose, the present utility model adopts the following technical solutions: An electric heater, which includes:

[0009] A housing, the housing includes an installation space;

[0010] A heating tape assembly, at least part of the heating tape assembly is located in the installation space. The heating tape assembly includes several layers of heating tapes. The several layers of heating tapes are stacked and wound with each other to form a disk shape. Each layer of heating tape includes a wave portion, a first extension portion connected to one end of the wave portion, and a second extension portion connected to the other end of the wave portion;

[0011] A first connection block, the first connection block is provided with several first installation grooves, and at least part of the first extension portion is received in the first installation grooves;

[0012] A second connection block, the second connection block is provided with several second installation grooves, and at least part of the second extension portion is received in the second installation grooves;

[0013] The first electrode assembly, the first electrode assembly includes a first electrode, and the first electrode is connected to the first connection block;

[0014] The second electrode assembly, the second electrode assembly includes a second electrode, and the second electrode is connected to the second connection block;

[0015] One of the first electrode and the second electrode is a positive electrode, and the other is a negative electrode.

[0016] As a further improved technical solution of the present invention, each first extension portion is in a straight strip shape; and / or

[0017] Each second extension portion is in a straight strip shape.

[0018] As a further improved technical solution of the present invention, each first extension portion is in a straight strip shape, and the first extension portions of the plurality of layers of heating belts are parallel to each other;

[0019] The plurality of first mounting grooves of the first connection block are parallel to each other.

[0020] As a further improved technical solution of the present invention, the first extension portions of the plurality of layers of heating belts are arranged at equal intervals; the first mounting grooves of the first connection block are arranged at equal intervals.

[0021] As a further improved technical solution of the present invention, each second extension portion is in a straight strip shape, and the second extension portions of the plurality of layers of heating belts are parallel to each other;

[0022] The plurality of second mounting grooves of the second connection block are parallel to each other.

[0023] As a further improved technical solution of the present invention, the second extension portions of the plurality of layers of heating belts are arranged at equal intervals; the second mounting grooves of the second connection block are arranged at equal intervals.

[0024] As a further improved technical solution of the present invention, the first connection block and the second connection block have the same structure.

[0025] As a further improved technical solution of the present invention, the first electrode assembly and the second electrode assembly have the same structure.

[0026] As a further improved technical solution of the present invention, the housing includes an outer surface, an inner surface opposite to the outer surface, and a first mounting hole penetrating through the outer surface and the inner surface and communicating with the installation space;

[0027] The first connection block is provided with a first fixing hole;

[0028] The first electrode is provided with a first fixing part, and the first fixing part passes through the first mounting hole and is connected to the first fixing hole in a threaded engagement manner.

[0029] As a further improved technical solution of the present utility model, the first fixing hole is provided with internal threads, the first fixing part is provided with external threads, and the internal threads and the external threads are engaged with each other.

[0030] As a further improved technical solution of the present utility model, the first electrode assembly further includes a first insulating part provided on the first electrode;

[0031] The first electrode includes a first main body part, the first fixing part is connected to the first main body part, and the first insulating part at least partially covers the first main body part.

[0032] As a further improved technical solution of the present utility model, both the first main body part and the first fixing part are cylindrical, and the outer diameter of the first fixing part is smaller than the outer diameter of the first main body part.

[0033] As a further improved technical solution of the present utility model, 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.

[0034] As a further improved technical solution of the present utility model, the first insulating part is an insulating coating plated on the first main body part.

[0035] As a further improved technical solution of the present utility model, the first electrode further includes a first transition part connected to the first main body part and a first external thread part connected to the first transition part, and the first external thread part, the first transition part, the first main body part and the first fixing part are connected in sequence.

[0036] As a further improved technical solution of the present utility model, the first transition part is frustum-shaped and has a gradually changing outer diameter, and the first transition part includes a large-diameter end connected to the first main body part and a small-diameter end connected to the first external thread part.

[0037] As a further improved technical solution of the present utility model, the first electrode assembly further includes a first shielding part fixed to the first insulating part, and the first shielding part is fixed to the outer surface of the housing to shield the first mounting hole.

[0038] As a further improved technical solution of the present utility model, the first shielding part is provided with a first through hole, and the first insulating part is fixed in the first through hole in an interference fit manner.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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;

[0043] 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.

[0044] 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;

[0045] 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.

[0046] 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.

[0047] 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 shell.

[0048] 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.

[0049] As a further improved technical solution of the present utility model, the pin assembly includes a pin, a first ceramic sleeve, a second ceramic sleeve, and an end cap;

[0050] The pin includes an abutting portion and a pin portion connected to the abutting portion;

[0051] The first ceramic sleeve includes a first base portion and a first cylindrical portion connected to the first base portion. The first base portion is provided with a first insertion hole, and the first cylindrical portion is provided with a channel communicating with the first insertion hole;

[0052] The second ceramic sleeve includes a second insertion hole;

[0053] The end cap is provided with a mounting insertion hole;

[0054] The pin is inserted into the channel of the first ceramic sleeve from the first insertion hole of the first ceramic sleeve. The pin passes through the channel and is inserted into the second insertion hole. The pin passes through the second insertion hole and is inserted into the mounting insertion hole.

[0055] As a further improved technical solution of the present utility model, the heating tape assembly includes a clearance hole. The first cylindrical portion is inserted into the clearance hole. The first base portion of the first ceramic sleeve and the second ceramic sleeve are respectively located on both sides of the heating tape assembly. The support frame is provided with a mounting through hole. After passing through the second insertion hole, the pin passes through the mounting through hole before being inserted into the mounting insertion hole.

[0056] As a further improved technical solution of the present 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 mounting through hole.

[0057] As a further improved technical solution of the present utility model, the mounting through hole is an oval hole, and the size of the oval hole is larger than the outer diameter of the pin.

[0058] The present utility model also discloses an exhaust gas after-treatment device, which includes:

[0059] An intake component;

[0060] An electric heater located downstream of the intake component along the gas flow direction;

[0061] A first exhaust gas after-treatment module located downstream of the electric heater along the gas flow direction;

[0062] A second exhaust gas after-treatment module located downstream of the first exhaust gas after-treatment module along the gas flow direction;

[0063] A mixer assembly located downstream of the second exhaust gas after-treatment module along the gas flow direction;

[0064] A third exhaust gas post-treatment module located downstream of the mixer assembly along the air flow direction; and

[0065] An air outlet assembly located downstream of the third exhaust gas post-treatment module along the air flow direction;

[0066] Wherein, the electric heater is the aforementioned electric heater.

[0067] Compared with the prior art, the electric heater of the present utility model comprises a heating tape assembly, a first connection block and a second connection block. The heating tape assembly comprises a plurality of layers of heating tapes, and the plurality of layers of heating tapes are stacked and wound with each other to form a disc shape. Each layer of heating tape comprises a wave part, a first extension part connected to one end of the wave part, and a second extension part connected to the other end of the wave part. The first connection block is provided with a plurality of first installation grooves, and at least a part of the first extension part is received in the first installation grooves. The second connection block is provided with a plurality of second installation grooves, and at least a part of the second extension part is received in the second installation grooves. With such a setting, the present utility model improves the structural reliability of the connection between the heating tape and the first connection block and the second connection block respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 is a schematic diagram of the principle of the exhaust gas post-treatment device of the present utility model.

[0069] Figure 2 is a perspective view of the electric heater of the present utility model in one embodiment.

[0070] Figure 3 is Figure 2 a perspective view from another angle.

[0071] Figure 4 is Figure 2 the front view of.

[0072] Figure 5 is Figure 3 the front view of.

[0073] Figure 6 is Figure 4 a partial enlarged view of the framed part A in.

[0074] Figure 7 is Figure 4 a partial enlarged view of the framed part B in.

[0075] Figure 8 is Figure 2 the left view of.

[0076] Figure 9 is along Figure 8Schematic cross-sectional view of the C-C line.

[0077] Figure 10 is Figure 2 Partial three-dimensional exploded view, in which the first electrode assembly and the second electrode assembly are separated.

[0078] Figure 11 is Figure 10 Partial three-dimensional exploded view from another angle.

[0079] Figure 12 is Figure 10 Further partial three-dimensional exploded view, in which the first electrode assembly and the second electrode assembly are further disassembled.

[0080] Figure 13 is Figure 12 Partial three-dimensional exploded view from another angle.

[0081] Figure 14 is Figure 12 Further partial three-dimensional exploded view, in which the housing is further disassembled.

[0082] Figure 15 is Figure 14 Partial three-dimensional exploded view from another angle.

[0083] Figure 16 is Figure 14 Progressive three-dimensional exploded view.

[0084] Figure 17 is Figure 16 Three-dimensional exploded view from another angle.

[0085] Figure 18 is Figure 16 Three-dimensional schematic view of a pin assembly.

[0086] Figure 19 is Figure 18 Three-dimensional exploded view.

[0087] Figure 20 is Figure 18 Three-dimensional schematic view from another angle.

[0088] Figure 21 is Figure 20 Three-dimensional exploded view.

[0089] Figure 22 Three-dimensional exploded view of the first connection block, the second connection block, the heating tape assembly, the first electrode assembly and the second electrode assembly.

[0090] Figure 23 is Figure 22 Front view.

[0091] Figure 24 is Figure 22 Exploded perspective view from another angle.

[0092] Figure 25 is Figure 24 front view of

[0093] Figure 26 is Figure 23 partial enlarged view of the circled part D in

[0094] Figure 27 is Figure 23 partial enlarged view of the circled part E in

[0095] Figure 28 is a schematic cross-sectional view along the Figure 4 F-F line in Detailed implementation manners

[0096] The following will describe in detail the detailed implementation manners of the present utility model in conjunction with the accompanying drawings. Among them, if there are several detailed implementation manners, and in the case of no conflict, the features in these implementation manners can be combined with each other. When the description involves the accompanying drawings, unless otherwise specified, the same numbers or symbols in different drawings represent the same or similar elements. The content described in the following exemplary detailed implementation manners does not represent all implementation manners of the present utility model. On the contrary, they are only examples of products that are consistent with the present utility model as recorded in the claims of the present utility model.

[0097] The terms used in the present utility model are only for the purpose of describing the detailed implementation manners, and are not intended to limit the protection scope of the present utility model. It should be understood that the terms used in the description and claims of the present utility model, such as "first", "second" and similar terms, do not indicate any order, quantity or importance, but are only used to distinguish the named features.

[0098] Please refer to Figure 1As shown in the figure, the present utility model discloses an exhaust gas aftertreatment device, which includes an intake assembly 200, an electric heater 100 located downstream of the intake assembly 200 along the gas flow direction, a first exhaust gas aftertreatment module 300 (e.g., diesel oxidation catalyst, DOC) located downstream of the electric heater 200 along the gas flow direction, a second exhaust gas aftertreatment module 400 (e.g., diesel particulate filter, DPF) located downstream of the first exhaust gas aftertreatment module 300 along the gas flow direction, a mixer assembly 500 located downstream of the second exhaust gas aftertreatment module 400 along the gas flow direction, a urea nozzle 600 installed on the mixer assembly 500, a third exhaust gas aftertreatment module 700 (e.g., selective catalytic reducer, SCR) located downstream of the mixer assembly 500 along the gas flow direction, and an outlet assembly 800 located downstream of the third exhaust gas aftertreatment module 700 along the gas flow direction. The first exhaust gas aftertreatment module 300, the second exhaust gas aftertreatment module 400, and the third exhaust gas aftertreatment module 700 are collectively referred to as the exhaust gas aftertreatment module. Please refer to Figure 1 As shown, the gas flow direction is Figure 1 the direction indicated by the hollow arrow in

[0099] Please combine with Figures 2 to 28 As shown in the figure, the illustrated embodiment of the present utility model discloses an electric heater 100, which is used in the exhaust gas aftertreatment device. The electric heater 100 includes a housing 1, a heating tape assembly 2 at least partially located in the housing 1, a first electrode assembly 3 installed on the housing 1, a second electrode assembly 4 installed on the housing 1, a first connection block 5 connecting one end of the heating tape assembly 2 to the first electrode assembly 3, a second connection block 6 connecting the other end of the heating tape assembly 2 to the second electrode assembly 4, a support frame 7 at least partially located in the housing 1, and a plurality of pin assemblies 8 fixing the heating tape assembly 2 to the support frame 7 along the axial direction of the electric heater 100.

[0100] In the illustrated embodiment of the present utility model, the housing 1 is made of a metal material, such as stainless steel. The housing 1 is generally in the shape of a hollow cylinder, and the housing 1 is provided with an installation space 10. The housing 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 housing 1 further includes a first installation hole 13 penetrating through the outer surface 11 and the inner surface 12 and communicating with the installation space 10, and a second installation hole 14 penetrating through the outer surface 11 and the inner surface 12 and communicating with the installation space 10. In the illustrated embodiment of the present utility model, both the first installation hole 13 and the second installation hole 14 are circular perforations. 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 of other shapes, including but not limited to oval holes, kidney-shaped holes, rectangular holes, trapezoidal holes, triangular holes, etc., and the present utility model will not elaborate on this. Additionally, in the illustrated embodiment of the present utility model, both the outer surface 11 and the inner surface 12 are arc-shaped surfaces. Of course, those skilled in the art can understand that in other embodiments of the present utility model, the outer surface 11 and the inner surface 12 can also be flat surfaces.

[0101] In the illustrated embodiment of the present utility model, the heating tape assembly 2 includes a plurality of layers of heating tapes 21 made of a metal material. In the illustrated embodiment of the present utility model, the heating tape assembly 2 includes seven layers of heating tapes 21, and each layer of the heating tape 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 in a wave shape, and it is provided with wave crests and wave troughs. Adjacent layers of heating tapes 21 are fixed together. In one embodiment of the present utility model, adjacent layers of heating tapes 21 are fixed together by brazing. Those skilled in the art can understand that the ways of fixing adjacent layers of heating tapes 21 can be various. For example, the wave crest of one heating tape 21 can be fixed to the wave crest of the adjacent heating tape 21; or the wave crest of one heating tape 21 can be fixed to the wave trough of the adjacent heating tape 21; or the wave trough of one heating tape 21 can be fixed to the wave trough of the adjacent heating tape 21. The heating tape assembly 2 includes a plurality of gap holes 22 located between adjacent layers of heating tapes 21. Most of the plurality of gap holes 22 are used for the tail gas to flow through, so as to heat the tail gas by using the heating tape assembly 2.

[0102] Those skilled in the art can understand that the peaks of the heating tapes 21 of each layer can be the same or different, and the valleys of the heating tapes 21 of each layer can also be the same or different. The peaks of the heating tapes 21 of adjacent two layers can be the same or different, and the valleys of the heating tapes 21 of adjacent two layers can also be the same or different.

[0103] In the illustrated embodiment of the present utility model, the several layers of heating tapes 21 are stacked and wound with each other to form a disk shape. The heating tape assembly 2 includes several layers from the inside to the outside in the radial direction, and a gap 23 is provided between the inner heating tape assembly 2 and the outer heating tape assembly 2. The gap 23 is used for the tail gas to flow through, so as to heat the tail gas by using the heating tape assembly 2.

[0104] In the illustrated embodiment of the present utility model, preferably, the lengths of the heating tapes 21 of each layer are the same, so as to distribute the current evenly to each heating tape 21 as much as possible. In the illustrated embodiment of the present utility model, the first extension portion 211 and the second extension portion 212 are both substantially straight strips. Those skilled in the art can understand that the technology used in the present utility model belonging to "straight strips" does not require it to be completely flat and completely straight, and appropriate bending is also acceptable. In an embodiment of the present utility model, the first extension portion 211 and the second extension portion 212 can even be inclined relative to the wavy portion 210. In the illustrated embodiment of the present utility model, the several layers of heating tapes 21 include a first end 24 formed by the several first extension portions 211 and a second end 25 formed by the several second extension portions 212. In the illustrated embodiment of the present utility model, the several first extension portions 211 of the first end 24 are parallel to each other, and the several second extension portions 212 of the second end 25 are also parallel to each other.

[0105] Preferably, in an embodiment of the present utility model, among the several first extension portions 211, the distances between any two adjacent first extension portions 211 are equal. In other words, the several first extension portions 211 are arranged at equal intervals. Compared with the design in which the several first extension portions 211 are stacked and squeezed together, this arrangement is not likely to cause heat concentration after being energized, thereby reducing the risk of excessive local temperature.

[0106] Similarly, in an embodiment of the present utility model, among the several second extension portions 212, the distances between any two adjacent second extension portions 212 are equal. In other words, the several second extension portions 212 are arranged at equal intervals. Compared with the design in which the several second extension portions 212 are stacked and squeezed together, this arrangement is not likely to cause heat concentration after being energized, thereby reducing the risk of excessive local temperature.

[0107] The first connecting block 5 is made of a metallic material and includes a first mounting portion 51, a first connecting portion 52 connected to the first mounting portion 51, and a first relief space 53 located inside the first mounting portion 51. The first mounting portion 51 includes a first surface 511 (e.g., the upper surface), a second surface 512 (e.g., the lower surface) facing away from the first surface 511, and a first fixing hole 513 penetrating through the first surface 511 and the second surface 512 and communicating with the first relief space 53. In an embodiment of the present invention, 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 present invention, the size of the first mounting hole 13 is larger than that 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.

[0108] The first connecting portion 52 includes a first side surface 521, a second side surface 522 facing away from the first side surface 521, a first end surface 523, and a plurality of first mounting grooves 524 penetrating through the first end surface 523. In the illustrated embodiment of the present invention, the first mounting grooves 524 penetrate through the first side surface 521 and the second side surface 522 along the axial direction of the electric heater 100. The first mounting grooves 524 are used to receive the first extension portion 211. In order to improve the elasticity of installation, the length of the first mounting grooves 524 is greater than the length of the first extension portion 211. By this design of receiving the first extension portion 211 in the first mounting grooves 524, it is beneficial to increase the contact area between the first extension portion 211 and the first connecting block 5, and beneficial to improve the connection stability between the two.

[0109] Similarly, the second connecting block 6 is made of a metallic material and includes a second mounting portion 61, a second connecting portion 62 connected to the second mounting portion 61, and a second relief space 63 located inside the second mounting portion 61. The second mounting portion 61 includes a third surface 611 (e.g., the outer surface), a fourth surface 612 (e.g., the inner surface) facing away from the third surface 611, and a second fixing hole 613 penetrating through the third surface 611 and the fourth surface 612 and communicating with the second relief space 63. In an embodiment of the present invention, 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 present invention, the size of the second mounting hole 14 is larger than that 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.

[0110] 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 through the second end surface 623. In the illustrated embodiment of the present utility model, the second mounting grooves 624 penetrate through the third side surface 621 and the fourth side surface 622 along the axial direction of the electric heater 100. The second mounting grooves 624 are used for receiving the second extension portion 212. In order to improve the elasticity of installation, the length of the second mounting groove 624 is greater than the length of the second extension portion 212. By designing to receive the second extension portion 212 in the second mounting groove 624, it is beneficial to increase the contact area between the second extension portion 212 and the second connecting block 6, and is beneficial to improve the connection stability between the two.

[0111] The first electrode assembly 3 includes a first electrode 31, a first insulating portion 32 provided on the first electrode 31, and a first shielding portion 33 fixed to the first insulating portion 32. In an embodiment of the present utility model, the first electrode 31 includes a first main body portion 311, a first transition portion 312 connected to one end of the first main body portion 311, a first fixing portion 313 connected to the other end of the first main body portion 311, and a first external thread portion 314 connected to the first transition portion 312. In the illustrated embodiment of the present utility model, the first external thread portion 314, the first transition portion 312, the first main body portion 311, and the first fixing portion 313 are connected in sequence. In the illustrated embodiment of the present utility model, the outer diameter of the first main body portion 311 is greater than the outer diameter of the first external thread portion 314. The first transition portion 312 is frustum-shaped, and includes 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, so that the first main body portion 311, the first transition portion 312, and the first external thread portion 314 change gradually. The outer diameter of the first fixing portion 313 is smaller than the outer diameter of the first main body portion 311.

[0112] In the illustrated embodiment of the present utility model, the first insulating portion 32 is a ceramic sleeve, which is sleeved on the first main body portion 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.

[0113] Of course, those skilled in the art can understand that the first insulating portion 32 can also be 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 utility model will not elaborate on this.

[0114] In the illustrated embodiment of the present utility model, the first shielding portion 33 is fixedly welded 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 avoid damage to the first electrode 31 and / or the first insulating portion 32 caused by the heat generated during welding, a first relief hole 331 is further provided inside the first shielding portion 33 to reduce heat transfer by air as soon as possible. In the illustrated embodiment of the present utility model, the first relief hole 331 is generally conical, and the aperture of the end thereof closer to the heating tape assembly 2 in the radial direction is larger than the aperture of the end away from the heating tape assembly 2.

[0115] In the illustrated embodiment of the present utility model, the first shielding portion 33 is provided with a first force-applying portion 332, and the first force-applying portion 332 is a hexagonal nut, which includes six outer sides.

[0116] In the illustrated embodiment of the present 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 present utility model, the aperture of the first mounting hole 13 is larger than the outer diameter of the first electrode assembly 3 at the position corresponding to 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 beneficial to improving the elasticity of installation and enhancing 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 an embodiment of the present 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 is matched with 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 means of the hexagonal nut and an installation tool cooperating therewith. 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 mounting hole 13 and the first relief hole 331 and at least partially extends into the installation space 10.

[0117] Of course, those skilled in the art can understand 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 connection block 5, the external thread portion 314 can be utilized, and the external thread of the first fixing portion 313 and the internal thread of the first fixing hole 513 can be tightened by means of an installation tool.

[0118] 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.

[0119] 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.

[0120] 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 .

[0121] 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.

[0122] Of course, those skilled in the art can 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 anymore.

[0123] In the illustrated embodiment of the present invention, the second shielding portion 43 is fixedly welded 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 relief hole 431 is provided inside the second shielding portion 43 to quickly reduce heat transfer through air. In the illustrated embodiment of the present invention, the second relief hole 431 is generally conical, and the aperture of the end thereof along the radial direction close to the heating tape assembly 2 is larger than the aperture of the end away from the heating tape assembly 2.

[0124] In the illustrated embodiment of the present invention, the second shielding portion 43 is provided with a second force-applying portion 432, and the second force-applying portion 432 is a hexagon nut, which includes six outer side surfaces.

[0125] In the illustrated embodiment of the present invention, 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 invention, 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 beneficial to improving the elasticity of installation and enhancing 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 an embodiment of the present invention, the second fixing portion 413 is provided with an external thread (not shown), and the external thread of the second fixing portion 413 is engaged with 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 means of the hexagon nut and a 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 mounting hole 14 and the second relief hole 431 and at least partially extends into the installation space 10.

[0126] Of course, those skilled in the art can understand 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 connection block 6, the second external thread portion 414 can be utilized, and an installation tool can be used to tighten the external thread of the second fixing portion 413 and the internal thread of the second fixing hole 613.

[0127] In the illustrated embodiment of the present utility model, the second fixing portion 413 protrudes from the fourth surface 612 to facilitate observing the installation situation. The second fixing portion 413 partially protrudes into the second relief space 63. However, an appropriate safety distance is still maintained between the end of the second fixing portion 413 and the heating tape assembly 2 opposite thereto, so as to prevent the end of the second fixing portion 413 from coming into direct contact with the heating tape assembly 2 opposite thereto. Those skilled in the art can understand that by providing the second relief space 63 in the present utility model, it is beneficial to reduce the risk of the end of the second fixing portion 413 coming into direct contact with the heating tape assembly 2 opposite thereto.

[0128] Compared with the related art, the present utility model realizes the connection and fixation of the second electrode 41 and the second connection block 6 through a mechanical connection method, avoiding the damage to the second electrode 41 that may be caused by the high temperature generated during welding connection.

[0129] Those skilled in the art can understand that one of the first electrode 31 and the second electrode 41 in the present utility model 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 as to share components and save costs. Preferably, the first connection block 5 and the second connection block 6 have the same structure so as to share components and save costs.

[0130] The support frame 7 is made of a 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 can allow the tail gas to flow through, reducing the shielding of the first electrode assembly 3 and the second electrode assembly 4, thereby being beneficial to reducing 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 peripherally surrounding frame to increase the structural strength.

[0131] Those skilled in the art can understand that, under normal circumstances, in order to improve the structural strength, the outer edge portion 72 is designed as an integral outer frame structure. However, this design will cause 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 present utility model innovatively designs the first notch 721 and the second notch 722, solving the risk of overheating of the first electrode 31 and the second electrode 41 due to being blocked by the outer edge portion 72.

[0132] In the illustrated embodiment of the present utility model, the outer edge portion 72 is welded and fixed to the inner surface 12 of the housing 1 to be fixed to the housing 1.

[0133] The inner edge portion 71 and the outer edge portion 72 are connected by the spoke 73, and the spoke 73 can play a role in strengthening the structural strength. In the illustrated embodiment of the present 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 can understand 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 beneficial to improving the convenience of assembling the pin assembly 8.

[0134] The pin assembly 8 includes a pin 81, a first ceramic sleeve 82, a second ceramic sleeve 83 and an end cap 84. In an embodiment of the present utility model, both the pin 81 and the end cap 84 are made of metal materials. The pin 81 includes an abutting portion 811 and a pin portion 812 connected to the abutting portion 811. The first ceramic sleeve 82 includes a first base portion 821 and a first cylindrical portion 822 connected to the first base portion 821. The first base portion 821 is provided with a first insertion hole 8211, and the first cylindrical portion 822 is provided with a channel 8221 communicating with the first insertion hole 8211. The second ceramic sleeve 83 includes a second insertion hole 831. The end cap 84 is provided with a mounting insertion hole 841. In the illustrated embodiment of the present utility model, the end cap 84 is generally 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 utility model does not limit this.

[0135] During assembly, first insert the pin 81 into the channel 8221 of the first ceramic sleeve 82 from the first jack 8211 of the first ceramic sleeve 82. The abutting portion 811 abuts against the first base portion 821 to limit the abutting portion 811. The pin portion 812 passes through the first cylindrical portion 822 and extends out of the first cylindrical portion 822. Then, insert the pin 81 and the first ceramic sleeve 82 as a whole into the corresponding clearance hole 22. The first cylindrical portion 822 of the first ceramic sleeve 82 is located in the corresponding clearance hole 22 to prevent the pin 81 from contacting the heating tape assembly 2. Then, sleeved the second ceramic sleeve 83 on the pin portion 812. The pin portion 812 passes through the second jack 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 tape assembly 2 along the axis. The pin portion 812 passes through the corresponding mounting through hole 731 on the support frame 7. Then, sleeved the end cap 84 on the pin portion 812. In the illustrated embodiment of the present invention, the pin portion 812 is inserted into the mounting jack 841 and extends out of the end cap 84. Of course, those skilled in the art can understand that the pin portion 812 may not extend out of the end cap 84. Finally, heat the end cap 84 to melt it. The melted end cap 84 serves as a filler and solder. On the one hand, it fixes the pin portion 812 and the support frame 7 together. On the other hand, it fills the mounting through hole 731. Those skilled in the art can understand that the size of the mounting through hole 731 of the present invention is larger than the size of the pin portion 812 to facilitate the pin portion 812 passing through the mounting through hole 731. In addition, the present invention innovatively solves the problem of filling the mounting through hole 731 by setting the end cap 84, which improves the aesthetics and also increases the bonding force between the pin portion 812 and the support frame 7.

[0136] Compared with the prior art, the electric heater 100 of the present invention includes a first connection block 5, and the first connection block 5 is provided with a first fixing hole 513; the first electrode assembly 3 includes a first electrode 31, and the first electrode 31 is provided with a first fixing portion 313. The first fixing portion 313 is connected to the first fixing hole 513 by a threaded fit; thus, the structural reliability problem that may be caused by directly welding the first electrode 31 to the heating tape assembly 2 is avoided, and the durability is improved.

[0137] Similarly, the electric heater 100 of the present utility model includes a second connection block 6, and the second connection block 6 is provided with a second fixing hole 613; the second electrode assembly 4 includes a second electrode 41, and the second electrode 41 is provided with a second fixing portion 413, and the second fixing portion 413 is connected to the second fixing hole 613 in a threaded fit manner; thus configured, it avoids the structural reliability problems that may be caused by directly welding the second electrode 41 to the heating tape assembly 2, and improves the durability.

[0138] In addition, by providing the first connection block 5 and the second connection block 6 with the above structures, the first extension portion 211 is received by the first installation groove 524 on the first connection block 5, and the second extension portion 212 is received by the second installation groove 624 on the second connection block 6, which is beneficial to relatively evenly distribute the current to each layer of the heating tape 21 through the first connection block 5 and the second connection block 6, thereby being beneficial to improving the temperature uniformity of the electric heater 100 and reducing the risk of local overheating.

[0139] The above embodiments are only used to illustrate the present utility model and do not limit the technical solutions described in the present utility model. The understanding of this specification should be based on those skilled in the art of the relevant technical field. Although this specification has described the present utility model in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the relevant technical field can still modify the present utility model or make equivalent substitutions, and all technical solutions and their improvements that do not depart from the spirit and scope of the present utility model shall be covered within the scope of the claims of the present utility model.

Claims

1. An electric heater (100), characterized in that: include: A housing (1), the housing (1) comprising an installation space (10); A heating belt assembly (2), wherein the heating belt assembly (2) is at least partially located in the installation space (10), the heating belt assembly (2) comprises a plurality of layers of heating belts (21), the plurality of layers of heating belts (21) are stacked on top of each other and wound to form a disc shape, and each layer of the heating belt (21) comprises 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); A first connecting block (5), the first connecting block (5) being provided with a plurality of first mounting grooves (524), the first extension portion (211) being at least partially received in the first mounting grooves (524); A second connecting block (6), wherein the second connecting block (6) is provided with a plurality of second mounting grooves (624), and the second extension portion (212) is at least partially received in the second mounting grooves (624); A first electrode assembly (3), the first electrode assembly (3) comprising a first electrode (31), the first electrode (31) being connected to the first connecting block (5); A second electrode assembly (4), the second electrode assembly (4) comprising a second electrode (41), the second electrode (41) being connected to the second connecting block (6); 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: Each first extension portion (211) is in the shape of a straight bar; and / or Each second extension portion (212) is in the shape of a straight bar.

3. The electric heater (100) according to claim 1, 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 plurality of first mounting grooves (524) of the first connecting block (5) are parallel to each other.

4. The electric heater (100) according to claim 3, 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.

5. The electric heater (100) according to claim 1, characterized in that: Each second extension portion (212) is in the shape of a straight strip, and the second extension portions (212) of the plurality of layers of heating belts (21) are parallel to each other; The plurality of second mounting grooves (624) of the second connecting block (6) are parallel to each other.

6. The electric heater (100) according to claim 5, characterized in that: The second extension portions (212) of the plurality of layers of heating belts (21) are arranged at equal intervals; and the second installation grooves (624) of the second connection blocks (6) are arranged at equal intervals.

7. The electric heater (100) according to claim 1, characterized in that: The first connecting block (5) and the second connecting block (6) have the same structure.

8. The electric heater (100) according to claim 1, characterized in that: The first electrode assembly (3) and the second electrode assembly (4) have the same structure.

9. The electric heater (100) according to claim 1, characterized in that: The housing (1) comprises an outer surface (11), an inner surface (12) opposite to the outer surface (11), and a first mounting hole (13) penetrating the outer surface (11) and the inner surface (12) and communicating with the mounting space (10); The first connecting block (5) is provided with a first fixing hole (513); The first electrode (31) is provided with a first fixing portion (313), and the first fixing portion (313) passes through the first mounting hole (13) and is connected to the first fixing hole (513) by means of threaded engagement.

10. The electric heater (100) according to claim 9, 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.

11. The electric heater (100) according to claim 9, 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).

12. The electric heater (100) according to claim 11, 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).

13. The electric heater (100) according to claim 11, 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).

14. The electric heater (100) according to claim 11, characterized in that: The first insulating portion (32) is an insulating coating plated on the first main body portion (311).

15. The electric heater (100) according to claim 11, 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.

16. The electric heater (100) according to claim 15, 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).

17. The electric heater (100) according to claim 11, 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).

18. The electric heater (100) according to claim 17, 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.

19. The electric heater (100) according to claim 18, 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).

20. The electric heater (100) according to claim 17, characterized in that: The first shielding portion (33) is welded and fixed to the outer surface (11) of the shell (1).

21. The electric heater (100) according to claim 9, 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).

22. The electric heater (100) according to claim 1, 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).

23. The electric heater (100) according to claim 9, 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).

24. The electric heater (100) according to claim 23, 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).

25. 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 housing (1).

26. The electric heater (100) according to claim 25, 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).

27. The electric heater (100) according to claim 25, 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).

28. The electric heater (100) according to claim 27, 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).

29. The electric heater (100) according to claim 28, 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).

30. The electric heater (100) according to claim 28, 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).

31. 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 30.

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