Vortex coil electric heater for post-treatment catalysis

Abstract

The utility model provides a vortex coil electric heater for post-treatment catalysis, which comprises one or more first vortex coils, a plurality of second vortex coils and a plurality of second vortex coils, and the first vortex coils are of a multi-layer vortex plate structure which is formed by surrounding heating pipes and is arranged at intervals; the second vortex coil pipe is of a multi-layer vortex plate structure which is formed by surrounding heating pipes and is arranged at intervals; the first vortex coil pipe and the second vortex coil pipe are arranged between an air inlet and an air outlet of the vortex coil pipe electric heater; the first vortex coil pipe is closer to the air inlet than the second vortex coil pipe; and the diameter of the heating pipe of the first vortex coil pipe is smaller than that of the heating pipe of the second vortex coil pipe. Compared with the prior art, the temperature of a catalyst under the low-temperature working condition can be increased, exhaust is heated through electric energy, the catalyst reaches the ignition temperature within the shortest time through heat convection, and therefore it is guaranteed that emissions are effectively treated.

Description

Technical field

[0001] The utility model relates to the technical field of electric heater parts manufacturing, in particular to a vortex coil electric heater for post-processing catalysis. [Background Technology]

[0002] The function of the catalyst will degrade in a low-temperature environment, especially during the cold start phase of the engine. Since the catalyst usually needs to reach above 200°C to work normally, a large amount of pollutants will be directly discharged into the air at this stage, and the catalyst cannot fully play its role.

[0003] Therefore, it is necessary to propose a new technical solution to solve the above problems. [Utility Model Content]

[0004] One of the purposes of the present utility model is to provide a vortex coil electric heater for post-treatment catalysis, which can increase the catalyst temperature under low-temperature conditions, use electrical energy to heat the exhaust gas, and through convection heat transfer, enable the catalyst to reach the ignition temperature in the shortest time, thereby ensuring effective treatment of emissions.

[0005] According to one aspect of the present invention, the present invention provides a vortex coil electric heater for post-treatment catalysis, which includes: one or more first vortex coils, the first vortex coils are mutually spaced multi-layer vortex disc structures surrounded by heating tubes; one or more second vortex coils, the second vortex coils are mutually spaced multi-layer vortex disc structures surrounded by heating tubes; wherein, the first vortex coil and the second vortex coil are arranged between the air inlet and the air outlet of the vortex coil electric heater; the first vortex coil is closer to the air inlet than the second vortex coil; the diameter of the heating tube of the first vortex coil is smaller than the diameter of the heating tube of the second vortex coil.

[0006] Furthermore, a first heating wire is provided in the first vortex coil, and the first end and the second end of the first heating wire are respectively located at the first end and the second end of the first vortex coil; a second heating wire is provided in the second vortex coil, and the first end and the second end of the second heating wire are respectively located at the first end and the second end of the second vortex coil.

[0007] Furthermore, the vortex coil electric heater also includes: a first electrical connection end, which is electrically connected to the first end of the first heating wire and is also electrically connected to the first end of the second heating wire; a second electrical connection end, which is electrically connected to the second end of the first heating wire and is also electrically connected to the second end of the second heating wire.

[0008] Further, the central axis direction of the first scroll coil and the central axis direction of the second scroll coil are consistent with the direction from the air inlet to the air outlet; there is one first scroll coil and one second scroll coil, one first scroll coil and one second scroll coil are arranged in sequence along the direction from the air inlet to the air outlet, and one first scroll coil is closer to the air inlet than one second scroll coil; or there are multiple first scroll coils and multiple second scroll coils, multiple first scroll coils and multiple second scroll coils are arranged in sequence along the direction from the air inlet to the air outlet, and multiple first scroll coils are closer to the air inlet than multiple second scroll coils.

[0009] Furthermore, the vortex coil electric heater also includes heat-conducting fins, which are tightly attached between each two adjacent layers of vortex disk structures in the first vortex coil; the heat-conducting fins are tightly attached between each two adjacent layers of vortex disk structures in the second vortex coil; the heat-conducting fins are also arranged along the first vortex coil and the second vortex coil to form a multi-layer vortex structure spaced apart from each other.

[0010] Furthermore, the heat-conducting fins are of a wave structure; the heat-conducting fins are provided with grooves at the crests and troughs of the wave structure; the grooves at the crests and troughs of the heat-conducting fins are in matching contact with the heating tube of the first scroll coil or the heating tube of the second scroll coil.

[0011] Furthermore, the bottom surface and the circumference of the groove are closed; the cross section of the groove is semicircular, arc-shaped or V-shaped; the position and number of the grooves are related to the number and layers of the first scroll coils, and the number and layers of the second scroll coils.

[0012] Furthermore, the vortex coil electric heater also includes an external structural part, a cavity is formed in the external structural part, and the first vortex coil, the second vortex coil and the heat-conducting fins are located in the cavity; one end of the cavity is the air inlet, and the other end is the air outlet; the exhaust gas flows from the air inlet to the air outlet; after the exhaust gas is heated by the vortex coil electric heater, its heat is transferred to the catalyst.

[0013] Further, the first electrical connection end includes a first insulating plate, a first electrical connection piece and a first terminal located on the outside of the external structural member; the second electrical connection end includes a second insulating plate, a second electrical connection piece and a second terminal located on the outside of the external structural member; the first insulating plate is clamped between the mounting platform of the external structural member and the first electrical connection piece; the first terminal is welded and fixed to the first electrical connection piece; the first end of the first vortex coil is fixed to the mounting platform, and the first end of the first heating wire is electrically connected to the first electrical connection piece; the first end of the second vortex coil is fixed to the mounting platform, and the first end of the second heating wire is electrically connected to the first electrical connection piece; the second insulating plate is clamped between the mounting platform of the external structural member and the second electrical connection piece; the second terminal is welded and fixed to the second electrical connection piece; the second end of the first vortex coil is fixed to the mounting platform, and the second end of the first heating wire is electrically connected to the second electrical connection piece; the second end of the second vortex coil is fixed to the mounting platform, and the second end of the second heating wire is electrically connected to the second electrical connection piece.

[0014] Furthermore, the first insulating plate and the second insulating plate are made of phlogopite material; the heat-conducting fins are formed by roll forming; the diameter ratio of the heating tube of the second vortex coil and the heating tube of the first vortex coil is 6:5 to 8:5; the absolute size of the diameter of the heating tube of the second vortex coil and the heating tube of the first vortex coil is 2 mm to 6 mm; and / or the amplitude / wavelength ratio of the wave structure of the heat-conducting fin is 0.6 to 0.8.

[0015] Compared to existing technologies, this new system utilizes a vortex coil with built-in heating wires and thermally conductive fins attached to the coil's periphery, creating a gridded, small-channel heat exchange system to better transfer heat energy to the exhaust. This increases the catalyst temperature under low-temperature conditions, utilizes electrical energy to heat the exhaust, and through convection heat transfer, brings the catalyst to ignition temperature in the shortest possible time, ensuring effective emissions treatment.

Brief Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work. Among them:

[0017] Figure 1 This is a schematic structural diagram of a vortex coil electric heater for post-processing catalysis in one embodiment of the present invention from a first perspective;

[0018] Figure 2This is a schematic structural diagram of a vortex coil electric heater for post-processing catalysis in one embodiment of the present invention at a second viewing angle;

[0019] Figure 3 This is a structural diagram of a combination of a first scroll coil and a second scroll coil in one embodiment of the present invention;

[0020] Figure 4 This is a structural schematic diagram of a combination of a first scroll coil and a second scroll coil in another embodiment of the present invention;

[0021] Figure 5 A side view of a heat-conducting fin in an embodiment of the present invention in an expanded state;

[0022] Figure 6 This is a top view of the heat-conducting fins in one embodiment of the present invention in an expanded state. [Specific implementation method]

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0024] The term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments. Unless otherwise specified, terms such as "coupled," "connected," "connected," "connected," and "connected" used herein to denote electrical connection refer to direct or indirect connection. For example, "A and B are connected" includes both direct electrical connection between A and B and connection between A and B through electrical components or circuits.

[0025] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "front", "back", "left", "right", "vertical", "perpendicular", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] Please refer to Figure 1 As shown, it is a schematic structural diagram of a vortex coil electric heater for post-processing catalysis in one embodiment of the present invention at a first viewing angle. Figure 2As shown, it is a schematic structural diagram of a vortex coil electric heater for post-processing catalysis in one embodiment of the present invention at a second viewing angle.

[0027] Figure 1 and Figure 2 The illustrated vortex coil electric heater for post-processing catalysis includes one or more first vortex coils 110 and one or more second vortex coils 120. The first vortex coils 110 are formed by heating tubes surrounding a multi-layered vortex structure with spacing between them; the second vortex coils 120 are formed by heating tubes surrounding a multi-layered vortex structure with spacing between them. The first and second vortex coils 110, 120 are positioned between the air inlet and outlet of the vortex coil electric heater.

[0028] exist Figure 1 and Figure 2 In the specific embodiment shown, the first vortex coil 110 is in the shape of a double vortex curve, the two vortex curves are concentric and staggered, one end of the two vortex curves is connected to the vortex center, and the other ends of the two vortex curves serve as the first end and the second end of the first vortex coil 110 respectively; the second vortex coil 120 is also in the shape of a double vortex curve, the two vortex curves are concentric and staggered, one end of the two vortex curves is connected to the vortex center, and the other ends of the two vortex curves serve as the first end and the second end of the second vortex coil 120 respectively.

[0029] If the thickness of the heating tube of the first scroll coil 110 and the heating tube of the second scroll coil 120 are the same, if thin tubes are used, during the long-term heating process, the scroll coil at the rear end of the air inlet direction will be more likely to overburn than the scroll coil at the front end; if thick tubes are used, there will be greater air intake resistance. Specifically, overburning means that when thin tubes are used, the tube diameters are the same, the heating power is evenly distributed, and the heat dissipation conditions of the scroll coil at the rear end of the air inlet direction are worse than those at the front end, and heat accumulates, causing the temperature borne by the heating tube to exceed the limit that it is designed to withstand, resulting in overheating of the heating tube and eventual burning. Increasing the diameter of the heating tube can reduce the surface load (the power shared per unit area on the surface of the heating element), thereby extending the service life, but increasing the diameter of the heating tube will increase the exhaust resistance (at the air inlet), resulting in poor engine exhaust, thereby affecting the engine's power. Therefore, in the present invention, the first scroll tube 110 is positioned closer to the air inlet than the second scroll tube 120, and the diameter of the heating tube of the first scroll tube 110 is smaller than that of the heating tube of the second scroll tube 120. In other words, the first scroll tube 110 is closer to the air inlet and is a thin tube, while the second scroll tube 120 is closer to the air outlet and is a thick tube.

[0030] In one embodiment of the present invention, the diameter ratio of the heating tube of the second scroll coil 120 to the heating tube of the first scroll coil 110 can be 6:5 to 8:5. The absolute diameter of the heating tube of the second scroll coil 120 and the heating tube of the first scroll coil 110 can be 2 mm to 6 mm. This improves product reliability and service life without increasing intake resistance.

[0031] exist Figure 1 and Figure 2 In the illustrated embodiment, a first heating wire (not shown) is provided in the first scroll coil 110, and the first end and the second end of the first heating wire (not shown) are respectively located at the first end and the second end of the first scroll coil 110; a second heating wire (not shown) is provided in the second scroll coil 120, and the first end and the second end of the second heating wire (not shown) are respectively located at the first end and the second end of the second scroll coil 120 (or the second heating tube 122).

[0032] The diameter and length of the heating wire within the vortex coils 110 and 120 essentially determine the length of the current path. To achieve varying power or heating effects, the resistance or structure of the heating wire within the vortex coils 110 and 120 is adjusted to suit different needs. Methods for varying the resistance include modifying the diameter or length of the heating wire; then, the heating resistance is set within the desired range, for example, 150 mΩ to 750 mΩ. Heat resistance is determined by the cross-sectional area and length, and materials with constant resistivity are particularly preferred. Therefore, the length of the vortex coils 110 and 120, and the resulting heating resistance, can be adjusted by the diameter or length of the heating wire.

[0033] exist Figure 1 and Figure 2 In the illustrated embodiment, the vortex coil electric heater for post-treatment catalysis also includes a first electrical connection end 130 and a second electrical connection end 140, wherein the first electrical connection end (e.g., the positive electrode) 130 is electrically connected to the first end of the first heating wire (not shown) provided in the first vortex coil 110, and is also electrically connected to the first end of the second heating wire (not shown) provided in the second vortex coil 120; the second electrical connection end (e.g., the negative electrode) 140 is electrically connected to the second end of the first heating wire (not shown) provided in the first vortex coil 110, and is also electrically connected to the second end of the second heating wire (not shown) provided in the second vortex coil 120.

[0034] exist Figure 1In the embodiment shown, the vortex coil electric heater for post-treatment catalysis also includes an external structural member 150, a cavity 152 is formed in the external structural member 150, and the first vortex coil 110 and the second vortex coil 120 are located in the cavity 152; one end of the cavity 152 is the air inlet of the vortex coil electric heater, and the other end is the air outlet of the vortex coil electric heater; the exhaust gas flows from the air inlet to the air outlet; after the exhaust gas is heated by the vortex coil electric heater, its heat is transferred to the catalyst.

[0035] exist Figure 1 and Figure 2 In the illustrated embodiment, the first electrical connection end 130 includes a first insulating plate 132, a first electrical connection piece 134, and a first terminal (or positive terminal) 136, located outside the external structural member 150. The second electrical connection end 140 includes a second insulating plate 142, a second electrical connection piece 144, and a second terminal (or negative terminal) 146, located outside the external structural member 150. The first insulating plate 132 is sandwiched between a mounting platform 154 of the external structural member 150 and the first electrical connection piece 134. The first terminal 136 is welded to the first electrical connection piece 134. The first end of the first scroll coil 110 is fixed to the mounting platform 154, and the first end of a first heating wire (not shown) disposed within the first scroll coil 110 is electrically connected to the first electrical connection piece 134. The first end of the second scroll coil 120 is fixed to the mounting platform 154, and the first end of a second heating wire (not shown) disposed within the second scroll coil 120 is electrically connected to the first electrical connection piece 134. The second insulating plate 142 is sandwiched between the mounting platform 154 of the external structural member 150 and the second electrical connection plate 144. The second terminal 146 is welded to the second electrical connection plate 144. The second end of the first scroll coil 110 is fixed to the mounting platform 154, and the second end of the first heating wire (not shown) disposed in the first scroll coil 110 is electrically connected to the second electrical connection plate 144. The second end of the second scroll coil 120 is fixed to the mounting platform 154, and the second end of the second heating wire (not shown) disposed in the second scroll coil 120 is electrically connected to the second electrical connection plate 144. In other words, the terminal 136, 146 is welded to the electrical connection plates 134, 144, and the first scroll coil 110 and the second scroll coil 120 are connected in parallel via the electrical connection plates 134, 144. They are fixed to the mounting platform 154 of the external structural member 150 and insulated from the outside world by the insulating plates 132, 142.

[0036] The insulating plate was originally made of ceramic material. During high-temperature welding, local heating would easily cause the ceramic to crack. Therefore, the insulating plates 132 and 142 in the present invention are made of high-temperature resistant phlogopite material. During high-temperature welding, local heating would not cause cracking, thereby avoiding the production of unqualified products and improving product production efficiency.

[0037] It should be noted that in order to facilitate the display of the internal structure of the vortex coil electric heater used for post-processing catalysis, Figure 2 In FIG. 1 , the complete structure of the external structural member 150 is not shown, and only the mounting platform 154 of the external structural member 150 is shown.

[0038] Please refer to Figure 3 As shown, it is a structural diagram of the combination of the first scroll coil and the second scroll coil in one embodiment of the present invention. Figure 1 and Figure 2 The embodiment shown corresponds to the embodiment shown in FIG. Figure 1 、 Figure 2 and Figure 3 In the illustrated embodiment, there is one first scroll coil 110 and one second scroll coil 120, and the central axis direction of the first scroll coil 110 and the central axis direction of the second scroll coil 120 are consistent with the direction from the air inlet to the air outlet; the positive electrode is electrically connected to the first end of a first heating wire (not shown) provided in one first scroll coil 110, and is also electrically connected to the first end of a second heating wire (not shown) provided in one second scroll coil 120; the negative electrode is electrically connected to the second end of the first heating wire (not shown) provided in one first scroll coil 110, and is also electrically connected to the second end of the second heating wire (not shown) provided in one second scroll coil 120; the first scroll coil 110 and the second scroll coil 120 are arranged in sequence along the direction from the air inlet to the air outlet, and the first scroll coil 110 is closer to the air inlet than the second scroll coil 120. Since the diameter of the first scroll tube 110 is smaller than that of the second scroll tube 120, Figure 3 The embodiment shown can be referred to as a two-layer combination of one fine layer and one coarse layer.

[0039] Please refer to Figure 4 As shown, it is a structural diagram of the combination of the first scroll coil and the second scroll coil in another embodiment of the present invention. Figure 4In the embodiment shown, there are two first scroll coils 110 and two second scroll coils 120. The central axis direction of the first scroll coil 110 and the central axis direction of the second scroll coil 120 are consistent with the direction from the air inlet to the air outlet; the positive electrode 1 is electrically connected to the first end of the first heating wire (not shown) provided in one first scroll coil 110, and is also electrically connected to the first end of the second heating wire (not shown) provided in one second scroll coil 120; the positive electrode 2 is electrically connected to the first end of the first heating wire (not shown) provided in the other first scroll coil 110. One end is electrically connected to the first end of the second heating wire (not shown) provided in the other second vortex coil 120; the negative electrode is electrically connected to the second end of the first heating wire (not shown) provided in the two first vortex coils 110, and is also electrically connected to the second end of the second heating wire (not shown) provided in the two second vortex coils 120; the two first vortex coils 110 and the two second vortex coils 120 are arranged in sequence from the air inlet to the air outlet, and the two first vortex coils 110 are closer to the air inlet than the two second vortex coils 120. Since the diameter of the first vortex coil 110 is smaller than that of the second vortex coil 120, Figure 4 The embodiment shown can be referred to as a two-fine, two-coarse, four-layer combination.

[0040] By analogy, the combination of the first scroll coil and the second scroll coil in the present invention can also be a six-layer combination of three thin and three thick layers.

[0041] In summary, the combination of the first scroll tube 110 and the second scroll tube 120 in the present invention can be: the central axis direction of the first scroll tube 110, the central axis direction of the second scroll tube 120 and the direction from the air inlet to the air outlet are consistent; there is one first scroll tube 110 and one second scroll tube 120, and one first scroll tube 110 and one second scroll tube 120 are arranged in sequence along the direction from the air inlet to the air outlet, and one first scroll tube 110 is closer to the air inlet than one second scroll tube 120; or there are multiple first scroll tubes 110 and multiple second scroll tubes 120, and multiple first scroll tubes 110 and multiple second scroll tubes 120 are arranged in sequence along the direction from the air inlet to the air outlet, and multiple first scroll tubes 110 are closer to the air inlet than multiple second scroll tubes 120.

[0042] exist Figure 1 and Figure 2In the illustrated embodiment, the vortex coil electric heater for post-process catalysis further includes heat-conducting fins 160 . These fins 160 are located within the cavity 152 of the external structural member 150 . These fins 160 are closely attached (or closely abut) between each adjacent two layers of the first vortex coil 110 and each adjacent two layers of the second vortex coil 120 . The heat-conducting fins 160 also surround the first and second vortex coils 110, 120 to form a multi-layered vortex structure spaced apart from one another. Alternatively, the heat-conducting fins 160 are clamped between each adjacent two layers of the first vortex coil 110 and each adjacent two layers of the second vortex coil 120 to provide support.

[0043] Fins are typically formed by stamping, but development has shown that this process can easily cause localized thinning and cracking during long-term heating. Therefore, the thermal fins 160 of the present invention can be manufactured by roll forming, resolving this issue. Roll forming of the thermal fins 160 improves production efficiency, avoids defective products, and reduces labor costs.

[0044] The fins originally used a triangular structure. Once they were deformed during assembly, they could not rebound, forming a gap in contact with the heating tube. The heating tube could not transfer heat energy to the heat-conducting fins. Therefore, the heat-conducting fins 160 in this utility model use a wave groove structure. Please refer to Figure 5 As shown, it is a side view of the heat conducting fins in an embodiment of the present invention in an expanded state, please refer to Figure 6 As shown, it is a top view of the heat-conducting fins in one embodiment of the present invention when they are in an unfolded state. Figure 5 and Figure 6 In the illustrated embodiment, the heat-conducting fin 160 has a wave structure, and the heat-conducting fin 160 is provided with grooves 162 at the crests and troughs of the wave structure. The grooves 162 at the crests and troughs of the heat-conducting fin 160 match and contact the heating tube of the first scroll coil 110 or the heating tube of the second scroll coil 120.

[0045] The heat-conducting fins 160 adopt a wave groove structure and have a stress buffer zone. They can rebound in time even if they are deformed by stress during assembly. There is no gap in contact with the heating tubes of the first scroll coil 110 and the second scroll coil 120. The heat energy of the heating tubes can be transferred to the heat-conducting fins 160, avoiding the problem of uneven heat conduction, ensuring its reliability, and improving the service life of the product.

[0046] The front wave of the heat conducting fin 160 serves as the smallest windward surface, and the side grooves serve as support for the vortex coils 110 and 120. The wave shape is not limited to a specific curve function, and the ratio of amplitude to wavelength can be 0.6 to 0.8.

[0047] In one embodiment, the bottom surface and the circumference of the groove 162 are closed; the cross-section of the groove 162 can be semicircular, arc-shaped or V-shaped; the number of grooves 162 is related to the combination of the vortex coils 110 and 120, and can be a combination of one thin and one thick two layers, a combination of two thin and two thick four layers, a combination of three thick and three thin six layers, etc. In other words, the position and number of the grooves 162 are related to the number and number of layers of the first vortex coils 110, and the number and number of layers of the second vortex coils 120.

[0048] The heat conducting fins 160 are made of a high temperature resistant alloy and are in close contact with the scroll coils 110 and 120. When the scroll coils 110 and 120 are powered on and heated, the heat conducting fins 160 also heat up, which greatly increases the heat exchange area.

[0049] In summary, the present invention provides a vortex coil electric heater for post-processing catalysis, which is used in exhaust systems to rapidly heat exhaust gas post-processing components; it is applied in SCR technology (Selective Catalytic Reduction) for exhaust gas recirculation. This design differs from conventional metal flat strip structures in that it incorporates a built-in heating wire structure in the vortex coil, with heat-conducting fins attached to the outer periphery of the coil for gridded small-channel heat exchange to better transfer heat energy to the exhaust gas. The heated exhaust gas then transfers its heat to the catalyst located downstream of the heater along the direction of exhaust flow, allowing the catalyst to quickly reach ignition temperature, thereby ensuring effective treatment of emissions.

[0050] In the present invention, words such as “connect”, “connected”, “connect”, “connected”, etc. indicating electrical connection, unless otherwise specified, indicate direct or indirect electrical connection.

[0051] The above description is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the content disclosed in the present invention should be included in the protection scope recorded in the claims.

Claims

1. A vortex coil electric heater for post-processing catalysis, characterized in that: It includes: One or more first vortex coils, wherein the first vortex coils are a multi-layer vortex coil structure surrounded by a heating tube and spaced apart from each other; One or more second vortex coils, each of which is a multi-layer vortex coil structure surrounded by a heating tube and spaced apart from each other; Wherein, the first scroll coil and the second scroll coil are arranged between the air inlet and the air outlet of the scroll coil electric heater; the first scroll coil is closer to the air inlet than the second scroll coil; The diameter of the heating tube of the first scroll coil is smaller than the diameter of the heating tube of the second scroll coil.

2. The vortex coil electric heater for post-processing catalysis according to claim 1, characterized in that: A first heating wire is provided in the first vortex coil, and a first end and a second end of the first heating wire are respectively located at the first end and the second end of the first vortex coil; A second heating wire is disposed in the second scroll coil, and a first end and a second end of the second heating wire are respectively located at the first end and the second end of the second scroll coil.

3. The vortex coil electric heater for post-processing catalysis according to claim 2, characterized in that: It also includes: a first electrical connection end, electrically connected to the first end of the first heating wire and also electrically connected to the first end of the second heating wire; The second electrical connection end is electrically connected to the second end of the first heating wire and is also electrically connected to the second end of the second heating wire.

4. The vortex coil electric heater for post-processing catalysis according to claim 1, characterized in that: The central axis direction of the first scroll coil, the central axis direction of the second scroll coil and the direction from the air inlet to the air outlet are consistent; There is one first vortex tube and one second vortex tube, and the first vortex tube and the second vortex tube are arranged in sequence along the direction from the air inlet to the air outlet, and the first vortex tube is closer to the air inlet than the second vortex tube; or there are multiple first vortex tubes and multiple second vortex tubes, and the multiple first vortex tubes and the multiple second vortex tubes are arranged in sequence along the direction from the air inlet to the air outlet, and the multiple first vortex tubes are closer to the air inlet than the multiple second vortex tubes.

5. The vortex coil electric heater for post-processing catalysis according to claim 3, characterized in that: It also includes heat conducting fins, The heat conducting fin is closely attached between each two adjacent layers of the scroll structure in the first scroll tube; The heat conducting fin is closely attached between two adjacent layers of the scroll structure in the second scroll coil; The heat conducting fins are also wound along the first scroll coil and the second scroll coil to form a multi-layer scroll structure that is spaced apart from each other.

6. The vortex coil electric heater for post-processing catalysis according to claim 5, characterized in that: The heat conducting fins are of a wave structure; The heat conducting fins are provided with grooves at the crests and troughs of the wave structure; The grooves at the wave crests and wave troughs of the heat-conducting fins match and contact the heating tube of the first scroll coil or the heating tube of the second scroll coil.

7. The vortex coil electric heater for post-processing catalysis according to claim 6, characterized in that: The bottom surface and the peripheral surface of the groove are closed; The cross section of the groove is semicircular, arc-shaped or V-shaped; The position and number of the grooves are related to the number and layers of the first scroll tubes and the number and layers of the second scroll tubes.

8. The vortex coil electric heater for post-processing catalysis according to claim 5, characterized in that: It also includes external structural parts, A cavity is formed in the external structural member, and the first scroll coil, the second scroll coil and the heat conducting fin are located in the cavity; One end of the cavity is the air inlet, and the other end is the air outlet; Exhaust gas flows from the air inlet to the air outlet; After the exhaust gas is heated by the vortex coil electric heater, the heat is transferred to the catalyst.

9. The vortex coil electric heater for post-processing catalysis according to claim 8, characterized in that: The first electrical connection end includes a first insulating plate, a first electrical connection piece and a first terminal located outside the external structural member; The second electrical connection end includes a second insulating plate, a second electrical connection piece and a second terminal located outside the external structural member; The first insulating plate is clamped between the mounting platform of the external structural member and the first electrical connection piece; the first terminal is fixed to the first electrical connection piece by welding; The first end of the first vortex coil is fixed to the mounting platform, and the first end of the first heating wire is electrically connected to the first electrical connection piece; The first end of the second vortex coil is fixed to the mounting platform, and the first end of the second heating wire is electrically connected to the first electrical connection piece; The second insulating plate is clamped between the mounting platform of the external structural member and the second electrical connection piece; The second terminal is welded and fixed to the second electrical connection piece; The second end of the first vortex coil is fixed to the mounting platform, and the second end of the first heating wire is electrically connected to the second electrical connecting piece; The second end of the second vortex coil is fixed to the mounting platform, and the second end of the second heating wire is electrically connected to the second electrical connecting piece.

10. The vortex coil electric heater for post-processing catalysis according to claim 9, characterized in that: The first insulating plate and the second insulating plate are made of phlogopite material; The heat-conducting fins are formed by roll forming; The diameter ratio of the heating tube of the second scroll coil to the heating tube of the first scroll coil is 6:5 to 8:5; The absolute size of the diameters of the heating tube of the second scroll coil and the heating tube of the first scroll coil is 2 mm to 6 mm; and / or The ratio of the amplitude to the wavelength of the wave structure of the heat conducting fin is 0.6 to 0.8.

Images