A safe electric heater and automobile aftertreatment system

Abstract

The present application belongs to the technical field of post-processing, and particularly relates to a safe electric heater and an automobile post-processing system. The safe electric heater comprises a shell, a heat shield, a heating assembly and an elastic member. The outer surface of the shell is provided with the heat shield, the heating assembly is partially arranged in the interior of the shell, the two ends of the heating assembly extend to the exterior of the heat shield, and the two ends are connected with the positive and negative poles of a power supply through wiring terminals. The elastic member is used for ensuring that the wiring terminals are in full contact with the positive and negative wiring terminals. The outer surface of the shell is provided with two pairs of fixed supports which are axially symmetrical. An insulating assembly is arranged between the fixed supports and the wiring terminals. The insulating assembly is used for isolating the wiring terminals from the shell and the fixed supports. The insulating assembly cooperates with a fastener to fix the two ends of the heating assembly on the fixed supports. The peripheral wiring position of the shell of the safe electric heater is designed as an insulating structure. The setting of the insulating assembly and the insulating cover can ensure the safety of electricity use in a high-voltage scenario.

Description

Technical Field

[0001] This invention belongs to the field of after-treatment technology, specifically relating to a safety electric heater and an automotive after-treatment system. Background Technology

[0002] With increasingly stringent regulations on motor vehicle emissions, given the Euro 7 standard's requirements for NO... X With the limits for pollutants such as particulate matter being raised, and in order to align with international requirements, domestic emission requirements will also be tightened in the near future.

[0003] The principles of the General Purpose Particulate Filter (GPF) and Selective Catalytic Reduction (SCR) system seem perfect: they use a honeycomb ceramic structure to intercept carbon particles and NO in the exhaust gas. X Theoretically, this could reduce pollution by 90%. However, in reality, urban commuters bear the brunt of the impact. Since GPFs require high temperatures (around 600°C) to burn carbon deposits for "regeneration," many automakers currently rely on drivers "periodly driving on highways to burn carbon," which undoubtedly increases user costs. Furthermore, diesel engines produce more pollutants during cold starts because SCRs cannot operate efficiently. All of these factors contradict the national emphasis on energy conservation and environmental protection. Therefore, existing GPF and SCR technologies need optimization and improvement.

[0004] Under current technological conditions, installing electric heating devices in the exhaust system has become one of the main research directions for major OEMs and vehicle manufacturers. Electric heating devices can quickly raise the temperature in the exhaust to the ignition temperature of the catalyst, thereby removing carbon deposits inside the GPF and improving the activity of SCR as early as possible.

[0005] To quickly bring the temperature in the exhaust to the ignition temperature of the catalyst, high-voltage electricity needs to be introduced. However, high-voltage electricity poses safety hazards, and ensuring electrical safety in high-voltage scenarios is an urgent problem to be solved. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a safe electric heater and an automotive after-treatment system. The wiring portion of the outer casing of the safe electric heater of this invention is designed with an insulated structure. The use of insulating components and an insulating cover ensures electrical safety in high-voltage scenarios.

[0007] To achieve the above technical objectives, the technical solution adopted in the embodiments of the present invention is as follows: In a first aspect, embodiments of the present invention provide a safety electric heater, including a housing, a heat insulation cover, a heating assembly, and an elastic element; A heat insulation cover is provided on the outer surface of the housing, and the heating component is partially disposed inside the housing. Both ends of the heating component extend to the outside of the heat insulation cover and are connected to the positive and negative terminals of the power supply through wiring terminals. The elastic element is used to ensure that the wiring terminals are in full contact with the positive and negative wiring terminals. The outer surface of the housing is provided with two pairs of axially symmetrical fixing brackets. An insulating component is provided between the fixing bracket and the terminal block. The insulating component is used to isolate the terminal block from the housing and the fixing bracket. The insulating component cooperates with the fastener to fix both ends of the heating component on the fixing bracket.

[0008] Furthermore, the housing has openings at both ends, and a limiting bracket is provided at each of the openings. The limiting bracket is used to position the matching pipeline. An installation space is formed between the limiting bracket and the inner surface of the housing for installing the heating component.

[0009] Furthermore, the heating component has a multi-row serpentine structure, which includes, from the inside out, a conductive heating wire, an insulating component, and a heat dissipation pipe. The heat dissipation pipe is uniformly provided with heat dissipation fins, and the two ends of the conductive heating wire are connected to the terminal block.

[0010] Furthermore, each pair of fixed brackets includes a first support frame and a second support frame, and the wiring terminals connected to both ends of the heating assembly are located between the first support frame and the second support frame. The end of the wiring terminal has a first circular hole, and both the first support frame and the second support frame have a second circular hole. The first circular hole and the second circular hole are coaxially arranged.

[0011] Furthermore, the insulating assembly includes a first insulating tube, a second insulating tube, and a third insulating tube. The third insulating tube is sleeved in the first circular hole of the terminal block. The first and second insulating tubes are sleeved at both ends of the third insulating tube. The first insulating tube is disposed between the terminal block and the first support frame, and the second insulating tube is disposed between the terminal block and the second support frame.

[0012] Furthermore, the fastener includes a locking bolt and a locking nut. One end of the locking bolt is located outside the first support frame, and the other end passes through the third insulating tube. The locking nut is located outside the second support frame and is threadedly connected to the locking bolt.

[0013] Furthermore, the elastic elements are respectively disposed between the wiring terminal and the first insulating tube and between the wiring terminal and the second insulating tube.

[0014] Furthermore, the housing is also provided with an insulating cover, which can cover the fixing bracket and the insulating components. The insulating cover has an elongated groove for the power supply terminal to be connected.

[0015] Secondly, embodiments of the present invention provide an automotive aftertreatment system, including the safety electric heater described in the first aspect, wherein the safety electric heater is disposed between the DOC component and the SCR component or between the three-way catalytic converter and the gasoline particulate filter.

[0016] The beneficial effects of the technical solution provided by the embodiments of the present invention are as follows: 1. The wiring portion of the outer casing of the safety electric heater of this invention is designed with an insulated structure. The insulated components and insulating cover ensure electrical safety in high-voltage scenarios. A locking bolt is inserted into the circular hole of the third insulating tube, while the first and second insulating tubes are together fitted around the outer ring of the third insulating tube, ensuring complete insulation between the wiring terminals and the casing. The insulating cover covers the fixing bracket and the insulating components, and has a long slot on it for the power wiring terminals to connect.

[0017] 2. The heating component of the safety electric heater of the present invention has a multi-row serpentine structure and is arranged in a 3D three-dimensional manner, which makes full use of space and allows for full contact with the surrounding air, while ensuring that the back pressure does not increase significantly. In addition, the heat dissipation fins designed on the heating component can prevent heat from being too concentrated, increase service life, and increase the heating area for better heat dissipation.

[0018] 3. The safety electric heater of the present invention has elastic elements between the wiring terminal and the first insulating tube and between the wiring terminal and the second insulating tube. The elastic elements can ensure that the wiring terminal and the positive and negative wiring terminals are in full contact, so as to ensure that when the fastener is loaded, a certain pre-tightening force is given between the wiring terminals to prevent poor contact. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the safety electric heater in an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the exploded structure of the safety electric heater in an embodiment of the present invention.

[0021] Figure 3 This is a cross-sectional view of the safety electric heater in the passenger vehicle after-treatment system according to an embodiment of the present invention.

[0022] Figure 4 This is a cross-sectional view of the safety electric heater in the commercial vehicle aftertreatment system according to an embodiment of the present invention.

[0023] Figure 5 A cross-sectional view of the safety electric heater in an embodiment of the present invention.

[0024] Figure 6 yes Figure 1 A schematic diagram of the heating component in a safety electric heater.

[0025] Explanation of reference numerals in the attached drawings: 1-Narrow heat insulation cover; 2-Wide heat insulation cotton; 3-Narrow heat insulation cotton; 4-Heating component; 5-Housing shell; 6-Locking bolt; 7-First insulating pipe; 8-Terminal; 9-Insulating cover; 10-Second insulating pipe; 11-Locking nut; 12-Third insulating pipe; 13-Limiting bracket; 14-Wide heat insulation cover; 15-Fixed bracket; 16-Elastic element; 41-Heat dissipation fins; 81-First round hole; 150-Second round hole; 151-First support frame; 152-Second support frame. Detailed Implementation

[0026] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "inner" and "outer", "upper" and "lower", "left" and "right" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention.

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0028] Example 1 like Figure 1-5 As shown, a safety electric heater includes a housing 5, a heat insulation cover, a heating component 4, and an elastic element 16; The housing 5 has openings at both ends, and a limiting bracket 13 is connected to each of the openings. The limiting bracket 13 is 5-10mm away from the opening of the housing 5. The limiting bracket 13 is used to position the matching pipeline. An installation space is formed between the limiting bracket 13 and the inner surface of the housing 5 for installing the heating component 4.

[0029] A heat insulation cover is provided on the outer surface of the housing 5. The heating component 4 is partially installed in the installation space inside the housing 5. Both ends of the heating component 4 extend to the outside of the heat insulation cover through the slots on the housing 5 and are connected to the positive and negative poles of the power supply through the wiring terminals 8.

[0030] The outer surface of the housing 5 is provided with two pairs of axially symmetrical fixed brackets 15. An insulating component is provided between the fixed brackets 15 and the terminal 8. The insulating component is used to isolate the terminal 8 from the housing 5 and the fixed brackets 15. The insulating component cooperates with the fastener to fix the two ends of the heating component 4 on the fixed brackets 15.

[0031] As one implementation method, such as Figure 6 As shown, the heating component 4 has a multi-row serpentine structure, which includes, from the inside out, a conductive heating wire, an insulating component, and a heat dissipation pipe. Heat dissipation fins 41 are evenly distributed on the heat dissipation pipe. The two ends of the conductive heating wire are connected to terminals 8. Terminals 8 do not contact the external heat dissipation pipe; they are isolated by the insulating component. The gap between the heat dissipation pipe and the slot in the housing 5 is completely welded in place.

[0032] In one implementation, the insulating component is made of ceramic and the heat dissipation pipe is made of alloy. The insulating component and the heat dissipation pipe can position the conductive heating wire, so that the entire heating assembly 4 can maintain a 3D three-dimensional state.

[0033] In one implementation, the two ends of the heat dissipation pipe in the heating component 4 are welded to the housing 5. It is understood that, as needed, several connecting brackets can be set between the heating component 4 and the housing 5 to support the weight of the heating component 4. This will not be elaborated here. The connecting brackets are hidden in the figure for clarity.

[0034] The heating component 4 is arranged in a 3D three-dimensional structure, which can make great use of space and ensure that the heating component is in full contact with the surrounding air, while ensuring that the back pressure does not increase significantly. In addition, the heat dissipation fins on the heating component 4 can prevent heat from being too concentrated, increase service life, and increase the heating area for better heat dissipation.

[0035] In one embodiment, each pair of fixed brackets 15 includes a first support frame 151 and a second support frame 152. The wiring terminals 8 connected to both ends of the heating component 4 are located between the first support frame 151 and the second support frame 152. The end of the wiring terminal 8 has a first circular hole 81. The first support frame 151 and the second support frame 152 both have a second circular hole 150. The first circular hole 81 and the second circular hole 150 are coaxially arranged. The coaxial arrangement facilitates the fasteners to fix the heating component 4 on the fixed bracket 15.

[0036] The insulation assembly includes a first insulating tube 7, a second insulating tube 10, and a third insulating tube 12. The third insulating tube 12 is sleeved in the first circular hole 81 of the terminal 8. The first insulating tube 7 and the second insulating tube 10 are sleeved at both ends of the third insulating tube 12. The first insulating tube 7 is disposed between the terminal 8 and the first support frame 151, and the second insulating tube 10 is disposed between the terminal 8 and the second support frame 152.

[0037] In one embodiment, the first insulating tube 7, the second insulating tube 10, and the third insulating tube 12 are all ceramic tubes.

[0038] The fasteners include a locking bolt 6 and a locking nut 11. One end of the locking bolt 6 is located on the outside of the first support frame 151, and the other end is installed through the third insulating tube 12. The locking nut 11 is located on the outside of the second support frame 152 and is threadedly connected to the locking bolt 6.

[0039] Elastic elements 16 are respectively disposed between the terminal 8 and the first insulating tube 7, and between the terminal 8 and the second insulating tube 10. The elastic elements 16 are used to ensure that the terminal 8 has full contact with the positive and negative terminals. After the locking bolt 6 is inserted into the inner round hole of the third insulating tube 12, the locking nut 11 is tightened. The first support frame 151 and the second support frame 152 are subjected to force, which is transmitted to the elastic elements 16, thereby ensuring that the terminal 8 has full contact with the positive and negative terminals. After tightening, the threads are spot welded to prevent the threads from loosening.

[0040] In one implementation, the elastic element 16 is a spring sheet.

[0041] In one embodiment, the heat insulation cover includes a narrow heat insulation cover 1 and a wide heat insulation cover 14. A narrow heat insulation cotton 3 is disposed between the narrow heat insulation cover 1 and the housing 5, and a wide heat insulation cotton 2 is disposed between the wide heat insulation cover 14 and the housing 5. The narrow heat insulation cover 1 and the wide heat insulation cover 14 are welded to the housing 5. The narrow heat insulation cover 1 is provided with a slot for the fixing bracket 15 to pass through. The heat insulation cover and heat insulation cotton can improve the thermal efficiency of the heater while reducing the thermal impact on other electrical components of the vehicle chassis.

[0042] The housing 5 is also provided with an insulating cover 9, which can cover the fixing bracket 15 and the insulating components. The insulating cover 9 has a long groove 91 for the power supply terminal to be connected.

[0043] The high-voltage electric heater of the automotive aftertreatment system of the present invention is located between the DOC component and the SCR component (commercial vehicle aftertreatment system) or between the three-way catalytic converter (TWC) and the gasoline particulate filter (GPF) (passenger vehicle aftertreatment system). After the system is powered on, the current flows from the positive electrode to the negative electrode, and the heating wire inside the heating component 4 is instantly energized and heated. Due to the 3D three-dimensional structure of the heating component 4, the space is fully utilized to make full contact with the surrounding air, while ensuring that the back pressure does not increase significantly. In addition, the heat dissipation fins 41 designed on the heating component 4 can prevent the heat of the heating tube from being too concentrated, increase the service life, and at the same time increase the heating area for better heat dissipation.

[0044] Insulation components are installed at the wiring locations on the outer perimeter of the housing 5 to ensure electrical safety in high-voltage scenarios. After the locking bolt 6 is inserted into the inner circular hole of the third insulating tube 12, the first insulating tube 7 and the second insulating tube 10 are simultaneously fitted onto the outer ring of the third insulating tube 12 to ensure that the wiring terminal 8 is completely insulated from the housing 5.

[0045] When connecting the power cord to the electric heater, the power supply terminals and the electric heater terminals 8 should be aligned coaxially. After the locking bolt 6 is inserted into the third insulating tube 12, the bolt assembly is inserted into the second round hole 150 of the fixing bracket 15. At the same time, the first insulating tube 7 and the second insulating tube 10 are installed from the inside of the fixing bracket 15, distributed on both sides of the terminals. The bolt assembly is inserted into the inner holes of the first insulating tube 7 and the second insulating tube 10. In addition, to ensure that the terminals do not loosen, elastic elements 16 should be installed on both sides of the terminals to ensure that a certain preload is applied between the terminals when the locking nut 11 applies a load, preventing poor contact.

[0046] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A safe electric heater, characterized in that, Includes a housing (5), a heat shield, a heating assembly (4), and an elastic element (16); The outer surface of the housing (5) is provided with a heat insulation cover. The heating component (4) is partially disposed inside the housing (5). Both ends of the heating component (4) extend to the outside of the heat insulation cover and are connected to the positive and negative poles of the power supply through the wiring terminals (8). The elastic element (16) is used to ensure that the wiring terminals (8) are in full contact with the wiring terminals of the positive and negative poles of the power supply. The outer surface of the housing (5) is provided with two pairs of axially symmetrical fixed brackets (15). An insulating component is provided between the fixed bracket (15) and the terminal (8). The insulating component is used to isolate the terminal (8) from the housing (5) and the fixed bracket (15). The insulating component cooperates with the fastener to fix the two ends of the heating component (4) on the fixed bracket (15).

2. The safety electric heater according to claim 1, characterized in that, The shell (5) has openings at both ends, and a limiting bracket (13) is provided at each of the openings. The limiting bracket (13) is used to position the matching pipeline. The limiting bracket (13) forms an installation space with the inner surface of the housing (5) for installing the heating component (4).

3. The safety electric heater according to claim 1, characterized in that, The heating component (4) has a multi-row serpentine structure, which includes a conductive heating wire, an insulating component and a heat dissipation pipe from the inside to the outside. Heat dissipation fins (41) are evenly arranged on the heat dissipation pipe, and the two ends of the conductive heating wire are connected to the terminal block (8).

4. The safety electric heater according to claim 1, characterized in that, Each pair of fixed brackets (15) includes a first support frame (151) and a second support frame (152). The terminal block (8) connected to both ends of the heating assembly (4) is located between the first support frame (151) and the second support frame (152). The end of the terminal block (8) has a first circular hole (81). Both the first support frame (151) and the second support frame (152) have a second circular hole (150). The first circular hole (81) and the second circular hole (150) are coaxially arranged.

5. The safety electric heater according to claim 4, characterized in that, The insulating assembly includes a first insulating tube (7), a second insulating tube (10), and a third insulating tube (12). The third insulating tube (12) is sleeved in the first circular hole (81) of the terminal (8). The first insulating tube (7) and the second insulating tube (10) are sleeved at both ends of the third insulating tube (12). The first insulating tube (7) is disposed between the terminal (8) and the first support frame (151), and the second insulating tube (10) is disposed between the terminal (8) and the second support frame (152).

6. The safety electric heater according to claim 5, characterized in that, The fasteners include a locking bolt (6) and a locking nut (11). One end of the locking bolt (6) is located outside the first support frame (151), and the other end is disposed through the third insulating tube (12). The locking nut (11) is disposed outside the second support frame (152) and is threadedly connected to the locking bolt (6).

7. The safety electric heater according to claim 5 or 6, characterized in that, The elastic element (16) is respectively disposed between the terminal (8) and the first insulating tube (7) and between the terminal (8) and the second insulating tube (10).

8. The safety electric heater according to claim 1, characterized in that, An insulating cover (9) is also provided on the housing (5). The insulating cover (9) can cover the fixed bracket (15) and the insulating components. The insulating cover (9) has a long groove (91) for the power supply terminal to be connected.

9. An automotive after-treatment system, characterized in that, Includes the safety electric heater as described in claim 9, wherein the safety electric heater is disposed between the DOC assembly and the SCR assembly or between the three-way catalytic converter and the gasoline particulate filter.

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