Exhaust gas heating device and vehicle

Abstract

The utility model discloses a tail gas heating device and vehicle, tail gas heating device includes: casing, and the first gas flow channel and the second gas flow channel of spacing are formed in casing, and the first gas flow channel and the second gas flow channel extend along the axis direction of casing and run through casing, heating piece, heating piece is located in the first gas flow channel, switch subassembly, switch subassembly is used to open or close the first gas flow channel and open or close the second gas flow channel. According to the tail gas heating device of the utility model, on the one hand, since the time of tail gas in the first gas flow channel is very short, thereby reduce the damage to heating piece, improve the service life of heating piece. On the other hand, since the damage that heating piece receives is less, can reduce the cross -sectional area of heating piece to improve the resistance value of heating piece, thereby improve the heating power, improve the heating efficiency to tail gas.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and in particular to an exhaust gas heating device and a vehicle. Background Technology

[0002] Exhaust gas heating devices are commonly used to heat exhaust gases during cold starts. In currently available technologies, electric heaters need to withstand the purging and corrosion of high-temperature (400-800℃), high-pressure (50-150KPa), and corrosive automotive exhaust gases. On the one hand, this reduces the service life of the electric heater. On the other hand, to appropriately improve the service life of the electric heater, the cross-sectional area of ​​the resistor is generally increased, for example, by using a thinner and wider metal foil strip as the heating element. However, as the cross-sectional area of ​​the resistor increases, the resistance value decreases, the heating power is low (total power is around 3kW), and the heating efficiency of the exhaust gas is low. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an exhaust gas heating device that, on the one hand, reduces damage to the heating element, and on the other hand, increases the heating power of the heating element, thereby improving the heating efficiency of the exhaust gas.

[0004] This utility model also proposes a vehicle that includes the aforementioned exhaust gas heating device.

[0005] The exhaust gas heating device according to an embodiment of the present invention includes: a housing, wherein a first gas flow channel and a second gas flow channel are formed therein, the first gas flow channel and the second gas flow channel extending along the axial direction of the housing and penetrating the housing; a heating element disposed in the first gas flow channel; and a switching assembly for opening or closing the first gas flow channel and opening or closing the second gas flow channel.

[0006] According to an embodiment of the present invention, the exhaust gas heating device comprises a first gas flow channel and a second gas flow channel formed separately within a housing. The first and second gas flow channels extend along the axial direction of the housing and penetrate the housing. A heating element is disposed within the first gas flow channel. A switching assembly is used to open or close the first gas flow channel and the second gas flow channel. When exhaust gas needs to be heated, the switching assembly opens the first gas flow channel and simultaneously closes the second gas flow channel, allowing the exhaust gas to enter the first gas flow channel for heating. When exhaust gas heating is not required, the switching assembly closes the first gas flow channel and opens the second gas flow channel, allowing the exhaust gas to enter the second gas flow channel, thus preventing the exhaust gas from contacting the heating element within the first gas flow channel. On one hand, because the exhaust gas spends a very short time in the first gas flow channel, damage to the heating element is reduced, increasing its service life. On the other hand, because the heating element suffers less damage, its cross-sectional area can be reduced to increase its resistance value, thereby increasing the heating power and improving the heating efficiency of the exhaust gas.

[0007] In some embodiments of this utility model, the ratio of the cross-sectional area of ​​the first gas flow channel perpendicular to the axial direction of the housing to the cross-sectional area of ​​the second gas flow channel perpendicular to the axial direction of the housing is 1-7.

[0008] In some embodiments of this invention, the switching assembly closes the second gas channel when the first gas channel is opened, and opens the second gas channel when the first gas channel is closed.

[0009] In some embodiments of this utility model, the switch assembly includes: a switch structure, which is a single and movable switch structure, used to open the first gas flow channel and close the second gas flow channel, or close the first gas flow channel and open the second gas flow channel; and a drive assembly used to drive the switch structure to move.

[0010] In some embodiments of this utility model, the switching assembly includes: a first switching mechanism and a second switching mechanism, wherein the first switching mechanism is movable and used to open or close the first gas flow channel, and the second switching mechanism is movable and used to open or close the second gas flow channel; and a driving assembly, wherein the driving assembly is used to drive the first switching mechanism and the second switching mechanism to move.

[0011] In some embodiments of this utility model, the driving component is one and simultaneously drives the first switching mechanism and the second switching mechanism to move; or, the driving component is two, and the two driving components respectively drive the first switching mechanism and the second switching mechanism to move.

[0012] In some embodiments of this utility model, the first gas flow channel is arranged around the second gas flow channel, and the axis of the first gas flow channel coincides with the axis of the second gas flow channel; or, the second gas flow channel is arranged around the first gas flow channel, and the axis of the first gas flow channel coincides with the axis of the second gas flow channel; or, the first gas flow channel and the second gas flow channel are arranged in the circumferential direction of the housing; or, there are multiple first gas flow channels and multiple second gas flow channels, and the multiple first gas flow channels and the multiple second gas flow channels are alternately arranged in the circumferential direction of the housing.

[0013] In some embodiments of this utility model, the exhaust gas heating device further includes a positioning component, which is disposed in the first gas flow channel and connected to the heating element, for fixing the heating element.

[0014] In some embodiments of this utility model, a partition is provided inside the housing, which divides the space inside the housing into a first gas flow channel and a second gas flow channel.

[0015] In some embodiments of this utility model, the first gas flow channel is arranged around the second gas flow channel, and the door opening and closing assembly includes: a first switching mechanism and a second switching mechanism, wherein the first switching mechanism is movable to open or close the first gas flow channel, and the second switching mechanism is movable to open or close the second gas flow channel; and a driving assembly for driving the first switching mechanism and the second switching mechanism to move.

[0016] In some embodiments of this utility model, the driving assembly includes: a driving motor, which is fixed relative to the housing; a first swing arm, which is connected to the output shaft of the driving motor and to the first switching mechanism, for driving the first switching mechanism to open or close the first gas flow channel; and a second swing arm, which is connected to the output shaft of the driving motor and to the second switching mechanism, for driving the second switching mechanism to open or close the second gas flow channel.

[0017] In some embodiments of this utility model, the first switching mechanism is an iris mechanism; and / or, the second switching mechanism is an iris mechanism.

[0018] In some embodiments of this utility model, the exhaust gas heating device further includes: a positioning component, which is disposed in the first gas flow channel and connected to the heating element for fixing the heating element, and the positioning component is connected to the inner peripheral wall of the housing and the partition.

[0019] In some embodiments of this utility model, the positioning component includes: a first support member disposed on one side of the heating member along the axial direction of the housing, the first support member extending along the circumferential direction of the housing and connected to the heating member; and a second support member extending along the radial direction of the housing and connected to the first support member, one end of the second support member in the length direction being connected to the partition plate, and the other end being connected to the inner peripheral wall of the housing.

[0020] In some embodiments of this utility model, the positioning component further includes: a positioning post, which extends along the axial direction of the housing, one end of the positioning post in the length direction is connected to the second support member, and the outer peripheral wall of the positioning post is connected to the heating member.

[0021] In some embodiments of this utility model, the positioning post includes: a support pin, which is connected to the first support member; a buffer layer, which is sleeved on the support pin and connected to the support pin; an insulating layer, which is sleeved on the buffer layer and connected to the buffer layer; and a connecting layer, which is sleeved on the insulating layer and connected to the insulating layer, and the connecting layer is adapted to be connected to the heating member.

[0022] In some embodiments of this utility model, the positioning component further includes: a third support member, which extends radially along the housing, with one end of the third support member connected to the partition plate and the other end connected to the heating element.

[0023] In some embodiments of this utility model, the length of the third support member is greater than or equal to 5 mm.

[0024] In some embodiments of this utility model, the positioning component further includes a fourth support member, which is disposed between the inner peripheral wall of the housing and the heating element, and is connected to both the inner peripheral wall of the housing and the heating element.

[0025] The vehicle according to an embodiment of the present invention includes: an engine; a three-way catalytic converter; and the aforementioned exhaust gas heating device, wherein the exhaust gas heating device is disposed between the exhaust port of the engine and the intake port of the three-way catalytic converter.

[0026] According to the vehicle embodiment of this utility model, by providing the above-mentioned exhaust gas heating device, a first gas flow channel and a second gas flow channel are formed separately within the housing. The first gas flow channel and the second gas flow channel extend along the axial direction of the housing and penetrate the housing. A heating element is disposed within the first gas flow channel. A switching assembly is used to open or close the first gas flow channel and the second gas flow channel. When exhaust gas needs to be heated, the switching assembly opens the first gas flow channel and simultaneously closes the second gas flow channel, allowing the exhaust gas to enter the first gas flow channel for heating. When exhaust gas heating is not required, the switching assembly closes the first gas flow channel and opens the second gas flow channel, allowing the exhaust gas to enter the second gas flow channel, thus preventing the exhaust gas from contacting the heating element within the first gas flow channel. On the one hand, since the exhaust gas spends a very short time in the first gas flow channel, damage to the heating element is reduced, and the service life of the heating element is improved. On the other hand, since the heating element suffers less damage, the cross-sectional area of ​​the heating element can be reduced to increase the resistance value of the heating element, thereby increasing the heating power and improving the heating efficiency of the exhaust gas.

[0027] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0029] Figure 1 This is a perspective view of the exhaust gas heating device according to Embodiment 1 of the present utility model, wherein a first gas flow channel is arranged around a second gas flow channel, and a switch assembly is not shown.

[0030] Figure 2 This is a top view of the exhaust gas heating device according to Embodiment 1 of the present utility model, wherein the switch assembly is not shown;

[0031] Figure 3 This is a perspective view of the exhaust gas heating device according to Embodiment 1 of the present utility model, wherein the first gas flow channel is closed and the second gas flow channel is open;

[0032] Figure 4 This is a perspective view of the exhaust gas heating device according to Embodiment 1 of the present utility model, wherein the first gas flow channel is closed and the second gas flow channel is open.

[0033] Figure 5 This is a perspective view of the exhaust gas heating device according to Embodiment 1 of the present utility model, wherein the second gas flow channel is closed and the first gas flow channel is open;

[0034] Figure 6This is a top view of the exhaust gas heating device according to Embodiment 2 of the present utility model, wherein the second gas flow channel is arranged around the first gas flow channel;

[0035] Figure 7 This is a top view of the exhaust gas heating device according to Embodiment 3 of the present utility model, wherein it shows that there are multiple first gas channels and multiple second gas channels, and the multiple first gas channels and multiple second gas channels are arranged alternately in the circumferential direction of the shell.

[0036] Figure 8 This is a top view of the exhaust gas heating device according to Embodiment 4 of the present utility model, wherein the first gas flow channel and the second gas flow channel are arranged in the circumferential direction of the shell.

[0037] Figure 9 This is a cross-sectional view of the third support member of the exhaust gas heating device according to Embodiment 1 of this utility model;

[0038] Figure 10 This is a cross-sectional view of the positioning column of the exhaust gas heating device according to Embodiment 1 of this utility model;

[0039] Figure 11 This is a schematic diagram of a vehicle according to an embodiment of the present utility model.

[0040] Figure label:

[0041] 100. Vehicles;

[0042] 10. Exhaust gas heating device;

[0043] 1. Housing; 11. First gas flow channel; 12. Second gas flow channel; 13. Terminal;

[0044] 2. Heating element;

[0045] 3. Switch assembly; 31. First switch mechanism; 311. First iris flap; 312. First fixed plate; 313. First rotating plate; 314. First slide groove; 32. Second switch mechanism; 321. Second iris flap; 33. Drive assembly; 331. Drive motor; 332. First swing arm; 333. Second swing arm;

[0046] 4. Positioning component; 41. First support member; 42. Second support member; 43. Positioning post; 431. Support pin; 432. Buffer layer; 433. Insulating layer; 434. Connecting layer; 44. Third support member; 441. First insulating part; 442. First connecting part; 45. Fourth support member;

[0047] 5. Partition;

[0048] 20. Engine;

[0049] 30. Three-way catalytic converter;

[0050] 40. Power supply. Detailed Implementation

[0051] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0052] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and 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 of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0053] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0054] The following is for reference. Figures 1-11 Description of exhaust gas heating device 10 according to an embodiment of the present utility model.

[0055] like Figures 1-8 As shown, the exhaust gas heating device 10 according to an embodiment of the present invention includes: a housing 1, a heating element 2, and a switching assembly 3.

[0056] Specifically, refer to Figures 1-8The housing 1 has a first gas flow channel 11 and a second gas flow channel 12 that are spaced apart. The first gas flow channel 11 and the second gas flow channel 12 extend along the axial direction of the housing 1 and penetrate the housing 1. The heating element 2 is disposed in the first gas flow channel 11. The switch assembly 3 is used to open or close the first gas flow channel 11 and to open or close the second gas flow channel 12.

[0057] It should be noted that the housing 1 also has two terminals 13, one of which is a positive terminal 13 and the other is a negative terminal 13. One end of the heating element 2 is connected to the positive terminal 13 and the other end is connected to the negative terminal 13. The positive terminal 13 and the negative terminal 13 are respectively connected to the vehicle 100 power supply 40, such as the vehicle-mounted high-voltage power platform in this utility model, so as to realize the power input of the heating element 2 and realize the heating of the exhaust gas.

[0058] Meanwhile, electrical insulation between the terminal 13 and the housing 1 is achieved as follows: the housing 1 has a terminal hole, and the terminal 13 passes through the terminal hole. The diameter of the terminal 13 is smaller than the inner diameter of the terminal hole, that is, there is a gap between the two. The value of this gap is 2-8mm. Electrical insulation is achieved by filling this gap with ceramic powder, such as magnesium oxide powder, aluminum oxide powder, etc.

[0059] Understandably, when exhaust gas needs to be heated, the switch assembly 3 opens the first gas flow channel 11 and simultaneously closes the second gas flow channel 12, allowing exhaust gas to enter only the first gas flow channel 11. At this time, the heating element 2 operates to heat the exhaust gas. When exhaust gas heating is not required, the switch assembly 3 closes the first gas flow channel 11 and opens the second gas flow channel 12, allowing exhaust gas to enter only the second gas flow channel 12. This prevents the exhaust gas from contacting the heating element 2 within the first gas flow channel 11. On one hand, because the exhaust gas is heated for a very short time—for example, 20-30 seconds in this invention—damage to the heating element 2 is reduced, increasing its service life. On the other hand, because the heating element 2 suffers less damage, its cross-sectional area can be reduced to increase its resistance, allowing for access to high-voltage platforms and higher heating power, such as 220V and 6kW heating power, thereby increasing the heating power and improving the heating efficiency of the exhaust gas.

[0060] In addition, a temperature detector can be installed upstream of the exhaust gas heating device 10 along the direction of exhaust gas flow to determine whether exhaust gas heating is required. Meanwhile, the heating element 2 in this invention can be made of metal wire or flat metal wire with high resistivity, narrow width, or small cross-sectional area.

[0061] It should be noted that the switch assembly 3 is used to open or close the inlet of the first gas flow channel 11 and to open or close the inlet or outlet of the second gas flow channel 12. Therefore, when it is not necessary to heat the exhaust gas, the switch assembly 3 can prevent the exhaust gas from entering the first gas flow channel 11 when it closes the first gas flow channel 11.

[0062] According to the exhaust gas heating device 10 of this utility model embodiment, a first gas flow channel 11 and a second gas flow channel 12 are formed separately within the housing 1. The first gas flow channel 11 and the second gas flow channel 12 extend along the axial direction of the housing 1 and penetrate the housing 1. A heating element 2 is disposed within the first gas flow channel 11. A switch assembly 3 is used to open or close the first gas flow channel 11 and the second gas flow channel 12. When it is necessary to heat the exhaust gas, the switch assembly 3 opens the first gas flow channel 11 and closes the second gas flow channel 12 at the same time, so that the exhaust gas enters the first gas flow channel 11 to heat the exhaust gas. When it is not necessary to heat the exhaust gas, the switch assembly 3 closes the first gas flow channel 11 and opens the second gas flow channel 12, so that the exhaust gas enters the second gas flow channel 12, avoiding contact between the exhaust gas and the heating element 2 within the first gas flow channel 11. On the one hand, since the exhaust gas spends a very short time in the first gas flow channel 11, damage to the heating element 2 is reduced, and the service life of the heating element 2 is improved. On the other hand, since the heating element 2 is less damaged, the cross-sectional area of ​​the heating element 2 can be reduced to increase the resistance value of the heating element 2, thereby increasing the heating power and improving the heating efficiency of the exhaust gas.

[0063] In some embodiments of this invention, the ratio of the cross-sectional area of ​​the first gas flow channel 11 perpendicular to the axis of the housing 1 to the cross-sectional area of ​​the second gas flow channel 12 perpendicular to the axis of the housing 1 is 1-7. For example, the ratio of the cross-sectional area of ​​the first gas flow channel 11 perpendicular to the axis of the housing 1 to the cross-sectional area of ​​the second gas flow channel 12 perpendicular to the axis of the housing 1 is 1, 2, 2.5, or 7, etc. This ensures that the exhaust gas back pressure is not affected while also ensuring that the exhaust gas can be effectively heated.

[0064] In some embodiments of this utility model, such as Figures 3-5As shown, when the first gas flow channel 11 is opened, the second gas flow channel 12 is closed; when the first gas flow channel 11 is closed, the second gas flow channel 12 is opened. Therefore, when it is necessary to heat the exhaust gas, the switch assembly 3 opens the first gas flow channel 11 and simultaneously closes the second gas flow channel 12, allowing the exhaust gas to enter only the first gas flow channel 11. At this time, the heating element 2 operates to heat the exhaust gas. When it is not necessary to heat the exhaust gas, the switch assembly 3 closes the first gas flow channel 11 and opens the second gas flow channel 12, allowing the exhaust gas to enter only the second gas flow channel 12. This prevents the exhaust gas from contacting the heating element 2 within the first gas flow channel 11. Furthermore, since the heating time of the exhaust gas is very short—that is, the time the exhaust gas spends within the first gas flow channel 11 is very short, for example, 20-30 seconds in this invention—damage to the heating element 2 is reduced, and the service life of the heating element 2 is improved. On the other hand, since the heating element 2 is less damaged, the cross-sectional area of ​​the heating element 2 can be reduced to increase the resistance value of the heating element 2, so as to adapt to the access of high voltage platforms and higher heating power, such as 220V voltage and 6kW heating power, thereby increasing the heating power and improving the heating efficiency of exhaust gas.

[0065] In some embodiments of this utility model, the switch assembly 3 includes a switch structure and a drive assembly 33. The switch structure is single and movable, used to open the first gas flow channel 11 and close the second gas flow channel 12, or close the first gas flow channel 11 and open the second gas flow channel 12. The drive assembly 33 is used to drive the switch structure to move. It is understood that a single switch structure can simultaneously achieve opening the first gas flow channel 11 while closing the second gas flow channel 12, and closing the first gas flow channel 11 while opening the second gas flow channel 12, simplifying the structure and saving costs. The switch structure can be a valve, an iris recognition mechanism, etc.

[0066] When it is necessary to heat the exhaust gas, the drive assembly 33 drives the switch structure to open the first gas flow channel 11 and close the second gas flow channel 12 at the same time, so that the exhaust gas can only enter the first gas flow channel 11. At this time, the heating element 2 works to heat the exhaust gas. When it is not necessary to heat the exhaust gas, the drive assembly 33 drives the switch structure to close the first gas flow channel 11 and open the second gas flow channel 12, so that the exhaust gas can only enter the second gas flow channel 12, thereby preventing the exhaust gas from contacting the heating element 2 in the first gas flow channel 11.

[0067] In some embodiments of this utility model, such as Figures 3-5As shown, the switch assembly 3 includes: a first switch mechanism 31, a second switch mechanism 32, and a drive assembly 33. The first switch mechanism 31 is movable and is used to open or close the first gas flow channel 11. The second switch mechanism 32 is movable and is used to open or close the second gas flow channel 12. The drive assembly 33 is used to drive the first switch mechanism 31 and the second switch mechanism 32 to move.

[0068] It is understandable that by controlling the opening and closing of the first gas flow channel 11 and the second gas flow channel 12 through the first switching mechanism 31 and the second switching mechanism 32 respectively, the opening and closing of the first gas flow channel 11 and the second gas flow channel 12 can operate independently, making the opening and closing of the first gas flow channel 11 and the second gas flow channel 12 more stable and reliable.

[0069] When it is necessary to heat the exhaust gas, the drive assembly 33 drives the first switch mechanism 31 to open the first gas flow channel 11, and at the same time drives the second switch mechanism 32 to close the second gas flow channel 12, so that the exhaust gas can only enter the first gas flow channel 11. At this time, the heating element 2 works to heat the exhaust gas. When it is not necessary to heat the exhaust gas, the drive assembly 33 drives the first switch mechanism 31 to close the first gas flow channel 11, and at the same time drives the second switch mechanism 32 to open the second gas flow channel 12, so that the exhaust gas can only enter the second gas flow channel 12, thereby preventing the exhaust gas from contacting the heating element 2 in the first gas flow channel 11.

[0070] In some embodiments of this utility model, such as Figures 3-5 As shown, the drive component 33 is one and simultaneously drives the first switch mechanism 31 and the second switch mechanism 32 to move; thus, by using one drive component 33 to simultaneously drive the first switch mechanism 31 and the second switch mechanism 32 to move, on the one hand, the setting of the drive component 33 is saved, making the structure simple and saving costs.

[0071] Alternatively, there may be two drive components 33, which drive the first switching mechanism 31 and the second switching mechanism 32 respectively. Therefore, when independent control of the first switching mechanism 31 and the second switching mechanism 32 is required, two drive components 33 can be used to drive them separately, thereby achieving a more flexible control method and improving the system's adaptability and reliability.

[0072] In some embodiments of this utility model, such as Figures 1-5 As shown, the first gas flow channel 11 is arranged around the second gas flow channel 12, and the axis of the first gas flow channel 11 coincides with the axis of the second gas flow channel 12.

[0073] Or, such as Figure 6 As shown, the second gas flow channel 12 is arranged around the first gas flow channel 11, and the axis of the first gas flow channel 11 coincides with the axis of the second gas flow channel 12.

[0074] Or, such as Figure 8 As shown, the first gas flow channel 11 and the second gas flow channel 12 are arranged in the circumferential direction of the housing 1;

[0075] Or, such as Figure 7 As shown, there are multiple first gas flow channels 11 and multiple second gas flow channels 12, which are arranged alternately in the circumferential direction of the housing 1. For example, in Figure 7 In the example shown, there are two first gas channels 11 and two second gas channels 12, which are arranged alternately in the circumferential direction of the housing 1. However, the present invention is not limited to this, and the number of first gas channels 11 and second gas channels 12 can be more, such as 3, 4, 5 or 6.

[0076] In some embodiments of this utility model, such as Figure 1 , Figure 2 , Figure 9 and Figure 10 As shown, the exhaust gas heating device 10 further includes a positioning component 4, which is disposed within the first gas flow channel 11 and connected to the heating element 2, for fixing the heating element 2. Thus, the heating element 2 can be fixed within the first gas flow channel 11, thereby achieving heating of the exhaust gas.

[0077] In some embodiments of this utility model, such as Figures 1-5 As shown, a partition 5 is provided inside the housing 1, which divides the internal space of the housing 1 into a first gas flow channel 11 and a second gas flow channel 12. It can be understood that the partition 5 extends along the axial direction of the housing 1, thereby allowing the first gas flow channel 11 and the second gas flow channel 12 to be separated. When it is not necessary to heat the exhaust gas, the switching assembly 3 closes the first gas flow channel 11 and opens the second gas flow channel 12, so that the exhaust gas can only enter the second gas flow channel 12, thereby preventing the exhaust gas from contacting the heating element 2 in the first gas flow channel 11.

[0078] Furthermore, the partition 5 has a heat insulation material on the side facing the first gas flow channel 11 or the side facing the second gas flow channel 12. The heat insulation material can be formed of ceramic or heat insulation cotton. This achieves a heat insulation effect between the first gas flow channel 11 and the second gas flow channel 12, preventing the high-temperature exhaust gas from affecting the heating element 2 of the first gas flow channel 11 when it flows in the second gas flow channel 12. This further reduces the damage to the heating element 2 caused by continuous high temperature and improves the service life of the heating element 2.

[0079] In some embodiments of this utility model, such as Figures 1-5As shown, the first gas flow channel 11 is arranged around the second gas flow channel 12. The door opening and closing assembly includes: a first switching mechanism 31, a second switching mechanism 32 and a drive assembly 33. The first switching mechanism 31 is movable to open or close the first gas flow channel 11, and the second switching mechanism 32 is movable to open or close the second gas flow channel 12. The drive assembly 33 is used to drive the first switching mechanism 31 and the second switching mechanism 32 to move.

[0080] It is understandable that by controlling the opening and closing of the first gas flow channel 11 and the second gas flow channel 12 through the first switching mechanism 31 and the second switching mechanism 32 respectively, the opening and closing of the first gas flow channel 11 and the second gas flow channel 12 can operate independently, making the opening and closing of the first gas flow channel 11 and the second gas flow channel 12 more stable and reliable.

[0081] When it is necessary to heat the exhaust gas, the drive assembly 33 drives the first switch mechanism 31 to open the first gas flow channel 11, and at the same time drives the second switch mechanism 32 to close the second gas flow channel 12, so that the exhaust gas can only enter the first gas flow channel 11. At this time, the heating element 2 works to heat the exhaust gas. When it is not necessary to heat the exhaust gas, the drive assembly 33 drives the first switch mechanism 31 to close the first gas flow channel 11, and at the same time drives the second switch mechanism 32 to open the second gas flow channel 12, so that the exhaust gas can only enter the second gas flow channel 12, thereby preventing the exhaust gas from contacting the heating element 2 in the first gas flow channel 11.

[0082] In some embodiments of this utility model, such as Figures 3-5 As shown, the drive assembly 33 includes: a drive motor 331, a first swing arm 332, and a second swing arm 333. The drive motor 331 is fixed relative to the housing 1. The first swing arm 332 is connected to the output shaft of the drive motor 331 and to the first switching mechanism 31, and is used to drive the first switching mechanism 31 to open or close the first gas flow channel 11. The second swing arm 333 is connected to the output shaft of the drive motor 331 and to the second switching mechanism 32, and is used to drive the second switching mechanism 32 to open or close the second gas flow channel 12.

[0083] Understandably, when exhaust gas needs heating, the output shaft of the drive motor 331 rotates, driving the first swing arm 332 to rotate, thereby driving the first switching mechanism 31 to open the first gas flow channel 11. Simultaneously, the output shaft of the drive motor 331 drives the second swing arm 333 to rotate, thereby driving the second switching mechanism 32 to close the second gas flow channel 12, ensuring that exhaust gas can only enter the first gas flow channel 11. At this time, the heating element 2 operates, heating the exhaust gas. When exhaust gas heating is not required, the output shaft of the drive motor 331 rotates in the opposite direction, driving the first swing arm 332 to rotate, driving the first switching mechanism 31 to close the first gas flow channel 11. Simultaneously, the output shaft of the drive motor 331 drives the second swing arm 333 to rotate in the opposite direction, driving the second switching mechanism 32 to open the second gas flow channel 12, ensuring that exhaust gas can only enter the second gas flow channel 12, thus preventing the exhaust gas from contacting the heating element 2 inside the first gas flow channel 11.

[0084] Furthermore, such as Figures 3-5 As shown, the housing 1 has multiple connecting rods, and the output shaft of the drive motor 331 is rotatably inserted through the connecting rods, thereby achieving relative fixation between the drive motor 331 and the housing 1.

[0085] In some embodiments of this utility model, such as Figures 3-5 As shown, the first switching mechanism 31 is an iris mechanism. It can be understood that when the first switching mechanism 31 is an iris mechanism, it includes: a first iris flap 311, a first fixed disk 312, and a first rotating disk 313. Both the first fixed disk 312 and the first rotating disk 313 are arranged around the housing 1, along the axial direction of the housing 1. The first fixed disk 312 is relatively fixed to the housing 1, while the first rotating disk 313 is rotatable relative to the housing 1. The rotation axis of the first rotating disk 313 coincides with the axis of the housing 1. The first rotating disk 313 is connected to the first switching mechanism 31, which drives the first rotating disk 313 to rotate.

[0086] The first iris flap 311 is disposed between the first fixed disk 312 and the first rotating disk 313. There are multiple first iris flaps 311 arranged in the circumferential direction of the housing 1. The multiple first iris flaps 311 are rotatably disposed on the first fixed disk 312. Each first iris flap 311 has a first sliding groove 314 extending in the radial direction of the housing 1. The first fixed disk 312 has a first sliding rod corresponding one-to-one with the first sliding grooves 314 of the multiple first iris flaps 311. The first sliding rod is movably disposed in the first sliding groove 314 along the length direction of the first sliding groove 314.

[0087] Therefore, when the first switching mechanism 31 opens the first gas flow channel 11, it drives the first rotating disk 313 to rotate, causing the multiple first iris lobes 311 to rotate away from each other, thus opening the first gas flow channel 11. When the first switching mechanism 31 closes the first gas flow channel 11, it drives the first rotating disk 313 to rotate in the opposite direction, causing the multiple first iris lobes 311 to rotate closer to each other, thus closing the first gas flow channel 11.

[0088] In some embodiments of this utility model, such as Figures 3-5 As shown, the second switching mechanism 32 is an iris mechanism. It can be understood that when the second switching mechanism 32 is an iris mechanism, it includes: a second iris flap 321, a second fixed disk, and a second rotating disk. Both the second fixed disk and the second rotating disk are arranged around the partition 5 (second gas flow channel 12). The second fixed disk and the second rotating disk are arranged along the axial direction of the housing 1. The second fixed disk and the housing 1 are relatively fixed, while the second rotating disk is rotatable relative to the housing 1. The rotation axis of the second rotating disk coincides with the axis of the housing 1. The second rotating disk is connected to the second switching mechanism 32, which drives the second rotating disk to rotate.

[0089] The second iris flap 321 is disposed between the second fixed disk and the second rotating disk. There are multiple second iris flaps 321 arranged in the circumferential direction of the housing 1. The multiple second iris flaps 321 are rotatably disposed on the second fixed disk. Each second iris flap 321 has a second sliding groove extending in the radial direction of the housing 1. The second fixed disk has a second sliding rod corresponding to the second sliding groove of the multiple second iris flaps 321. The second sliding rod is movably disposed in the second sliding groove along the length direction of the second sliding groove.

[0090] Therefore, when the second switching mechanism 32 opens the second gas flow channel 12, it drives the second rotating disk to rotate, causing the multiple second iris lobes 321 to rotate away from each other, thus opening the second gas flow channel 12. When the second switching mechanism 32 closes the second gas flow channel 12, it drives the second rotating disk to rotate in the opposite direction, causing the multiple second iris lobes 321 to rotate closer to each other, thus closing the second gas flow channel 12.

[0091] In some embodiments of this utility model, such as Figure 1 , Figure 2 , Figure 9 and Figure 10As shown, the exhaust gas heating device 10 further includes a positioning component 4, which is disposed within the first gas flow channel 11 and connected to the heating element 2 for fixing the heating element 2. The positioning component 4 is connected to both the inner peripheral wall of the housing 1 and the partition 5. Therefore, on the one hand, the heating element 2 can be fixed, improving the installation reliability of the heating element 2; on the other hand, since the positioning component 4 is connected to both the inner peripheral wall of the housing 1 and the partition 5, the partition 5 can be installed and fixed within the housing 1, improving the installation reliability of the partition 5.

[0092] In some embodiments of this utility model, such as Figure 1 , Figure 2 , Figure 9 and Figure 10 As shown, the positioning component 4 includes: a first support member 41 and a second support member 42. The first support member 41 is disposed on one side of the heating member 2 along the axial direction of the housing 1. The first support member 41 extends along the circumferential direction of the housing 1 and is connected to the heating member 2. The second support member 42 extends along the radial direction of the housing 1 and is connected to the first support member 41. One end of the second support member 42 in the length direction is connected to the partition 5, and the other end is connected to the inner circumferential wall of the housing 1.

[0093] It is understood that the heating element 2 extends along the circumferential direction of the housing 1, and the first support member 41 extends along the circumferential direction of the housing 1 and is connected to the heating element 2, thereby improving the installation stability of the heating element 2. The side of the first support member 41 facing the heating element 2 has an insulating coating, thereby preventing leakage and improving safety.

[0094] The arrangement of the second support member 42 allows the first support member 41 to be fixed relative to the housing 1, and also allows the partition 5 to be fixed relative to the housing 1. Multiple second support members 42 are arranged along the circumferential direction of the housing 1, thereby improving the installation stability of the partition 5, the first support member 41, and the heating element 2 within the housing 1. For example, in... Figure 2 In the example shown, there are four second support members 42, but the present invention is not limited to this. The number of second support members 42 can also be other numbers, such as 2, 3, 5 or 6.

[0095] In some embodiments of this utility model, such as Figure 1 , Figure 2 and Figure 10 As shown, the positioning assembly 4 further includes a positioning post 43, which extends along the axial direction of the housing 1. One end of the positioning post 43 in the length direction is connected to the second support member 42, and the outer peripheral wall of the positioning post 43 is connected to the heating element 2. This further improves the installation stability of the heating element 2 within the housing 1.

[0096] In some embodiments of this utility model, such as Figure 1 , Figure 2 and Figure 10 As shown, the positioning post 43 includes: a support pin 431, a buffer layer 432, an insulating layer 433, and a connecting layer 434.

[0097] The support pin 431 is connected to the first support member 41; wherein, the support pin 431 is a metal part with high rigidity, and the setting of the support pin 431 improves the reliability of supporting the heating element 2. The support pin 431 is preferably made of nickel-chromium alloy, iron-chromium-aluminum alloy, or SUS444 or SUS441, or SUS430, with a round mushroom-shaped head and a connecting thread at the tail.

[0098] The buffer layer 432 is sleeved around and connected to the support pin 431. The buffer layer 432 serves two purposes: firstly, it provides insulation between the heating element 2 and the support pin 431, preventing electrical leakage and improving safety; secondly, it prevents vibrations from the vehicle 100 from being transmitted to the heating element 2, thus providing vibration damping and protection. The buffer layer 432 is made of high-temperature resistant cotton, preferably aluminum silicate fiber cotton, mullite, or glass wool.

[0099] An insulating layer 433 is fitted over and connected to the buffer layer 432; the insulating layer 433 further improves the insulation between the heating element 2 and the support pin 431, thereby preventing leakage and improving safety. The insulating layer 433 is made of ceramic material, preferably alumina or zirconium oxide.

[0100] The connecting layer 434 is sleeved outside and connected to the insulating layer 433, and is adapted to connect with the heating element 2. This improves the reliability of the connection between the positioning post 43 and the heating element 2. The connecting layer 434 is made of metal, preferably a nickel-chromium alloy, an iron-chromium-aluminum alloy, or SUS444, SUS441, or SUS430.

[0101] In some embodiments of this utility model, such as Figure 1 , Figure 2 , Figure 9 As shown, the positioning assembly 4 also includes a third support member 44, which extends radially along the housing 1. One end of the third support member 44 is connected to the partition 5 along its length, and the other end is connected to the heating element 2. The provision of the third support member 44 further improves the installation reliability of the heating element 2 within the housing 1.

[0102] Furthermore, such as Figure 9As shown, the third support member 44 includes a first insulating part 441 and a first connecting part 442. The first insulating part 441 is disposed on the side of the first connecting part 442 facing the heating element 2. The first insulating part 441 extends along the circumferential direction of the partition 5, and the first connecting part 442 extends along the radial direction of the housing 1. The first insulating part 441 and the first connecting part 442 are connected. The inner radial end of the heating element 2 passes through the first insulating part 441, and the first connecting part 442 is connected to the partition 5. Thus, insulation between the partition 5 and the heating element 2 is achieved, leakage is avoided, and safety is improved.

[0103] In some embodiments of this utility model, the length of the third support member 44 is greater than or equal to 5mm, such as 5mm, 6mm, 7mm, or 10mm. This ensures a sufficient distance between the heating element 2 and the partition 5, allowing the heating element 2 to be kept away from the second gas flow channel 12. This prevents the high-temperature exhaust gas from affecting the heating element 2 when flowing within the second gas flow channel 12, further reducing the damage to the heating element 2 caused by continuous high temperatures and improving its service life.

[0104] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the positioning component 4 also includes a fourth support member 45, which is disposed between the inner peripheral wall of the housing 1 and the heating element 2, and is connected to both the inner peripheral wall of the housing 1 and the heating element 2.

[0105] The fourth support member 45 further improves the installation reliability of the heating element 2 within the housing 1.

[0106] Furthermore, such as Figure 9 As shown, the fourth support member 45 includes a second insulating part and a second connecting part. The second insulating part is located on the side of the second connecting part facing the heating element 2. The second insulating part extends along the circumferential direction of the partition 5, and the second connecting part extends along the radial direction of the housing 1. The second insulating part is connected to the second connecting part. The outer radial end of the heating element 2 passes through the second insulating part, and the second connecting part is connected to the inner peripheral wall of the housing 1. Thus, insulation is achieved between the inner peripheral wall of the housing 1 and the heating element 2, preventing leakage and improving safety.

[0107] The following is for reference. Figure 11 Description of vehicle 100 according to the present invention.

[0108] like Figure 11As shown, a vehicle 100 according to an embodiment of the present invention includes: an engine 20, a three-way catalytic converter 30, and the aforementioned exhaust gas heating device 10. The exhaust gas heating device 10 is disposed between the exhaust port of the engine 20 and the air intake port of the three-way catalytic converter 30. It can be understood that by disposing of the exhaust gas heating device 10 between the exhaust port of the engine 20 and the air intake port of the three-way catalytic converter 30, when the engine 20 is in a cold start state, the exhaust gas heating device 10 can heat the exhaust gas discharged by the engine 20, thereby improving the reaction efficiency of the exhaust gas in the three-way catalytic converter 30 and reducing the emission of pollutants.

[0109] According to the vehicle 100 of this utility model embodiment, by providing the above-mentioned exhaust gas heating device 10, a first gas flow channel 11 and a second gas flow channel 12 are formed in the housing 1, which are spaced apart. The first gas flow channel 11 and the second gas flow channel 12 extend along the axial direction of the housing 1 and penetrate the housing 1. The heating element 2 is disposed in the first gas flow channel 11. The switch assembly 3 is used to open or close the first gas flow channel 11 and open or close the second gas flow channel 12. When it is necessary to heat the exhaust gas, the switch assembly 3 opens the first gas flow channel 11 and closes the second gas flow channel 12 at the same time, so that the exhaust gas enters the first gas flow channel 11 to heat the exhaust gas. When it is not necessary to heat the exhaust gas, the switch assembly 3 closes the first gas flow channel 11 and opens the second gas flow channel 12, so that the exhaust gas enters the second gas flow channel 12, avoiding contact between the exhaust gas and the heating element 2 in the first gas flow channel 11. On the one hand, since the exhaust gas spends a very short time in the first gas flow channel 11, the damage to the heating element 2 is reduced, and the service life of the heating element 2 is improved. On the other hand, since the heating element 2 is less damaged, the cross-sectional area of ​​the heating element 2 can be reduced to increase the resistance value of the heating element 2, thereby increasing the heating power and improving the heating efficiency of the exhaust gas.

[0110] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0111] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A tail gas heating device, characterized in that, include: A housing, wherein a first gas flow channel and a second gas flow channel are formed within the housing, the first gas flow channel and the second gas flow channel extending along the axial direction of the housing and penetrating the housing; A heating element, wherein the heating element is disposed within the first gas flow channel; A switching assembly for opening or closing the first gas flow channel and opening or closing the second gas flow channel.

2. The exhaust gas heating device according to claim 1, characterized in that, The ratio of the cross-sectional area of ​​the first gas flow channel perpendicular to the axis of the housing to the cross-sectional area of ​​the second gas flow channel perpendicular to the axis of the housing is 1-7.

3. The exhaust gas heating device according to claim 1, characterized in that, The switching assembly closes the second gas channel when the first gas channel is opened, and opens the second gas channel when the first gas channel is closed.

4. The exhaust gas heating device according to any one of claims 1-3, characterized in that, The switching assembly includes: A switch structure, wherein the switch structure is single and movable, is used to open the first gas flow channel and close the second gas flow channel, or close the first gas flow channel and open the second gas flow channel; A driving component, which is used to drive the movement of the switch structure.

5. The exhaust gas heating device according to any one of claims 1-3, characterized in that, The switching assembly includes: A first switching mechanism and a second switching mechanism, wherein the first switching mechanism is movable and used to open or close the first gas flow channel, and the second switching mechanism is movable and used to open or close the second gas flow channel; A driving component, the driving component being used to drive the first switching mechanism to move and the second switching mechanism to move.

6. The exhaust gas heating device according to claim 5, characterized in that, The driving component is one that simultaneously drives the first switching mechanism and the second switching mechanism to move; Alternatively, there may be two drive components, which respectively drive the first switching mechanism and the second switching mechanism to move.

7. The exhaust gas heating device according to claim 1, characterized in that, The first gas flow channel is arranged around the second gas flow channel, and the axis of the first gas flow channel coincides with the axis of the second gas flow channel; Alternatively, the second gas flow channel is arranged around the first gas flow channel, and the axis of the first gas flow channel coincides with the axis of the second gas flow channel; Alternatively, the first gas flow channel and the second gas flow channel are arranged in the circumferential direction of the housing; Alternatively, there may be multiple first gas channels and multiple second gas channels, with the multiple first gas channels and multiple second gas channels arranged alternately in the circumferential direction of the housing.

8. The exhaust gas heating device according to claim 1, characterized in that, Also includes: A positioning component is disposed within the first gas flow channel and connected to the heating element, for fixing the heating element.

9. The exhaust gas heating device according to claim 1, characterized in that, The housing is provided with a partition, which divides the space inside the housing into a first gas flow channel and a second gas flow channel.

10. The exhaust gas heating device according to claim 9, characterized in that, The first gas flow channel is arranged around the second gas flow channel, and the switching assembly includes: A first switching mechanism and a second switching mechanism, wherein the first switching mechanism is movable to open or close the first gas flow channel, and the second switching mechanism is movable to open or close the second gas flow channel; A driving component, the driving component being used to drive the first switching mechanism to move and the second switching mechanism to move.

11. The exhaust gas heating device according to claim 10, characterized in that, The driving component includes: A drive motor, which is fixed relative to the housing; The first swing arm is connected to the output shaft of the drive motor and to the first switching mechanism, and is used to drive the first switching mechanism to open or close the first gas flow channel. The second swing arm is connected to the output shaft of the drive motor and to the second switching mechanism, and is used to drive the second switching mechanism to open or close the second gas flow channel.

12. The exhaust gas heating device according to claim 10, characterized in that, The first switching mechanism is an iris recognition mechanism; And / or, the second switching mechanism is an iris mechanism.

13. The exhaust gas heating device according to claim 10, characterized in that, Also includes: A positioning component is disposed within the first gas flow channel and connected to the heating element for fixing the heating element. The positioning component is connected to the inner peripheral wall of the housing and the partition.

14. The exhaust gas heating device according to claim 13, characterized in that, The positioning component includes: A first support member is disposed on one side of the heating element along the axial direction of the housing, and the first support member extends along the circumferential direction of the housing and is connected to the heating element. The second support extends radially along the housing and is connected to the first support. One end of the second support is connected to the partition in the longitudinal direction, and the other end is connected to the inner peripheral wall of the housing.

15. The exhaust gas heating device according to claim 14, characterized in that, The positioning component also includes: A positioning post extends along the axial direction of the housing, one end of the positioning post along its length is connected to the second support member, and the outer peripheral wall of the positioning post is connected to the heating member.

16. The exhaust gas heating device according to claim 15, characterized in that, The positioning post includes: The support pin is connected to the first support member; A buffer layer, which is sleeved on the outside of the support pin and connected to the support pin; An insulating layer, which is sleeved outside the buffer layer and connected to the buffer layer; A connecting layer is sleeved outside the insulating layer and connected to the insulating layer, and the connecting layer is adapted to be connected to the heating element.

17. The exhaust gas heating device according to claim 14, characterized in that, The positioning component also includes: The third support member extends radially along the housing, with one end of the third support member connected to the partition and the other end connected to the heating element.

18. The exhaust gas heating device according to claim 17, characterized in that, The length of the third support member is greater than or equal to 5 mm.

19. The exhaust gas heating device according to claim 14, characterized in that, The positioning component also includes: A fourth support member is disposed between the inner peripheral wall of the housing and the heating element, and is connected to both the inner peripheral wall of the housing and the heating element.

20. A vehicle, characterized in that, include: engine; Three-way catalytic converter; According to any one of claims 1-19, the exhaust gas heating device is disposed between the exhaust port of the engine and the intake port of the three-way catalytic converter.

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