Exhaust aftertreatment device for internal combustion engine

Abstract

The present invention discloses an exhaust aftertreatment device for an internal combustion engine, comprising a structure in which a DOC component, a DPF component and an exhaust component are arranged on a cylinder, wherein the DOC component comprises an X-shaped guide device, a first V-shaped guide plate, a catalytic oxidation converter and a second V-shaped guide plate. The X-shaped guide device is used to form uniform and stable turbulence of the exhaust gas received from the internal combustion engine, the first V-shaped guide plate and the second V-shaped guide plate are used to reduce the vortex generated by the output gas at each stage, and the slow flow tube in the exhaust component is used to buffer the pressure and speed of the exhaust gas. The present application improves the catalytic oxidation efficiency of the catalytic oxidation converter and improves the passive regeneration efficiency of the catalytic particle trap.

Description

Technical Field

[0001] The present invention relates to the technical field of exhaust gas treatment of internal combustion engines, and in particular to an exhaust gas after-treatment device of an internal combustion engine. Background Art

[0002] The exhaust aftertreatment system of an internal combustion engine utilizes a catalytic oxidizer DOC to catalytically oxidize HC, CO, NO and other pollutants in the exhaust gas emitted by the internal combustion engine, thereby improving the catalytic oxidation efficiency, generating CO2, NO2 and water, and generating heat. When the engine exhaust temperature is in the range of 250℃ to 400℃, the carbon particles captured by the particle filter are continuously passively regenerated, and C and NO2 generate CO2 and N2 under the action of the DPF catalyst. However, the exhaust aftertreatment system of an internal combustion engine in the prior art still has the following problems:

[0003] First, the internal combustion engine exhaust aftertreatment system does not have a uniform flow field for the internal combustion engine exhaust gas, so that the catalytic oxidizer is not efficient in catalytically oxidizing HC, CO, NO and other pollutants in the internal combustion engine exhaust gas;

[0004] Second, the exhaust gas of the internal combustion engine and the gas after being treated by the catalytic oxidizer will produce a certain degree of vortex, resulting in relatively large gas resistance, which will also affect the catalytic oxidation effect of the catalytic oxidizer and the effect of the particulate filter in capturing carbon particles;

[0005] Third, for the exhaust gas of the internal combustion engine after being treated by the catalytic oxidizer and the particulate filter, the exhaust is not uniform enough, and the flow resistance and vortex of the gas are too large, which affects the exhaust effect of the exhaust port.

[0006] Therefore, the existing technology needs to be improved. Summary of the invention

[0007] In order to solve the above problems, the present invention discloses an exhaust gas aftertreatment device for an internal combustion engine, comprising:

[0008] Cylinder, DOC assembly, DPF assembly and exhaust assembly;

[0009] An air inlet is arranged at one end of the cylinder, and an exhaust port is arranged at the other end, and the DOC component, the DPF component and the exhaust component are arranged in sequence between the air inlet and the exhaust port inside the cylinder;

[0010] The cylinder comprises a first cylinder, a second cylinder and a third cylinder, the length and inner diameter of the first cylinder are adapted to the length and outer diameter of the DOC component, the length and inner diameter of the second cylinder are adapted to the length and outer diameter of the DPF component, the length and inner diameter of the third cylinder are adapted to the length and outer diameter of the exhaust component, and the first cylinder, the second cylinder and the third cylinder are connected by a hoop;

[0011] The DOC assembly includes an X-shaped guide device, a first V-shaped guide plate, a catalytic oxidation converter, and a second V-shaped guide plate which are sequentially arranged from one end of the air inlet of the cylinder;

[0012] The X-shaped guide device forms a uniform and stable turbulent flow of the exhaust gas of the internal combustion engine received by the air inlet, and transports the turbulent flow to the first V-shaped guide plate;

[0013] The first V-shaped guide plate and the second V-shaped guide plate are respectively arranged at two ends of the catalytic oxidation converter, and the first V-shaped guide plate and the second V-shaped guide plate are arranged in a mirror image of each other. The first V-shaped guide plate is used to reduce the turbulence of the exhaust gas of the internal combustion engine output by the X-shaped guide device when entering the catalytic oxidation converter, and the exhaust gas of the internal combustion engine is catalytically oxidized by the catalytic oxidation converter and then discharged to the DPF component through the second V-shaped guide plate. The second V-shaped guide plate is used to reduce the vortex of the output gas of the catalytic oxidation converter, thereby reducing the resistance of the output gas of the catalytic oxidation converter;

[0014] The DPF component is arranged at the rear end of the DOC component, and the DPF component comprises: a third V-shaped guide plate, a catalytic particulate trap;

[0015] The third V-shaped guide plate is used to reduce the turbulence of the gas output by the DOC component when entering the catalytic particulate filter, and the catalytic particulate filter performs particulate trapping on the gas output by the DOC component and then outputs it to the exhaust component;

[0016] The exhaust assembly includes a flow-relief tube, which is used to buffer the pressure and speed of the exhaust gas from the DPF assembly.

[0017] In another embodiment, the X-shaped flow guiding device comprises:

[0018] A first vertical plate, a second vertical plate, a third vertical plate, a fourth vertical plate, a first inclined plate, a second inclined plate, a third inclined plate, and a fourth inclined plate;

[0019] The first vertical plate, the second vertical plate, the third vertical plate and the fourth vertical plate have the same structure, and the first vertical plate, the second vertical plate, the third vertical plate and the fourth vertical plate are vertically cross-connected to each other;

[0020] The first inclined plate, the second inclined plate, the third inclined plate and the fourth inclined plate have the same structure, which is a fan-shaped structure, and are sequentially arranged in four quadrants of the first vertical plate, the second vertical plate, the third vertical plate and the fourth vertical plate after the surfaces are vertically crossed and connected;

[0021] The first inclined plate, the second inclined plate, the third inclined plate and the fourth inclined plate are arranged in the same manner;

[0022] One side of the first inclined plate is connected to one side of the first vertical plate, and the other side of the first inclined plate is connected to the surface of the fourth vertical plate in the same quadrant;

[0023] One side of the second inclined plate is connected to one side of the second vertical plate, and the other side of the second inclined plate is connected to the surface of the first vertical plate in the same quadrant;

[0024] One side of the third inclined plate is connected to one side of the third vertical plate, and the other side of the third inclined plate is connected to the surface of the second vertical plate in the same quadrant;

[0025] One side of the fourth inclined plate is connected to one side of the fourth vertical plate, and the other side of the fourth inclined plate is connected to the surface of the third vertical plate in the same quadrant;

[0026] The X-shaped flow guide device is a circular structure, and the outer diameter of the X-shaped flow guide device is the same as the inner diameter of the connection portion of the cylinder to which it is connected.

[0027] In another embodiment, a plurality of first through holes are evenly arranged on the first inclined plate, and the diameter of the first through holes is the same as the hole distance between adjacent first through holes;

[0028] The first through hole is used to balance the pressure of the guiding gas domain.

[0029] In another embodiment, a second through hole is disposed on the surface between the first inclined plate and the fourth inclined plate of the first vertical plate, and the second through hole is disposed in the same manner as the first through hole;

[0030] The second vertical plate, the third vertical plate and the fourth vertical plate are all provided with second through holes with the same parameters as those on the first vertical plate.

[0031] In another embodiment, the edges of the first vertical board and the third vertical board connected form a first angle, the edges of the second vertical board and the fourth vertical board connected form a second angle, and the first angle is consistent with the second angle;

[0032] The first angle is 120 degrees to 170 degrees.

[0033] In another embodiment, the first angle is 162 degrees.

[0034] In another embodiment, the first V-shaped guide plate includes a first opening, a second opening, and a connecting surface;

[0035] The first opening has a larger diameter than the second opening;

[0036] The connecting interface connects the first opening and the second opening;

[0037] The diameter of the first opening is the same as the outer diameter of the X-shaped flow guide device;

[0038] The second opening diameter is the same as the outer diameter of the catalytic oxidation converter.

[0039] In another embodiment, the slow flow tube is a cylindrical structure, whose opening diameter is the same as the outer diameter of the catalytic particulate filter and the length is the same as the length from the catalytic particulate filter to the exhaust port, and the slow flow tube is used to reduce the flow resistance and vortex of the exhaust gas from the catalytic particulate filter.

[0040] Compared with the prior art, the present invention has the following advantages:

[0041] The present invention adopts a structure in which a DOC component, a DPF component and an exhaust component are arranged in a cylinder, wherein the DOC component includes an X-shaped guide device, a first V-shaped guide plate, a catalytic oxidation converter, and a second V-shaped guide plate. The X-shaped guide device is used to form a uniform and stable turbulence of the exhaust gas received from the internal combustion engine, the first V-shaped guide plate and the second V-shaped guide plate are used to reduce the vortex generated by the output gas at each stage, and the slow flow tube in the exhaust component is used to buffer the pressure and speed of the exhaust gas. The present application improves the catalytic oxidation efficiency of the catalytic oxidation converter and improves the passive regeneration efficiency of the catalytic particulate trap. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings used in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 It is a schematic structural diagram of an embodiment of an exhaust gas after-treatment device for an internal combustion engine of the present invention.

[0044] Figure 2 is a schematic structural diagram of an embodiment of the X-shaped flow guiding device of the present invention;

[0045] Figure 3 is a structural schematic diagram of an embodiment of a first V-shaped guide plate of the present invention;

[0046] Figure 4 It is a structural schematic diagram of an embodiment of the slow flow tube of the present invention.

[0047] In the figure: 100 cylinder, 101 air inlet, 102 exhaust port, 200 DOC assembly, 201X-type guide device, 2011 first vertical plate, 2012 second vertical plate, 2013 third vertical plate, 2014 fourth vertical plate, 2015 first inclined plate, 2016 second inclined plate, 2017 third inclined plate, 2018 fourth inclined plate, 2019 first through hole, 2010 second through hole, 202 first V-shaped guide plate, 2021 first opening, 2022 second opening, 2023 connecting surface, 203 catalytic oxidation converter, 204 second V-shaped guide plate, 300 DPF assembly, 301 third V-shaped guide plate, 302 catalytic particulate filter, 400 exhaust assembly, 401 slow flow cylinder. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0049] Example 1

[0050] Figure 1 FIG. 1 is a schematic structural diagram of an embodiment of an exhaust gas aftertreatment device for an internal combustion engine according to the present invention. Figure 1 As shown, the exhaust gas aftertreatment device of the internal combustion engine includes:

[0051] The cylinder 100, the DOC assembly 200, the DPF assembly 300 and the exhaust assembly 400;

[0052] An air inlet 101 is disposed at one end of the cylinder 100, and an exhaust port 102 is disposed at the other end. The DOC assembly 200, the DPF assembly 300 and the exhaust assembly 400 are sequentially disposed between the air inlet 101 and the exhaust port 102 inside the cylinder 100;

[0053] The cylinder 100 includes a first cylinder, a second cylinder, and a third cylinder. The length and inner diameter of the first cylinder are adapted to the length and outer diameter of the DOC assembly 200, the length and inner diameter of the second cylinder are adapted to the length and outer diameter of the DPF assembly 300, and the length and inner diameter of the third cylinder are adapted to the length and outer diameter of the exhaust assembly 400. The first cylinder, the second cylinder, and the third cylinder are connected by a hoop; the DOC assembly 200 is installed inside the first cylinder, the DPF assembly 300 is installed inside the second cylinder, and the exhaust assembly 400 is installed inside the third cylinder;

[0054] The DOC assembly 200 includes an X-shaped guide device 201, a first V-shaped guide plate 202, a catalytic oxidation converter 203, and a second V-shaped guide plate 204 which are sequentially arranged from one end of the air inlet 101 of the cylinder 100;

[0055] The X-shaped guide device 201 forms a uniform and stable turbulent flow of the exhaust gas of the internal combustion engine received by the air inlet 101, and transmits the turbulent flow to the first V-shaped guide plate 202;

[0056] The first V-shaped guide plate 202 and the second V-shaped guide plate 204 are respectively arranged at the two ends of the catalytic oxidation converter 203, and the first V-shaped guide plate 202 and the second V-shaped guide plate 204 are arranged in a mirror image of each other. The first V-shaped guide plate 202 is used to reduce the turbulence of the exhaust gas of the internal combustion engine output by the X-shaped guide device 201 When entering the catalytic oxidation converter 203, the exhaust gas of the internal combustion engine is catalytically oxidized by the catalytic oxidation converter 203 and then discharged to the DPF component 300 through the second V-shaped guide plate 204. The second V-shaped guide plate 204 is used to reduce the vortex of the output gas of the catalytic oxidation converter 203, thereby reducing the resistance of the output gas of the catalytic oxidation converter 203;

[0057] The DPF assembly 300 is disposed at the rear end of the DOC assembly 200, and the DPF assembly 300 includes: a third V-shaped guide plate 301, a catalytic particulate trap 302;

[0058] The third V-shaped guide plate 301 is used to reduce the turbulence of the gas output from the DOC component 200 when entering the catalytic particulate filter 302, and the catalytic particulate filter 302 performs particulate trapping on the gas output from the DOC component 200 and then outputs it to the exhaust component 400;

[0059] The exhaust assembly 400 includes a flow-relief tube 401 , and the flow-relief tube 401 is used to buffer the pressure and speed of the exhaust gas of the DPF assembly 300 .

[0060] Specifically, since the exhaust gas of the internal combustion engine enters the cavity of the cylinder 100 through the air inlet 101, there is a large vortex. Therefore, after the large vortex enters the X-shaped guide device 201, the X-shaped guide device 201 disperses the large vortex of the exhaust gas of the internal combustion engine received into small vortices, reduces the vortex dissipation rate, and then guides and disperses the airflow to form a uniform and stable small turbulence, and balances the pressure of the exhaust gas of the internal combustion engine in various domains, and then reduces the vortex generated by the gas output by the X-shaped guide device 201 before being input into the catalytic oxidation converter 203 through the first V-shaped guide plate 202. The exhaust gas of the internal combustion engine is catalytically oxidized through the catalytic oxidation converter 203, so that the HC, CO, NO and other pollutants in the exhaust gas of the internal combustion engine are catalytically oxidized to generate CO 2 、NO 2 and water, and generates heat energy. Compared with the traditional catalytic oxidation treatment, the airflow input to the catalytic oxidation converter 203 is more uniform and less turbulent, so the catalytic oxidation efficiency is higher. After the exhaust gas of the internal combustion engine passes through the catalytic oxidation converter 203 for catalytic oxidation treatment, the exhaust gas is further subjected to a smaller turbulence treatment through the second V-shaped guide plate 204 and is input to the DPF component 300. The third V-shaped guide plate 301 of the DPF component 300 further reduces the vortex generated by the gas before it is input to the catalytic particulate trap 302. The exhaust gas of the catalytic oxidation converter 203 passes through the catalytic particulate trap 302 for particle trapping, and the carbon particles in the exhaust gas of the catalytic oxidation converter 203 are continuously passively regenerated, and C and NO 2 CO is generated under the action of the DPF catalyst of the catalytic particulate trap 302. 2 and N 2 Due to the multiple turbulence reduction operations of the second V-shaped guide plate 204 and the third V-shaped guide plate 301 on the exhaust gas of the catalytic particulate filter 302, the turbulence of the gas received by the catalytic particulate filter 302 is smaller, so that the passive regeneration efficiency of the catalytic particulate filter 302 is higher, and the CO output by the catalytic particulate filter 302 is reduced. 2 and N 2 After passing through the slow flow tube 401 of the exhaust component 400, the exhaust gas is processed by the slow flow tube 401 to reduce the pressure, reduce the vortex, and reduce the flow resistance. 2 and N 2 Stable output to the exhaust port 102.

[0061] Example 2

[0062] Figure 2 FIG. 1 is a schematic structural diagram of an embodiment of an X-shaped flow guiding device of the present invention. Figure 2As shown, the X-shaped flow guiding device 201 includes:

[0063] A first vertical plate 2011, a second vertical plate 2012, a third vertical plate 2013, a fourth vertical plate 2014, a first inclined plate 2015, a second inclined plate 2016, a third inclined plate 2017, and a fourth inclined plate 2018;

[0064] The first vertical plate 2011, the second vertical plate 2012, the third vertical plate 2013, and the fourth vertical plate 2014 have the same structure, and the first vertical plate 2011, the second vertical plate 2012, the third vertical plate 2013, and the fourth vertical plate 2014 are vertically cross-connected to each other;

[0065] The first inclined plate 2015, the second inclined plate 2016, the third inclined plate 2017, and the fourth inclined plate 2018 have the same structure, which is a fan-shaped structure, and are sequentially arranged in the four quadrants of the first vertical plate 2011, the second vertical plate 2012, the third vertical plate 2013, and the fourth vertical plate 2014.

[0066] The first inclined plate 2015, the second inclined plate 2016, the third inclined plate 2017, and the fourth inclined plate 2018 are arranged in the same manner;

[0067] One side of the first inclined plate 2015 is connected to one side of the first vertical plate 2011, and the other side of the first inclined plate 2015 is connected to the surface of the fourth vertical plate 2014 in the same quadrant;

[0068] One side of the second inclined plate 2016 is connected to one side of the second vertical plate 2012, and the other side of the second inclined plate 2016 is connected to the surface of the first vertical plate 2011 in the same quadrant;

[0069] One side of the third inclined plate 2017 is connected to one side of the third vertical plate 2013, and the other side of the third inclined plate 2017 is connected to the surface of the second vertical plate 2012 in the same quadrant;

[0070] One side of the fourth inclined plate 2018 is connected to one side of the fourth vertical plate 2014, and the other side of the fourth inclined plate 2018 is connected to the surface of the third vertical plate 2013 in the same quadrant;

[0071] The X-shaped flow guide device 201 is a circular structure, and the outer diameter of the X-shaped flow guide device 201 is the same as the inner diameter of the connection portion of the cylinder 100 to which it is connected.

[0072] A plurality of first through holes 2019 are evenly arranged on the first inclined plate 2015, and the diameter of the first through holes 2019 is the same as the hole distance between adjacent first through holes 2019;

[0073] The first through hole 2019 is used to balance the pressure of the guide gas domain.

[0074] A second through hole 2010 is disposed on the surface between the first inclined plate 2015 and the fourth inclined plate 2018 of the first vertical plate 2011, and the second through hole 2010 is disposed in the same manner as the first through hole 2019;

[0075] The second vertical plate 2012 , the third vertical plate 2013 , and the fourth vertical plate 2014 are all provided with second through holes 2010 having the same parameters as those on the first vertical plate 2011 .

[0076] The edges of the first vertical plate 2011 and the third vertical plate 2013 connected form a first angle, and the edges of the second vertical plate 2012 and the fourth vertical plate 2014 connected form a second angle, and the first angle is consistent with the second angle; the first angle is 120 degrees to 170 degrees. As a preferred embodiment, the first angle is 162 degrees.

[0077] Specifically, the front elevations of the first vertical plate 2011, the second vertical plate 2012, the third vertical plate 2013, and the fourth vertical plate 2014 are all right-angled trapezoidal structures, and the inclined surfaces of each vertical plate are connected to each other. Therefore, each vertical plate is a vertical structure, but the sides form an angle. The first vertical plate 2011 and the third vertical plate 2013 form a first angle, and the second vertical plate 2012 and the fourth vertical plate 2014 form a second angle. The first inclined plate 2015, the second inclined plate 2016, the third inclined plate 2017, and the fourth inclined plate 2018 are respectively connected to the four quadrants formed by the first vertical plate 2011, the second vertical plate 2012, the third vertical plate 2013, and the fourth vertical plate 2014. Taking the first quadrant connected to the first inclined plate 2015 as an example, the first One side of the inclined plate 2015 is connected to the lower side of the first vertical plate 2011, and the other side of the first inclined plate 2015 is connected to the surface of the fourth vertical plate 2014. At this time, there is a triangular surface between the connecting line between the first inclined plate 2015 and the surface of the fourth vertical plate 2014 and the bottom side, and a second through hole 2010 is arranged on the triangular surface. The first through hole 2019 with the same structure is arranged on the first inclined plate 2015, the second inclined plate 2016, the third inclined plate 2017 and the fourth inclined plate 2018. In this way, the pressure of each gas domain of the guide structure is balanced, so that the received exhaust gas of the internal combustion engine forms a stable small turbulence, so as to improve the catalytic oxidation efficiency of the catalytic oxidation converter 203 arranged at the rear.

[0078] Example 3

[0079] Figure 3 : is a schematic structural diagram of an embodiment of the first V-shaped guide plate of the present invention, such as Figure 3As shown, the first V-shaped guide plate 202 includes a first opening 2021, a second opening 2022 and a connecting surface 2023;

[0080] The diameter of the first opening 2021 is larger than that of the second opening 2022;

[0081] The connection interface connects the first opening 2021 and the second opening 2022;

[0082] The diameter of the first opening 2021 is the same as the outer diameter of the X-shaped flow guiding device 201;

[0083] The diameter of the second opening 2022 is the same as the outer diameter of the catalytic oxidation converter 203 .

[0084] Example 4

[0085] Figure 4 Schematic diagram of the structure of an embodiment of the slow flow tube of the present invention. Figure 4 As shown, the slow flow tube 401 is a cylindrical structure, whose opening diameter is the same as the outer diameter of the catalytic particulate filter 302, and the length is the same as the length from the catalytic particulate filter 302 to the exhaust port 102. The slow flow tube 401 is used to reduce the flow resistance and vortex of the exhaust gas from the catalytic particulate filter 302.

[0086] The exhaust after-treatment device of an internal combustion engine provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

[0087] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An exhaust gas aftertreatment device for an internal combustion engine, characterized in that: The device comprises: Cylinder, DOC assembly, DPF assembly and exhaust assembly; An air inlet is arranged at one end of the cylinder, and an exhaust port is arranged at the other end, and the DOC component, the DPF component and the exhaust component are arranged in sequence between the air inlet and the exhaust port inside the cylinder; The cylinder comprises a first cylinder, a second cylinder and a third cylinder, the length and inner diameter of the first cylinder are adapted to the length and outer diameter of the DOC component, the length and inner diameter of the second cylinder are adapted to the length and outer diameter of the DPF component, the length and inner diameter of the third cylinder are adapted to the length and outer diameter of the exhaust component, and the first cylinder, the second cylinder and the third cylinder are connected by a hoop; The DOC assembly includes an X-shaped guide device, a first V-shaped guide plate, a catalytic oxidation converter, and a second V-shaped guide plate which are sequentially arranged from one end of the air inlet of the cylinder; The X-shaped flow guide device forms uniform and stable turbulence on the exhaust gas of the internal combustion engine received by the air inlet, and delivers the turbulence to the first V-shaped flow guide plate. The X-shaped flow guide device disperses the large vortex of the exhaust gas of the internal combustion engine received into small vortexes, reduces the vortex dissipation rate, and then guides and disperses the airflow to form uniform and stable small turbulence, and balances the pressure of the exhaust gas of the internal combustion engine in various domains; The first V-shaped guide plate and the second V-shaped guide plate are respectively arranged at two ends of the catalytic oxidation converter, and the first V-shaped guide plate and the second V-shaped guide plate are arranged in a mirror image of each other. The first V-shaped guide plate is used to reduce the turbulence of the exhaust gas of the internal combustion engine output by the X-shaped guide device when entering the catalytic oxidation converter, and the exhaust gas of the internal combustion engine is catalytically oxidized by the catalytic oxidation converter and then discharged to the DPF component through the second V-shaped guide plate. The second V-shaped guide plate is used to reduce the vortex of the output gas of the catalytic oxidation converter, thereby reducing the resistance of the output gas of the catalytic oxidation converter; The DPF component is arranged at the rear end of the DOC component, and the DPF component comprises: a third V-shaped guide plate, a catalytic particulate trap; The third V-shaped guide plate is used to reduce the turbulence of the gas output by the DOC component when entering the catalytic particulate filter, and the catalytic particulate filter performs particulate trapping on the gas output by the DOC component and then outputs it to the exhaust component; The exhaust assembly includes a slow flow tube, which is used to buffer the pressure and speed of the exhaust gas of the DPF assembly, and the slow flow tube reduces the pressure, vortex and flow resistance of the exhaust gas; The X-shaped flow guide device comprises: A first vertical plate, a second vertical plate, a third vertical plate, a fourth vertical plate, a first inclined plate, a second inclined plate, a third inclined plate, and a fourth inclined plate; The first vertical plate, the second vertical plate, the third vertical plate and the fourth vertical plate have the same structure, and the front elevations are all right-angled trapezoidal structures. The first vertical plate, the second vertical plate, the third vertical plate and the fourth vertical plate are mutually perpendicularly cross-connected; The first inclined plate, the second inclined plate, the third inclined plate and the fourth inclined plate have the same structure, which is a fan-shaped structure, and are sequentially arranged in four quadrants of the first vertical plate, the second vertical plate, the third vertical plate and the fourth vertical plate after the surfaces are vertically crossed and connected; The first inclined plate, the second inclined plate, the third inclined plate and the fourth inclined plate are arranged in the same manner; One side of the first inclined plate is connected to one side of the first vertical plate, and the other side of the first inclined plate is connected to the surface of the fourth vertical plate in the same quadrant; One side of the second inclined plate is connected to one side of the second vertical plate, and the other side of the second inclined plate is connected to the surface of the first vertical plate in the same quadrant; One side of the third inclined plate is connected to one side of the third vertical plate, and the other side of the third inclined plate is connected to the surface of the second vertical plate in the same quadrant; One side of the fourth inclined plate is connected to one side of the fourth vertical plate, and the other side of the fourth inclined plate is connected to the surface of the third vertical plate in the same quadrant; The X-shaped flow guide device is a circular structure, and the outer diameter of the X-shaped flow guide device is the same as the inner diameter of the connection portion of the cylinder to which it is connected.

2. The exhaust gas aftertreatment device of an internal combustion engine according to claim 1, characterized in that: A plurality of first through holes are evenly arranged on the first inclined plate, and the diameter of the first through holes is the same as the hole distance between adjacent first through holes; The first through hole is used to balance the pressure of the guiding gas domain.

3. The exhaust gas aftertreatment device of an internal combustion engine according to claim 2, characterized in that: A second through hole is disposed on the surface between the first inclined plate and the fourth inclined plate of the first vertical plate, and the second through hole is disposed in the same manner as the first through hole; The second vertical plate, the third vertical plate and the fourth vertical plate are all provided with second through holes with the same parameters as those on the first vertical plate.

4. The exhaust gas aftertreatment device for an internal combustion engine according to claim 1, characterized in that: The edges of the first vertical plate connected to the third vertical plate form a first angle, the edges of the second vertical plate connected to the fourth vertical plate form a second angle, and the first angle is consistent with the second angle; The first angle is 120 degrees to 170 degrees.

5. The exhaust gas aftertreatment device for an internal combustion engine according to claim 4, characterized in that: The first angle is 162 degrees.

6. The exhaust gas aftertreatment device for an internal combustion engine according to claim 1, characterized in that: The first V-shaped guide plate includes a first opening, a second opening and a connecting surface; The first opening has a larger diameter than the second opening; The connecting surface connects the first opening and the second opening; The diameter of the first opening is the same as the outer diameter of the X-shaped flow guide device; The second opening diameter is the same as the outer diameter of the catalytic oxidation converter.

7. The exhaust gas aftertreatment device for an internal combustion engine according to claim 1, characterized in that: The slow flow tube is a cylindrical structure, the opening diameter of which is the same as the outer diameter of the catalytic particulate filter, and the length is the same as the length from the catalytic particulate filter to the exhaust port. The slow flow tube is used to reduce the flow resistance and vortex of the exhaust gas from the catalytic particulate filter.

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