A combined honeycomb carrier structure

Abstract

The present application relates to a combined honeycomb carrier structure, which relates to the technical field of tail gas treatment equipment. It includes a mounting frame, a front-end carrier, a rear-end carrier and an intermediate carrier arranged on the mounting frame. Gas guiding components are provided between the front-end carrier and the intermediate carrier, and between the intermediate carrier and the rear-end carrier. The gas guiding components are used to guide the tail gas in the middle part of the carrier to the edge of the carrier. The intermediate carrier is connected to the front-end carrier and the rear-end carrier respectively through two groups of connecting components, and the connecting components can fix the gas guiding components. The present application has the effect that the consumption of the catalyst at the center and the edge of the intermediate carrier and the rear-end carrier is more consistent, and the utilization rate of the entire honeycomb carrier structure is improved.

Description

Technical Field

[0001] This application relates to the technical field of tail gas treatment equipment, and particularly to a combined honeycomb carrier structure. Background Art

[0002] A honeycomb carrier is a special material with a honeycomb structure and shape, widely used in industrial fields, especially in industries such as environmental protection and chemical engineering. Honeycomb ceramics have specific properties such as high strength, high temperature resistance, corrosion resistance, and wear resistance, and are suitable for various environmental protection fields, such as automotive exhaust emissions.

[0003] When the existing honeycomb carrier is in use, the high-temperature automotive exhaust gas passes through the honeycomb carrier, heating and reacting with the catalyst on the honeycomb carrier to decompose the exhaust gas into non-toxic gases such as carbon dioxide, water, and nitrogen, thereby achieving the treatment of automotive exhaust gas. However, when the honeycomb carrier catalyzes the exhaust gas, due to the uneven distribution of the exhaust gas in the honeycomb carrier, the catalyst at the center of the honeycomb carrier is consumed faster than that at the edge, resulting in a reduced utilization rate of the honeycomb carrier. Summary of the Invention

[0004] In order to improve the problem that the exhaust gas is unevenly distributed in the honeycomb carrier, resulting in the catalyst at the center of the honeycomb carrier being consumed faster than that at the edge and the utilization rate of the honeycomb carrier being reduced, this application provides a combined honeycomb carrier structure.

[0005] A combined honeycomb carrier structure provided by this application adopts the following technical solutions:

[0006] A combined honeycomb carrier structure includes a mounting frame, a front-end carrier, a rear-end carrier, and an intermediate carrier provided on the mounting frame. Air guiding components are provided between the front-end carrier and the intermediate carrier, and between the intermediate carrier and the rear-end carrier. The air guiding components are used to guide the exhaust gas in the middle part of the carrier to the edge of the carrier. The intermediate carrier is connected to the front-end carrier and the rear-end carrier respectively through two groups of connecting components, and the connecting components can fix the air guiding components.

[0007] By adopting the above technical solutions, when treating the exhaust gas, the exhaust gas enters the front-end carrier, then enters the intermediate carrier through the air guiding components. The exhaust gas coming out of the intermediate carrier enters the rear-end carrier through the second air guiding component and then is discharged. When the exhaust gas passes through the air guiding components, the air guiding components guide the exhaust gas in the middle of the carrier to the edge, which can improve the uniformity of the exhaust gas distribution in the honeycomb carrier, make the consumption of the catalyst at the center and the edge of the intermediate carrier and the rear-end carrier more consistent, and improve the utilization rate of the entire honeycomb carrier structure.

[0008] In a specific feasible embodiment, the air guiding assembly includes a mounting ring and N guiding rings. The N guiding rings are coaxially and spaced apart in the mounting ring and are fixedly connected to the mounting ring through connecting rods. The angles between the wall surfaces of the guiding rings arranged from the inside to the outside of the mounting ring and the exhaust gas flow direction are α1, α2... α N , 0° < α1, α2... α N < 90°, so as to be able to guide the exhaust gas to the edge of the carrier.

[0009] By adopting the above technical solution, by arranging the N guiding rings obliquely to the air flow direction, the exhaust gas in the middle of the carrier is guided to the edge position, increasing the uniformity of the exhaust gas distribution in the carrier structure.

[0010] In a specific feasible embodiment, α1 > α2 > α3 >... > α N , so as to form a wedge-shaped channel between two adjacent guiding rings. The length of the front end of each wedge-shaped channel along the radial direction of the mounting ring is L.

[0011] By adopting the above technical solution, by α1 > α2 > α1 >... > α N and the lengths of the front ends of the wedge-shaped channels are all L. On the one hand, it can reduce the flow distance of the exhaust gas at the edge of the carrier in the wedge-shaped channel at the edge of the mounting ring, reducing the back pressure of the exhaust gas flowing through the guiding ring. On the other hand, it makes the cross-sectional area of the rear end of the wedge-shaped channel at the middle position of the mounting ring smaller than that of the rear end of the wedge-shaped channel on the outside. The velocity of the exhaust gas flowing out of the inner wedge-shaped channel is greater than that of the outer wedge-shaped channel, thereby increasing the flow distance of the exhaust gas in the center of the mounting ring to the edge and improving the uniformity of the exhaust gas distribution in the honeycomb carrier structure after passing through the guiding ring.

[0012] In a specific feasible embodiment, the connection assembly includes a first connection cylinder and a second connection cylinder. The first connection cylinder is rotatably sleeved on the outer shell of the middle carrier. The second connection cylinder is inserted into the first connection cylinder and is threadedly connected to the first connection cylinder. The second connection cylinder can be sleeved on the outer shell of the front-end carrier or the rear-end carrier and is threadedly connected to the front-end carrier or the rear-end carrier.

[0013] By adopting the above technical solution, when installing the middle carrier, first screw the second connection cylinder onto the front-end carrier and the rear-end carrier respectively, then place the middle carrier between the front-end carrier and the rear-end carrier, and then rotate the first connection cylinders at both ends to move towards the second connection cylinder respectively, so that the second connection cylinder is spirally inserted into the first connection cylinder, thereby completing the installation of the middle carrier. When disassembling the middle carrier, there is no need to disassemble or assemble the front-end carrier or the rear-end carrier, thereby improving the convenience of disassembling and assembling the middle carrier.

[0014] In a specific feasible embodiment, a first sealing ring is fixedly provided on the outer shell of the intermediate carrier, and a second sealing ring capable of abutting against the first sealing ring is fixedly provided on the inner wall of the first connecting cylinder.

[0015] By adopting the above technical solution, the abutting of the first sealing ring and the second sealing ring is utilized to improve the sealing effect of the connection between the intermediate carrier, the front-end carrier, and the rear-end carrier.

[0016] In a specific feasible embodiment, the outer diameter of the mounting ring is smaller than the inner diameter of the first connecting cylinder, and the inner diameter of the mounting ring is larger than the outer diameter of the intermediate carrier housing, so that the mounting ring can be inserted between the first connecting cylinder and the housing of the intermediate carrier. The end wall of the second connecting cylinder can abut against one end wall of the mounting ring and abut the other end wall against the first sealing ring.

[0017] By adopting the above technical solution, when installing the mounting ring, first insert the mounting ring between the first connecting cylinder and the housing of the intermediate carrier. When the first connecting cylinder is screwed onto the second connecting cylinder, screw the second connecting cylinder again to move towards the intermediate carrier. The second connecting cylinder presses the mounting ring against the first sealing ring. At this time, keep the second connecting cylinder stationary and rotate the first connecting cylinder to move towards the front-end carrier or the rear-end carrier, so that the second sealing ring abuts against the first sealing ring, thereby completing the installation of the mounting ring and improving the convenience of installing the mounting ring.

[0018] In a specific feasible embodiment, a gas guide pipe connected to the tail gas exhaust pipe is provided on the outer shell of the front-end carrier. A partition pipe sleeved on the housing of the front-end carrier is provided in the gas guide pipe. A connection cavity is formed in the gas guide pipe, a flow cavity is formed between the gas guide pipe and the partition pipe, and a return cavity is formed between the housing of the front-end carrier and the partition pipe. The tail gas can enter the front-end carrier after passing through the connection cavity, the flow cavity, and the return cavity in sequence.

[0019] By adopting the above technical solution, the tail gas enters the front-end carrier after passing through the connection cavity, the flow cavity, and the return cavity. When the tail gas passes through the return cavity, it can heat the catalyst at the edge of the front-end carrier, reduce the temperature difference between the center and the edge of the honeycomb carrier, make the activity of the catalyst in the central region and the edge region more consistent, and make the consumption rate of the catalyst in the honeycomb carrier of the front-end carrier more consistent.

[0020] In a specific feasible embodiment, the flow cross-sectional areas of the connection cavity, the flow cavity, and the return cavity are equal.

[0021] In a specific feasible embodiment, a mounting pipe is fixedly provided on the gas guide pipe. The housing of the front-end carrier can be inserted into the mounting pipe and is threadedly connected to the mounting pipe.

[0022] By adopting the above technical solution, when installing the front-end carrier, the front-end carrier is screwed into the installation pipe, completing the installation of the front-end carrier and the air guide pipe, and improving the convenience of the connection between the two.

[0023] In a specific feasible embodiment, a third sealing ring is provided on the shell of the front-end carrier, and the third sealing ring can abut against the end wall of the installation pipe.

[0024] By adopting the above technical solution, the abutment of the third sealing ring against the end wall of the installation pipe is utilized to improve the connection tightness between the front-end carrier and the air guide pipe.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. When treating the tail gas, the tail gas enters the front-end carrier, then enters the intermediate carrier through the air guide assembly, and the tail gas coming out of the intermediate carrier enters the rear-end carrier through the second air guide assembly and then is discharged. When the tail gas passes through the air guide assembly, the air guide assembly guides the tail gas in the middle of the carrier to the edge, which can improve the uniformity of the tail gas distribution in the honeycomb carrier, making the consumption of the catalyst at the center and the edge of the intermediate carrier and the rear-end carrier more consistent, and improving the utilization rate of the entire honeycomb carrier structure;

[0027] 2. When installing the intermediate carrier, first screw the second connecting cylinder onto the front-end carrier and the rear-end carrier respectively, then place the intermediate carrier between the front-end carrier and the rear-end carrier, and then rotate the first connecting cylinders at both ends to move towards the second connecting cylinder respectively, so that the second connecting cylinder is spirally inserted into the first connecting cylinder, thereby completing the installation of the intermediate carrier. When disassembling the intermediate carrier, there is no need to disassemble or assemble the front-end carrier or the rear-end carrier, thereby improving the convenience of disassembling and assembling the intermediate carrier;

[0028] 3. The tail gas enters the front-end carrier after passing through the connection cavity, the flow cavity, and the return cavity. When the tail gas passes through the return cavity, it can heat the catalyst at the edge of the front-end carrier, reducing the temperature difference between the center and the edge of the honeycomb carrier, making the activity of the catalyst in the central region and the edge region more consistent, and making the consumption rate of the catalyst in the honeycomb carrier of the front-end carrier more consistent. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic structural diagram of a combined honeycomb carrier structure according to an embodiment of the present application.

[0030] Figure 2 is a sectional view taken along the Figure 1 A-A line in

[0031] Figure 3 is a schematic diagram showing the internal structure of the air guide pipe.

[0032] Figure 4 It is a schematic structural diagram for showing the connecting components.

[0033] Figure 5 It is a schematic structural diagram for showing the air guiding components.

[0034] Figure 6 It is along Figure 5 The sectional view taken along line B - B in

[0035] Explanation of reference numerals: 1. Mounting frame; 11. Fixed rod; 21. Front - end carrier; 211. Honeycomb structure; 212. Housing; 22. Rear - end carrier; 23. Intermediate carrier; 3. Air guiding component; 31. Mounting ring; 32. Guide ring; 33. Connecting rod; 34. Wedge - shaped channel; 4. Connecting component; 41. First connecting cylinder; 42. Second connecting cylinder; 43. Second sealing ring; 44. First sealing ring; 51. Air duct; 52. Mounting pipe; 53. Third sealing ring; 54. Dividing pipe; 551. Connecting cavity; 552. Flow cavity; 553. Return cavity. Detailed implementation manners

[0036] The following further elaborates on this application in conjunction with Figures 1-6 the attached drawings.

[0037] The embodiment of this application discloses a combined honeycomb carrier structure.

[0038] Referring to Figure 1 、 Figure 2 , a combined honeycomb carrier structure includes a mounting frame 1 and a front - end carrier 21, a rear - end carrier 22, and an intermediate carrier 23 arranged on the mounting frame 1. In this embodiment, the mounting frame 1 is two fixed rods 11, and both of the two fixed rods 11 are detachably connected to the front - end carrier 21 and the rear - end carrier 22 through bolts. The front - end carrier 21, the intermediate carrier 23, and the rear - end carrier 22 all include a honeycomb structure 211 and a housing 212. A catalyst is coated on the honeycomb structure 211. High - temperature tail gas passes through the honeycomb structure 211 and reacts with the catalyst on the honeycomb structure 211 to achieve the treatment of the tail gas. Air guiding components 3 are arranged between the front - end carrier 21 and the intermediate carrier 23, and between the intermediate carrier 23 and the rear - end carrier 22. The air guiding components 3 are used to guide the tail gas in the middle part of the carrier to the edge of the carrier. The intermediate carrier 23 is detachably connected to the front - end carrier 21 and the rear - end carrier 22 respectively through two groups of connecting components 4, and the connecting components 4 can fix the air guiding components 3.

[0039] When treating the exhaust gas, the exhaust gas enters the front carrier 21, then passes through the air guiding component 3 into the middle carrier 23, and the exhaust gas coming out of the middle carrier 23 passes through the second group of air guiding components 3 into the rear carrier 22 and then is discharged. When the exhaust gas passes through the air guiding component 3, the air guiding component 3 guides the exhaust gas in the middle of the carrier to the edge, which can improve the uniformity of the exhaust gas distribution in the honeycomb carrier, making the consumption of the catalyst at the center and the edge of the middle carrier 23 and the rear carrier 22 more consistent, and improving the utilization rate of the entire honeycomb carrier structure.

[0040] Refer to Figure 2 、 Figure 3 , a gas guide pipe 51 is provided on the front carrier 21. The front end of the gas guide pipe 51 is connected to the exhaust pipe of the vehicle. The middle position of the gas guide pipe 51 is an expanded pipe structure. The large-diameter section of the gas guide pipe 51 is sleeved on the front carrier 21, and a mounting pipe 52 is fixedly provided on the large-diameter section of the gas guide pipe 51. External threads are provided on the inner side wall of the mounting pipe 52, and internal threads matching the external threads are provided on the housing 212 of the front carrier 21. The front carrier 21 is inserted into the mounting pipe 52 and fixed by threaded connection, improving the convenience of disassembly and assembly of the front carrier 21 and the gas guide pipe 51. A third sealing ring 53 is provided on the housing 212 of the front carrier 21. When the front carrier 21 is screwed and inserted into the mounting pipe 52, the third sealing ring 53 abuts against the end wall of the mounting pipe 52, and the connection sealing performance between the front carrier 21 and the gas guide pipe 51 is improved by the abutment of the third sealing ring 53 and the end wall of the mounting pipe 52.

[0041] Refer to Figure 2 、 Figure 3 , a partition pipe 54 is fixedly provided inside the gas guide pipe 51. One end of the partition pipe 54 is open and the other end is blocked. The open rear end of the partition pipe 54 is sleeved on the housing 212 of the front carrier 21, so that the blocked end of the partition pipe 54 is opposite to the inlet end of the front carrier 21. A connection cavity 551 is formed inside the small-diameter section of the gas guide pipe 51, a flow cavity 552 is formed between the gas guide pipe 51 and the partition pipe 54, and a return cavity 553 is formed between the partition pipe 54 and the housing 212 of the front carrier 21. The flow cross-sectional areas of the connection cavity 551, the flow cavity 552, and the return cavity 553 are equal, and the exhaust gas can enter the front carrier 21 through the connection cavity 551, the flow cavity 552, and the return cavity 553 in sequence.

[0042] When treating the automobile exhaust gas, the exhaust gas enters the front carrier 21 after passing through the connection cavity 551, the flow cavity 552, and the return cavity 553. When the exhaust gas passes through the return cavity 553, it can heat the catalyst at the edge of the front carrier 21, reduce the temperature difference between the center and the edge of the honeycomb carrier, make the activity of the catalyst in the center region and the edge region more consistent, and make the consumption rate of the catalyst in the honeycomb carrier of the front carrier 21 more consistent.

[0043] Refer to Figure 2 、Figure 4 , in this embodiment, the connecting component 4 includes a first connecting cylinder 41 and a second connecting cylinder 42. The first connecting cylinder 41 is rotatably sleeved on the housing 212 of the intermediate carrier 23. The second connecting cylinder 42 is inserted into the first connecting cylinder 41 and is threadedly connected to the first connecting cylinder 41. The second connecting cylinder 42 can be sleeved on the outer shell of the front-end carrier 21 or the rear-end carrier 22 and is threadedly connected to the front-end carrier 21 or the rear-end carrier 22. The helix directions, pitches and other characteristics of the threads on the outer side wall and the inner side wall of the second connecting cylinder 42 are the same, so that the second connecting cylinder 42 can maintain relative rotation with the first connecting cylinder 41, the front-end carrier 21 or the rear-end carrier 22 at the same time.

[0044] Refer to Figure 2 , Figure 4 , the inner diameter of the first connecting cylinder 41 is larger than the outer diameter of the housing 212 of the intermediate carrier 23, so that a space is formed between the first connecting cylinder 41 and the intermediate carrier 23. A second sealing ring 43 is fixedly provided at the end of the first connecting cylinder 41. The second sealing ring 43 is slidably sleeved on the intermediate carrier 23. A first sealing ring 44 is fixedly provided on the housing 212 of the intermediate carrier 23. The second sealing ring 43 abuts against the first sealing ring 44 to realize the sealed connection between the first connecting cylinder 41 and the intermediate carrier 23.

[0045] Refer to Figure 4 , Figure 5 and Figure 6 , in this embodiment, the air guiding component 3 includes a mounting ring 31 and N guiding rings 32. The inner diameter of the mounting ring 31 is larger than the outer diameter of the intermediate carrier 23, so that the mounting ring 31 can be inserted into the space between the first connecting cylinder 41 and the housing 212 of the intermediate carrier 23. In this embodiment, N = 3 is taken as an example. The three guiding rings 32 are coaxially and spacedly arranged in the mounting ring 31 and are fixedly connected to the mounting ring 31 through a connecting rod 33. The angles between the wall surfaces of the guiding rings 32 arranged from the inside to the outside of the mounting ring 31 and the exhaust gas flow direction are α1, α2, α3 respectively, 0° < α1, α2, α3 < 90°, and α1 > α2 > α3. By arranging the three guiding rings 32 obliquely to the air flow direction, the exhaust gas in the middle of the carrier is guided to the edge position, increasing the uniformity of the exhaust gas distribution in the carrier structure.

[0046] Refer to Figure 4 , Figure 5 and Figure 6, in this embodiment, α1 = 45°, α2 = 30°, and α3 = 15° are selected, so that a wedge-shaped channel 34 is formed between two adjacent guide rings 32. The distances between the front ends of the guide rings 32 and between the front end of the guide ring 32 and the mounting ring 31 are both L. By using α1 = 45°, α2 = 30°, α3 = 15° and the length of the front edge of the wedge-shaped channel 34 being L, it can be obtained that the length of the wedge-shaped channel 34 of the mounting ring 31 gradually decreases from the inside to the outside, and the flow cross-sectional area of the outlet end of the wedge-shaped channel 34 gradually increases. On the one hand, it can reduce the flow distance of the exhaust gas at the edge of the carrier in the wedge-shaped channel 34 at the edge of the mounting ring 31 and reduce the back pressure of the exhaust gas flowing through the guide ring 32. On the other hand, it makes the cross-sectional area of the rear channel of the wedge-shaped channel 34 at the middle position of the mounting ring 31 smaller than that of the rear channel of the wedge-shaped channel 34 on the outside. The velocity of the exhaust gas flowing out of the inner wedge-shaped channel 34 is greater than that of the outer wedge-shaped channel 34, thereby increasing the flow distance of the exhaust gas at the center of the mounting ring 31 to the edge and making the exhaust gas distribution in the honeycomb carrier structure more uniform after passing through the guide ring 32.

[0047] When installing the intermediate carrier 23 and the mounting ring 31, first insert the mounting ring 31 between the first connecting cylinder 41 and the housing 212 of the intermediate carrier 23. At the same time, screw the second connecting cylinder 42 onto the front-end carrier 21 and the rear-end carrier 22 respectively. Then place the intermediate carrier 23 between the front-end carrier 21 and the rear-end carrier 22. Then rotate the first connecting cylinders 41 at both ends and move them towards the second connecting cylinder 42 respectively, so that the second connecting cylinder 42 is spirally inserted into the first connecting cylinder 41. Then keep the first connecting cylinder 41 stationary and screw the second connecting cylinder 42 towards the intermediate carrier 23. The second connecting cylinder 42 presses the mounting ring 31 against the first sealing ring 44. Then keep the second connecting cylinder 42 stationary and rotate the first connecting cylinder 41 towards the front-end carrier 21 or the rear-end carrier 22 to make the second sealing ring 43 press against the first sealing ring 44, thus completing the installation of the mounting ring 31. There is no need to disassemble and assemble the front-end carrier 21 or the rear-end carrier 22, realizing the separate replacement of the intermediate carrier 23 and improving the convenience of installing the mounting ring 31 and the intermediate carrier 23.

[0048] During the daily inspection of the vehicle or when the intermediate carrier 23 is blocked, it is necessary to disassemble the intermediate carrier 23. Rotate the second connecting cylinder 42 and move it away from the intermediate carrier 23, and make the second connecting cylinder 42 disengage from the first connecting cylinder 41. Then remove the intermediate carrier 23 from the front-end carrier 21 and the rear-end carrier 22, thereby improving the convenience of disassembling and assembling the intermediate carrier 23.

[0049] The implementation principle of a combined honeycomb carrier structure in an embodiment of the present application is as follows: When treating exhaust gas, the exhaust gas enters the front-end carrier 21, then passes through three guiding rings 32 to enter the middle carrier 23, and the exhaust gas coming out of the middle carrier 23 passes through the guiding rings 32 of the second group to enter the rear-end carrier 22 and then is discharged. When the exhaust gas passes through the air guiding assembly 3, the guiding rings 32 guide the exhaust gas in the middle of the carrier to the edge, which can improve the uniformity of the exhaust gas distribution in the honeycomb carrier, making the consumption of the catalyst at the center and the edge of the middle carrier 23 and the rear-end carrier 22 more consistent, and improving the utilization rate of the entire honeycomb carrier structure.

[0050] When installing the middle carrier 23, first insert the installation ring 31 between the first connecting cylinder 41 and the housing 212 of the middle carrier 23. At the same time, screw the second connecting cylinder 42 onto the front-end carrier 21 and the rear-end carrier 22 respectively. Then place the middle carrier 23 between the front-end carrier 21 and the rear-end carrier 22. Then rotate the first connecting cylinders 41 at both ends and move them towards the second connecting cylinder 42 respectively, so that the second connecting cylinder 42 is spirally inserted into the first connecting cylinder 41. Then keep the first connecting cylinder 41 stationary and screw the second connecting cylinder 42 towards the middle carrier 23. The second connecting cylinder 42 presses the installation ring 31 against the first sealing ring 44. Then keep the second connecting cylinder 42 stationary and rotate the first connecting cylinder 41 towards the front-end carrier 21 or the rear-end carrier 22, so that the second sealing ring 43 is pressed against the first sealing ring 44, thus completing the installation of the installation ring 31. There is no need to disassemble and assemble the front-end carrier 21 or the rear-end carrier 22, realizing the separate replacement of the middle carrier 23 and improving the convenience of installing the installation ring 31 and the middle carrier 23.

[0051] The above are all the preferred embodiments of the present application. It does not limit the protection scope of the present application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A combined honeycomb carrier structure, characterized in that: It includes a mounting bracket (1), a front carrier (21), a rear carrier (22) and an intermediate carrier (23) arranged on the mounting bracket (1). An air guiding component (3) is provided between the front carrier (21) and the intermediate carrier (23), and between the intermediate carrier (23) and the rear carrier (22). The air guiding component (3) is used to guide the tail gas in the middle part of the carrier to the edge of the carrier. The intermediate carrier (23) is connected to the front carrier (21) and the rear carrier (22) respectively through two groups of connecting components (4), and the connecting components (4) can fix the air guiding component (3). A gas guide pipe (51) connected to the tail gas exhaust pipe is provided on the housing (212) of the front carrier (21). A dividing pipe (54) sleeved on the housing (212) of the front carrier (21) is arranged in the gas guide pipe (51). A connecting cavity (551) is formed in the gas guide pipe (51), a flow cavity (552) is formed between the gas guide pipe (51) and the dividing pipe (54), and a return cavity (553) is formed between the housing (212) of the front carrier (21) and the dividing pipe (54). The tail gas can enter the front carrier (21) after passing through the connecting cavity (551), the flow cavity (552) and the return cavity (553) in sequence.

2. The combined honeycomb carrier structure according to claim 1, wherein: The air guiding assembly (3) includes a mounting ring (31) and N guiding rings (32). The N guiding rings (32) are coaxially and spaced apart in the mounting ring (31), and are fixedly connected to the mounting ring (31) through connecting rods (33). The angles between the wall surfaces of the guiding rings (32) arranged from the inside to the outside of the mounting ring (31) and the exhaust gas flow direction are α1, α2... α N , 0° < α1, α2... α N < 90°, so as to be able to guide the exhaust gas to the edge of the carrier.

3. The combined honeycomb carrier structure according to claim 2, characterized in that: α1 > α2 > α3 > …… > α N so that a wedge-shaped channel (34) is formed between two adjacent said guide rings (32), and the length of the front end of each said wedge-shaped channel (34) along the radius of the mounting ring (31) is L.

4. The combined honeycomb carrier structure according to claim 2, wherein: The connecting component (4) includes a first connecting cylinder (41) and a second connecting cylinder (42). The first connecting cylinder (41) is rotatably sleeved on the housing (212) of the intermediate carrier (23). The second connecting cylinder (42) is inserted into the first connecting cylinder (41) and is threadedly connected to the first connecting cylinder (41). The second connecting cylinder (42) can be sleeved on the housing (212) of the front carrier (21) or the rear carrier (22) and is threadedly connected to the front carrier (21) or the rear carrier (22).

5. The combined honeycomb carrier structure according to claim 4, characterized in that: A first sealing ring (44) is fixedly arranged on the housing (212) of the intermediate carrier (23), and a second sealing ring (43) capable of abutting against the first sealing ring (44) is fixedly arranged on the inner wall of the first connecting cylinder (41).

6. The combined honeycomb carrier structure according to claim 5, characterized in that: The outer diameter of the mounting ring (31) is smaller than the inner diameter of the first connecting cylinder (41), and the inner diameter of the mounting ring (31) is larger than the outer diameter of the housing (212) of the intermediate carrier (23), so that the mounting ring (31) can be inserted between the first connecting cylinder (41) and the housing (212) of the intermediate carrier (23). The end wall of the second connecting cylinder (42) can abut against one end wall of the mounting ring (31) and abut the other end wall against the first sealing ring (44).

7. The combined honeycomb carrier structure according to claim 1, characterized in that: The flow cross-sectional areas of the connecting cavity (551), the flow cavity (552) and the return cavity (553) are equal.

8. The combined honeycomb carrier structure according to claim 1, wherein: A mounting pipe (52) is fixedly arranged on the gas guide pipe (51). The housing (212) of the front carrier (21) can be inserted into the mounting pipe (52) and is threadedly connected to the mounting pipe (52).

9. The modular honeycomb carrier structure according to claim 8, characterized in that: A third sealing ring (53) is provided on the housing (212) of the front-end carrier (21), and the third sealing ring (53) can abut against the end wall of the mounting pipe (52).

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