Small box type postprocessor device

Abstract

The utility model discloses a small box type postprocessor device which comprises a postprocessor shell and a postprocessor assembly installed in the postprocessor shell, and the postprocessor assembly comprises an air inlet pipe, a DOC assembly, a DPF assembly, a DPF flow guide cavity, a urea mixing device, an SCR front flow guide cavity, an SCR / ASC assembly, an SCR rear flow guide cavity and an air outlet pipe. An end cover I is fixed to one end of the postprocessor shell, an end cover II is fixed to the other end of the postprocessor shell, and a partition plate is fixed to the postprocessor shell. The DOC carrier, the DPF carrier and the SCR / ASC carrier are all carriers with large single-channel diameter and short length, and a large-pipe-diameter mixing device is adopted, so that the size of the postprocessor is effectively reduced on the premise of ensuring low back pressure of the postprocessor. According to the scheme, an existing large-size box-type postprocessor on the market can be replaced, and the problem that the arrangement space of a whole vehicle is insufficient is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile accessories, in particular to a small box type post-processor device. Background Art

[0002] With the development of the times, users' main requirements for heavy-duty road vehicles are low fuel consumption, long driving range, high reliability, etc. Low fuel consumption requires low back pressure of the post-processor; long driving range requires small size of the post-processor, occupying as little space as possible in the vehicle.

[0003] The existing National VI post-processors mainly have box-type, U-type, and cylinder-type structures. Among them, the box-type post-processors are widely used in heavy-duty road vehicles due to their advantages such as small temperature loss and low back pressure. But at the same time, the box-type post-processors also have defects such as large size and difficulty in vehicle layout. Taking a 13L box-type National VI post-processor as an example, the back pressure of the post-processor is 26kPa, and the length of the post-processor is 750mm (in the direction of vehicle travel), which cannot meet the space layout requirements of the vehicle.

[0004] A Chinese patent with application number 202211370117.X was retrieved, which discloses a parallel dual-channel box-type after-processor device, in which the air inlet ends of the DOC cylinders of the two parallel-mounted DOC assemblies are connected to the air inlet diversion chamber, thereby dividing the gas into two parts and entering the DOC cylinder respectively, forming a dual-channel airflow flow, and two DPF assemblies are respectively arranged in the DOC cylinders of the DOC assemblies, and the air outlet ends of the DPF assemblies in the two parallel channels are both connected to the DPF confluence chamber, and the air outlet end of the mixer is connected to the SCR front diversion chamber, and the two SCR assemblies are arranged in parallel and the air inlet section is connected to the SCR front diversion chamber, and the air outlet ends are merged again and connected to the air outlet confluence chamber, and then discharged through the air outlet pipe; thus, through the dual-channel SCR arrangement, the emission of nitrogen oxides is greatly reduced, the National VI emission standard is met, and a useful exhaust back pressure reduction guarantee is provided for improving the thermal efficiency of the engine, thereby improving the exhaust gas processing capacity and the thermal efficiency of the engine. However, in the above-mentioned parallel dual-channel box-type post-processor device solution, DOC, DPF, and SCR are all dual-path parallel designs, and the post-processor is large in size and cannot meet the space layout requirements of the entire vehicle.

[0005] Therefore, a small box type post-processor device is proposed. Utility Model Content

[0006] The utility model aims to solve the problems raised in the background technology and provides a small box type post-processor device, which reduces the volume of the post-processor while ensuring low back pressure, and solves the problem of insufficient layout space of the whole vehicle.

[0007] The specific technical solutions are as follows:

[0008] A small box type post-processor device, comprising:

[0009] A post-processor housing is provided with a post-processor assembly, and the post-processor assembly includes: an intake pipe, a DOC assembly, a DPF assembly, a DPF flow guide cavity, a urea mixing device, an SCR front flow guide cavity, an SCR / ASC assembly, an SCR rear flow guide cavity and an exhaust pipe, wherein:

[0010] An end cap I is fixedly mounted on one end of the post-processor housing, an end cap II is fixedly mounted on the other end of the post-processor housing, and a partition is fixedly mounted on the post-processor housing;

[0011] One end of the air intake pipe is fixed on the outer side of the SCR front guide cavity, and the other end of the air intake pipe extends to the outside of the post-processor housing to communicate with the engine exhaust pipeline;

[0012] The DOC assembly is installed between the partition plate and the end cover II, and the interior of the DOC assembly is connected to the other end of the intake pipe;

[0013] One end of the DPF assembly passes through the end cover II and is embedded in the interior of the post-processor housing, and the interior of the DPF assembly is connected to the interior of the DOC assembly;

[0014] The DPF flow guide cavity is fixedly mounted on a side surface of the end cover II facing away from the after-processor housing, and the interior of the DPF flow guide cavity is connected to the interior of the DPF assembly;

[0015] The urea mixing device is installed between the partition plate and the end cover II, and the interior of the urea mixing device is connected to the interior of the DPF guide cavity;

[0016] The SCR front flow guide cavity is installed between the partition plate and the end cover 1, and the SCR front flow guide cavity is connected to the interior of the urea mixing device;

[0017] The SCR / ASC assembly is installed between the partition plate and the end cover II, and the interior of the SCR / ASC assembly is connected to the interior of the SCR front guide cavity;

[0018] The SCR rear flow guide cavity is fixedly mounted on a side surface of the end cover II facing away from the post-processor housing, and the interior of the SCR rear flow guide cavity is connected to the interior of the SCR / ASC assembly;

[0019] One end of the outlet pipe is fixedly passed through the end cover I and the partition and is fixedly installed on the end cover II, the interior of the outlet pipe is connected with the interior of the SCR rear guide cavity, and the other end of the outlet pipe extends to the outside of the end cover I.

[0020] As a preferred solution of the utility model, the DOC assembly includes a DOC carrier and a DOC shell, the DOC carrier and the DOC shell are respectively fixed on the partition and the end cover II, a gasket is provided between the DOC shell and the DOC carrier, the DOC shell adopts a variable diameter design and is designed with water drop-shaped concave ribs for supporting the DPF assembly.

[0021] As a preferred solution of the utility model, the DPF assembly includes a DPF carrier and a DPF shell, the DPF carrier and the DPF shell are respectively fixed on the concave rib of the DOC shell and the DPF guide cavity, a gasket is provided between the DPF shell and the DPF carrier, and a spun flange structure is designed at the end of the DPF shell, which cooperates with the DPF baffle, clamp and sealing gasket to realize the detachable function of the DPF assembly.

[0022] As a preferred solution of the present utility model, the SCR / ASC assembly includes an SCR carrier and an SCR / ASC carrier, and the SCR carrier and the SCR / ASC carrier are respectively fixed on the end cover II and the partition.

[0023] As a preferred solution of the utility model, the urea mixing device includes a mixing tube, a swirl tube and a urea nozzle seat, the urea nozzle seat is arranged at the air inlet end of the swirl tube, the mixing tube is arranged in the middle position inside the swirl tube, the air inlet end of the swirl tube is a conical structure, and is designed with a swirl sheet, and the airflow enters the urea mixing device through the swirl sheet and is fully mixed with the urea aqueous solution to ensure the uniformity of ammonia at the inlet of the SCR carrier.

[0024] As a preferred solution of the utility model, the back pressure of the post-processor is reduced, and the swirl tube is designed with a large tube diameter of 180 mm.

[0025] As a preferred solution of the utility model, the air outlet pipe is respectively fixed on the end cover I, the partition plate, and the end cover II to ensure strength and avoid a cantilever structure.

[0026] As a preferred solution of the utility model, the airflow exhausted by the engine passes through the intake pipe, DOC assembly, DPF assembly, DPF guide cavity, mixing device, SCR front guide cavity, SCR / ASC assembly, SCR rear guide cavity, and exhaust pipe in sequence and then discharged into the atmosphere.

[0027] As a preferred solution of the utility model, the intake pipe 1 adopts a variable-section special-shaped structure to reduce the volume occupied by the intake pipe; a plurality of exhaust holes are evenly distributed on the side of the intake pipe close to the end cover I, and the plurality of exhaust holes allow the airflow to first fill the cavity formed by the end cover I, the partition, and the post-processor housing, and then enter the DOC carrier, thereby ensuring uniform airflow distribution at the DOC carrier inlet.

[0028] As a preferred solution of the utility model, both ends of the intake pipe are respectively fixed to the after-processor housing and the SCR front guide cavity to ensure strength and avoid a cantilever structure.

[0029] As a preferred solution of the utility model, the DOC carrier, the DPF carrier and the SCR / ASC carrier all adopt a single-channel carrier with a diameter as large as 12 inches and a length of 3-15 cm to reduce the back pressure of the post-processor. Compared with the multi-channel carrier arrangement solution, it can effectively reduce the volume of the post-processor.

[0030] The utility model has the following beneficial effects:

[0031] The utility model provides a small box-type post-processor device. The DOC carrier, DPF carrier and SCR / ASC carrier all adopt a single-channel carrier with a large diameter and a short length, and adopt a large-diameter mixing device. Under the premise of ensuring the low back pressure of the post-processor, the volume of the post-processor is effectively reduced. The utility model can replace the existing large-volume box-type post-processors on the market and solve the problem of insufficient space for vehicle layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is the axonometric drawing of the small and medium-sized box-type post-processor of the utility model;

[0033] Figure 2 This is a cross-sectional view of a small and medium-sized box-type post-processor of the utility model (cut from the cross section formed by the center line of the DOC assembly and the mixing device);

[0034] Figure 3 This is a cross-sectional view of a small to medium-sized box-type after-processor of the utility model (cut from the cross section formed by the center line of the SCR / ASC assembly and the exhaust pipe).

[0035] In the attached figure:

[0036] 1. Intake pipe; 2. End cover I; 3. SCR front guide cavity; 4. Partition; 5. Mixing device; 5.1. Mixing tube; 5.2. Swirl tube; 5.3. Urea nozzle seat; 6. End cover II; 7. DPF guide cavity; 8. DPF assembly; 8.1. DPF carrier; 8.2. DPF shell; 9. Clamp; 10. DPF baffle; 11. SCR rear guide cavity; 12. SCR / ASC assembly; 12.1. SCR carrier; 12.2. SCR / ASC carrier; 13. DOC assembly; 13.1. DOC carrier; 13.2. DOC shell; 14. Exit pipe; 15. Post-processor shell. DETAILED DESCRIPTION

[0037] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0038] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on this patent; in order to better illustrate the embodiments of the utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0039] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0040] In the description of the present invention, unless otherwise clearly specified and limited, if the term "connection" or the like appears to indicate the connection relationship between components, the term should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Example

[0042] The small box type post-processor device provided in this embodiment is as follows: Figure 1-Figure 3As shown, it includes: a post-processor housing 15, a post-processor assembly is arranged in the post-processor housing 15, and the post-processor assembly includes: an intake pipe 1, a DOC assembly 13, a DPF assembly 8, a DPF guide cavity 7, a urea mixing device 5, an SCR front guide cavity 3, an SCR / ASC assembly 12, an SCR rear guide cavity 11 and an outlet pipe 14, wherein:

[0043] An end cap I2 is fixedly mounted on one end of the post-processor housing 15, an end cap II6 is fixedly mounted on the other end of the post-processor housing 15, and a partition plate 4 is fixedly mounted on the post-processor housing 15;

[0044] One end of the intake pipe 1 is fixed on the outer surface of the SCR front guide cavity 3, and the other end of the intake pipe 1 extends to the outside of the post-processor housing 15 and is connected to the engine exhaust pipeline;

[0045] The DOC assembly 13 is installed between the partition plate 4 and the end cover II6, and the interior of the DOC assembly 13 is connected to the other end of the intake pipe 1;

[0046] One end of the DPF assembly 8 is embedded in the interior of the post-processor housing 15 through the end cover II6, and the interior of the DPF assembly 8 is connected to the interior of the DOC assembly 13;

[0047] The DPF flow guide cavity 7 is fixedly mounted on a side surface of the end cover II6 facing away from the after-processor housing 15, and the interior of the DPF flow guide cavity 7 is connected to the interior of the DPF assembly 8;

[0048] The urea mixing device 5 is installed between the partition plate 4 and the end cover II6, and the interior of the urea mixing device 5 is connected to the interior of the DPF guide cavity 7;

[0049] The SCR front flow guiding cavity 3 is installed between the partition plate 4 and the end cover 12, and the SCR front flow guiding cavity 3 is connected with the interior of the urea mixing device 5;

[0050] The SCR / ASC assembly 12 is installed between the partition plate 4 and the end cover II6, and the interior of the SCR / ASC assembly 12 is connected to the interior of the SCR front guide cavity 3;

[0051] The SCR rear guide cavity 11 is fixedly mounted on a side surface of the end cover II6 facing away from the post-processor housing 15, and the interior of the SCR rear guide cavity 11 is connected to the interior of the SCR / ASC assembly 12;

[0052] One end of the outlet pipe 14 is fixedly passed through the end cover I2 and the partition 4 and is fixedly installed on the end cover II6. The interior of the outlet pipe 14 is connected to the interior of the SCR rear guide cavity 11, and the other end of the outlet pipe 14 extends to the outside of the rear end cover I2.

[0053] Among them, the airflow exhausted by the engine passes through the intake pipe 1, DOC assembly 13, DPF assembly 8, DPF guide cavity 7, mixing device 5, SCR front guide cavity 3, SCR / ASC assembly 12, SCR rear guide cavity 11, and exhaust pipe 14 in sequence and then discharged into the atmosphere, which can effectively ensure the quality of exhaust gas treatment.

[0054] Specifically, in this embodiment, the DOC assembly 13 includes a DOC carrier 13.1 and a DOC shell 13.2. The DOC carrier 13.1 and the DOC shell 13.2 are respectively fixed on the partition 4 and the end cover II6. There is a gasket between the DOC shell 13.2 and the DOC carrier 13.1. The DOC shell 13.2 adopts a variable diameter design and is designed with water drop-shaped concave ribs for supporting the DPF assembly 8.

[0055] Specifically, in this embodiment, the DPF assembly 8 includes a DPF carrier 8.1 and a DPF shell 8.2. The DPF carrier 8.1 and the DPF shell 8.2 are respectively fixed on the concave ribs of the DOC shell 13.2 and the DPF guide cavity 7. A gasket is provided between the DPF shell 8.2 and the DPF carrier 8.1. A spun flange structure is designed at the end of the DPF shell 8.2, which cooperates with the DPF baffle 10, the clamp 9 and the sealing gasket to realize the detachable function of the DPF assembly 8.

[0056] Specifically, in this embodiment, the SCR / ASC assembly 12 includes an SCR carrier 12.1 and an SCR / ASC carrier 12.2, and the SCR carrier 12.1 and the SCR / ASC carrier 12.2 are fixed on the end cover II6 and the partition plate 4 respectively.

[0057] Specifically, in the present embodiment, the urea mixing device 5 comprises a mixing tube 5.1, a swirl tube 5.2 and a urea nozzle seat 5.3. The urea nozzle seat 5.3 is arranged at the air inlet end of the swirl tube 5.2, and the mixing tube 5.1 is arranged at the middle position inside the swirl tube 5.2. The air inlet end of the swirl tube 5.2 is a conical structure and is designed with a swirl sheet. After the air flow passes through the swirl sheet and enters the urea mixing device 5, it is fully mixed with the urea aqueous solution to ensure the uniformity of ammonia at the inlet of the SCR carrier 12.1.

[0058] Specifically, in this embodiment, in order to reduce the back pressure of the post-processor, the cyclone tube 5.2 is designed with a large tube diameter of 180 mm.

[0059] Specifically, in this embodiment, the air outlet pipe 14 is fixed to the end cover I2, the partition plate 4, and the end cover II6 respectively, which can ensure the strength and avoid the formation of a cantilever structure.

[0060] Specifically, in the present embodiment, the air intake pipe 1 adopts a variable-section special-shaped structure, which can reduce the volume occupied by the air intake pipe; a plurality of exhaust holes are evenly distributed on the side of the air intake pipe 1 close to the end cover 12, and the plurality of exhaust holes allow the airflow to first fill the cavity formed by the end cover 12, the partition 4, the post-processor housing 15 and the post-processor housing 15, and then enter the DOC carrier 13.1, thereby ensuring that the airflow at the inlet of the DOC carrier 13.1 is evenly distributed.

[0061] Specifically, in this embodiment, both ends of the intake pipe 1 are respectively fixed to the post-processor housing 15 and the SCR front guide cavity 3, which can ensure strength and avoid the occurrence of a cantilever structure.

[0062] Specifically, in this embodiment, the DOC carrier 13.1, the DPF carrier 8.1 and the SCR / ASC carrier 12.2 all use a single-channel carrier with a diameter as large as 12 inches and a length of 3-15 cm, which can effectively reduce the back pressure of the post-processor. Compared with the multi-channel carrier arrangement scheme, it can effectively reduce the volume of the post-processor.

[0063] In summary, the small box type post-processor device provided in this embodiment has the following advantages:

[0064] The utility model provides a small box-type post-processor device. The DOC carrier 13.1, the DPF carrier 8.1 and the SCR / ASC carrier 12.2 all use a single-channel carrier with a large diameter and a short length, and a large-diameter mixing device. Under the premise of ensuring the low back pressure of the post-processor, the volume of the post-processor is effectively reduced. The utility model can replace the existing large-volume box-type post-processors on the market and solve the problem of insufficient space for vehicle layout.

[0065] The above are only preferred embodiments of the present invention, and do not limit the implementation mode and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A small box post-processor device, characterized in that: include: A post-processor housing (15) is provided with a post-processor assembly inside the post-processor housing (15), the post-processor assembly comprising: an intake pipe (1), a DOC assembly (13), a DPF assembly (8), a DPF flow guide cavity (7), a urea mixing device (5), an SCR front flow guide cavity (3), an SCR / ASC assembly (12), an SCR rear flow guide cavity (11) and an outlet pipe (14), wherein: An end cover I (2) is fixedly mounted on one end of the post-processor housing (15), an end cover II (6) is fixedly mounted on the other end of the post-processor housing (15), and a partition plate (4) is fixedly mounted on the post-processor housing (15); One end of the intake pipe (1) is fixed on the outer surface of the SCR front guide cavity (3), and the other end of the intake pipe (1) extends to the outside of the post-processor housing (15) and is connected to the engine exhaust pipeline; The DOC assembly (13) is installed between the partition plate (4) and the end cover II (6), and the interior of the DOC assembly (13) is connected to the other end of the intake pipe (1); One end of the DPF assembly (8) passes through the end cover II (6) and is embedded in the interior of the post-processor housing (15), and the interior of the DPF assembly (8) is connected to the interior of the DOC assembly (13); The DPF flow guide cavity (7) is fixedly mounted on a side surface of the end cover II (6) facing away from the post-processor housing (15), and the interior of the DPF flow guide cavity (7) is connected to the interior of the DPF assembly (8); The urea mixing device (5) is installed between the partition plate (4) and the end cover II (6), and the interior of the urea mixing device (5) is connected to the interior of the DPF guide cavity (7); The SCR front flow guiding cavity (3) is installed between the partition plate (4) and the end cover 1 (2), and the SCR front flow guiding cavity (3) is connected to the interior of the urea mixing device (5); The SCR / ASC assembly (12) is installed between the partition (4) and the end cover II (6), and the interior of the SCR / ASC assembly (12) is connected to the interior of the SCR front guide cavity (3); The SCR rear flow guide cavity (11) is fixedly mounted on a side surface of the end cover II (6) facing away from the post-processor housing (15), and the interior of the SCR rear flow guide cavity (11) is connected to the interior of the SCR / ASC assembly (12); One end of the outlet pipe (14) is fixedly passed through the end cover I (2) and the partition (4) and is fixedly mounted on the end cover II (6); the interior of the outlet pipe (14) is connected to the interior of the SCR rear guide cavity (11), and the other end of the outlet pipe (14) extends to the outside of the end cover I (2).

2. The small box post-processor device according to claim 1, characterized in that: The DOC assembly (13) comprises a DOC carrier (13.1) and a DOC shell (13.2); the DOC carrier (13.1) and the DOC shell (13.2) are respectively fixed on the partition (4) and the end cover II (6); a gasket is provided between the DOC shell (13.2) and the DOC carrier (13.1); the DOC shell (13.2) adopts a variable diameter design and is provided with a water drop-shaped concave rib for supporting the DPF assembly (8).

3. The small box type post-processor device according to claim 2, characterized in that: The DPF assembly (8) comprises a DPF carrier (8.1) and a DPF shell (8.2); the DPF carrier (8.1) and the DPF shell (8.2) are respectively fixed to the concave rib of the DOC shell (13.2) and the DPF flow guide cavity (7); a gasket is provided between the DPF shell (8.2) and the DPF carrier (8.1); and a spun flange structure is designed at the end of the DPF shell (8.2).

4. The small box type post-processor device according to claim 3, characterized in that: The SCR / ASC assembly (12) comprises an SCR carrier (12.1) and an SCR / ASC carrier (12.2), wherein the SCR carrier (12.1) and the SCR / ASC carrier (12.2) are respectively fixed on the end cover II (6) and the partition plate (4).

5. The small box type post-processor device according to claim 4, characterized in that: The urea mixing device (5) comprises a mixing tube (5.1), a swirl tube (5.2) and a urea nozzle seat (5.3); the urea nozzle seat (5.3) is arranged at the air inlet end of the swirl tube (5.2); the mixing tube (5.1) is arranged at the middle position inside the swirl tube (5.2); the air inlet end of the swirl tube (5.2) is a conical structure and is designed with a swirl sheet.

6. The small box type post-processor device according to claim 5, characterized in that: The cyclone tube (5.2) is designed with a large tube diameter of 180 mm.

7. The small box type post-processor device according to claim 6, characterized in that: The air outlet pipe (14) is respectively fixed on the end cover I (2), the partition plate (4) and the end cover II (6).

8. The small box type post-processor device according to claim 6, characterized in that: A plurality of exhaust holes are evenly distributed on one side of the air inlet pipe (1) close to the end cover I (2).

9. The small box type post-processor device according to claim 6, characterized in that: The two ends of the air intake pipe (1) are respectively fixed on the post-processor housing (15) and the SCR front flow guide cavity (3).

10. The small box type post-processor device according to claim 6, characterized in that: The DOC carrier (13.1), the DPF carrier (8.1) and the SCR / ASC carrier (12.2) all adopt a single-channel carrier with a diameter of 12 inches and a length of 3-15 cm.

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