Non-road motor vehicle engine tail gas after-treatment system

Abstract

The utility model discloses a non-road motor vehicle engine tail gas aftertreatment system which is used for treating non-road motor vehicle engine tail gas. The after-treatment device comprises a first after-treatment device, a second after-treatment device, a mixer pipe and a urea nozzle, the second after-treatment device is communicated with an exhaust pipe for exhausting tail gas after combustion of an engine, the first after-treatment device is communicated with the second after-treatment device through the mixer pipe, the urea nozzle is arranged on the mixer pipe, and the urea nozzle is communicated with the first after-treatment device through the mixer pipe. And the urea nozzle is used for spraying urea into the mixer pipe.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to an exhaust gas aftertreatment system for a non-road motor vehicle engine. Background Art

[0002] In recent years, the emission standards for motor vehicles have become increasingly stringent around the world, especially in non-road applications such as loaders and harvesters. In order to meet the requirements of these regulations, the engine exhaust after-treatment system is particularly important. Among them, the selection of a suitable mixer and its reasonable structural design are crucial to the performance of the system.

[0003] As an important part of the engine, the post-processing system has the main function of implementing exhaust gas treatment to ensure that the vehicle's emissions meet the regulations by targeting the pollutant emission limits specified in national emission regulations. At present, countries adopt regulations of different stages and standards, such as National III, National IV, National V, National VI, India IV, Brazil III, Euro V, Euro VI, etc. The post-processor is usually composed of a carrier, coating, packaging, sensors, etc.

[0004] Most vehicle aftertreatment systems are installed on the vehicle in a suitable position. However, for some off-road vehicles, such as loaders and harvesters, the aftertreatment must be installed on the engine due to limited space in the vehicle. Therefore, engine companies need to provide practical and reliable aftertreatment installation solutions to meet the needs of vehicle companies while minimizing changes in the vehicle structure.

[0005] The post-treatment mixer or mixing section is a key component of the post-treatment system. Its main function is to mix ammonia and have a certain muffler function. However, the unevenness of the mixing (including speed and ammonia concentration) may lead to insufficient ammonia in local areas, thereby reducing the NOx conversion rate. Conversely, excessive ammonia in local areas may lead to increased ammonia leakage and may even cause urea crystal blockage.

[0006] Therefore, a properly designed SCR system structure is crucial. This reasonable design can not only improve the utilization of the catalyst, but also reduce the resistance along the exhaust. In the design, the shape and position of the mixer need to be considered to ensure the uniformity and efficiency of the mixing. In addition, the system structure design also needs to comprehensively consider the supply and mixing process of ammonia to avoid the problem of insufficient or excessive ammonia.

[0007] In the existing technology, the after-treatment system often uses a fixed method to install various components on the vehicle. However, for some non-road vehicles, the space is limited, and this traditional design method may make structural adjustment more difficult. At the same time, the mixing efficiency and gas reaction uniformity of the after-treatment system are also one of the challenges faced by current technology. Utility Model Content

[0008] The present application provides an after-treatment system for engine exhaust gas of a non-road motor vehicle. The technical solution in the present application is described below:

[0009] The present application provides a non-road motor vehicle engine exhaust aftertreatment system, comprising:

[0010] A first after-treatment device, a second after-treatment device, a mixer pipe and a urea nozzle, wherein the second after-treatment device is connected to an exhaust pipe for exhaust gas discharged after combustion of an engine, the first after-treatment device is connected to the second after-treatment device through the mixer pipe, and the urea nozzle is arranged on the mixer pipe, and the urea nozzle is used to spray urea into the mixer pipe.

[0011] Optionally, the angle between the injection direction of the urea nozzle and the air flow direction in the mixer pipe is 30 degrees.

[0012] Optionally, a nozzle mounting seat is provided on the mixer pipe, and the urea nozzle is mounted on the nozzle mounting seat.

[0013] Optionally, a first fixed bracket is further included, and the first post-processing device is fixed on the first fixed bracket through a movable clamp.

[0014] Optionally, a second fixed bracket is further included, and the second post-processing device is fixed on the second fixed bracket through a movable clamp.

[0015] Optionally, it also includes a post-turbine pipe, and the second after-treatment device is connected to the exhaust pipe through the post-turbine pipe.

[0016] Optionally, a buffer block is provided between the first fixing bracket and the first post-processing device.

[0017] Optionally, a buffer block is provided between the second fixing bracket and the second post-processing device.

[0018] Optionally, the mixer tube is in an "S" shape, and the urea nozzle is arranged at the bend of the "S" shape.

[0019] It can be seen from the above technical solutions that this application has the following advantages:

[0020] 1. The dual post-processing system includes a first post-processing device and a second post-processing device, which can more fully purify the exhaust gas emitted by the engine, thereby helping to ensure that the emission complies with more stringent regulatory standards of a country or region.

[0021] 2. The mixer tube is used to connect the first post-treatment device and the second post-treatment device. The mixer tube can promote more complete mixing of exhaust gas and urea and improve the mixing efficiency, which helps to increase the utilization rate of urea and improve the conversion efficiency of nitrogen oxides (NOx).

[0022] 3. The urea nozzle is set on the mixer tube to spray urea into the mixer tube. This design can ensure that urea fully participates in the mixing process, promoting efficient reduction reaction of ammonia and nitrogen oxides in the exhaust gas. Timely injection of urea helps maintain the appropriate ammonia concentration in the mixer tube to maximize the performance of the catalyst.

[0023] 4. The design of this system takes into account the special needs of off-road vehicles, especially those with limited space. Through reasonable structural design, the impact on the vehicle structure is minimized to meet the actual use requirements of off-road vehicles.

[0024] 5. By adopting this dual after-treatment system and through the reasonable design of the mixer pipe and urea nozzle, the system is expected to better meet the requirements of national or regional emission regulations, protect the environment and improve the environmental performance of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of an embodiment of a non-road motor vehicle engine exhaust after-treatment system provided in this application;

[0026] Figure 2 This is a schematic structural diagram of another embodiment of the non-road motor vehicle engine exhaust after-treatment system provided in the present application;

[0027] Figure 3 The present invention is a schematic structural diagram of an embodiment of a mixer tube in an exhaust gas after-treatment system for a non-road motor vehicle engine provided in the present application. DETAILED DESCRIPTION

[0028] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only used to illustrate the relative positional relationships between the various components or components, and do not particularly limit the specific installation orientations of the various components or components.

[0029] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0030] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two systems, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] In addition, the structures, proportions, sizes, etc. drawn in the drawings in the present application are only used to match the contents disclosed in the specification so as to facilitate the understanding and reading of those skilled in the art, and are not used to limit the restrictive conditions under which the present application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present application without affecting the effects and purposes that can be achieved by the present application.

[0032] The following will be combined with the drawings in this application to clearly and completely describe the technical solutions in this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] See also Figures 1 to 3 :

[0034] The present application provides a non-road motor vehicle engine exhaust aftertreatment system, comprising:

[0035] A first after-treatment device 01, a second after-treatment device 02, a mixer pipe 03 and a urea nozzle 04, wherein the second after-treatment device 02 is connected to an exhaust pipe 05 for exhaust gas discharged after engine combustion, the first after-treatment device 01 is connected to the second after-treatment device 02 through the mixer pipe 03, and the urea nozzle 04 is arranged on the mixer pipe 03, and the urea nozzle 04 is used to spray urea into the mixer pipe 03.

[0036] The non-road motor vehicle engine exhaust after-treatment system provided in this application is a system composed of a dual after-treatment device, a mixer pipe 03 and a urea nozzle 04, which is intended to effectively purify the exhaust gas emitted after engine combustion to meet national or regional emission regulations. The following is a detailed description of each part of the system:

[0037] First post-treatment device 01: This is a layer of exhaust gas treatment device in the system, responsible for the initial purification of a portion of the exhaust gas. It may involve processes such as redox reactions to reduce the concentration of harmful substances such as nitrogen oxides (NOx).

[0038] The second post-treatment device 02 is connected to the exhaust pipe 05 of the engine after combustion, and is another exhaust treatment device of the system. The design of the second post-treatment device 02 may include a more efficient catalyst system to further purify the residual harmful gases and ensure that the emissions meet more stringent emission regulations.

[0039] Mixer pipe 03: A pipe connecting the first post-treatment device 01 and the second post-treatment device 02, playing an important role in mixing exhaust gas and urea. The design of the mixer pipe 03 can adopt an S-shaped channel, which helps to promote gas mixing and optimize the mixing speed. This design improves the uniform mixing of ammonia and exhaust gas and improves the utilization rate of ammonia.

[0040] Urea nozzle 04: The urea nozzle 04 disposed on the mixer tube 03 is responsible for spraying urea into the mixer tube 03. The amount and timing of urea spraying can be precisely controlled to ensure that urea is fully mixed with the exhaust gas during the mixing process to form ammonia of a suitable concentration, thereby promoting the subsequent efficient catalytic reduction reaction.

[0041] The whole system aims to improve the utilization rate of the catalyst, reduce the resistance along the exhaust, and minimize the impact on the vehicle structure while meeting the emission regulations through this reasonable design and the coordinated work of components. This non-road motor vehicle engine exhaust after-treatment system has significant advantages in environmental performance and vehicle efficiency.

[0042] In an optional embodiment, the angle between the injection direction of the urea nozzle 04 and the air flow direction in the mixer pipe 03 is 30 degrees.

[0043] In this optional embodiment, the design of the urea nozzle 04 has a specific angle setting of 30 degrees to the air flow direction in the mixer pipe 03. The purpose of this design is to optimize the injection direction of urea so that urea and exhaust gas are mixed more effectively.

[0044] The angle of 30 degrees helps to form effective mixing between the urea solution and the airflow sprayed by the urea nozzle 04. The selection of this angle can promote the full intersection of urea and the airflow, improve the mixing efficiency, and ensure the mixing uniformity.

[0045] By spraying urea at an angle of 30 degrees, a more uniform distribution of urea can be achieved in the mixer tube 03. This helps prevent the ammonia concentration in a local area from being too low or too high, thereby maintaining the uniformity of the reaction.

[0046] The 30-degree angle design helps maximize the mixing and reaction between urea and exhaust gases. This design is expected to improve the utilization rate of ammonia and increase the catalyst's purification effect on harmful substances.

[0047] The angle of 30 degrees may help to form a more streamlined mixed gas flow, reduce the mixing resistance between ammonia and exhaust gas, and further improve the mixing effect. The design of this optional embodiment achieves the best match between the urea nozzle 04 and the air flow in the mixer pipe 03 through reasonable angle selection, thereby improving the overall performance of the system.

[0048] In an optional embodiment, a nozzle mounting seat 06 is provided on the mixer pipe 03 , and the urea nozzle 04 is mounted on the nozzle mounting seat 06 .

[0049] In this optional embodiment, the design of the mixer pipe 03 introduces a nozzle mount 06, and the urea nozzle 04 is mounted on this nozzle mount 06. This design has the following advantages:

[0050] The nozzle mount 06 provides a fixed position to ensure that the urea nozzle 04 is firmly mounted on the mixer pipe 03. This helps prevent the nozzle position from becoming unstable due to vibration or other factors during vehicle operation.

[0051] The nozzle mount 06 provides a convenient location, making it easier to maintain and replace the urea nozzle 04. This is an important factor for the maintainability and reliability of the system.

[0052] The nozzle mount 06 ensures that the urea nozzle 04 is accurately positioned on the mixer pipe 03, so that the injection direction and angle of the nozzle can be precisely controlled, which helps to optimize the mixing effect and reaction efficiency.

[0053] By firmly installing the urea nozzle 04, the risk of urea solution leakage can be reduced. This is crucial to avoid unnecessary ammonia overflow and urea crystal blockage.

[0054] The introduction of the nozzle mount 06 is expected to improve the performance of the entire system, making the injection and mixing of urea more precise and efficient, thereby improving the utilization of the catalyst and the purification effect of the system.

[0055] In an optional embodiment, it further includes a first fixed bracket 07 , and the first post-processing device is fixed on the first fixed bracket 07 via a movable clamp 08 .

[0056] In an optional embodiment, it further includes a second fixed bracket 09, and the second post-processing device is fixed on the second fixed bracket 09 via a movable clamp.

[0057] In this optional embodiment, the system further includes a first fixed bracket 07 and a second fixed bracket 09 for supporting the first post-processing device and the second post-processing device. The two fixed brackets fix the corresponding post-processors through another movable clamp, providing a more flexible and adjustable installation structure for the system.

[0058] The first fixing bracket 07 is used to support the first post-processing device. The design of this bracket enables the first post-processing device to be firmly fixed on the vehicle, and at the same time, through the adjustment of the movable clamp 08, it can be moved and adjusted within a certain range.

[0059] The first post-processing device movable clamp: The clamp installed on the first fixed bracket 07 is movable, allowing the position of the first post-processing device to be adjusted when necessary. This adjustable design allows the system to adapt to the needs of different vehicle models and structures, and improves the adaptability and installation flexibility of the system.

[0060] Second fixing bracket 09: A fixing bracket for supporting the second post-processing device. Similar to the first fixing bracket 07, the design of the second fixing bracket 09 also allows the second post-processing device to be firmly fixed and adjusted in position through a movable clamp.

[0061] Another movable clamp The clamp mounted on the second fixed bracket 09 is also movable, allowing the position of the second post-processing device to be flexibly adjusted when needed. This adjustable structure improves the customizability of the entire system to adapt to various vehicle structures and space constraints.

[0062] By introducing the design of these two fixed brackets and movable clamps, the system's post-processor can be flexibly adjusted and installed according to actual needs. This design not only improves the adjustability of the system, but also helps to reduce the impact of changes in the vehicle structure and meet the needs of different models and space restrictions.

[0063] In an optional embodiment, it further includes a post-turbine pipe 10 , and the second after-treatment device is connected to the exhaust pipe 05 through the post-turbine pipe 10 .

[0064] In this optional embodiment, the system further comprises a post-turbine pipe 10, which connects the second post-treatment device 02 and the exhaust pipe 05. This design helps to optimize the airflow and improve the efficiency of the post-treatment system.

[0065] The vortex after-pipe 10 connects the second after-treatment device 02 and the exhaust pipe 05, and acts as a connecting element. It adopts a uniquely designed shape to promote the vortex effect when the exhaust flow passes through the vortex after-pipe 10. This helps to improve the flow characteristics of the gas, improve the mixing efficiency and the uniformity of the gas reaction.

[0066] The second post-treatment device 02 is connected to the exhaust pipe 05 through the vortex post-tube 10. This connection mode allows the exhaust gas to pass through an optimized vortex area before passing through the second post-treatment device 02, which is helpful for mixing and dispersing ammonia and other components in the exhaust gas.

[0067] The design of this optional embodiment aims to optimize the flow of exhaust gas through the introduction of the after-turbine pipe 10, thereby improving the performance of the second after-treatment device 02. This helps to improve the mixing uniformity of ammonia and further improve the overall efficiency and performance of the system.

[0068] In an optional embodiment, a buffer block 11 is provided between the first fixing bracket 07 and the first post-processing device.

[0069] In an optional embodiment, a buffer block 11 is provided between the second fixing bracket 09 and the second post-processing device.

[0070] In this optional embodiment, the system design further includes providing a buffer pad 11 between the first fixed bracket 07 and the first post-processing device, and providing a buffer pad 11 between the second fixed bracket 09 and the second post-processing device. This design helps to reduce the impact of vibration and shock on the post-processor and improve the stability and durability of the system.

[0071] Buffer blocks 11 are provided between the first fixing bracket 07 and the first post-processing device. These blocks may be made of elastic materials, such as rubber or elastic plastic. Their main function is to absorb and mitigate energy from vibration and impact, thereby effectively reducing the negative impact on the first post-processing device.

[0072] Similarly, buffer pads 11 are also arranged between the second fixing bracket 09 and the second post-processing device. These pads also have the functions of shock absorption and buffering, which help to protect the second post-processing device from damage caused by external vibration and impact.

[0073] In an optional embodiment, the mixer pipe 03 is in an "S" shape, and the urea nozzle 04 is disposed at the bend of the "S" shape.

[0074] In this optional embodiment, the mixer pipe 03 is designed in an "S" shape, and the urea nozzle 04 is arranged at the bend of the "S". Such a design helps to optimize the injection position of urea, improve the mixing efficiency, and ensure that ammonia and exhaust gas are fully mixed.

[0075] "S" shaped mixer pipe 03: The design of the mixer pipe 03 adopts an "S" shape, which may include one or more curved bends. This "S" shaped design can not only optimize the layout of the mixer pipe 03, but also improve the flow characteristics of the exhaust gas in the pipe, which helps to improve the mixing efficiency.

[0076] The urea nozzle 04 is installed at the bend of the "S"-shaped mixer pipe 03. This position may be chosen to make full use of the vortex effect of the airflow at the bend to promote the full mixing of urea and exhaust gas. By setting it at the bend, the injected urea can better intersect with the gas flowing through the pipe.

[0077] The design of this optional embodiment aims to improve the mixing efficiency of urea and ensure the uniformity of mixing by optimizing the shape of the mixer pipe 03. The location of the urea nozzle 04 further emphasizes the special advantages at the bend, which can improve the overall performance and efficiency of the system.

[0078] In order to more clearly illustrate the structure in the present application, other components of the engine are introduced in the drawings of the present application specification. The other components involved in each drawing are introduced below, among which:

[0079] The air filter 12 is mounted on the filter bracket 13 , a support pad 14 is provided on the first fixed bracket 07 , and the engine body includes a cylinder block 18 , a cylinder head 17 , a cylinder head cover 15 , a flywheel housing 16 and a supercharger 19 .

[0080] It should be noted that the above description of the disclosed embodiments enables professionals and technicians in the field to implement or use the present application. Various modifications to these embodiments will be apparent to professionals and technicians in the field, and the general principles defined herein can be implemented in other embodiments without departing from the scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A non-road motor vehicle engine exhaust after-treatment system, characterized in that: include: A first after-treatment device, a second after-treatment device, a mixer pipe and a urea nozzle, wherein the second after-treatment device is connected to an exhaust pipe for exhaust gas discharged after combustion of an engine, the first after-treatment device is connected to the second after-treatment device through the mixer pipe, and the urea nozzle is arranged on the mixer pipe, and the urea nozzle is used to spray urea into the mixer pipe.

2. The non-road vehicle engine exhaust after-treatment system according to claim 1, characterized in that: The included angle between the injection direction of the urea nozzle and the air flow direction in the mixer pipe is 30 degrees.

3. The non-road vehicle engine exhaust after-treatment system according to claim 1, characterized in that: The mixer pipe is provided with a nozzle mounting seat, and the urea nozzle is mounted on the nozzle mounting seat.

4. The non-road vehicle engine exhaust after-treatment system according to claim 1, characterized in that: It also includes a first fixing bracket, and the first post-processing device is fixed on the first fixing bracket through a movable clamp.

5. The non-road vehicle engine exhaust after-treatment system according to claim 1, characterized in that: It also includes a second fixing bracket, and the second post-processing device is fixed on the second fixing bracket through a movable clamp.

6. The non-road vehicle engine exhaust after-treatment system according to claim 1, characterized in that: It also includes a post-turbine pipe, through which the second after-treatment device is connected to the exhaust pipe.

7. The non-road vehicle engine exhaust after-treatment system according to claim 4, characterized in that: A buffer block is arranged between the first fixing bracket and the first post-processing device.

8. The non-road vehicle engine exhaust after-treatment system according to claim 5, characterized in that: A buffer block is arranged between the second fixing bracket and the second post-processing device.

9. The non-road vehicle engine exhaust after-treatment system according to claim 1, characterized in that: The mixer pipe is in an "S" shape, and the urea nozzle is arranged at the bend of the "S" shape.

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