Diesel engine aftertreatment efficient urea mixing device

Abstract

The diesel engine aftertreatment efficient urea mixing device comprises a mixer unit, a nozzle mounting base, a temperature mounting base, a pressure mounting base, a mixer barrel and a mixer pore plate, the mixer barrel is of a barrel-shaped structure, the mixer pore plate is a circular pore plate, and the mixer pore plate is mounted at the rear opening end of the mixer barrel; the mixer unit is mounted in the mixer barrel, the nozzle mounting seat is mounted on the barrel wall of the mixer barrel, the temperature mounting seat is mounted on the side surface of the barrel wall at the front end of the mixer barrel, and the pressure mounting seat is mounted on the side surface of the barrel wall at the front end of the mixer barrel. The diesel engine post-treatment efficient urea mixing device is good in emission performance, high in crystallization resistance, high in heat utilization rate and uniform in mixer airflow distribution, evaporation and pyrolysis of urea are facilitated, and the crystallization risk is reduced; meanwhile, the mixer is high in heat utilization rate, the inner surface and the outer surface of the lower baffle of the mixer can be heated by airflow during use, and evaporation and pyrolysis of urea are facilitated.

Description

Technical Field

[0001] The present invention relates to the field of motor vehicle catalytic muffler components, in particular to the field of a mixing structure device that is conducive to the full mixing and thermal decomposition of a urea aqueous solution and exhaust gas, specifically to a diesel engine aftertreatment high-efficiency urea mixing device. Background Art

[0002] At present, the constantly upgraded emission regulations are becoming more and more stringent. The full implementation of the current new emission regulations has led to the integration and structure of catalytic muffler components for motor vehicles becoming more and more complex. In particular, in order to further reduce fuel consumption, some engines have cancelled the EGR system, resulting in higher original emissions. As a result, the emission performance of catalytic muffler components is unstable and easy to crystallize, making development difficult, especially in medium and heavy-duty commercial vehicles. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a diesel engine after-treatment high-efficiency urea mixing device with good emission performance, strong anti-crystallization ability, compact structure, better versatility and applicability.

[0004] In order to achieve the above object, the diesel engine aftertreatment high-efficiency urea mixing device of the present invention is as follows:

[0005] The diesel engine aftertreatment high-efficiency urea mixing device has the following main features: the device includes a mixer unit, a nozzle mounting seat, a temperature mounting seat, a pressure mounting seat, a mixer barrel and a mixer orifice plate; the mixer unit, the nozzle mounting seat, the temperature mounting seat, the pressure mounting seat, the mixer barrel and the mixer orifice plate are installed to form a mixer assembly; the mixer barrel is a cylindrical structure; the mixer orifice plate is a circular orifice plate; the mixer orifice plate is installed at the rear open end of the mixer barrel; the mixer unit is installed inside the mixer barrel; the nozzle mounting seat is installed on the barrel wall of the mixer barrel; the temperature mounting seat is installed on the barrel wall side of the front end of the mixer barrel; and the pressure mounting seat is installed on the barrel wall side of the front end of the mixer barrel.

[0006] Preferably, the mixer unit comprises a first mixer unit, wherein the first mixer unit, the nozzle mounting seat, the temperature mounting seat, the pressure mounting seat, the mixer barrel and the mixer orifice plate are installed to form a first mixer assembly;

[0007] The first mixer unit includes a mixer upper baffle, a swirl tube, a wire mesh assembly, a mixer lower baffle and a mixer rear baffle. The bottom of the mixer lower baffle is provided with an airflow channel, the top middle of the mixer rear baffle is provided with a circular opening, and the rear of the circular opening of the mixer rear baffle is provided with an airflow channel. The mixer rear baffle is installed on the mixer lower baffle, and the top of the mixer rear baffle is placed above the mixer lower baffle. The wire mesh assembly is installed on the mixer lower baffle and is located in the circular opening of the mixer rear baffle. The mixer upper baffle is installed on the mixer lower baffle, and the swirl tube is installed on the wire mesh assembly. The swirl tube and the wire mesh assembly are both installed inside the mixer upper baffle.

[0008] Preferably, the mixer unit comprises a second mixer unit, wherein the second mixer unit, the nozzle mounting seat, the temperature mounting seat, the pressure mounting seat, the mixer barrel and the mixer orifice plate are installed to form a second mixer assembly;

[0009] The second mixer unit includes a mixer upper baffle, a swirl tube, a wire mesh assembly, a mixer lower baffle, a mixer rear baffle and a mixer front baffle. The bottom of the mixer lower baffle is provided with an airflow channel, the top middle of the mixer rear baffle is provided with a circular opening, and the rear of the circular opening of the mixer rear baffle is provided with an airflow channel. The mixer rear baffle is installed on the mixer lower baffle, and the top of the mixer rear baffle is placed above the mixer lower baffle. The wire mesh assembly is installed on the mixer lower baffle and is located in the circular opening of the mixer rear baffle. The mixer upper baffle is installed on the mixer lower baffle, and the swirl tube is installed on the wire mesh assembly. The swirl tube and the wire mesh assembly are both installed inside the mixer upper baffle. The mixer front baffle is installed on the mixer lower baffle, and the mixer front baffle is connected between the side end of the mixer upper baffle and the wire mesh assembly.

[0010] Preferably, the swirl tube includes a mixer tube and a plurality of fins, wherein the plurality of fins surround the outer tube wall of the mixer tube and are distributed parallel to the axis of the mixer tube, and the plurality of fins are inclined at a certain angle.

[0011] Preferably, the vortex tube includes a first vortex tube and a second vortex tube, the multiple fins of the first vortex tube are arranged in a clockwise direction, the multiple fins of the second vortex tube are arranged in a counterclockwise direction, and the second vortex tube has one less fin on the left side than the first vortex tube.

[0012] Preferably, the mixer tube is conical or cylindrical.

[0013] Preferably, the wire mesh assembly comprises an inner wire mesh and an outer circular cylinder, and the wire mesh and the circular cylinder are welded to form the wire mesh assembly.

[0014] Preferably, the lower baffle of the mixer is a boat-shaped structure, the middle of the bottom of the lower baffle of the mixer is a concave structure, and both sides of the concave structure are arc-shaped protrusions.

[0015] Preferably, the mixer rear baffle is an inverted L-shaped structure, the top plane of the mixer rear baffle is provided with a circular opening and an air flow channel, and the side baffle connected to the top plane is arc-shaped.

[0016] Preferably, the nozzle mounting seat is a flange seat matching the urea nozzle, the temperature mounting seat is a flange seat matching the temperature sensor, and the pressure mounting seat is a flange seat matching the pressure air intake pipe.

[0017] The high-efficiency urea mixing device for diesel engine aftertreatment employs the present invention. Due to the large internal mixer space, it is very easy to adjust the uniformity of airflow and ammonia distribution. Consequently, the catalytic muffler component using this mixer exhibits better emission performance. The device has strong anti-crystallization capabilities, and the uniform airflow distribution within the mixer facilitates urea evaporation and thermal decomposition, reducing the risk of crystallization. Furthermore, the mixer has a high thermal efficiency, particularly the lower baffle of the mixer. During use, the airflow heats both the inner and outer surfaces of the lower baffle, significantly facilitating urea evaporation and thermal decomposition.

[0018] The device has wide versatility and adaptability. For different structural forms, by adjusting the front baffle of the mixer and the second swirl tube, a new mixing scheme can be formed. After-processors of engines with different displacements can be used, and the components of different mixer schemes can be universalized. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of the first mixer assembly of the diesel engine aftertreatment high-efficiency urea mixing device of the present invention.

[0020] Figure 2 This is a schematic structural diagram of the second mixer assembly of the diesel engine after-treatment high-efficiency urea mixing device of the present invention.

[0021] Figure 3 This is a schematic diagram of the exploded structure of the first mixer assembly of the diesel engine aftertreatment high-efficiency urea mixing device of the present invention.

[0022] Figure 4 This is a schematic diagram of the exploded structure of the second mixer assembly of the diesel engine after-treatment high-efficiency urea mixing device of the present invention.

[0023] Figure 5This is a schematic structural diagram of the first mixer unit of the diesel engine aftertreatment high-efficiency urea mixing device of the present invention.

[0024] Figure 6 This is a schematic structural diagram of the second mixer unit of the diesel engine after-treatment high-efficiency urea mixing device of the present invention.

[0025] Figure 7 This is a schematic structural diagram of the first swirl tube of the diesel engine aftertreatment high-efficiency urea mixing device of the present invention.

[0026] Figure 8 This is a schematic structural diagram of the second swirl tube of the diesel engine aftertreatment high-efficiency urea mixing device of the present invention.

[0027] Figure 9 This is a schematic structural diagram of the lower baffle of the first mixer of the diesel engine aftertreatment high-efficiency urea mixing device of the present invention.

[0028] Figure 10 This is a schematic structural diagram of the lower baffle of the second mixer of the diesel engine aftertreatment high-efficiency urea mixing device of the present invention.

[0029] Figure 11 This is a schematic structural diagram of the mixer rear baffle of the diesel engine aftertreatment high-efficiency urea mixing device of the present invention.

[0030] Figure 12 The figure is a schematic diagram of the airflow of the first mixer unit of the diesel engine aftertreatment high-efficiency urea mixing device of the present invention.

[0031] Figure 13 The figure is a schematic diagram of the airflow of the second mixer unit of the diesel engine after-treatment high-efficiency urea mixing device of the present invention.

[0032] Reference numerals:

[0033] 1.1 First mixer unit

[0034] 2.1 Second mixer unit

[0035] 1.2 Nozzle mounting bracket

[0036] 1.3 Temperature Mounting Base

[0037] 1.4 Pressure Mount

[0038] 1.5 Mixer barrel

[0039] 1.6 Mixer Orifice Plate

[0040] 1.1.1 Mixer upper baffle

[0041] 1.1.2 First cyclone

[0042] 2.1.2 Second cyclone

[0043] 1.1.3 Wire Mesh Assembly

[0044] 1.1.4 Lower baffle of the first mixer

[0045] 2.1.4 Second mixer lower baffle

[0046] 1.1.5 Mixer rear baffle

[0047] 2.1.6 Mixer front baffle DETAILED DESCRIPTION

[0048] In order to more clearly describe the technical content of the present invention, further description is given below in conjunction with specific embodiments.

[0049] The diesel engine aftertreatment high-efficiency urea mixing device of the present invention includes a mixer unit, a nozzle mounting seat 1.2, a temperature mounting seat 1.3, a pressure mounting seat 1.4, a mixer barrel 1.5 and a mixer orifice plate 1.6. The mixer unit, the nozzle mounting seat 1.2, the temperature mounting seat 1.3, the pressure mounting seat 1.4, the mixer barrel 1.5 and the mixer orifice plate 1.6 are installed to form a mixer assembly. The mixer barrel 1.5 is a cylindrical structure, the mixer orifice plate 1.6 is a circular orifice plate, and the mixer orifice plate 1.6 is installed at the rear open end of the mixer barrel 1.5. The mixer unit is installed inside the mixer barrel 1.5, the nozzle mounting seat 1.2 is installed on the barrel wall of the mixer barrel 1.5, the temperature mounting seat 1.3 is installed on the barrel wall side of the front end of the mixer barrel 1.5, and the pressure mounting seat 1.4 is installed on the barrel wall side of the front end of the mixer barrel 1.5.

[0050] As a preferred embodiment of the present invention, the mixer unit includes a first mixer unit 1.1, wherein the first mixer unit 1.1, a nozzle mounting seat 1.2, a temperature mounting seat 1.3, a pressure mounting seat 1.4, a mixer barrel 1.5 and a mixer orifice plate 1.6 are assembled to form a first mixer assembly;

[0051] The first mixer unit 1.1 comprises a mixer upper baffle 1.1.1, a swirl tube, a wire mesh assembly 1.1.3, a first mixer lower baffle 1.1.4, and a mixer rear baffle 1.1.5. The bottom of the first mixer lower baffle 1.1.4 has an airflow channel, the top center of the mixer rear baffle 1.1.5 has a circular opening, and the rear of the circular opening of the mixer rear baffle 1.1.5 has an airflow channel. The mixer rear baffle 1.1.5 is installed on the first mixer lower baffle 1.1.4. 1.4, the top of the mixer rear baffle 1.1.5 is placed above the first mixer lower baffle 1.1.4, the wire mesh assembly 1.1.3 is installed on the first mixer lower baffle 1.1.4 and is located in the circular opening of the mixer rear baffle 1.1.5, the mixer upper baffle 1.1.1 is installed on the first mixer lower baffle 1.1.4, the swirl tube is installed on the wire mesh assembly 1.1.3, and the swirl tube and wire mesh assembly 1.1.3 are both installed inside the mixer upper baffle 1.1.1.

[0052] As a preferred embodiment of the present invention, the mixer unit includes a second mixer unit 2.1, wherein the second mixer unit 2.1, the nozzle mounting seat 1.2, the temperature mounting seat 1.3, the pressure mounting seat 1.4, the mixer barrel 1.5 and the mixer orifice plate 1.6 are assembled to form a second mixer assembly;

[0053] The second mixer unit 2.1 includes a mixer upper baffle 1.1.1, a swirl tube, a wire mesh assembly 1.1.3, a second mixer lower baffle 2.1.4, a mixer rear baffle 1.1.5 and a mixer front baffle 2.1.6. The bottom of the second mixer lower baffle 2.1.4 has an air flow channel, the top of the mixer rear baffle 1.1.5 has a circular opening in the middle, and the rear of the circular opening of the mixer rear baffle 1.1.5 has an air flow channel. The mixer rear baffle 1.1.5 is installed on the second mixer lower baffle 2.1.4, and the top of the mixer rear baffle 1.1.5 is placed on the second mixer lower baffle 2. .1.4, the wire mesh assembly 1.1.3 is installed on the second mixer lower baffle 2.1.4 and is located in the circular opening of the mixer rear baffle 1.1.5, the mixer upper baffle 1.1.1 is installed on the second mixer lower baffle 2.1.4, the swirl tube is installed on the wire mesh assembly 1.1.3, the swirl tube and the wire mesh assembly 1.1.3 are both installed inside the mixer upper baffle 1.1.1, the mixer front baffle 2.1.6 is installed on the second mixer lower baffle 2.1.4, and the mixer front baffle 2.1.6 is connected between the side end of the mixer upper baffle 1.1.1 and the wire mesh assembly 1.1.3.

[0054] As a preferred embodiment of the present invention, the swirl tube includes a mixer tube and a plurality of fins. The plurality of fins surround the outer tube wall of the mixer tube and are distributed parallel to the axis of the mixer tube. The plurality of fins are inclined at a certain angle.

[0055] As a preferred embodiment of the present invention, the vortex tube includes a first vortex tube 1.1.2 and a second vortex tube 2.1.2. The multiple fins of the first vortex tube 1.1.2 are arranged in a clockwise direction, and the multiple fins of the second vortex tube 2.1.2 are arranged in a counterclockwise direction. The second vortex tube has one less fin on the left side than the first vortex tube.

[0056] As a preferred embodiment of the present invention, the mixer tube is conical or cylindrical.

[0057] As a preferred embodiment of the present invention, the wire mesh assembly 1.1.3 includes an inner wire mesh and an outer circular cylinder, and the wire mesh and the circular cylinder are welded to form the wire mesh assembly 1.1.3.

[0058] As a preferred embodiment of the present invention, the mixer lower baffles 1.1.4 and 2.14 are of ship-shaped structure, the middle of the bottom of the mixer lower baffles 1.1.4 and 2.14 is a concave structure, and both sides of the concave structure are arc-shaped protrusions.

[0059] As a preferred embodiment of the present invention, the mixer rear baffle 1.1.5 is an inverted L-shaped structure, with a circular opening and an air flow channel on the top plane, and a side baffle connected to the top plane is arc-shaped.

[0060] As a preferred embodiment of the present invention, the nozzle mounting seat 1.2 is a flange seat matching the urea nozzle, the temperature mounting seat 1.3 is a flange seat matching the temperature sensor, and the pressure mounting seat 1.4 is a flange seat matching the pressure air intake pipe.

[0061] In a specific embodiment of the present invention, a high-efficiency urea mixer structure for diesel engine aftertreatment is provided, which has a simple structure, is easy to operate, and can be widely applied to various catalytic muffler components, thereby effectively overcoming the defects of the prior art.

[0062] The present invention combines the advantages of the double-plate mixer in terms of uniform airflow organization and the steel mesh in utilizing the engine exhaust energy to evaporate, hydrolyze and pyrolyze urea, thereby reducing or even avoiding the generation of precipitates and increasing the anti-crystallization capability of the mixer.

[0063] like Figures 1 to 6 , the present invention discloses a hybrid structure device, such as Figure 1 Shown is a first mixer unit 1.1 and its variants, such as Figure 2 Shown is the second mixer unit 2.1.

[0064] like Figure 3 As shown, the first mixer unit 1.1, the nozzle mounting seat 1.2, the temperature mounting seat 1.3, the pressure mounting seat 1.4, the mixer barrel 1.5 and the mixer orifice plate 1.6 constitute the first mixer assembly of the first form of the mixer assembly.

[0065] like Figure 4 As shown, the second mixer unit 2.1, the nozzle mounting seat 1.2, the temperature mounting seat 1.3, the pressure mounting seat 1.4, the mixer barrel 1.5 and the mixer orifice 1.6 constitute a second mixer assembly of the second form of the mixer assembly.

[0066] like Figure 5 As shown, the mixer upper baffle 1.1.1, the first cyclone tube 1.1.2, the wire mesh assembly 1.1.3, the first mixer lower baffle 1.1.4 and the mixer rear baffle 1.1.5 are welded together to form the first mixer unit 1.1.

[0067] like Figure 6 As shown, the mixer upper baffle 1.1.1, the second cyclone tube 2.1.2, the wire mesh assembly 1.1.3, the second mixer lower baffle 2.1.4, the mixer rear baffle 1.1.5 and the mixer front baffle 2.1.6 are welded together to form the second mixer unit 2.1.

[0068] The nozzle mounting seat 1.2 is a flange seat that matches the urea nozzle. Its specific position and shape shall be subject to actual design requirements.

[0069] The temperature mounting seat 1.3 is a flange seat that matches the temperature sensor. Its specific position and shape shall be subject to actual design requirements.

[0070] The pressure mounting seat 1.4 is a flange seat that matches the pressure gas pipe. Its specific position and shape shall be subject to actual design requirements.

[0071] The function of the mixer barrel 1.5 is to weld the first mixer unit 1.1 or the second mixer unit 2.1, the nozzle mounting seat 1.2, the temperature mounting seat 1.3, the pressure mounting seat 1.4, the mixer orifice plate 1.6, etc. into a whole. Its specific position and shape shall be based on actual design requirements.

[0072] The mixer orifice plate 1.6 is a orifice plate with a certain shape, and its function is to adjust the air flow and ammonia uniformity after flowing through the orifice plate.

[0073] like Figures 7 and 8As shown, the structural differences between the first swirl tube 1.1.2 and the second swirl tube 2.1.2 lie not only in the direction of rotation but also in the number of blades. The first mixer unit 1.1 can use either clockwise or counterclockwise blades. The second mixer unit 2.1 can only use a counterclockwise configuration because the second swirl tube 2.1.2 has one less blade and because of the structure of the mixer front baffle 2.1.6.

[0074] The first swirl tube 1.1.2 and the second swirl tube 2.1.2 are provided with a plurality of fins inclined at a certain angle around their periphery to form a swirl flow. The entire swirl tube is a conical or cylindrical mixer tube. The angle, size, number and other parameters of the fins can be defined according to actual needs.

[0075] Part of the first swirl tube 1.1.2 and the second swirl tube 2.1.2 is a swirl structure with fins, and the other part is a perforated tube or a combination tube without perforations to adjust the airflow accordingly.

[0076] The upper baffle 1.1.1 of the mixer is shaped to converge the airflow into the first swirl tube 1.1.2 and the second swirl tube 2.1.2. The specific shape can be defined according to actual needs.

[0077] The wire mesh assembly 1.1.3 is a welded assembly of an internal wire mesh and an external circular cylinder. Its function is to fully mix and pyrolyze the urea aqueous solution with the exhaust gas. The specific shape, size, thickness, specific position, etc. can be defined according to actual needs.

[0078] like Figures 9 and 10 As shown, the first mixer lower baffle 1.1.4 and the second mixer lower baffle 2.1.4 are plates of a certain shape, which are used to divide and decompose the airflow and guide the airflow. The specific shape, size and position can be defined according to actual needs.

[0079] like Figure 9 and Figure 10 As shown, the first mixer lower baffle 1.1.4 and the second mixer lower baffle 2.1.4 in the mixer unit are a ship-like part, and a channel for air flow is reserved at the bottom.

[0080] The mixer rear plate 1.1.5 is a plate of a certain shape, which is used to divide and block the airflow, and at the same time guide the airflow. The specific shape, size and position can be defined according to actual needs.

[0081] like Figure 11 As shown, the mixer rear baffle 1.1.5 is a part similar to an inverted L-shape, which reserves a channel for air flow.

[0082] The mixer front baffle 2.1.6 is a plate with a certain shape. Its function is to divide and block the airflow, and at the same time guide the airflow through. It cooperates with the second swirl tube 2.1.2 to adjust the airflow by adjusting the size and length of the blades. The specific shape, size and position can be defined according to actual needs.

[0083] The air flow diagram of the first mixer unit 1.1 is as follows: Figure 12 As shown: The intake airflow i. simultaneously enters the first swirl tube 1.1.2, the bottom of the first mixer lower baffle 1.1.4, and the reserved airflow channel on the mixer rear baffle 1.1.5, then forms airflow ii. Enters the wire mesh assembly 1.1.3, and after passing through the wire mesh assembly 1.1.3, forms airflow iii. Enters the interior of the first mixer lower baffle 1.1.4, forming two airflows iv. Flows out of the mixer unit 1.1. The air intake holes on the first mixer lower baffle 1.1.4 play a role in regulating the direction of the airflow.

[0084] The air flow diagram of the second mixer unit 2.1 is as follows: Figure 13 As shown, the intake airflow i. simultaneously enters the second swirl tube 2.1.2, the bottom of the second mixer lower baffle 2.1.4, and the reserved airflow channel on the mixer rear baffle 1.1.5, forming airflow ii. It enters the wire mesh assembly 1.1.3, passing through it to form airflow iii. It enters the interior of the first mixer lower baffle 2.1.4, forming two airflows, and iv. It exits the mixer unit. The small air inlet holes on the first mixer lower baffle 2.1.4 regulate the direction of the airflow, and the inner surface flows out of the second mixer unit 2.1.

[0085] In summary, it can be clearly seen that the air intake and air outlet modes of the first mixer unit 1.1 and the second mixer unit 2.1 are significantly different.

[0086] The operating conditions of the first mixer unit 1.1 and the second mixer unit 2.1 should be comprehensively considered in combination with factors such as the customer's engine operating conditions, requirements for the mixer's anti-crystallization ability, ammonia uniformity and conversion efficiency, and emission requirements. Choosing different mixer structures will result in different experimental results.

[0087] The specific implementation scheme of this embodiment can be found in the relevant descriptions in the above embodiments and will not be repeated here.

[0088] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0089] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" is at least two.

[0090] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0091] The diesel engine after-treatment high-efficiency urea mixing device of the present invention has good emission performance. Since the internal mixer space is large, it is very easy to adjust the uniformity of the airflow distribution and the uniformity of the ammonia distribution. Therefore, the emission performance of the catalytic muffler component using this mixer is better. The device has a strong anti-crystallization ability, and the uniform airflow distribution of the mixer is beneficial to the evaporation and pyrolysis of urea, which can reduce the risk of crystallization; at the same time, the thermal utilization rate of the mixer is relatively high, especially the lower baffle of the mixer. During use, the inner and outer surfaces of the lower baffle of the mixer will be heated by the airflow, which is very beneficial to the evaporation and pyrolysis of urea. The versatility and adaptability of this device are wide. According to different structural forms, by adjusting the front baffle of the mixer and the second swirl tube, a new mixing scheme can be formed, and engine after-processors of different displacements can be used. Moreover, the components between different mixer schemes can be universalized.

[0092] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it will be apparent that various modifications and variations may be made without departing from the spirit and scope of the present invention. Accordingly, the specification and drawings are to be regarded as illustrative rather than restrictive.

Claims

1. A diesel engine post-treatment high-efficiency urea mixing device, characterized in that: The device comprises a mixer unit, a nozzle mounting seat, a temperature mounting seat, a pressure mounting seat, a mixer barrel and a mixer orifice plate. The mixer unit, the nozzle mounting seat, the temperature mounting seat, the pressure mounting seat, the mixer barrel and the mixer orifice plate are installed to form a mixer assembly. The mixer barrel is a cylindrical structure, the mixer orifice plate is a circular orifice plate, the mixer orifice plate is installed at the rear opening end of the mixer barrel, the mixer unit is installed inside the mixer barrel, the nozzle mounting seat is installed on the barrel wall of the mixer barrel, the temperature mounting seat is installed on the barrel wall side at the front end of the mixer barrel, and the pressure mounting seat is installed on the barrel wall side at the front end of the mixer barrel.

2. The diesel engine post-treatment high-efficiency urea mixing device according to claim 1, characterized in that: The mixer unit comprises a first mixer unit, wherein the first mixer unit, a nozzle mounting seat, a temperature mounting seat, a pressure mounting seat, a mixer barrel and a mixer orifice plate are installed to form a first mixer assembly; The first mixer unit comprises a mixer upper baffle, a swirl tube, a wire mesh assembly, a mixer lower baffle and a mixer rear baffle, the bottom of the mixer lower baffle is provided with an airflow channel, the top middle of the mixer rear baffle is provided with a circular opening, the rear of the circular opening of the mixer rear baffle is provided with an airflow channel, the mixer rear baffle is mounted on the mixer lower baffle, the top of the mixer rear baffle is placed above the mixer lower baffle, the wire mesh assembly is mounted on the mixer lower baffle and is located in the circular opening of the mixer rear baffle, the mixer upper baffle is mounted on the mixer lower baffle, the swirl tube is mounted on the wire mesh assembly, and the swirl tube and the wire mesh assembly are both mounted inside the mixer upper baffle.

3. The diesel engine post-treatment high-efficiency urea mixing device according to claim 1, characterized in that: The mixer unit comprises a second mixer unit, wherein the second mixer unit, a nozzle mounting seat, a temperature mounting seat, a pressure mounting seat, a mixer barrel and a mixer orifice plate are installed to form a second mixer assembly; The second mixer unit comprises a mixer upper baffle, a swirl tube, a wire mesh assembly, a mixer lower baffle, a mixer rear baffle and a mixer front baffle. The bottom of the mixer lower baffle is provided with an airflow channel, the top middle of the mixer rear baffle is provided with a circular opening, the rear of the circular opening of the mixer rear baffle is provided with an airflow channel, the mixer rear baffle is mounted on the mixer lower baffle, the top of the mixer rear baffle is placed above the mixer lower baffle, the wire mesh assembly is mounted on the second mixer lower baffle and is located in the circular opening of the mixer rear baffle, the mixer upper baffle is mounted on the mixer lower baffle, the swirl tube is mounted on the wire mesh assembly, the swirl tube and the wire mesh assembly are both mounted inside the mixer upper baffle, the mixer front baffle is mounted on the mixer lower baffle, and the mixer front baffle is connected between the side end of the mixer upper baffle and the wire mesh assembly.

4. The diesel engine post-treatment high-efficiency urea mixing device according to claim 2 or 3, characterized in that: The swirl tube comprises a mixer tube and a plurality of fins. The plurality of fins surround the outer tube wall of the mixer tube and are distributed parallel to the axis of the mixer tube. The plurality of fins are inclined at a certain angle.

5. The diesel engine post-treatment high-efficiency urea mixing device according to claim 4, characterized in that: The vortex tube includes a first vortex tube and a second vortex tube. The multiple fins of the first vortex tube are arranged in a clockwise direction, and the multiple fins of the second vortex tube are arranged in a counterclockwise direction. The second vortex tube has one less fin on the left side than the first vortex tube.

6. The diesel engine post-treatment high-efficiency urea mixing device according to claim 4, characterized in that: The mixer tube is conical or cylindrical.

7. The diesel engine post-treatment high-efficiency urea mixing device according to claim 2 or 3, characterized in that: The wire mesh assembly comprises an inner wire mesh and an outer circular cylinder, and the wire mesh and the circular cylinder are welded to form the wire mesh assembly.

8. The diesel engine post-treatment high-efficiency urea mixing device according to claim 2 or 3, characterized in that: The lower baffle of the mixer is a boat-shaped structure, the middle of the bottom of the lower baffle of the mixer is a concave structure, and both sides of the concave structure are arc-shaped protrusions.

9. The diesel engine post-treatment high-efficiency urea mixing device according to claim 2 or 3, characterized in that: The mixer rear baffle is an inverted L-shaped structure, a circular opening and an air flow channel are provided on the top plane of the mixer rear baffle, and a side baffle connected to the top plane is arc-shaped.

10. The diesel engine post-treatment high-efficiency urea mixing device according to claim 1, characterized in that: The nozzle mounting seat is a flange seat matching the urea nozzle, the temperature mounting seat is a flange seat matching the temperature sensor, and the pressure mounting seat is a flange seat matching the pressure air intake pipe.

Images