A tail gas purification device with a novel urea injection mixing assembly

Abstract

This utility model relates to an exhaust gas purification device with a novel urea injection mixing assembly, comprising a housing and two ends. The housing houses the urea injection mixing assembly, and the housing has nozzles for injecting urea. The urea injection mixing assembly includes two fixed plates and multiple guide plates positioned between the two fixed plates. Guide holes are formed on both fixed plates and the multiple guide plates. Insert blocks are provided on each of the multiple guide plates, and multiple slots are formed on both fixed plates. The insert blocks are inserted into the multiple slots. The multiple guide plates and the two fixed plates together form a mixing chamber, with the nozzle head facing the mixing chamber. A first positioning part is provided on the side of each fixed plate opposite to the guide plates, and a second positioning part is provided on the inner wall of the housing. The first positioning part and the second positioning part are inserted into each other. This utility model improves the structure of the urea injection mixing assembly, facilitating the assembly of the urea injection mixing assembly itself and its assembly with the exhaust gas purification device.

Description

Technical Field

[0001] This utility model relates to the field of purification devices, and in particular to an exhaust gas purification device with a novel urea injection mixing component. Background Technology

[0002] Exhaust gas purification devices are technological devices that combine physical filtration with catalytic chemical reactions. Typically, an exhaust gas purification device contains a urea injection mixer. This mixer ensures thorough mixing of urea with the engine exhaust, providing the necessary conditions for the subsequent reduction of NOx (nitrogen oxides) to harmless nitrogen and water in the SCR catalytic converter.

[0003] However, existing urea injection mixers are large and heavy, making installation inside exhaust gas purification devices difficult and requiring skilled workers. Therefore, a new connection structure needs to be designed to reduce the installation difficulty of urea injection mixers. Utility Model Content

[0004] This application provides an exhaust gas purification device with a novel urea injection mixing component, which improves the structure of the urea injection mixing component and facilitates the assembly of the urea injection mixing component itself and its assembly with the exhaust gas purification device.

[0005] The exhaust gas purification device with a novel urea injection mixing assembly provided in this application adopts the following technical solution:

[0006] A tail gas purification device with a novel urea injection mixing assembly includes a housing and two ends. The housing houses the urea injection mixing assembly and has nozzles for injecting urea. The urea injection mixing assembly includes two fixed plates and multiple guide plates disposed between the two fixed plates. Guide holes are formed on both fixed plates and the multiple guide plates. Insert blocks are provided on the multiple guide plates, and multiple slots are formed on both fixed plates. The multiple insert blocks are inserted into the multiple slots. The multiple guide plates and the two fixed plates together form a mixing chamber, and the nozzle head faces the mixing chamber. A first positioning part is provided on the side of each fixed plate opposite to the guide plates, and a second positioning part is provided on the inner wall of the housing. The first positioning part and the second positioning part are inserted into each other.

[0007] By adopting the above technical solution, the urea injection mixing assembly uses a modular structure, which effectively reduces its installation difficulty. A first positioning part and a second positioning part are provided to assist workers in placing the fixing plate. During installation, a fixing plate is first placed inside the housing, aligning the first positioning part with the second positioning part, and then the first and second positioning parts on the fixing plate are inserted. Next, multiple guide plates are inserted onto the fixed plate. Then, another fixing plate is placed inside the housing and inserted into the guide plates, aligning the first positioning part with the second positioning part. The first positioning part is then inserted into the second positioning part, completing the installation of the urea injection mixing assembly within the housing. After the fixing plate is installed, the first and second positioning parts provide a certain degree of anti-displacement and anti-deflection function, preventing displacement of the urea injection mixing assembly during subsequent use of the exhaust gas purification device.

[0008] Preferably, the first positioning part is a positioning rod provided on the fixed plate, and the second positioning part is a positioning hole opened on the inner wall of the housing, wherein the positioning rod is inserted into the positioning hole.

[0009] By adopting the above technical solution, the cooperation between the positioning rod and the positioning hole can remind workers of the placement position of the fixing plate.

[0010] Preferably, the fixing plate is provided with a mounting block, and the positioning rod is threadedly connected to the mounting block.

[0011] By adopting the above technical solution, the threaded engagement between the positioning rod and the mounting block ensures that the positioning rod is less likely to come out of the positioning hole due to vibration in the later stages of use of the exhaust gas purification device, thus guaranteeing the limiting effect of the fixing plate brought about by the insertion and engagement of the positioning rod and the positioning hole.

[0012] Preferably, one of the fixing plates is disc-shaped and the other is semi-disc-shaped. The disc-shaped fixing plate has a through groove, and a sealing block is inserted into the through groove to seal the through groove.

[0013] By employing the aforementioned technical solution, directly assembling the urea injection mixing assembly inside the housing would significantly increase the assembly difficulty due to the dim lighting and limited space within the housing. The above structure allows the urea injection mixing assembly to be assembled outside the housing. Workers can then grip the two fixing plates by inserting their fingers through the slot, thus holding the urea injection mixing assembly. The assembled urea injection mixing assembly can then be directly inserted into the housing. A sealing block is then inserted into the slot to seal it, preventing interference with the mixing of urea and exhaust gas. The slot design provides workers with an alternative installation method for the urea injection mixing assembly. Whether installing the urea injection mixing assembly directly inside or outside the housing, workers can operate according to their own habits; the core principle is to improve the installation efficiency of the urea injection mixing assembly.

[0014] Preferably, the disc-shaped fixing plate is provided with a first connecting portion, and the semi-disc-shaped fixing plate is provided with a second connecting portion, wherein the first connecting portion and the second connecting portion are connected.

[0015] By adopting the above technical solution, two connecting parts are set to enhance the connection strength of the urea injection mixing component after assembly.

[0016] Preferably, the first connecting part includes a connecting rod, the second connecting part includes a nut, the connecting rod passes through a semi-disc-shaped fixing plate, and the nut is threaded onto the connecting rod.

[0017] By adopting the above technical solution, after the urea injection mixing component is placed into the housing, the nut is tightened onto the connecting rod, which can enhance the connection firmness of the urea injection mixing component after assembly.

[0018] Preferably, the connecting rod is disposed on one side of the sealing block near the semi-disc-shaped fixing plate, a limiting groove is formed on the side wall of the through groove, a limiting block is integrally formed on the sealing block, the limiting block is inserted into the limiting groove and restricts the movement of the sealing block towards the semi-disc-shaped fixing plate.

[0019] By adopting the above technical solution, when the sealing block is inserted, the connecting rod will also pass through the semi-circular fixing plate. This structure facilitates the placement of the urea injection mixing assembly, and the connecting rod will not interfere with the worker's grip on the urea injection mixing assembly.

[0020] Preferably, both fixing plates are provided with multiple machining holes, and four machining holes are grouped together. The four machining holes in the same group are respectively connected to the four corners of a slot.

[0021] By adopting the above technical solution, the opening of the processing hole facilitates the positioning and turning of the laser cutting head, which is used to process and form slots, thereby improving the processing accuracy and efficiency of the slots.

[0022] The main technical effects of this utility model are reflected in the following aspects:

[0023] 1. The urea injection mixing assembly of this utility model adopts an assembly structure, which simplifies the installation difficulty of the urea injection mixing assembly;

[0024] 2. This utility model can assemble a urea injection mixing component on the outside of the housing, and designs a positioning rod and positioning hole structure to assist in the installation of the urea injection mixing component;

[0025] 3. The grooved structure of this utility model makes it easy for workers to grasp the assembled urea spray mixing component, thus making it easier for workers to assemble the urea spray mixing component into the housing. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the exhaust gas purification device.

[0027] Figure 2 This is a schematic diagram of the structure of the housing and the urea injection mixing assembly.

[0028] Figure 3 yes Figure 2 A schematic diagram of the structure of the urea injection mixing assembly and nozzle.

[0029] Figure 4 This is an exploded view of the urea injection mixing assembly.

[0030] Figure 5 yes Figure 4 A magnified view of a portion of point A in the middle.

[0031] Figure 6 A schematic diagram of the shell structure.

[0032] Figure 7 This is a structural diagram of the blocking block, the limiting block, the first connecting part, and the second connecting part.

[0033] Reference numerals: 11. Housing; 12. End; 13. Nozzle; 2. Urea injection mixing assembly; 21. Fixing plate; 211. Mounting block; 22. Guide plate; 23. Guide hole; 24. Insert block; 25. Slot; 26. Mixing chamber; 27. Through groove; 28. Sealing block; 3. First positioning part; 31. Positioning rod; 4. Second positioning part; 41. Positioning hole; 5. First connecting part; 51. Connecting rod; 6. Second connecting part; 61. Nut; 71. Limiting groove; 72. Limiting block; 73. Machining hole. Detailed Implementation

[0034] The present application will be further described in detail below with reference to the accompanying drawings, so that the technical solution of the present application can be more easily understood and mastered.

[0035] Reference Figure 1 The exhaust gas purification device with a novel urea injection mixing assembly in this embodiment includes a housing 11 and two ends 12, and a nozzle 13 for injecting urea is installed on the housing 11.

[0036] Reference Figures 1-5 Referring to the housing 11, a urea injection mixing assembly 2 is installed inside. The urea injection mixing assembly 2 includes two fixed plates 21 and multiple guide plates 22 disposed between the two fixed plates 21. Each guide plate 22 is provided with an insert 24. Each of the two fixed plates 21 has multiple slots 25, and the multiple inserts 24 are inserted and fitted into the multiple slots 25. Each of the two fixed plates 21 has multiple machining holes 73. Four machining holes 73 are grouped together, and the four machining holes 73 in the same group are respectively connected to the four corners of a slot 25.

[0037] Reference Figure 3 and Figure 4 Multiple guide holes 23 are provided on both fixed plates 21 and multiple guide plates 22. The shape and distribution of the multiple guide holes 23 on the two fixed plates 21 and multiple guide plates 22 are optimized by computer simulation, so that the exhaust airflow forms a vortex or air film in the mixing chamber 26, which evenly coats the urea droplets and prevents the urea droplets from contacting the inner wall of the mixer too early (to prevent crystallization and blockage). At the same time, the guide plates 22 guide the airflow to fully contact the urea, accelerating the pyrolysis of urea.

[0038] Reference Figure 2 and Figure 3 Multiple guide vanes 22 and two fixed plates 21 surround and form a mixing chamber 26, with the nozzle 13 facing the mixing chamber 26. The internal structure of the mixer (such as the shape of the guide vanes 22 and the mixing chamber 26) is optimized through CFD (Computational Fluid Dynamics) simulation to reduce mixing dead zones, improve the mixing uniformity of ammonia and exhaust gas, and avoid local over-spraying (crystallization blockage) or under-spraying (NOx exceeding the standard) caused by uneven ammonia distribution in the SCR catalyst.

[0039] Reference Figure 2 , Figure 6 Each of the two fixing plates 21 has a mounting block 211 formed on one side opposite to the guide plate 22. The mounting block 211 has a first positioning part 3, which is a positioning rod 31 threadedly connected to the mounting block 211. A second positioning part 4 is provided on the inner wall of the housing 11, which is a positioning hole 41 formed on the inner wall of the housing 11. When the fixing plate 21 is placed inside the housing 11, aligning the positioning rod 31 with the positioning hole 41 determines the placement position of the fixing plate 21.

[0040] Reference Figures 2-4 , Figure 7One fixing plate 21 is disc-shaped, and the other fixing plate 21 is semi-disc-shaped. The disc-shaped fixing plate 21 has a through groove 27, and a sealing block 28 is inserted into the through groove 27 to seal the through groove 27. Two limiting grooves 71 are formed on the side wall of the through groove 27. Two limiting blocks 72 are integrally formed on the sealing block 28. The limiting blocks 72 are inserted into the limiting grooves 71 and restrict the movement of the sealing block 28 towards the semi-disc-shaped fixing plate 21.

[0041] Reference Figures 2-4 , Figure 7 The disc-shaped fixing plate 21 is provided with a first connecting part 5, which includes a connecting rod 51 formed on the side of the sealing block 28 near the semi-disc-shaped fixing plate 21, and the connecting rod 51 passes through the semi-disc-shaped fixing plate 21. The semi-disc-shaped fixing plate 21 is provided with a second connecting part 6, which includes a nut 61, and the nut 61 is threadedly engaged with the connecting rod 51.

[0042] Reference Figures 1-7 The installation steps for assembling the urea injection mixing assembly 2 outside the housing 11 and then inserting it into the housing 11 are as follows:

[0043] First, the worker attaches multiple guide plates 22 to the two fixing plates 21 on the outside to complete the installation of the urea injection mixing assembly 2. Then, the worker's fingers pass through the slot 27 to grasp the two fixing plates 21 of the column, thereby grasping the urea injection mixing assembly 2. Next, the worker inserts the assembled urea injection mixing assembly 2 into the housing 11.

[0044] After the urea injection mixing assembly 2 is placed into the housing 11, it is necessary to ensure that the two positioning rods 31 are aligned with the two positioning holes 41. This ensures the accurate placement of the urea injection mixing assembly 2, so that the nozzle 13 can be directly facing the mixing chamber 26 after it is installed into the housing 11.

[0045] After aligning the two positioning rods 31 with the two slots 25, the worker screws the two positioning rods 31 into the two slots 25, completing the positioning of the urea injection mixing assembly 2. Then, the worker inserts the sealing block 28 into the through slot 27, allowing the connecting rod 51 to pass through the semi-circular fixing plate 21. Next, the worker screws the nut 61 onto the connecting rod 51, allowing the sealing block 28 and the nut 61 to press against the two fixing plates 21, thereby improving the connection strength of the assembled urea injection mixing assembly 2.

[0046] Of course, the above are just typical examples of this application. In addition, this application may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed in this application.

Claims

1. A tail gas purification device with a novel urea injection mixing assembly, comprising a housing (11) and two end caps (12), wherein the housing (11) is provided with a urea injection mixing assembly (2), and the housing (11) is provided with a nozzle (13) for injecting urea, characterized in that: The urea injection mixing assembly (2) includes two fixed plates (21) and multiple guide plates (22) disposed between the two fixed plates (21). Guide holes (23) are provided on both fixed plates (21) and multiple guide plates (22). Insert blocks (24) are provided on multiple guide plates (22). Multiple slots (25) are provided on both fixed plates (21). Multiple insert blocks (24) are inserted into multiple slots (25). Multiple guide plates (22) and two fixed plates (21) together form a mixing chamber (26). The nozzle (13) is facing the mixing chamber (26). A first positioning part (3) is provided on the side of the two fixed plates (21) facing away from the guide plates (22). A second positioning part (4) is provided on the inner wall of the housing (11). The first positioning part (3) and the second positioning part (4) are inserted into each other.

2. The exhaust gas purification device with a novel urea injection mixing assembly according to claim 1, characterized in that: The first positioning part (3) is a positioning rod (31) provided on the fixed plate (21), and the second positioning part (4) is a positioning hole (41) opened on the inner wall of the housing (11). The positioning rod (31) is inserted into the positioning hole (41).

3. The exhaust gas purification device with a novel urea injection mixing assembly according to claim 2, characterized in that: The fixing plate (21) is provided with a mounting block (211), and the positioning rod (31) is threadedly connected to the mounting block (211).

4. The exhaust gas purification device with a novel urea injection mixing assembly according to claim 1, characterized in that: One of the fixing plates (21) is disc-shaped, and the other fixing plate (21) is semi-disc-shaped. The disc-shaped fixing plate (21) has a through groove (27), and a sealing block (28) is inserted into the through groove (27). The sealing block (28) is used to seal the through groove (27).

5. The exhaust gas purification device with a novel urea injection mixing assembly according to claim 4, characterized in that: The disc-shaped fixing plate (21) is provided with a first connecting part (5), and the semi-disc-shaped fixing plate (21) is provided with a second connecting part (6), and the first connecting part (5) and the second connecting part (6) are connected.

6. The exhaust gas purification device with a novel urea injection mixing assembly according to claim 5, characterized in that: The first connecting part (5) includes a connecting rod (51), and the second connecting part (6) includes a nut (61). The connecting rod (51) passes through a semi-disc-shaped fixing plate (21), and the nut (61) is threaded onto the connecting rod (51).

7. The exhaust gas purification device with a novel urea injection mixing assembly according to claim 6, characterized in that: The connecting rod (51) is located on one side of the sealing block (28) near the semi-disc-shaped fixing plate (21). A limiting groove (71) is provided on the side wall of the through groove (27). A limiting block (72) is integrally formed on the sealing block (28). The limiting block (72) is inserted into the limiting groove (71) and restricts the movement of the sealing block (28) towards the semi-disc-shaped fixing plate (21).

8. The exhaust gas purification device with a novel urea injection mixing assembly according to claim 1, characterized in that: Both of the fixing plates (21) are provided with multiple machining holes (73). The four machining holes (73) are grouped together, and the four machining holes (73) in the same group are respectively connected to the four corners of a slot (25).

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