An engine exhaust aftertreatment mixing device

Abstract

This utility model discloses an engine exhaust aftertreatment mixing device, relating to the technical field of engine exhaust treatment devices. It includes a primary filter assembly, a secondary filter assembly, and a mixing assembly. The output end of the primary filter assembly is connected to the input end of the secondary filter assembly, and a mixing assembly is disposed in the connecting area. The mixing blades create a swirling flow, increasing the flow velocity. Furthermore, the arc-shaped design of the mixing blades changes the flow direction of the airflow, increasing the turbulence within the flow channel, thus ensuring thorough mixing of the urea solution and exhaust gas. The horizontal flow channel further disrupts the airflow, enhancing the mixing effect while reducing the impact force of the airflow on the mixing blades and extending their service life. This ensures that the ammonia gas formed is fully mixed with the exhaust gas before reaching the catalyst core, increasing the contact opportunity between urea and nitrogen oxides in the exhaust gas, improving reaction efficiency, ensuring uniform ammonia distribution, and preventing urea crystallization.

Description

Technical Field

[0001] This utility model relates to the technical field of engine exhaust treatment devices, specifically to an engine exhaust aftertreatment mixing device. Background Technology

[0002] Automobile exhaust mainly consists of carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx). When these substances accumulate to a certain level in the air, they react under sunlight to produce photochemical smog containing nitrogen dioxide (NO2) and ozone (O3). Both of these substances are poorly soluble in water and, when inhaled, can penetrate directly into the lungs. At high concentrations, they can cause toxic edema. When they enter the bloodstream, they can form denatured hemoglobin, causing tissue hypoxia and posing a significant threat to human health. In addition, hydrogen oxides can form acid rain after entering the atmosphere, harming the ecological environment. With the continuous increase in the number of automobiles, countries around the world are paying increasing attention to the problem of automobile exhaust emissions, and generally treat and decompose automobile exhaust through engine exhaust aftertreatment mixing devices.

[0003] Most existing diesel engine exhaust aftertreatment mixing devices have low hydrolysis efficiency of the urea sprayed from the nozzles inside the device, and also suffer from uneven ammonia distribution and urea crystallization, causing many inconveniences to the exhaust gas treatment work.

[0004] In summary, most existing diesel engine exhaust aftertreatment mixing devices suffer from low hydrolysis efficiency of the urea sprayed from the nozzles inside the device, as well as uneven ammonia distribution and urea crystallization. Utility Model Content

[0005] The purpose of this utility model is to provide an engine exhaust aftertreatment mixing device to solve the technical problems of low hydrolysis efficiency of urea sprayed from the nozzle inside the device, uneven ammonia distribution and urea crystallization in most existing diesel vehicle engine exhaust aftertreatment mixing devices.

[0006] The technical problem to be solved by this utility model can be achieved through the following technical solution:

[0007] An engine exhaust aftertreatment mixing device,

[0008] It includes a primary filter component, a secondary filter component, and a mixing component. The output end of the primary filter component is connected to the input end of the secondary filter component, and the mixing component is provided in the area where the two are connected.

[0009] The mixing assembly includes a nozzle, a mixing chamber located at the nozzle output end, two diversion channels at the bottom of the mixing chamber, an i-shaped plate located at the end of the mixing chamber away from the nozzle, a sleeve groove on one side of the i-shaped plate that matches the mixing chamber, a flow groove on the other side of the i-shaped plate, a limiting barrier fitted to the inner wall of the flow groove, mixing blades evenly distributed inside the limiting barrier, the mixing blades being arc-shaped plates, a horizontal flow groove on the protruding surface of the bent part of the mixing blade, several sets of stepped grooves symmetrically distributed on both sides of the top of the mixing chamber, and a dispersion assembly movably mounted on the stepped grooves for dispersing urea.

[0010] Preferably, the primary filter assembly includes a first housing, and the bottom of the first housing is provided with an exhaust pipe, an air pipe one, and an air pipe two for air intake.

[0011] Preferably, the secondary filter assembly includes a second housing, which is located on one side of the first housing, and the bottom of the second housing is provided with an exhaust pipe for venting.

[0012] Preferably, the top of the first housing and the second housing are provided with sealing caps for protecting the mixing assembly.

[0013] Preferably, the first shell and the second shell are provided with a connecting plate that cooperates with each other on the side that is close to each other, the first shell and the second shell are provided with a positioning sleeve on the top outer side, and the first shell and the second shell are respectively provided with a fixing plate one and a fixing plate two for fixing.

[0014] Preferably, a sampling tube one is provided on the outer side of the sealing cover near the second housing, and a sampling tube two is provided at the bottom end of the C-shaped plate.

[0015] Preferably, a filter element is provided inside the first housing, a catalyst element is provided inside the second housing, and a filter plate is provided at the top of the first housing, with the filter plate located below the mixing assembly.

[0016] Preferably, the dispersion component includes several sets of side plates symmetrically arranged on both sides of the mixing cavity, with the side plates located below the stepped groove. The top of the side plates is symmetrically provided with supports, and the top of the supports is rotatably provided with a rotating shaft.

[0017] Preferably, an evaporation plate is provided between the rotating shafts, a positioning gear is provided at the end of the rotating shaft away from the evaporation plate, and a limiting toothed plate that cooperates with the positioning gear is provided above the positioning gear.

[0018] Preferably, clamping plates are symmetrically arranged on both sides of the top of the side plate. A traction rod is rotatably arranged inside the clamping plate, and a second clamping plate is rotatably arranged at the top of the traction rod. A fixing plate is arranged at the top of the clamping plate, and a traction spring is arranged at the top of the fixing plate to form a traction on the limiting tooth plate.

[0019] The beneficial effects of this utility model are:

[0020] 1. In this utility model, the mixing blades cause the airflow to swirl, increasing the flow rate. The arc design of the mixing blades can change the flow direction of the airflow, increasing the turbulence in the flow channel, so that the urea solution and the tail gas are fully mixed. The horizontal flow channel can further disturb the airflow, enhance the mixing effect, and at the same time reduce the impact force of the airflow on the mixing blades, extending the service life of the mixing blades. Thus, the ammonia gas formed is fully mixed with the tail gas, and a thorough mixture is formed before reaching the catalyst core. Through the synergistic effect of the flow channel, mixing blades, horizontal flow channel and dispersion component in the mixing assembly, the urea solution and the tail gas can be fully mixed, increasing the contact opportunity between urea and nitrogen oxides in the tail gas, improving the reaction efficiency, ensuring the uniform distribution of ammonia gas, and avoiding urea crystallization.

[0021] 2. In this utility model, the rotating shaft allows the evaporator plate to rotate within a certain angle range. The operator can adjust the deflection angle of the evaporator plate according to actual needs, which is flexible and convenient. The evaporator plate is used to disperse the urea solution, increase the contact area between the urea solution and the exhaust gas, promote the evaporation and decomposition of urea, improve reaction efficiency, and facilitate urea hydrolysis. The positioning gear is used to position the rotation angle of the evaporator plate to ensure the stability of the evaporator plate during operation. The traction rod and traction spring work together to play the role of traction and force transmission, so that the limiting tooth plate and the positioning gear are tightly meshed, preventing the evaporator plate from shaking due to airflow impact during operation. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] Figure 1 This is one of the overall three-dimensional schematic diagrams of the device in this utility model;

[0024] Figure 2 This is the second overall three-dimensional schematic diagram of the device in this utility model;

[0025] Figure 3 This is the third overall three-dimensional schematic diagram of the device in this utility model;

[0026] Figure 4 This is the fourth overall three-dimensional schematic diagram of the device in this utility model;

[0027] Figure 5 This is a three-dimensional schematic diagram of the C-shaped plate in this utility model;

[0028] Figure 6 This is a three-dimensional schematic diagram of the mixing cavity in this utility model;

[0029] Figure 7 This is a utility model Figure 4 Enlarged diagram of point A in the middle.

[0030] In the diagram: 1. Shell No. 1; 2. Shell No. 2; 3. Sealing cap; 4. Exhaust pipe; 5. Gas pipe 1; 6. Gas pipe 2; 7. Exhaust pipe; 8. Nozzle; 9. Connecting plate; 10. Positioning sleeve; 11. Fixing plate 1; 12. Fixing plate 2; 13. Sampling tube 1; 14. Sampling tube 2; 15. Filter element; 16. Catalyst element; 17. Filter plate; 18. Mixing chamber; 19. Diverter 1; 20. Diversion channel two; 21. C-shaped plate; 22. Sleeve groove; 23. Flow channel; 24. Limiting barrier; 25. Mixing blade; 26. Horizontal flow channel; 27. Stepped channel; 28. Side plate; 29. ​​Support; 30. Rotating shaft; 31. Evaporator plate; 32. Positioning gear; 33. Limiting tooth plate; 34. Clamping plate one; 35. Traction rod; 36. Clamping plate two; 37. Fixing plate; 38. Traction spring. Detailed Implementation

[0031] The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments.

[0032] like Figure 1-7 As shown, an engine exhaust aftertreatment mixing device is provided, and the device is equipped with a heating mechanism for heating a urea solution.

[0033] It includes a primary filter component, a secondary filter component, and a mixing component. The output end of the primary filter component is connected to the input end of the secondary filter component, and the mixing component is set in the area where the two are connected.

[0034] The mixing assembly includes a nozzle 8, a mixing chamber 18 disposed at the output end of the nozzle 8, a first diversion groove 19 and a second diversion groove 20 formed at the bottom of the mixing chamber 18, an inverted plate 21 disposed at the end of the mixing chamber 18 away from the nozzle 8, a fitting groove 22 formed on one side of the inverted plate 21 that matches the mixing chamber 18, a flow groove 23 formed on the other side of the inverted plate 21, a limiting barrier 24 fitted to the inner wall of the flow groove 23, and mixing blades 25 evenly distributed inside the limiting barrier 24, wherein the mixing blades 25 are arc-shaped plates. The bend in the convex surface of the horizontal flow channel 26, and several sets of stepped channels 27 symmetrically arranged on both sides of the top of the mixing chamber 18, are used to disperse urea. A dispersion component for dispersing urea is movably mounted on the stepped channels 27. The nozzle 8 is used to spray urea solution. The urea solution and exhaust gas mix within the mixing component. Urea decomposes at high temperature to produce ammonia. The ammonia reacts with nitrogen oxides in the exhaust gas, converting them into nitrogen and water, thereby reducing nitrogen oxide emissions. The mixing chamber 18 is located at the output end of the nozzle 8, providing space for the mixing of urea solution and exhaust gas. The diversion channel 19 and the diversion channel... The second groove 20 is located at the bottom of the mixing chamber 18. Its function is to divert the exhaust gas entering the mixing chamber 18, allowing it to come into more thorough contact with and mix with the urea solution, thus improving the mixing effect. The shaped plate 21 guides the airflow and further mixes the gas. The slot 22 is used to accurately connect the shaped plate 21 to the mixing chamber 18, ensuring the stability of the device structure. The flow groove 23 provides a flow channel for the mixed gas. The limiting barrier 24 limits and fixes the mixing blades 25, preventing them from shifting during operation. The blade 25 creates a swirling flow, increasing the velocity. The arc-shaped design of the mixing blade 25 alters the airflow direction, increasing turbulence within the flow channel 23 and ensuring thorough mixing of the urea solution and exhaust gas. The horizontal flow channel 26 further disrupts the airflow, enhancing mixing while reducing the impact of the airflow on the mixing blade 25, thus extending its lifespan. This ensures thorough mixing of the ammonia gas with the exhaust gas before it reaches the catalyst core 16. The stepped channel 27 provides a mounting position and support for the dispersion assembly.

[0035] In this embodiment, specifically, the primary filtration assembly includes a first housing 1. The bottom of the first housing 1 is provided with an exhaust pipe 4, a first air pipe 5, and a second air pipe 6 for air intake. The interior of the first housing 1 is provided with a filter element 15, and the top of the interior of the first housing 1 is provided with a filter plate 17, which is located below the mixing assembly. The exhaust pipe 4 is used to introduce exhaust gas from the engine. The first air pipe 5 and the second air pipe 6 can serve as backup air intake channels or be used to introduce other auxiliary gases to increase the air intake flexibility of the device. The first housing 1 is provided with a filter element 15 and a filter plate 17. The filter element 15 can perform preliminary filtration on the incoming exhaust gas to remove larger particles of impurities. The filter plate 17 is located below the mixing assembly and can further filter the exhaust gas to prevent impurities from entering the mixing assembly and affecting its normal operation.

[0036] In this embodiment, specifically, the secondary filtration component includes a second housing 2, which is located on one side of the first housing 1. The bottom of the second housing 2 is provided with an exhaust pipe 7 for exhausting gas. The interior of the second housing 2 is provided with a catalyst core 16, which is made of SCR catalyst. After the exhaust gas has undergone primary filtration and mixing treatment, it enters the second housing 2. Under the action of the catalyst core 16, the nitrogen oxides in the exhaust gas are reduced to nitrogen and water, and finally discharged through the exhaust pipe 7, thereby achieving deep purification of the exhaust gas.

[0037] In this embodiment, specifically, the tops of the first housing 1 and the second housing 2 are provided with sealing caps 3 to protect the mixing components. The sealing caps 3 protect the mixing components and prevent external impurities from entering the device and affecting its normal operation.

[0038] In this embodiment, specifically, connecting plates 9 are provided on the sides of housing 1 and housing 2 that are close to each other. Positioning sleeves 10 are provided on the outer top of housing 1 and housing 2. Fixing plates 11 and 12 are respectively provided on the outer sides of housing 1 and housing 2 for fixing. Connecting plates 9 are used to connect housing 1 and housing 2 to ensure the tightness of the connection. Positioning sleeves 10 serve to position and assist in fixing, further improving the stability of housing 1 and housing 2 when fixed. Fixing plates 11 and 12 are used to fix the entire device on other equipment to ensure the stability of the device.

[0039] In this embodiment, specifically, a sampling tube 13 is provided on the outer side of the sealing cover 3 near the second housing 2, and a sampling tube 24 is provided at the bottom end of the shaped plate 21. The sampling tube 13 is used to sample from the area between the primary filter component and the mixing component to detect the composition and state of the exhaust gas after primary filtration and preliminary mixing. The sampling tube 24 is used to detect the gas after catalytic decomposition.

[0040] In this embodiment, specifically, the dispersion component includes several sets of side plates 28 symmetrically arranged on both sides of the mixing chamber 18, with the side plates 28 located below the stepped groove 27. Supports 29 are symmetrically arranged on the top of the side plates 28, and rotating shafts 30 are rotatably arranged on the top of the supports 29. Evaporation plates 31 are arranged between the rotating shafts 30. A positioning gear 32 is arranged at the end of the rotating shaft 30 away from the evaporation plate 31. A limiting toothed plate 33, cooperating with the positioning gear 32, is arranged above the positioning gear 32. Clamping plates 34 are symmetrically arranged on both sides of the top of the side plates 28. A traction rod 35 is rotatably arranged inside the clamping plates 34. A clamping plate 36 is rotatably arranged at the top of the traction rod 35. A fixing plate 37 is arranged at the top of the clamping plates 36, and a traction puller is arranged at the top of the fixing plate 37 to traction the limiting toothed plate 33. Spring 38 and side plate 28 serve to support and fix other components. Bracket 29 supports rotating shaft 30, which allows evaporator plate 31 to rotate within a certain angle range. Operators can adjust the deflection angle of evaporator plate 31 according to actual needs, which is flexible and convenient. Evaporator plate 31 is used to disperse urea solution, increase the contact area between urea solution and exhaust gas, promote evaporation and decomposition of urea, improve reaction efficiency, and facilitate urea hydrolysis. Positioning gear 32 is used to position the rotation angle of evaporator plate 31 to ensure the stability of evaporator plate 31 during operation. Traction rod 35 and traction spring 38 work together to play the role of traction and force transmission, so that limiting tooth plate 33 and positioning gear 32 are tightly meshed to prevent evaporator plate 31 from shaking due to airflow impact during operation.

[0041] The working principle of this utility model is as follows: The exhaust gas discharged from the engine enters the first housing 1 through the exhaust pipe 4. Under the action of the filter element 15 and the filter plate 17, the larger particulate impurities in the exhaust gas are filtered out. The urea solution is sprayed into the mixing chamber 18 through the nozzle 8, and initially mixed with the exhaust gas entering the mixing chamber 18. During the mixing process, the first diversion groove 19 and the second diversion groove 20 divert the exhaust gas, allowing it to contact the urea solution more fully. The mixed gas enters the flow groove 23. Under the action of the mixing blade 25, the flow direction of the airflow is changed, and the degree of turbulence is increased, further fully mixing the urea solution and the exhaust gas. At the same time, the horizontal flow groove 26 further disturbs the airflow and enhances the mixing effect. The evaporation plate 31 in the dispersion component disperses the urea solution into finer droplets, increasing the contact area between the urea solution and the exhaust gas, promoting the evaporation and decomposition of urea. After being fully mixed and reacted, the gas enters the second housing 2. Under the action of the catalyst core 16, the harmful substances in the exhaust gas undergo a chemical reaction and are converted into harmless substances, and finally discharged through the exhaust pipe 7.

[0042] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. An engine exhaust aftertreatment mixing device, characterized in that: It includes a primary filter component, a secondary filter component, and a mixing component. The output end of the primary filter component is connected to the input end of the secondary filter component, and the mixing component is provided in the area where the two are connected. The mixing assembly includes a nozzle (8), a mixing chamber (18) disposed at the output end of the nozzle (8), a first diversion groove (19) and a second diversion groove (20) opened at the bottom of the mixing chamber (18), an inverted plate (21) disposed at the end of the mixing chamber (18) away from the nozzle (8), a fitting groove (22) opened on one side of the inverted plate (21) that matches the mixing chamber (18), and a flow groove (23) opened on the other side of the inverted plate (21). A limiting barrier (24) is fitted to the inner wall of the flow channel (23), and a mixing blade (25) is evenly distributed inside the limiting barrier (24). The mixing blade (25) is an arc-shaped plate. A horizontal flow channel (26) is opened on the protruding surface of the bending part of the mixing blade (25). Several sets of stepped channels (27) are symmetrically opened on both sides of the top of the mixing tube (18). A dispersion component for dispersing urea is movably set on the stepped channel (27).

2. An engine exhaust aftertreatment mixing device as in claim 1, wherein, The primary filter assembly includes a first housing (1), and the bottom of the first housing (1) is provided with an exhaust pipe (4), an air pipe one (5) and an air pipe two (6) for air intake.

3. An engine exhaust aftertreatment mixing device as in claim 2, wherein, The secondary filter assembly includes a second housing (2), which is located on one side of the first housing (1). The bottom of the second housing (2) is provided with an exhaust pipe (7) for exhausting air.

4. An engine exhaust aftertreatment mixing device as in claim 3, wherein, The top of the first housing (1) and the second housing (2) are provided with sealing caps (3) for protecting the mixing components.

5. The engine exhaust aftertreatment mixing device of claim 3, wherein, The first shell (1) and the second shell (2) are provided with a connecting plate (9) that cooperates with each other on the side that is close to each other. The first shell (1) and the second shell (2) are provided with a positioning sleeve (10) on the top outer side. The first shell (1) and the second shell (2) are respectively provided with a fixing plate one (11) and a fixing plate two (12) for fixing.

6. An engine exhaust aftertreatment mixing device as in claim 4, wherein, The sealing cover (3) is provided with a sampling tube one (13) on the outside of the second shell (2), and the bottom end of the shaped plate (21) is provided with a sampling tube two (14).

7. An engine exhaust aftertreatment mixing device as in claim 4, wherein, The first housing (1) is provided with a filter element (15), the second housing (2) is provided with a catalyst element (16), and the top of the first housing (1) is provided with a filter plate (17), which is located below the mixing component.

8. The engine exhaust aftertreatment mixing device of claim 1, wherein, The dispersion component includes several sets of side plates (28) symmetrically arranged on both sides of the mixing cavity (18), and the side plates (28) are located below the stepped groove (27). The top of the side plates (28) is symmetrically provided with a bracket (29), and the top of the bracket (29) is rotatably provided with a rotating shaft (30).

9. An engine exhaust aftertreatment mixing device as in claim 8, wherein, An evaporation plate (31) is provided between the rotating shafts (30). A positioning gear (32) is provided at the end of the rotating shaft (30) away from the evaporation plate (31). A limiting toothed plate (33) that cooperates with the positioning gear (32) is provided above the positioning gear (32).

10. The engine exhaust aftertreatment mixing device of claim 9, wherein, The side plate (28) is symmetrically provided with clamping plate one (34) on both sides of the top. A traction rod (35) is rotatably provided inside the clamping plate one (34). A clamping plate two (36) is rotatably provided at the top of the traction rod (35). A fixing plate (37) is provided at the top of the clamping plate two (36). A traction spring (38) is provided at the top of the fixing plate (37) to form a traction on the limiting tooth plate (33).

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