Split-flow urea mixer

Abstract

The present invention discloses a split-flow outlet urea mixer. A front baffle, a mixing and crushing assembly, and a rear baffle are sequentially arranged in the cylinder from the air inlet end to the air outlet end. The front baffle is provided with an air inlet connected to the air inlet chamber, and the rear baffle is provided with an air outlet connected to the air outlet chamber. A crushing assembly is provided in the mixing chamber. The mixing and crushing assembly is provided with an air inlet channel and at least two split channels. When in use, the air flow in the mixing chamber is split by the split channels and then flows out from the air outlet channel. After the tail gas flow of the present invention is mixed with urea droplets in the mixing chamber, it is split by the split channels and then flows out from the corresponding air outlet channel. The urea droplets are guided and dispersed to different parts of the mixing chamber under the entrainment of the air flow, thereby avoiding the situation where the urea droplets gather at the bottom of the mixer and reducing the risk of urea crystals forming at the bottom of the mixer.

Description

Technical Field

[0001] The invention relates to the technical field of engine tail gas post-processing, in particular to a split-flow outlet type urea mixer. Background Art

[0002] At present, in the engine exhaust after-treatment system, selective catalytic reduction technology (SCR) is usually used for after-treatment. Urea aqueous solution is sprayed into the exhaust after-treatment mixer, and under the action of the catalyst, nitrogen oxides (NO X ) is reduced to harmless nitrogen (N2) and water (H2O), thereby reducing emissions.

[0003] Due to the constraints of its overall structure, the urea droplets sprayed from the urea nozzle of the straight-cylinder after-treatment system have a short distance from entering the mixer to reaching the SCR carrier. Moreover, the urea nozzle of the straight-cylinder after-treatment system is usually arranged on the upper side, so that after the urea droplets enter the mixer, they will quickly gather to the bottom under the action of airflow and gravity, and easily form urea crystals at the bottom of the mixer, affecting the performance of the after-treatment system. What's worse, it may cause excessive emissions or blockage of the after-treatment system, resulting in insufficient vehicle power. Summary of the Invention

[0004] In view of the shortcomings of the above-mentioned existing urea mixing devices, the applicant provides a urea mixer with a rational structure and a split-flow outlet, which reduces the risk of urea crystallization and ensures the performance of the post-treatment system.

[0005] The technical solutions adopted in the present invention are as follows:

[0006] A split-flow and air-outlet type urea mixer, in which a front baffle, a mixing and crushing assembly, and a rear baffle are sequentially arranged in the cylinder from the air inlet end to the air outlet end, the cavity between the front baffle and the mixing and crushing assembly is the air inlet cavity, the inner cavity of the mixing and crushing assembly is the mixing cavity, and the cavity between the mixing and crushing assembly and the rear baffle is the air outlet cavity; an air inlet connected to the air inlet cavity is provided on the front baffle, and an air outlet connected to the air outlet cavity is provided on the rear baffle; a crushing assembly is provided in the mixing cavity; an air inlet channel and at least two split channels are provided on the mixing and crushing assembly, the air inlet channel connects the air inlet cavity and the mixing cavity, and each split channel connects the air outlet cavity through the air outlet channel. When in use, the airflow in the mixing cavity is split by the split channel and flows out from the air outlet channel.

[0007] As a further improvement of the above technical solution:

[0008] The mixing and crushing component is provided with at least one vertical branch channel and at least two branch channels arranged obliquely downward.

[0009] The two inclined branch channels are located on opposite sides of the vertical branch channel; and the angle between the two inclined branch channels is 100-130 degrees.

[0010] The mixing chamber of the mixing and crushing component is formed by the air intake clam shell and the air outlet clam shell arranged face to face, and the two opposite sides of the air intake clam shell and the air outlet clam shell are respectively connected to the cylinder through support plates; the air intake clam shell is provided with a front air intake part, a first front diverter part, a second front diverter part, and a third front diverter part, and the air outlet clam shell is correspondingly provided with a rear air intake part, a first rear diverter part, a second rear diverter part, and a third rear diverter part. The front air intake part and the rear air intake part form an air intake duct respectively, and the first front diverter part, the second front diverter part, the third front diverter part and the first rear diverter part, the second rear diverter part, and the third rear diverter part respectively form diversion ducts; an air intake channel is opened on the wall of the front air intake part of the air intake clam shell, and air outlet channels are opened on the walls of the first rear diverter part, the second rear diverter part, and the third rear diverter part of the air outlet clam shell.

[0011] The first front splitter, the second front splitter and the third front splitter are respectively provided with a first notch; the front air intake portion, the first front splitter, the second front splitter and the third front splitter are all semi-cylindrical or semi-elliptical cylindrical, bulging outward toward the air intake end; the rear air intake portion, the first rear splitter, the second rear splitter and the third rear splitter are all semi-cylindrical or semi-elliptical cylindrical, bulging outward toward the air outlet end.

[0012] The crushing assembly includes a crushing cylinder and a crushing plate arranged up and down.

[0013] The upper part of the crushing cylinder is a straight cylinder, and the lower part is a conical cylinder. The bottom of the conical cylinder has a bottom surface; a second notch is provided on the straight cylinder, facing the air intake channel of the air intake clam shell; the conical cylinder is a conical cylinder with a larger upper part and a smaller lower part, and a number of first crushing holes are provided on the conical surface; a center hole and a number of second crushing holes are provided on the bottom surface, and the aperture of the center hole is larger than the aperture of the second crushing hole.

[0014] The crushing plate is a V-shaped plate with an opening facing downwards, and a plurality of third crushing holes are provided on the plate surfaces on both sides of the crushing plate; the inclination angles of the plates on both sides of the crushing plate are consistent with the inclination angles of the diversion channels on both sides.

[0015] The air inlet channel of the mixing and crushing component and the air inlet port of the front baffle are arranged up and down, with the air inlet port located at a low position and the air inlet channel located at a high position.

[0016] The bottom and two opposite sides of the rear baffle are respectively provided with air outlets; the front baffle is provided with a plurality of first reinforcing ribs, and the rear baffle is provided with a plurality of second reinforcing ribs; a nozzle seat is provided on the cylinder body, facing the mixing chamber.

[0017] The beneficial effects of the present invention are as follows:

[0018] In the present invention, after the exhaust gas flow is mixed with the urea droplets in the mixing chamber, it is diverted through the branch channel and then flows out from the corresponding air outlet channel. The urea droplets are guided and dispersed to different parts of the mixing chamber under the entrainment of the air flow, thereby avoiding the situation where the urea droplets gather at the bottom of the mixer and reducing the risk of urea crystals forming at the bottom of the mixer. Moreover, the urea droplets are dispersed in the mixing chamber, which is more conducive to fully mixing with the air flow, fully absorbing heat to volatilize and pyrolyze, thereby improving the decomposition efficiency of ammonia and further improving the mixing uniformity of the decomposed ammonia and the air flow.

[0019] The angle setting of the two inclined flows in the present invention not only facilitates the formation of the air inlet clam shell and the air outlet clam shell, but also ensures that the urea droplets are better and more evenly diverted to the three diversion channels under the action of air flow disturbance and gravity. The urea droplet diversion effect is better, and the aggregation of urea droplets to form urea crystals is avoided, which is more conducive to reducing the risk of urea crystallization.

[0020] The air intake and diversion parts of the air intake and outlet clam shells of the present invention are set to be semi-cylindrical or semi-elliptical, which facilitates the smooth transition of the air intake and outlet clam shells and reduces the difficulty of molding. The semi-elliptical cylinder also ensures that the air intake cross-sectional area and the thickness of the mixing and crushing component both meet the design requirements through the different lengths of the semi-elliptical cylinder in two directions.

[0021] The conical portion of the crushing barrel of the present invention not only shatters urea droplets but also compresses airflow toward the center, converging and flowing downward. The multiple secondary crushing holes and central hole on the bottom surface not only shatter urea droplets but also provide a large flow area, allowing urea droplets to pass through smoothly. Furthermore, the conical surface of the barrel squeezes urea droplets more easily through the secondary crushing holes and central hole, preventing urea droplets from accumulating inside the crushing barrel and forming urea crystals, thereby reducing the risk of urea crystallization. The second notch in the straight portion ensures unobstructed air intake, reducing intake backpressure.

[0022] The V-shaped crushing plate of the present invention has two side plates that are tilted downward. The crushed urea droplets are accelerated along the crushing plate surface under the action of airflow and gravity, preventing the urea droplets from accumulating on the crushing plate. The crushing plate can guide the mixed airflow in the mixing chamber to the diverter channels on both sides, so that most of the airflow flows out from the diverter channels on both sides, reducing the airflow at the bottom of the straight-through mixer, thereby reducing the amount of urea droplets at the bottom of the straight-through mixer and reducing the risk of urea crystals forming at the bottom of the mixer. The V-shaped crushing plate's diversion effect can ensure that the outlet airflow of the three diverter channels remains basically consistent, improving the consistency of the outlet air.

[0023] The air inlet channel of the air inlet clamshell of the present invention and the air inlet port of the front baffle are arranged up and down, so that the exhaust gas flow can obtain the longest possible air inlet space. After the air flow enters the air inlet cavity from the air inlet, it turns to flow upward to the air inlet channel and then turns to flow into the mixing cavity. The raised outer wall surface of the air inlet clamshell can also guide the air flow, so that the air flow continuously changes direction upward, thereby forming a turbulent flow. After the air flow enters the mixing cavity, it can quickly mix with the urea droplets, which is beneficial for the urea droplets to quickly absorb heat and volatilize and decompose, thereby improving the decomposition efficiency of the urea droplets. The first notches of the first front diverter, the second front diverter, and the third front diverter can introduce the exhaust gas flow to sweep the inner wall surface of the cylinder, preventing the urea droplets from gathering on the inner wall surface of the cylinder to form urea crystals, thereby reducing the risk of urea crystals.

[0024] The air outlet at the bottom of the rear baffle of the present invention can directly carry out the urea droplets at the bottom of the mixer under the action of the airflow, preventing the urea droplets from depositing and forming urea knots. The air outlets on both sides can make the airflow have the effect of swinging out to both sides, thereby forming a strong rotating airflow and improving the mixing uniformity of the ammonia.

[0025] The reinforcing rib structure of the front baffle and the rear baffle of the present invention can improve the strength and prevent the two from deforming after welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a perspective view of the present invention.

[0027] Figure 2 It is a three-dimensional diagram from another perspective of the present invention.

[0028] Figure 3 It is an exploded view of the present invention.

[0029] Figure 4 It is a cross-sectional view of the present invention.

[0030] Figure 5 for Figure 4 Cross-sectional view of section AA.

[0031] Figure 6 A three-dimensional diagram of the mixing and crushing component.

[0032] Figure 7 This is a stereoscopic image of the hybrid crushing component from another perspective.

[0033] Figure 8 It is a three-dimensional diagram of the crushing cylinder.

[0034] In the figure: 1, cylinder; 2, nozzle seat; 3, front baffle; 31, air inlet; 32, first reinforcing rib; 4, rear baffle; 41, air outlet; 42, second reinforcing rib;

[0035] 100. Mixing and crushing assembly; 5. Air intake shell; 51. Front air intake section; 511. Air intake channel; 52. First front diverter section; 53. Second front diverter section; 54. Third front diverter section; 55. First notch; 6. Air outlet shell; 61. Rear air intake section; 62. First rear diverter section; 63. Second rear diverter section; 64. Third rear diverter section; 65. Air outlet channel; 7. Support plate; 8. Crushing cylinder; 81. Straight cylinder section; 811. Second notch; 82. Conical cylinder section; 821. First crushing hole; 83. Bottom surface; 831. Center hole; 832. Second crushing hole; 9. Crushing plate; 91. Third crushing hole;

[0036] 10. Air inlet chamber; 20. Mixing chamber; 30. Air outlet chamber; 40. Air inlet duct; 50. Diverter duct. DETAILED DESCRIPTION

[0037] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0038] like Figures 1 to 4 As shown, the cylinder 1 of the present invention is provided with a front baffle 3, a mixing and crushing assembly 100, and a rear baffle 4 in sequence from the air inlet end to the air outlet end; in the cylinder 1, the cavity between the front baffle 3 and the mixing and crushing assembly 100 is the air inlet cavity 10, the cavity inside the mixing and crushing assembly 100 is the mixing cavity 20, and the cavity between the mixing and crushing assembly 100 and the rear baffle 4 is the air outlet cavity 30. Figure 1 、 Figure 4 As shown, an air inlet 31 is provided on the lower surface of the front baffle 3, and the air inlet 31 is connected to the air inlet cavity 10. Figure 2 、 Figure 4 As shown, an air outlet 41 is provided on the surface of the rear baffle 4, and the air outlet 41 is connected to the air outlet cavity 30. Figure 4 As shown, a nozzle holder 2 is provided on the cylinder 1 facing the mixing chamber 20 , and a urea nozzle (not shown in the figure) is provided in the nozzle holder 2 , which can spray urea droplets into the mixing chamber 20 .

[0039] like Figure 3 As shown, the mixing and crushing assembly 100 includes an air inlet shell 5, an air outlet shell 6, a support plate 7, a crushing cylinder 8 and a crushing plate 9. Figure 3 、 Figure 4 As shown, the air inlet shell 5 and the air outlet shell 6 are arranged face to face, as shown in FIG. Figure 4 、 Figure 5 As shown, the cavity enclosed between the air inlet shell 5 and the air outlet shell 6 is the mixing chamber 20, and the crushing cylinder 8 and the crushing plate 9 are arranged between the air inlet shell 5 and the air outlet shell 6 and located in the mixing chamber 20. Figure 5 As shown, the two opposite sides of the air inlet clam shell 5 and the air outlet clam shell 6 are connected to the inner wall surface of the cylinder 1 through support plates 7 respectively.

[0040] like Figure 3 、 Figure 6 As shown, the upper part of the air intake clam shell 5 extends vertically upward to form a front air intake portion 51, the lower part extends vertically downward to form a first front diverter portion 52, and the two opposite sides of the lower part extend symmetrically downward to form a second front diverter portion 53 and a third front diverter portion 54; the angle between the front air intake portion 51 and the second front diverter portion 53 / the third front diverter portion 54 is 100-130°, preferably 120°, which facilitates the molding of the air intake clam shell 5 while ensuring that the urea droplets are better and more evenly diverted to the three diversion channels 50 under the action of air flow disturbance and gravity, and the urea droplet diversion effect is better, avoiding the aggregation of urea droplets to form urea crystals, and is more conducive to reducing the risk of urea crystallization. The front air intake portion 51, the first front diverter portion 52, the second front diverter portion 53, and the third front diverter portion 54 are all semi-cylindrical in shape, bulging outward toward the air intake end, to facilitate the smooth transition of the air intake clam shell 5 and reduce the difficulty of forming; in other embodiments, the front air intake portion 51, the first front diverter portion 52, the second front diverter portion 53, and the third front diverter portion 54 can also be a bulging semi-elliptical cylinder, which reduces the difficulty of forming while ensuring that the air intake cross-sectional area and the thickness of the mixing and crushing assembly 100 both meet the design requirements through the different lengths of the semi-elliptical cylinder in two directions; the outer edges of the front air intake portion 51, the first front diverter portion 52, the second front diverter portion 53, and the third front diverter portion 54 are respectively welded and fixed on the inner wall surface of the cylinder 1. An air intake channel 511 is provided on the wall of the front air intake portion 51, and the air intake channel 511 connects the air intake chamber 10 and the mixing chamber 20; the air intake channel 511 and the air intake port 31 of the front baffle 3 are arranged up and down, the air intake port 31 is located at the lowest position, and the air intake channel 511 is located at a high position, so that the exhaust gas flow can obtain as long an air intake space as possible. After the air flow enters the air intake chamber 10 from the air intake port 31, it turns to flow upward to the air intake channel 511 and then turns to flow into the mixing chamber 20. The raised outer wall surface of the air intake clam shell 5 will also guide the air flow, so that the air flow continues to change direction upward, thereby forming a turbulent flow in the air flow. After the air flow enters the mixing chamber 20, it can quickly mix with the urea droplets, which is beneficial to the rapid absorption of heat and volatilization and decomposition of the urea droplets, thereby improving the decomposition efficiency of the urea droplets. A first notch 55 is respectively provided on the outer edges of the first front diverter portion 52, the second front diverter portion 53, and the third front diverter portion 54. The first notch 55 can introduce exhaust gas flow to sweep the inner wall surface of the cylinder 1, thereby preventing urea droplets from gathering on the inner wall surface of the cylinder 1 and forming urea crystals, thereby reducing the risk of urea crystallization.

[0041] like Figure 3 、 Figure 7 As shown, the air outlet clam shell 6 is similar in structure to the air inlet clam shell 5, and is respectively provided with a rear air inlet portion 61, a first rear diverter portion 62, a second rear diverter portion 63, and a third rear diverter portion 64 corresponding to the air inlet clam shell 5. The rear air inlet portion 61, the first rear diverter portion 62, the second rear diverter portion 63, and the third rear diverter portion 64 are all semi-cylindrical or semi-elliptical cylindrical in shape convex toward the air outlet end; as shown in FIG. Figure 5、 Figure 6 As shown, the rear air intake portion 61 and the front air intake portion 51 are relatively surrounded by a vertical air intake duct 40, and the nozzle seat 2 is opposite to the air intake duct 40; the first rear diverter portion 62, the second rear diverter portion 63, and the third rear diverter portion 64 and the first front diverter portion 52, the second front diverter portion 53, and the third front diverter portion 54 are respectively relatively surrounded by three diverter channels 50: one is arranged vertically at the bottom, and the two are arranged obliquely downward on opposite sides. The extended length of the first rear diverter portion 62 / the second rear diverter portion 63 / the third rear diverter portion 64 is shorter than that of the first front diverter portion 52 / the second front diverter portion 53 / the third front diverter portion 54, and air outlet channels 65 are respectively formed on the outer sides of the outer edges of the first rear diverter portion 62, the second rear diverter portion 63, and the third rear diverter portion 64, and the air outlet channels 65 connect the diverter channel 50 and the air outlet cavity 30; in other embodiments, the outer edges of the first rear diverter portion 62, the second rear diverter portion 63, and the third rear diverter portion 64 can also extend to the inner wall surface of the cylinder 1, and then the air outlet channels 65 are opened on the wall surfaces of the first rear diverter portion 62, the second rear diverter portion 63, and the third rear diverter portion 64. After the exhaust gas flow is mixed with the urea droplets in the mixing chamber 20, it is diverted through the three branch channels 50 and then flows out from the corresponding outlet channels 65. The urea droplets are guided and dispersed to different parts of the mixing chamber 20 under the entrainment of the air flow, thereby avoiding the situation where the urea droplets gather at the bottom of the mixer and reducing the risk of urea crystals forming at the bottom of the mixer. Moreover, the urea droplets are dispersed in the mixing chamber 20, which is more conducive to fully mixing with the air flow, fully absorbing heat for volatilization and pyrolysis, thereby improving the decomposition efficiency of ammonia and further improving the mixing uniformity of the decomposed ammonia and the air flow.

[0042] like Figure 8 As shown, the upper portion of the crushing cylinder 8 is a straight cylinder portion 81, and the lower portion is a tapered cylinder portion 82. The bottom of the tapered cylinder portion 82 has a bottom surface 83. Figure 4 As shown, the straight cylinder portion 81 is welded and fixed to the air intake clam shell 5. A second notch 811 is provided on the straight cylinder portion 81, facing the air intake channel 511 of the air intake clam shell 5, to ensure the smooth flow of the air intake channel 511 and reduce the intake back pressure. The conical cylinder portion 82 is a conical cylinder with a larger upper portion and a smaller lower portion. A plurality of first crushing holes 821 are provided on the conical surface. The conical cylinder portion 82 can not only crush the urea droplets, but also squeeze the airflow to the middle portion to gather and flow downward. A central hole 831 and a plurality of second crushing holes 832 are provided on the bottom surface 83. The aperture of the central hole 831 is larger than that of the second crushing holes 832. The plurality of second crushing holes 832 and the central hole 831 can crush the urea droplets while ensuring a large flow area, so that the urea droplets can pass through smoothly. Moreover, under the extrusion effect of the conical surface of the conical cylinder 82, the urea droplets are more likely to pass through the plurality of second crushing holes 832 and the central hole 831, thereby preventing the urea droplets from being deposited in the crushing cylinder 8 and forming urea crystals, thereby reducing the risk of urea crystallization.

[0043] like Figure 3 、 Figure 5 As shown, the crushing plate 9 is a downward-facing V-shaped plate with a plurality of third crushing holes 91 formed on its two side surfaces. The crushing plate 9 further crushes the urea droplets, allowing them to absorb heat and volatilize and decompose. The two side plates of the V-shaped crushing plate 9 are tilted downward. Under the action of airflow and gravity, the crushed urea droplets are accelerated along the plate surface of the crushing plate 9, preventing the urea droplets from depositing on the crushing plate 9. The inclination angles of the two side plates of the crushing plate 9 are consistent with the inclination angles of the two side diverter channels 50. The crushing plate 9 can guide the mixed airflow from the mixing chamber 20 to the diverter channels 50 on both sides, so that most of the airflow flows out from the diverter channels 50, reducing the airflow at the bottom of the straight-through mixer, thereby reducing the amount of urea droplets at the bottom of the straight-through mixer and the risk of urea crystals forming at the bottom of the mixer. The diversion effect of the V-shaped crushing plate 9 can ensure that the outlet airflow of the three diverter channels 50 is basically consistent, improving the consistency of the air output.

[0044] like Figure 2 、 Figure 3 As shown, air outlets 41 are respectively provided at the bottom and opposite sides of the rear baffle 4. The air outlet 41 at the bottom can directly carry out the urea droplets at the bottom of the mixer under the action of the airflow, thereby preventing the urea droplets from depositing and forming urea knots. The air outlets 41 on both sides can make the airflow produce the effect of throwing it out to both sides, thereby forming a strong rotating airflow and improving the mixing uniformity of the ammonia.

[0045] like Figure 1 、 Figure 2 As shown, a plurality of first reinforcing ribs 32 are provided on the front baffle 3, and a plurality of second reinforcing ribs 42 are provided on the rear baffle 4. The reinforcing rib structure can improve the strength of the front baffle 3 and the rear baffle 4 and prevent the two from deforming after welding.

[0046] When the present invention is actually used, the exhaust gas enters the air intake chamber 10 from the air inlet 31, moves upward along the air intake clam shell 5, enters the mixing chamber 20 from the air intake channel 511, forms a turbulent flow in the mixing chamber 20, and is fully mixed with the urea droplets sprayed from the urea nozzle. Then, it moves downward, is crushed by the crushing cylinder 8 and the crushing plate 9 in turn, and flows out from the three branch channels 50 to the air outlet chamber 30, and then flows out from the air outlet 41.

[0047] The above description is an explanation of the present invention, not a limitation of the present invention. The present invention may be modified in any form without violating the spirit of the present invention.

Claims

1. A split-flow outlet type urea mixer, wherein a front baffle (3), a mixing and crushing assembly (100), and a rear baffle (4) are sequentially arranged in a cylinder (1) from an air inlet end to an air outlet end, a cavity between the front baffle (3) and the mixing and crushing assembly (100) being an air inlet cavity (10), an inner cavity of the mixing and crushing assembly (100) being a mixing cavity (20), and a cavity between the mixing and crushing assembly (100) and the rear baffle (4) being an air outlet cavity (30); an air inlet (31) communicating with the air inlet cavity (10) is formed on the front baffle (3), and an air outlet (41) communicating with the air outlet cavity (30) is formed on the rear baffle (4); and the characteristics are: A crushing assembly is provided in the mixing chamber (20); an air inlet channel (511) and at least two branch channels (50) are provided on the mixing and crushing assembly (100); the air inlet channel (511) communicates with the air inlet chamber (10) and the mixing chamber (20); each branch channel (50) communicates with the air outlet chamber (30) via an air outlet channel (65); when in use, the air flow in the mixing chamber (20) is divided by the branch channel (50) and then flows out from the air outlet channel (65); The mixing and crushing assembly (100) is provided with at least one vertical branch channel (50) and at least two branch channels (50) arranged obliquely downward; The mixing chamber (20) of the mixing and crushing assembly (100) is formed by an air intake shell (5) and an air outlet shell (6) arranged face to face, and the two opposite waist sides of the air intake shell (5) and the air outlet shell (6) are connected to the cylinder (1) through support plates (7) respectively; the air intake shell (5) is provided with a front air intake portion (51), a first front diversion portion (52), a second front diversion portion (53), and a third front diversion portion (54); the air outlet shell (6) is provided with a rear air intake portion (61), a first rear diversion portion (62), a second rear diversion portion (63), and a third rear diversion portion (64), and the front air intake portion (51) is provided with a first front diversion portion (52), a second front diversion portion (53), and a third front diversion portion (54). The first front splitter portion (52), the second front splitter portion (53), the third front splitter portion (54) and the first rear splitter portion (62), the second rear splitter portion (63), the third rear splitter portion (64) respectively enclose the splitter portion (50); an air intake channel (511) is provided on the wall surface of the front air intake portion (51) of the air intake clam shell (5), and an air outlet channel (65) is provided on the wall surface of the first rear splitter portion (62), the second rear splitter portion (63), and the third rear splitter portion (64) of the air outlet clam shell (6); The crushing assembly comprises a crushing cylinder (8) and a crushing plate (9) arranged in an upper and lower manner. The crushing plate (9) is a V-shaped plate with an opening facing downward, and a plurality of third crushing holes (91) are provided on both side surfaces of the plate. The inclination angles of the two side plates of the crushing plate (9) are consistent with the inclination angles of the two side diversion channels (50).

2. The split-flow outlet type urea mixer according to claim 1, characterized in that: The two inclined branch channels (50) are located on opposite sides of the vertical branch channel (50); the angle between the two inclined branch channels (50) is 100-130°.

3. The split-flow outlet type urea mixer according to claim 1, characterized in that: The first front splitter (52), the second front splitter (53), and the third front splitter (54) are respectively provided with a first notch (55); the front air intake portion (51), the first front splitter (52), the second front splitter (53), and the third front splitter (54) are all semi-cylindrical or semi-elliptical cylindrical in shape, bulging outwards toward the air intake end; and the rear air intake portion (61), the first rear splitter (62), the second rear splitter (63), and the third rear splitter (64) are all semi-cylindrical or semi-elliptical cylindrical in shape, bulging outwards toward the air outlet end.

4. The split-flow outlet type urea mixer according to claim 1, characterized in that: The upper part of the crushing cylinder (8) is a straight cylinder (81), and the lower part is a conical cylinder (82), and the bottom of the conical cylinder (82) has a bottom surface (83); a second notch (811) is provided on the straight cylinder (81) and directly opposite the air inlet passage (511) of the air inlet clam shell (5); the conical cylinder (82) is a conical cylinder with a larger upper portion and a smaller lower portion, and a plurality of first crushing holes (821) are provided on the conical surface; a central hole (831) and a plurality of second crushing holes (832) are provided on the bottom surface (83), and the aperture of the central hole (831) is larger than the aperture of the second crushing hole (832).

5. The split-flow outlet type urea mixer according to claim 1, characterized in that: The air inlet channel (511) of the mixing and crushing assembly (100) and the air inlet (31) of the front baffle (3) are arranged vertically, with the air inlet (31) being located at a lower position and the air inlet channel (511) being located at a higher position.

6. The split-flow outlet type urea mixer according to claim 1, characterized in that: The rear baffle (4) is provided with air outlets (41) at the bottom and on two opposite sides; the front baffle (3) is provided with a plurality of first reinforcing ribs (32), and the rear baffle (4) is provided with a plurality of second reinforcing ribs (42); and a nozzle seat (2) is provided on the cylinder (1) facing the mixing chamber (20).

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