CN215521022U - Sleeve pipe shunting urea mixing arrangement - Google Patents

Abstract

The utility model discloses a sleeve shunting type urea mixing device, which comprises a rear clam shell end cover and a front clam shell end cover which are connected with each other, wherein the rear clam shell end cover and the front clam shell end cover form a hollow cavity, the front clam shell end cover is provided with an inlet and an outlet, the device also comprises a mixing assembly positioned in the cavity, the mixing assembly comprises a nozzle base, a cyclone tube assembly, a partition plate, a guide plate and a cyclone plate, one end of the nozzle base is fixedly connected with one end of the cyclone tube assembly, and the other end of the nozzle base is fixedly connected with the rear clam shell end cover and is communicated with an external urea nozzle; the baffle plate is connected with the cyclone tube component in a sleeved mode; the guide plate is positioned on one side of the cyclone tube assembly, which is far away from the nozzle base, and is fixedly connected with the rear clam shell end cover; the rotational flow plate is fixedly connected with the outlet; the nozzle base is positioned at one end, close to the inlet, in the rear clam shell end cover; the guide plate is positioned at one end, close to the outlet, in the rear clam shell end cover. The device has promoted the reposition of redundant personnel effect and the crushing effect of urea, and then improves the decomposition rate of urea and reduces the crystallization risk.

Description

Sleeve pipe shunting urea mixing arrangement

Technical Field

The utility model belongs to the technical field of diesel engine tail gas aftertreatment, and particularly relates to a sleeve split-flow urea mixing device.

Background

In the application technology of an SCR (Selective Catalytic Reduction) system, the key in the whole development process is how to uniformly mix the injected urea and the engine exhaust gas and complete the secondary crushing of the urea and reduce the crystallization risk of the urea at the mixer position. The U-shaped after-treatment device is used as a key component of an after-treatment system of a commercial vehicle in the six-emission stage of China, and a urea mixing device of the U-shaped after-treatment device is not mature.

In the related art, a common mixing unit of a urea mixer mostly uses a fin structure or a fiber unit to realize the crushing and the shunting of urea, and a pore plate or a pore tube structure is adopted to realize the mixing of urea. However, the fin structure is mostly a large fin structure due to the problems of large difficulty in processing micro fins and the like, and has limited crushing and shunting effects on urea. In recent years, a rotational flow and a double-layer hole pipe are adopted to realize the crushing and shunting of urea and the mixing action before SCR. However, because the cyclone structure has a limited ability to break urea, the orifice tube has a flow dividing effect, but is also easy to block the small orifice to cause serious urea crystallization, so that the flow dividing and decomposition of urea are difficult to be completed quickly.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: in order to overcome the defects in the prior art, the utility model provides a sleeve split-flow type urea mixing device, which aims to solve the technical problem of improving the split-flow effect and the crushing effect of urea, further improving the urea decomposition rate and reducing the risk of urea crystallization.

The technical scheme is as follows: in order to achieve the purpose, the utility model adopts the technical scheme that:

a casing split-flow type urea mixing device comprises a rear clam shell end cover and a front clam shell end cover which are connected with each other, wherein the rear clam shell end cover and the front clam shell end cover form a hollow cavity, the front clam shell end cover is provided with an inlet and an outlet, the inlet and the outlet are communicated with the inside of the rear clam shell end cover, the casing split-flow type urea mixing device also comprises a mixing assembly positioned in the cavity, the mixing assembly comprises a nozzle base, a cyclone tube assembly, a partition plate, a flow guide plate and a cyclone plate, one end of the nozzle base is fixedly connected with one end of the cyclone tube assembly, and the other end of the nozzle base is fixedly connected with the rear clam shell end cover and is communicated with an external urea nozzle; the center of the baffle plate is provided with a through hole, and the baffle plate is connected with the cyclone tube assembly in a sleeved mode through the through hole; the guide plate is positioned on one side of the cyclone tube assembly, which is far away from the nozzle base, and the guide plate is fixedly connected with the rear clam shell end cover; the cyclone plate is fixedly connected with the outlet in a matching way; the nozzle base is positioned at one end, close to the inlet, in the rear clam shell end cover; the guide plate is positioned at one end, close to the outlet, in the rear clam shell end cover; the baffle is located the middle part of spiral-flow tube subassembly, the periphery wall of baffle with the internal perisporium laminating tight fit of cavity.

Optionally, the spiral-flow tube subassembly includes outer spiral-flow tube, inwardly opened window sleeve pipe and supports the blanking cover, the inwardly opened window sleeve pipe is located the inside of outer spiral-flow tube, the inwardly opened window sleeve pipe passes through support the blanking cover with outer spiral-flow tube links firmly, support the blanking cover and be located outer spiral-flow tube is kept away from the one end of nozzle base, support the blanking cover with outer spiral-flow tube mutually perpendicular.

Optionally, the outer layer cyclone tube and the inwardly opened window sleeve are coaxial, and the ratio of the inner diameter of the outer layer cyclone tube to the outer diameter of the inwardly opened window sleeve is 6/5-3/2.

Optionally, the peripheral wall of the inlet part of the outer layer cyclone tube is provided with two rows of open cyclone fins, and the cyclone fins are uniformly arranged at intervals along the central axis of the outer layer cyclone tube; the peripheral wall of the outlet part of the outer layer cyclone tube is provided with a plurality of small holes which penetrate through the outer layer cyclone tube, and the small holes are uniformly arranged at intervals along the central axis of the outer layer cyclone tube; the inlet part of the outer cyclone tube is the part between the nozzle base and the partition plate, and the outlet part of the outer cyclone tube is the part between the support blanking cover and the partition plate.

Optionally, the length of one row of the swirl fins close to the nozzle base is greater than that of the other row, and the length direction of the swirl fins is arranged along the axial direction of the outer layer swirl tube.

Optionally, a plurality of rows of through long holes are formed in the circumferential wall of the inward opening window sleeve, the long holes are arranged along the central axis of the inward opening window sleeve at even intervals, and the length direction of the long holes is arranged along the axial direction of the inward opening window sleeve.

Optionally, the outer peripheral wall of the supporting block cover is provided with a plurality of supporting legs, the supporting legs are uniformly arranged along the central axis of the supporting block cover at intervals, and the supporting block cover fixedly connects the inward opening window sleeve with the outer layer cyclone tube through the supporting legs; the supporting plug cover is also provided with a plurality of through holes which penetrate through the supporting plug cover, and the through holes are arranged along the central axis of the supporting plug cover at even intervals.

Optionally, the supporting plug cover is close to the central position of the cyclone plate.

Optionally, the swirl plate is coaxial with the outlet; the center of the cyclone plate is provided with a through conical hole, the conical hole protrudes along the direction far away from the rear clam shell end cover, and the diameter of the conical hole is gradually reduced;

still have round open-ended notch on the whirl board, the notch is located the periphery of bell mouth, the notch is followed the even interval of axis of whirl board sets up.

Optionally, the guide plate is close to one side downward sloping setting of whirl board, back clamshell end cover still has two splitter boxes that run through, two the splitter box symmetry sets up, the splitter box is located the guide plate is kept away from one side of whirl board, the splitter box with the guide plate corresponds the setting.

Has the advantages that: compared with the prior art, the sleeve pipe shunting type urea mixing device provided by the utility model greatly improves the shunting effect and the crushing effect of urea, further improves the decomposition rate of urea and reduces the risk of urea crystallization.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:

FIG. 1 is an isometric view of a split-tube urea mixing device according to an exemplary embodiment of the present invention;

FIG. 2 is an exploded schematic view of a split-pipe urea mixing device according to an exemplary embodiment of the present disclosure;

FIG. 3 is an exploded schematic view of a mixing assembly of a split-tube urea mixing device according to an exemplary embodiment of the present disclosure;

FIG. 4 is a schematic view of a swirl tube assembly of a casing split-flow urea mixing device according to an exemplary embodiment of the present invention;

FIG. 5 is a schematic view of a swirl tube assembly of a split-tube urea mixing apparatus according to an exemplary embodiment of the present invention;

FIG. 6 is a schematic diagram illustrating the location of a mixing chamber of a split-tube urea mixing device according to an exemplary embodiment of the present invention;

FIG. 7 is an enlarged view at A of FIG. 6 of a split-tube urea mixing device in accordance with an exemplary embodiment of the present invention;

in the figure: 1. a rear clam shell end cap; 11. a shunt slot; 2. a front clam shell end cap; 21. an inlet; 22. an outlet; 3. a mixing assembly; 31. a nozzle base; 32. a swirl tube assembly; 321. an outer swirl tube; 3211. swirl fins; 3212. a small hole; 322. an inward opening window sleeve; 3221. a long hole; 323. supporting the plug cover; 324. supporting legs; 33. a partition plate; 34. a baffle; 35. a swirl plate; 351. a tapered hole; 352. a notch; 4. a first mixing chamber; 5. a second mixing chamber; 6. a third mixing chamber; 7. a fourth mixing chamber.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

The utility model is further described with reference to the following figures and examples.

As shown in fig. 1, a casing split-flow urea mixing device includes a rear clam shell end cover 1 and a front clam shell end cover 2 which are connected with each other, the rear clam shell end cover 1 and the front clam shell end cover 2 form a hollow cavity, and optionally, the connection manner of the rear clam shell end cover 1 and the front clam shell end cover 2 includes but is not limited to one of welding, riveting, gluing and bolting; as shown in fig. 2, the front clam shell end cover 2 is provided with a circular inlet 21 and a circular outlet 22, the inlet 21 and the outlet 22 are communicated with the inside of the rear clam shell end cover 1, and optionally, the inlet 21 and the outlet 22 are provided by one of, but not limited to, laser cutting, plasma cutting and milling.

As shown in fig. 2, the mixing assembly 3 is further included in the cavity, the mixing assembly 3 includes a nozzle base 31, a swirl tube assembly 32, a partition 33, a baffle 34 and a swirl plate 35, one end of the nozzle base 31 is fixedly connected to one end of the swirl tube assembly 32, and optionally, the connection manner of one end of the nozzle base 31 to one end of the swirl tube assembly 32 includes, but is not limited to, one of welding, riveting, gluing and bolting; the other end of the nozzle base 31 is fixedly connected with the rear clam shell end cover 1 and is communicated with an external urea nozzle for spraying urea into the cavity to be mixed with the waste gas, and optionally, the other end of the nozzle base 31 is connected with the rear clam shell end cover 1 in a manner including but not limited to one of welding, riveting, gluing and bolt connection; the nozzle base 31 is positioned at one end of the rear clam shell end cover 1 close to the inlet 21; the center of the partition 33 has a through hole, the partition 33 is connected with the cyclone tube assembly 32 in a sleeved manner through the through hole, and optionally, the connection manner of the partition 33 and the cyclone tube assembly 32 includes but is not limited to one of welding, riveting, gluing and bolting; the partition plate 33 is positioned in the middle of the cyclone tube assembly 32, and the outer peripheral wall of the partition plate 33 is tightly fitted with the inner peripheral wall of the cavity; the baffle 34 is positioned on one side of the swirl tube assembly 32 far away from the nozzle base 31, the baffle 34 is fixedly connected with the rear clam shell end cover 1, and optionally, the connection mode of the baffle 34 and the rear clam shell end cover 1 includes but is not limited to one of welding, riveting, gluing and bolting; a deflector 34 is positioned at one end of the rear clamshell end cover 1 near the outlet 22; the swirl plate 35 is fixedly connected with the outlet 22 in a matching manner, the outer peripheral wall of the swirl plate 35 is attached to the inner peripheral wall of the outlet 22, and optionally, the connection mode of the swirl plate 35 and the outlet 22 includes but is not limited to one of welding, riveting, gluing and bolting.

In this embodiment, through the setting of whirl pipe assembly 32 and whirl board 35, both guaranteed the mixed effect of the urea of whirl pipe assembly 32 axial direction and waste gas, guaranteed the mixing homogeneity of import 21 and export 22 axial direction again.

In this embodiment, the inlet 21 and the outlet 22 are further provided with flange flanges along the circumferential direction of the inlet 21 and the outlet 22, respectively, on the side away from the rear clam shell end cover 1, and are respectively used for connecting a DPF (Diesel Particulate Filter) and an SCR (Selective Catalytic Reduction).

In this embodiment, when the exhaust gas flow enters the mixing device, the exhaust gas flow firstly enters from the inlet 21, and forms a strong rotational flow through the swirl tube assembly 32 to enter the interior of the swirl tube assembly 32, and at the same time, urea is sprayed into the interior of the swirl tube assembly 32 from the position of the nozzle base 31 to be sufficiently and uniformly mixed with the exhaust gas; then, the urea impacts on the flow guide plate 34 along with the direction of the air flow, and the arrangement of the flow guide plate 34 is mainly used for preventing urea from being accumulated at the bottom part close to the outlet 22 in the rear clam shell end cover 1, so that crystallization is generated to influence the mixing uniformity of the urea and the waste gas; finally, the mixture is remixed by the swirl plate 35 and discharged from the outlet 22.

As an optional embodiment, as shown in fig. 3, the swirl tube assembly 32 includes an outer layer swirl tube 321, an inwardly opened window sleeve 322 and a supporting cap 323, the inwardly opened window sleeve 322 is located inside the outer layer swirl tube 321, the inwardly opened window sleeve 322 is fixedly connected with the outer layer swirl tube 321 through the supporting cap 323, optionally, the connecting manner of the inwardly opened window sleeve 322, the supporting cap 323 and the outer layer swirl tube 321 includes but is not limited to one of welding, riveting, gluing and bolting; the supporting plug 323 is located at the end of the outer swirl tube 321 remote from the nozzle base 31, i.e. near the outlet 22; support cap 323 is perpendicular to outer swirl tube 321.

In this embodiment, swirl tube assembly 32 adopts the sleeve pipe mode, has strengthened the whirl intensity between outer swirl tube 321 and inwardly opened window sleeve pipe 322, prevents that urea from hoarding in the inside of swirl tube assembly 32 and producing the urea crystallization.

As an optional implementation mode, as shown in FIG. 3, the outer swirl tube 321 is coaxial with the inward-opening window bushing 322, and the ratio of the inner diameter of the outer swirl tube 321 to the outer diameter of the inward-opening window bushing 322 is 6/5-3/2.

In this embodiment, the ratio of the inner diameter of the outer cyclone tube 321 to the outer diameter of the inwardly opened window casing 322 is 6/5, and the inner diameter of the outer cyclone tube 321 is not different from the outer diameter of the inwardly opened window casing 322 in the range of 6/5 to 3/2, so that the swirl mixing effect is not large, and the swirl mixing effect can be flexibly arranged, but is reduced when the inner diameter is less than 6/5 or is greater than 3/2.

As an optional embodiment, as shown in fig. 3, the peripheral wall of the inlet portion of the outer cyclone tube 321 has two rows of open cyclone fins 3211 for allowing the exhaust gas to enter the outer cyclone tube 321 in a high-speed rotation manner to mix with the urea, the rotating cyclone fins 3211 are uniformly spaced along the central axis of the outer cyclone tube 321, and optionally, the connection manner of the cyclone fins 3211 and the outer cyclone tube 321 includes, but is not limited to, one of machining in a machining center and integral molding; a plurality of small holes 3212 penetrating through the peripheral wall of the outlet part of the outer layer cyclone tube 321 are formed in the peripheral wall of the outlet part of the outer layer cyclone tube 321, the small holes 3212 are uniformly arranged at intervals along the central axis of the outer layer cyclone tube 321, and optionally, the small holes 3212 are formed in a machining center or formed in a punching mode; the inlet part of the outer cyclone tube 321 is the part between the nozzle base 31 and the partition plate 33, and the outlet part of the outer cyclone tube 321 is the part between the supporting cover 323 and the partition plate 33.

In this embodiment, since the urea spray is injected at a cone angle, the swirl fins 3211 enhance the swirling action of the urea spraying position and the swirling action of the urea cone spray at the wall-hitting position; the arrangement of the small holes 3212 improves the shunting and crushing effects of urea, and further improves the mixing efficiency of urea and waste gas.

As an alternative embodiment, as shown in fig. 3, the length of one row of the swirl fins 3211 near the nozzle base 31 is greater than that of the other row, and the length direction of the swirl fins 3211 is arranged along the axial direction of the outer swirl tube 321.

In this embodiment, the outer swirl tube 321 adopts two-section swirl fins 3211, and one row of swirl fins 3211 near the nozzle base 31 is longer to mainly strengthen the swirl action at the spraying position of urea, and the other row of swirl fins 3211 is shorter to strengthen the swirl action at the wall position of urea cone spraying.

As an alternative embodiment, as shown in fig. 3, the circumferential wall of the inwardly opened window bushing 322 has a plurality of rows of through-going long holes 3221, the long holes 3221 are racetrack shaped, and optionally, the long holes 3221 are cut or stamped by a machining center; the long holes 3221 are uniformly spaced along the central axis of the inwardly opened window bushing 322, and the length direction of the long holes 3221 is axially arranged along the inwardly opened window bushing 322.

In this embodiment, the arrangement of the long holes 3221 improves the flow property of the air flow between the outer layer swirl tube 321 and the inward opening window sleeve 322, thereby realizing rapid urea diversion; meanwhile, the long holes 3221 can provide a good crushing effect on urea.

As an alternative embodiment, as shown in fig. 4 and 5, the outer peripheral wall of the supporting block 323 is provided with a plurality of supporting legs 324, the supporting legs 324 are uniformly spaced along the central axis of the supporting block 323, and the supporting block 323 fixedly connects the inwardly opened window sleeve 322 with the outer layer cyclone tube 321 through the supporting legs 324; the supporting plug 323 is further provided with a plurality of through holes which penetrate through the supporting plug 323, and the through holes are uniformly arranged along the central axis of the supporting plug 323 at intervals. Optionally, the inward opening window sleeve 322 may be fixedly connected to the outer layer cyclone tube 321 by only using the supporting leg 324. The through holes in the supporting cap 323 further enhance the crushing effect on urea.

As an optional embodiment, as shown in fig. 6, the supporting cap 323 is close to the center of the swirling plate 35, so that urea can be directly led out from the center of the swirling plate 35, and uniformity of ammonia distribution on the front end surface of the SCR (Selective Catalytic Reduction) is improved.

As an alternative embodiment, shown in fig. 3, the swirl plate 35 is coaxial with the outlet 22; the center of the swirl plate 35 is provided with a tapered hole 351 therethrough, the tapered hole 351 protrudes in a direction away from the rear clam shell end cover 1, and the diameter of the tapered hole is gradually reduced, and optionally, the connection mode of the tapered hole 351 and the swirl plate 35 includes but is not limited to one of welding, riveting, gluing and integral forming; still have a circle of open-ended notches 352 on whirl plate 35, this notch 352 is cat ear type, and notch 352 is located the periphery of bell mouth 351, and notch 352 evenly separates the setting along the axis of whirl plate 35, and optional, this notch 352 and whirl plate 35's connected mode includes but not limited to one of welding, riveting, gluing and integrated into one piece.

In this embodiment, the tapered holes 351 are provided to ensure that the airflow is mainly discharged from the center of the swirl plate 35; meanwhile, notches 352 are uniformly distributed on the periphery of the cyclone plate 35, so that the passing air flow can form strong rotating air flow, the further mixing effect of urea particles is improved, and the efficiency of decomposing urea into ammonia gas and the uniformity of the ammonia gas in the front end surface distribution of the SCR (Selective Catalytic Reduction) are further ensured.

As an alternative, as shown in fig. 2 and 3, the side of the baffle 34 close to the swirl plate 35 is inclined downwards to facilitate the discharge of urea towards the outlet 22; as shown in fig. 6 and 7, two through splitter boxes 11 are further provided on the rear clam shell end cover 1, the two splitter boxes 11 are symmetrically arranged, the splitter boxes 11 are located on one side of the guide plate 34 away from the cyclone plate 35, and the splitter boxes 11 are arranged corresponding to the guide plate 34. The diversion trench 11 is arranged to make part of the air flow into the lower part of the diversion plate 34 from the two sides of the rear end of the diversion plate 34, thereby purging the urea below the diversion plate 34.

As an alternative embodiment, as shown in fig. 6, four mixing chambers are formed between the front clam shell end cover 1, the rear clam shell end cover 2 and the mixing assembly 3, respectively:

the first mixing chamber 4 consists of the upper end parts of the front clam shell end cover 1 and the rear clam shell end cover 2, the upper part of the cyclone tube assembly 32 and the partition plate 33;

the second mixing cavity 5 consists of an outer layer cyclone pipe 321 and an inward opening window sleeve 322;

the third mixing chamber 6 consists of an inward opening window sleeve 322 and a supporting plug 323;

and the fourth mixing cavity 7 consists of the lower end parts of the front clam shell end cover 1 and the rear clam shell end cover 2, the lower part of the cyclone tube assembly 32, a partition plate 33, a guide plate 34 and a cyclone plate 35.

For a better understanding of the present invention, reference is made to the following description of the utility model taken in conjunction with the accompanying drawings and a specific embodiment. It should be noted that the described embodiments are only a part of the embodiments of the present invention, and do not limit the protection scope of the present invention.

In this embodiment, in order to solve the problems of low urea decomposition rate and easy urea crystallization due to poor urea splitting and crushing effects, the operating principle of the double pipe split flow type urea mixing device described in any one of the above embodiments is used, and the device includes the following steps:

firstly, when the waste gas flow enters the mixing device, the waste gas flow firstly enters a first mixing cavity 4, and strong rotational flow is formed by swirl fins 3211 on an outer swirl tube 321 and enters a second mixing cavity 5 and a third mixing cavity 6; meanwhile, urea is sprayed into the third mixing chamber 6 from the position of the nozzle base 31, the urea is crushed and split through the inward opening window sleeve 322, the hole 3221 on the inward opening window sleeve 322 is large in opening, and the urea is not easy to accumulate in the middle of the opening, so that the urea can be uniformly split into the second mixing chamber 5 and is further easily taken away by the strong rotational flow in the second mixing chamber 5; the urea in the third mixing chamber 6, without its walls on the inner windowed sleeve 322, can then have a longer mixing distance and eventually complete further crushing and splitting on the support cap 323;

secondly, the waste gas and urea flowing out of the second mixing cavity 5 and the third mixing cavity 6 enter the fourth mixing cavity 7 and impact on the guide plate 34, and the guide plate 34 is arranged obliquely downwards so that the urea is conveniently discharged towards the outlet 22; meanwhile, the arrangement of the two splitter boxes 11 enables part of the airflow to flow into the lower part of the guide plate 34 from the two sides of the rear end of the guide plate 34, and sweeps urea below the guide plate;

step three, the mixing action of the final urea and the ammonia gas decomposed from the urea is completed by the waste gas and the urea discharged from the fourth mixing chamber 7 through the cyclone plate 35, the tapered hole 351 in the middle of the cyclone plate 35 ensures that the air flow is mainly discharged from the center of the cyclone plate 35, the notch 352 on the cyclone plate 35 can form strong rotating air flow with the passing air flow, the effect of further mixing urea particles is achieved, and meanwhile, the efficiency of decomposing the urea into the ammonia gas and the uniformity degree of the ammonia gas in the front end face distribution of the SCR (Selective Catalytic Reduction) are also ensured.

In summary, compared with the prior art, the casing pipe flow-splitting urea mixing device provided by the utility model has the advantages that the flow-splitting effect and the crushing effect of urea are greatly improved through the arrangement of the four mixing cavities, the decomposition rate of urea is further improved, and the crystallization risk of urea is reduced.

The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the utility model and these are intended to be within the scope of the utility model.

Claims (10)

1. A casing split-flow type urea mixing device comprises a rear clam shell end cover (1) and a front clam shell end cover (2) which are connected with each other, wherein the rear clam shell end cover (1) and the front clam shell end cover (2) form a cavity with a hollow interior, the front clam shell end cover (2) is provided with an inlet (21) and an outlet (22), the inlet (21) and the outlet (22) are communicated with the interior of the rear clam shell end cover (1), and the urea mixing device is characterized in that,

the urea spraying device is characterized by further comprising a mixing assembly (3) located in the cavity, wherein the mixing assembly (3) comprises a nozzle base (31), a cyclone tube assembly (32), a partition plate (33), a guide plate (34) and a cyclone plate (35), one end of the nozzle base (31) is fixedly connected with one end of the cyclone tube assembly (32), and the other end of the nozzle base (31) is fixedly connected with the rear clam shell end cover (1) and communicated with an external urea nozzle; the center of the baffle plate (33) is provided with a through hole, and the baffle plate (33) is connected with the cyclone tube assembly (32) in a sleeved mode through the through hole; the guide plate (34) is positioned on one side, away from the nozzle base (31), of the swirl tube assembly (32), and the guide plate (34) is fixedly connected with the rear clam shell end cover (1); the cyclone plate (35) is fixedly connected with the outlet (22) in a matching way;

the nozzle base (31) is positioned at one end, close to the inlet (21), in the rear clam shell end cover (1); the deflector (34) is positioned at one end of the rear clam shell end cover (1) close to the outlet (22); baffle (33) are located the middle part of whirl pipe assembly (32), the periphery wall of baffle (33) with the laminating tight fit of the interior perisporium of cavity.

2. The casing split-flow urea mixing device according to claim 1, wherein the cyclone tube assembly (32) comprises an outer cyclone tube (321), an inwardly opened window casing (322) and a supporting cap (323), the inwardly opened window casing (322) is located inside the outer cyclone tube (321), the inwardly opened window casing (322) is fixedly connected with the outer cyclone tube (321) through the supporting cap (323), the supporting cap (323) is located at one end of the outer cyclone tube (321) far away from the nozzle base (31), and the supporting cap (323) is perpendicular to the outer cyclone tube (321).

3. The casing split-flow urea mixing device according to claim 2, wherein the outer swirl tube (321) is coaxial with the inwardly opened window casing (322), and the ratio of the inner diameter of the outer swirl tube (321) to the outer diameter of the inwardly opened window casing (322) is 6/5-3/2.

4. The casing split-flow urea mixing device according to claim 2, wherein the peripheral wall of the inlet part of the outer swirl tube (321) is provided with two rows of open swirl fins (3211), and the swirl fins (3211) are uniformly spaced along the central axis of the outer swirl tube (321); the peripheral wall of the outlet part of the outer layer cyclone tube (321) is provided with a plurality of small holes (3212) which penetrate through, and the small holes (3212) are uniformly arranged at intervals along the central axis of the outer layer cyclone tube (321);

the inlet part of the outer layer cyclone tube (321) is the part between the nozzle base (31) and the partition plate (33), and the outlet part of the outer layer cyclone tube (321) is the part between the support blocking cover (323) and the partition plate (33).

5. The casing split-flow urea mixing device according to claim 4, wherein the length of one row of the swirl fins (3211) close to the nozzle base (31) is greater than that of the other row, and the length direction of the swirl fins (3211) is arranged along the axial direction of the outer layer swirl tube (321).

6. The casing split-flow urea mixing device according to claim 2, wherein the circumferential wall of the inwardly opened window casing (322) has a plurality of rows of through-going long holes (3221), the long holes (3221) are uniformly spaced along the central axis of the inwardly opened window casing (322), and the length direction of the long holes (3221) is arranged along the axial direction of the inwardly opened window casing (322).

7. The casing split-flow urea mixing device according to claim 2, wherein the outer peripheral wall of the supporting block cover (323) is provided with a plurality of supporting legs (324), the supporting legs (324) are uniformly spaced along the central axis of the supporting block cover (323), and the supporting block cover (323) fixedly connects the inward-opening window casing (322) with the outer cyclone pipe (321) through the supporting legs (324);

the supporting plug cover (323) is further provided with a plurality of through holes which penetrate through the supporting plug cover, and the through holes are arranged along the central axis of the supporting plug cover (323) at even intervals.

8. A casing split-flow urea mixing device according to claim 2, characterized in that said supporting cap (323) is located close to the center of said swirl plate (35).

9. A casing split-flow urea mixing device according to claim 1, characterized in that said swirl plate (35) is coaxial with said outlet (22); the center of the cyclone plate (35) is provided with a through conical hole (351), the conical hole (351) protrudes along the direction far away from the rear clam shell end cover (1), and the diameter of the conical hole is gradually reduced;

the cyclone plate (35) is also provided with a circle of open notches (352), the notches (352) are positioned at the periphery of the conical hole (351), and the notches (352) are uniformly arranged at intervals along the central axis of the cyclone plate (35).

10. The casing split-flow urea mixing device according to claim 1, wherein the side of the guide plate (34) close to the swirl plate (35) is inclined downward, the rear clam shell end cover (1) is further provided with two through splitter boxes (11), the two splitter boxes (11) are symmetrically arranged, the splitter boxes (11) are located on the side of the guide plate (34) far away from the swirl plate (35), and the splitter boxes (11) are arranged corresponding to the guide plate (34).

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