Preceding-stage urea mixing device

By designing a cyclone part and a cyclone sheet in the pre-stage urea mixing device, the problem of poor mixing effect between urea and exhaust gas in the prior art is solved, and more efficient mixing of urea and exhaust gas is achieved, the working efficiency of the catalytic reducing device is improved, and the back pressure of the device is reduced.

CN222936819UActive Publication Date: 2025-06-03WUXI WEIFU LIDA CATALYTIC CONVERTER
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Patent Information

Application Number
CN202422139427.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-02
Publication Date
2025-06-03
Estimated Expiration
2034-09-02

AI Technical Summary

Technical Problem

In the prior art, the front-level urea jet assembly adopts a baffle structure design with holes, and the mixing effect of urea droplets and exhaust gas is poor, which affects the effect of subsequent selection of catalytic reducing device.

Method used

A pre-level urea mixing device is designed, including a tube body, a urea mount and a urea mixing assembly. The urea mixing assembly consists of a cyclone part, a connecting part and a cyclone hole. The cyclone part is conical, and the side wall is equipped with a cyclone hole and a cyclone sheet. The angle between the cyclone sheet and the side wall of the cyclone part is 35 to 45° to enhance the mixing effect of urea and exhaust gas.

Benefits of technology

Through the design of the cyclone part and the cyclone sheet, the mixing effect between urea and exhaust gas is significantly improved, the wall area of ​​urea droplets is increased, the crushing effect of urea is enhanced, the working efficiency of downstream selection of catalytic reducing device is improved, and the back pressure of the device is reduced, and urea crystallization is avoided.

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Abstract

The utility model provides a preceding-stage urea mixing device which comprises a pipe body, a urea mounting seat, a first-stage urea mixing device and a second-stage urea mixing device, one end of the pipe body is a gas inlet end, the other end of the pipe body is a gas outlet end, the urea mounting seat is arranged on the side wall of the pipe body, and the urea mounting seat is used for mounting a urea nozzle; the urea mixing assembly is arranged in the pipe body and comprises a rotational flow part and a connecting part, the rotational flow part is conical and protrudes towards the urea mounting base, rotational flow holes are formed in the side wall of the rotational flow part, and the bottom of the rotational flow part is connected with the inner wall of the pipe body through the connecting part. According to the embodiment of the utility model, the rotational flow piece in the rotational flow part can enhance the mutual mixing effect of tail gas and urea liquid drops and increase the wall-attached area of the urea liquid drops, the urea liquid drops are accelerated to rotate and mix, the urea crushing effect is enhanced, and the urea mixing assembly is simple and compact in structure, small in occupied space and high in practicability. And the device can be applied to various complex cavities with different structures, and is wide in application range.
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Description

Technical Field

[0001] The utility model belongs to the technical field of engine exhaust aftertreatment, and particularly relates to a pre-stage urea mixing device. Background Art

[0002] With the continuous improvement of national motor vehicle exhaust emission standards, the main engine manufacturers have put forward higher requirements for the aftertreatment manufacturers. Therefore, for the current related requirements, a post-treatment solution for double urea injection is proposed, which includes a pre-stage aftertreatment component, a post-stage aftertreatment component, a pre-stage urea injection component, and a post-stage urea injection component. In the prior art, the pre-stage urea injection component adopts a baffle structure with holes. In this structure, the mixing effect of urea droplets and exhaust gas is poor, which affects the effect of the subsequent selective catalytic reduction reactor. Therefore, it is necessary to improve the design of the pre-stage urea injection component. Summary of the Invention

[0003] To solve at least one technical problem in the prior art, an embodiment of the utility model provides a pre-stage urea mixing device with good mixing effect of urea and exhaust gas. To achieve the above technical purposes, the technical solution adopted in the embodiment of the utility model is as follows:

[0004] An embodiment of the utility model provides a pre-stage urea mixing device, including:

[0005] A pipe body, one end of the pipe body is an air inlet end, and the other end is an air outlet end.

[0006] A urea mounting seat is arranged on the side wall of the pipe body, and the urea mounting seat is used for mounting a urea nozzle.

[0007] A urea mixing component is arranged in the pipe body, and the urea mixing component includes:

[0008] A swirling part, the swirling part is conical and protrudes towards the urea mounting seat, and swirling holes are arranged on the side wall of the swirling part.

[0009] A connecting part connects the bottom of the swirling part and the inner wall of the pipe body.

[0010] Further, the pipe body includes:

[0011] A bending part, the bending part protrudes towards one side of the pipe body, and the urea mounting seat is arranged on the bending part.

[0012] A first straight part is arranged upstream of the bending part.

[0013] A second straight part is arranged downstream of the bending part. The first straight part, the bending part, and the second straight part are fixedly connected and communicated. The urea mixing component is arranged in the second straight part, and the swirling part protrudes towards the bending part.

[0014] Further, the curved portion is provided with an extension portion, the extension direction of the extension portion is the same as the extension direction of the second straight portion, one end of the extension portion away from the second straight portion is a plane portion, and the urea mounting seat is provided on the plane portion;

[0015] The swirl portion protrudes toward the planar portion.

[0016] Furthermore, the angle between the plane where the bottom of the swirl portion is located and the side wall of the swirl portion is 45-50°.

[0017] Furthermore, the swirl hole is trapezoidal, and the width of the swirl hole gradually increases from the top of the swirl portion to the bottom of the swirl portion.

[0018] Furthermore, a swirl sheet is provided on one side of any one of the swirl holes and on one side of the swirl portion close to the air outlet end.

[0019] Furthermore, an included angle between any of the swirl sheets and the side wall of the swirl portion is 35-45°.

[0020] Further, any of the swirl plates approaches the central axis of the second straight portion from the top close to the swirl portion to the bottom close to the swirl plate;

[0021] And / or, the bending radius of the swirl plate from the top close to the swirl portion to the bottom close to the swirl plate is 40 to 50 mm.

[0022] Furthermore, the connecting portion is provided with a plurality of through holes, any one of the through holes penetrates the connecting portion along the axial direction, and a plurality of the through holes are distributed at equal intervals along the circumference.

[0023] Furthermore, sixteen through holes are provided on the connecting portion, and the sixteen through holes are evenly spaced along the circumference, and any of the through holes is circular.

[0024] The beneficial effects brought by the technical solution provided by the embodiment of the utility model are:

[0025] (1) The urea mixing assembly in the embodiment of the utility model has a simple and compact structure and occupies a small space. It can be applied to a variety of complex cavities with different structures and has a wide range of applications.

[0026] (2) The swirl plates in the swirl section of the utility model can enhance the mutual mixing effect between the exhaust gas and the urea droplets and increase the wall impact area of ​​the urea droplets, accelerate the rotation and mixing of the urea droplets, enhance the urea crushing effect, and improve the working efficiency of the downstream selective catalytic reducer.

[0027] (3) In the embodiment of the present utility model, the through hole on the connecting part can reduce the back pressure of the pre-stage urea mixing device, and can also prevent urea from crystallizing on the inner wall of the mixing component or the pipe body. Description of the Drawings

[0028] Figure 1 It is a cross-sectional view of the pre-stage urea mixing device in the embodiment of the present utility model.

[0029] Figure 2 It is a top view of the urea mixing assembly in the embodiment of the present utility model.

[0030] Figure 3 It is a front view of the urea mixing assembly in the embodiment of the present utility model. Detailed Embodiment

[0031] In order to make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0032] In the description of the embodiment of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0033] In the description of the embodiment of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can also be the communication inside two elements. It can be a wireless connection or a wired connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0034] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0035] The embodiment of the present utility model provides a pre-stage urea mixing device, including:

[0036] A tube body 1, one end of the tube body 1 is an air inlet end 1a, and the other end is an air outlet end 1b.

[0037] A urea mounting seat 2 is provided on the side wall of the tube body 1, and the urea mounting seat 2 is used for mounting a urea nozzle.

[0038] A urea mixing assembly 3 is provided in the tube body 1, and the urea mixing assembly 3 includes:

[0039] A swirl portion 31, the swirl portion 31 is conical and protrudes toward the urea mounting seat 2, and swirl holes 31a are provided on the side wall of the swirl portion 31.

[0040] A connecting portion 32 connects the bottom of the swirl portion 31 to the inner wall of the tube body 1.

[0041] This application is mainly used upstream of the pre-stage selective catalytic reducer. In a specific embodiment, as Figure 1 、 Figure 2 shown, the upper end of the tube body 1 is the air inlet end 1a, the lower end is the air outlet end 1b, the urea mounting seat 2 is provided on the side wall of the tube body 1, and a urea nozzle is mounted on the urea mounting seat 2, so that urea can be injected into the tube body 1. The swirl portion 31 can cause the urea and the exhaust gas to swirl, thereby increasing the mixing effect of the urea and the exhaust gas. The urea mixing assembly 3 can make the urea and the exhaust gas mix evenly. The overall structure is compact and occupies a small space, and it can be applied to different types of cavities, with a wide application range.

[0042] This application does not limit the shape of the tube body 1. The tube body 1 can be linear or curved. In a specific embodiment, the tube body 1 includes:

[0043] A bending portion 11, the bending portion 11 protrudes toward one side of the tube body 1, and the urea mounting seat 2 is provided on the bending portion 11.

[0044] A first straight portion 12 is provided upstream of the bending portion 11.

[0045] A second straight portion 13 is provided downstream of the bending portion 11. The first straight portion 12, the bending portion 11, and the second straight portion 13 are fixedly connected and communicate with each other. The urea mixing assembly 3 is provided in the second straight portion 13, and the swirl portion 31 protrudes toward the bending portion 11.

[0046] As Figure 1As shown, the curved portion 11 protrudes toward the left side, and the exhaust gas enters the first straight portion 12 from the air inlet end 1a, collides with the inner wall of the curved portion 11, flows toward the second straight portion 13, and flows out of the tube body 1 through the air outlet end 1b. The urea mounting seat 2 is arranged on the left side wall of the curved portion 11, and the urea sprayed from the urea nozzle sprays urea toward the second straight portion 13. The urea in the curved portion 11 can be preliminarily mixed with the exhaust gas and enter the second straight portion 13 together with the exhaust gas, and then through the urea mixing component 3 in the second straight portion 13, the mixing of urea and exhaust gas is further promoted. The design is reasonable and the mixing effect of urea and exhaust gas is good.

[0047] Further, the curved portion 11 is provided with an extension portion 111, the extension direction of the extension portion 111 is the same as the extension direction of the second straight portion 13, the end of the extension portion 111 away from the second straight portion 13 is a plane portion 112, and the urea mounting seat 2 is provided on the plane portion 112;

[0048] The swirl portion 31 protrudes toward the plane portion 112. Figure 1 As shown, this structure can ensure that the urea nozzle on the urea mounting seat 2 sprays urea along the extension direction of the second straight portion 13 , ensures the mixing of urea and exhaust gas, and prevents urea from crystallizing on the inner wall of the tube body 1 .

[0049] The swirl portion 31 protrudes toward the plane portion 112. Furthermore, the angle between the plane where the bottom of the swirl portion 31 is located and the side wall of the swirl portion 31 is 45-50 degrees. At this angle, the swirl portion 31 can guide urea and exhaust gas.

[0050] The present application does not limit the specific configuration of the swirl hole 31 a. In a specific embodiment, the swirl hole 31 a is rectangular, and the rectangular swirl hole 31 a extends from the top of the swirl portion 31 to the bottom of the swirl portion 31 .

[0051] In another specific embodiment, Figure 3 As shown, the swirl hole 31 a is trapezoidal, and the width of the swirl hole 31 a gradually increases from the top of the swirl portion 31 to the bottom of the swirl portion 31 .

[0052] Furthermore, a swirl sheet 311 is provided on one side of any swirl hole 31 a and on one side of the swirl portion 31 close to the gas outlet end 1 b.

[0053] It can be understood that the structural design of the swirl hole 31a and the swirl plate 311 can enhance the breakup effect of urea droplets and enhance the swirl of urea and exhaust gas, so that the urea and exhaust gas are mixed more fully.

[0054] Furthermore, the included angle between any one of the swirl vanes 311 and the side wall of the swirl portion 31 is 35 to 45°, and the swirl effect of urea and the exhaust gas is the best within this angle range.

[0055] Furthermore, any one of the swirl vanes 311 approaches the central axis of the second straight portion 13 from near the top of the swirl portion 31 to near the bottom of the swirl vane 311;

[0056] And / or, the bending radius of the swirl vane 311 from near the top of the swirl portion 31 to near the bottom of the swirl vane 311 is 40 to 50 mm.

[0057] The swirl vane 311 under this structure can enhance the mutual mixing effect of the exhaust gas and the urea droplets and increase the wall contact area of the urea droplets, accelerating the rotational mixing of the urea droplets, enhancing the urea fragmentation effect, and thus improving the working efficiency of the downstream selective catalytic reduction device.

[0058] Furthermore, a plurality of through holes 32a are provided on the connecting portion 32, any one of the through holes 32a axially penetrates the connecting portion 32, and the plurality of through holes 32a are equidistantly distributed along the circumference.

[0059] It can be understood that when urea and the exhaust gas enter the second straight portion 13, most of them flow out through the swirl holes 31a on the swirl portion 31, with good mixing effect. A small part of the urea and the exhaust gas flows out through the through holes 32a. The through holes 32a can reduce the back pressure of the pre-stage urea mixing device and also prevent urea from crystallizing on the inner wall of the mixing component or the pipe body 1.

[0060] In the present application, the shape, size, quantity, and position of the through holes 32a are not limited and can be adjusted adaptively according to actual needs. In a specific embodiment, as Figure 2 shown, sixteen through holes 32a are provided on the connecting portion 32, the sixteen through holes 32a are equidistantly distributed along the circumference, and any one of the through holes 32a is circular.

[0061] In another specific embodiment, six through holes 32a are provided on the connecting portion 32, the six through holes 32a are equidistantly distributed along the circumference, and any one of the through holes 32a is square.

[0062] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the examples, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A front-stage urea mixing device, characterized in that: include: A tube body (1), wherein one end of the tube body (1) is an air inlet end (1a) and the other end is an air outlet end (1b), A urea mounting seat (2) is arranged on a side wall of the tube body (1), and the urea mounting seat (2) is used to mount a urea nozzle; A urea mixing component (3) is arranged in the tube body (1), and the urea mixing component (3) comprises: A swirl portion (31), the swirl portion (31) being conical and protruding toward the urea mounting seat (2), a swirl hole (31a) being provided on a side wall of the swirl portion (31), A connecting portion (32) connects the bottom of the swirl portion (31) and the inner wall of the tube body (1).

2. The front-stage urea mixing device according to claim 1, characterized in that: The tube body (1) comprises: A bent portion (11), the bent portion (11) protruding toward one side of the tube body (1), and the urea mounting seat (2) being arranged on the bent portion (11); The first straight portion (12) is provided upstream of the curved portion (11), The second straight portion (13) is arranged downstream of the curved portion (11); the first straight portion (12), the curved portion (11) and the second straight portion (13) are fixedly connected and communicated; the urea mixing assembly (3) is arranged in the second straight portion (13); and the swirl portion (31) protrudes toward the curved portion (11).

3. The front-stage urea mixing device according to claim 2, characterized in that: The curved portion (11) is provided with an extension portion (111), the extension direction of the extension portion (111) being the same as the extension direction of the second straight portion (13), the end of the extension portion (111) away from the second straight portion (13) being a plane portion (112), the plane portion (112) being provided with the urea mounting seat (2); The swirl portion (31) protrudes toward the plane portion (112).

4. The front-stage urea mixing device according to claim 1, characterized in that: The angle between the plane where the bottom of the swirl portion (31) is located and the side wall of the swirl portion (31) is 45-50 degrees.

5. The front-stage urea mixing device according to claim 1, characterized in that: The swirl hole (31a) is trapezoidal in shape, and the width of the swirl hole (31a) gradually increases from a top portion close to the swirl portion (31) to a bottom portion close to the swirl portion (31).

6. The front-stage urea mixing device according to claim 1, characterized in that: A swirl sheet (311) is provided on one side of any one of the swirl holes (31a) and on one side of the swirl portion (31) close to the gas outlet end (1b).

7. The front-stage urea mixing device according to claim 1, characterized in that: The included angle between any one of the swirl sheets (311) and the side wall of the swirl portion (31) is 35-45 degrees.

8. The front-stage urea mixing device according to claim 2, characterized in that: Any of the swirl sheets (311) approaches the central axis of the second straight portion (13) from a top portion close to the swirl portion (31) to a bottom portion close to the swirl sheet (311); And / or, the bending radius of the swirl sheet (311) from the top close to the swirl portion (31) to the bottom close to the swirl sheet (311) is 40 to 50 mm.

9. The front-stage urea mixing device according to claim 1, characterized in that: A plurality of through holes (32a) are provided on the connecting portion (32), any one of the through holes (32a) penetrates the connecting portion (32) along the axial direction, and the plurality of through holes (32a) are distributed at equal intervals along the circumference.

10. The front-stage urea mixing device according to claim 9, characterized in that: Sixteen through holes (32a) are provided on the connecting portion (32), the sixteen through holes (32a) are distributed at equal intervals along the circumference, and any one of the through holes (32a) is circular.