Urea mixing device for tight coupling type purifier of diesel engine

Abstract

The utility model provides a urea mixing device for a tight coupling type purifier of a diesel engine, which comprises a gas inlet pipe and a gas outlet pipe, and a sensor mounting seat and a catalyst are arranged on the gas inlet pipe and / or the gas outlet pipe; the mixing assembly comprises a shell, the shell comprises a gas inlet end and a gas outlet end, the gas inlet end is connected and communicated with the gas inlet pipe, and the gas outlet end is connected and communicated with the gas outlet pipe; the nozzle base is arranged on the side, close to the air inlet end, of the shell; the crushing plate is arranged in the shell, and a plurality of crushing holes are formed in the crushing plate; and the rotational flow plate is arranged in the shell and arranged on the side, away from the nozzle base, of the crushing plate, the rotational flow plate and the crushing plate are arranged in a spaced mode, and a plurality of rotational flow holes are formed in the rotational flow plate. According to the embodiment of the utility model, the crushing plate is adopted to crush urea liquid drops, and meanwhile, the rotational flow plate is adopted to enhance the rotational flow effect of airflow, so that the mixing effect of the airflow and urea is improved, and the risk of blockage of an SDPF catalyst is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of diesel engine exhaust post-processing, and in particular relates to a urea mixing device for a diesel engine tightly coupled purifier. Background Art

[0002] The SDPF currently used in close-coupled purifiers for light-duty diesel engines combines the functions of an SCR to convert harmful NOx gases with a DPF to capture solid particulates. The compact and short layout of close-coupled purifiers results in low NH3 uniformity within the SDPF system, as well as low airflow and soot distribution. This increases the risk of SDPF clogging and uneven regeneration. Summary of the invention

[0003] To solve at least one technical problem in the prior art, the present invention provides a urea mixing device for a close-coupled diesel engine purifier to improve the mixing effect of urea and gas. To achieve the above technical objectives, the present invention adopts the following technical solutions:

[0004] The present invention provides a urea mixing device for a close-coupled purifier of a diesel engine, comprising:

[0005] An air inlet pipe and an air outlet pipe, wherein the air inlet pipe and / or the air outlet pipe are provided with a sensor mounting seat and a catalyst;

[0006] Hybrid components, including:

[0007] a housing disposed between the air inlet pipe and the air outlet pipe, the housing including an air inlet end and an air outlet end, the air inlet end being connected and communicated with the air inlet pipe, and the air outlet end being connected and communicated with the air outlet pipe;

[0008] A nozzle base is provided on a side of the housing close to the air inlet end;

[0009] A crushing plate is provided in the shell, and a plurality of crushing holes are provided on the crushing plate;

[0010] The swirl plate is arranged in the shell and on the side of the crushing plate away from the nozzle base and is spaced apart from the crushing plate. The swirl plate is provided with a plurality of swirl holes.

[0011] Furthermore, the angle between the extending direction of the air inlet pipe and the extending direction of the air outlet pipe is an acute angle, and the housing of the mixing assembly includes:

[0012] a first shell, one end of the first shell being fixedly connected to the air inlet pipe and the other end of the first shell being fixedly connected to the air outlet pipe;

[0013] The second housing, one end of the second housing is fixedly connected to the intake pipe, the other end is fixedly connected to the exhaust pipe, the side of the second housing is fixedly connected to the side of the first housing, and the nozzle base is provided at one end of the second housing close to the intake pipe.

[0014] Further, the crushing plate is curved, and the center of the crushing plate protrudes towards the end away from the nozzle base.

[0015] Further, on the side of any one of the crushing holes and on the side of the crushing plate facing away from the nozzle base, crushing blades are provided;

[0016] The included angle between any one of the crushing blades and the crushing plate is 20 to 45°.

[0017] Further, a first central through hole is also provided in the middle of the crushing plate.

[0018] Further, the swirl plate is conical, and the taper of the swirl plate is 60 to 80°.

[0019] Further, on the side of any one of the swirl holes and on the side of the swirl plate facing away from the crushing plate, swirl blades are provided;

[0020] The included angle between any one of the swirl blades and the swirl plate is 20 to 45°.

[0021] Further, a second central through hole is also provided in the middle of the swirl plate.

[0022] Further, the catalyst includes:

[0023] DOC catalyst, provided in the intake pipe;

[0024] SDPF catalyst, provided in the exhaust pipe.

[0025] Further, the sensor mounting seat includes:

[0026] The first sensor mounting seat, which is used to mount the first temperature sensor;

[0027] The second sensor mounting seat, which is used to mount the nitrogen oxide sensor, and the first sensor mounting seat and / or the second sensor mounting seat are provided at one end of the intake pipe away from the mixing assembly;

[0028] The third sensor mounting seat, which is provided at one end of the first housing close to the exhaust pipe, and the third sensor mounting seat is used to mount the second temperature sensor.

[0029] The beneficial effects brought by the technical solution provided by the embodiment of the present invention are:

[0030] The structure of the embodiment of the present utility model is compact, and it can realize the crushing and mixing of urea in a narrow space, and guide the gas to be evenly mixed and then reach the SDPF catalyst. Specifically, a crushing plate is used to crush urea droplets, accelerate the dispersion of urea droplets, reduce the risk of urea crystallization, and initially drive the gas to swirl. A swirl plate is used to strengthen the swirling effect of the air flow, further increase the mixing distance between the gas and urea, improve the mixing effect of the gas and urea, thereby enhancing the uniformity of soot distribution and ammonia mixing, and reducing the risk of blockage of the SDPF catalyst. Description of the Drawings

[0031] Figure 1 It is a schematic structural diagram of a urea mixing device for a diesel engine close-coupled purifier in an embodiment of the present utility model.

[0032] Figure 2 It is a partial cross-sectional view of a urea mixing device for a diesel engine close-coupled purifier in an embodiment of the present utility model.

[0033] Figure 3 It is a schematic structural diagram of a crushing plate in an embodiment of the present utility model.

[0034] Figure 4 It is a schematic structural diagram of a swirl plate in an embodiment of the present utility model. Detailed Embodiments

[0035] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying 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.

[0036] In the description of the embodiments 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, and 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 should not be construed 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 construed as indicating or implying relative importance.

[0037] In the description of the embodiments of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" 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 a direct connection or an indirect connection through an intermediate medium, and it can also be the communication inside two components. 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.

[0038] 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.

[0039] The embodiments of the present utility model provide a urea mixing device for a diesel engine close-coupled purifier, including:

[0040] An intake pipe 1 and an outlet pipe 2, wherein a sensor mounting seat 3 and a catalyst 4 are provided on the intake pipe 1 and / or the outlet pipe 2;

[0041] A mixing assembly 5, including:

[0042] A housing 51, which is arranged between the intake pipe 1 and the outlet pipe 2. The housing 51 includes an air inlet end 51a and an air outlet end 51b. The air inlet end 51a is connected and communicated with the intake pipe 1, and the air outlet end 51b is connected and communicated with the outlet pipe 2;

[0043] A nozzle base 52, which is arranged on one side of the housing 51 close to the air inlet end 51a;

[0044] A breaking plate 53, which is arranged in the housing 51. A plurality of breaking holes 53a are provided on the breaking plate 53;

[0045] A swirl plate 54, which is arranged in the housing 51, on the side of the breaking plate 53 away from the nozzle base 52, and is arranged at an interval from the breaking plate 53. A plurality of swirl holes 54a are provided on the swirl plate 54.

[0046] In a specific embodiment, such as Figure 1 and Figure 2As shown, the intake pipe 1, the mixing component 5, and the outlet pipe 2 are fixedly connected and communicated in sequence. Gas enters the urea mixing device for a diesel engine close-coupled purifier from the intake pipe 1. A nozzle base 52 is provided on the upper side of the housing 51. A urea nozzle is installed on the nozzle base 52, and the urea nozzle sprays urea into the mixing component 5. The urea and the gas are mixed with each other and react. Since a crushing plate 53 and a swirl plate 54 are also provided in the housing 51, the crushing plate 53 disperses the urea to promote the mixing between the urea and the gas, and the swirl plate 54 swirls the urea and the gas, further enabling the urea and the gas to be fully mixed. Then, the air flow flows out of the urea mixing device for the diesel engine close-coupled purifier through the outlet pipe 2. The structure is simple. The mixing component 5 can improve the mixing effect of the air flow and the urea, thereby enhancing the soot distribution uniformity and ammonia mixing uniformity, effectively avoiding the risk of catalyst blockage in the outlet pipe 2, and improving the effect of purifying diesel engine exhaust gas.

[0047] In this application, the specific configuration of the housing 51 in the mixing component 5 is not limited, and the housing 51 is adaptively adjusted according to actual needs. In a specific embodiment, the included angle between the extending direction of the intake pipe 1 and the extending direction of the outlet pipe 2 is an acute angle. The housing 51 of the mixing component 5 includes:

[0048] A first housing 511, one end of the first housing 511 is fixedly connected to the intake pipe 1, and the other end is fixedly connected to the outlet pipe 2;

[0049] A second housing 512, one end of the second housing 512 is fixedly connected to the intake pipe 1, and the other end is fixedly connected to the outlet pipe 2. The side of the second housing 512 is fixedly connected to the side of the first housing 511. The nozzle base 52 is provided at one end of the second housing 512 close to the intake pipe 1.

[0050] Such as Figure 1 and Figure 2As shown, the angle between the extension direction of the intake pipe 1 and the extension direction of the outlet pipe 2 is acute. Therefore, it is understandable that the housing 51 is bent toward one side. Installing the nozzle base 52 on the second housing 512 helps extend the urea's travel path, thereby extending the mixing time of the urea and the gas, and improving the mixing effect of the urea and gas. Furthermore, the second housing 512 has a platform at one end near the intake pipe 1, on which the nozzle base 52 is installed. Installing the urea nozzle maximizes the extension of the urea's travel path. Furthermore, during actual use, urea is prone to crystallization on the inner wall of the second housing 512. By configuring the housing 51 as a first housing 511 and a second housing 512, it is easier to replace the second housing 512 later, facilitating maintenance.

[0051] Furthermore, the crushing plate 53 is a curved surface, and the center of the crushing plate 53 protrudes toward the end away from the nozzle base 52 .

[0052] like Figure 2 and Figure 3 As shown, the crushing plate 53 is set to a curved surface with the center bulging downward, which is conducive to gathering the gas entering from the intake pipe 1 in the central area of the crushing plate 53, so that the urea spray can be fully mixed with the gas in this area and crushed by the crushing plate 53.

[0053] Furthermore, a crushing blade 531 is provided on the side of any of the crushing holes 53a and on the side of the crushing plate 53 facing away from the nozzle base 52;

[0054] The included angle between any one of the crushing blades 531 and the crushing plate 53 is 20 to 45 degrees.

[0055] It can be understood that the crushing holes 53a on the crushing plate 53 can crush the urea droplets and promote the mixing between urea and gas. The number, position and shape of the crushing holes 53a are not limited and can be adjusted according to needs. In a specific embodiment, Figure 3 As shown, on the crushing plate 53, a plurality of crushing holes 53a are distributed at equal intervals around the circumference, and any of the crushing holes 53a is rectangular.

[0056] The crushing blades 531 can produce a preliminary swirl effect on urea and gas. The angle between the crushing blades 531 and the crushing plate 53 is not limited. When the angle is 20 to 45 degrees, the crushing effect of the crushing blades 531 is better.

[0057] Furthermore, a first central through hole 53 b is provided in the middle of the crushing plate 53 .

[0058] The first central through hole 53b is conducive to increasing a certain amount of airflow in the urea wall area, reducing the risk of urea crystallization, and preventing the central low airflow area caused by airflow rotation. The size and shape of the first central through hole 53b are not limited and can be adaptively adjusted according to actual needs. Figure 3 As shown, the first central through hole 53b may be circular.

[0059] Furthermore, the swirl plate 54 is conical, and the taper of the swirl plate 54 is 60-80°.

[0060] The swirl plate 54 adopts a conical structure, which is beneficial for gathering the mixed flow of urea and exhaust gas toward the center, avoiding the formation of a central low airflow area, and thus ensuring the uniformity of the overall airflow.

[0061] Furthermore, a swirl blade 541 is provided on the side of any of the swirl holes 54a and on the side of the swirl plate 54 facing away from the crushing plate 53;

[0062] The included angle between any of the swirl blades 541 and the swirl plate 54 is 20-45 degrees.

[0063] The swirl blades 541 can make the mixed air flow generate swirl, thereby increasing the mixing distance between urea and exhaust gas, improving the mixing effect of urea and exhaust gas, and improving the uniformity of ammonia mixing. The number, position, and shape of the swirl holes 54a are also not limited and can be adjusted according to needs. In a specific embodiment, Figure 4 As shown, on the swirl plate 54, a plurality of swirl holes 54a are evenly spaced around the circumference, and any of the swirl holes 54a is trapezoidal.

[0064] In the present application, the crushing blades 531 on the crushing plate 53 and / or the swirl blades 541 on the swirl plate 54 can be arranged in a counterclockwise direction or a clockwise direction, and the rotation direction of the crushing blades 531 and the rotation direction of the swirl blades 541 can be the same or different.

[0065] Furthermore, a second central through hole 54 b is provided in the middle of the swirl plate 54 .

[0066] The second central through hole 54b can also prevent a central low airflow area caused by airflow rotation.

[0067] The present application does not limit the specific types and levels of the catalyst in the inlet pipe 1 and the catalyst in the outlet pipe 2. In a specific embodiment, the catalyst 4 includes:

[0068] A DOC catalyst 41 is provided in the intake pipe 1;

[0069] The SDPF catalyst 42 is provided in the outlet pipe 2.

[0070] In other embodiments, a DPF (Diesel Particulate Filter), a TWC (Three-Way Catalyst), an SCR (Selective Catalytic Reduction Catalyst), etc. can also be used in the inlet pipe 1 and / or the outlet pipe 2, and a multi-stage catalyst can also be used, with a wide range of applications.

[0071] Further, the sensor mounting seat 3 includes:

[0072] A first sensor mounting seat 31 for mounting a first temperature sensor;

[0073] A second sensor mounting seat 32 for mounting a nitrogen oxide sensor. The first sensor mounting seat 31 and / or the second sensor mounting seat 32 are provided at an end of the inlet pipe 1 away from the mixing assembly 5;

[0074] A third sensor mounting seat 33 is provided at an end of the first housing 511 close to the outlet pipe 2, and the third sensor mounting seat 33 is used for mounting a second temperature sensor.

[0075] As Figure 1 shown, both the first temperature sensor and the second temperature sensor can detect the temperature of the gas. Among them, before the gas enters the inlet pipe 1 and is processed by the DOC catalyst 41 in the inlet pipe 1, the temperature can be detected by the first temperature sensor and the gas component content can be detected by the nitrogen oxide sensor. When the gas enters the outlet pipe 2 and before being processed by the SDPF catalyst 42 in the outlet pipe 2, the temperature can be detected by the second temperature sensor. The structure is simple and the design is reasonable.

[0076] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and are not intended 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 urea mixing device for a diesel engine close-coupled purifier, characterized in that, include: An air inlet pipe (1) and an air outlet pipe (2), wherein a sensor mounting seat (3) and a catalyst (4) are provided on the air inlet pipe (1) and / or the air outlet pipe (2); A mixing assembly (5) comprising: A housing (51) is provided between the air inlet pipe (1) and the air outlet pipe (2), the housing (51) comprising an air inlet end (51a) and an air outlet end (51b), the air inlet end (51a) being connected to and in communication with the air inlet pipe (1), and the air outlet end (51b) being connected to and in communication with the air outlet pipe (2); A nozzle base (52) is provided on a side of the housing (51) close to the air inlet end (51a); A crushing plate (53) is provided in the housing (51), and a plurality of crushing holes (53a) are provided on the crushing plate (53); A swirl plate (54) is provided in the housing (51) and on a side of the crushing plate (53) away from the nozzle base (52), and is spaced apart from the crushing plate (53). The swirl plate (54) is provided with a plurality of swirl holes (54a).

2. The urea mixing device for a close-coupled diesel engine purifier according to claim 1, characterized in that: The included angle between the extending direction of the air inlet pipe (1) and the extending direction of the air outlet pipe (2) is an acute angle, and the housing (51) of the mixing assembly (5) comprises: A first shell (511), one end of the first shell (511) being fixedly connected to the air inlet pipe (1) and the other end of the first shell (511) being fixedly connected to the air outlet pipe (2); A second shell (512), one end of the second shell (512) is fixedly connected to the air inlet pipe (1), and the other end is fixedly connected to the air outlet pipe (2), the side of the second shell (512) is fixedly connected to the side of the first shell (511), and the nozzle base (52) is provided at one end of the second shell (512) close to the air inlet pipe (1).

3. The urea mixing device for a close-coupled diesel engine purifier according to claim 1, wherein: The crushing plate (53) is a curved surface, and the center of the crushing plate (53) protrudes toward an end away from the nozzle base (52).

4. The urea mixing device for a close-coupled diesel engine purifier according to claim 1, wherein: A crushing blade (531) is provided on the side of any one of the crushing holes (53a) and on the side of the crushing plate (53) facing away from the nozzle base (52); The included angle between any one of the crushing blades (531) and the crushing plate (53) is 20 to 45 degrees.

5. The urea mixing device for a close-coupled diesel engine purifier according to claim 1, characterized in that: A first central through hole (53b) is also provided in the middle of the crushing plate (53).

6. The urea mixing device for a close-coupled diesel engine purifier according to claim 1, characterized in that: The swirl plate (54) is conical, and the taper of the swirl plate (54) is 60-80°.

7. The urea mixing device for a close-coupled diesel engine purifier according to claim 1, wherein: On the side of any one of the swirling holes (54a), and on the side of the swirling plate (54) facing away from the crushing plate (53), there are swirling vanes (541); The angle between any one of the swirling vanes (541) and the swirling plate (54) is 20 to 45°.

8. The urea mixing device for a diesel engine close-coupled purifier according to claim 1, wherein A second central through hole (54b) is further provided in the middle of the swirling plate (54).

9. The urea mixing device for a diesel engine close-coupled purifier according to claim 1, wherein The catalyst (4) includes: A DOC catalyst (41), provided in the intake pipe (1); An SDPF catalyst (42), provided in the exhaust pipe (2).

10. The urea mixing device for a diesel engine close-coupled purifier according to claim 2, wherein The sensor mounting seat (3) includes: A first sensor mounting seat (31), and the first sensor mounting seat (31) is used for mounting a first temperature sensor; A second sensor mounting seat (32), and the second sensor mounting seat (32) is used for mounting a nitrogen oxide sensor. The first sensor mounting seat (31) and / or the second sensor mounting seat (32) is provided at one end of the intake pipe (1) facing away from the mixing assembly (5); A third sensor mounting seat (33), and the third sensor mounting seat (33) is provided at one end of the first housing (511) close to the exhaust pipe (2). The third sensor mounting seat (33) is used for mounting a second temperature sensor.

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