CN113775395A

CN113775395A - Font mixing arrangement and aftertreatment system return

Info

Publication number: CN113775395A
Application number: CN202111211414.5A
Authority: CN
Inventors: 何伟娇; 陈正国; 陈增响; 张旭; 付细平; 徐东; 陆超俊
Original assignee: Wuxi Weifu Lida Catalytic Converter Co Ltd
Current assignee: Wuxi Weifu Lida Catalytic Converter Co Ltd
Priority date: 2021-10-18
Filing date: 2021-10-18
Publication date: 2021-12-10
Anticipated expiration: 2041-10-18
Also published as: CN113775395B; WO2023065383A1

Abstract

The application discloses a Chinese character 'hui' shaped mixing device, which comprises a shell, a fixed plate, an air inlet guide plate and an air outlet guide plate, wherein the fixed plate is used for sealing the shell and is provided with an air inlet and an air outlet; the air inlet guide plate and the air outlet guide plate are arranged in the shell and form a guide ring; the gas enters the shell through the gas inlet, winds through the flow guide ring and is discharged from the gas outlet; the flow guide ring enables the inner space of the shell to form a U-shaped mixing channel, the flowing distance of gas is prolonged on the basis that the space is not increased, and the moving direction of the gas can be changed to promote the gas to swirl and promote the mixing of the gas and the urea solution. The application also discloses an aftertreatment system, including above-mentioned back font mixing arrangement, still include the baffle, first barrel of baffle intercommunication, mixing arrangement and second barrel, simple structure, occupation space are little and the effectual of tail gas purification.

Description

Font mixing arrangement and aftertreatment system return

Technical Field

The application relates to the technical field of automobile exhaust treatment equipment, in particular to a square-shaped mixing device and an aftertreatment system.

Background

The automobile exhaust contains harmful gases such as CO (carbon monoxide), HC (hydrocarbon) and NOx (nitrogen oxide), and the automobile exhaust needs to be purified to protect the environment and human bodies.

Selective Catalytic Reduction (SCR) is a treatment process for NOx in automobile exhaust. Specifically, after entering the SCR device, the tail gas is sprayed with reducing agent ammonia or urea, and NOx is reduced into nitrogen and oxygen under the action of a catalyst.

In conventional SCR equipment, for guaranteeing the mixed effect of urea solution and tail gas, the mixed space of tail gas and urea is longer, and the design like this needs great installation space on the one hand, and on the other hand has increased the risk of urea crystallization.

Particularly, in an exhaust gas treatment system for a heavy-duty commercial vehicle, a catalyst carrier having a large size needs to be installed to satisfy a purification effect, but an installation space for installing the treatment system in the vehicle is limited, and thus there is a contradiction that a urea mixing distance is increased in order to enhance a mixing effect.

Disclosure of Invention

The application aims to overcome the defects in the prior art and provide a Chinese character hui-shaped mixing device and a post-processing system.

In order to achieve the above technical object, the present application provides a character-hui mixing device, including: a housing, one end of which is open; the fixing plate is arranged at the opening and is provided with an air inlet and an air outlet; the air inlet guide plate is arranged in the shell and is arranged between the air inlet and the air outlet; the air outlet guide plate is arranged in the shell and is connected with the air inlet guide plate; the air inlet guide plate and the air outlet guide plate form a guide ring, one side of the guide ring is connected with the fixed plate, two ends of the guide ring are connected with the shell, the side wall of the guide ring is arranged at intervals with the shell, and a mixing channel is formed at intervals; the square-shaped mixing device also comprises a urea nozzle for spraying urea to the mixing channel; the gas enters the mixing channel via the gas inlet and can be mixed with urea in the mixing channel.

Further, the intake baffle includes: the first air inlet section is arranged at the opening, extends obliquely towards the direction far away from the air outlet from one end of the first air inlet section close to the fixed plate and one end of the first air inlet section far away from the fixed plate, so that a mixing channel formed between the first air inlet section and the shell is gradually reduced; the second section of admitting air, the one end of second section of admitting air is connected first section of admitting air, and the guide plate of giving vent to anger is connected to the other end, and the second section of admitting air extends the setting horizontally.

Further, the air outlet guide plate comprises: the first air outlet section is arranged at the opening, extends towards the air inlet in an inclined manner from one end of the first air outlet section far away from the fixed plate to one end of the first air outlet section close to the fixed plate, so that a mixing channel formed between the first air outlet section and the shell is gradually enlarged; the second section of giving vent to anger, the one end of the second section of giving vent to anger is connected the first section of giving vent to anger, and the guide plate that admits air is connected to the other end, and the second section of giving vent to anger extends the setting horizontally.

Further, the one end that the guide plate of admitting air kept away from the export links to each other with the guide plate of giving vent to anger through arc guide plate.

Furthermore, the square-shaped mixing device also comprises a connecting plate, and the flow guide ring is connected with the fixing plate through the connecting plate; one side of the connecting plate is hermetically connected with the fixed plate, and the other side of the connecting plate is hermetically connected with the flow guide ring; the two ends of the connecting plate are hermetically connected with the shell.

Further, the air inlet is circular; and/or the air outlet is a special-shaped quadrangle.

Furthermore, the urea nozzle is arranged on the fixed plate, and the urea nozzle and the air inlet guide plate are oppositely arranged on two sides of the air inlet.

The application also provides an after-treatment system, including above-mentioned back font mixing arrangement, still include the baffle, seted up on the baffle: the main air inlet is connected with the first cylinder; the fixing plate is arranged on the partition plate, the air inlet is connected with the auxiliary air inlet, and the air outlet is connected with the auxiliary air outlet; the main air outlet is connected with the second cylinder; the gas enters the auxiliary gas inlet after passing through the main gas inlet through the first cylinder, then enters the mixing channel through the gas inlet to be mixed with urea, and the mixed gas passes through the gas outlet, the auxiliary gas outlet, the main gas outlet and finally is discharged through the second cylinder.

Further, the post-processing system further comprises: the first end cover is communicated with the main air inlet and the auxiliary air inlet; and the second end cover is communicated with the auxiliary air outlet and the main air outlet.

Further, the first end cover comprises a connecting part and a cover part, the cover part is connected with the connecting part in a sealing mode, and a first flow-through space is formed between the cover part and the connecting part; the connecting part is provided with an air inlet perforation and an air outlet perforation, and air enters the first flow-through space through the air inlet perforation and can flow out through the air outlet perforation; and/or the second end cover comprises a first cover body and a second cover body, the first cover body is connected with the partition plate, the second cover body is arranged in the first cover body, and a gap is formed between the second cover body and the first cover body.

The application provides a Chinese character hui-shaped mixing device which comprises a shell, a fixed plate, an air inlet guide plate and an air outlet guide plate, wherein the fixed plate is used for sealing the shell and is provided with an air inlet and an air outlet; the air inlet guide plate and the air outlet guide plate are arranged in the shell and form a guide ring; the gas enters the shell through the gas inlet, winds through the flow guide ring and is discharged from the gas outlet; the flow guide ring enables the inner space of the shell to form a U-shaped mixing channel, the flowing distance of gas is prolonged on the basis that the space is not increased, and the moving direction of the gas can be changed to promote the gas to swirl and promote the mixing of the gas and the urea solution.

The application also provides an aftertreatment system, including above-mentioned back font mixing arrangement, still include the baffle, first barrel of baffle intercommunication, mixing arrangement and second barrel, simple structure, occupation space are little and the effectual of tail gas purification.

Drawings

Fig. 1 is a schematic structural diagram of a homocentric square-shaped mixing device provided by the present application;

FIG. 2 is a schematic perspective view of the homocentric square-shaped mixing device shown in FIG. 1 in another direction;

FIG. 3 is an exploded view of the structure of the homocentric square-shaped mixing device shown in FIG. 1;

fig. 4 is a schematic structural view of a guide ring in the mixing device shown in fig. 1;

FIG. 5 is a schematic structural view of a fixing plate of the mixing device shown in FIG. 1;

FIG. 6 is a schematic structural diagram of an aftertreatment system provided herein;

FIG. 7 is an exploded view of the structure of the aftertreatment system of FIG. 6;

FIG. 8 is an exploded view of the first end cap of the aftertreatment system of FIG. 6;

FIG. 9 is a cross-sectional view of the aftertreatment system of FIG. 6 with respect to the first endcap;

FIG. 10 is an enlarged view of the circled structure of FIG. 9;

FIG. 11 is a cross-sectional view of the aftertreatment system of FIG. 6 with a second endcap.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The application provides a return font mixing arrangement includes: a housing 10, one end of the housing 10 being open; the fixing plate 20 is arranged at the opening, and an air inlet 21 and an air outlet 22 are arranged on the fixing plate 20; an intake baffle 30 disposed in the housing 10 and between the air inlet 21 and the air outlet 22; and the air outlet guide plate 40 is arranged in the shell 10 and is connected with the air inlet guide plate 30.

Referring specifically to fig. 1 and 2, in the illustrated embodiment, the housing 10 is open at the front left end, and the fixing plate 20 is disposed in front of the housing 10 and is capable of sealing the opening such that gas can only enter the housing 10 through the gas inlet 21 and exit the housing 10 through the gas outlet 22.

To facilitate the molding of the housing 10, the housing 10 optionally includes an upper cavity half 11 and a lower cavity half 12, and referring to fig. 3 in particular, the upper cavity half 11 and the lower cavity half 12 are hermetically connected to form a hollow cavity with an open end. The split type shell 10 is arranged, so that the processing and the material saving can be facilitated, and the installation of the air inlet guide plate 30 and the air outlet guide plate 40 can be facilitated.

Optionally, the corners of the housing 10 are rounded to avoid the presence of sharp corners creating a safety hazard.

Optionally, the shell bottom of the shell 10 away from the opening is an arc bottom, so that sharp corners can be avoided, and the circulation space inside the shell 10 can be enlarged.

To facilitate attachment of the stationary plate 20 to the housing 10, the stationary plate 20 optionally includes a plate surface 20a and a cover surface 20b, the air inlet 21 and the air outlet 22 being disposed through the plate surface 20a, and the cover surface 20b being disposed on a side of the plate surface 20a adjacent to the housing 10 and around an outer periphery of the plate surface 20 a. During the installation, the open end of casing 10 can stretch into in the top facing 20b and support and lean on face 20a for the inner wall of top facing 20b and the surface chucking of casing 10, perhaps, make the inner wall of top facing 20b and the surface sealing connection of casing 10, be favorable to guaranteeing mixing arrangement's structural stability, and avoid gas leakage.

Wherein, the air inlet guide plate 30 and the air outlet guide plate 40 form a guide ring, one side of the guide ring is connected with the fixing plate 20, two ends of the guide ring are connected with the shell 10, the side wall of the guide ring is arranged at intervals with the shell 10, and the intervals form a mixing channel.

With continued reference to fig. 1-3, in the illustrated embodiment, the first direction is a length direction of the housing 10 (i.e., a direction in which the open end of the housing 10 points to the bottom of the housing 10), and the second direction is a thickness direction of the housing 10. At this time, the flow guide ring is hermetically connected with the fixing plate 20 along the first direction and on the side close to the fixing plate 20; the deflector ring is spaced apart from the bottom of the housing 10 along a first direction on a side away from the fixing plate 20. Both sides of the deflector ring along the second direction are hermetically connected with the housing 10. Thus, after entering the housing via the inlet 21, the gas can only flow along the mixing channel towards the outlet 22.

Optionally, the deflector ring is welded to the mounting plate 20 and/or the housing 10.

Optionally, a sealing member (e.g., a sealing ring or a sealing gasket made of a flexible material such as rubber or plastic) is disposed between the guide ring and the fixing plate 20 and/or between the guide ring and the housing 10.

Optionally, the deflector ring is disposed in the housing 10 in an interference manner, and/or the deflector ring is connected to the fixing plate 20 in an interference manner.

The application is not limited to the manner of sealing the connection.

Furthermore, the square-shaped mixing device also comprises a urea nozzle 1 for spraying urea to the mixing channel; the gas enters the mixing channel via the gas inlet 21 and can be mixed with urea in the mixing channel.

One end of the urea nozzle 1 is connected to an external urea supply device (not shown), and the other end of the urea nozzle extends into the housing 10 and faces the mixing passage. During operation, the urea solution that urea feeding mechanism exported can spout into the mixing channel through urea nozzle 1.

In one embodiment, the urea nozzle 1 is provided on the fixed plate 20. In order to ensure the mixing distance of the gas and the urea and improve the utilization rate of a mixing channel, the urea nozzle 1 is arranged on one side of the gas inlet 21; thus, the urea solution is entrained by the gas entering the housing 10, and both pass through the mixing channel.

Alternatively, the urea nozzle 1 is disposed on both sides of the intake port 21 opposite to the intake baffle 30. Referring specifically to fig. 1 and 2, in the illustrated embodiment, the urea nozzle 1, the air inlet 21, the deflector ring, and the air outlet 22 are arranged in sequence. Because urea nozzle 1 locates the import side of gaseous, consequently, gaseous and urea solution can the quick contact, simultaneously, because the flow direction of gaseous is close with urea nozzle 1 injection direction, more is favorable to the mixture of the two. In addition, because the air inlet 21 is arranged between the urea nozzle 1 and the air inlet guide plate 30, the distance between the urea nozzle 1 and the air inlet guide plate 30 is large, and the gas input through the air inlet 21 flows towards the shell and has a certain flow and flow velocity, so that the urea solution sprayed out of the urea nozzle 1 is not easy to splash onto the air inlet guide plate 30, and the risk of urea crystallization on the air inlet guide plate 30 is reduced.

Alternatively, in this embodiment, the urea nozzle 1 is disposed near a position where the stationary plate 20 is connected to the housing 10 (i.e., a side of the intake port 21 away from the intake baffle 30). Thus, the installation position of the urea nozzle 1 is far from the air intake baffle 30, and the risk of urea crystallization on the air intake baffle 30 can be further reduced.

Alternatively, in this embodiment, the injection direction of the urea injection nozzle 1 is inclined toward the intake baffle 30. Specifically, the injection direction of the urea nozzle 1 intersects the first direction, and the urea solution injected from the urea nozzle 1 moves toward the bottom of the casing and also moves toward the intake air guide plate 30. With such an arrangement, on one hand, the urea solution can be prevented from splashing on the inner wall of the shell 10 opposite to the air inlet guide plate 30, so that the risk of urea crystallization on the shell 10 is reduced; on the other hand, the urea solution can impact the gas flow, so that the urea solution and the gas are favorably mixed; in addition, when the gas leaves the air inlet guide plate 30 and enters the air outlet guide plate 40, the gas can be reversed along the guide ring, and the urea solution sprayed obliquely is favorable for reversing.

In other embodiments, the urea nozzle 1 may also be arranged on the housing 10, even on the intake baffle 30. The present application does not limit the installation position and installation manner of the urea nozzle 1.

In summary, by providing the inlet guide plate 30 and the outlet guide plate 40 and forming the guide ring, a U-shaped mixing channel can be formed in the housing 10. It can be seen that when the length of the inner space of the housing 10 in the first direction is a, the mixing channel is configured to have a U-like shape, such that the total length of the mixing channel is not less than 2 a. That is to say, the design of baffle ring can be on the basis of not increasing the space, and gaseous circulation distance can be prolonged to the high efficiency. Meanwhile, in the process that the gas flows towards the gas outlet guide plate 40 through the gas inlet guide plate 30, the movement direction of the gas is changed, the gas turns backwards, a rotational flow can be formed, the rotational flow can stimulate urea particles to be broken, and the mixing of the gas and the urea solution is facilitated.

For better diversion of the intake air, in one embodiment, the intake baffle 30 comprises: the first air inlet section 31 is arranged at the opening, and extends obliquely from one end of the first air inlet section 31 close to the fixed plate 20 to one end of the first air inlet section 31 far away from the fixed plate 20, and the first air inlet section 31 extends towards the direction far away from the air outlet 22, so that a mixing channel formed between the first air inlet section 31 and the shell 10 is gradually reduced; the second section 32 of admitting air, the first section 31 of admitting air is connected to the one end of second section 32 of admitting air, the other end is connected the guide plate 40 of giving vent to anger, and second section 32 of admitting air extends the setting straightly.

Referring to fig. 4, the first air intake section 31 is disposed obliquely downward from left to right, and the second air intake section 32 is disposed to extend in the left-right direction.

With combined reference to fig. 2 and 4, an inlet section flow passage is formed between the first air inlet section 31 and the housing 10, the inlet section passage is tapered, and under the condition that the flow rate of the gas is not changed, the flow area is reduced, and the flow velocity of the gas is increased. That is, after the gas enters the inlet section, the gas starts to accelerate, the accelerated gas can better contact the urea solution and carry the urea solution to flow downstream, and meanwhile, the accelerated gas is beneficial to reversing.

The space inside the housing 10 is limited, and the first air intake section 31 cannot be extended infinitely; meanwhile, in order to ensure the stability of the mixing device, the mixing channel at the inlet section cannot be infinitely reduced; thus, the second air intake section 32 is provided. A advection section flow passage is formed between the second air inlet section 32 and the shell 10, and since the second air inlet section 32 extends horizontally, the flow area of the advection section is basically unchanged (it should be noted that the shell bottom of the shell 10 of the mixing device shown in the drawing is contracted, and since the second air inlet section 32 is close to the shell bottom, the passage of the advection section is also reduced, but the degree of the advection section is reduced slightly), and after the gas is accelerated into the advection section, the gas can flow downstream smoothly, so as to ensure the mixing time of the gas and the urea solution.

Optionally, the first air intake section 31 is connected with the second air intake section 32 in a circular arc.

Referring specifically to fig. 4, in the illustrated embodiment, a first arc segment 33 is disposed between the first air intake segment 31 and the second air intake segment 32. The first arc segment 33 is designed to smooth the deviation between the first air intake segment 31 and the second air intake segment 32 so as to guide the gas through the inlet segment into the advection segment. Meanwhile, the connection positions of the first arc section 33 and the first air inlet section 31 and the connection positions of the first arc section 33 and the second air inlet section 32 are not provided with convex or concave folding angles, so that the urea solution can be prevented from being accumulated in corners to form crystals.

In order to better guide the flow of the outlet air, in an embodiment, the outlet air guide plate 40 includes: the first air outlet section 41 is arranged at the opening, and extends obliquely towards the air inlet 21 from one end of the first air outlet section 41 far away from the fixing plate 20 to one end of the first air outlet section 41 close to the fixing plate 20, so that a mixing channel formed between the first air outlet section 41 and the shell 10 is gradually increased; and one end of the second air outlet section 42 is connected with the first air outlet section 41, the other end of the second air outlet section 42 is connected with the air inlet guide plate 30, and the second air outlet section 42 extends linearly.

Specifically, referring to fig. 4, the first air outlet section 41 is disposed obliquely from right to left, and the second air outlet section 42 is disposed to extend in the left-right direction.

With reference to fig. 2 and 4, an outlet section flow channel is formed between the first gas outlet section 41 and the housing 10, and the outlet section gradually expands toward the gas outlet 22, so that the flow velocity of the gas is reduced under the condition that the gas flow is not changed. That is to say, gaseous entering outlet section back can be the deceleration gradually, so, can reduce the gaseous pressure that acts on casing 10, air guide plate 40 and fixed plate 20 of giving vent to anger, can also prolong the mixing time of gaseous and urea solution to in order to guarantee mixing arrangement's structural stability, and improve gaseous and urea solution mixing effect.

Similar to the second gas inlet section 32 mentioned above, a advection section flow channel is also formed between the second gas outlet section 42 and the housing 10 (for the sake of convenience of distinction, the advection section formed between the second gas inlet section 32 and the housing 10 is referred to as an inlet advection section, and the advection section formed between the second gas outlet section 42 and the housing 10 is referred to as an outlet advection section), the flow area of the outlet advection section is substantially unchanged, and after the gas is reversed to enter the outlet advection section, the gas can smoothly flow to the gas outlet 22, so as to ensure the mixing time of the gas and the urea solution.

Optionally, the first gas outlet section 41 is connected with the second gas outlet section 42 in an arc shape.

Referring specifically to fig. 3, in the illustrated embodiment, a second arc segment 43 is disposed between first gas exit segment 41 and second gas exit segment 42. The second arc section 43 is similar to the first arc section 33 described above, and can be connected with the first air outlet section 41 and the second air outlet section 42 in a curve manner, so that the potential safety hazard caused by the existence of a broken angle or the accumulation and crystallization of urea are avoided.

Optionally, the end of the inlet baffle 30 away from the opening is connected to the outlet baffle 40 via an arc-shaped baffle 2.

Compared with the mode that the air inlet guide plate 30 is directly connected with the air outlet guide plate 40, the arc-shaped guide plate 2 is arranged, so that on one hand, the length of a flow channel at a turning section can be prolonged, and the rotational flow strength is ensured; on the other hand, the connection positions of the arc-shaped guide plate 2 and the air inlet guide plate 30 and the connection positions of the arc-shaped guide plate 2 and the air outlet guide plate 40 are all similar to planes and have no convex or concave folding angles, so that the normal circulation of gas and urea solution can be ensured, the gas-liquid mixing is facilitated, and the formation of crystals in corners caused by the accumulation of the urea solution can be avoided.

Optionally, the arc-shaped baffle 2 is a semicircular plate. At this time, the central angle of the arc-shaped guide plate 2 is 180 °. After passing through a turning section formed by the arc-shaped guide plate 2 and the shell 10, the flowing direction of the gas is turned; for example, in the embodiment shown in fig. 4, the gas flows from left to right as it flows through the intake baffle 30; when the gas flows through the arc-shaped guide plate 2, the gas flows anticlockwise; the gas flows from right to left when passing through the gas outlet guide plate 40. It can be known that the semicircular plate is beneficial to 180-degree gas reversing.

To connect the deflector ring to the mounting plate 20, in one embodiment, the deflector ring is directly connected to the mounting plate 20.

For example, one end of the inlet guide plate 30 close to the fixed plate 20 and one end of the outlet guide plate 40 close to the fixed plate 20 are respectively connected with the fixed plate 20 between the inlet port 21 and the outlet port 22 in a sealing manner.

For another example, one end of the inlet guide plate 30 close to the fixing plate 20 is connected to one end of the outlet guide plate 40 close to the fixing plate 20 (wherein, the inlet guide plate 30 and the outlet guide plate 40 may be directly connected, or may be connected through a third arc segment 44, and the third arc segment 44 is similar to the first arc segment 33 or the second arc segment 43 described above, and details are not repeated), and at this time, the guide ring is an independent closed ring structure, and the fixing plate 20 may be connected to any side surface of the guide ring in a sealing manner.

In another embodiment, the square-shaped mixing device provided by the present application further includes a connecting plate 3, and the guide ring is connected to the fixing plate 20 through the connecting plate 3; one side of the connecting plate 3 is hermetically connected with the fixing plate 20, and the other side is hermetically connected with the flow guide ring; the two ends of the connecting plate 3 are hermetically connected with the shell 10.

In this embodiment, the inlet baffle 30 and the outlet baffle 40 may be respectively connected to the connection board 3 in a sealing manner, or may form an independent closed ring and then be connected to the connection board 3 in a sealing manner.

Referring to fig. 1 and 2, in the illustrated embodiment, two sides of the connecting plate 3 along the first direction are hermetically connected with the fixing plate 20 and the deflector ring, and two sides of the connecting plate 3 along the second direction are hermetically connected with the upper top and the lower bottom of the housing 10.

Optionally, with combined reference to fig. 2, 3 and 5, the fixing plate 20 is provided with an insertion hole 23, and one side of the connecting plate 3 close to the fixing plate 20 is provided with an insertion block 3 a; when the connecting plate 3 is mounted, the insertion block 3a is inserted into the insertion hole 23, so that the connecting plate 3 can be mounted simply and accurately.

In order to avoid the gas leakage in the housing 10 caused by the gap after the insert block 3a is inserted into the insertion hole 23, a sealing member may be disposed between the insertion hole 23 and the insert block 3a, and the insert block 3a and the insertion hole 23 may be sealed by welding; it is also possible to have the socket 23 interference fit with the insert 3 a.

Similarly, for connecting the guide ring and the connecting plate 3 conveniently, the corresponding insert block can be arranged on the guide ring and the connecting plate 3, and the details are not repeated.

Optionally, one end of the inlet guide plate 30 close to the fixed plate 20 is connected to one end of the outlet guide plate 40 close to the fixed plate 20, and the connection angle between the inlet guide plate and the outlet guide plate is α, where α is greater than or equal to 40 ° and less than or equal to 45 °, so as to ensure that the aperture of the inlet section and the outlet section of the mixing channel meets the circulation requirement of the exhaust flow.

Alternatively, the air inlet 21 is circular.

Alternatively, the air outlet 22 is a contoured quadrilateral.

It should be explained that the shapes of the air inlet 21 and the air outlet 22 do not have an absolute correspondence. The air inlet 21 is provided in a circular shape because conventional air flow ducts are all circular tubes; in a limited space, the area of the circle is the largest; the air flow pipeline is a round pipe, so that the space can be fully utilized, and the air flow pipeline is favorable for large-flow air flow.

The air outlet 22 is formed in a trapezoidal shape in order to increase the size of the air outlet 22 as much as possible on the fixed plate 20 having a limited surface area, thereby reducing the back pressure on the fixed plate 20 and ensuring the structural stability of the mixing device. Meanwhile, unlike the circular opening, the extension length of the special-shaped quadrilateral opening in each direction is not limited to each other, for example, in the embodiment shown in fig. 5, the length of the gas outlet 22 in the up-down direction is larger, which is beneficial to the gas flowing in a larger range, facilitating the gas to fill the outflow space, and facilitating the gas to uniformly enter the outflow channels (detailed below).

The application also provides an after-treatment system, including above-mentioned back font mixing arrangement, still include baffle 50, seted up on the baffle 50: a main inlet 51 connected to the first cylinder 4; an auxiliary air inlet 52 and an auxiliary air outlet 53, wherein the fixing plate 20 is arranged on the partition plate 50, the air inlet 21 is connected with the auxiliary air inlet 52, and the air outlet 22 is connected with the auxiliary air outlet 53; and a general air outlet 54 connected with the second cylinder 5.

It should be explained that the first cylinder 4 is an air inlet duct of the aftertreatment system provided by the present application; one end of the first cylinder 4 communicates with an exhaust system (not shown) of the vehicle, and the other end communicates with the intake port 51. The second cylinder 5 is an air outlet pipeline of the aftertreatment system provided by the application, and one end of the second cylinder 5 is communicated with the main air outlet 54, and the other end is communicated with an exhaust pipe (not shown).

In the running process of the automobile, tail gas is generated; the tail gas enters the post-treatment system through the first cylinder 4; after passing through the main air inlet 51, the exhaust enters the auxiliary air inlet 52; since the auxiliary intake port 52 is connected to the intake port 21, exhaust gas can enter the mixing device via the intake port 21; the tail gas is mixed with urea in the mixing channel and then enters the gas outlet 22; since the air outlet 22 is connected to the auxiliary air outlet 53, the mixed air can enter the main air outlet 54 through the auxiliary air outlet 53 and finally be discharged through the second cylinder 5.

Optionally, a DOC-DPF unit (not shown) is provided within the first cylinder 4. Specifically, a DOC (diesel oxidation catalyst) carrier and a DPF (diesel particulate filter) carrier are sequentially disposed in the first cylinder 4. After the tail gas enters the first cylinder 4, the DOC carrier can convert CO and HC in the tail gas into harmless CO₂(carbon dioxide) and H₂O (water) and converting NO to NO₂(nitrogen dioxide). The DPF carrier is arranged at the downstream of the DOC carrier and can capture particles in the exhaust gas, so that the particles in the exhaust gas are reduced.

Optionally, an SCR unit (not shown) is provided in the second cylinder 5. Specifically, an SCR (selective catalytic reduction) carrier is provided in the second cylinder 5. After the tail gas mixed with the urea solution enters the SCR carrier, the SCR carrier is used as a catalyst and can catalyze the tail gas to react with urea, so that NOx in the tail gas is reduced into N₂(Nitrogen) and H₂O。

Optionally, the aftertreatment system provided herein comprises two second cylinders 5. When the exhaust gas displacement is large, for example, the aftertreatment system provided by the application is applied to a heavy commercial vehicle, the two second cylinders 5 can effectively adapt to the displacement.

It should be explained that the SCR carrier is typically a standard component available from outsourcing, having a predetermined size. The SCR carrier needs to be hermetically disposed in the second cylinder 5, and the gas flowing into the second cylinder 5 needs to pass through the SCR carrier, complete the catalytic reaction, and then be discharged. Therefore, the flow area in the second cylinder 5 is limited by the size of the SCR carrier, that is, when the exhaust emission is large, the volume of the second cylinder 5 cannot be directly increased. Therefore, the number of the second cylinders 5 is increased to meet the requirements of exhaust gas purification and emission.

Referring specifically to fig. 6 and 7, the partition 50 is provided with two general air outlets 54, and each general air outlet 54 is connected to one second cylinder 5. The two second cylinders 5 are arranged side by side, and the gas discharged through the mixing device can uniformly enter the two second cylinders 5.

Optionally, the fixing plate 20 includes a plate surface 20a and a connecting surface 20c, the air inlet 21 and the air outlet 22 are disposed on the plate surface 20a, and the connecting surface 20c is disposed on a side of the plate surface 20a facing away from the housing 10 and is used for extending the air inlet 21 and/or the air outlet 22.

For example, referring to fig. 1 and 7, the fixing plate 20 is provided with two connecting surfaces 20c, wherein one connecting surface 20c is used for connecting the air inlet 21, and the other connecting surface 20c is used for connecting the air outlet 22. When the fixed plate 20 and the partition plate 50 are mounted, the connection surface 20c connected to the air inlet 21 is inserted into the auxiliary air inlet 52, and the connection surface 20c connected to the air outlet 22 is inserted into the auxiliary air outlet 53.

The connecting surface 20c is arranged, so that the fixing plate 20 and the partition plate 50 can be conveniently calibrated and installed, and the contact area of the fixing plate 20 and the partition plate 50 can be increased, thereby being beneficial to the sealing connection of the fixing plate 20 and the partition plate 50.

To achieve communication between the main air inlet 51 and the auxiliary air inlet 52, and communication between the main air outlet 54 and the auxiliary air outlet 53, the aftertreatment system provided by the application further comprises: a first end cap 60 communicating the main intake port 51 and the auxiliary intake port 52; and a second end cap 70 communicating the auxiliary air outlet 53 and the main air outlet 54.

As will be readily appreciated, since the main gas inlet 51 and the auxiliary gas inlet 52 are disposed on the same plate (i.e., the partition 50), if a gas pipe is directly provided to communicate the main gas inlet 51 and the auxiliary gas inlet 52, the gas pipe is necessarily an elbow. On the one hand, the processing degree of difficulty of return bend is big, and needs to correspond the size and the shape of two gas ports and do the adjustment, and on the other hand, particulate matter is piled up easily to the crooked position in the return bend, uses for a long time and both influences the circulation of gas easily, inconvenient clearance again.

Therefore, the first end cap 60 is provided, and the first end cap 60 has a hollow interior in which gas can flow. The configuration of the first end cap 60 is not limited by the shape of the mouthpiece, as long as the first end cap 60 can simultaneously cover the main gas inlet 51 and the auxiliary gas inlet 52, so that the gas communication can be achieved, differently from the gas pipe. Meanwhile, the first end cover 60 does not need to adjust the direction of the inner space according to the flow direction of the gas, so that the inner space of the first end cover 60 is relatively free, and the tail gas with large displacement can be stably conducted.

The second end cap 70 is provided for similar purposes as the first end cap 60 and will not be described in detail.

Optionally, the aftertreatment system provided by the present application further includes a first fixing ring 6, the first fixing ring 6 is disposed on one side of the partition plate 50 departing from the first cylinder 4, and the first fixing ring 6 is hermetically connected to the total air inlet 51. The first fixing ring 6 is connected with the first end cover 60 through the first hoop component 7 in a sealing manner.

Referring to fig. 9 and 10, the first hoop assembly 7 includes a mounting ring 7a, the mounting ring 7a includes two mounting surfaces which are oppositely and obliquely arranged, and a sealing ring 7b is arranged on any one of the mounting surfaces; the first fixing ring 6 and the first end cap 60 are respectively in contact with one seal ring 7 b; the first hoop assembly 7 further comprises a hoop 7c, and the hoop 7c can tightly hold the first fixing ring 6 and the first end cover 60, so that the first fixing ring 6 is hermetically connected with the first end cover 60.

Optionally, the aftertreatment system provided by the present application further includes a second fixing ring 8, the second fixing ring 8 is disposed on a side of the partition plate 50 departing from the square-shaped mixing device, and the second fixing ring 8 is hermetically connected to the auxiliary air inlet 52. The second fixing ring 8 is connected with the first end cover 60 in a sealing way through a second hoop component 9.

The structure and the installation manner of the second hoop assembly 9 are similar to those of the first hoop assembly 7, and detailed description is omitted.

Optionally, the first end cap 60 comprises a connecting portion 61 and a cover portion 62, the cover portion 62 is connected with the connecting portion 61 in a sealing mode, and a first flow-through space is formed between the cover portion 62 and the connecting portion 61; the connection portion 61 is provided with an air inlet through hole 63 and an air outlet through hole 64, and air enters the first flow-through space through the air inlet through hole 63 and can flow out through the air outlet through hole 64.

The split first end cover 60 is arranged, so that the processing is convenient and the material is saved.

Referring to fig. 7 and 8 in particular, the connecting portion 61 is provided with an air inlet through hole 63 and an air outlet through hole 64 at intervals on the end surface close to the partition 50; meanwhile, the connection portion 61 extends toward the hood portion 62 with a certain thickness. The cover portion 62 can cover the connecting portion 61 such that a first flow-through space is formed between an end surface of the connecting portion 61 and the cover portion 62.

Optionally, the cover part 62 is provided with a clamping edge near the connecting part 61, and referring to fig. 10 in particular, when the first end cap 60 is installed, the connecting part 61 is inserted into the clamping edge, so that the inner wall of the clamping edge is attached to the outer wall of the connecting part 61, and the stability and the sealing performance of the connecting part 61 and the cover part 62 are ensured at lessons.

Optionally, the second end cap 70 includes a first cap 71 and a second cap 72, the first cap 71 is connected to the partition 50, the second cap 72 is disposed in the first cap 71, and a gap is formed between the second cap 72 and the first cap 71.

With reference to fig. 11 in particular, the second cover 72 is disposed in the first cover 71, and the skirt of the second cover 72 is hermetically connected to the first cover 71, and a second flow-through space and a heat-preserving space are formed between the second cover 72 and the first cover 71; a second flow-through space is formed between the second cover 72 and the partition 50, and the gas enters the total gas outlet 54 through the second flow-through space; the heat-insulating space is formed between the first cover 71 and the second cover 72, and the second end cap 70 has good heat-insulating and heat-preserving effects because the heat-insulating space is a sealed space and contains air with a small heat conduction coefficient.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A zigzag mixing apparatus, comprising:

a housing (10), one end of the housing (10) being open;

the fixing plate (20) is arranged at the opening, and an air inlet (21) and an air outlet (22) are arranged on the fixing plate (20);

the air inlet guide plate (30) is arranged in the shell (10) and is arranged between the air inlet (21) and the air outlet (22);

the air outlet guide plate (40) is arranged in the shell (10) and is connected with the air inlet guide plate (30);

the air inlet guide plate (30) and the air outlet guide plate (40) form a guide ring, one side of the guide ring is connected with the fixing plate (20), two ends of the guide ring are connected with the shell (10), the side wall of the guide ring is arranged at intervals with the shell (10), and the intervals form a mixing channel;

the square-shaped mixing device also comprises a urea nozzle (1) for spraying urea to the mixing channel;

gas enters the mixing channel via the gas inlet (21) and can be mixed with urea in the mixing channel.

2. Homocentric mixing device according to claim 1, characterized in that the intake baffle (30) comprises:

the first air inlet section (31) is arranged at the opening, extends obliquely from one end, close to the fixed plate (20), of the first air inlet section (31) to one end, far away from the fixed plate (20), of the first air inlet section (31) in a direction far away from the air outlet (22), and enables a mixing channel formed between the first air inlet section (31) and the shell (10) to be gradually reduced;

the second air inlet section (32), the one end of second air inlet section (32) is connected first air inlet section (31), the other end is connected guide plate (40) of giving vent to anger, second air inlet section (32) horizontal extension sets up.

3. The zigzag mixing device according to claim 1, wherein said outlet guide plate (40) comprises:

the first air outlet section (41) is arranged at the opening, extends from one end, away from the fixing plate (20), of the first air outlet section (41) to one end, close to the fixing plate (20), of the first air outlet section (41), and is obliquely arranged towards the air inlet (21) in an extending mode, so that a mixing channel formed between the first air outlet section (41) and the shell (10) is gradually increased;

the second section of giving vent to anger (42), the one end of the second section of giving vent to anger (42) is connected first section of giving vent to anger (41), the other end is connected guide plate (30) admits air, the second section of giving vent to anger (42) horizontal extension setting.

4. The homocentric mixing device according to any one of claims 1 to 3, characterized in that the end of the inlet baffle (30) remote from the outlet is connected to the outlet baffle (40) by means of an arc-shaped baffle (2).

5. The zigzag mixing device according to claim 1, further comprising a connecting plate (3), wherein the deflector ring is connected to the fixing plate (20) through the connecting plate (3);

one side of the connecting plate (3) is hermetically connected with the fixing plate (20), and the other side of the connecting plate is hermetically connected with the flow guide ring;

and two ends of the connecting plate (3) are hermetically connected with the shell (10).

6. Homocentric mixing device according to claim 1, characterized in that the air inlet (21) is circular;

and/or the air outlet (22) is in a special-shaped quadrangle shape.

7. The zigzag mixing device according to claim 1, wherein the urea nozzle (1) is disposed on the fixed plate (20), and the urea nozzle (1) is disposed opposite to the intake baffle (30) on both sides of the intake port (21).

8. An aftertreatment system, comprising the loop-shaped mixing device according to any one of claims 1 to 7, and further comprising a partition (50), wherein the partition (50) is provided with:

a main air inlet (51) connected with the first cylinder (4);

the fixing plate (20) is arranged on the partition plate (50), the air inlet (21) is connected with the auxiliary air inlet (52), and the air outlet (22) is connected with the auxiliary air outlet (53);

a main air outlet (54) connected with the second cylinder (5);

the gas enters the auxiliary gas inlet (52) after passing through the main gas inlet (51) through the first cylinder (4), then enters the mixing channel through the gas inlet (21) to be mixed with urea, and the mixed gas enters the main gas outlet (54) through the gas outlet (22) and the auxiliary gas outlet (53) and finally is discharged through the second cylinder (5).

9. The aftertreatment system of claim 8, further comprising:

a first end cover (60) communicating the main intake port (51) and the auxiliary intake port (52);

a second end cap (70) communicating the auxiliary air outlet port (53) and the main air outlet port (54).

10. The aftertreatment system of claim 9, wherein the first end cap (60) includes a connection portion (61) and a hood portion (62), the hood portion (62) being sealingly connected with the connection portion (61), the hood portion (62) and the connection portion (61) having a first flow-through space therebetween; the connecting part (61) is provided with an air inlet through hole (63) and an air outlet through hole (64), and air enters the first flow-through space through the air inlet through hole (63) and can flow out through the air outlet through hole (64);

and/or the second end cover (70) comprises a first cover body (71) and a second cover body (72), the first cover body (71) is connected with the partition plate (50), the second cover body (72) is arranged in the first cover body (71), and a gap is formed between the second cover body (72) and the first cover body (71).