CN216922274U - Mixer and engine - Google Patents

Abstract

The application discloses a mixer and an engine, comprising an outer pipe, a perforated pipe and an air inlet baffle plate; the outer pipe is provided with an air inlet and an air outlet, the perforated pipe is arranged in the outer pipe, one end of the perforated pipe is provided with an opening facing the air inlet, and a plurality of first overflowing holes are circumferentially arranged at one end of the perforated pipe; the air inlet baffle plate covers the opening, the air inlet baffle plate is provided with a plurality of coaxially arranged annular baffling parts from the central region to the peripheral region, one of the two adjacent annular baffling parts is a first annular baffling part, the other one is a second annular baffling part, and a first baffling surface of the first annular baffling part and a second baffling surface of the second annular baffling part incline towards each other and are matched with each other to form an overflowing channel communicated with the inner side and the outer side of the perforated pipe. The blender that this application disclosed promotes the distribution uniformity of the ammonia that the urea pyrolysis produced, improves the degree of consistency that waste gas and ammonia mix greatly, improves nitrogen oxide's conversion efficiency, reduces nitrogen oxide content in the waste gas, reduces the blender and takes place the risk of inefficacy.

Description

Mixer and engine

Technical Field

The application relates to the technical field of engine tail gas aftertreatment, in particular to a mixer and an engine.

Background

With the increase of the total amount of automobiles, the emission of automobile exhaust becomes an important factor of current environmental pollution, wherein most of nitrogen oxides and particulate matters are emitted from the engine which occupies an extremely low automobile holding amount, so the exhaust aftertreatment of the engine is an important link for solving the emission of the automobile exhaust, and in order to solve the problem of overhigh content of pollutants in the exhaust of the engine, the exhaust is generally treated by using a Selective Catalytic Reduction (SCR) technology. SCR is a treatment process for nitrogen oxides in the exhaust emission of an engine, so that the emission of the nitrogen oxides in the exhaust is reduced, and the engine meets the requirements of national emission regulations of six or more.

The technology generally comprises a mixer, a urea nozzle and an SCR (Selective catalytic reduction) catalyst, wherein the urea nozzle and the mixer are embedded into an exhaust pipeline, urea liquid drops in the urea nozzle and exhaust gas exhausted by an exhaust pipe jointly enter the mixer to be mixed, the mixed gas enters the SCR catalyst, the urea liquid drops are reduced into ammonia gas under the action of high temperature, the ammonia gas is used for reducing nitrogen oxides in the exhaust gas into nitrogen gas under the action of a catalyst, and the redundant ammonia gas is oxidized into nitrogen gas, so that the leakage of the nitrogen oxides is prevented and the treatment of tail gas pollutants is finished, therefore, the uniformity of mixing of the urea liquid drops and the exhaust gas in the mixer is a key step for improving the conversion efficiency of the nitrogen oxides, and is of great importance for improving the performance of an SCR system, but the existing mixer still has the defects of uneven mixing of urea liquid and the exhaust gas, serious urea crystallization blocking phenomenon and easy failure of the mixer, the engine breaks down, reduces user experience.

SUMMERY OF THE UTILITY MODEL

The present application provides a mixer and an engine to solve at least one of the above technical problems.

The technical scheme adopted by the application is as follows:

a mixer is arranged in an exhaust pipeline of an engine and comprises an outer pipe, a perforated pipe and an air inlet baffle plate, wherein the outer pipe is provided with an air inlet and an air outlet; the perforated pipe is arranged in the outer pipe, one end of the perforated pipe is provided with an opening facing the air inlet, and a plurality of first overflowing holes are circumferentially arranged; the baffling board that admits air approximately fits the opening part, the baffling board that admits air is equipped with a plurality of coaxial arrangements's annular baffling portion to the peripheral region from central zone, and one of two adjacent annular baffling portions is configured into first annular baffling portion, and another is configured into second annular baffling portion, first annular baffling portion have towards the first baffling face of second annular baffling portion, second annular baffling portion have with the relative second baffling face of first baffling face, first baffling face with second baffling face orientation inclines each other and cooperates and forms the intercommunication the passageway that overflows of the inside and outside both sides of porous pipe.

The mixer in the present application also has the following additional technical features:

first annular baffling portion with be equipped with the water conservancy diversion ring between the second annular baffling portion, the water conservancy diversion ring with first baffling face all have the water conservancy diversion clearance between the second baffling face.

The air inlet baffle plate is provided with rib plates extending radially along the radial direction, the rib plates are connected with the annular baffle portion, the rib plates are provided with a plurality of second overflowing holes, and the outer edge of the air inlet baffle plate is provided with a plurality of third overflowing holes along the circumferential direction.

The perforated pipe and the outer pipe are coaxially arranged, and a mixing flow channel is formed by matching the perforated pipe and the outer pipe; the mixer further comprises an annular air inlet baffle which is fixedly arranged between the side wall of the porous pipe and the inner wall of the outer pipe so as to cover the mixing flow channel on the gas flow path, and the annular air inlet baffle is provided with a plurality of fourth overflowing holes.

The annular air inlet baffle is further provided with a plurality of grooves which face the mixed flow channel and are sunken, and the grooves and the fourth overflowing holes are alternately arranged along the circumferential direction of the annular air inlet baffle.

The inner wall of the outer pipe is also provided with a rotational flow guide sheet extending towards the mixing flow channel.

The mixer further comprises a bent air inlet baffle, the bent air inlet baffle is matched with the inner wall of the outer pipe so as to divide the inner cavity of the outer pipe into an air inlet cavity communicated with the air inlet and a mixing cavity communicated with the air outlet, the bent air inlet baffle is provided with an air inlet hole communicated with the air inlet cavity and the mixing cavity, and the perforated pipe and the air inlet baffle are both positioned in the mixing cavity.

The bent air inlet baffle is provided with an inclined air inlet face arranged at an included angle with the central axis of the outer pipe, the air inlet holes are distributed on the inclined air inlet face, the inclined air inlet face is provided with an air inlet side and an air outlet side, and the air inlet side and the gap between the inner walls of the outer pipes are smaller than the gap between the air outlet side and the inner walls of the outer pipes.

The blender is still including locating the baffle of giving vent to anger of gas outlet department, the baffle of giving vent to anger evenly is equipped with a plurality of ventholes, the regional orientation in middle part of the baffle of giving vent to anger the air inlet direction is sunken.

The application provides an engine, includes the blender, the blender is as above the blender. Due to the adoption of the technical scheme, the technical effects obtained by the application are as follows:

1. in the mixer provided by the application, through set up the perforated pipe in the outer tube and locate the baffling board that admits air of perforated pipe opening part, make urea and waste gas that get into in the outer tube can carry out the primary mixing in baffling board department that admits air, then enter into the further mixing in the perforated pipe, and, the setting of the annular baffling portion of a plurality of coaxial arrangements of baffling board that admits air can be broken up to the urea liquid drop, and guide the mixing of urea liquid drop and waste gas through the cooperation of first baffling face and second baffling face, promote the homogeneity that the two mixes, then urea liquid drop and waste gas are further broken up through the first discharge orifice of perforated pipe circumference after getting into the perforated pipe through the diversion channel, thereby further strengthen the mixing of urea liquid drop and waste gas, along with the pyrolysis of urea liquid drop, also promote the distribution homogeneity of the ammonia that the urea pyrolysis produced, the homogeneity that waste gas and ammonia mix is greatly improved, the conversion efficiency of nitrogen oxides is improved, the content of nitrogen oxides in waste gas is reduced, the probability of urea liquid drop crystallization is reduced, and the risk of failure of the mixer is greatly reduced.

2. As a preferred embodiment of this application, through first annular baffling portion with be equipped with the water conservancy diversion ring between the second annular baffling portion, the water conservancy diversion ring with first baffling face all have the water conservancy diversion clearance between the second baffling face, when urea droplet and waste gas route baffle of admitting air, the effect of stopping of water conservancy diversion ring to urea droplet not only can be broken up it further, can also guide in the water conservancy diversion clearance of urea droplet and waste gas orientation both sides, makes the two fast flow through the water conservancy diversion passageway and under the guide effect of first baffling face and second baffling face flash mixed.

Furthermore, rib plates extending in a radial direction are arranged on the air inlet baffle plate, the rib plates are connected with the annular baffling parts, and the rib plates can be used for connecting the annular baffling parts, so that the integrity and the structural strength of the air inlet baffle plate are ensured. In addition, through be equipped with a plurality of second overflow holes on the gusset and be in the outward flange of air inlet baffling board is equipped with a plurality of third overflow holes along circumference, and the existence of second overflow hole and third overflow hole can be further broken up urea liquid drop on the one hand, promotes the ammonia homogeneity of urea pyrolysis and the degree of consistency of mixing with waste gas, and on the other hand, also can improve the velocity of flow and the smooth and easy nature that flows of waste gas and urea through the existence of second overflow hole and third overflow hole.

3. As a preferred embodiment of the present application, a mixing flow channel is formed by matching between the perforated pipe and the outer pipe, so that a small portion of the exhaust gas enters the mixing flow channel to be mixed on the basis that most of the exhaust gas and urea droplets are mixed through the perforated pipe, and the mixed liquid flowing out of the perforated pipe can be further mixed in the mixing flow channel. The annular air inlet baffle and the fourth overflowing hole can be scattered before urea liquid drops enter the mixing flow channel, and the arrangement of the fourth overflowing hole can avoid the annular air inlet baffle from forming a gas flow stagnation area, so that the probability of urea crystallization of the urea liquid drops at the position is reduced.

As a preferred embodiment of the present embodiment, the annular air intake baffle is further provided with a plurality of grooves recessed toward the mixing flow channel, and the grooves and the first overflowing holes are alternately arranged along the circumferential direction of the annular air intake baffle, so that the air flow generates a vortex at the grooves and performs an opposite-flushing exchange with the vortex at the joint of the annular air intake baffle and the inner wall of the outer tube, thereby preventing the air flow at the joint of the annular air intake baffle and the inner wall of the outer tube from failing to flow, and also improving the mixing degree of the tail gas and the ammonia gas.

As a preferred embodiment in the present embodiment, the inner wall of the outer tube is further provided with a swirl guide vane extending toward the mixing flow channel, and the swirl guide vane makes urea droplets and waste gas entering the mixing flow channel form swirl mixing, so as to accelerate evaporation and atomization of the urea droplets, improve turbulence degree of air flow, enhance sufficient mixing of the waste gas and ammonia gas, facilitate uniform distribution of the ammonia gas, and improve post-treatment conversion efficiency.

4. As a preferred embodiment of the present application, the inner cavity of the outer tube is divided into an air inlet cavity communicated with the air inlet and a mixing cavity communicated with the air outlet by the bent air inlet baffle, and the perforated tube and the air inlet baffle plate are both located in the mixing cavity, so that the waste gas and urea liquid drops entering the outer tube through the air inlet can be broken and scattered in advance by bending the air inlet baffle, and the waste gas and the urea liquid are premixed.

Further, the gap between the air inlet side and the inner wall of the outer pipe is smaller than the gap between the air outlet side and the inner wall of the outer pipe, so that the waste gas flow can smoothly pass through the air inlet hole at a high speed and be mixed and crushed with urea liquid drops, and the blockage of the air inlet hole due to the deposition of the urea liquid drops is avoided.

5. As a preferred embodiment of this application, through making the blender is still including locating the baffle of giving vent to anger of gas outlet department just the baffle of giving vent to anger evenly is equipped with a plurality of ventholes for the urea liquid that is not by the pyrolysis is further broken up through the baffle of giving vent to anger at last, promotes pyrolysis efficiency, guarantees the homogeneity of mixing of ammonia and waste gas, promotes the performance of blender. In addition, the middle part of the baffle of giving vent to anger is regional towards the air inlet direction is sunken to be located and the edge is out of step and is collided the baffle of giving vent to anger in the middle of can making this place air current, and the air current can be to diffusing all around, further increases the mixed degree of air current, improves ammonia distribution uniformity for the air current finally can be more even gets into the SCR catalyst converter, can improve the air current by a wide margin and in the mixing uniformity of SCR pretreatment step.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a schematic structural diagram of a mixer provided in an embodiment of the present application;

FIG. 2 is a schematic view of an inlet baffle from a first perspective as provided in embodiments of the present application;

FIG. 3 is a schematic view of an inlet baffle from a second perspective as provided in embodiments of the present application;

FIG. 4 is a schematic structural diagram of an annular intake baffle provided in embodiments of the present application;

FIG. 5 is a schematic structural view of a bent inlet baffle according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of an outlet baffle according to an embodiment of the present application.

Reference numerals:

1, an outer tube, 11 air inlets, 12 air outlets, 13 swirl guide plates, 14 air inlet cavities and 15 mixing cavities;

2 a perforated tube, 21 a first overflow aperture;

3, an air inlet baffle plate, 31 a first annular baffling part, 311 a first baffling surface, 32 a second annular baffling part, 321 a second baffling surface, 33 a diversion ring, 34 rib plates, 35 a second overflowing hole and 36 a third overflowing hole;

4, a mixing flow channel;

5 annular inlet baffle, 51 fourth overflowing hole, 52 groove;

6 bending an air inlet baffle, 61 air inlet holes and 62 inclined air inlet surfaces;

7 air outlet baffle plate and 71 air outlet holes.

Detailed Description

In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example in conjunction with the accompanying drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.

In addition, in the description of the present application, it is to be understood that the terms "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like refer to orientations or positional relationships illustrated in the drawings, which are used for convenience in describing the present application and to simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered limiting of the present application.

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; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. 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. In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In an embodiment of the present application, a mixer as shown in fig. 1 is provided, which may be disposed in an exhaust pipe of an engine, so that ammonia gas generated by pyrolysis of urea droplets and nitrogen oxides in exhaust gas of the engine are sufficiently mixed in the mixer. For ease of illustration and understanding, the following description is provided in the context of a product architecture based on the drawings. Of course, it is understood by those skilled in the art that the above-described structure is only used as a specific example and illustrative illustration, and does not constitute a specific limitation to the technical solution provided by the present application.

As regards the improvements of the mixer of the present application, as shown in fig. 1 to 3, the mixer comprises an outer tube 1, a perforated tube 2 and an air inlet baffle 3, the outer tube 1 having an air inlet 11 and an air outlet 12; the perforated pipe 2 is arranged in the outer pipe 1, one end of the perforated pipe 2 is provided with an opening facing the air inlet 11, and a plurality of first overflowing holes 21 are circumferentially arranged; the air inlet baffle plate 3 covers the opening, the air inlet baffle plate 3 is provided with a plurality of coaxially arranged annular baffling parts from the central region to the peripheral region, one of two adjacent annular baffling parts is configured as a first annular baffling part 31, the other annular baffling part is configured as a second annular baffling part 32, the first annular baffling part 31 is provided with a first baffling surface 311 facing the second annular baffling part 32, the second annular baffling part 32 is provided with a second baffling surface 321 opposite to the first baffling surface 311, and the first baffling surface 311 and the second baffling surface 321 incline towards each other and are matched to form a flow passage communicating the inner side and the outer side of the porous pipe 2.

It should be noted that, as shown in fig. 2, the present application schematically illustrates that the central region of the intake baffle 3 is provided with four annular baffles towards the peripheral region, and the first annular baffle 31 and the second annular baffle 32 in the present application are not particularly directed to two of the four annular baffles, which refers to that any two adjacent annular baffles of all the annular baffles illustrated in the drawing can be set as one of the first annular baffle 31 and the other as the second annular baffle 32. Of course, the number of annular baffles described in this application is not limited to four, but may also be other suitable numbers, such as three, five and more.

In the mixer provided by the application, through setting up the perforated pipe 2 and locating the air inlet baffle plate 3 at the opening of the perforated pipe 2 in the outer pipe 1, make urea liquid drop and waste gas entering the outer pipe 1 can be broken up and mixed in the air inlet baffle plate 3 preliminarily, then enter the perforated pipe 2 and mix further, moreover, the setting of the annular baffling part that the air inlet baffle plate 3 a plurality of coaxial arrangements can break up the urea liquid drop, first baffling surface 311 and second baffling surface 321 incline towards each other, make first baffling surface 311 and second baffling surface 321 can guide urea liquid drop and waste gas to mix, promote the homogeneity that the two mix, then urea liquid drop and waste gas enter the perforated pipe 2 through the diversion channel and then further break up through the first overflowing hole 21 of perforated pipe 2 circumference, thus further strengthen the mixing of urea liquid drop and waste gas, along with the pyrolysis of urea liquid drop, also promote the distribution homogeneity of the ammonia that the urea pyrolysis produced, improve the degree of consistency that waste gas and ammonia mix greatly, improve nitrogen oxide's conversion efficiency, reduce the nitrogen oxide content in the waste gas, reduce the probability of urea liquid drop crystallization, realize that the risk that the blender takes place to become invalid reduces by a wide margin.

As a preferred embodiment of the present application, as shown in fig. 2 and 3, a flow guide ring 33 may be disposed between the first annular baffle portion 31 and the second annular baffle portion 32, and a flow guide gap may be disposed between the flow guide ring 33 and each of the first flow guide surface 311 and the second flow guide surface 321.

Through the arrangement of the diversion ring 33, diversion gaps are formed between the diversion ring 33 and the first diversion surface 311 and between the diversion ring 33 and the second diversion surface 321, when urea liquid drops and waste gas pass through the air inlet baffle plate 3, the urea liquid drops can be further scattered under the blocking effect of the diversion ring 33, the urea liquid drops and the waste gas can be guided towards the diversion gaps on two sides, the urea liquid drops and the waste gas can rapidly flow through the diversion channel and are rapidly mixed under the guiding effect of the first diversion surface 311 and the second diversion surface 321, and the mixing efficiency is improved.

Further preferably, as shown in fig. 2, a rib plate 34 extending radially may be further disposed on the intake baffle plate 3 in the radial direction, the rib plate 34 is connected to the annular baffle portion, a plurality of second through holes 35 are disposed on the rib plate 34, and a plurality of third through holes 36 are disposed on the outer edge of the intake baffle plate 3 in the circumferential direction.

The air inlet baffle plate 3 is provided with rib plates 34 extending radially along the radial direction, the rib plates 34 are connected with the annular baffling parts, and the rib plates 34 can be used for connecting the annular baffling parts, so that the integrity and the structural strength of the air inlet baffle plate 3 are ensured. In addition, the rib plate 34 is provided with the second overflowing holes 35, and the outer edge of the air inlet baffle plate 3 is provided with the third overflowing holes 36 along the circumferential direction, so that the second overflowing holes 35 and the third overflowing holes 36 can further scatter urea liquid drops, the uniformity of ammonia generated by urea pyrolysis and the uniformity of mixing with exhaust gas are promoted, and the flow speed and the flow smoothness of the exhaust gas and the urea can be improved through the second overflowing holes 35 and the third overflowing holes 36. It should be noted that the outer edge of the intake baffle 3 described herein corresponds to the position of the annular baffle located at the outermost ring of the intake baffle 3.

The application schematically illustrates that a plurality of rib plates 34 are distributed on the intake baffle 3 in a crisscross manner, and as an alternative embodiment, the rib plates 34 may be set to other suitable numbers and uniformly distributed in the circumferential direction of the intake baffle 3.

As a preferred embodiment of the present embodiment, the annular baffle and the rib plate 34 may be integrally formed, so that on one hand, the processing process of the intake baffle 3 is simplified in the production process, and on the other hand, the arrangement of the connection structure between the annular baffle and the rib plate 34 and the corresponding assembly process are omitted, and the occurrence of installation errors is reduced.

As a preferred embodiment of the present application, as shown in fig. 1 and 4, the porous pipe 2 may be coaxially disposed with the outer pipe 1, and the porous pipe 2 and the outer pipe 1 cooperate to form a mixing channel 4; the mixer further comprises an annular air inlet baffle 5, the annular air inlet baffle 5 is fixedly arranged between the side wall of the porous pipe 2 and the inner wall of the outer pipe 1 so as to cover the mixing flow channel 4 on a gas flow path, and the annular air inlet baffle 5 is provided with a plurality of fourth overflowing holes 51.

Through the coaxial arrangement of the perforated pipe 2 and the outer pipe 1 and the matching formation of the perforated pipe 2 and the outer pipe 1, a mixing flow channel 4 is formed, so that on the basis that most of the exhaust gas and urea liquid drops are mixed through the perforated pipe 2, a small part of the exhaust gas enters the mixing flow channel 4 to be mixed, and the mixed liquid flowing out of the perforated pipe 2 can be further mixed in the mixing flow channel 4. The annular air inlet baffle 5 and the fourth overflowing hole 51 are arranged to scatter urea liquid drops before the urea liquid drops enter the mixing flow channel 4, and the arrangement of the fourth overflowing hole 51 can avoid a gas flow stagnation area formed at the annular air inlet baffle 5 and reduce the probability of urea crystallization at the position of the urea liquid drops.

In specific implementation, the inner edge of the annular air inlet baffle 5 can be connected with the perforated pipe 2, and the outer edge of the annular air inlet baffle is connected with the outer pipe 1, so that the perforated pipe 2 is fixed in the outer pipe 1, the internal structure of the outer pipe 1 is simplified, and the installation stability of the perforated pipe 2 in the outer pipe 1 is ensured.

As a preferred example of the present embodiment, as shown in fig. 4, the annular intake baffle 5 may be further provided with a plurality of grooves 52 recessed toward the mixing flow passage 4, and the grooves 52 and the fourth overflowing holes 51 may be alternately arranged in the circumferential direction of the annular intake baffle 5.

The arrangement of the groove 52 enables the exhaust gas flow to generate vortex at the groove 52 and carry out hedging exchange with the vortex at the joint of the annular air intake baffle 5 and the inner wall of the outer pipe 1, so that the problem that the air flow at the joint of the annular air intake baffle 5 and the inner wall of the outer pipe 1 cannot flow is avoided, and the mixing degree of the tail gas and the ammonia gas is also improved. The grooves 52 and the fourth overflowing holes 51 are alternately arranged along the circumferential direction of the annular air inlet baffle 5, so that the airflow between the perforated pipe 2 and the outer pipe 1 can be pushed to push towards the mixing flow channel 4, the airflow speed is improved, and urea liquid drops are prevented from depositing and crystallizing on the annular air inlet baffle 5.

As a preferred example of the present embodiment, as shown in fig. 1, a swirl guide piece 13 extending toward the mixing flow path 4 may be further provided on the inner wall of the outer tube 1.

Through the inner wall of outer tube 1 still is equipped with the orientation mix the whirl guide vane 13 that runner 4 extends, whirl guide vane 13 makes urea liquid drop, the waste gas that gets into in the mixing runner 4 form and mixes the whirl, and evaporation, the atomizing of urea liquid drop have accelerated the torrent degree of air current, have strengthened the intensive mixing of waste gas with the ammonia, more are favorable to the evenly distributed of ammonia, promote SCR aftertreatment conversion efficiency.

In addition, the setting of whirl water conservancy diversion piece can also reduce the contact of urea liquid drop and outer tube 1 inner wall, is favorable to avoiding the problem that urea liquid drop forms the urea crystallization at the stagnant zone of air current flow.

Preferably, the swirl guide plate 13 is made of stainless steel, so that the heat conduction performance is better, and the urea liquid drops can be quickly evaporated and pyrolyzed into ammonia gas.

As a preferred embodiment of the present application, as shown in fig. 1 and 5, the mixer may further include a bent air inlet baffle 6, the bent air inlet baffle 6 is matched with the inner wall of the outer tube 1 to divide the inner cavity of the outer tube 1 into an air inlet cavity 14 communicated with the air inlet 11 and a mixing cavity 15 communicated with the air outlet 12, the bent air inlet baffle 6 is provided with an air inlet hole 61 communicating the air inlet cavity 14 and the mixing cavity 15, and the porous tube 2 and the air inlet baffle 3 are both located in the mixing cavity 15.

The inner cavity of the outer tube 1 is divided into an air inlet cavity 14 communicated with the air inlet 11 and a mixing cavity 15 communicated with the air outlet 12 by the bent air inlet baffle 6, the porous tube 2 and the air inlet baffle plate 3 are both positioned in the mixing cavity 15, so that waste gas and urea liquid drops entering the outer tube 1 through the air inlet 11 can be broken and scattered in advance by the bent air inlet baffle 6, the waste gas and urea liquid are premixed, the premixed waste gas is scattered and mixed by the subsequent air inlet baffle plate 3, the porous tube 2 and the cyclone guide sheet 13, multiple scattering and mixing of the bent air inlet baffle plate 6, the bent air inlet baffle plate 3, the porous tube 2 and the like are carried out in sequence, and the uniformity of mixing of the waste gas and ammonia gas and the conversion rate of nitrogen oxides in the waste gas are improved.

Further preferably, as shown in fig. 5, the bent air inlet baffle 6 may further have an inclined air inlet surface 62 arranged at an included angle with the central axis of the outer tube 1, the air inlet holes 61 are distributed on the inclined air inlet surface 62, the inclined air inlet surface 62 has an air inlet side and an air outlet side, and a gap between the air inlet side and the inner wall of the outer tube 1 is smaller than a gap between the air outlet side and the inner wall of the outer tube 1.

Through making the clearance between the side of admitting air with outer tube 1 inner wall be less than the side of admitting air with the clearance between the outer tube 1 inner wall, therefore, when the waste gas air current enters into in the outer tube 1, because the clearance between the side of admitting air of the baffle 6 of admitting air of bending and the outer tube 1 inner wall is less, the atmospheric pressure of air current is promoted at this department, and the clearance between the side of giving vent to anger and the outer tube 1 inner wall is great, atmospheric pressure is discongested, consequently when flowing through inlet port 61, can make the waste gas air current pass through inlet port 61 with higher speed and smoothly and mix the breakage with the urea liquid drop, avoid urea liquid drop deposit to block up inlet port 61.

As a preferred embodiment of the present application, as shown in fig. 1 and fig. 6, the mixer may further include an air outlet baffle 7 disposed at the air outlet 12, the air outlet baffle 7 is uniformly provided with a plurality of air outlet holes 71, and a middle region of the air outlet baffle 7 is recessed toward the air inlet 11.

Through making the blender is still including locating the baffle 7 just of giving vent to anger of 12 departments of gas outlets the baffle 7 of giving vent to anger evenly is equipped with a plurality of ventholes 71 for the urea liquid that is not pyrolyzed is further broken up through the baffle 7 of giving vent to anger at last, promotes pyrolysis efficiency, guarantees the mixing uniformity of ammonia and waste gas, promotes the performance of blender. In addition, the middle part of the air outlet baffle 7 is towards the air inlet 11 is sunken, so that the middle part of the air flow collides with the edge of the air outlet baffle 7 asynchronously, the air flow can diffuse around, the mixing degree of the air flow is further increased, the ammonia distribution uniformity is improved, the air flow finally can uniformly enter the SCR catalyst, and the mixing uniformity of the air flow in the SCR pretreatment step can be greatly improved.

As a preferred embodiment of the present application, in all the aforementioned embodiments and examples of the present application, the mutually connected components of the mixer may be connected by welding, for example, the bent air inlet baffle 6, the annular air inlet baffle 5, and the air outlet baffle 7 may be all welded to the outer tube 1, and the perforated tube 2 may be welded to the annular air inlet baffle 5, so as to ensure the structural strength and impact resistance of the whole mixer, improve the service life of the mixer, and provide a pleasant user experience.

The engine provided by the application comprises the mixer, and the mixer is the mixer described in all the embodiments and examples.

Since the engine provided by the present application includes the mixer in any one of the above embodiments and examples, the beneficial effects of the mixer are all included in the engine provided by the present application, and are not described herein again.

Where not mentioned in this application, can be accomplished using or referencing existing technology.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (10)

1. A mixer disposed in an exhaust conduit of an engine, comprising:

an outer tube having an air inlet and an air outlet;

the porous pipe is arranged in the outer pipe, one end of the porous pipe is provided with an opening facing the air inlet, and a plurality of first overflowing holes are circumferentially arranged;

the baffling board admits air, the lid fits the opening part, the baffling board admits air is equipped with a plurality of coaxial arrangements's annular baffling portion to the peripheral region from central zone, and one of two adjacent annular baffling portions is configured into first annular baffling portion, and another is configured into second annular baffling portion, first annular baffling portion have towards the first baffling face of second annular baffling portion, second annular baffling portion have with the relative second baffling face of first baffling face, first baffling face with second baffling face orientation inclines each other and cooperates and forms the intercommunication the passageway that overflows of the inside and outside both sides of porous pipe.

2. A mixer according to claim 1,

first annular baffling portion with be equipped with the water conservancy diversion ring between the second annular baffling portion, the water conservancy diversion ring with first baffling face all have the water conservancy diversion clearance between the second baffling face.

3. A mixer according to claim 2,

the air inlet baffle plate is provided with rib plates extending radially along the radial direction, the rib plates are connected with the annular baffle portion, the rib plates are provided with a plurality of second overflowing holes, and the outer edge of the air inlet baffle plate is provided with a plurality of third overflowing holes along the circumferential direction.

4. A mixer according to claim 1,

the perforated pipe and the outer pipe are coaxially arranged, and a mixing flow channel is formed by matching the perforated pipe and the outer pipe;

the mixer further comprises an annular air inlet baffle which is fixedly arranged between the side wall of the porous pipe and the inner wall of the outer pipe so as to cover the mixing flow channel on the gas flow path, and the annular air inlet baffle is provided with a plurality of fourth overflowing holes.

5. A mixer according to claim 4,

the annular air inlet baffle is further provided with a plurality of grooves sunken towards the mixing flow channel, and the grooves and the fourth overflowing holes are alternately arranged along the circumferential direction of the annular air inlet baffle.

6. A mixer according to claim 4,

the inner wall of the outer pipe is also provided with a rotational flow guide sheet extending towards the mixing flow channel.

7. A mixer according to claim 1,

the mixer further comprises a bent air inlet baffle, the bent air inlet baffle is matched with the inner wall of the outer pipe so as to divide the inner cavity of the outer pipe into an air inlet cavity communicated with the air inlet and a mixing cavity communicated with the air outlet, the bent air inlet baffle is provided with an air inlet hole communicated with the air inlet cavity and the mixing cavity, and the perforated pipe and the air inlet baffle are both positioned in the mixing cavity.

8. A mixer according to claim 7,

the bent air inlet baffle is provided with an inclined air inlet face arranged at an included angle with the central axis of the outer pipe, the air inlet holes are distributed on the inclined air inlet face, the inclined air inlet face is provided with an air inlet side and an air outlet side, and the air inlet side and the gap between the inner walls of the outer pipes are smaller than the gap between the air outlet side and the inner walls of the outer pipes.

9. A mixer according to claim 1,

the blender is still including locating the baffle of giving vent to anger of gas outlet department, the baffle of giving vent to anger evenly is equipped with a plurality of ventholes, the regional orientation in middle part of the baffle of giving vent to anger the air inlet direction is sunken.

10. An engine comprising a mixer, wherein,

the mixer according to any one of claims 1 to 9.

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