CN213953719U - U-shaped after-treatment split-flow mixer - Google Patents
U-shaped after-treatment split-flow mixer Download PDFInfo
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- CN213953719U CN213953719U CN202023319723.8U CN202023319723U CN213953719U CN 213953719 U CN213953719 U CN 213953719U CN 202023319723 U CN202023319723 U CN 202023319723U CN 213953719 U CN213953719 U CN 213953719U
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Abstract
The utility model discloses a U-shaped after-treatment split-flow mixer, wherein a baffle is vertically arranged between a front shell and a rear shell, a plurality of first guide plates and a second guide plate positioned on the lower side of the first guide plates are arranged between the baffle and the rear shell; the annular cavity between the baffle and the rear shell and positioned at the outer sides of the first guide plate and the second guide plate is an air inlet cavity; the upper part of the baffle is provided with an air inlet, and the lower part of the baffle is provided with a turbulent flow hole; the first guide plate is positioned at the upper part of the air inlet cavity, and an upper air inlet flow channel is formed in the first guide plate; the second guide plate is provided with a lower air inlet flow channel. The utility model discloses a chamber of admitting air is annular channel, and the tail gas air current flows along annular channel, has avoided the inside air current dead zone that flows that exists of blender, and the tail gas air current fully preheats to each wall of baffle, back shell, first guide plate and the second guide plate that it covered in the annular channel, has avoided each wall to have the region that local temperature crosses low excessively, has reduced the risk of urea crystallization.
Description
Technical Field
The utility model belongs to the technical field of automobile exhaust aftertreatment technique and specifically relates to a shunting mixer of U type aftertreatment.
Background
With the implementation of the national six-emission regulations, countries are increasingly strict with respect to engine emission limits. Currently, diesel engines usually employ DOC (oxidative catalyst) + DPF (particulate filter) + SCR (selective catalytic reduction) technology to perform after-treatment on exhaust emission, wherein the SCR part mainly converts urea solution ejected by a urea injection system into ammonia (NH) at a certain temperature3) With NO in the diesel exhaustx(nitrogen oxide) is mixed and reduced into nitrogen (N) without pollution to the atmosphere under the action of a catalyst2) And water (H)2O）。
The mixer is limited in space for arranging the mixer due to the limited arrangement space of the engine room and the whole vehicle and strict requirement on the space size of the aftertreatment system; in order to achieve the purpose of mixing urea droplets and tail gas flow in a limited space, a throttling structure is usually designed in the mixer, and the throttling structure increases the turbulence through local flow velocity, so that the urea droplets are crushed, and the purposes of evaporating the urea droplets and mixing the urea droplets with the tail gas flow are achieved. However, the existing mixer with the throttling structure has low space utilization rate, so that partial preheating is insufficient, urea liquid drops are not sufficiently sprayed and volatilized, and the risk of urea crystallization is high.
SUMMERY OF THE UTILITY MODEL
The applicant provides a rational in infrastructure U type aftertreatment's shunting mixer to above-mentioned existing tail gas aftertreatment system's blender has space utilization lower, and local preheating is not enough, and the urea liquid drop volatilizees inadequately abundant, and the great scheduling shortcoming of urea crystallization risk, and space utilization is high, fully preheats each wall, and the urea liquid drop fully volatilizees, and urea crystallization risk is little.
The utility model discloses the technical scheme who adopts as follows:
a U-shaped after-treatment split-flow mixer is characterized in that a front shell is fixed on a rear shell, an air inlet cylinder is arranged at the upper part of the front shell, and an air outlet cylinder is arranged at the same side of the lower part of the front shell and the air inlet cylinder; a baffle is vertically arranged between the front shell and the rear shell, a plurality of first guide plates and a second guide plate positioned on the lower side of the first guide plates are arranged between the baffle and the rear shell, and the first guide plates are symmetrically arranged along the longitudinal sections in the front and rear directions; between the baffle and the rear shell, the annular cavities positioned at the outer sides of the first guide plate and the second guide plate are air inlet cavities, the cavities positioned at the inner side of the first guide plate and the upper side of the pore plate are spraying cavities, and the cavities positioned at the lower side of the pore plate and the inner side of the second guide plate are mixing cavities;
the upper part of the baffle is provided with an air inlet, the lower part of the baffle is provided with a turbulent flow hole, the air inlet is communicated with the air inlet cavity, and the turbulent flow hole is communicated with the mixing cavity;
the first guide plate is positioned at the upper part of the air inlet cavity, a plurality of first air inlet holes are formed in the first guide plate, and the first air inlet holes become upper air inlet channels and are communicated with the upper cavity body of the air inlet cavity and the injection cavity; a first blade is arranged on the first air inlet hole;
the second guide plate is positioned at the lower part of the air inlet cavity, a plurality of second air inlet holes are formed in the second guide plate, and the second air inlet holes become lower air inlet channels and are communicated with the lower cavity of the air inlet cavity and the mixing cavity; the second air inlet hole is provided with a second blade.
The utility model discloses a chamber of admitting air is annular channel, and the tail gas air current flows along annular channel, has avoided the inside air current dead zone that flows that exists of blender, and the tail gas air current fully preheats to each wall of baffle, back shell, first guide plate and the second guide plate that it covered in the annular channel, has avoided each wall to have the region that local temperature crosses low excessively, has reduced the risk of urea crystallization. The tail gas air current of intake intracavity is shunted through upper portion air inlet channel and lower part air inlet channel respectively, partial tail gas gets into from upper portion air inlet channel and sprays the chamber and mix with the urea liquid drop, get into the mixing chamber through the orifice plate, another part tail gas gets into the mixing chamber through lower part air inlet channel, with another strand of tail gas air current motion converge, the turbulence degree of air current has been increased, make the mixing rate of urea solution and tail gas increase, further disperse and preheat the urea liquid drop, the heating route of air current to the urea liquid drop has also been prolonged simultaneously, the heat utilization efficiency of tail gas has been improved, make the abundant heat absorption of urea liquid drop volatilize, the risk of urea crystallization has been reduced.
As a further improvement of the above technical solution:
a baffle plate is horizontally and transversely arranged in the middle between the baffle plate and the front shell;
when the device is used, tail gas airflow in the air inlet cavity is respectively divided through the upper air inlet flow channel and the lower air inlet flow channel, part of tail gas enters the injection cavity from the upper air inlet flow channel to be mixed with urea liquid drops and enters the mixing cavity through the pore plate, and the other part of tail gas enters the mixing cavity through the lower air inlet flow channel to move and converge with the other part of tail gas airflow.
The utility model discloses a baffle carries out the separation to the clearance of baffle and preceding shell, avoids the direct clearance outflow blender of following between the two of tail gas air current and influences the conversion efficiency of tail gas.
The baffle is sequentially provided with a trapezoidal part, a waist-contracting part and a circular part from top to bottom; the upper part of the trapezoid part is small and the lower part is large, and the contour size of the waist at the two sides of the waist-contracting part and the contour size of the periphery of the round part are matched with the contour of the corresponding side wall surface of the rear shell; the trapezoidal part is positioned at the inner side of the air inlet cylinder, and air inlets are respectively formed at the outer sides of two waists of the trapezoidal part; the circular part is positioned at the inner side of the air outlet cylinder, and the plate surface of the circular part is provided with a plurality of interference flow holes.
The plurality of first guide plates are arranged on the inner sides of the two waists of the trapezoidal part of the baffle, and the two first guide plates are respectively arranged in an outward inclined mode along the vertical line; the included angle between the two first guide plates is consistent with the urea spray cone angle, and the included angle alpha between the first guide plates and the plumb line ranges from 10 degrees to 20 degrees.
The first blade of first guide plate is towards spraying the chamber inwards, slant under shed, and the opening direction of first blade and urea injection direction syntropy.
The utility model discloses a first blade guide tail gas air current gets into towards slant decurrent angle and sprays the chamber, makes the air current direction that gets into the injection chamber unanimous with the urea spray jet direction that the urea nozzle sprays, has reduced the impact of air current to the urea spray jet, prevents that the urea spray jet from receiving the air current influence and directly striking the wall of first guide plate, has reduced the risk of urea crystallization.
The opening areas of the first air inlets of the first guide plate are sequentially reduced from top to bottom, and the areas of the corresponding first blades are also sequentially reduced from top to bottom.
The utility model discloses a trompil area of first inlet port reduces from the top down in proper order, the area of the first blade that corresponds also reduces from the top down in proper order, the air current that gets into from each first inlet port can have the difference of admitting air like this, make the air current that sprays the chamber increase along urea injection direction in proper order, play effectual dispersion and add the heating effect in advance to the urea liquid drop that sprays, the heating route of air current to the urea liquid drop has also been prolonged simultaneously, the heat utilization efficiency of tail gas has been improved, make the urea liquid drop fully absorb heat and volatilize, avoid the urea liquid drop to drop on the internal face of corresponding part and form the urea crystallization, the risk of urea crystallization has been reduced.
The rear side edge of the first guide plate is provided with a plurality of gaps, and a plurality of airflow channels are formed between the rear side edge of the first guide plate and the inner wall surface of the rear shell.
The utility model discloses a form a plurality of airflow channel between the rear side edge of first guide plate and the internal face of back shell, the part tail gas air current of chamber of admitting air flows along a plurality of back shell internal faces, gets into from a plurality of airflow channel and sprays the intracavity, fully preheats the wall of back shell, makes the abundant heat absorption of the urea liquid drop of drippage volatilize, reduces the risk of urea crystallization.
The upper part of the second guide plate is provided with two vertical plate parts which are opposite, the lower part of the second guide plate is provided with a preferred arc-shaped arc plate part, and the two vertical plate parts form a waist-contracting structure on the upper side of the arc plate part; the two vertical plate parts are positioned at the inner side of the middle waist part of the rear shell, and the arc plate parts are positioned at the lower part of the rear shell and the inner side of the air outlet cylinder; the upper edges of the two vertical plate parts are connected with the lower edges of the two first guide plates.
The second vanes of the second baffle open outwardly toward the intake chamber.
The utility model discloses a two riser portions of second guide plate form at arc board portion upside and receive waist structure, are favorable to reducing the mobile separation of air current, more do benefit to the abundant heat absorption of urea liquid drop and volatilize, have also improved the velocity of flow that the air current flows through the orifice plate simultaneously, have reduced the crystallization risk and the flow loss of urea liquid drop in orifice plate department. The second blade is towards the outside opening of chamber of admitting air, and the second blade guide tail gas air current is on the lateral wall face of back shell lower part of flowing outward, preheats the lateral wall face of back shell lower part, avoids back shell local temperature to hang down excessively, has reduced the risk of urea crystallization.
A pore plate is horizontally arranged between the lower parts of the first guide plates, and a plurality of through holes are formed in the pore plate; the pore plate is a concave spherical surface plate; the top of the rear shell is provided with a nozzle seat, the nozzle seat is opposite to the injection cavity, and a urea nozzle is arranged in the nozzle seat.
The utility model discloses a orifice plate is recessed spherical surface plate, has accelerateed the breakage of the big particle size liquid drop of urea, more is favorable to the abundant heat absorption of urea solution to volatilize, reduces the risk of urea crystallization.
The utility model has the advantages as follows:
the utility model discloses a chamber of admitting air is annular channel, and the tail gas air current flows along annular channel, has avoided the inside air current dead zone that flows that exists of blender, and the tail gas air current fully preheats to each wall of baffle, back shell, first guide plate and the second guide plate that it covered in the annular channel, has avoided each wall to have the region that local temperature crosses low excessively, has reduced the risk of urea crystallization. The tail gas air current of intake intracavity is shunted through upper portion air inlet channel and lower part air inlet channel respectively, partial tail gas gets into from upper portion air inlet channel and sprays the chamber and mix with the urea liquid drop, get into the mixing chamber through the orifice plate, another part tail gas gets into the mixing chamber through lower part air inlet channel, with another strand of tail gas air current motion converge, the turbulence degree of air current has been increased, make the mixing rate of urea solution and tail gas increase, further disperse and preheat the urea liquid drop, the heating route of air current to the urea liquid drop has also been prolonged simultaneously, the heat utilization efficiency of tail gas has been improved, make the abundant heat absorption of urea liquid drop volatilize, the risk of urea crystallization has been reduced.
The utility model discloses a baffle carries out the separation to the clearance of baffle and preceding shell, avoids the direct clearance outflow blender of following between the two of tail gas air current and influences the conversion efficiency of tail gas.
The utility model discloses a first blade guide tail gas air current gets into towards slant decurrent angle and sprays the chamber, makes the air current direction that gets into the injection chamber unanimous with the urea spray jet direction that the urea nozzle sprays, has reduced the impact of air current to the urea spray jet, prevents that the urea spray jet from receiving the air current influence and directly striking the wall of first guide plate, has reduced the risk of urea crystallization.
The utility model discloses a trompil area of first inlet port reduces from the top down in proper order, the area of the first blade that corresponds also reduces from the top down in proper order, the air current that gets into from each first inlet port can have the difference of admitting air like this, make the air current that sprays the chamber increase along urea injection direction in proper order, play effectual dispersion and add the heating effect in advance to the urea liquid drop that sprays, the heating route of air current to the urea liquid drop has also been prolonged simultaneously, the heat utilization efficiency of tail gas has been improved, make the urea liquid drop fully absorb heat and volatilize, avoid the urea liquid drop to drop on the internal face of corresponding part and form the urea crystallization, the risk of urea crystallization has been reduced.
The utility model discloses a form a plurality of airflow channel between the rear side edge of first guide plate and the internal face of back shell, the part tail gas air current of chamber of admitting air flows along a plurality of back shell internal faces, gets into from a plurality of airflow channel and sprays the intracavity, fully preheats the wall of back shell, makes the abundant heat absorption of the urea liquid drop of drippage volatilize, reduces the risk of urea crystallization.
The utility model discloses a two riser portions of second guide plate form at arc board portion upside and receive waist structure, are favorable to reducing the mobile separation of air current, more do benefit to the abundant heat absorption of urea liquid drop and volatilize, have also improved the velocity of flow that the air current flows through the orifice plate simultaneously, have reduced the crystallization risk and the flow loss of urea liquid drop in orifice plate department. The second blade is towards the outside opening of chamber of admitting air, and the second blade guide tail gas air current is on the lateral wall face of back shell lower part of flowing outward, preheats the lateral wall face of back shell lower part, avoids back shell local temperature to hang down excessively, has reduced the risk of urea crystallization.
The utility model discloses a orifice plate is recessed spherical surface plate, has accelerateed the breakage of the big particle size liquid drop of urea, more is favorable to the abundant heat absorption of urea solution to volatilize, reduces the risk of urea crystallization.
Drawings
Fig. 1 is a perspective view of the present invention.
Fig. 2 is an exploded view of fig. 1.
Fig. 3 is a front view of fig. 1.
Fig. 4 is a sectional view taken along line a-a of fig. 3.
Fig. 5 is a front view with the front housing, inlet barrel, outlet barrel, baffle, and baffle removed.
In the figure: 1. a front housing; 2. a rear housing; 3. an air inlet cylinder; 4. an air outlet cylinder; 5. a nozzle holder; 6. a baffle plate; 61. a trapezoidal portion; 62. closing the waist; 63. a circular portion; 64. a flow-disturbing hole; 7. a partition plate; 8. a first baffle; 81. a first air intake hole; 82. a first blade; 83. a notch; 9. a second baffle; 91. a vertical plate portion; 92. an arc plate portion; 93. a second air intake hole; 94. a second blade; 10. an orifice plate; 11. an air inlet; 101. an air inlet cavity; 102. an ejection chamber; 103. a mixing chamber.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1, 2 and 3, the cross section of the whole body of the utility model along the longitudinal axis is in the shape of peanut shell, the front shell 1 of the utility model is fixed on the rear shell 2, and an inner cavity is formed between the front shell 1 and the rear shell 2; the upper part of the front shell 1 is provided with a cylindrical air inlet cylinder 3, and the lower part of the front shell is provided with a cylindrical air outlet cylinder 4 at the same side with the air inlet cylinder 3; a baffle 6 is vertically arranged between the front shell 1 and the rear shell 2 along the radial direction; a baffle plate 7 is horizontally and transversely arranged in the middle between the baffle plate 6 and the front shell 1, so that a gap between the baffle plate 6 and the front shell 1 is blocked, and the problem that the tail gas flow directly flows out of the mixer from the gap between the baffle plate and the front shell to influence the conversion efficiency of the tail gas is avoided; a plurality of symmetrical first guide plates 8 and second guide plates 9 positioned on the lower sides of the first guide plates 8 are axially arranged between the baffle 6 and the rear shell 2, in the embodiment, two first guide plates 8 are symmetrically arranged along the front-rear longitudinal section, one second guide plate 9 is arranged on the lower side of each first guide plate 8, a pore plate 10 is horizontally arranged between the lower parts of the two first guide plates 8, and a plurality of through holes are formed in the pore plate 10; as shown in fig. 4 and 5, between the baffle 6 and the rear housing 2, the annular cavity located outside the first guide plate 8 and the second guide plate 9 is an air inlet cavity 101, the cavity located inside the first guide plate 8 and above the orifice plate 10 is an injection cavity 102, the cavity located below the orifice plate 10 and inside the second guide plate 9 is a mixing cavity 103, and a plurality of through holes on the orifice plate 10 communicate the injection cavity 102 and the mixing cavity 103; the air inlet cavity 101 is an annular channel, tail gas airflow flows along the annular channel, an airflow flowing dead zone in the mixer is avoided, the tail gas airflow in the annular channel fully preheats the wall surfaces of the baffle 6, the rear shell 2, the first guide plate 8 and the second guide plate 9 which are covered by the tail gas airflow, the local temperature of the wall surfaces is prevented from being too low, and the risk of urea crystallization is reduced. As shown in fig. 1, 2, and 3, a nozzle holder 5 is provided on the top of the rear housing 2, the nozzle holder 5 faces the injection chamber 102, and a urea nozzle (not shown) is provided in the nozzle holder 5 and can inject urea droplets into the injection chamber 102.
As shown in fig. 2, the baffle 6 comprises a trapezoidal portion 61, a waist-contracting portion 62 and a circular portion 63 in sequence from top to bottom; the trapezoidal part 61 is small at the top and big at the bottom, and the two waists of the trapezoidal part incline outwards along the plumb line; the contour dimensions of both side waists of the waisted portion 62 and the outer peripheral contour dimension of the circular portion 63 are matched with the contour of the corresponding side wall surface of the rear housing 2, and are fixed to the side wall surface of the rear housing 2 by welding. As shown in fig. 1 and 3, the trapezoidal portion 61 is located inside the intake cylinder 3, the intake ports 11 are formed outside both waists of the trapezoidal portion 61, and both the intake ports 11 communicate with the intake chamber 101; the circular portion 63 is located inside the air outlet cylinder 4, a plurality of turbulence holes 64 are formed in the plate surface of the circular portion 63, and the turbulence holes 64 are communicated with the mixing cavity 103.
As shown in fig. 1, 2 and 4, the two first guide plates 8 are located on the upper portion of the air inlet cavity 101 and are arranged on the inner sides of the two waists of the trapezoidal portion 61 of the baffle 6, the two first guide plates 8 are respectively arranged in a manner that the plumb lines incline outwards, the included angle between the two first guide plates 8 is consistent with the urea spray cone angle, the urea spray is facilitated to be freely developed, and the included angle alpha range between the first guide plates 8 and the plumb lines is 10-20 degrees. As shown in fig. 2 and 5, the first guide plate 8 is provided with a plurality of square first air inlet holes 81 from top to bottom, the first air inlet holes 81 become upper air inlet channels and communicate the upper cavity of the air inlet cavity 101 with the injection cavity 102, and a part of tail gas in the air inlet cavity 101 enters the injection cavity 102 through the plurality of first air inlet holes 81 to be mixed with urea liquid droplets and pyrolyzed; the first air inlet hole 81 is provided with a square first blade 82, the first blade 82 is opened inwards and obliquely downwards towards the injection cavity 102, and the opening direction of the first blade 82 is the same as the urea injection direction. The first blades 82 guide the tail gas airflow to enter the injection cavity 102 at an oblique downward angle, so that the direction of the airflow entering the injection cavity 102 is consistent with the urea spray direction sprayed by the urea nozzle, the impact of the airflow on the urea spray is reduced, the urea spray is prevented from directly impacting the wall surface of the first guide plate 8 under the influence of the airflow, and the risk of urea crystallization is reduced; the first guide plate 8 is provided with a plurality of first air inlets 81, the opening area of the first air inlets 81 is sequentially reduced from top to bottom, the area of the corresponding first blades 82 is also sequentially reduced from top to bottom, so that air flows entering from the first air inlets 81 have air inlet differences, the air flows in the injection cavity 102 are sequentially increased along the urea injection direction, the injected urea liquid drops are effectively dispersed and preheated, meanwhile, the heating path of the air flows to the urea liquid drops is also prolonged, the heat utilization efficiency of tail gas is improved, the urea liquid drops are fully heat-absorbed and volatilized, the urea liquid drops are prevented from falling onto the inner wall surfaces of corresponding parts to form urea crystals, and the risk of the urea crystals is reduced. The rear side edge of the first guide plate 8 is welded and fixed on the inner wall surface of the rear shell 2, a plurality of notches 83 are formed in the rear side edge of the first guide plate 8, as shown in fig. 4, a plurality of airflow channels are formed between the rear side edge of the first guide plate 8 and the inner wall surface of the rear shell 2, part of tail gas airflow of the air inlet cavity 101 flows along the inner wall surfaces of the plurality of rear shells 2 and enters the injection cavity 102 from the airflow channels, the wall surface of the rear shell 2 is fully preheated, dropped urea liquid drops are fully absorbed and volatilized, and the risk of urea crystallization is reduced.
As shown in fig. 2, 4 and 5, the second baffle 9 is located at the lower part of the air intake cavity 101, the upper part of the second baffle 9 is provided with two vertical plate parts 91 and an arc-shaped plate part 92, the two vertical plate parts 91 are located at the inner side of the middle waist part of the rear housing 2, and the arc-shaped plate part 92 is located at the lower part of the rear housing 2 and at the inner side of the air outlet cylinder 4. The upper edges of the two vertical plate parts 91 are connected with the lower edges of the two first guide plates 8, and the pore plate 10 is arranged at the lower part of the first guide plate 8 and close to the connecting part of the vertical plate parts 91 and the first guide plates 8; two riser portions 91 form the structure of bowing in arc portion 92 upside, are favorable to reducing the flow separation of air current, more do benefit to the abundant heat absorption of urea liquid drop and volatilize, have also improved the velocity of flow that the air current flows through orifice plate 10 simultaneously, have reduced the crystallization risk and the flow loss of urea liquid drop in orifice plate 10 department. As shown in fig. 2, 4 and 5, the arc plate portion 92, the arc surfaces on two opposite sides of the arc plate portion 92 are respectively provided with a plurality of square second air inlet holes 93, the second air inlet holes 93 become lower air inlet flow channels and communicate the lower cavity of the air inlet cavity 101 with the mixing cavity 103, part of the tail gas in the air inlet cavity 101 enters the mixing cavity 103 through the plurality of second air inlet holes 93 to be mixed with the air flow entering vertically from the injection cavity 102, the two air flows have different flow directions, and after movement and convergence, the turbulence degree of the air flow is increased, so that the mixing rate of the urea solution and the tail gas is increased, urea droplets are further dispersed and preheated, meanwhile, the heating path of the air flow to the urea droplets is also prolonged, the heat utilization efficiency of the tail gas is improved, the urea droplets are fully absorbed and volatilized, and the risk of urea crystallization is reduced; the second air inlet hole 93 is provided with a square second vane 94, the second vane 94 opens outwards towards the air inlet cavity 101, the second vane 94 guides the tail gas to flow outwards towards the side wall surface of the lower part of the rear shell 2, the side wall surface of the lower part of the rear shell 2 is preheated, the local temperature of the rear shell 2 is prevented from being too low, and the risk of urea crystallization is reduced.
As shown in fig. 2, 4 and 5, the orifice plate 10 is a concave spherical plate, which accelerates the breaking of urea droplets with large particle size, and is more beneficial to the urea solution to fully absorb heat and volatilize, and reduces the risk of urea crystallization.
The utility model discloses be applied to U type aftertreatment ware, its air inlet cylinder 3 is connected with DPF (particulate filter), and air outlet cylinder 4 is connected with SCR (selective catalytic reduction). During actual use, urea liquid drops are sprayed into the spraying cavity 102 through a urea nozzle in the nozzle seat 5, tail gas airflow treated by the DPF enters the air inlet cavity 101 from the air inlet cylinder 3 through the air inlets 11 on the two sides, the tail gas is divided in the air inlet cavity 101 through the upper air inlet flow channel and the lower air inlet flow channel, part of the tail gas enters the spraying cavity 102 from the upper air inlet flow channel to be mixed with the urea liquid drops and enters the mixing cavity 103 through the orifice plate 10, and the other part of the tail gas enters the mixing cavity 103 through the lower air inlet flow channel to move and converge with the other part of the tail gas airflow and flows out to the SCR from the plurality of flow disturbing holes 64.
The utility model discloses an air inlet chamber 101 is annular channel, fully preheats the wall of each inside component, has avoided each wall to have the region that local temperature hangs down excessively, has reduced the risk of urea crystallization. The tail gas air current in the air inlet cavity 101 is shunted through the upper air inlet flow channel and the lower air inlet flow channel respectively, so that the turbulence degree of the air current is increased, the mixing rate of the urea solution and the tail gas is increased, and the risk of urea crystallization is reduced.
The above description is illustrative of the present invention and is not intended to limit the present invention, and the present invention may be modified in any manner without departing from the spirit of the present invention.
Claims (10)
1. A U-shaped after-treatment split-flow mixer is characterized in that a front shell (1) is fixed on a rear shell (2), an air inlet cylinder (3) is arranged at the upper part of the front shell (1), and an air outlet cylinder (4) is arranged at the same side of the lower part of the front shell (1) and the air inlet cylinder (3); the method is characterized in that: a baffle (6) is vertically arranged between the front shell (1) and the rear shell (2), a plurality of first guide plates (8) and second guide plates (9) positioned on the lower sides of the first guide plates (8) are arranged between the baffle (6) and the rear shell (2), and the first guide plates (8) are symmetrically arranged along the longitudinal sections in the front and rear directions; between the baffle (6) and the rear shell (2), the annular cavity at the outer sides of the first guide plate (8) and the second guide plate (9) is an air inlet cavity (101), the cavity at the inner side of the first guide plate (8) and the upper side of the pore plate (10) is an injection cavity (102), and the cavity at the lower side of the pore plate (10) and the inner side of the second guide plate (9) is a mixing cavity (103);
the upper part of the baffle (6) is provided with an air inlet (11), the lower part of the baffle (6) is provided with a flow disturbing hole (64), the air inlet (11) is communicated with the air inlet cavity (101), and the flow disturbing hole (64) is communicated with the mixing cavity (103);
the first guide plate (8) is positioned at the upper part of the air inlet cavity (101), a plurality of first air inlet holes (81) are formed in the first guide plate (8), and the first air inlet holes (81) become upper air inlet channels and are communicated with the upper cavity body of the air inlet cavity (101) and the injection cavity (102); a first blade (82) is arranged on the first air inlet hole (81);
the second guide plate (9) is positioned at the lower part of the air inlet cavity (101), a plurality of second air inlet holes (93) are formed in the second guide plate (9), and the second air inlet holes (93) become lower air inlet flow channels and are communicated with the lower cavity body of the air inlet cavity (101) and the mixing cavity (103); the second air inlet hole (93) is provided with a second blade (94).
2. The U-shaped aftertreatment split-flow mixer of claim 1 wherein: a clapboard (7) is horizontally and transversely arranged in the middle between the baffle (6) and the front shell (1);
when the device is used, tail gas airflow in the air inlet cavity (101) is respectively divided through the upper air inlet flow channel and the lower air inlet flow channel, part of tail gas enters the injection cavity (102) from the upper air inlet flow channel to be mixed with urea liquid drops and enters the mixing cavity (103) through the pore plate (10), and the other part of tail gas enters the mixing cavity (103) through the lower air inlet flow channel to move and converge with the other tail gas airflow.
3. The U-shaped aftertreatment split-flow mixer of claim 1 wherein: the baffle (6) is sequentially provided with a trapezoidal part (61), a waist-contracting part (62) and a circular part (63) from top to bottom; the upper part of the trapezoid part (61) is small, the lower part of the trapezoid part is large, and the outline size of the waist at two sides of the waist closing part (62) and the outline size of the periphery of the round part (63) are matched with the outline of the corresponding side wall surface of the rear shell (2); the trapezoid part (61) is positioned at the inner side of the air inlet cylinder (3), and air inlets (11) are respectively formed at the outer sides of two waists of the trapezoid part (61); the circular part (63) is positioned at the inner side of the air outlet cylinder (4), and the plate surface of the circular part (63) is provided with a plurality of interference flow holes (64).
4. The U-shaped aftertreatment split-flow mixer of claim 1 wherein: the first guide plates (8) are arranged on the inner sides of the two waist parts of the trapezoidal part (61) of the baffle (6), and the two first guide plates (8) are respectively arranged in an outward inclined mode along the vertical line; the included angle between the two first guide plates (8) is consistent with the urea spray cone angle, and the included angle alpha between the first guide plates (8) and the plumb line ranges from 10 degrees to 20 degrees.
5. The U-shaped aftertreatment split-flow mixer of claim 1 wherein: the first blade (82) of the first guide plate (8) is opened inwards and downwards obliquely towards the injection cavity (102), and the opening direction of the first blade (82) is the same as the urea injection direction.
6. The U-shaped aftertreatment split-flow mixer of claim 1 wherein: the opening areas of the plurality of first air inlet holes (81) of the first flow guide plate (8) are sequentially reduced from top to bottom, and the areas of the corresponding first blades (82) are also sequentially reduced from top to bottom.
7. The U-shaped aftertreatment split-flow mixer of claim 1 wherein: a plurality of gaps (83) are formed in the rear side edge of the first guide plate (8), and a plurality of airflow channels are formed between the rear side edge of the first guide plate (8) and the inner wall surface of the rear shell (2).
8. The U-shaped aftertreatment split-flow mixer of claim 1 wherein: the upper part of the second guide plate (9) is provided with two vertical plate parts (91) which are opposite, the lower part is provided with an arc plate part (92) with a good arc shape, and the two vertical plate parts (91) form a waist-closing structure at the upper side of the arc plate part (92); the two vertical plate parts (91) are positioned at the inner side of the middle waist part of the rear shell (2), and the arc plate part (92) is positioned at the lower part of the rear shell (2) and at the inner side of the air outlet cylinder (4); the upper edges of the two vertical plate parts (91) are connected with the lower edges of the two first guide plates (8).
9. The U-shaped aftertreatment split-flow mixer of claim 1 wherein: the second vane (94) of the second baffle plate (9) opens out towards the air inlet chamber (101).
10. The U-shaped aftertreatment split-flow mixer of claim 1 wherein: a pore plate (10) is horizontally arranged between the lower parts of the first guide plates (8), and a plurality of through holes are formed in the pore plate (10); the pore plate (10) is a concave spherical plate; the top of the rear shell (2) is provided with a nozzle seat (5), the nozzle seat (5) is opposite to the injection cavity (102), and a urea nozzle is arranged in the nozzle seat (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023319723.8U CN213953719U (en) | 2020-12-31 | 2020-12-31 | U-shaped after-treatment split-flow mixer |
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| Application Number | Priority Date | Filing Date | Title |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112459879A (en) * | 2020-12-31 | 2021-03-09 | 无锡亿利环保科技有限公司 | U-shaped after-treatment split-flow mixer |
| CN114151174A (en) * | 2021-11-22 | 2022-03-08 | 保定市屹马汽车配件制造有限公司 | SCR mixer of automobile exhaust system |
| WO2023065383A1 (en) * | 2021-10-18 | 2023-04-27 | 无锡威孚力达催化净化器有限责任公司 | Hollow square-shaped mixing device and post-treatment system |
-
2020
- 2020-12-31 CN CN202023319723.8U patent/CN213953719U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112459879A (en) * | 2020-12-31 | 2021-03-09 | 无锡亿利环保科技有限公司 | U-shaped after-treatment split-flow mixer |
| WO2023065383A1 (en) * | 2021-10-18 | 2023-04-27 | 无锡威孚力达催化净化器有限责任公司 | Hollow square-shaped mixing device and post-treatment system |
| CN114151174A (en) * | 2021-11-22 | 2022-03-08 | 保定市屹马汽车配件制造有限公司 | SCR mixer of automobile exhaust system |
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