CN216077282U - Urea mixer with forward air intake - Google Patents
Urea mixer with forward air intake Download PDFInfo
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- CN216077282U CN216077282U CN202122694551.0U CN202122694551U CN216077282U CN 216077282 U CN216077282 U CN 216077282U CN 202122694551 U CN202122694551 U CN 202122694551U CN 216077282 U CN216077282 U CN 216077282U
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Abstract
The utility model discloses a urea mixer with forward air inlet, wherein a front baffle and a rear baffle are arranged in an outer cylinder at intervals, an inner cylinder is arranged between the front baffle and the rear baffle, a central pipe is inserted in the inner cylinder, a mounting hole is formed in the outer cylinder corresponding to the central pipe, and a protective pipe is arranged on the outer cylinder and surrounds the periphery of the mounting hole; the lower part of the protective tube extends into the central tube, an air inlet channel is formed between the outer wall surface of the protective tube and the inner wall surface of the central tube, and the air inlet direction of the air inlet channel is the same as the spraying direction of the urea spray. The air inlet direction of the air inlet channel is the same as the spraying direction of the urea spray, and the air flow is mixed with urea liquid drops in the mixing cavity along the direction of the urea spray, so that the impact of the air flow on the urea liquid drops is reduced, the urea liquid drops are prevented from being blown to the wall surfaces of other elements by the air flow to form urea crystals, and the risk of the urea crystals is reduced.
Description
Technical Field
The utility model relates to the technical field of after-treatment of engine tail gas, in particular to a urea mixer for forward air intake.
Background
At present, in an engine exhaust gas after-treatment system, a Selective Catalytic Reduction (SCR) technology is generally adopted to carry out after-treatment on exhaust gas emission of an engine, urea aqueous solution is sprayed into a urea mixing device, and the urea aqueous solution is decomposed into ammonia (NH) at the exhaust gas temperature3) Ammonia gas (NH) under the action of catalyst3) Removing Nitrogen Oxides (NO) from exhaust gasesX) Reduction to harmless nitrogen (N)2) And water (H)2O), and finally discharged from the tail gas pipe, thereby achieving the purpose of reducing the emission.
Most of the existing urea mixers adopt a transverse air inlet mode, the direction of air inlet flow is perpendicular to the urea injection direction, the air inlet flow directly blows urea spray beams, urea liquid drops easily scatter and fall onto the wall surfaces of other elements in the mixer under the impact of high-speed air flow, the falling point of the urea liquid drops is difficult to control, and the risk of urea crystallization is increased.
SUMMERY OF THE UTILITY MODEL
The applicant provides a forward air inlet urea mixer with a reasonable structure aiming at the defects of the existing urea mixing device, air flow enters along the urea spraying direction, the air inlet air flow is prevented from directly blowing urea spray beams, and the risk of urea crystallization is reduced.
The technical scheme adopted by the utility model is as follows:
a urea mixer with forward air inlet is characterized in that a front baffle and a rear baffle are arranged in an outer cylinder at intervals, an inner cylinder is arranged between the front baffle and the rear baffle, and a cavity between the front baffle and the rear baffle is divided into an air inlet cavity and an air outlet cavity by the inner cylinder; the front baffle is provided with an air inlet communicated with the air inlet cavity, and the rear baffle is provided with an air outlet communicated with the air outlet cavity; a central tube is inserted on the inner tube, and the inner cavity of the central tube is a mixing cavity; the upper end pipe orifice of the central pipe is an air inlet port which is communicated with the air inlet cavity and the mixing cavity; the lower end pipe orifice of the central pipe is an air outlet port which is communicated with the mixing cavity and the air outlet cavity; the outer barrel is provided with a mounting hole corresponding to the central tube, and a protective tube is arranged on the outer barrel and surrounds the periphery of the mounting hole; the lower part of the protective tube extends into the central tube, an air inlet channel is formed between the outer wall surface of the protective tube and the inner wall surface of the central tube, and the air inlet direction of the air inlet channel is the same as the spraying direction of the urea spray.
As a further improvement of the above technical solution:
a plurality of guide vanes are arranged in the air inlet channel, and the guide vanes have downward inclined inclination angles.
The upper part of the central tube extends into the air inlet cavity, the lower part of the central tube extends into the air outlet cavity, and a plurality of waist-shaped first air inlet holes are formed in the circumferential wall surface of the upper end part of the central tube; the guide vanes are fixed on the wall surface of the central pipe and positioned between two adjacent first air inlet holes.
The wall surface of the protective pipe is provided with a plurality of waist-shaped second air inlet holes along the circumferential direction.
The guide ring is fixed in the protective tube and formed by downwards punching the center of the circular ring, a horizontal connecting part and a conical guide part extending downwards are formed after punching, the connecting part is fixed on the inner wall surface of the protective tube, and the guide part is opposite to a second air inlet of the protective tube.
The guide part of the guide ring is a tapered ring with a big top and a small bottom.
The inner cylinder and the outer cylinder are arranged in a non-coaxial way, and the inner cylinder is positioned at the lower position of the center.
The upper side of the inner cylinder is provided with a concave side plane, and the side plane is provided with a through hole for inserting a central tube; the inner cylinder is provided with a bulge at the rear side of the side plane.
The outer edge of the front baffle is provided with a plurality of connecting sheets which are fixed on the inner wall surface of the outer cylinder, and an air inlet is formed between the adjacent connecting sheets.
A plurality of layers of crushing plates are arranged in the central tube and below the protective tube, a plurality of first through holes are formed in the plate surface of each crushing plate, and the crushing plates of adjacent layers are arranged in a staggered manner; the outer contour dimension of the rear baffle is matched with the inner contour dimension of the outer barrel, a pore plate is arranged on the lower portion of an air outlet of the rear baffle, the pore plate is a double-arc plate, and a plurality of second through holes are formed in the surface of the pore plate.
The utility model has the following beneficial effects:
the air inlet direction of the air inlet channel is the same as the spraying direction of the urea spray, and the air flow is mixed with urea liquid drops in the mixing cavity along the direction of the urea spray, so that the impact of the air flow on the urea liquid drops is reduced, the urea liquid drops are prevented from being blown to the wall surfaces of other elements by the air flow to form urea crystals, and the risk of the urea crystals is reduced; and the forward air inlet also improves the speed of urea liquid drops when the urea liquid drops are impacted with the crushing plate downwards, improves the crushing effect, is more favorable for fully crushing and pyrolyzing the urea liquid drops, and improves the urea decomposition efficiency. The pillar encloses the periphery that keeps off at the urea nozzle, and the pillar provides the effect of sheltering from for the urea spray, avoids the air current to blow the urea spray directly and form the urea crystallization on the wall that falls other components with urea liquid drop scattered all around, has reduced the risk of urea crystallization.
The air inlet channel is internally provided with the guide blades, the airflow entering from the air inlet port forms rotating airflow after flowing through the guide blades, and the rotating airflow is accelerated to be mixed with urea liquid drops, so that the mixing uniformity of the urea liquid drops is improved, the urea liquid drops are favorably and fully crushed and pyrolyzed, and the urea decomposition efficiency is improved. The central tube is provided with the first air inlet hole, and the air flow entering from the first air inlet hole can effectively blow off the possibly remained urea liquid drops on the inner wall surface of the central tube, so that the urea crystal is prevented from being formed on the inner wall surface of the central tube. The guide vanes are positioned between two adjacent first air inlet holes, and the air flow entering from the first air inlet holes flows downwards along the wall surface of the central pipe by changing the direction of the air flow between the two guide vanes, so that the urea falling point can be blown off, and the urea crystallization is prevented from being formed.
The second air inlet hole is formed in the protective pipe, air flow in the air inlet cavity can directly enter the protective pipe through the second air inlet hole to be premixed with urea liquid drops, the mixing effect of the urea liquid drops and the air flow is improved, the urea liquid drops are fully crushed and pyrolyzed, and the urea decomposition efficiency is improved. The guide part of the guide ring can shield and guide the airflow entering the second air inlet, and the airflow flows along the urea spraying direction and is mixed with urea liquid drops under the guide of the conical surface of the guide part, so that the downward impact speed of the urea liquid drops is accelerated while the impact on the urea liquid drops is reduced, and the crushing effect of the urea liquid drops is improved.
The inner cylinder and the outer cylinder are arranged in a non-coaxial mode, the inner cylinder is located at the position with the center lower, space is left for the upper portion of the inner cylinder, air inlet space of the air inlet port of the central tube is enlarged, and reduction of air inlet back pressure is facilitated. The side plane of the inner cylinder is concave, further, a space is given for the upper part of the inner cylinder, the air inlet space of the air inlet port is further increased, and the air inlet back pressure is further reduced. The inner cylinder is provided with a bulge, so that the rigidity of the inner cylinder can be improved, and the radiation noise caused by overlarge airflow can be avoided.
Drawings
Fig. 1 is a perspective view of the present invention.
Fig. 2 is an exploded view of the present invention.
Fig. 3 is a cross-sectional view of the present invention.
Fig. 4 is an enlarged view of a portion a in fig. 3.
In the figure: 1. an outer cylinder; 11. mounting holes; 2. a front baffle; 21. connecting sheets; 22. an air inlet; 3. a tailgate; 31. an air outlet; 4. an inner barrel; 41. a side plane; 42. inserting holes; 43. a protrusion; 5. a central tube; 51. an air inlet port; 52. an air outlet port; 53. a first air intake hole; 54. an air intake passage; 6. protecting the pipe; 61. a second air intake hole; 7. a guide ring; 71. a connecting portion; 72. a guide portion; 8. a guide blade; 9. a breaker plate; 91. a first through hole; 10. an orifice plate; 101. a second through hole;
20. an air inlet cavity; 30. an air outlet cavity; 40. a mixing chamber.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1 to 3, a front baffle 2 and a rear baffle 3 which are radially arranged are sequentially arranged in the cylindrical outer cylinder 1 at intervals along the air inlet direction, an inner cylinder 4 which is axially arranged is arranged between the front baffle 2 and the rear baffle 3, the inner cylinder 4 divides a cavity between the front baffle 2 and the rear baffle 3 into an air inlet cavity 20 which is positioned outside the inner cylinder 4 and an air outlet cavity 30 which is positioned inside the inner cylinder 4, the air inlet cavity 20 is an annular cavity which surrounds the periphery of the inner cylinder 4, and the circumferential wall surface of the inner cylinder 4 can be preheated by airflow which surrounds the air inlet cavity 20, so that urea crystallization of the inner cylinder 4 is avoided. As shown in fig. 1 and 2, the front baffle 2 covers the front end face of the inner cylinder 4, a plurality of connecting pieces 21 protrude outwards from the outer edge of the front baffle 2, the connecting pieces 21 are welded and fixed on the inner wall surface of the outer cylinder 1, an air inlet 22 is formed between adjacent connecting pieces 21, and the air inlet 22 is communicated with the air inlet cavity 20. As shown in fig. 2 to 4, the backplate 3 covers the annular surface between the outer cylinder 1 and the inner cylinder 4, the outer contour dimension of the backplate 3 matches with the inner contour dimension of the outer cylinder 1, the plate surface of the backplate 3 is provided with an air outlet 31, and the air outlet 31 is communicated with the air outlet cavity 30.
As shown in fig. 1 to 4, a central tube 5 is inserted into the inner tube 4, and the inner cavity of the central tube 5 forms a mixing chamber 40. The upper part of the central tube 5 extends into the air inlet cavity 20, a distance is reserved between the top end of the central tube 5 and the inner wall surface of the upper side of the outer tube 1, an air inlet port 51 is formed by an upper end pipe orifice of the central tube 5, the air inlet port 51 is communicated with the air inlet cavity 20 and the mixing cavity 40, and air flow in the air inlet cavity 20 enters the mixing cavity 40 from the air inlet port 51; the lower part of the central tube 5 extends into the air outlet cavity 30, a space is reserved between the bottom end of the central tube 5 and the inner wall surface of the lower side of the inner tube 4, an air outlet port 52 is formed at the lower end pipe orifice of the central tube 5, the air outlet port 52 is communicated with the mixing cavity 40 and the air outlet cavity 30, and air flow in the mixing cavity 40 enters the air outlet cavity 30 from the air outlet port 52. The circumferential wall surface of the upper end part of the central tube 5 is provided with a plurality of waist-shaped first air inlet holes 53, and the air flow entering from the first air inlet holes 53 can effectively blow off the urea drops possibly remained on the inner wall surface of the central tube 5, so as to prevent the urea crystals from being formed on the inner wall surface of the central tube 5.
As shown in fig. 1 to 4, the outer tube 1 is provided with a mounting hole 11 corresponding to the center tube 5, and the mounting hole 11 is used for mounting a nozzle holder (not shown) connected to a urea nozzle which can spray urea droplets into the center tube 5.
As shown in fig. 2 and 3, a protection pipe 6 is fixed on the inner wall surface of the upper side of the outer cylinder 1 corresponding to the mounting hole 11, the protection pipe 6 surrounds the periphery of the mounting hole 11, that is, the protection pipe 6 surrounds the periphery of the urea nozzle, the protection pipe 6 provides a shielding effect for the urea spray, the urea spray is prevented from being blown by the air flow directly to form urea crystals on the wall surfaces of other elements, and the risk of the urea crystals is reduced. A plurality of waist-shaped second air inlet holes 61 are formed in the wall surface of the protective pipe 6 along the circumferential direction, air flow of the air inlet cavity 20 can directly enter the protective pipe 6 through the second air inlet holes 61 to be premixed with urea liquid drops, the mixing effect of the urea liquid drops and the air flow is improved, the urea liquid drops are fully crushed and pyrolyzed, and the urea decomposition efficiency is improved.
As shown in fig. 3 and 4, the lower part of the protection tube 6 extends into the central tube 5, an annular air inlet channel 54 is formed between the outer wall surface of the lower part of the protection tube 6 and the inner wall surface of the upper end part of the central tube 5, the air flow in the air inlet cavity 20 vertically enters the mixing cavity 40 through the air inlet channel 54, namely the air inlet direction of the air inlet channel 54 is the same as the spraying direction of the urea spray, the air flow is mixed with urea droplets in the mixing cavity 40 along the direction of the urea spray, the impact of the air flow on the urea droplets is reduced, the urea droplets are prevented from being blown down onto the wall surfaces of other elements by the air flow to form urea crystals, and the risk of the urea crystals is reduced; and the forward air inlet also improves the speed of urea liquid drops when the urea liquid drops are impacted with the crushing plate 9 downwards, improves the crushing effect, is more favorable for fully crushing and pyrolyzing the urea liquid drops, and improves the urea decomposition efficiency. In the inlet channel 54, be provided with a plurality of guide vane 8 along circumference, guide vane 8 downward sloping, have downward inclination, form rotatory air current after the air current that gets into from inlet port 51 flows through guide vane 8, rotatory air current mixes with the urea liquid drop with higher speed, improves the mixing uniformity of urea liquid drop, does benefit to the abundant broken pyrolysis of urea liquid drop, improves urea decomposition efficiency. The guide vanes 8 are welded and fixed on the inner wall surface of the central tube 5, the guide vanes 8 are positioned between two adjacent first air inlet holes 53, and the air flow entering from the first air inlet holes 53 is deflected from the space between the two guide vanes 8, so that the air flow flows downwards along the wall surface of the central tube 5, the urea falling point can be blown off, and the urea crystal is prevented from being formed.
As shown in fig. 3 and 4, a guide ring 7 is fixed in the protective tube 6, the guide ring 7 is formed by punching downwards at the center of a circular ring, a horizontal connecting part 71 and a conical guide part 72 extending downwards are formed after punching, the connecting part 71 is fixed on the inner wall surface of the protective tube 6 by welding, and the guide part 72 is a conical ring with a large top and a small bottom; the guide part 72 is over against the second air inlet hole 61 of the protection pipe 6, the guide part 72 can shield and guide the airflow entering the second air inlet hole 61, and the airflow flows along the urea spraying direction and is mixed with urea droplets under the guide of the conical surface of the guide part 72, so that the impact on the urea droplets is reduced, the downward impact speed of the urea droplets is increased, and the crushing effect of the urea droplets is improved.
As shown in fig. 2 and 3, the inner cylinder 4 and the outer cylinder 1 are arranged in different axes, the inner cylinder 4 is located at a position with a lower center, a space is provided for the upper part of the inner cylinder 4, the distance between the air inlet 51 of the central tube 5 and the inner wall surface of the upper side of the outer cylinder 1 is increased, the air inlet space of the air inlet 51 is increased, and the reduction of the intake back pressure is facilitated. The upper surface of the inner cylinder 4 is provided with a concave side plane 41, and the side plane 41 is provided with a through hole 42 for inserting the central tube 5. The side plane 41 is recessed to further give room for the upper part of the inner cylinder 4, and the distance between the air inlet 51 of the central tube 5 and the inner wall surface of the upper side of the outer cylinder 1 is increased, so that the air inlet space of the air inlet 51 is further increased, and the air inlet back pressure is further reduced. The rear end of the side plane 41 does not extend to the rear port of the inner barrel 4, the inner barrel 4 is provided with a bulge 43 at the rear side of the side plane 41, and the bulge 43 can increase the rigidity of the inner barrel 4 and avoid radiation noise caused by excessive airflow.
As shown in fig. 2 and 3, a plurality of layers of crushing plates 9 arranged up and down are fixedly arranged in the central pipe 5 and below the protective pipe 6, a plurality of first through holes 91 are formed in the plate surface of each crushing plate 9, and the crushing plates 9 of adjacent layers are arranged in a staggered manner, so that the urea droplets are guaranteed to be better crushed, and meanwhile, the lower airflow pressure drop is realized.
As shown in fig. 2 and 3, the orifice plate 10 is arranged at the lower part of the air outlet 31 of the rear baffle 3, the orifice plate 10 is a minor arc plate, the second through holes 101 are formed in the surface of the orifice plate 10, and the air flow in the air outlet cavity 30 flows through the orifice plate 10 to form a rotational flow, so that the mixing effect of the air flow is improved, and the mixing uniformity is higher.
In practical use, the device is arranged between a DPF (particle trap) component and an SCR (selective catalytic reduction) component of exhaust gas after-treatment; tail gas is input from the output end of the DPF and enters the air inlet cavity 20 through the air inlet 22, most of the air flow in the air inlet cavity 20 enters the mixing cavity 40 through the air inlet port 51, a small part of the air flow enters the mixing cavity 40 through the first air inlet hole 53, and the other small part of the air flow enters the protective pipe 6 through the second air inlet hole 61; the urea nozzle sprays urea liquid drops into the protective pipe 6, the urea liquid drops enter the mixing cavity 40 downwards after being premixed with the air flow in the protective pipe 6 and are mixed with the other two air flows, and the mixed air flow continuously flows downwards through the crushing plate 9, then enters the air outlet cavity 30 from the air outlet port 52, flows out from the air outlet 31 and is output to the SCR assembly.
The foregoing description is illustrative of the present invention and is not to be construed as limiting thereof, as the utility model may be modified in any manner without departing from the spirit thereof.
Claims (10)
1. A forward air inlet urea mixer is characterized in that a front baffle (2) and a rear baffle (3) are arranged in an outer cylinder (1) at intervals, an inner cylinder (4) is arranged between the front baffle (2) and the rear baffle (3), and the inner cylinder (4) divides a cavity between the front baffle (2) and the rear baffle (3) into an air inlet cavity (20) and an air outlet cavity (30); the front baffle (2) is provided with an air inlet (22) communicated with the air inlet cavity (20), and the rear baffle (3) is provided with an air outlet (31) communicated with the air outlet cavity (30); the method is characterized in that: a central tube (5) is inserted on the inner tube (4), and the inner cavity of the central tube (5) is a mixing cavity (40); an upper end pipe orifice of the central pipe (5) is an air inlet port (51), and the air inlet port (51) is communicated with the air inlet cavity (20) and the mixing cavity (40); a pipe orifice at the lower end of the central pipe (5) is an air outlet port (52), and the air outlet port (52) is communicated with the mixing cavity (40) and the air outlet cavity (30);
a mounting hole (11) is formed in the outer barrel (1) corresponding to the central tube (5), a protective tube (6) is arranged on the outer barrel (1), and the protective tube (6) surrounds the periphery of the mounting hole (11);
the lower part of the protective pipe (6) extends into the central pipe (5), an air inlet channel (54) is formed between the outer wall surface of the protective pipe (6) and the inner wall surface of the central pipe (5), and the air inlet direction of the air inlet channel (54) is the same as the spraying direction of the urea spray.
2. The forward air intake urea mixer of claim 1, wherein: a plurality of guide vanes (8) are arranged in the air inlet channel (54), and the guide vanes (8) have downward inclined angles.
3. The forward air intake urea mixer of claim 1, wherein: the upper part of the central tube (5) extends into the air inlet cavity (20), the lower part of the central tube (5) extends into the air outlet cavity (30), and the circumferential wall surface of the upper end part of the central tube (5) is provided with a plurality of waist-shaped first air inlet holes (53); the guide vanes (8) are fixed on the wall surface of the central pipe (5), and the guide vanes (8) are positioned between two adjacent first air inlet holes (53).
4. The forward air intake urea mixer of claim 1, wherein: the wall surface of the protective tube (6) is provided with a plurality of waist-shaped second air inlet holes (61) along the circumferential direction.
5. The forward air intake urea mixer of claim 1, wherein: a guide ring (7) is fixed in the protective tube (6), the guide ring (7) is formed by downwards punching the center of a circular ring, a horizontal connecting part (71) and a conical guide part (72) extending downwards are formed after punching, the connecting part (71) is fixed on the inner wall surface of the protective tube (6), and the guide part (72) is over against a second air inlet hole (61) of the protective tube (6).
6. The forward air intake urea mixer of claim 5, wherein: the guide part (72) of the guide ring (7) is a conical ring with a large upper part and a small lower part.
7. The forward air intake urea mixer of claim 1, wherein: the inner cylinder (4) and the outer cylinder (1) are arranged in different axes, and the inner cylinder (4) is positioned at the lower position of the center.
8. The forward air intake urea mixer of claim 1, wherein: the upper side of the inner cylinder (4) is provided with a concave side plane (41), and the side plane (41) is provided with a through hole (42) for inserting the central tube (5); the inner cylinder (4) has a projection (43) on the rear side of the side plane (41).
9. The forward air intake urea mixer of claim 1, wherein: the outer edge of the front baffle (2) is provided with a plurality of connecting pieces (21), the connecting pieces (21) are fixed on the inner wall surface of the outer cylinder (1), and an air inlet (22) is formed between the adjacent connecting pieces (21).
10. The forward air intake urea mixer of claim 1, wherein: a plurality of layers of crushing plates (9) are arranged in the central pipe (5) and below the protective pipe (6), a plurality of first through holes (91) are formed in the surface of each crushing plate (9), and the crushing plates (9) in adjacent layers are arranged in a staggered manner; the outer contour dimension of the rear baffle (3) is matched with the inner contour dimension of the outer barrel (1), a pore plate (10) is arranged on the lower portion of an air outlet (31) of the rear baffle (3), the pore plate (10) is a minor arc plate, and a plurality of second through holes (101) are formed in the surface of the pore plate (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122694551.0U CN216077282U (en) | 2021-11-05 | 2021-11-05 | Urea mixer with forward air intake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122694551.0U CN216077282U (en) | 2021-11-05 | 2021-11-05 | Urea mixer with forward air intake |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216077282U true CN216077282U (en) | 2022-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122694551.0U Active CN216077282U (en) | 2021-11-05 | 2021-11-05 | Urea mixer with forward air intake |
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|---|---|
| CN (1) | CN216077282U (en) |
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2021
- 2021-11-05 CN CN202122694551.0U patent/CN216077282U/en active Active
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