CN214118294U - Diesel engine tail gas mixing device - Google Patents
Diesel engine tail gas mixing device Download PDFInfo
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- CN214118294U CN214118294U CN202023053920.XU CN202023053920U CN214118294U CN 214118294 U CN214118294 U CN 214118294U CN 202023053920 U CN202023053920 U CN 202023053920U CN 214118294 U CN214118294 U CN 214118294U
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Abstract
The utility model discloses a diesel engine tail gas mixing device, wherein a gas inlet baffle and a gas outlet component are arranged in a shell, a central tube is arranged between the gas inlet baffle and the gas outlet component along the axial direction, and a first bulge is arranged on the surface of the gas inlet baffle to form a first opening and a second opening; a plurality of second through holes are formed in the circumferential wall surface of the central pipe; the air outlet assembly is provided with a plurality of opening parts and a second bulge, and the outer edge of the second bulge is outwards opened to form a third opening. The airflow of the utility model rotates and enters the mixing cavity, thus reducing the risk of urea crystallization; the air current in the water conservancy diversion intracavity has three air outlet channel, and the air current flows from three passageway respectively, and the air current velocity of flow distribution homogeneity is high, and the crystallization risk is low, and the mixture of tail gas and ammonia is more even.
Description
Technical Field
The utility model belongs to the technical field of diesel engine tail gas aftertreatment technique and specifically relates to a diesel engine tail gas mixing arrangement.
Background
At present, in a diesel engine exhaust gas after-treatment system, a Selective Catalytic Reduction (SCR) technology is generally adopted to carry out after-treatment on the exhaust gas emission of an engine; in order to enable urea droplets to be adequately combined in an aftertreatment systemUniformly mixing the tail gas of the diesel engine, adding a mixer in a post-treatment system, spraying a urea aqueous solution into the mixer, and heating the urea aqueous solution by the tail gas to decompose the urea aqueous solution into ammonia (NH)3) 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.
The existing tail gas aftertreatment mixing device generally has the problems of poor uniformity of gas flow velocity distribution and poor ammonia mixing uniformity. Poor uniformity of gas flow velocity distribution can lead to non-uniform catalyst aging on the one hand; on the other hand, because the gas flow velocity is not uniformly distributed, the temperature of the inner wall surface of the area with smaller gas flow velocity in the exhaust aftertreatment mixing device is lower, and a part of heat can be taken away after urea liquid drops contact with the inner wall surface of the part, so that the temperature of the inner wall surface of the part is further reduced, urea liquid drops falling on the inner wall surface with too low temperature easily form urea crystals due to insufficient heat absorption and volatilization, the performance of an aftertreatment system is further influenced, and even more, the exhaust exceeds the standard or the aftertreatment system is blocked to cause insufficient vehicle power. Poor ammonia mixing uniformity results in poor nitrogen oxide conversion efficiency and causes some ammonia to escape, thereby affecting the overall performance of the catalyst.
SUMMERY OF THE UTILITY MODEL
The applicant aims at the defects that the existing tail gas aftertreatment mixing device is poor in gas flow velocity distribution uniformity, easy to form urea crystals and poor in mixing uniformity, and provides a diesel engine tail gas mixing device which is reasonable in structure, high in gas flow velocity distribution uniformity, low in crystallization risk and high in mixing uniformity.
The utility model discloses the technical scheme who adopts as follows:
a diesel engine tail gas mixing device is characterized in that an air inlet baffle and an air outlet assembly are arranged in a shell along the radial direction, a central tube is transversely arranged between the air inlet baffle and the air outlet assembly along the axial direction, and a cavity in the shell, which is positioned between the air inlet baffle and the air outlet assembly and outside the central tube, is a flow guide cavity; the outer periphery of the air inlet baffle is matched with the inner periphery of the shell in contour size, a first bulge is arranged on the plate surface of the air inlet baffle in a raised mode to form a first opening and a second opening, and a mixing cavity is formed on the inner side of the first bulge; the inner channel of the central tube is communicated with the air outlet end part of the shell, a plurality of second through holes are formed in the circumferential wall surface of the central tube, and the second through holes and the inner channel form a first air outlet channel and conduct the flow guide cavity and the air outlet end part of the shell; the outer periphery outline size of the air outlet assembly is matched with the inner periphery outline size of the shell; the air outlet assembly is provided with a plurality of opening parts and a second bulge, and the outer edge of the second bulge is outwards opened to form a third opening; the second bulge is positioned on the inner side of the hole part, an air outlet cavity is formed between the second bulge and the hole part, and the air outlet cavity is communicated with the third opening; the opening part is provided with a plurality of first through holes which become second air outlet channels, a conduction flow guide cavity and an air outlet cavity; a gap is formed between the outer edge of the hole part and the corresponding part of the second bulge to form a gas outlet, and the gas outlet is used as a third gas outlet channel and communicated with the flow guide cavity and the gas outlet cavity.
When the tail gas airflow of the utility model flows through the air inlet baffle, the plate surface of the air inlet baffle and the first cambered surface of the first bulge are preheated, so that urea liquid drops falling on the plate surface and the first cambered surface can fully absorb heat and volatilize, and the risk of urea crystallization is reduced; the tail gas airflow meets urea liquid drops in the mixing cavity through the first opening in a screwed mode, the airflow accelerates under the action of the first cambered surface to swirl, circulation is formed after the airflow is screwed into the mixing cavity, the sprayed urea liquid drops are effectively dispersed and preheated, meanwhile, the heating path of the airflow to the urea liquid drops is also prolonged, the heat utilization efficiency of the tail gas is improved, the urea liquid drops are made to absorb heat fully and volatilize, the urea liquid drops are prevented from falling onto the inner wall surfaces of corresponding parts to form urea crystals, the risk of the urea crystals is reduced, the performance of a post-treatment system is guaranteed, excessive emission or blockage of the post-treatment system is avoided, and the vehicle power requirement is guaranteed. The air current in the water conservancy diversion intracavity flows through first air outlet channel, second air outlet channel, third air outlet channel respectively, further improves the homogeneity of air current velocity of flow, improves the mixing uniformity of ammonia for the urea liquid drop fully absorbs the heat and volatilizes, has reduced the risk of urea crystallization.
As a further improvement of the above technical solution:
the first bulge is an arc bulge and is provided with a first arc surface; the second bulge is an arc bulge and is provided with a second arc surface.
The air outlet assembly is provided with a plane part on the upper part and close to the outer edge.
The plane part is an annular plane, and the area of the annular plane is 25% -35% of the area of the cross section of the shell.
The utility model discloses a plane part of subassembly of giving vent to anger makes third opening and second cambered surface more be close to the center tube, can force the high-speed gas flow direction third opening that is close to the shell internal face to flow, improves the velocity distribution after the air current flows, and the velocity distribution of air current after making the outflow is more even.
The center of the air outlet component is provided with a sleeve which is sleeved on the periphery of the air outlet end part of the central tube.
The air outlet assembly is in a round shape formed by combining a plurality of air outlet baffle plates; the outer side of one side of the plate surface part of the air outlet baffle extends outwards to form a hole part, a second bulge is arranged on the plate surface part in a protruding mode, the second bulge is located on the other side part opposite to the hole part, an inwards concave arc-shaped flanging is arranged on the inner side of the plate surface part in a turning mode, and a plane part is arranged on the upper edge and the edge close to the outer side of the plate surface part; after the air outlet baffle plates are closed, the air outlet baffle plates are counted up in a clockwise sequence, the second bulge of the previous air outlet baffle plate is positioned on the inner side of the hole part of the adjacent rear air outlet baffle plate, the flanging of each air outlet baffle plate is enclosed into a circular sleeve, and the plane parts of the air outlet baffle plates are combined to form a circle of annular plane.
The front end part of the central tube penetrates through the air inlet baffle; the central tube adopts a pipe fitting with one closed end and one open end, or the front end face of the central tube is covered with a cover plate to realize the closure of the front end part.
The front end face of the central tube is fixed on the inner side wall face of the air inlet baffle plate, and the front end face of the central tube is sealed.
A nozzle seat is arranged on the shell and opposite to the first opening of the air inlet baffle, and a urea nozzle is arranged in the nozzle seat; a choke plate is arranged on the inner wall surface of the shell and positioned on the outer side of the air inlet side of the nozzle seat; the choke plate is located obliquely above the first opening.
The utility model discloses a choke plate sets up in the outside that the nozzle block is located one side of admitting air, avoids tail gas air current directly to blow urea and spouts the ray, and blow the urea liquid drop and fall on the wall of the baffle that admits air and form the urea crystallization, and simultaneously, the tail gas air current under the guide of choke plate, with admit air the baffle and act together, changes the direction and the velocity of flow of air current, the first opening of the baffle that admits air of all remitting.
The periphery of the shell is provided with a first heat-preservation component and a second heat-preservation component which are semi-cylindrical, and the first heat-preservation component and the second heat-preservation component are combined into a cylinder shape and sleeved on the periphery of the cylinder body of the shell; the air outlet end part of the shell is provided with an air outlet connecting piece, and the wall surface of the air inlet end part is provided with a differential pressure sensor seat and a temperature sensor seat.
The utility model discloses a heat preservation subassembly plays the heat preservation effect to the wall of shell, guarantees that the wall of shell remains throughout at higher temperature, makes the urea liquid drop that falls on the wall pyrolysis of volatilizing rapidly, avoids having the low temperature region on the wall, reduces the risk of urea crystallization, guarantees aftertreatment system's performance.
The utility model has the advantages as follows:
when the tail gas airflow of the utility model flows through the air inlet baffle, the plate surface of the air inlet baffle and the first cambered surface of the first bulge are preheated, so that urea liquid drops falling on the plate surface and the first cambered surface can fully absorb heat and volatilize, and the risk of urea crystallization is reduced; the tail gas airflow meets urea liquid drops in the mixing cavity through the first opening in a screwed mode, the airflow accelerates under the action of the first cambered surface to swirl, circulation is formed after the airflow is screwed into the mixing cavity, the sprayed urea liquid drops are effectively dispersed and preheated, meanwhile, the heating path of the airflow to the urea liquid drops is also prolonged, the heat utilization efficiency of the tail gas is improved, the urea liquid drops are made to absorb heat fully and volatilize, the urea liquid drops are prevented from falling onto the inner wall surfaces of corresponding parts to form urea crystals, the risk of the urea crystals is reduced, the performance of a post-treatment system is guaranteed, excessive emission or blockage of the post-treatment system is avoided, and the vehicle power requirement is guaranteed. The air current in the water conservancy diversion intracavity flows through first air outlet channel, second air outlet channel, third air outlet channel respectively, further improves the homogeneity of air current velocity of flow, improves the mixing uniformity of ammonia for the urea liquid drop fully absorbs the heat and volatilizes, has reduced the risk of urea crystallization.
The utility model discloses a plane part of subassembly of giving vent to anger makes third opening and second cambered surface more be close to the center tube, can force the high-speed gas flow direction third opening that is close to the shell internal face to flow, improves the velocity distribution after the air current flows, and the velocity distribution of air current after making the outflow is more even.
The utility model discloses a choke plate sets up in the outside that the nozzle block is located one side of admitting air, avoids tail gas air current directly to blow urea and spouts the ray, and blow the urea liquid drop and fall on the wall of the baffle that admits air and form the urea crystallization, and simultaneously, the tail gas air current under the guide of choke plate, with admit air the baffle and act together, changes the direction and the velocity of flow of air current, the first opening of the baffle that admits air of all remitting.
The utility model discloses a heat preservation subassembly plays the heat preservation effect to the wall of shell, guarantees that the wall of shell remains throughout at higher temperature, makes the urea liquid drop that falls on the wall pyrolysis of volatilizing rapidly, avoids having the low temperature region on the wall, reduces the risk of urea crystallization, guarantees aftertreatment system's performance.
Drawings
Fig. 1 is a perspective view of the present invention.
Fig. 2 is an exploded view of fig. 1.
Fig. 3 is a schematic structural view of fig. 1 with the outer shell, the heat preservation member and the air outlet connecting member removed, wherein arrows indicate the trend of air flow.
Fig. 4 is a perspective view of the intake baffle.
Fig. 5 is a perspective view of the air outlet assembly.
Fig. 6 is a perspective view of the air outlet baffle.
In the figure: 1. a housing; 2. an air outlet connecting piece; 3. a differential pressure sensor seat; 4. a temperature sensor seat; 5. a first thermal insulation assembly; 6. a second heat-insulating component; 7. a nozzle holder; 71. spraying rays on urea;
8. an intake baffle; 81. plate surface; 82. a central bore; 83. a first protrusion; 84. a first arc surface; 85. a first opening; 86. a second opening; 87. a mixing chamber;
9. an air outlet assembly; 91. an air outlet baffle; 911. a plate surface portion; 912. an opening part; 913. a second protrusion; 914. a second arc surface; 915. flanging; 916. a first through hole; 917. a planar portion; 92. an air outlet; 93. a third opening; 94. an air outlet cavity;
10. a central tube; 101. a cover plate; 102. a second through hole;
11. a choke plate;
20. and a flow guide cavity.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1, 2 and 3, the outlet end of the cylindrical housing 1 of the present invention is provided with an outlet connector 2, the wall surface of the inlet end is provided with a differential pressure sensor holder 3, a temperature sensor holder 4 and a nozzle holder 7, and a urea nozzle (not shown in the figure) is arranged in the nozzle holder 7; the periphery of shell 1 is provided with first heat preservation subassembly 5 and second heat preservation subassembly 6, first heat preservation subassembly 5, second heat preservation subassembly 6 are the semi-cylindrical, the synthetic cylinder of two lamella, the cover is established in the barrel periphery of shell 1, play the heat preservation effect to the wall of shell 1, guarantee that the wall of shell 1 remains throughout at higher temperature, the pyrolysis that volatilizees rapidly of the urea liquid drop that makes on falling the wall, it is regional to have the low temperature on the wall to avoid, reduce the risk of urea crystallization, guarantee aftertreatment system's performance. A circular air inlet baffle 8 is vertically arranged on the inner wall surface of the front end of the shell 1 along the radial direction, and the outer contour size of the air inlet baffle 8 is matched with the inner contour size of the shell 1; an air outlet assembly 9 is vertically arranged behind the air inlet baffle plate 8 along the radial direction; a central tube 10 is transversely arranged between the air inlet baffle 8 and the air outlet assembly 9 along the axial direction, the central tube 10 is positioned in the center of the shell 1, the front end part and the rear end part of the central tube respectively penetrate through the air inlet baffle 8 and the air outlet assembly 9, and a flow guide cavity 20 is arranged in the shell 1 and positioned between the air inlet baffle 8 and the air outlet assembly 9 and in the cavity outside the central tube 10. As shown in fig. 2 and 3, the end of the central tube 10 penetrating through the air inlet baffle 8 is covered with a cover plate 101, an internal channel with one closed end and one open end is formed in the central tube 10, so as to prevent the tail gas from directly flowing out from the internal channel of the central tube 10 without mixing, and in other embodiments, the central tube 10 may also be processed into a pipe with one closed end and one open end; a plurality of through second through holes 102 are formed in the circumferential wall surface of the central tube 10, the second through holes 102 are communicated with an internal channel of the central tube 10, the second through holes 102 and the internal channel of the central tube 10 become a first air outlet channel, the air outlet end part of the flow guide cavity 20 and the shell 1 is communicated, and a part of the flow guide cavity 20 flows out through the first air outlet channel.
As shown in fig. 4, a center hole 82 is formed in the center of the plate surface 81 of the intake baffle 8, and as shown in fig. 3, the front end of the center pipe 10 protrudes through the center hole 82. A first arc-shaped protrusion 83 is protruded outwards towards the air inlet direction at the lower part of the plate surface 81 and positioned at one side of the central hole 82, and the first protrusion 83 is provided with a first arc surface 84; the first protrusion 83 protrudes directly outward from the plate surface 81, the upper edge of the first protrusion is split from the plate surface 81, an axial first opening 85 and a radial second opening 86 are formed on the intake baffle plate 8, and a mixing cavity 87 is formed inside the first protrusion 83; as shown in fig. 3, the first opening 85 of the air inlet baffle 8 faces the nozzle holder 7 and is located right below the nozzle holder 7, and the urea injection line 71 injected by the urea nozzle in the nozzle holder 7 faces the first opening 85 and is injected into the mixing chamber 87. When the tail gas airflow flows through the air inlet baffle plate 8, one part of the airflow collides with the plate surface 81 to turn to form rotational flow and winds into the first opening 85 along the edge of the air inlet baffle plate 8, the other part of the airflow collides with the first cambered surface 84 of the first protrusion 83, is guided to the plate surface 81 along the first cambered surface 84 and is mixed with the other part of the airflow to wind into the first opening 85, and the two parts preheat the plate surface 81 of the air inlet baffle plate 8 and the first cambered surface 84 of the first protrusion 83 respectively before winding into the first opening 85, so that urea droplets falling on the plate surface 81 and the first cambered surface 84 are fully volatilized in a heat absorption manner, and the risk of urea crystallization is reduced; the tail gas airflow is screwed into the mixing cavity 87 through the first opening 85 to meet urea liquid drops, the airflow is accelerated to swirl under the action of the first cambered surface 84, circulation is formed after the airflow is screwed into the mixing cavity 87, the sprayed urea liquid drops are effectively dispersed and preheated, meanwhile, the heating path of the airflow to the urea liquid drops is also prolonged, the heat utilization efficiency of the 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 surface of a corresponding component to form urea crystals, the risk of the urea crystals is reduced, the performance of a post-treatment system is guaranteed, the emission standard exceeding or the blocking of the post-treatment system is avoided, and the vehicle power requirement is guaranteed. As shown in fig. 1, 2, and 3, a choke plate 11 is fixedly provided on the inner wall surface of the front end of the housing 1 in front of the intake damper 8, the choke plate 11 is located obliquely above the first opening 85 and blocks the outside of the urea nozzle in the nozzle holder 7, that is, the choke plate 11 is provided on the outside of the nozzle holder 7 on the intake side, so as to prevent the exhaust gas flow from blowing the urea injection line 71 straight and blowing urea droplets onto the wall surface of the intake damper 8 to form urea crystals, and the exhaust gas flow guided by the choke plate 11 and the intake damper 8 act together to change the direction and flow rate of the flow and all the flow is merged into the first opening 85 of the intake damper 8.
As shown in fig. 5 and 6, the air outlet assembly 9 is a circular shape formed by a plurality of air outlet baffles 91, in this embodiment, four air outlet baffles 91 are combined into the circular air outlet assembly 9, and the outer peripheral dimension of the combined air outlet assembly 9 matches with the inner peripheral dimension of the housing 1. As shown in fig. 6, outlet baffle 91 includes a plate portion 911 and an opening portion 912, opening portion 912 is formed to extend radially outward from an outer side of one side of plate portion 911, and opening portion 912 is provided with a plurality of first through holes 916; a second arc-shaped protrusion 913 protruding outward in the air outlet direction at the other side of the plate surface portion 911 opposite to the opening portion 912, wherein the second protrusion 913 has a second arc surface 914; the inner side of the plate surface part 911 is turned up to be provided with an inward concave arc-shaped flanging 915, and the outline size of the inner surface of the arc shape is matched with the outline size of the outer surface of the central tube 10; plate portion 911 has plane portion 917 on the outer edge. As shown in fig. 3 and 5, after each air outlet baffle 91 is folded into the air outlet assembly 9, the outer edge of the second protrusion 913 of each air outlet baffle 91 is opened outwards to form a third opening 93; counted in a clockwise sequence, the second protrusion 913 of the previous air outlet baffle 91 is positioned at the inner side of the hole part 912 of the next air outlet baffle 91, an air outlet cavity 94 is formed between the second protrusion 913 and the hole part 912, and the air outlet cavity 94 is communicated with the third opening 93; the first through holes 916 of the opening portion 912 become second air outlet channels, which communicate the diversion cavity 20 and the air outlet cavity 94; a gap is formed between the outer edge of the opening part 912 and the corresponding part of the second cambered surface 914 of the second protrusion 913 to form an air outlet 92, and the air outlet 92 is used as a third air outlet channel to conduct the flow guide cavity 20 and the air outlet cavity 94; a part of the air flow in the diversion cavity 20 flows to the plurality of air outlet cavities 94 through the second air outlet channel and the third air outlet channel respectively, and flows out of the plurality of third openings 93; the inside and outside lateral surface of subassembly 9 of giving vent to anger forms the wave shape that concave protrusion is laid down, and the air current of whirl is on striking the unevenness medial surface of subassembly 9 of giving vent to anger in water conservancy diversion chamber 20, and further the whirl accelerates, improves the mixing homogeneity of ammonia for the urea liquid drop fully absorbs heat and volatilizees, has reduced the risk of urea crystallization, and the second cambered surface 914 of each baffle 91 of giving vent to anger plays the water conservancy diversion effect to the air current, guides the air current to flow direction each trompil portion 912 and gas outlet 92. As shown in fig. 3 and 5, after the outlet baffle 91 is folded into the outlet assembly 9, the flanges 915 of the outlet baffles 91 are surrounded into a circular sleeve and sleeved on the periphery of the outlet end of the central tube 10, and the plane portions 917 of the outlet baffles 91 are combined to form a ring of annular plane, the area of the annular plane is 25% -35% of the cross-sectional area of the housing 1, the third opening 93 and the second arc surface 914 are closer to the central tube 10 by the annular plane, so that the high-speed air close to the inner wall surface of the housing 1 can be forced to flow toward the third opening 93, the flow velocity distribution after the air flows out is improved, and the flow velocity distribution of the air after flowing out is more uniform.
In actual use, as shown in fig. 3, the urea nozzle in the nozzle holder 7 injects the urea injection line 71 into the mixing chamber 87; the tail gas enters the mixing cavity 87 from the first opening 85 to be mixed with the sprayed urea spraying line 71, urea liquid drops are atomized and evaporated and pyrolyzed to form mixed gas flow, the mixed gas flow enters the flow guide cavity 20 from the second opening 86, and then the mixed gas flow is discharged through the first gas outlet channel, the second gas outlet channel and the third gas outlet channel respectively.
The airflow of the utility model rotates to enter the mixing cavity 87, thereby reducing the risk of urea crystallization; the airflow in the diversion cavity 20 has three air outlet channels, after the airflow rotating in the diversion cavity 20 contacts the air outlet assembly 9, a part of the airflow flows to the air outlet cavity 94 along the second arc surface 914 and flows out from the third opening 93, a part of the airflow flows out from the plurality of first through holes 916 of the opening part 912 of the air outlet baffle 91, and the rest of a small amount of airflow flows out from the plurality of second through holes 102 of the central tube 10 and the internal channels thereof under the action of the pressure in the diversion cavity 20; the uniformity of the airflow velocity distribution is high, the crystallization risk is low, and the tail gas and the ammonia gas are mixed more uniformly.
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. For example, in other embodiments, the central hole 82 may not be formed in the air intake baffle 8, and the front end portion of the central tube 10 does not pass through the air intake baffle 8, and the front end surface thereof is directly welded and fixed to the inner side wall surface of the air intake baffle 8, so as to close the front end surface thereof.
Claims (10)
1. The utility model provides a diesel engine tail gas mixing arrangement, radially sets up air inlet baffle (8), subassembly (9) of giving vent to anger in shell (1), its characterized in that: a central tube (10) is arranged between the air inlet baffle (8) and the air outlet assembly (9) along the axial direction, and a flow guide cavity (20) is arranged in the shell (1) between the air inlet baffle (8) and the air outlet assembly (9) and outside the central tube (10);
the outer circumference outline size of the air inlet baffle (8) is matched with the inner circumference outline size of the shell (1), a first bulge (83) is arranged on the plate surface (81) of the air inlet baffle (8) in a protruding mode to form a first opening (85) and a second opening (86), and a mixing cavity (87) is formed on the inner side of the first bulge (83);
an internal channel of the central tube (10) is communicated with the air outlet end part of the shell (1), a plurality of second through holes (102) are formed in the circumferential wall surface of the central tube (10), and the second through holes (102) and the internal channel form a first air outlet channel and communicate the flow guide cavity (20) with the air outlet end part of the shell (1);
the outer circumference outline size of the air outlet component (9) is matched with the inner circumference outline size of the shell (1); the air outlet assembly (9) is provided with a plurality of opening parts (912) and second bulges (913), and the outer edges of the second bulges (913) are outwards opened to form third openings (93); the second bulge (913) is positioned on the inner side of the hole opening part (912), an air outlet cavity (94) is formed between the second bulge and the hole opening part, and the air outlet cavity (94) is communicated with the third opening (93); the opening part (912) is provided with a plurality of first through holes (916), and the first through holes (916) become a second air outlet channel, a conduction flow guide cavity (20) and an air outlet cavity (94); a gap is formed between the outer edge of the hole opening part (912) and the corresponding part of the second protrusion (913) to form an air outlet (92), and the air outlet (92) is used as a third air outlet channel, and the conduction flow guide cavity (20) and the air outlet cavity (94) are communicated.
2. The diesel exhaust mixing device of claim 1, wherein: the first bulge (83) is an arc-shaped bulge and is provided with a first arc surface (84); the second protrusion (913) is an arc-shaped protrusion having a second arc surface (914).
3. The diesel exhaust mixing device of claim 1, wherein: the air outlet component (9) is provided with a plane part on the upper side and near the outer side edge.
4. A diesel exhaust mixing device according to claim 3, wherein: the plane part is an annular plane, and the area of the annular plane is 25% -35% of the area of the cross section of the shell (1).
5. The diesel exhaust mixing device of claim 1, wherein: the center of the air outlet component (9) is provided with a sleeve which is sleeved on the periphery of the air outlet end part of the central tube (10).
6. A diesel exhaust mixing device according to any of claims 2, 3 and 5, wherein: the air outlet assembly (9) is in a round shape formed by a plurality of air outlet baffles (91) in a petal combination manner; one side of the plate surface part (911) of the air outlet baffle (91) extends outwards to form an opening part (912), a second protrusion (913) protrudes from the plate surface part (911), the second protrusion (913) is positioned at the other side part opposite to the opening part (912), an inwards concave arc-shaped flanging (915) is turned up at the inner side of the plate surface part (911), and a plane part (917) is arranged on the upper edge and the outer edge of the plate surface part (911) close to the outer edge; after the air outlet baffles (91) are folded, the air outlet baffles are counted clockwise, the second protrusions (913) of the previous air outlet baffle (91) are positioned on the inner side of the hole parts (912) of the adjacent rear air outlet baffle (91), the flanges (915) of the air outlet baffles (91) surround a circular sleeve, and the plane parts (917) of the air outlet baffles (91) are combined to form a circle of annular plane.
7. The diesel exhaust mixing device of claim 1, wherein: the front end part of the central tube (10) penetrates through the air inlet baffle (8); the central tube (10) adopts a tube with one closed end and one open end, or the front end of the central tube (10) is closed by covering a cover plate (101).
8. The diesel exhaust mixing device of claim 1, wherein: the front end face of the central tube (10) is fixed on the inner side wall face of the air inlet baffle (8), and the front end face of the central tube (10) is sealed.
9. The diesel exhaust mixing device of claim 1, wherein: a nozzle seat (7) is arranged on the shell (1) and opposite to a first opening (85) of the air inlet baffle (8), and a urea nozzle is arranged in the nozzle seat (7); a choke plate (11) is arranged on the inner wall surface of the shell (1) and positioned at the outer side of the air inlet side of the nozzle seat (7); the choke plate (11) is located obliquely above the first opening (85).
10. The diesel exhaust mixing device of claim 1, wherein: the periphery of the shell (1) is provided with a semi-cylindrical first heat-preservation component (5) and a semi-cylindrical second heat-preservation component (6), and the first heat-preservation component (5) and the second heat-preservation component (6) are in a cylindrical shape and are sleeved on the periphery of a cylinder body of the shell (1); an air outlet connecting piece (2) is arranged at the air outlet end part of the shell (1), and a pressure difference sensor seat (3) and a temperature sensor seat (4) are arranged on the wall surface of the air inlet end part.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023053920.XU CN214118294U (en) | 2020-12-17 | 2020-12-17 | Diesel engine tail gas mixing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023053920.XU CN214118294U (en) | 2020-12-17 | 2020-12-17 | Diesel engine tail gas mixing device |
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| CN214118294U true CN214118294U (en) | 2021-09-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115030803A (en) * | 2022-06-28 | 2022-09-09 | 潍柴动力股份有限公司 | Mixer and diesel engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115030803A (en) * | 2022-06-28 | 2022-09-09 | 潍柴动力股份有限公司 | Mixer and diesel engine |
| CN115030803B (en) * | 2022-06-28 | 2023-12-15 | 潍柴动力股份有限公司 | Mixer and diesel engine |
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