CN217681929U - Spiral-flow type blender and diesel engine - Google Patents
Spiral-flow type blender and diesel engine Download PDFInfo
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- CN217681929U CN217681929U CN202221614354.1U CN202221614354U CN217681929U CN 217681929 U CN217681929 U CN 217681929U CN 202221614354 U CN202221614354 U CN 202221614354U CN 217681929 U CN217681929 U CN 217681929U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The embodiment of the utility model discloses spiral-flow type blender and diesel engine, include: a mixer outer tube having a mixer sidewall such that the mixer outer tube forms a flow passage; a nozzle base is arranged on the side wall of the mixer; the front swirl plate is arranged at the first end of the outer pipe of the mixer, front swirl holes are formed in the front swirl plate, and a front swirl lug is arranged on the front swirl plate at each front swirl hole; the rear cyclone plate is arranged at the second end of the outer pipe of the mixer, rear cyclone holes are formed in the rear cyclone plate, and a rear cyclone guide plate is arranged on one side of the rear cyclone plate at the position of each rear cyclone hole; the mixing pipe is arranged in the mixer outer pipe and is positioned between the front vortex plate and the rear vortex plate, the mixing pipe is provided with a mixing pipe baffle, and the mixing pipe baffle is provided with a flow guide hole. The utility model provides a spiral-flow mixer, tail gas are through preceding whirl board entering blender in, striking mixing tube baffle simultaneously, have increased the mixed decomposition time of tail gas and urea, have avoided the urea crystallization.
Description
Technical Field
The utility model relates to a tail gas treatment equipment technical field, more specifically say, relate to a spiral-flow mixer and diesel engine.
Background
With the stricter emission standards of diesel engines, exhaust gas after-treatment technology becomes one of the necessary technical measures. Selective Catalytic Reduction (SCR) is a technology capable of removing nitrogen oxides from diesel exhaust. The SCR technology utilizes ammonia gas generated by urea hydrolysis to convert nitrogen oxides in exhaust gas into nitrogen and water under the action of a catalyst. The post-treatment technology of the engine tail gas is that the tail gas and ammonia gas are fully mixed by an SCR mixer and enter an SCR reactor to generate chemical reaction to generate nitrogen and water. In the process of after-treatment of the engine exhaust, the uniformity of mixing of the exhaust and ammonia is of great importance.
In the prior art, the SCR mixer generally consists of a cyclone tube, a cyclone tube partition, steel wool, and an outer tube. Urea is sprayed into the SCR mixer through the urea nozzle that sets up on the outer pipe wall, mixes with the tail gas that gets into the whirl pipe, and urea and tail gas mix back air current can be along the whirl direction whirl of whirl pipe, get into the SCR reactor through steel wool, because of urea is shorter with tail gas mixing time, lead to urea crystallization problem serious.
Therefore, how to improve the mixing uniformity between the urea spray and the exhaust gas and improve the urea crystallization problem becomes a technical problem to be solved urgently by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of this, an object of the present invention is to provide a spiral-flow mixer to improve the mixing uniformity between the urea spray and the exhaust gas, and improve the crystallization problem of urea.
Another object of the present invention is to provide a diesel engine having the above mentioned spiral-flow mixer.
In order to achieve the above object, the utility model provides a following technical scheme:
a cyclonic mixer comprising:
a mixer outer tube having a mixer sidewall such that the mixer outer tube forms a flow passage for a gas stream to pass through; a nozzle base for mounting a urea nozzle is arranged on the side wall of the mixer;
the front swirl plate is arranged at the first end of the mixer outer pipe, front swirl holes are formed in the front swirl plate, and front swirl lugs for forming first rotary air flow are arranged on the front swirl plate corresponding to the positions of the front swirl holes;
the rear cyclone plate is arranged at the second end of the outer pipe of the mixer, rear cyclone holes are formed in the rear cyclone plate, and a rear cyclone guide plate for forming second rotating airflow is arranged on one side of the rear cyclone plate corresponding to the position of each rear cyclone hole;
the mixing pipe is arranged in the mixer outer pipe and located between the front swirling flow plate and the rear swirling flow plate, the mixing pipe is provided with a mixing pipe baffle plate used for being collided with the first rotating airflow, and a flow guide hole is formed in the mixing pipe baffle plate.
Optionally, in the cyclone mixer, the front cyclone lugs are multiple and are uniformly distributed around the center of the front cyclone plate.
Optionally, in the spiral-flow mixer, the front spiral-flow lug is an arc-shaped structure fastened at the front spiral-flow hole, a front spiral-flow opening for allowing tail gas to enter is formed at a first end of the front spiral-flow lug, and a height of the front spiral-flow lug protruding from a plate surface of the front spiral-flow plate is gradually reduced in a direction from the first end to a second end of the front spiral-flow lug.
Optionally, in the swirl mixer, the shape of the front swirl hole is the same as the projection shape of the front swirl lug corresponding to the front swirl hole;
the projection of the front swirl lug is the projection of the front swirl lug on the plate surface of the front swirl plate.
Optionally, in the cyclone mixer, a rear cyclone center hole is formed in a center position of the rear cyclone plate.
Optionally, in the cyclone mixer, the rear cyclone guide plates are multiple and are uniformly distributed around the rear cyclone central hole.
Optionally, in the above spiral-flow mixer, the rear spiral-flow guide plate is formed by stamping the rear spiral-flow plate, a first end of the rear spiral-flow guide plate is connected to the side wall of the rear spiral-flow hole, and the rear spiral-flow guide plate is bent along the first end of the rear spiral-flow guide plate, so that a second end of the rear spiral-flow guide plate inclines and tilts in a direction away from the rear spiral-flow plate.
Optionally, in the cyclone mixer, the rear cyclone central hole is a triangular central hole; or
The rear rotational flow center hole is a rectangular center hole.
Optionally, in the cyclone mixer, the shape of the mixing pipe is the same as that of the rear cyclone central hole, and a first end of the mixing pipe is fixed to a central position of the front cyclone plate and a second end of the mixing pipe is fixed to a position corresponding to the rear cyclone central hole.
Optionally, in the cyclone mixer, the mixing tube baffle is obtained by cutting a tube wall of the mixing tube, the mixing tube baffle is bent toward a center of the mixing tube, and an air inlet is formed at a position of the tube wall of the mixing tube corresponding to each mixing tube baffle.
Optionally, in the vortex mixer, the mixing tube baffle is obtained by cutting a tube wall of the mixing tube, the mixing tube baffle bends towards a position of the mixing tube away from the center, and an air outlet is formed in a position of the tube wall of the mixing tube corresponding to each mixing tube baffle.
Optionally, in the above cyclone mixer, the corner of the mixing tube is in smooth transition in a circular arc, and a plurality of flow guiding holes are formed in the corner of the mixing tube and the mixing tube baffle.
Optionally, in the above cyclone mixer, a plurality of sensor mounting seats for mounting a temperature sensor are further provided on the side wall of the mixer outer tube and near the first end of the mixer outer tube.
A diesel engine comprising a mixer which is a cyclonic mixer as claimed in any one of the preceding claims.
The utility model provides a spiral-flow type mixer, preceding whirl hole that tail gas was seted up on through preceding whirl board is under the guide effect of preceding whirl ear to in forming first rotatory air current and entering into the mixer, striking hybrid tube baffle, urea is spouted into the mixer by the urea nozzle on the mixer lateral wall simultaneously, and the urea spraying decomposes out NH under the condition of the high temperature of tail gas in the mixer 3 ，NH 3 And the tail gas is fully mixed and then discharged from a rear rotational flow hole arranged on the rear rotational flow plate to form a second rotational air flow. The tail gas enters the mixer in the form of the first rotating airflow and impacts the baffle plate of the mixing pipe on the mixing pipe, so that the mixing and decomposing time of the tail gas and the urea is prolonged, and NH is generated 3 And the mixture is more uniformly mixed with the tail gas. When NH is generated 3 When the tail gas is discharged by the rear cyclone plate, a second rotary airflow is formed, and NH is further increased 3 The mixing uniformity with the tail gas.
Compare with the SCR blender among the prior art, tail gas gets into the spiral-flow mixer with the mode of first rotatory air current in, strikes the mixing tube baffle on the mixing tube, mixes with urea simultaneously, has increased the mixed decomposition time of tail gas and urea, the NH that produces after urea decomposes 3 The tail gas and the tail gas are discharged out of the mixer through a rear cyclone plate in a second rotary airflow mode, and NH is enabled to be discharged in the process of discharging 3 Continuously mixing with tail gas to further increase NH 3 Mixing time with tail gas. The utility model provides a spiral-flow mixer, tail gas pass through preceding whirl board entering blender in, striking hybrid tube baffle simultaneously, have increased the mixed decomposition time of tail gas and urea, are discharged by back whirl board again, have further increased NH 3 Mixing time with exhaust gas due to NH 3 The mixing time with tail gas is long, the mixing uniformity is excellent, and urea crystallization is effectively avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a perspective view of one embodiment of a cyclonic mixer according to the present invention;
FIG. 2 is a front view of the cyclonic mixer provided in the embodiment of FIG. 1;
FIG. 3 is a schematic view of a front swirler of the swirl mixer provided in the embodiment of FIG. 1;
FIG. 4 is a schematic diagram of the rear swirl plate of the swirl mixer of the embodiment of FIG. 1;
FIG. 5 is an enlarged view of the mixing tube of the cyclonic mixer provided in the embodiment of FIG. 1;
FIG. 6 is a perspective view of another embodiment of a cyclonic mixer according to an embodiment of the present invention;
FIG. 7 is a front view of the cyclonic mixer provided in the embodiment of FIG. 6;
FIG. 8 is a schematic view of the front swirler of the cyclonic mixer of FIG. 6;
FIG. 9 is a schematic diagram of the rear swirl plate of the swirl mixer of FIG. 6;
FIG. 10 is an enlarged view of the mixing tube of the cyclonic mixer provided in the embodiment of FIG. 6;
FIG. 11 is a perspective view of another embodiment of a cyclonic mixer according to an embodiment of the present invention;
FIG. 12 is a front view of the cyclonic mixer provided in the embodiment of FIG. 11;
FIG. 13 is a schematic view of the front swirler of the cyclonic mixer of FIG. 11;
FIG. 14 is a schematic diagram of the rear swirl plate of the swirl mixer of FIG. 11;
FIG. 15 is an enlarged view of the mixing tube of the cyclonic mixer provided in the embodiment of FIG. 11.
Wherein 100 is a mixer outer tube, 101 is a nozzle base, 102 is a sensor mounting seat, 103 is a connecting flange, 200 is a front swirl plate, 201 is a front swirl lug, 202 is a front swirl hole, 300 is a rear swirl plate, 301 is a rear swirl guide plate, 302 is a rear swirl hole, 303 is a rear swirl central hole, 400 is a mixing tube, 401 is a mixing tube baffle, 402 is a guide hole.
Detailed Description
The core of the utility model is to provide a spiral-flow mixer to improve the mixing uniformity between urea spraying and the waste gas, improve urea crystallization problem.
The other core of the utility model is to provide a diesel engine with the above spiral-flow mixer.
Hereinafter, embodiments will be described with reference to the drawings. The embodiments described below do not limit the scope of the invention described in the claims. Further, the entire contents of the configurations shown in the following embodiments are not limited to those necessary as a solution of the invention described in the claims.
As shown in fig. 1, the embodiment of the present invention discloses a spiral-flow mixer, which comprises a mixer outer tube 100, a front spiral-flow plate 200, a rear spiral-flow plate 300 and a mixing tube 400.
The mixer outer tube 100 has a mixer sidewall, so that the mixer outer tube 100 forms a flow passage for the gas flow to pass through, and the wall thickness of the mixer sidewall needs to be determined by those skilled in the art according to actual conditions. As can be appreciated by those skilled in the art, the thicker the mixer sidewall, the better the thermal insulation performance, and the higher the dead weight, the higher the corresponding cost; the thinner the side wall of the mixer is, the poorer the heat preservation performance is, the smaller the self weight is, the corresponding cost can be reduced, and the wall thickness of the side wall of the mixer can be designed according to the use scene of the diesel engine.
Further, as shown in fig. 2, in order to inject urea into the mixer to be mixed with the exhaust gas, a nozzle base 101 for installing a urea nozzle is provided on a side wall of the mixer. In one embodiment, the nozzle base 101 is positioned proximate to the inlet of the mixer outer tube 100. It should be noted that the close proximity to the gas inlet is beneficial to the full mixing of the tail gas and the urea, and the mixing and decomposing time of the tail gas and the urea is ensured. Of course, the nozzle base 101 may be disposed at a position far away from the air inlet of the mixer outer tube 100, and this arrangement shortens the time for mixing and decomposing the exhaust gas and the urea, and cannot ensure the exhaust gas and the urea to be fully mixed.
Further, as shown in fig. 3, the front swirl plate 200 is disposed at a first end of the mixer outer tube 100, where the first end refers to an air inlet end of the mixer outer tube 100, and the front swirl plate 200 is spaced from the air inlet end of the mixer outer tube 100 for connecting an upstream pipeline. In order to ensure the mixing time of the tail gas entering the mixer and the urea, the front swirl holes 202 are formed on the front swirl plate 200, and front swirl lugs 201 for forming a first rotating airflow are arranged on the front swirl plate 200 corresponding to the positions of the front swirl holes 202. When the exhaust gas passes through the front swirl plate 200, the exhaust gas needs to enter the mixer from the front swirl holes 202 along the front swirl lugs 201, and a first rotating airflow is formed under the guiding action of the front swirl lugs 201.
Further, as shown in fig. 4, the rear swirling plate 300 is disposed at the second end of the mixer outer tube 100, it should be noted that the second end refers to the air outlet end of the mixer outer tube 100, and a certain distance is left between the rear swirling plate 300 and the air outlet end of the mixer outer tube 100 for connecting a downstream pipeline. In order to ensure tail gas and NH 3 Mix more fully when discharging, seted up back whirl hole 302 on the back whirl plate 300, establish in one side of the back whirl plate 300 that corresponds every back whirl hole 302 positionA rear swirl guide plate 301 for forming a second swirling air flow is provided. When tail gas and NH 3 When the mixed gas passes through the rear cyclone plate 300, the mixed gas is blocked by the rear cyclone guide plate 301, and is discharged from the mixer through the rear cyclone hole 302, thereby forming a second whirling airflow.
Further, in order to ensure the mixing and decomposing time of urea and tail gas, the urea and the tail gas are mixed more sufficiently and uniformly, and urea crystallization is avoided, as shown in fig. 5, a mixing tube 400 is arranged in the outer tube 100 of the mixer, the mixing tube 400 is located between the front swirl plate 200 and the rear swirl plate 300, the mixing tube 400 is provided with a mixing tube baffle 401 for colliding with the first rotating airflow, and a diversion hole 402 is formed in the mixing tube baffle 401. The nozzle base 101 is located between the front and rear swirl plates 200 and 300 to spray urea mist through the urea nozzle onto the mixing pipe 400.
In one embodiment, when the tail gas enters from the front cyclone plate 200, a first rotational flow is formed to impact the mixing tube baffle 401 and flow out from the flow guide holes 402 formed on the mixing tube baffle 401, and the mixture is mixed with urea, and the urea is decomposed at high temperature to generate NH 3 And is sufficiently mixed with the tail gas and discharged from the rear cyclone plate 300.
The utility model provides a spiral-flow type blender, preceding whirl hole 202 that tail gas was seted up on through preceding whirl board 200 is under the guide effect of preceding whirl ear 201 to in forming first rotatory air current and entering into the blender, striking mixing tube baffle 401, in urea sprayed into the blender by the urea nozzle on the blender lateral wall simultaneously, the urea spraying decomposed out NH under the condition of the high temperature of tail gas 3 ，NH 3 And the tail gas is fully mixed and discharged through the rear swirl holes 302 arranged on the rear swirl plate 300 to form a second rotating airflow. As the tail gas enters the mixer in the form of the first rotating airflow and impacts the baffle 401 of the mixing pipe on the mixing pipe, the mixing and decomposing time of the tail gas and the urea is increased, so that NH is generated 3 And the mixture is more uniformly mixed with the tail gas. When NH is present 3 When the tail gas is discharged from the rear cyclone plate 300, a second rotary airflow is formed, and NH is further added 3 The mixing uniformity with the tail gas.
He-ShiCompared with the SCR mixer in the prior art, the tail gas enters the mixer in a first rotating airflow mode, collides with a mixing pipe baffle 401 on a mixing pipe 400 and is mixed with urea, so that the mixing and decomposing time of the tail gas and the urea is prolonged, and NH generated after the urea is decomposed 3 The tail gas and the tail gas are discharged out of the mixer through the rear cyclone plate 300 in the form of a second rotary airflow, so that NH is generated in the discharging process 3 Continuously mixing with tail gas to further increase NH 3 Mixing time with tail gas. The utility model provides a spiral-flow type mixer, tail gas pass through preceding whirl board 200 and get into the blender in, strike the hybrid tube baffle 401 simultaneously, have increased the mixed decomposition time of tail gas and urea, are discharged by back whirl board 300 again, have further increased NH 3 Mixing time with exhaust gas due to NH 3 The mixing time with tail gas is long, the mixing uniformity is excellent, and urea crystallization is effectively avoided.
Further, as shown in fig. 3 and 8, there are a plurality of front swirl lugs 201, and in an embodiment, there are 3 front swirl lugs 201, and the 3 front swirl lugs 201 are uniformly distributed around the center of the front swirl plate 200 in a clockwise direction or a counterclockwise direction. It should be noted that, the clockwise arrangement refers to that the tail gas forms a first rotating airflow rotating clockwise after entering the front swirl hole 202; the counterclockwise arrangement means that the exhaust gas forms a first rotating airflow rotating counterclockwise after entering the front swirl holes 202. The specific rotation direction needs to be determined by those skilled in the art according to actual conditions. It is within the scope of the present application to provide the rotation direction using the present embodiment. Of course, the number of the front swirl lugs 201 can also be 4, 5, etc., and it can be understood by those skilled in the art that when the size of the front swirl hole 202 is fixed, the larger the number of the front swirl lugs 201 is, the larger the flow rate of the tail gas entering the front swirl plate 200 is, so that the more fully the tail gas is mixed with the urea; the smaller the number of the front swirl ears 201, the smaller the flow of the exhaust gas entering the front swirl plate 200, and the less sufficient the exhaust gas is mixed with urea. The specific amount is determined by those skilled in the art based on the amount of exhaust emissions.
Further, as shown in fig. 3, the front swirl tab 201 is an arc-shaped structure fastened to the front swirl hole 202, and the front swirl hole 202 is a front swirl opening formed at a first end of the front swirl tab 201 for allowing exhaust gas to enter, wherein a shape of the front swirl hole 202 is the same as a projection shape of the front swirl tab 201 corresponding to the front swirl hole 202. Note that, the projection of the front swirling lug 201 is a projection of the front swirling lug 201 on the plate surface of the front swirling plate 200. In one embodiment, when the projection of the front swirl lug 201 on the plate surface of the front swirl plate 200 is arc-shaped, the shape of the front swirl hole 202 is also arc-shaped. Of course, the projection of the front swirl lug 201 on the plate surface of the front swirl plate 200 may also be in other shapes, such as a rectangle. The present embodiment preferably has an arc shape, which greatly reduces the airflow resistance compared with other shapes, so that the exhaust gas can enter the front swirl hole 202 more smoothly.
Further, in order to reduce the resistance when the exhaust gas enters the front swirl holes 202, the height of the plate surface of the front swirl lugs 201 protruding from the front swirl plate 200 is gradually reduced to a corresponding position in the direction from the first end to the second end of the front swirl lugs 201, which is to be noted that the corresponding position may be equal to the front swirl plate 200 or may be a corresponding distance from the front swirl plate 200.
Further, as shown in fig. 4 and 14, a rear swirling center hole 303 for exhausting the exhaust gas is formed in the center of the rear swirling plate 300. In one embodiment, the rear swirl center hole 303 is a triangular center hole, and the plurality of rear swirl guides 301 are uniformly arranged around the triangular rear swirl center hole 303. In another embodiment, the rear swirl center hole 303 is a rectangular center hole, and the plurality of rear swirl guides 301 are uniformly arranged around the rectangular rear swirl center hole 303. Of course, the post-swirl central hole 303 may have other shapes, such as a circular shape, and no matter which shape of the post-swirl central hole 303 is adopted, the tail gas and the NH are ensured 3 The mixed gas can be smoothly discharged, and the back pressure of the system is reduced.
Further, the rear swirl guide plate 301 is formed by punching the rear swirl plate 300 at the position of the rear swirl hole 302, and for convenience of understanding, the end of the rear swirl guide plate 301 connected to the rear swirl plate 300 is referred to as a first end, and the end of the rear swirl guide plate 301 tilted is referred to as a second end. Wherein, the first end of back whirl baffle 301 is connected with the lateral wall of back whirl hole 302, and back whirl baffle 301 buckles along the first end of back whirl baffle 301 to make the second end of back whirl baffle 301 incline the perk to the direction of keeping away from back whirl baffle 300, the perk direction of the second end of back whirl baffle 301 can point to hybrid tube 400, of course, the perk direction of the second end of back whirl baffle 301 also can deviate from hybrid tube 400. The specific tilting direction of the second end of the rear vortex guide plate 301 needs to be determined by those skilled in the art according to the vortex direction of the front vortex plate 200.
When the front cyclone plate 200 swirls clockwise, the second end of the rear cyclone guide plate 301 tilts in the direction pointing to the mixing pipe 400; when the front cyclone plate 200 swirls counterclockwise, the second end of the rear cyclone guide plate 301 tilts away from the mixing tube 400. It should be noted that the sidewall of the rear swirl holes 302 refers to a side of the rear swirl holes 302 perpendicular to the outer edge of the rear swirl plate 300.
In an embodiment, the first ends of the rear cyclone guiding plates 301 and the side wall connecting the rear cyclone holes 302 may be the same side or different sides, and when the side wall is the same side, the tail gas and the NH are mixed 3 The mixed gas is discharged in a clockwise or counterclockwise rotation; when they are on different sides, the tail gas is NH 3 The mixed gas is discharged in a cross turbulent flow. In this embodiment, the first ends of the plurality of rear swirl guide plates 301 are preferably located on the same side as the side wall connected to the rear swirl holes 302.
Further, as shown in fig. 9 and 10, the shape of the mixing pipe 400 is the same as that of the rear swirl central hole 303, and for convenience of understanding, the end of the mixing pipe 400 at the mixer inlet is referred to as a first end, the end of the mixing pipe 400 at the mixer outlet is referred to as a second end, the first end of the mixing pipe 400 is fixed to the center of the front swirl plate 200, and the second end of the mixing pipe 400 is fixed to a position corresponding to the rear swirl central hole 303. It should be noted that the fact that the second end of the mixing tube 400 is fixed at the position corresponding to the rear swirling flow center hole 303 means that the size of the mixing tube 400 is not smaller than the size of the rear swirling flow center hole 303, and the shape of the mixing tube 400 is the same as that of the rear swirling flow center hole 303, which ensures that the exhaust gas can be smoothly discharged from the rear swirling flow center hole 303.
Further, as shown in fig. 5 and 15, in a specific embodiment, the mixing tube baffles 401 are cut from the tube wall of the mixing tube 400, the mixing tube baffles 401 are bent toward the center of the mixing tube 400, and an air inlet is formed at the position of the tube wall of the mixing tube 400 corresponding to each mixing tube baffle 401. When the tail gas passes through the front swirl holes 202 formed in the front swirl plate 200 to form a first rotating airflow, the first rotating airflow enters the mixer, and the tail gas enters the air inlet formed in the mixing pipe 400, collides with the mixing pipe baffle 401, is mixed with urea and is decomposed, and is discharged from the rear swirl central hole 303 and the rear swirl holes 302 in the rear swirl plate 300.
In another embodiment, as shown in fig. 10, the mixing tube baffles 401 are cut from the tube wall of the mixing tube 400, the mixing tube baffles 401 are bent away from the center of the mixing tube 400, and air outlets are formed at the positions of the tube wall of the mixing tube 400 corresponding to each mixing tube baffle 401. When the tail gas passes through the front swirl holes 202 formed in the front swirl plate 200 to form a first swirling flow, the first swirling flow enters the mixer, collides with the mixing tube baffle 401, flows out from the gas outlet formed in the mixing tube 400, is mixed with urea to be decomposed, and is discharged from the rear swirl central hole 303 and the rear swirl holes 302 of the rear swirl plate 300.
It should be noted that, as long as the above embodiment is adopted, the mixed decomposition time of urea and tail gas can be increased, so that urea and tail gas are mixed more sufficiently, urea crystallization is avoided, and tail gas and NH are mixed 3 The mixed gas of (2) is more uniform when being discharged.
Further, as shown in fig. 5 and 15, in a specific embodiment, in order to ensure that the air flow can pass through the mixing tube 400 from multiple angles, when the mixing tube 400 is triangular or rectangular, the corners of the mixing tube 400 are smoothly transited in a circular arc to reduce the air flow resistance, and a plurality of uniformly distributed guiding holes 402 are opened on the circular arc surface of the corner of the mixing tube 400 and on the mixing tube baffle 401.
Further, a plurality of sensor mounting seats 102 for mounting temperature sensors are further arranged on the side wall of the outer mixer tube 100 and near the first end of the outer mixer tube 100, and a connecting flange 103 is further arranged on one side near the sensor mounting seats 102, wherein the connecting flange 103 protrudes out of the outer wall of the outer mixer tube 100 and is used for connecting with upstream equipment.
The embodiment of the utility model provides a diesel engine is still disclosed, including the blender, this blender is the spiral-flow type blender as above embodiment discloses, consequently has all technological effects of above-mentioned spiral-flow type blender concurrently, and this paper is no longer repeated here.
The terms "first" and "second," and the like in the description and claims of the present invention and the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not set forth for a listed step or element but may include steps or elements not listed.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (14)
1. A cyclonic mixer, comprising:
a mixer outer tube (100) having a mixer sidewall such that the mixer outer tube (100) forms a flow passage for a gas flow to pass through; a nozzle base (101) for mounting a urea nozzle is arranged on the side wall of the mixer;
the front swirl plate (200) is arranged at the first end of the mixer outer pipe (100), a front swirl hole (202) is formed in the front swirl plate (200), and a front swirl lug (201) for forming first rotary air flow is arranged on the front swirl plate (200) corresponding to each front swirl hole (202);
the rear swirl plate (300) is arranged at the second end of the mixer outer tube (100), rear swirl holes (302) are formed in the rear swirl plate (300), and a rear swirl guide plate (301) for forming second rotating airflow is arranged on one side of the rear swirl plate (300) corresponding to the position of each rear swirl hole (302);
the mixer comprises a mixer outer pipe (100), a mixing pipe (400) and a mixing pipe baffle (401), wherein the mixing pipe (400) is arranged in the mixer outer pipe (100) and is positioned between a front swirl plate (200) and a rear swirl plate (300), the mixing pipe (400) is provided with the mixing pipe baffle (401) which is used for impacting the first rotating airflow, and the mixing pipe baffle (401) is provided with a diversion hole (402).
2. A cyclonic mixer as claimed in claim 1, wherein the forward swirl ears (201) are plural and the forward swirl ears (201) are equispaced about the centre of the forward swirl plate (200).
3. A rotational flow type mixer as claimed in claim 2, wherein the front rotational flow lug (201) is an arc-shaped structure fastened to the front rotational flow hole (202), and a front rotational flow opening for allowing exhaust gas to enter is formed at a first end of the front rotational flow lug (201), and a height of the front rotational flow lug (201) protruding from a plate surface of the front rotational flow plate (200) is gradually reduced in a direction from the first end to a second end of the front rotational flow lug (201).
4. A cyclonic mixer as claimed in claim 3, wherein the shape of the forward swirl holes (202) is the same as the projected shape of the forward swirl ears (201) corresponding to the forward swirl holes (202);
the projection of the front swirl lug (201) is the projection of the front swirl lug (201) on the plate surface of the front swirl plate (200).
5. A cyclonic mixer as claimed in claim 1, wherein the rear cyclone plate (300) is provided with a rear cyclone central opening (303) at a central location.
6. A cyclonic mixer as claimed in claim 5, wherein the rear swirl guide plate (301) is plural and the rear swirl guide plates (301) are equispaced around the rear swirl central aperture (303).
7. A swirl mixer according to claim 6, characterised in that the rear swirl guide plate (301) is stamped from the rear swirl plate (300), that a first end of the rear swirl guide plate (301) is connected to a side wall of the rear swirl hole (302), and that the rear swirl guide plate (301) is bent over along the first end of the rear swirl guide plate (301) such that a second end of the rear swirl guide plate (301) tips up obliquely away from the rear swirl plate (300).
8. A cyclonic mixer as claimed in claim 5, wherein the post-swirl central aperture (303) is a triangular central aperture; or
The rear rotational flow center hole (303) is a rectangular center hole.
9. A swirl mixer according to claim 8, wherein the mixing tube (400) has the same shape as the rear swirl central bore (303) and a first end of the mixing tube (400) is fixed to the front swirl plate (200) at a central position and a second end of the mixing tube (400) is fixed to a position corresponding to the rear swirl central bore (303).
10. A cyclonic mixer according to claim 1, wherein the mixing tube baffle (401) is cut from the wall of the mixing tube (400), the mixing tube baffle (401) is bent towards the centre of the mixing tube (400), and an air inlet is formed in the wall of the mixing tube (400) at a position corresponding to each mixing tube baffle (401).
11. A swirl mixer according to claim 1, characterised in that the mixing tube baffle (401) is cut from the tube wall of the mixing tube (400), that the mixing tube baffle (401) is bent towards the centre of the mixing tube (400) away from it, and that an air outlet is formed in the tube wall of the mixing tube (400) at the location corresponding to each mixing tube baffle (401).
12. A cyclonic mixer as claimed in claim 9, wherein the corners of the mixing tube (400) are smoothly rounded and a plurality of baffle holes (402) are provided in the corners of the mixing tube (400) and the mixing tube baffle (401).
13. A cyclonic mixer as claimed in claim 1, wherein a plurality of sensor mounts (102) are provided on the side wall of the outer mixer tube (100) adjacent the first end of the outer mixer tube (100) for mounting temperature sensors.
14. A diesel engine comprising a mixer, wherein the mixer is a cyclonic mixer as claimed in any one of claims 1 to 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221614354.1U CN217681929U (en) | 2022-06-24 | 2022-06-24 | Spiral-flow type blender and diesel engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221614354.1U CN217681929U (en) | 2022-06-24 | 2022-06-24 | Spiral-flow type blender and diesel engine |
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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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Cited By (2)
| 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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