WO2023000397A1 - Sleeve shunt-type urea mixing device - Google Patents

Sleeve shunt-type urea mixing device Download PDF

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Publication number
WO2023000397A1
WO2023000397A1 PCT/CN2021/111075 CN2021111075W WO2023000397A1 WO 2023000397 A1 WO2023000397 A1 WO 2023000397A1 CN 2021111075 W CN2021111075 W CN 2021111075W WO 2023000397 A1 WO2023000397 A1 WO 2023000397A1
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WO
WIPO (PCT)
Prior art keywords
swirl
end cover
casing
swirl tube
mixing device
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PCT/CN2021/111075
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French (fr)
Chinese (zh)
Inventor
陈增响
陈正国
张旭
付细平
徐超
徐文清
徐东
易军
周稳超
陆超俊
Original Assignee
无锡威孚力达催化净化器有限责任公司
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Publication of WO2023000397A1 publication Critical patent/WO2023000397A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/08—Adding substances to exhaust gases with prior mixing of the substances with a gas, e.g. air
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Definitions

  • the invention belongs to the technical field of post-treatment of diesel engine tail gas, and in particular relates to a casing split-flow urea mixing device.
  • the U-shaped post-processor is a key component of the commercial vehicle post-treatment system in the National VI emission stage, and its urea mixing device is still immature.
  • common mixing units of urea mixers mostly use fin structures or fiber units to realize crushing and splitting of urea, and meanwhile use orifice plate or orifice tube structures to realize urea mixing.
  • the fin structure mostly adopts a large fin structure, which has limited effect on the crushing and shunting of urea.
  • swirling flow and double-layer hole tubes have also been used to realize the crushing and splitting of urea and the mixing before SCR.
  • the present invention provides a casing split-flow urea mixing device.
  • the technical problem to be solved is how to improve the splitting effect and crushing effect of urea, thereby increasing the decomposition rate of urea and reducing the urea risk of crystallization.
  • a casing split-flow urea mixing device comprising a rear clamshell end cover and a front clamshell end cover connected to each other, the rear clamshell end cover and the front clamshell end cover form a hollow cavity inside, the
  • the front clamshell end cover has an inlet and an outlet, the inlet and the outlet communicate with the inside of the rear clamshell end cover, and also includes a mixing assembly located in the cavity, the mixing assembly includes a nozzle base, a rotary A flow tube assembly, a partition, a deflector, and a swirl plate, one end of the nozzle base is fixedly connected to one end of the swirl tube assembly, and the other end of the nozzle base is fixedly connected to the rear clam shell end cover And communicate with the external urea nozzle; the center of the partition has a through hole, and the partition is connected with the swirl tube assembly through the through hole; the deflector is located at the swirl tube assembly On the side away from the nozzle base, the deflector is fixedly connected to the rear clamshell
  • the swirl tube assembly includes an outer swirl tube, an inner window sleeve and a support cover, the inner window sleeve is located inside the outer swirl tube, and the inner window
  • the casing is fixedly connected to the outer swirl tube through the support plug, the support plug is located at the end of the outer swirl tube away from the nozzle base, and the support plug is connected to the outer swirl tube.
  • the swirl tubes are perpendicular to each other.
  • the outer swirl tube is coaxial with the inner window sleeve, and the ratio of the inner diameter of the outer swirl tube to the outer diameter of the inner window sleeve is 6/5-3/ 2.
  • the swirl fins are evenly spaced along the central axis of the outer swirl tube;
  • the peripheral wall of the outlet portion of the outer swirl tube has a number of through holes, and the small holes are evenly spaced along the central axis of the outer swirl tube;
  • the inlet portion of the outer swirl tube is the The part between the nozzle base and the partition, and the outlet of the outer swirl tube is the part between the support blocking cover and the partition.
  • the length of a row of the swirl fins close to the nozzle base is longer than that of the other row, and the length direction of the swirl fins is arranged along the axial direction of the outer swirl tube.
  • the peripheral wall of the inner window casing has several rows of through long holes, the long holes are evenly spaced along the central axis of the inner window casing, and the length direction of the long holes is along the Describe the axial setting of the inner window casing.
  • the supporting feet are evenly spaced along the central axis of the supporting blocking cover.
  • the window casing is fixedly connected with the outer swirl tube; the supporting blocking cover also has a number of through holes, and the through holes are evenly spaced along the central axis of the supporting blocking cover.
  • the support blocking cover is close to the center of the swirl plate.
  • the swirl plate is coaxial with the outlet;
  • the center of the swirl plate has a through conical hole, and the conical hole protrudes in a direction away from the rear clamshell end cover, and the diameter gradually become smaller;
  • the swirl plate also has a circle of open notches, the notches are located on the outer periphery of the tapered hole, and the notches are evenly spaced along the central axis of the swirl plate.
  • the side of the deflector plate close to the swirl plate is inclined downward, and the rear clamshell end cover also has two through-flow splitter grooves, and the two splitter grooves are arranged symmetrically, so that The flow distribution groove is located on the side of the deflector away from the swirl plate, and the flow distribution groove is arranged correspondingly to the flow deflector.
  • the casing diversion type urea mixing device provided by the present invention greatly improves the splitting effect and crushing effect of urea, further improves the decomposition rate of urea and reduces the risk of urea crystallization.
  • Fig. 1 is an axonometric view of a casing shunt type urea mixing device provided by an exemplary embodiment of the present invention
  • Fig. 2 is an exploded schematic diagram of a casing split type urea mixing device provided by an exemplary embodiment of the present invention
  • Fig. 3 is an exploded schematic diagram of a mixing assembly of a sleeve split type urea mixing device provided by an exemplary embodiment of the present invention
  • Fig. 4 is a schematic diagram of a swirl tube assembly of a sleeve split type urea mixing device provided by an exemplary embodiment of the present invention
  • Fig. 5 is a schematic diagram of a swirl tube assembly of a sleeve split type urea mixing device provided by an exemplary embodiment of the present invention
  • Fig. 6 is a schematic diagram of the position of the mixing chamber of a casing split type urea mixing device provided by an exemplary embodiment of the present invention.
  • Fig. 7 is an enlarged view at A of Fig. 6 of a sleeve split type urea mixing device provided by an exemplary embodiment of the present invention
  • Rear clamshell end cover 11. Splitter; 2. Front clamshell end cover; 21. Inlet; 22. Outlet; 3. Mixing assembly; 31. Nozzle base; 32. Swirl tube assembly; 321 , outer swirl tube; 3211, swirl fin; 3212, small hole; 322, inner window casing; 3221, long hole; 323, support plug cover; 324, support foot; 33, partition; 34, Deflector; 35, swirl plate; 351, tapered hole; 352, notch; 4, first mixing chamber; 5, second mixing chamber; 6, third mixing chamber; 7, fourth mixing chamber.
  • Fig. 1 it is a casing shunt type urea mixing device, which includes a rear clamshell end cover 1 and a front clamshell end cover 2 connected to each other, and the rear clamshell end cover 1 and the front clamshell end cover 2 form an internal hollow
  • the connection method between the rear clamshell end cover 1 and the front clamshell end cover 2 includes but not limited to one of welding, riveting, gluing and bolting; as shown in Figure 2, the front A circular inlet 21 and an outlet 22 are provided on the clamshell end cover 2, and the inlet 21 and the outlet 22 communicate with the interior of the rear clamshell end cover 1.
  • the opening methods of the inlet 21 and the outlet 22 include but are not limited to One of laser cutting, plasma cutting, and milling.
  • mixing assembly 3 As shown in Figure 2, also comprise the mixing assembly 3 that is positioned at the cavity, mixing assembly 3 comprises nozzle base 31, swirl tube assembly 32, dividing plate 33, deflector 34 and swirl plate 35, one end of nozzle base 31 and One end of the swirl tube assembly 32 is fixedly connected.
  • the connection method between one end of the nozzle base 31 and one end of the swirl tube assembly 32 includes but is not limited to one of welding, riveting, gluing and bolting; the nozzle The other end of the base 31 is fixedly connected to the rear clam shell end cover 1 and communicated with the external urea nozzle, which is used to spray urea into the above-mentioned cavity and mix with the exhaust gas.
  • connection method of the end cover 1 includes but not limited to one of welding, riveting, gluing and bolt connection; the nozzle base 31 is located at the end of the rear clam shell end cover 1 close to the inlet 21; the center of the partition 33 has a through hole, The partition 33 is socketed and connected with the swirl tube assembly 32 through the through hole.
  • connection method between the partition 33 and the swirl tube assembly 32 includes but not limited to one of welding, riveting, gluing and bolting.
  • the partition plate 33 is located in the middle of the swirl tube assembly 32, and the outer peripheral wall of the partition plate 33 fits tightly with the inner peripheral wall of the cavity; the deflector 34 is located on the side of the swirl tube assembly 32 away from the nozzle base 31, and the guide
  • the baffle 34 is fixedly connected with the rear clamshell end cover 1.
  • the connection method between the baffle 34 and the rear clamshell end cover 1 includes but not limited to one of welding, riveting, gluing and bolting;
  • the deflector 34 is located at the end close to the outlet 22 in the rear clamshell end cover 1; the swirl plate 35 is fixedly connected with the outlet 22, and the outer peripheral wall of the swirl plate 35 is attached to the inner peripheral wall of the outlet 22.
  • the way of connecting the swirl plate 35 to the outlet 22 includes but not limited to one of welding, riveting, gluing and bolting.
  • the inlet 21 and the outlet 22 are away from the side of the rear clam shell end cover 1, and flange flanges are respectively installed along the circumferential direction of the inlet 21 and the outlet 22, which are used to connect the DPF (diesel particulate filter) respectively.
  • Diesel Particulate Filter and SCR (Selective Catalytic Reduction).
  • the exhaust gas flow when the exhaust gas flow enters the mixing device, it first enters from the inlet 21, and forms a strong swirling air flow through the swirl tube assembly 32 and enters the inside of the swirl tube assembly 32.
  • the urea flows from the nozzle base 31 Spray into the inside of the swirl tube assembly 32 to fully and evenly mix with the exhaust gas; then, it impacts on the deflector 34 along the direction of the air flow.
  • the setting of the deflector 34 is mainly to prevent urea
  • the bottom near the outlet 22 is hoarded, resulting in crystallization and affecting the mixing uniformity of urea and exhaust gas; finally, it is discharged from the outlet 22 after being mixed again by the swirl plate 35 .
  • the swirl tube assembly 32 includes an outer swirl tube 321 , an inner window sleeve 322 and a support blocking cover 323 , and the inner window sleeve 322 is located in the outer swirl tube. Inside the tube 321, the inner window sleeve 322 is fixedly connected with the outer swirl tube 321 through the support plug 323.
  • the inner window sleeve 322, the support plug 323 and the outer swirl tube 321 The connection method includes but is not limited to one of welding, riveting, gluing and bolt connection; the support blocking cover 323 is located at the end of the outer swirl tube 321 away from the nozzle base 31, that is, the end near the outlet 22; the support blocking cover 323 and The outer swirl tubes 321 are perpendicular to each other.
  • the swirl tube assembly 32 adopts a sleeve method, which enhances the swirl strength between the outer swirl tube 321 and the inner window sleeve 322, and prevents urea from accumulating inside the swirl tube assembly 32. Urea crystallization.
  • the outer swirl tube 321 is coaxial with the inner window sleeve 322, and the ratio of the inner diameter of the outer swirl tube 321 to the outer diameter of the inner window sleeve 322 is 6/5 ⁇ 3/2.
  • the ratio of the inner diameter of the outer swirl tube 321 to the outer diameter of the inner window sleeve 322 is 6/5
  • the ratio of the inner diameter of the outer swirl tube 321 to the outer diameter of the inner window sleeve 322 is 6/5.
  • the swirl mixing effect in the range of 6/5 to 3/2 has little difference and can be arranged flexibly, but if it is less than 6/5 or greater than 3/2, the swirl mixing effect will decrease.
  • FIG. 3 there are two rows of open swirl fins 3211 on the peripheral wall of the inlet portion of the outer swirl tube 321, which are used to allow exhaust gas to enter the outer swirl at high speed.
  • the flow tube 321 is mixed with urea, and the rotating swirl fins 3211 are evenly spaced along the central axis of the outer swirl tube 321.
  • connection method between the swirl fins 3211 and the outer swirl tube 321 includes But not limited to one of machining center machining and one-piece molding; the peripheral wall of the outlet of the outer swirl tube 321 has a number of through holes 3212, and the small holes 3212 are evenly spaced along the central axis of the outer swirl tube 321 Setting, optional, the small hole 3212 is opened or stamped by the machining center; the inlet of the outer swirl tube 321 is the part between the nozzle base 31 and the partition 33, and the outlet of the outer swirl tube 321 is The part between the blocking cover 323 and the partition plate 33 is supported.
  • the arrangement of the swirl fins 3211 strengthens the swirling effect of the urea spraying position and the swirling effect of the urea cone spraying wall landing point;
  • the arrangement of the small holes 3212 improves the splitting and crushing effect of urea, thereby improving the mixing efficiency of urea and exhaust gas.
  • the length of the row of swirl fins 3211 close to the nozzle base 31 is greater than the length of the other row, and the length direction of the swirl fins 3211 is along the direction of the outer swirl tube 321 axial setting.
  • the outer swirl tube 321 adopts two-stage swirl fins 3211, and the row of swirl fins 3211 near the nozzle base 31 is longer, mainly to strengthen the swirl effect of the urea spraying position, and the other row of swirl fins 3211 is longer.
  • the flow fins 3211 are relatively short, and are used to enhance the swirl effect at the impact point of the urea cone spray.
  • elongated holes 3221 there are several rows of elongated holes 3221 penetrating through the peripheral wall of the inward opening casing 322.
  • the elongated holes 3221 are racetrack-shaped.
  • the elongated holes 3221 are processed The center is opened or formed by stamping; the long holes 3221 are evenly spaced along the central axis of the inner window casing 322 , and the length direction of the long holes 3221 is arranged along the axial direction of the inner window casing 322 .
  • the arrangement of the elongated hole 3221 improves the fluidity of the air flow between the outer swirl tube 321 and the inner window casing 322, and realizes the rapid shunting of urea; Forms a good crushing action.
  • FIG. 4 and Figure 5 there are a plurality of support legs 324 on the peripheral wall of the support block cover 323, and the support legs 324 are evenly spaced along the central axis of the support block cover 323 to support the block cover 323 connects the inner window casing 322 and the outer swirl tube 321 through the supporting feet 324;
  • the supporting blocking cover 323 is also provided with a number of penetrating through holes, and the through holes are evenly spaced along the central axis of the supporting blocking cover 323.
  • only the supporting feet 324 may be used to securely connect the inner window casing 322 and the outer swirl tube 321 .
  • the through hole on the support plug 323 further strengthens the crushing effect on urea.
  • the support plug 323 is close to the center of the swirl plate 35, so that urea can be directly exported from the center of the swirl plate 35, and the SCR (Selective Catalytic Reduction) can be improved. Ammonia gas distribution uniformity on the front face.
  • the swirl plate 35 is coaxial with the outlet 22; the center of the swirl plate 35 has a through conical hole 351, and the conical hole 351 is along the direction away from the rear clamshell end cover 1. The direction protrudes, and the diameter gradually becomes smaller.
  • the connection method between the tapered hole 351 and the swirl plate 35 includes but not limited to one of welding, riveting, gluing and integral molding;
  • the notch 352 is cat-ear-shaped.
  • the notch 352 is located on the outer periphery of the tapered hole 351.
  • the notch 352 is evenly spaced along the central axis of the swirl plate 35.
  • the The way of connecting the notch 352 and the swirl plate 35 includes but not limited to one of welding, riveting, gluing and integral molding.
  • the setting of the tapered hole 351 ensures that the airflow is mainly discharged from the central position of the swirl plate 35; at the same time, the notches 352 are evenly distributed around the swirl plate 35, which can form a strong swirling airflow through the passing airflow and improve In order to achieve a further mixing effect on urea particles, it also ensures the efficiency of urea decomposition into ammonia and the uniformity of ammonia distribution on the front face of SCR (Selective Catalytic Reduction).
  • the side of the deflector 34 close to the swirl plate 35 is inclined downward, so as to facilitate the discharge of urea toward the outlet 22; as shown in Figure 6 and Figure 7
  • the rear clamshell end cover 1 is also provided with two through-flow splitter grooves 11, and the two splitter grooves 11 are arranged symmetrically.
  • the flow plate 34 is provided correspondingly.
  • the distributing groove 11 is set so that part of the air flow flows into the bottom of the deflector 34 from both sides of the rear end of the deflector 34 , thereby purging the urea under the deflector 34 .
  • four mixing chambers are formed between the front clam shell end cover 1, the rear clam shell end cover 2 and the mixing assembly 3, which are respectively:
  • the first mixing chamber 4 is composed of the front clam shell end cover 1, the upper part of the rear clam shell end cover 2, the upper part of the swirl tube assembly 32 and a partition 33;
  • the second mixing chamber 5 is composed of an outer swirl tube 321 and an inner window casing 322;
  • the third mixing chamber 6 is composed of an inner window casing 322 and a supporting blocking cover 323;
  • the fourth mixing chamber 7 is composed of the front clamshell end cover 1 , the lower part of the rear clamshell end cover 2 , the lower part of the swirl tube assembly 32 , the partition 33 , the deflector 34 and the swirl plate 35 .
  • a casing split type urea mixing device described in any of the above-mentioned embodiments is used, and the working of the device Principle, including the following steps:
  • Step 1 when the exhaust gas flow enters the mixing device, it first enters the first mixing chamber 4, and forms a strong swirling airflow through the swirl fins 3211 on the outer swirl tube 321 to enter the second mixing chamber 5 and the third mixing chamber
  • urea is sprayed into the third mixing chamber 6 from the position of the nozzle base 31, and the crushing and shunting of urea is completed through the inner window sleeve 322, and the long hole 3221 on the inner window sleeve 322 has a larger opening , urea is not easy to accumulate in the middle of the opening, so that the urea can be evenly divided into the second mixing chamber 5, and then it is easier to be taken away by the strong swirl in the second mixing chamber 5;
  • the urea on the inner window casing 322 on the wall can have a longer mixing distance, and finally complete further crushing and shunting on the supporting plug 323;
  • Step 2 the exhaust gas and urea flowing out from the second mixing chamber 5 and the third mixing chamber 6 will enter the fourth mixing chamber 7, and impact on the deflector 34, the deflector 34 is arranged obliquely downward, so that The urea is convenient to discharge toward the direction of the outlet 22; at the same time, the setting of the two splitter grooves 11 allows part of the air flow to flow into the bottom of the deflector 34 from both sides of the rear end of the deflector 34, and sweep the urea below the deflector;
  • Step 3 the exhaust gas and urea discharged from the fourth mixing chamber 7 pass through the swirl plate 35 to complete the final mixing of urea and ammonia decomposed from the urea.
  • the tapered hole 351 in the middle of the swirl plate 35 ensures that the airflow mainly flows from The central position of the swirl plate 35 is discharged, and the notch 352 on the swirl plate 35 can form a strong swirling air flow through the passing airflow, which has the effect of further mixing the urea particles, and also ensures the efficiency and efficiency of urea decomposition into ammonia gas.
  • the shunt-type urea mixing device provided by the present invention greatly improves the shunting effect and crushing effect of urea through the setting of four mixing chambers, thereby improving the decomposition rate and reduces the risk of crystallization of urea.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

Disclosed in the present invention is a sleeve shunt-type urea mixing device, comprising a rear clamshell end cover and a front clamshell end cover, which are connected with each other. The rear clamshell end cover and the front clamshell end cover form an internal hollow cavity. The front clamshell end cover has provided thereon an inlet and an outlet. The sleeve shunt-type urea mixing device also comprises a mixing assembly located in the cavity. The mixing assembly comprises a nozzle base, a swirl tube assembly, a partition plate, a flow guide plate and a swirl plate. One end of the nozzle base is fixedly connected to one end of the swirl tube assembly, and the other end of the nozzle base is fixedly connected to the rear clamshell end cover and is in communication with an external urea nozzle. The partition plate is sleevedly connected to the swirl tube assembly. The flow guide plate is located at a side of the swirl tube assembly distant from the nozzle base, and the flow guide plate is fixedly connected to the rear clamshell end cover. The swirl plate is fixedly connected to the outlet. The nozzle base is located at an end of the rear clamshell end cover close to the inlet. The flow guide plate is located at an end of the rear clamshell end cover close to the outlet. The device improves urea shunting effects and crushing results, thereby increasing the decomposition rate of urea and reducing the risk of crystallization.

Description

一种套管分流式尿素混合装置A casing split type urea mixing device 技术领域technical field
本发明属于柴油机尾气后处理技术领域，具体涉及一种套管分流式尿素混合装置。The invention belongs to the technical field of post-treatment of diesel engine tail gas, and in particular relates to a casing split-flow urea mixing device.
背景技术Background technique
在SCR(选择性催化还原Selective Catalytic Reduction)***应用技术中，如何将喷入的尿素和发动机废气进行均匀混合并完成对尿素的二次破碎、减少尿素在混合器位置的结晶风险是整个开发过程中的关键。U型后处理器作为国六排放阶段商用车后处理***的关键部件，其尿素混合装置尚不成熟。In the SCR (Selective Catalytic Reduction) system application technology, how to uniformly mix the injected urea and engine exhaust gas and complete the secondary crushing of urea and reduce the crystallization risk of urea at the mixer position is the whole development process. key in . The U-shaped post-processor is a key component of the commercial vehicle post-treatment system in the National VI emission stage, and its urea mixing device is still immature.
相关技术中，尿素混合器常见的混合单元多使用翅片结构或者纤维单元实现尿素的破碎和分流，同时采用孔板或者孔管结构实现尿素的混合。但是，翅片结构由于微型翅片加工难度大等问题多采用大翅片结构，对尿素的破碎及分流作用有限。近年来，也有采用旋流和双层孔管来实现尿素的破碎分流以及在SCR前的混合作用。但是，由于旋流结构对尿素的破碎能力有限，孔管虽有分流作用，但也容易堵塞小孔而发生严重的尿素结晶，导致尿素的分流和分解难以快速完成。In related technologies, common mixing units of urea mixers mostly use fin structures or fiber units to realize crushing and splitting of urea, and meanwhile use orifice plate or orifice tube structures to realize urea mixing. However, due to the difficulty of micro-fin processing and other problems, the fin structure mostly adopts a large fin structure, which has limited effect on the crushing and shunting of urea. In recent years, swirling flow and double-layer hole tubes have also been used to realize the crushing and splitting of urea and the mixing before SCR. However, due to the limited ability of the cyclone structure to crush urea, although the orifice tube has a shunting effect, it is also easy to block the small holes and cause serious urea crystallization, which makes it difficult to quickly complete the shunting and decomposition of urea.
发明内容Contents of the invention
发明目的：为了克服现有技术中存在的不足，本发明提供一种套管分流式尿素混合装置，所要解决的技术问题是如何提升尿素的分流作用和破碎效果，进而提高尿素分解速率并降低尿素结晶的风险。Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a casing split-flow urea mixing device. The technical problem to be solved is how to improve the splitting effect and crushing effect of urea, thereby increasing the decomposition rate of urea and reducing the urea risk of crystallization.
技术方案：为实现上述目的，本发明采用的技术方案为：Technical scheme: in order to achieve the above object, the technical scheme adopted in the present invention is:
一种套管分流式尿素混合装置，包括相互连接的后蚌壳端盖以及前蚌壳端盖，所述后蚌壳端盖与所述前蚌壳端盖形成内部中空的腔体，所述前蚌壳端盖上具有进口以及出口，所述进口以及所述出口与所述后蚌壳端盖的内部连通，还包括位于所述腔体内的混合组件，所述混合组件包括喷嘴底座、旋流管组件、隔板、导流板以及旋流板，所述喷嘴底座的一端与所述旋流管组件的一端固连，所述喷嘴底座的另一端与所述后蚌壳端盖固连且与外部的尿素喷嘴连通；所述隔板的中心具有一通孔，所述隔板通过所述通孔与所述旋流管组件套接连接；所述导流板位于所述旋流管组件远离所述喷嘴底座的一侧，所述导流板与所述后蚌壳端盖固连；所述旋流板与所述出口匹配固连；所述喷嘴底座位于所述后蚌壳端盖内靠近所述进口的一端；所述导流板位于所述后蚌壳端盖内靠近所述出口的一端；所述隔板位于所述旋流管组件的中部，所述隔板的外周壁与所述腔体的内 周壁贴合紧配。A casing split-flow urea mixing device, comprising a rear clamshell end cover and a front clamshell end cover connected to each other, the rear clamshell end cover and the front clamshell end cover form a hollow cavity inside, the The front clamshell end cover has an inlet and an outlet, the inlet and the outlet communicate with the inside of the rear clamshell end cover, and also includes a mixing assembly located in the cavity, the mixing assembly includes a nozzle base, a rotary A flow tube assembly, a partition, a deflector, and a swirl plate, one end of the nozzle base is fixedly connected to one end of the swirl tube assembly, and the other end of the nozzle base is fixedly connected to the rear clam shell end cover And communicate with the external urea nozzle; the center of the partition has a through hole, and the partition is connected with the swirl tube assembly through the through hole; the deflector is located at the swirl tube assembly On the side away from the nozzle base, the deflector is fixedly connected to the rear clamshell end cover; the swirl plate is matched and fixedly connected to the outlet; the nozzle base is located on the rear clamshell end cover The inner end close to the inlet; the deflector is located at the end close to the outlet in the rear clamshell end cover; the partition is located in the middle of the swirl tube assembly, and the outer peripheral wall of the partition Fit tightly with the inner peripheral wall of the cavity.
可选的，所述旋流管组件包括外层旋流管、内开窗套管以及支撑堵盖，所述内开窗套管位于所述外层旋流管的内部，所述内开窗套管通过所述支撑堵盖与所述外层旋流管固连，所述支撑堵盖位于所述外层旋流管远离所述喷嘴底座的一端，所述支撑堵盖与所述外层旋流管相互垂直。Optionally, the swirl tube assembly includes an outer swirl tube, an inner window sleeve and a support cover, the inner window sleeve is located inside the outer swirl tube, and the inner window The casing is fixedly connected to the outer swirl tube through the support plug, the support plug is located at the end of the outer swirl tube away from the nozzle base, and the support plug is connected to the outer swirl tube. The swirl tubes are perpendicular to each other.
可选的，所述外层旋流管与所述内开窗套管同轴，所述外层旋流管的内径与所述内开窗套管的外径比为6/5～3/2。Optionally, the outer swirl tube is coaxial with the inner window sleeve, and the ratio of the inner diameter of the outer swirl tube to the outer diameter of the inner window sleeve is 6/5-3/ 2.
可选的，所述外层旋流管的进口部的周壁上具有两排开口的旋流翅片，所述旋流翅片沿所述外层旋流管的中轴线均匀间隔设置；所述外层旋流管的出口部的周壁上具有若干贯穿的小孔，所述小孔沿所述外层旋流管的中轴线均匀间隔设置；所述外层旋流管的进口部为所述喷嘴底座与所述隔板之间的部分，所述外层旋流管的出口部为所述支撑堵盖与所述隔板之间的部分。Optionally, there are two rows of open swirl fins on the peripheral wall of the inlet portion of the outer swirl tube, and the swirl fins are evenly spaced along the central axis of the outer swirl tube; The peripheral wall of the outlet portion of the outer swirl tube has a number of through holes, and the small holes are evenly spaced along the central axis of the outer swirl tube; the inlet portion of the outer swirl tube is the The part between the nozzle base and the partition, and the outlet of the outer swirl tube is the part between the support blocking cover and the partition.
可选的，所述旋流翅片靠近所述喷嘴底座的一排的长度大于另一排的长度，所述旋流翅片的长度方向沿所述外层旋流管的轴向设置。Optionally, the length of a row of the swirl fins close to the nozzle base is longer than that of the other row, and the length direction of the swirl fins is arranged along the axial direction of the outer swirl tube.
可选的，所述内开窗套管的周壁上具有若干排贯穿的长孔，所述长孔沿所述内开窗套管的中轴线均匀间隔设置，所述长孔的长度方向沿所述内开窗套管的轴向设置。Optionally, the peripheral wall of the inner window casing has several rows of through long holes, the long holes are evenly spaced along the central axis of the inner window casing, and the length direction of the long holes is along the Describe the axial setting of the inner window casing.
可选的，所述支撑堵盖的外周壁上具有多个支撑脚，所述支撑脚沿所述支撑堵盖的中轴线均匀间隔设置，所述支撑堵盖通过所述支撑脚将所述内开窗套管与所述外层旋流管固连；所述支撑堵盖上还具有若干贯穿的通孔，所述通孔沿所述支撑堵盖的中轴线均匀间隔设置。Optionally, there are a plurality of supporting feet on the outer peripheral wall of the supporting blocking cover, and the supporting feet are evenly spaced along the central axis of the supporting blocking cover. The window casing is fixedly connected with the outer swirl tube; the supporting blocking cover also has a number of through holes, and the through holes are evenly spaced along the central axis of the supporting blocking cover.
可选的，所述支撑堵盖靠近所述旋流板的中心位置。Optionally, the support blocking cover is close to the center of the swirl plate.
可选的，所述旋流板与所述出口同轴；所述旋流板的中心具有贯穿的锥形孔，所述锥形孔沿远离所述后蚌壳端盖的方向突出，且直径逐渐变小；Optionally, the swirl plate is coaxial with the outlet; the center of the swirl plate has a through conical hole, and the conical hole protrudes in a direction away from the rear clamshell end cover, and the diameter gradually become smaller;
所述旋流板上还具有一圈开口的槽口，所述槽口位于所述锥形孔的外周，所述槽口沿所述旋流板的中轴线均匀间隔设置。The swirl plate also has a circle of open notches, the notches are located on the outer periphery of the tapered hole, and the notches are evenly spaced along the central axis of the swirl plate.
可选的，所述导流板靠近所述旋流板的一侧向下倾斜设置，所述后蚌壳端盖上还具有两个贯穿的分流槽，两个所述分流槽对称设置，所述分流槽位于所述导流板远离所述旋流板的一侧，所述分流槽与所述导流板对应设置。Optionally, the side of the deflector plate close to the swirl plate is inclined downward, and the rear clamshell end cover also has two through-flow splitter grooves, and the two splitter grooves are arranged symmetrically, so that The flow distribution groove is located on the side of the deflector away from the swirl plate, and the flow distribution groove is arranged correspondingly to the flow deflector.
有益效果：与现有技术相比，本发明提供的一种套管分流式尿素混合装置，大大提 升了尿素的分流作用和破碎效果，进而提高了尿素的分解速率并降低了尿素结晶的风险。Beneficial effects: Compared with the prior art, the casing diversion type urea mixing device provided by the present invention greatly improves the splitting effect and crushing effect of urea, further improves the decomposition rate of urea and reduces the risk of urea crystallization.
附图说明Description of drawings
附图用来提供对本发明的进一步理解，并且构成说明书的一部分，与本发明的实施例一起用于解释本发明，并不构成对本发明的限制。在附图中：The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the attached picture:
图1为本发明一个示例性实施例提供的一种套管分流式尿素混合装置的轴测图；Fig. 1 is an axonometric view of a casing shunt type urea mixing device provided by an exemplary embodiment of the present invention;
图2为本发明一个示例性实施例提供的一种套管分流式尿素混合装置的分解示意图；Fig. 2 is an exploded schematic diagram of a casing split type urea mixing device provided by an exemplary embodiment of the present invention;
图3为本发明一个示例性实施例提供的一种套管分流式尿素混合装置的混合组件的分解示意图；Fig. 3 is an exploded schematic diagram of a mixing assembly of a sleeve split type urea mixing device provided by an exemplary embodiment of the present invention;
图4为本发明一个示例性实施例提供的一种套管分流式尿素混合装置的旋流管组件示意图；Fig. 4 is a schematic diagram of a swirl tube assembly of a sleeve split type urea mixing device provided by an exemplary embodiment of the present invention;
图5为本发明一个示例性实施例提供的一种套管分流式尿素混合装置的旋流管组件示意图；Fig. 5 is a schematic diagram of a swirl tube assembly of a sleeve split type urea mixing device provided by an exemplary embodiment of the present invention;
图6为本发明一个示例性实施例提供的一种套管分流式尿素混合装置的混合腔位置示意图；Fig. 6 is a schematic diagram of the position of the mixing chamber of a casing split type urea mixing device provided by an exemplary embodiment of the present invention;
图7为本发明一个示例性实施例提供的一种套管分流式尿素混合装置的图6的A处放大图；Fig. 7 is an enlarged view at A of Fig. 6 of a sleeve split type urea mixing device provided by an exemplary embodiment of the present invention;
图中：1、后蚌壳端盖；11、分流槽；2、前蚌壳端盖；21、进口；22、出口；3、混合组件；31、喷嘴底座；32、旋流管组件；321、外层旋流管；3211、旋流翅片；3212、小孔；322、内开窗套管；3221、长孔；323、支撑堵盖；324、支撑脚；33、隔板；34、导流板；35、旋流板；351、锥形孔；352、槽口；4、第一混合腔；5、第二混合腔；6、第三混合腔；7、第四混合腔。In the figure: 1. Rear clamshell end cover; 11. Splitter; 2. Front clamshell end cover; 21. Inlet; 22. Outlet; 3. Mixing assembly; 31. Nozzle base; 32. Swirl tube assembly; 321 , outer swirl tube; 3211, swirl fin; 3212, small hole; 322, inner window casing; 3221, long hole; 323, support plug cover; 324, support foot; 33, partition; 34, Deflector; 35, swirl plate; 351, tapered hole; 352, notch; 4, first mixing chamber; 5, second mixing chamber; 6, third mixing chamber; 7, fourth mixing chamber.
具体实施方式detailed description
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“上”、 “下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“顺时针”、“逆时针”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。此外，在本发明的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "upper", "lower", "front", "rear", "left", " The orientation or positional relationship indicated by "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" etc. is based on the The orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as limiting the present invention . In addition, in the description of the present invention, "plurality" means two or more, unless otherwise clearly and specifically defined.
下面结合附图和实施例对本发明作更进一步的说明。The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
如图1所示为一种套管分流式尿素混合装置，包括相互连接的后蚌壳端盖1以及前蚌壳端盖2，后蚌壳端盖1与前蚌壳端盖2形成内部中空的腔体，可选的，该后蚌壳端盖1与前蚌壳端盖2的连接方式包括但不限于焊接、铆接、胶粘以及螺栓连接的其中一种；如图2所示，前蚌壳端盖2上开设有圆形的进口21以及出口22，进口21以及出口22与后蚌壳端盖1的内部连通，可选的，该进口21以及出口22的开设方式包括但不限于激光切割、等离子切割以及铣床加工的其中一种。As shown in Fig. 1, it is a casing shunt type urea mixing device, which includes a rear clamshell end cover 1 and a front clamshell end cover 2 connected to each other, and the rear clamshell end cover 1 and the front clamshell end cover 2 form an internal hollow Optionally, the connection method between the rear clamshell end cover 1 and the front clamshell end cover 2 includes but not limited to one of welding, riveting, gluing and bolting; as shown in Figure 2, the front A circular inlet 21 and an outlet 22 are provided on the clamshell end cover 2, and the inlet 21 and the outlet 22 communicate with the interior of the rear clamshell end cover 1. Optionally, the opening methods of the inlet 21 and the outlet 22 include but are not limited to One of laser cutting, plasma cutting, and milling.
如图2所示，还包括位于腔体内的混合组件3，混合组件3包括喷嘴底座31、旋流管组件32、隔板33、导流板34以及旋流板35，喷嘴底座31的一端与旋流管组件32的一端固连，可选的，该喷嘴底座31的一端与旋流管组件32的一端的连接方式包括但不限于焊接、铆接、胶粘以及螺栓连接的其中一种；喷嘴底座31的另一端与后蚌壳端盖1固连且与外部的尿素喷嘴连通，用于将尿素喷入上述腔体内与废气混合，可选的，该喷嘴底座31的另一端与后蚌壳端盖1的连接方式包括但不限于焊接、铆接、胶粘以及螺栓连接的其中一种；喷嘴底座31位于后蚌壳端盖1内靠近进口21的一端；隔板33的中心具有一通孔，隔板33通过该通孔与旋流管组件32套接连接，可选的，该隔板33与旋流管组件32的连接方式包括但不限于焊接、铆接、胶粘以及螺栓连接的其中一种；隔板33位于旋流管组件32的中部，隔板33的外周壁与腔体的内周壁贴合紧配；导流板34位于旋流管组件32远离喷嘴底座31的一侧，导流板34与后蚌壳端盖1固连，可选的，该导流板34与后蚌壳端盖1的连接方式包括但不限于焊接、铆接、胶粘以及螺栓连接的其中一种；导流板34位于后蚌壳端盖1内靠近出口22的一端；旋流板35与出口22匹配固连，该旋流板35的外周壁与出口22的内周壁贴合，可选的，该旋流板35与出口22的连接方式包括但不限于焊接、铆接、胶粘以及螺栓连接的其中一种。As shown in Figure 2, also comprise the mixing assembly 3 that is positioned at the cavity, mixing assembly 3 comprises nozzle base 31, swirl tube assembly 32, dividing plate 33, deflector 34 and swirl plate 35, one end of nozzle base 31 and One end of the swirl tube assembly 32 is fixedly connected. Optionally, the connection method between one end of the nozzle base 31 and one end of the swirl tube assembly 32 includes but is not limited to one of welding, riveting, gluing and bolting; the nozzle The other end of the base 31 is fixedly connected to the rear clam shell end cover 1 and communicated with the external urea nozzle, which is used to spray urea into the above-mentioned cavity and mix with the exhaust gas. Optionally, the other end of the nozzle base 31 is connected to the rear clam shell The connection method of the end cover 1 includes but not limited to one of welding, riveting, gluing and bolt connection; the nozzle base 31 is located at the end of the rear clam shell end cover 1 close to the inlet 21; the center of the partition 33 has a through hole, The partition 33 is socketed and connected with the swirl tube assembly 32 through the through hole. Optionally, the connection method between the partition 33 and the swirl tube assembly 32 includes but not limited to one of welding, riveting, gluing and bolting. The partition plate 33 is located in the middle of the swirl tube assembly 32, and the outer peripheral wall of the partition plate 33 fits tightly with the inner peripheral wall of the cavity; the deflector 34 is located on the side of the swirl tube assembly 32 away from the nozzle base 31, and the guide The baffle 34 is fixedly connected with the rear clamshell end cover 1. Optionally, the connection method between the baffle 34 and the rear clamshell end cover 1 includes but not limited to one of welding, riveting, gluing and bolting; The deflector 34 is located at the end close to the outlet 22 in the rear clamshell end cover 1; the swirl plate 35 is fixedly connected with the outlet 22, and the outer peripheral wall of the swirl plate 35 is attached to the inner peripheral wall of the outlet 22. Optionally, The way of connecting the swirl plate 35 to the outlet 22 includes but not limited to one of welding, riveting, gluing and bolting.
在本实施例中，通过旋流管组件32和旋流板35的设置，既保证了旋流管组件32轴向方向的尿素和废气的混合效果，又保证了进口21以及出口22轴向方向的混合均匀 性。In this embodiment, through the arrangement of the swirl tube assembly 32 and the swirl plate 35, it not only ensures the mixing effect of urea and exhaust gas in the axial direction of the swirl tube assembly 32, but also ensures the axial direction of the inlet 21 and the outlet 22. mixing uniformity.
在本实施例中，该进口21以及出口22远离后蚌壳端盖1的一侧，沿进口21以及出口22的周向还分别安装有翻边法兰，分别用于连接DPF(柴油颗粒过滤器Diesel Particulate Filter)和SCR(选择性催化还原Selective Catalytic Reduction)。In this embodiment, the inlet 21 and the outlet 22 are away from the side of the rear clam shell end cover 1, and flange flanges are respectively installed along the circumferential direction of the inlet 21 and the outlet 22, which are used to connect the DPF (diesel particulate filter) respectively. Diesel Particulate Filter) and SCR (Selective Catalytic Reduction).
在本实施例中，当废气气流进入本混合装置时，首先从进口21进入，并通过旋流管组件32形成强烈的旋转气流进入旋流管组件32的内部，与此同时尿素从喷嘴底座31的位置喷入该旋流管组件32的内部与废气进行充分均匀的混合；然后，随气流方向冲击在导流板34上，导流板34的设置主要为了防止尿素在后蚌壳端盖1内靠近出口22的底部囤积，从而产生结晶影响尿素与废气的混合均匀度；最后，经旋流板35再次混合后从出口22排出。In this embodiment, when the exhaust gas flow enters the mixing device, it first enters from the inlet 21, and forms a strong swirling air flow through the swirl tube assembly 32 and enters the inside of the swirl tube assembly 32. At the same time, the urea flows from the nozzle base 31 Spray into the inside of the swirl tube assembly 32 to fully and evenly mix with the exhaust gas; then, it impacts on the deflector 34 along the direction of the air flow. The setting of the deflector 34 is mainly to prevent urea The bottom near the outlet 22 is hoarded, resulting in crystallization and affecting the mixing uniformity of urea and exhaust gas; finally, it is discharged from the outlet 22 after being mixed again by the swirl plate 35 .
作为一种可选实施方式，如图3所示，旋流管组件32包括外层旋流管321、内开窗套管322以及支撑堵盖323，内开窗套管322位于外层旋流管321的内部，内开窗套管322通过支撑堵盖323与外层旋流管321固连，可选的，该内开窗套管322、支撑堵盖323以及外层旋流管321的连接方式包括但不限于焊接、铆接、胶粘以及螺栓连接的其中一种；支撑堵盖323位于外层旋流管321远离喷嘴底座31的一端，即靠近出口22的一端；支撑堵盖323与外层旋流管321相互垂直。As an optional implementation, as shown in FIG. 3 , the swirl tube assembly 32 includes an outer swirl tube 321 , an inner window sleeve 322 and a support blocking cover 323 , and the inner window sleeve 322 is located in the outer swirl tube. Inside the tube 321, the inner window sleeve 322 is fixedly connected with the outer swirl tube 321 through the support plug 323. Optionally, the inner window sleeve 322, the support plug 323 and the outer swirl tube 321 The connection method includes but is not limited to one of welding, riveting, gluing and bolt connection; the support blocking cover 323 is located at the end of the outer swirl tube 321 away from the nozzle base 31, that is, the end near the outlet 22; the support blocking cover 323 and The outer swirl tubes 321 are perpendicular to each other.
在本实施例中，旋流管组件32采用套管方式，增强了外层旋流管321与内开窗套管322之间的旋流强度，防止尿素在旋流管组件32的内部囤积产生尿素结晶。In this embodiment, the swirl tube assembly 32 adopts a sleeve method, which enhances the swirl strength between the outer swirl tube 321 and the inner window sleeve 322, and prevents urea from accumulating inside the swirl tube assembly 32. Urea crystallization.
作为一种可选实施方式，如图3所示，外层旋流管321与内开窗套管322同轴，外层旋流管321的内径与内开窗套管322的外径比为6/5～3/2。As an optional implementation, as shown in FIG. 3 , the outer swirl tube 321 is coaxial with the inner window sleeve 322, and the ratio of the inner diameter of the outer swirl tube 321 to the outer diameter of the inner window sleeve 322 is 6/5～3/2.
在本实施例中，外层旋流管321的内径与内开窗套管322的外径比为6/5，该外层旋流管321的内径与内开窗套管322的外径比在6/5～3/2范围内的旋流混合效果区别不大，可灵活布置，但是小于6/5或者大于3/2则会使旋流混合效果下降。In this embodiment, the ratio of the inner diameter of the outer swirl tube 321 to the outer diameter of the inner window sleeve 322 is 6/5, and the ratio of the inner diameter of the outer swirl tube 321 to the outer diameter of the inner window sleeve 322 is 6/5. The swirl mixing effect in the range of 6/5 to 3/2 has little difference and can be arranged flexibly, but if it is less than 6/5 or greater than 3/2, the swirl mixing effect will decrease.
作为一种可选实施方式，如图3所示，外层旋流管321的进口部的周壁上具有两排开口的旋流翅片3211，用于将废气以高速旋转的方式进入外层旋流管321内与尿素进行混合，旋转旋流翅片3211沿外层旋流管321的中轴线均匀间隔设置，可选的，该旋流翅片3211与外层旋流管321的连接方式包括但不限于加工中心机加工、一体成型的其中一种；外层旋流管321的出口部的周壁上具有若干贯穿的小孔3212，小孔3212沿外层旋流管321的中轴线均匀间隔设置，可选的，该小孔3212由加工中心开设或冲压成 型；外层旋流管321的进口部为喷嘴底座31与隔板33之间的部分，外层旋流管321的出口部为支撑堵盖323与隔板33之间的部分。As an optional implementation, as shown in FIG. 3 , there are two rows of open swirl fins 3211 on the peripheral wall of the inlet portion of the outer swirl tube 321, which are used to allow exhaust gas to enter the outer swirl at high speed. The flow tube 321 is mixed with urea, and the rotating swirl fins 3211 are evenly spaced along the central axis of the outer swirl tube 321. Optionally, the connection method between the swirl fins 3211 and the outer swirl tube 321 includes But not limited to one of machining center machining and one-piece molding; the peripheral wall of the outlet of the outer swirl tube 321 has a number of through holes 3212, and the small holes 3212 are evenly spaced along the central axis of the outer swirl tube 321 Setting, optional, the small hole 3212 is opened or stamped by the machining center; the inlet of the outer swirl tube 321 is the part between the nozzle base 31 and the partition 33, and the outlet of the outer swirl tube 321 is The part between the blocking cover 323 and the partition plate 33 is supported.
在本实施例中，由于尿素喷束呈锥形角喷射，该旋流翅片3211的设置加强了尿素起喷位置的旋流作用以及尿素锥形喷束着壁点位置的旋流作用；该小孔3212的设置提升了尿素的分流和破碎效果，进而提高了尿素与废气的混合效率。In this embodiment, since the urea spray is sprayed at a conical angle, the arrangement of the swirl fins 3211 strengthens the swirling effect of the urea spraying position and the swirling effect of the urea cone spraying wall landing point; The arrangement of the small holes 3212 improves the splitting and crushing effect of urea, thereby improving the mixing efficiency of urea and exhaust gas.
作为一种可选实施方式，如图3所示，旋流翅片3211靠近喷嘴底座31的一排的长度大于另一排的长度，旋流翅片3211的长度方向沿外层旋流管321的轴向设置。As an optional implementation, as shown in FIG. 3 , the length of the row of swirl fins 3211 close to the nozzle base 31 is greater than the length of the other row, and the length direction of the swirl fins 3211 is along the direction of the outer swirl tube 321 axial setting.
在本实施例中，外层旋流管321采用两段式旋流翅片3211，靠近喷嘴底座31的一排旋流翅片3211较长，主要加强尿素起喷位置的旋流作用，另一排旋流翅片3211较短，用于增强尿素锥形喷束着壁点位置的旋流作用。In this embodiment, the outer swirl tube 321 adopts two-stage swirl fins 3211, and the row of swirl fins 3211 near the nozzle base 31 is longer, mainly to strengthen the swirl effect of the urea spraying position, and the other row of swirl fins 3211 is longer. The flow fins 3211 are relatively short, and are used to enhance the swirl effect at the impact point of the urea cone spray.
作为一种可选实施方式，如图3所示，内开窗套管322的周壁上具有若干排贯穿的长孔3221，该长孔3221为跑道型，可选的，该长孔3221由加工中心开设或冲压成型；长孔3221沿内开窗套管322的中轴线均匀间隔设置，长孔3221的长度方向沿内开窗套管322的轴向设置。As an optional implementation, as shown in Figure 3, there are several rows of elongated holes 3221 penetrating through the peripheral wall of the inward opening casing 322. The elongated holes 3221 are racetrack-shaped. Optionally, the elongated holes 3221 are processed The center is opened or formed by stamping; the long holes 3221 are evenly spaced along the central axis of the inner window casing 322 , and the length direction of the long holes 3221 is arranged along the axial direction of the inner window casing 322 .
在本实施例中，该长孔3221的设置提升了外层旋流管321与内开窗套管322之间的气流流动性，实现了尿素的快速分流；同时，该长孔3221能够对尿素形成良好的破碎作用。In this embodiment, the arrangement of the elongated hole 3221 improves the fluidity of the air flow between the outer swirl tube 321 and the inner window casing 322, and realizes the rapid shunting of urea; Forms a good crushing action.
作为一种可选实施方式，如图4和图5所示，支撑堵盖323的外周壁上具有多个支撑脚324，支撑脚324沿支撑堵盖323的中轴线均匀间隔设置，支撑堵盖323通过支撑脚324将内开窗套管322与外层旋流管321固连；支撑堵盖323上还开设有若干贯穿的通孔，通孔沿支撑堵盖323的中轴线均匀间隔设置。可选的，也可以仅采用支撑脚324将内开窗套管322与外层旋流管321固连。该支撑堵盖323上的通孔进一步的加强了对尿素的破碎作用。As an optional embodiment, as shown in Figure 4 and Figure 5, there are a plurality of support legs 324 on the peripheral wall of the support block cover 323, and the support legs 324 are evenly spaced along the central axis of the support block cover 323 to support the block cover 323 connects the inner window casing 322 and the outer swirl tube 321 through the supporting feet 324; the supporting blocking cover 323 is also provided with a number of penetrating through holes, and the through holes are evenly spaced along the central axis of the supporting blocking cover 323. Optionally, only the supporting feet 324 may be used to securely connect the inner window casing 322 and the outer swirl tube 321 . The through hole on the support plug 323 further strengthens the crushing effect on urea.
作为一种可选实施方式，如图6所示，支撑堵盖323靠近旋流板35的中心位置，便于尿素直接从旋流板35中心位置导出，提升SCR(选择性催化还原Selective Catalytic Reduction)前端面的氨气分布均匀性。As an optional embodiment, as shown in Figure 6, the support plug 323 is close to the center of the swirl plate 35, so that urea can be directly exported from the center of the swirl plate 35, and the SCR (Selective Catalytic Reduction) can be improved. Ammonia gas distribution uniformity on the front face.
作为一种可选实施方式，如图3所示，旋流板35与出口22同轴；旋流板35的中心具有贯穿的锥形孔351，锥形孔351沿远离后蚌壳端盖1的方向突出，且直径逐渐变小，可选的，该锥形孔351与旋流板35的连接方式包括但不限于焊接、铆接、胶粘以 及一体成型的其中一种；旋流板35上还具有一圈开口的槽口352，该槽口352为猫耳型，槽口352位于锥形孔351的外周，槽口352沿旋流板35的中轴线均匀间隔设置，可选的，该槽口352与旋流板35的连接方式包括但不限于焊接、铆接、胶粘以及一体成型的其中一种。As an optional embodiment, as shown in FIG. 3 , the swirl plate 35 is coaxial with the outlet 22; the center of the swirl plate 35 has a through conical hole 351, and the conical hole 351 is along the direction away from the rear clamshell end cover 1. The direction protrudes, and the diameter gradually becomes smaller. Optionally, the connection method between the tapered hole 351 and the swirl plate 35 includes but not limited to one of welding, riveting, gluing and integral molding; There is also a notch 352 with a circle of openings. The notch 352 is cat-ear-shaped. The notch 352 is located on the outer periphery of the tapered hole 351. The notch 352 is evenly spaced along the central axis of the swirl plate 35. Optionally, the The way of connecting the notch 352 and the swirl plate 35 includes but not limited to one of welding, riveting, gluing and integral molding.
在本实施例中，锥形孔351的设置保证了气流主要从旋流板35的中心位置排出；同时，旋流板35四周均布槽口352，能够将经过的气流形成强旋转气流，提高了对尿素颗粒更进一步的混合效果，进而也保证了尿素分解成氨气的效率和氨气在SCR(选择性催化还原Selective Catalytic Reduction)前端面分布的均匀程度。In this embodiment, the setting of the tapered hole 351 ensures that the airflow is mainly discharged from the central position of the swirl plate 35; at the same time, the notches 352 are evenly distributed around the swirl plate 35, which can form a strong swirling airflow through the passing airflow and improve In order to achieve a further mixing effect on urea particles, it also ensures the efficiency of urea decomposition into ammonia and the uniformity of ammonia distribution on the front face of SCR (Selective Catalytic Reduction).
作为一种可选实施方式，如图2和图3所示，导流板34靠近旋流板35的一侧向下倾斜设置，便于尿素向出口22的方向排出；如图6和图7所示，后蚌壳端盖1上还开设有两个贯穿的分流槽11，两个分流槽11对称设置，分流槽11位于导流板34远离旋流板35的一侧，分流槽11与导流板34对应设置。该分流槽11的设置，使部分气流从导流板34后端两侧流入导流板34的下方，从而吹扫导流板34下方的尿素。As an optional embodiment, as shown in Figure 2 and Figure 3, the side of the deflector 34 close to the swirl plate 35 is inclined downward, so as to facilitate the discharge of urea toward the outlet 22; as shown in Figure 6 and Figure 7 As shown, the rear clamshell end cover 1 is also provided with two through-flow splitter grooves 11, and the two splitter grooves 11 are arranged symmetrically. The flow plate 34 is provided correspondingly. The distributing groove 11 is set so that part of the air flow flows into the bottom of the deflector 34 from both sides of the rear end of the deflector 34 , thereby purging the urea under the deflector 34 .
作为一种可选实施方式，如图6所示，前蚌壳端盖1、后蚌壳端盖2以及混合组件3之间形成了四个混合腔，分别为：As an optional embodiment, as shown in Figure 6, four mixing chambers are formed between the front clam shell end cover 1, the rear clam shell end cover 2 and the mixing assembly 3, which are respectively:
第一混合腔4，由前蚌壳端盖1、后蚌壳端盖2的上端部分、旋流管组件32的上部以及隔板33组成；The first mixing chamber 4 is composed of the front clam shell end cover 1, the upper part of the rear clam shell end cover 2, the upper part of the swirl tube assembly 32 and a partition 33;
第二混合腔5，由外层旋流管321与内开窗套管322组成；The second mixing chamber 5 is composed of an outer swirl tube 321 and an inner window casing 322;
第三混合腔6，由内开窗套管322与支撑堵盖323组成；The third mixing chamber 6 is composed of an inner window casing 322 and a supporting blocking cover 323;
第四混合腔7，由前蚌壳端盖1、后蚌壳端盖2下端部分、旋流管组件32的下部、隔板33、导流板34以及旋流板35组成。The fourth mixing chamber 7 is composed of the front clamshell end cover 1 , the lower part of the rear clamshell end cover 2 , the lower part of the swirl tube assembly 32 , the partition 33 , the deflector 34 and the swirl plate 35 .
为了更好的理解本发明，下面结合附图和一个具体实施例对本发明作更进一步的说明。需要说明的是，该具体实施例所描述的实施例仅仅是本发明一部分实施例，不限定本发明保护的范围。In order to better understand the present invention, the present invention will be further described below in conjunction with the accompanying drawings and a specific embodiment. It should be noted that the embodiments described in this specific embodiment are only some embodiments of the present invention, and do not limit the protection scope of the present invention.
本实施例中，为了解决尿素的分流和破碎效果差，导致尿素分解速率低以及尿素容易结晶的问题，使用上述任一实施例中记载的一种套管分流式尿素混合装置，该装置的工作原理，包括以下步骤：In this embodiment, in order to solve the problems of poor splitting and crushing effect of urea, resulting in low urea decomposition rate and easy crystallization of urea, a casing split type urea mixing device described in any of the above-mentioned embodiments is used, and the working of the device Principle, including the following steps:
步骤一，当废气气流进入本混合装置时，首先进入第一混合腔4中，通过外层旋流管321上的旋流翅片3211形成强烈的旋转气流进入第二混合腔5和第三混合腔6中； 同时，尿素从喷嘴底座31位置喷入第三混合腔6中，通过内开窗套管322完成尿素的破碎和分流，内开窗套管322上的长孔3221开孔较大，尿素不容易在开孔中间累积，从而能够将尿素均匀的分流至第二混合腔5中，进而更容易被第二混合腔5中的强旋流带走；第三混合腔6中的没有着壁在内开窗套管322上的尿素则可以具有更长的混合距离，并最终在支撑堵盖323上完成进一步地破碎和分流；Step 1, when the exhaust gas flow enters the mixing device, it first enters the first mixing chamber 4, and forms a strong swirling airflow through the swirl fins 3211 on the outer swirl tube 321 to enter the second mixing chamber 5 and the third mixing chamber At the same time, urea is sprayed into the third mixing chamber 6 from the position of the nozzle base 31, and the crushing and shunting of urea is completed through the inner window sleeve 322, and the long hole 3221 on the inner window sleeve 322 has a larger opening , urea is not easy to accumulate in the middle of the opening, so that the urea can be evenly divided into the second mixing chamber 5, and then it is easier to be taken away by the strong swirl in the second mixing chamber 5; The urea on the inner window casing 322 on the wall can have a longer mixing distance, and finally complete further crushing and shunting on the supporting plug 323;
步骤二，从第二混合腔5和第三混合腔6中流出的废气和尿素将进入第四混合腔7中，并冲击在导流板34上，导流板34倾斜向下的布置，使尿素便于向出口22的方向排出；同时，两个分流槽11的设置使部分气流从导流板34的后端两侧流入导流板34下方，并吹扫导流板下方的尿素；Step 2, the exhaust gas and urea flowing out from the second mixing chamber 5 and the third mixing chamber 6 will enter the fourth mixing chamber 7, and impact on the deflector 34, the deflector 34 is arranged obliquely downward, so that The urea is convenient to discharge toward the direction of the outlet 22; at the same time, the setting of the two splitter grooves 11 allows part of the air flow to flow into the bottom of the deflector 34 from both sides of the rear end of the deflector 34, and sweep the urea below the deflector;
步骤三，从第四混合腔7排出的废气和尿素通过旋流板35完成最终的尿素和尿素分解出的氨气的混合作用，旋流板35中间的锥形孔351，保证了气流主要从旋流板35中心位置排出，旋流板35上的槽口352能够将经过的气流形成强旋转气流，起到对尿素颗粒更进一步混合的效果，同时也保证了尿素分解成氨气的效率和氨气在SCR(选择性催化还原Selective Catalytic Reduction)前端面分布的均匀程度。 Step 3, the exhaust gas and urea discharged from the fourth mixing chamber 7 pass through the swirl plate 35 to complete the final mixing of urea and ammonia decomposed from the urea. The tapered hole 351 in the middle of the swirl plate 35 ensures that the airflow mainly flows from The central position of the swirl plate 35 is discharged, and the notch 352 on the swirl plate 35 can form a strong swirling air flow through the passing airflow, which has the effect of further mixing the urea particles, and also ensures the efficiency and efficiency of urea decomposition into ammonia gas. The uniformity of ammonia distribution on the front face of SCR (Selective Catalytic Reduction).
综上所述，与现有技术相比，本发明提供的一种套管分流式尿素混合装置，通过四个混合腔的设置，大大提升了尿素的分流作用和破碎效果，进而提高了尿素的分解速率并降低了尿素的结晶风险。To sum up, compared with the prior art, the shunt-type urea mixing device provided by the present invention greatly improves the shunting effect and crushing effect of urea through the setting of four mixing chambers, thereby improving the decomposition rate and reduces the risk of crystallization of urea.
以上所述仅是本发明的优选实施方式，应当指出：对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (10)

  1. 一种套管分流式尿素混合装置，包括相互连接的后蚌壳端盖(1)以及前蚌壳端盖(2)，所述后蚌壳端盖(1)与所述前蚌壳端盖(2)形成内部中空的腔体，所述前蚌壳端盖(2)上具有进口(21)以及出口(22)，所述进口(21)以及所述出口(22)与所述后蚌壳端盖(1)的内部连通，其特征在于，A casing shunt type urea mixing device, comprising a rear clamshell end cover (1) and a front clamshell end cover (2) connected to each other, the rear clamshell end cover (1) and the front clamshell end cover (2) forming a hollow cavity inside, the front clamshell end cover (2) has an inlet (21) and an outlet (22), and the inlet (21) and the outlet (22) are connected to the rear clamshell The internal communication of the shell end cover (1) is characterized in that,
    还包括位于所述腔体内的混合组件(3)，所述混合组件(3)包括喷嘴底座(31)、旋流管组件(32)、隔板(33)、导流板(34)以及旋流板(35)，所述喷嘴底座(31)的一端与所述旋流管组件(32)的一端固连，所述喷嘴底座(31)的另一端与所述后蚌壳端盖(1)固连且与外部的尿素喷嘴连通；所述隔板(33)的中心具有一通孔，所述隔板(33)通过所述通孔与所述旋流管组件(32)套接连接；所述导流板(34)位于所述旋流管组件(32)远离所述喷嘴底座(31)的一侧，所述导流板(34)与所述后蚌壳端盖(1)固连；所述旋流板(35)与所述出口(22)匹配固连；It also includes a mixing assembly (3) located in the cavity, the mixing assembly (3) includes a nozzle base (31), a swirl tube assembly (32), a partition (33), a deflector (34) and a swirl Flow plate (35), one end of the nozzle base (31) is fixedly connected with one end of the swirl tube assembly (32), the other end of the nozzle base (31) is connected with the rear clam shell end cover (1 ) is fixedly connected and communicated with the external urea nozzle; the center of the partition (33) has a through hole, and the partition (33) is socketed and connected with the swirl tube assembly (32) through the through hole; The deflector (34) is located on the side of the swirl tube assembly (32) away from the nozzle base (31), and the deflector (34) is fixed to the rear clam shell end cover (1). connected; the swirl plate (35) is matched and fixedly connected with the outlet (22);
    所述喷嘴底座(31)位于所述后蚌壳端盖(1)内靠近所述进口(21)的一端；所述导流板(34)位于所述后蚌壳端盖(1)内靠近所述出口(22)的一端；所述隔板(33)位于所述旋流管组件(32)的中部，所述隔板(33)的外周壁与所述腔体的内周壁贴合紧配。The nozzle base (31) is located at an end close to the inlet (21) in the rear clam shell end cover (1); the deflector (34) is located in the rear clam shell end cover (1) close to One end of the outlet (22); the partition (33) is located in the middle of the swirl tube assembly (32), and the outer peripheral wall of the partition (33) is closely attached to the inner peripheral wall of the cavity match.
  2. 根据权利要求1所述的一种套管分流式尿素混合装置，其特征在于，所述旋流管组件(32)包括外层旋流管(321)、内开窗套管(322)以及支撑堵盖(323)，所述内开窗套管(322)位于所述外层旋流管(321)的内部，所述内开窗套管(322)通过所述支撑堵盖(323)与所述外层旋流管(321)固连，所述支撑堵盖(323)位于所述外层旋流管(321)远离所述喷嘴底座(31)的一端，所述支撑堵盖(323)与所述外层旋流管(321)相互垂直。The casing shunt type urea mixing device according to claim 1, characterized in that, the swirl tube assembly (32) comprises an outer swirl tube (321), an inner window casing (322) and a support Blocking cover (323), the inner window casing (322) is located inside the outer swirl tube (321), and the inner window casing (322) passes through the support blocking cover (323) and The outer swirl tube (321) is fixedly connected, the support plug (323) is located at the end of the outer swirl tube (321) away from the nozzle base (31), and the support plug (323 ) and the outer swirl tube (321) are perpendicular to each other.
  3. 根据权利要求2所述的一种套管分流式尿素混合装置，其特征在于，所述外层旋流管(321)与所述内开窗套管(322)同轴，所述外层旋流管(321)的内径与所述内开窗套管(322)的外径比为6/5～3/2。A casing shunt type urea mixing device according to claim 2, characterized in that, the outer swirl pipe (321) is coaxial with the inner window casing (322), and the outer swirl The ratio of the inner diameter of the flow tube (321) to the outer diameter of the inner window sleeve (322) is 6/5˜3/2.
  4. 根据权利要求2所述的一种套管分流式尿素混合装置，其特征在于，所述外层旋流管(321)的进口部的周壁上具有两排开口的旋流翅片(3211)，所述旋流翅片(3211)沿所述外层旋流管(321)的中轴线均匀间隔设置；所述外层旋流管(321)的出口部的周壁上具有若干贯穿的小孔(3212)，所述小孔(3212)沿所述外层旋流管(321)的中轴线均匀间隔设置；A casing shunt type urea mixing device according to claim 2, characterized in that, there are two rows of open swirl fins (3211) on the peripheral wall of the inlet portion of the outer swirl tube (321), The swirl fins (3211) are evenly spaced along the central axis of the outer swirl tube (321); there are several small holes ( 3212), the small holes (3212) are evenly spaced along the central axis of the outer swirl tube (321);
    所述外层旋流管(321)的进口部为所述喷嘴底座(31)与所述隔板(33)之间的部分，所述外层旋流管(321)的出口部为所述支撑堵盖(323)与所述隔板(33)之间的部分。The inlet of the outer swirl tube (321) is the part between the nozzle base (31) and the partition (33), and the outlet of the outer swirl tube (321) is the part between the nozzle base (31) and the partition (33). Support the part between the blocking cover (323) and the partition (33).
  5. 根据权利要求4所述的一种套管分流式尿素混合装置，其特征在于，所述旋流翅片(3211)靠近所述喷嘴底座(31)的一排的长度大于另一排的长度，所述旋流翅片(3211)的长度方向沿所述外层旋流管(321)的轴向设置。A casing split-flow urea mixing device according to claim 4, characterized in that, the length of the row of the swirl fins (3211) close to the nozzle base (31) is greater than the length of the other row, The length direction of the swirl fins (3211) is arranged along the axial direction of the outer swirl tube (321).
  6. 根据权利要求2所述的一种套管分流式尿素混合装置，其特征在于，所述内开窗套管(322)的周壁上具有若干排贯穿的长孔(3221)，所述长孔(3221)沿所述内开窗套管(322)的中轴线均匀间隔设置，所述长孔(3221)的长度方向沿所述内开窗套管(322)的轴向设置。A casing shunting type urea mixing device according to claim 2, characterized in that, the peripheral wall of the inner window casing (322) has several rows of long holes (3221) through which the long holes ( 3221) are evenly spaced along the central axis of the inner window casing (322), and the length direction of the long hole (3221) is arranged along the axial direction of the inner window casing (322).
  7. 根据权利要求2所述的一种套管分流式尿素混合装置，其特征在于，所述支撑堵盖(323)的外周壁上具有多个支撑脚(324)，所述支撑脚(324)沿所述支撑堵盖(323)的中轴线均匀间隔设置，所述支撑堵盖(323)通过所述支撑脚(324)将所述内开窗套管(322)与所述外层旋流管(321)固连；A casing shunt type urea mixing device according to claim 2, characterized in that, there are a plurality of supporting feet (324) on the outer peripheral wall of the supporting plug (323), and the supporting feet (324) are arranged along the The central axis of the support blocking cover (323) is evenly spaced, and the support blocking cover (323) connects the inner window sleeve (322) and the outer swirl tube through the support feet (324). (321) fixed connection;
    所述支撑堵盖(323)上还具有若干贯穿的通孔，所述通孔沿所述支撑堵盖(323)的中轴线均匀间隔设置。The supporting blocking cover (323) also has several through holes, and the through holes are evenly spaced along the central axis of the supporting blocking cover (323).
  8. 根据权利要求2所述的一种套管分流式尿素混合装置，其特征在于，所述支撑堵盖(323)靠近所述旋流板(35)的中心位置。The sleeve split flow urea mixing device according to claim 2, characterized in that, the support plug (323) is close to the center of the swirl plate (35).
  9. 根据权利要求1所述的一种套管分流式尿素混合装置，其特征在于，所述旋流板(35)与所述出口(22)同轴；所述旋流板(35)的中心具有贯穿的锥形孔(351)，所述锥形孔(351)沿远离所述后蚌壳端盖(1)的方向突出，且直径逐渐变小；A casing shunt type urea mixing device according to claim 1, characterized in that, the swirl plate (35) is coaxial with the outlet (22); the center of the swirl plate (35) has A penetrating tapered hole (351), the tapered hole (351) protrudes in a direction away from the rear clamshell end cover (1), and its diameter gradually becomes smaller;
    所述旋流板(35)上还具有一圈开口的槽口(352)，所述槽口(352)位于所述锥形孔(351)的外周，所述槽口(352)沿所述旋流板(35)的中轴线均匀间隔设置。There is also a notch (352) with a circle of openings on the swirl plate (35), the notch (352) is located at the outer periphery of the tapered hole (351), and the notch (352) is along the The central axis of the swirl plate (35) is evenly spaced.
  10. 根据权利要求1所述的一种套管分流式尿素混合装置，其特征在于，所述导流板(34)靠近所述旋流板(35)的一侧向下倾斜设置，所述后蚌壳端盖(1)上还具有两个贯穿的分流槽(11)，两个所述分流槽(11)对称设置，所述分流槽(11)位于所述导流板(34)远离所述旋流板(35)的一侧，所述分流槽(11)与所述导流板(34)对应设置。A casing shunt type urea mixing device according to claim 1, characterized in that, the side of the deflector (34) close to the swirl plate (35) is inclined downward, and the rear clam The shell end cover (1) also has two through flow distribution grooves (11), the two flow distribution grooves (11) are arranged symmetrically, and the flow distribution grooves (11) are located at the position where the deflector (34) is far away from the On one side of the swirl plate (35), the splitter groove (11) is arranged correspondingly to the deflector plate (34).
PCT/CN2021/111075 2021-07-19 2021-08-06 Sleeve shunt-type urea mixing device WO2023000397A1 (en)

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CN110080861A (en) * 2018-01-26 2019-08-02 天纳克（苏州）排放***有限公司 Exhaust gas post-treatment device
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