CN112648051B - Anti-blocking automobile urea nozzle and anti-blocking method for urea nozzle - Google Patents
Anti-blocking automobile urea nozzle and anti-blocking method for urea nozzle Download PDFInfo
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- CN112648051B CN112648051B CN202011536661.8A CN202011536661A CN112648051B CN 112648051 B CN112648051 B CN 112648051B CN 202011536661 A CN202011536661 A CN 202011536661A CN 112648051 B CN112648051 B CN 112648051B
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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
- F01N3/18—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
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2046—Periodically cooling catalytic reactors
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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
- F01N3/18—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]
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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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
- 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
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- 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
The invention discloses an anti-blocking automobile urea nozzle which comprises a urea conveying pipe, a nozzle, a mounting plate, a joint pipe and a heat insulation sleeve, wherein the outer end of the urea conveying pipe is connected with the inner end of the joint pipe and is connected with the nozzle; the heat insulation sleeve is sleeved outside the urea conveying pipe, one end of the heat insulation sleeve is abutted to the mounting plate, and the other end of the heat insulation sleeve is abutted to the nozzle; the inner wall of the heat insulation sleeve is provided with a groove, a closed heat insulation cavity is enclosed between the groove and the outer wall of the urea conveying pipe, the heat insulation sleeve is further provided with an air inlet channel for introducing compressed cooling air into the heat insulation cavity and an air outlet channel for leading out the cooling air, and the air inlet channel is communicated to the compressed cooling air supply unit of the vehicle through a pipeline. The urea nozzle for the anti-clogging vehicle and the anti-clogging method for the urea nozzle, disclosed by the invention, cool the part of the urea nozzle entering the tail gas pipe in air, reduce the working temperature of the urea nozzle and avoid urea crystallization from clogging the nozzle.
Description
Technical Field
The invention relates to the technical field of vehicle accessories, in particular to an anti-blocking automobile urea nozzle and an anti-blocking method of the urea nozzle.
Background
As the atmospheric environment deteriorates, national regulations are increasingly demanding on vehicle emissions. The SCR aftertreatment system is widely used as a main aftertreatment technology for effectively reducing nitrogen oxides in exhaust gas. Selective catalytic reduction SCR is one of the most effective after-treatment technologies currently recognized for reducing NOx emissions from diesel engines, urea SCR injects a certain amount of urea aqueous solution through an exhaust pipe, and the urea aqueous solution is evaporated. The pyrolysis and hydrolysis processes obtain a reducing agent NH3, and NH3 selectively reduces NOx to N2 under the action of a catalyst, so that the content of NOx in the exhaust gas is reduced. Among them, the urea nozzle has been attracting attention as an important part.
The urea nozzle in the SCR system for treating the tail gas of the existing diesel engine is easy to crystallize or generate polymers to block spray orifices at high temperature and low flow, and the part of the nozzle delivery pipe entering the tail gas pipe is placed in the high-temperature environment of the tail gas for a long time, so that the service life is influenced due to poor cooling.
Therefore, it is necessary to develop a urea nozzle for an anti-clogging vehicle and an anti-clogging method for the urea nozzle.
Disclosure of Invention
The invention aims to provide an anti-clogging automobile urea nozzle, which is used for cooling the part of the urea nozzle entering a tail gas pipe by air, reducing the working temperature of the urea nozzle and avoiding urea crystallization from clogging the nozzle.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention discloses an anti-blocking automobile urea nozzle which comprises a urea conveying pipe, a nozzle, a mounting plate, a joint pipe and a heat insulation sleeve, wherein the outer end of the urea conveying pipe is connected with the inner end of the joint pipe to be connected with the nozzle; the heat insulation sleeve is sleeved outside the urea conveying pipe, one end of the heat insulation sleeve is abutted against the mounting plate, and the other end of the heat insulation sleeve is abutted against the nozzle; be provided with the recess on the heat insulating sleeve inside wall, the recess with enclose synthetic confined heat insulating chamber between the urea conveying pipe outer wall, still be provided with on the heat insulating sleeve to heat insulating chamber introduces compressed cooling air's intake duct and derives cooling air's air outlet duct, the intake duct communicates vehicle compressed cooling air supply unit through the pipeline.
Furthermore, the thermal-insulated chamber is along the length direction of urea conveyer pipe surrounds the setting, the intake duct communicates the inner in thermal-insulated chamber, the delivery port communicates the outer end in thermal-insulated chamber.
Furthermore, a spiral groove is arranged in the heat insulation cavity, the spiral groove is arranged around the axis of the urea conveying pipe, the communicating hole of the air inlet channel is arranged at one end of the inner end of the spiral groove, and the communicating hole of the air outlet channel is arranged at one end of the outer end of the spiral groove.
The heat insulation sleeve is characterized by further comprising an air inlet pipe joint and an air outlet pipe joint, wherein joint threaded holes of the air inlet pipe and the air outlet pipe are formed in the outer end face of the heat insulation sleeve, and the air inlet pipe joint and the air outlet pipe joint are respectively in threaded connection with the joint threaded holes of the air inlet pipe and the air outlet pipe; the mounting panel is in inlet tube connects and outlet duct connects the position and is provided with the via hole.
Further, the urea conveying pipe is provided with a surface groove on the outer wall matched with the heat insulation cavity, and the surface groove specifically adopts a spiral groove.
Furthermore, the blowing device also comprises a blowing structure which is arranged on the heat insulation sleeve and can blow compressed air to the outer side surface of the spray hole of the nozzle.
Further, it includes separation blade, scavenging venthole and purge gas way to sweep the structure, the separation blade is the arc and sets up and inwards explore out on heat insulation sleeve's inner end face, the scavenging venthole sets up on the intrados face of separation blade and orientation the orifice lateral surface of nozzle, the one end of purge gas way communicates the scavenging venthole other end communicates compressed air supply unit.
Further, the sweeping structure further comprises a sweeping pipe joint, a joint threaded hole in the outer end of the sweeping air passage is formed in the outer end face of the heat insulation sleeve, the sweeping pipe joint is in threaded connection with the joint threaded hole of the sweeping air passage, and a through hole is formed in the position of the sweeping pipe joint through the mounting plate.
The invention also discloses a method for preventing the urea nozzle from being blocked, wherein a heat insulation cavity is arranged on the outer side of the part of the urea delivery pipe entering the tail gas pipe, compressed cooling air is introduced into the heat insulation cavity, and the part of the urea delivery pipe entering the tail gas pipe is subjected to air cooling.
Further, it is right to set up the structure of sweeping when shutting down the nozzle lateral surface sweeps, avoids remaining urea to accumulate crystallization on the nozzle lateral surface and blocks up.
Compared with the prior art, the invention has the beneficial technical effects that:
according to the anti-blocking automobile urea nozzle, the heat insulation sleeve is arranged on the outer side of the urea conveying pipe, and the heat insulation cavity is arranged on the pipe section of the urea conveying pipe extending into the tail gas pipe, so that the effect of blocking heat transfer can be achieved, the phenomenon that the temperature of the extending end of the urea conveying pipe is too high for a long time due to contact soaking type heating of the urea conveying pipe by high-temperature tail gas, and urea crystallization polymerization and further blocking are easily caused is avoided; through the setting of intake duct and gas outlet channel, be convenient for form air-cooled cooling circuit, introduce compressed cooling air and flow and fill thermal-insulated chamber can reduce the temperature in thermal-insulated chamber, and the pipeline section in the tail gas pipe is visited into to the urea conveyer pipe of cooling simultaneously, has guaranteed that the urea conveyer pipe normally works, has improved spare part's life. The anti-clogging automobile urea nozzle cools the part of the urea nozzle entering the tail gas pipe by air, reduces the working temperature of the urea nozzle and avoids urea crystallization from clogging the nozzle.
In addition, the air inlet channel is communicated with the inner end of the heat insulation cavity, the air outlet channel is communicated with the outer end of the heat insulation cavity, and therefore the introduced compressed cooling air can be guaranteed to firstly contact the inner end with higher temperature for cooling, then flow back to the outer end along the heat insulation cavity and be discharged through the air outlet channel, the utilization rate of cooling air is high, and the cooling effect is good; the spiral groove is arranged in the heat insulation cavity, so that the flow of cooling air can be increased, the cooling and heat exchange time is prolonged, and the cold utilization efficiency of the cooling air is improved. Through the setting of inlet connection and outlet connection, the gas circuit intercommunication of being convenient for can fix the heat insulating sleeve to the positioning groove of mounting panel medial surface through threaded connection moreover, can also the circumference location heat insulating sleeve. The air outlet pipe joint returns to a hot air pipeline of the vehicle air conditioning system through a pipeline, so that heat energy can be recycled, and energy is saved. Through the setting of surface recess, can increase the heat transfer area of urea conveyer pipe, increased with the area of contact of cooling air, improved heat transfer cooling efficiency. Through the arrangement of the purging structure, after the engine is stopped, the ECU controls the compressed air to be purged on the outer side surface of the spraying hole of the nozzle continuously, residual urea liquid is removed, accumulated crystals are avoided, and the service life of parts is prolonged. Through the separation blade, the structure of sweeping that the scavenge air outlet and the purge gas way constitute, the separation blade blocks at the high-speed outflow direction of tail gas, can block tail gas impact to a certain extent, and the orifice blowout of being convenient for forms better umbelliform atomizing urea liquid, improves SCR operation effect.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a schematic sectional view of a urea nozzle for an anti-clogging vehicle according to the present invention;
FIG. 2 is a left side view schematic diagram of the anti-clogging vehicular urea nozzle of the present invention;
FIG. 3 is a schematic sectional view of another angle of the anti-clogging vehicular urea nozzle of the present invention;
FIG. 4 is a schematic right view of the heat insulating sleeve of the present invention;
fig. 5 is a partially enlarged schematic structural view of a portion I in fig. 1.
Description of reference numerals: 1. a urea delivery pipe; 101. a shoulder; 102. a surface groove; 2. a nozzle; 201. spraying a hole; 3. mounting a plate; 301. a positioning groove; 302. mounting holes; 4. a joint pipe; 5. a heat insulating sleeve; 501. an air inlet channel; 502. a helical groove; 503. an air outlet channel; 504. a baffle plate; 505. a scavenging air outlet hole; 506. a purge gas path; 6. an air inlet pipe joint; 7. an air outlet pipe joint; 8. and a scavenging pipe joint.
Detailed Description
The core of the invention is to provide the urea nozzle for the anti-clogging vehicle and the anti-clogging method of the urea nozzle, wherein the part of the urea nozzle entering the tail gas pipe is cooled by air, the working temperature of the urea nozzle is reduced, and the urea is prevented from crystallizing and clogging the nozzle.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Referring to the drawings, FIG. 1 is a schematic sectional front view of a urea nozzle for an anti-clogging vehicle according to the present invention; FIG. 2 is a left side view schematic diagram of the anti-clogging vehicular urea nozzle of the present invention; FIG. 3 is a schematic sectional view of another angle of the anti-clogging vehicular urea nozzle of the present invention; FIG. 4 is a schematic right view of the heat insulating sleeve of the present invention; fig. 5 is a partially enlarged schematic structural view of a portion I in fig. 1.
In a specific embodiment, as shown in fig. 1, 2 and 4, the anti-clogging vehicle urea nozzle comprises a urea delivery pipe 1, a nozzle 2, a mounting plate 3, a joint pipe 4 and a heat insulation sleeve 5, wherein the outer end of the urea delivery pipe 1 is connected with the inner end of the joint pipe 4 and is connected with the nozzle 2, and the nozzle 2 is provided with a spray hole 201 for spraying urea liquid into an exhaust pipe. The joint pipe 4 is communicated with a liquid outlet of an electric control valve of the urea supply unit through a pipeline. The mounting plate 3 is fixedly sleeved in the middle of the urea delivery pipe 1, the outer side face of the mounting plate 3 abuts against a shoulder 101 on the outer wall of the urea delivery pipe 1, the axial positioning is accurate, and two mounting holes 302 used for mounting are formed in one end of the mounting plate 3. The heat insulation sleeve 5 is sleeved outside the urea conveying pipe 1, one end of the heat insulation sleeve 5 is abutted to the inner side surface of the mounting plate 3, and the other end of the heat insulation sleeve is abutted to the nozzle 2. A groove is formed in the inner wall of the heat insulation sleeve 5, and a closed heat insulation cavity is enclosed between the groove and the outer wall of the urea conveying pipe 1. The heat insulation sleeve 5 is further provided with an air inlet channel 501 for introducing compressed cooling air into the heat insulation cavity and an air outlet channel 503 for leading out cooling air, and the air inlet channel 501 is communicated to a compressed cooling air supply unit of the vehicle through a pipeline. The compressed cooling air supply unit may be an on-board compressed air tank of the vehicle and supplies air to the insulation chamber through a corresponding valve block.
The heat insulation sleeve 5 is arranged on the outer side of the urea conveying pipe 1, and the heat insulation cavity is arranged on the pipe section of the urea conveying pipe 1 extending into the tail gas pipe, so that the heat transfer blocking effect can be achieved, and the condition that the long-term temperature of the extending end of the urea conveying pipe 1 is too high due to the contact soaking type heating of the urea conveying pipe 1 by high-temperature tail gas, and the urea crystallization polymerization and then blockage are easily caused is avoided; through the setting of intake duct 501 and gas outlet 503, be convenient for form air-cooled cooling circuit, introduce compressed cooling air and flow and fill thermal-insulated chamber can reduce the temperature in thermal-insulated chamber, and the pipeline section in the tail gas pipe is visited into to cooling urea conveyer pipe 1 simultaneously, has guaranteed urea conveyer pipe 1 and has normally worked, has improved spare part's life. The anti-clogging automobile urea nozzle cools the part of the urea nozzle entering the tail gas pipe by air, reduces the working temperature of the urea nozzle and avoids urea crystallization from clogging the nozzle.
In an embodiment of the present invention, as shown in fig. 1, the insulation chamber is disposed around the probe section along the length direction of the urea delivery pipe 1, the inlet channel 501 is connected to the inner end of the insulation chamber, and the outlet channel 503 is connected to the outer end of the insulation chamber.
Specifically, as shown in fig. 1 and 2, a spiral groove 502 is provided in the heat insulation chamber, the spiral groove 502 is provided around the axis of the urea delivery pipe 1, the communication hole of the inlet channel 501 is provided at one end of the inner end of the spiral groove 502, and the communication hole of the outlet channel 503 is provided at one end of the outer end of the spiral groove 502. Further, the air holes of the air inlet channel 501 at the inner end of the spiral groove 502 enter along the tangential direction of the spiral groove 502. The spiral groove 502 is formed by turning the inner hole wall of the heat insulating sleeve 5.
The air inlet channel 501 is communicated with the inner end of the heat insulation cavity, the air outlet channel 503 is communicated with the outer end of the heat insulation cavity, and therefore the introduced compressed cooling air can be ensured to firstly contact the inner end with higher temperature for cooling, then flow back to the outer end along the heat insulation cavity and be discharged through the air outlet channel 503, the utilization rate of cooling air is high, and the cooling effect is good; the spiral groove 502 is arranged in the heat insulation cavity, so that the flow of cooling air can be increased, the cooling heat exchange time is prolonged, and the cold utilization efficiency of the cooling air is improved.
In an embodiment of the invention, as shown in fig. 1, the anti-clogging vehicle urea nozzle of the invention further includes an air inlet pipe joint 6 and an air outlet pipe joint 7, and the connection end of the air inlet channel 501 and the air outlet channel 503 is provided with a joint threaded hole, and the joint threaded hole is arranged on the outer end face of the heat insulation sleeve 5. The air inlet pipe joint 6 and the air outlet pipe joint 7 are respectively in threaded connection with joint threaded holes of the air inlet channel 501 and the air outlet channel 503. The intake pipe joint 6 is connected to the compressed cooling air supply unit through a pipe. The air outlet pipe joint 7 is directly discharged outside through a pipeline or returns to a hot air pipeline of a vehicle air conditioning system, and energy can be recycled. The mounting plate 3 is provided with through holes at the positions of the air inlet pipe joint 6 and the air outlet pipe joint 7.
Through the setting of intake pipe head 6 and outlet duct joint 7, the gas circuit intercommunication of being convenient for can fix insulation support 5 to the positioning groove 301 of 3 medial surfaces of mounting panel through threaded connection moreover, can also circumference location insulation support 5. The air outlet pipe joint 7 returns to a hot air pipeline of the vehicle air conditioning system through a pipeline, so that heat energy can be recycled, and energy is saved.
In an embodiment of the present invention, as shown in fig. 5, the urea delivery pipe 1 is provided with a surface groove 102 on the outer wall matched with the heat insulation cavity, and the surface groove 102 is a spiral groove. The spiral groove is manufactured by adopting a turning mode. Obviously, the cross-sectional shape of the surface groove 102 may be rectangular or semicircular, and similar modifications fall within the scope of the present invention.
Through the arrangement of the surface grooves 102, the heat exchange area of the urea conveying pipe 1 can be increased, the contact area with cooling air is increased, and the heat exchange cooling efficiency is improved.
In an embodiment of the present invention, as shown in fig. 1 to 4, the anti-clogging vehicle urea nozzle further includes a purging structure, and the purging structure is disposed on the heat insulation sleeve 5 and is capable of purging compressed air to the outer side surface of the nozzle hole 201 of the nozzle 2.
Specifically, as shown in fig. 1 and fig. 2, the purging structure includes a baffle 504, a purging air outlet 505, and a purging air channel 506, the baffle 504 is an arc-shaped plate and is disposed on the inner end surface of the heat insulation sleeve 5 to protrude inward, and the back of the baffle 504 faces the exhaust gas ejection direction in the exhaust gas pipe. The scavenging air outlet hole 505 is opened on the inner arc surface of the baffle 504 and faces the outer side surface of the spray hole 201 of the nozzle 2, and one end of the scavenging air channel 506 is communicated with the scavenging air outlet hole 505 and the other end is communicated with the compressed air supply unit. The compressed cooling air supply unit may be an on-board compressed air tank of the vehicle and supplies air to the purge structure through a corresponding valve block.
Specifically, as shown in fig. 1 and fig. 2, the purging structure further includes a scavenging pipe joint 8, a joint threaded hole at the outer end of the purging gas duct 506 is provided on the outer end surface of the heat insulating sleeve 5, the scavenging pipe joint 8 is screwed with the joint threaded hole of the purging gas duct 506, and the mounting plate 3 is provided with a through hole at the position of the scavenging pipe joint 8.
After the vehicle engine stops running, the ECU controls the pump of the urea supply unit to pump back residual urea liquid in the pipeline, so that the blockage caused by the crystallization of the retained liquid is avoided. However, the outer side surface of the nozzle hole 201 inevitably leaves a little urea liquid and cannot completely flow back. Residual urea liquid can accumulate crystals under high-temperature waste heat, and the long-term development influences the spraying of umbrella-shaped spray from the spraying holes 201 and the SCR operation effect. Through the arrangement of the purging structure, after the engine is stopped, the ECU controls the compressed air to be continuously purged to the outer side surface of the spraying hole 201 of the nozzle 2, residual urea liquid is removed, accumulated crystals are avoided, and the service life of parts is prolonged. Through the sweeping structure formed by the baffle plate 504, the sweeping air outlet 505 and the sweeping air passage 506, the baffle plate 504 blocks the tail gas flowing out direction at high speed, so that the tail gas can be blocked from impacting to a certain extent, the spraying holes 201 can spray the tail gas to form better umbrella-shaped atomized urea liquid, and the SCR operation effect is improved.
The invention also provides a method for preventing the urea nozzle from being blocked, wherein a heat insulation cavity is arranged on the outer side of the part of the urea delivery pipe entering the tail gas pipe, compressed cooling air is introduced into the heat insulation cavity, and the part of the urea delivery pipe entering the tail gas pipe is subjected to air cooling.
Further, set up and sweep the structure and sweep when shutting down the nozzle lateral surface, avoid remaining urea to accumulate crystallization on the nozzle lateral surface and block up.
Specifically, the pressure of the purge compressed air is 0.5 to 0.6 MPa.
According to the anti-blocking automobile urea nozzle, the heat insulation sleeve 5 is arranged on the outer side of the urea conveying pipe 1, and the heat insulation cavity is arranged on the pipe section of the urea conveying pipe 1 extending into the tail gas pipe, so that the effect of blocking heat transfer can be achieved, the phenomenon that the long-term temperature of the extending end of the urea conveying pipe 1 is too high due to contact soaking type heating of high-temperature tail gas on the urea conveying pipe 1, and urea crystallization polymerization and further blocking are easily caused is avoided; through the setting of intake duct 501 and gas outlet 503, be convenient for form air-cooled cooling circuit, introduce compressed cooling air and flow and fill thermal-insulated chamber can reduce the temperature in thermal-insulated chamber, and the pipeline section in the tail gas pipe is visited into to cooling urea conveyer pipe 1 simultaneously, has guaranteed urea conveyer pipe 1 and has normally worked, has improved spare part's life. The anti-clogging automobile urea nozzle cools the part of the urea nozzle entering the tail gas pipe by air, reduces the working temperature of the urea nozzle and avoids urea crystallization from clogging the nozzle. In addition, the air inlet channel 501 is communicated with the inner end of the heat insulation cavity, the air outlet channel 503 is communicated with the outer end of the heat insulation cavity, and therefore the introduced compressed cooling air can be ensured to firstly contact the inner end with higher temperature for cooling, then flow back to the outer end along the heat insulation cavity and be discharged through the air outlet channel 503, the utilization rate of cooling air is high, and the cooling effect is good; the spiral groove 502 is arranged in the heat insulation cavity, so that the flow of cooling air can be increased, the cooling heat exchange time is prolonged, and the cold utilization efficiency of the cooling air is improved. Through the setting of intake pipe head 6 and outlet duct joint 7, the gas circuit intercommunication of being convenient for can fix insulation support 5 to the positioning groove 301 of 3 medial surfaces of mounting panel through threaded connection moreover, can also circumference location insulation support 5. The air outlet pipe joint 7 returns to a hot air pipeline of the vehicle air conditioning system through a pipeline, so that heat energy can be recycled, and energy is saved. Through the arrangement of the surface grooves 102, the heat exchange area of the urea conveying pipe 1 can be increased, the contact area with cooling air is increased, and the heat exchange cooling efficiency is improved. Through the arrangement of the purging structure, after the engine is stopped, the ECU controls the compressed air to be continuously purged to the outer side surface of the spraying hole 201 of the nozzle 2, residual urea liquid is removed, accumulated crystals are avoided, and the service life of parts is prolonged. Through the sweeping structure formed by the baffle plate 504, the sweeping air outlet 505 and the sweeping air passage 506, the baffle plate 504 blocks the tail gas flowing out direction at high speed, so that the tail gas can be blocked from impacting to a certain extent, the spraying holes 201 can spray the tail gas to form better umbrella-shaped atomized urea liquid, and the SCR operation effect is improved.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the scope of the present invention is defined by the claims.
Claims (5)
1. The utility model provides a prevent blockking up automobile-used urea nozzle which characterized in that: the urea feeding device comprises a urea conveying pipe (1), a nozzle (2), a mounting plate (3), a joint pipe (4) and a heat insulation sleeve (5), wherein the outer end of the urea conveying pipe (1) is connected with the inner end of the joint pipe (4) and is connected with the nozzle (2), the mounting plate (3) is fixedly sleeved in the middle of the urea conveying pipe (1), and the joint pipe (4) is communicated with a urea supply unit; the heat insulation sleeve (5) is sleeved outside the urea conveying pipe (1), one end of the heat insulation sleeve (5) is abutted against the mounting plate (3), and the other end of the heat insulation sleeve is abutted against the nozzle (2); a groove is formed in the inner wall of the heat insulation sleeve (5), a closed heat insulation cavity is enclosed between the groove and the outer wall of the urea conveying pipe (1), an air inlet channel (501) for introducing compressed cooling air into the heat insulation cavity and an air outlet channel (503) for leading out cooling air are further arranged on the heat insulation sleeve (5), and the air inlet channel (501) is communicated to a compressed cooling air supply unit of a vehicle through a pipeline; the heat insulation cavity is arranged in a surrounding mode along the length direction of the urea conveying pipe (1), the air inlet channel (501) is communicated with the inner end of the heat insulation cavity, and the air outlet channel (503) is communicated with the outer end of the heat insulation cavity; a spiral groove (502) is arranged in the heat insulation cavity, the spiral groove (502) is arranged around the axis of the urea conveying pipe (1), a communication hole of the air inlet channel (501) is formed in one end of the inner end of the spiral groove (502), and a communication hole of the air outlet channel (503) is formed in one end of the outer end of the spiral groove (502); the urea conveying pipe (1) is provided with a surface groove (102) on the outer wall matched with the heat insulation cavity, and the surface groove (102) is a spiral groove.
2. The anti-clogging vehicular urea nozzle according to claim 1, characterized in that: the heat insulation sleeve is characterized by further comprising an air inlet pipe joint (6) and an air outlet pipe joint (7), joint threaded holes of the air inlet pipe (501) and the air outlet pipe (503) are formed in the outer end face of the heat insulation sleeve (5), and the air inlet pipe joint (6) and the air outlet pipe joint (7) are in threaded connection with the joint threaded holes of the air inlet pipe (501) and the air outlet pipe (503) respectively; the mounting plate (3) is provided with through holes at the positions of the air inlet pipe joint (6) and the air outlet pipe joint (7).
3. The anti-clogging vehicular urea nozzle according to claim 1, characterized in that: the blowing and sweeping device further comprises a blowing and sweeping structure, wherein the blowing and sweeping structure is arranged on the heat insulation sleeve (5) and can blow and sweep compressed air to the outer side face of the spray hole (201) of the nozzle (2).
4. The anti-clogging vehicular urea nozzle according to claim 3, characterized in that: the structure of sweeping includes separation blade (504), scavenging venthole (505) and purge gas way (506), separation blade (504) are the arc board and set up and inwards lean out on the interior terminal surface of heat insulating sleeve (5), scavenging venthole (505) set up on the intrados face of separation blade (504) and towards orifice (201) lateral surface of nozzle (2), the one end of purge gas way (506) is communicated the scavenging venthole (505) other end is communicated compressed air supply unit.
5. The anti-clogging vehicular urea nozzle according to claim 4, characterized in that: sweep the structure and still include scavenging pipe joint (8), the joint screw hole setting of scavenging air flue (506) outer end is in on the outer terminal surface of insulating sleeve (5), scavenging pipe joint (8) threaded connection the joint screw hole of scavenging air flue (506), mounting panel (3) are in scavenging pipe joint (8) position is provided with the via hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN203347897U (en) * | 2013-06-18 | 2013-12-18 | 潍柴动力股份有限公司 | SCR urea nozzle |
| CN104948276A (en) * | 2015-05-13 | 2015-09-30 | 中国重汽集团济南动力有限公司 | Air assisting type urea ejector |
| CN106884699A (en) * | 2015-12-16 | 2017-06-23 | 欧博耐尔有限公司 | Heat-resisting reducing agent injection nozzle |
| CN207598319U (en) * | 2017-09-30 | 2018-07-10 | 东风商用车有限公司 | A kind of engine aftertreatment system metered injection valve |
| CN208950679U (en) * | 2018-10-10 | 2019-06-07 | 山东康钧环保科技有限公司 | A kind of two-fluid SCR urea nozzle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203347897U (en) * | 2013-06-18 | 2013-12-18 | 潍柴动力股份有限公司 | SCR urea nozzle |
| CN104948276A (en) * | 2015-05-13 | 2015-09-30 | 中国重汽集团济南动力有限公司 | Air assisting type urea ejector |
| CN106884699A (en) * | 2015-12-16 | 2017-06-23 | 欧博耐尔有限公司 | Heat-resisting reducing agent injection nozzle |
| CN207598319U (en) * | 2017-09-30 | 2018-07-10 | 东风商用车有限公司 | A kind of engine aftertreatment system metered injection valve |
| CN208950679U (en) * | 2018-10-10 | 2019-06-07 | 山东康钧环保科技有限公司 | A kind of two-fluid SCR urea nozzle |
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