CN113775393A - Back-flushing three-way structure, urea injection system, back-flushing emptying method and vehicle - Google Patents
Back-flushing three-way structure, urea injection system, back-flushing emptying method and vehicle Download PDFInfo
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- CN113775393A CN113775393A CN202111100968.8A CN202111100968A CN113775393A CN 113775393 A CN113775393 A CN 113775393A CN 202111100968 A CN202111100968 A CN 202111100968A CN 113775393 A CN113775393 A CN 113775393A
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- urea
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- flushing
- nozzle
- channel
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 177
- 239000004202 carbamide Substances 0.000 title claims abstract description 177
- 238000011010 flushing procedure Methods 0.000 title claims abstract description 63
- 238000002347 injection Methods 0.000 title claims abstract description 47
- 239000007924 injection Substances 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 55
- 238000007789 sealing Methods 0.000 claims description 35
- 238000007664 blowing Methods 0.000 claims description 16
- 230000005489 elastic deformation Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 7
- 239000000243 solution Substances 0.000 description 6
- 230000009471 action Effects 0.000 description 3
- 238000013016 damping Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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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
- F01N3/2093—Periodically blowing a gas through the converter, e.g. in a direction opposite to exhaust gas flow or by reversing exhaust gas flow direction
-
- 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
- F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- 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
The invention relates to the technical field of vehicle emission treatment, in particular to a back-flushing three-way structure, a urea injection system, a back-flushing emptying method and a vehicle. The urea injection system comprises a tee joint body, an air inlet joint, a liquid inlet joint, a urea nozzle joint and a one-way valve assembly, wherein an air receiving channel, a liquid receiving channel, a connecting channel and a nozzle channel are formed in the tee joint body, and the connecting channel is used for communicating the first end of the air receiving channel, the first end of the liquid receiving channel and the first end of the nozzle channel; the air inlet joint is arranged on the tee body and communicated with the second end of the air receiving channel; the liquid inlet joint is arranged on the tee body and communicated with the second end of the liquid receiving channel; the urea nozzle joint is arranged on the tee body and communicated with the second end of the nozzle channel; the check valve component is arranged in the air receiving channel, so that air can only enter the tee joint body from the air inlet connector, urea is prevented from entering the back flushing pipeline, the back flushing function of the urea injection system is guaranteed to operate normally, and the ice expansion failure risk of the urea injection system is reduced.
Description
Technical Field
The invention relates to the technical field of vehicle emission treatment, in particular to a back-flushing three-way structure, a urea injection system, a back-flushing emptying method and a vehicle.
Background
At present, a urea injection system is used as an absolute mainstream of a selective catalytic reduction technology supply system, namely, a standard vehicle urea solution (hereinafter referred to as urea solution) is injected into engine exhaust, the urea solution is heated and decomposed into ammonia gas, and NOx in the exhaust gas is converted into harmless nitrogen gas under the action of a catalyst. However, the urea liquid is frozen at-11 ℃ due to the characteristics of the urea liquid, the expansion volume is about 7%, and when the ambient temperature is low, if the urea liquid is accumulated in the urea injection system after the vehicle is shut down, the urea liquid is frozen and rapidly expands, so that the problem that the urea injection system is easy to expand and damage is caused. However, the existing common back-flushing three-way structure cannot avoid the problem that urea liquid enters a back-flushing pipeline, so that the urea liquid is crystallized in a back-flushing valve easily, the back-flushing function is failed, and the urea liquid accumulation in a urea injection system pipeline is further aggravated.
Therefore, a blowback tee structure is needed to solve the above problems.
Disclosure of Invention
The first purpose of the invention is to provide a back-flushing three-way structure, which prevents urea liquid from entering a back-flushing pipeline, ensures the normal operation of a back-flushing function of a urea injection system, and reduces the risk of ice expansion failure of the urea injection system.
The second purpose of the invention is to provide a urea injection system, which can empty urea liquid in a system pipeline by applying the back-flushing three-way structure, and reduce the risk of ice expansion failure of the urea injection system.
The third purpose of the invention is to provide a back flushing emptying method of a urea injection system, based on the urea injection system, urea liquid in a system pipeline can be emptied, and the risk of ice expansion failure of the urea injection system is reduced.
A fourth object of the present invention is to provide a vehicle, which can convert the automobile exhaust into harmless nitrogen and reduce the risk of ice expansion failure of the urea injection system by using the urea injection system.
In order to realize the purpose, the following technical scheme is provided:
in a first aspect, a blowback tee structure is provided, including:
the three-way body is internally provided with an air receiving channel, a liquid receiving channel, a connecting channel and a nozzle channel, wherein the connecting channel is used for communicating the first end of the air receiving channel, the first end of the liquid receiving channel and the first end of the nozzle channel;
the air inlet joint is arranged on the tee body and communicated with the second end of the air receiving channel;
the liquid inlet joint is arranged on the tee body and communicated with the second end of the liquid receiving channel;
the urea nozzle joint is arranged on the tee body and communicated with the second end of the nozzle channel;
and the check valve assembly is arranged in the gas receiving channel so that gas can only enter the tee joint body from the gas inlet joint.
As an alternative to the blowback three-way structure, the check valve assembly includes:
the air inlet joint is internally provided with a sealing groove matched with the shape of the sealing end of the sealing element;
the elastic piece, the elastic deformation direction of elastic piece with connect the axis direction of gas passageway the same, the one end of elastic piece with connect the inner wall looks butt of passageway, its other end with sealing member looks butt, so that the sealing member seals up the jam the seal groove.
As an alternative of the back-blowing three-way structure, the check valve assembly further comprises a supporting seat, the supporting seat is arranged at a connecting position of the air receiving channel and the connecting channel, one end of the elastic piece is abutted against the supporting seat, the other end of the elastic piece is abutted against the sealing piece, and a through hole communicated with the air receiving channel and the connecting channel is formed in the supporting seat.
As an alternative of the back-blowing three-way structure, an annular boss with a notch is arranged at one end of the air receiving channel close to the connecting channel, and the supporting seat is supported on the boss.
As an alternative of the back-blowing three-way structure, the supporting seat comprises a first column section and a second column section, the diameter of the first column section is smaller than that of the second column section, and part of the elastic piece is sleeved on the first column section.
As an alternative of the back-blowing three-way structure, the axis of the through hole is overlapped with the axis of the supporting seat, and the through hole is a stepped hole with two large ends and a small middle.
As an alternative of the back-blowing tee structure, the back-blowing tee structure further comprises:
the first heat conduction pipe is arranged in the liquid inlet joint and extends into the liquid receiving channel;
the second heat conduction pipe is arranged in the connecting channel and is in contact with the first heat conduction pipe;
and the third heat conduction pipe is arranged in the urea nozzle joint and extends into the nozzle channel, is in contact with the second heat conduction pipe and can transfer the heat of the urea nozzle and the electrically heated urea pipe into the tee joint body.
In a second aspect, a urea injection system is provided, which comprises an air inlet valve, an exhaust valve, a back-flushing valve, a urea tank, a urea pipeline, a back-flushing pipeline, a urea nozzle and the back-flushing three-way structure, wherein one end of the air inlet valve is connected in series with one end of the back-flushing valve, and the other end of the air inlet valve is connected in series with the urea tank; one end of the exhaust valve is connected with the urea tank in series, and the other end of the exhaust valve is communicated with the outside air; the other end of the back flushing valve is connected in series with an air inlet connector of the back flushing tee joint structure through the back flushing pipeline; the liquid inlet joint of the back flushing tee joint structure is connected with the urea tank in series through the urea pipeline, and the urea nozzle joint of the back flushing tee joint structure is connected with the urea nozzle in series.
In a third aspect, a urea injection system blowback emptying method is provided, which is based on the urea injection system, and includes the following steps:
the vehicle is flamed out;
judging the current environment temperature, and starting a back flushing emptying working mode when the environment temperature is lower than a set temperature;
opening an exhaust valve to reduce the pressure of the urea tank to a pressure P1;
opening a back-blowing valve, blowing the urea in the urea pipeline back to the urea tank, closing the back-blowing valve after the pressure of the urea tank rises by delta P1, and stopping back-blowing after the time t1 if the pressure cannot rise;
the back flushing valve is continuously opened, the urea nozzle is opened for time t2, and residual urea in the urea nozzle is sprayed into the post-processor;
the back flushing valve is continuously opened for t3, the urea nozzle is closed, and residual urea in the urea pipeline is ensured;
and (4) opening the exhaust valve for time t4 to exhaust the gas in the urea tank.
In a fourth aspect, a vehicle is provided comprising a urea injection system as described above.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a urea injection system which comprises a tee joint body, an air inlet joint, a liquid inlet joint, a urea nozzle joint and a one-way valve assembly, wherein an air receiving channel, a liquid receiving channel, a connecting channel and a nozzle channel are formed in the tee joint body, and the connecting channel is used for communicating the first end of the air receiving channel, the first end of the liquid receiving channel and the first end of the nozzle channel; the air inlet joint is arranged on the tee body and communicated with the second end of the air receiving channel; the liquid inlet joint is arranged on the tee body and communicated with the second end of the liquid receiving channel; the urea nozzle joint is arranged on the tee body and communicated with the second end of the nozzle channel; the check valve component is arranged in the air receiving channel, so that air can only enter the tee joint body from the air inlet connector, urea can be prevented from entering the back flushing pipeline, the back flushing function of the urea injection system is guaranteed to normally operate, and the ice expansion failure risk of the urea injection system is reduced.
According to the urea injection system provided by the invention, the urea liquid in the system pipeline can be emptied by applying the back-flushing tee joint structure, and the risk of ice expansion failure of the urea injection system is reduced.
The urea injection system back flushing emptying method provided by the invention can empty urea liquid in a system pipeline based on the urea injection system, and reduce the risk of ice expansion failure of the urea injection system.
According to the vehicle provided by the invention, by applying the urea injection system, automobile exhaust can be converted into harmless nitrogen, and the ice expansion failure risk of the urea injection system can be reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a schematic diagram of a urea injection system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a blowback tee structure provided in the embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of a blowback tee structure according to an embodiment of the present invention.
Reference numerals:
1. an intake valve; 2. an exhaust valve; 3. a blowback valve; 4. a urea tank; 5. a urea line; 6. a back flushing pipeline; 7. a back-blowing three-way structure; 71. a tee body; 711. a boss; 72. an air inlet joint; 721. a sealing groove; 73. a liquid inlet joint; 74. a urea nozzle joint; 75. a one-way valve assembly; 751. a seal member; 752. an elastic member; 753. a supporting seat; 7531. a through hole; 75311. a damping hole; 76. a heat conducting component; 761. a first heat conductive pipe; 762. a second heat conductive pipe; 763. a third heat conductive pipe; 8. a urea nozzle.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are used only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements to be referred to must have specific orientations, be constructed in specific orientations, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As shown in fig. 1, the present embodiment provides a urea injection system, which includes an intake valve 1, an exhaust valve 2, a blowback valve 3, a urea tank 4, a urea pipeline 5, a blowback pipeline 6, a blowback tee structure 7, and a urea nozzle 8.
As shown in fig. 2-3, the blowback tee structure 7 provided in this embodiment includes a tee body 71, an air inlet joint 72, a liquid inlet joint 73, a urea nozzle joint 74 and a check valve assembly 75, wherein the tee body 71 is provided with an air receiving channel, a liquid receiving channel, a connecting channel and a nozzle channel, and the connecting channel is used for communicating a first end of the air receiving channel, a first end of the liquid receiving channel and a first end of the nozzle channel; the air inlet joint 72 is arranged on the tee body 71 and communicated with the second end of the air receiving channel; the liquid inlet joint 73 is arranged on the tee body 71 and communicated with the second end of the liquid receiving channel; a urea nozzle joint 74 is mounted on the tee body 71 and communicates with a second end of the nozzle passage; the check valve assembly 75 is arranged in the air receiving channel, so that air can only enter the tee joint body 71 from the air inlet connector 72, urea can be prevented from entering the back flushing pipeline 6, the back flushing function normal operation of the urea injection system is guaranteed, and the ice expansion failure risk of the urea injection system is reduced.
One end of an air inlet valve 1 is connected with one end of a back flushing valve 3 in series, and the other end of the air inlet valve is connected with a urea tank 4 in series; one end of the exhaust valve 2 is connected with the urea tank 4 in series, and the other end of the exhaust valve is communicated with the outside air; the other end of the blowback valve 3 is connected in series with an air inlet joint 72 of the blowback tee joint structure 7 through a blowback pipeline 6; the liquid inlet joint 73 of the back flushing tee joint structure 7 is connected with the urea tank 4 in series through the urea pipeline 5, and the urea nozzle joint 74 of the back flushing tee joint structure 7 is connected with the urea nozzle 8 in series.
In the working process of the urea injection system, when the ECU controls the blowback valve 3 to be opened, compressed gas enters the blowback three-way structure 7 through the blowback pipeline 6, and urea liquid in the compressed gas is blown back to the urea tank 4 along the urea pipeline 5. And then the urea nozzle 8 is opened to blow out urea in the urea nozzle 8, so that the urea is completely free from urea in the urea way, the urea nozzle 8 and the urea pipeline 5 are ensured to have no ice expansion risk in winter, the ice expansion cracking risk of the urea nozzle 8 in winter is thoroughly avoided, and the system is ensured to have no reliability risk when the system is used at the temperature of minus 40 ℃ in winter.
Optionally, the check valve assembly 75 includes a sealing member 751 and an elastic member 752, and a sealing groove 721 matched with the sealing end profile of the sealing member 751 is provided in the intake joint 72; the elastic member 752 is elastically deformed in the same direction as the axial direction of the air receiving passage, and one end of the elastic member 752 abuts against the inner wall of the connection passage and the other end abuts against the sealing member 751, so that the sealing member 751 seals and blocks the sealing groove 721.
For example, the sealing member 751 may be spherical, the sealing groove 721 on the intake joint 72 is hemispherical, and the sealing member 751 can be matched with the sealing groove 721 under the elastic action of the elastic member 752 so as to block the intake joint 72. After the compressed gas is introduced into the gas inlet joint 72, the sealing member 751 is away from the sealing groove 721 under the action of the compressed gas, so that the compressed gas enters the tee joint body 71, and the urea liquid in the back-blowing tee joint structure 7 is back-blown into the urea tank 4. In other embodiments, the seal 751 may also be tapered, with the seal slot 721 on the inlet fitting 72 being tapered. The sealing member 751 and the sealing groove 721 may have other shapes as long as the sealing member 751 can seal and block the sealing groove 721, which is not illustrated herein.
Preferably, the elastic member 752 is a spring.
Optionally, in order to facilitate installation and positioning of the elastic member 752, the check valve assembly 75 further includes a supporting seat 753, the supporting seat 753 is disposed at a connecting portion of the air receiving channel and the connecting channel, one end of the elastic member 752 abuts against the supporting seat 753, the other end of the elastic member 752 abuts against the sealing member 751, and a through hole 7531 communicated with the air receiving channel and the connecting channel is formed in the supporting seat 753.
Preferably, the supporting seat 753 includes a first column section and a second column section, the diameter of the first column section is smaller than that of the second column section, and a part of the elastic member 752 is sleeved on the first column section, so that the installation of the elastic member 752 can be facilitated, and the elastic member 752 can be prevented from being dislocated to influence the sealing function of the sealing member 751.
Illustratively, an annular boss 711 with a notch is arranged at one end of the air receiving channel close to the connecting channel, and the supporting seat 753 is supported on the boss 711. Through the design of the annular boss 711 with the notch, the installation of the supporting seat 753 can be facilitated, and the through hole 7531 in the supporting seat 753 can be communicated with the connecting channel.
Preferably, the axis of the through hole 7531 coincides with the axis of the supporting seat 753, and the through hole 7531 is a stepped hole with two large ends and a small middle. Specifically, the stepped hole comprises a first hole section, a second hole section and a third hole section which are sequentially arranged, the diameter of the first hole section and the diameter of the third hole section are far larger than that of the second hole section, the diameter of the second hole section is about 0.5mm, and the second hole section can be used as a damping hole 75311, so that firstly, the air flow entering speed is controlled, and the damage to parts such as the urea nozzle 8, the check valve assembly 75 and the like caused by too fast air flow entering is avoided; secondly, when the urea nozzle 8 sprays, because urea flows out, pressure reduction can be formed in the tee joint body 71 instantly, the check valve can be opened, but no air current sweeps at the moment, a small amount of urea possibly flows back into the blowback pipe, the damping holes 75311 can effectively restrain pressure wave impact, and the urea blowback is avoided.
Optionally, the gas receiving channel is parallel to the liquid receiving channel, and both the gas receiving channel and the liquid receiving channel are perpendicular to the connecting channel. Further, the distance between the air inlet joint 72 and the liquid inlet joint 73 is as small as possible on the premise of ensuring the insertion space of the pipeline, and when the back blowing fails for some reason, the residual urea in the pipeline can be reduced as much as possible.
Preferably, the inlet connector 73 and the inlet connector 72 are of different connector specifications to avoid misconnection. Illustratively, the liquid inlet joint 73 and the gas inlet joint 72 are fixedly mounted on the tee body 71 by welding.
In order to further reduce the urea liquid accumulation in the back flushing tee joint structure 7, the back flushing tee joint structure 7 further comprises a heat conduction assembly 76, the heat conduction assembly 76 comprises a first heat conduction pipe 761, a second heat conduction pipe 762 and a third heat conduction pipe 763, and the first heat conduction pipe 761 is arranged in the liquid inlet connector 73 and extends into the liquid receiving channel; the second heat pipe 762 is disposed in the connection channel, and the second heat pipe 762 is in contact with the first heat pipe 761; the third heat transfer pipe 763 is provided in the urea nozzle joint 74 and extends into the nozzle passage, and the third heat transfer pipe 763 is in contact with the second heat transfer pipe 762, and can transfer heat of the urea nozzle 8 and the electrically heated urea pipe into the three-way body 71. In addition, through the design of a plurality of heat pipes, even if some residual urea exists in the back flushing tee joint structure 7, the rapid defrosting can be guaranteed through heat transfer of the electric heating urea pipe and the urea nozzle 8.
Alternatively, the tee body 71 is integrally injection-molded from a nylon material, and a plurality of heat pipes are integrally injection-molded in the injection molding.
For convenience of understanding, after the vehicle is shut down in winter, the ECU controls the urea injection system to automatically perform urea back-flushing emptying according to the following steps:
s1, flameout of the vehicle;
s2, judging the current environment temperature, and starting a back-blowing emptying working mode only when the temperature is lower than a certain temperature, such as-5 ℃;
s3, firstly, opening the exhaust valve 2 to reduce the air pressure of the urea tank 4 to the air pressure P1;
s4, opening the back-flushing valve 3, blowing the urea in the urea pipeline 5 back to the urea tank 4, closing the back-flushing valve 3 after the pressure of the urea tank 4 rises by delta P1, and stopping back-flushing after t1 if the pressure cannot rise;
s5, continuously opening the blowback valve 3, opening the urea nozzle 8 for t2, and spraying residual urea in the urea nozzle 8 into the post-processor;
s6, continuing opening the blowback valve 3 for a time t3, closing the urea nozzle 8, and ensuring that no residual urea exists in the urea pipeline 5;
s7, opening time t4 of the exhaust valve 2, and exhausting the gas in the urea tank 4.
The back flushing clearing diagnostic strategy is as follows:
s8, confirming that the electromagnetic coils of the blowback valve 3 and the exhaust valve 2 have no open circuit short circuit fault;
s9, after the blowback valve 3 is opened, the pressure of the urea tank 4 in the time t1 can be increased to delta P2, and delta P2 is less than delta P1, otherwise, a blowback failure fault is reported; in order to ensure the accuracy of the delta P2, at least 3 liquid level points such as 10%, 50% and 100% of the liquid level of the urea tank 4 are calibrated to form a time liquid level corresponding MAP of t1, and difference calculation is carried out on t1 of other point points.
The embodiment also provides a vehicle comprising the urea injection system, and by applying the urea injection system, automobile exhaust can be converted into harmless nitrogen, and the risk of ice expansion failure of the urea injection system can be reduced.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A blowback tee bend structure which characterized in that includes:
the three-way body (71) is internally provided with an air receiving channel, a liquid receiving channel, a connecting channel and a nozzle channel, and the connecting channel is used for communicating the first end of the air receiving channel, the first end of the liquid receiving channel and the first end of the nozzle channel;
the air inlet joint (72) is arranged on the tee body (71) and communicated with the second end of the air receiving channel;
the liquid inlet joint (73) is arranged on the tee body (71) and is communicated with the second end of the liquid receiving channel;
a urea nozzle fitting (74) mounted on the tee body (71) and communicating with a second end of the nozzle passage;
a one-way valve assembly (75) disposed in the gas-receiving passage to allow gas to enter the tee body (71) only from the gas inlet fitting (72).
2. The blowback tee structure of claim 1, wherein said check valve assembly (75) comprises:
a sealing element (751), wherein a sealing groove (721) matched with the sealing end of the sealing element (751) in shape is arranged in the air inlet joint (72);
and the elastic piece (752), the elastic deformation direction of the elastic piece (752) is the same as the axial direction of the air receiving channel, one end of the elastic piece (752) is abutted with the inner wall of the connecting channel, and the other end of the elastic piece (752) is abutted with the sealing piece (751), so that the sealing piece (751) seals and blocks the sealing groove (721).
3. The blowback tee structure of claim 2, wherein said check valve assembly (75) further comprises a support seat (753), said support seat (753) being disposed at a connecting portion of said air receiving passage and said connecting passage, one end of said elastic member (752) abutting against said support seat (753) and the other end abutting against said sealing member (751), said support seat (753) having a through hole (7531) formed therein communicating with said air receiving passage and said connecting passage.
4. The blowback tee structure of claim 3, wherein an annular boss (711) with a notch is provided at an end of said air receiving channel near said connecting channel, and said support seat (753) is supported on said boss (711).
5. The blowback tee structure of claim 4, wherein said support seat (753) comprises a first column section and a second column section, said first column section having a diameter smaller than a diameter of said second column section, a portion of said resilient member (752) being disposed over said first column section.
6. The blowback tee structure of claim 5, wherein the axis of said through hole (7531) coincides with the axis of said support seat (753), said through hole (7531) being a stepped hole with two large ends and a small middle.
7. The blowback tee structure of claim 1, wherein said blowback tee structure (7) further comprises:
a first heat conduction pipe (761) arranged in the liquid inlet joint (73) and extending into the liquid receiving channel;
a second heat conductive pipe (762) provided in the connection passage, the second heat conductive pipe (762) being in contact with the first heat conductive pipe (761);
and a third heat transfer pipe (763) which is provided in the urea nozzle joint (74) and extends into the nozzle passage, wherein the third heat transfer pipe (763) is in contact with the second heat transfer pipe (762) and can transfer heat of the urea nozzle (8) and the electrically heated urea pipe into the tee body (71).
8. A urea injection system, characterized by comprising an air inlet valve (1), an exhaust valve (2), a back-flushing valve (3), a urea tank (4), a urea pipeline (5), a back-flushing pipeline (6), a urea nozzle (8) and a back-flushing tee structure (7) according to any one of claims 1-7, wherein one end of the air inlet valve (1) is connected in series with one end of the back-flushing valve (3), and the other end of the air inlet valve is connected in series with the urea tank (4); one end of the exhaust valve (2) is connected with the urea tank (4) in series, and the other end of the exhaust valve is communicated with the outside air; the other end of the back flushing valve (3) is connected in series with an air inlet joint (72) of the back flushing tee joint structure (7) through the back flushing pipeline (6); liquid inlet joint (73) of blowback tee bend structure (7) pass through urea pipeline (5) with urea jar (4) are established ties, the urea nozzle joint (74) of blowback tee bend structure (7) with urea nozzle (8) are established ties.
9. A method for back flushing an urea injection system, based on the urea injection system of claim 8, the method comprising the steps of:
the vehicle is flamed out;
judging the current environment temperature, and starting a back flushing emptying working mode when the environment temperature is lower than a set temperature;
opening an exhaust valve (2) to reduce the air pressure of the urea tank (4) to an air pressure P1;
opening a back-flushing valve (3), blowing urea in the urea pipeline (5) back to the urea tank (4), closing the back-flushing valve (3) after the pressure of the urea tank (4) rises to delta P1, and stopping back-flushing after time t1 if the pressure cannot rise;
the back flushing valve (3) is continuously opened, the urea nozzle (8) is opened for t2, and residual urea in the urea nozzle (8) is sprayed into the post-processor;
the back flushing valve (3) is continuously opened for t3, the urea nozzle (8) is closed, and residual urea is prevented from existing in the urea pipeline (5);
and (4) opening the exhaust valve (2) for time t4 to exhaust the gas in the urea tank (4).
10. A vehicle comprising a urea injection system as claimed in claim 8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111100968.8A CN113775393A (en) | 2021-09-18 | 2021-09-18 | Back-flushing three-way structure, urea injection system, back-flushing emptying method and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111100968.8A CN113775393A (en) | 2021-09-18 | 2021-09-18 | Back-flushing three-way structure, urea injection system, back-flushing emptying method and vehicle |
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| US5226445A (en) * | 1992-05-05 | 1993-07-13 | Halliburton Company | Valve having convex sealing surface and concave seating surface |
| US20020062817A1 (en) * | 2000-11-27 | 2002-05-30 | Hisashi Endo | Accumulator fuel injection system designed to avoid failure of relief valve caused by pressure pulsation |
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Application publication date: 20211210 |
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