CN111271158A - SCR liquid injection device - Google Patents

SCR liquid injection device Download PDF

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Publication number
CN111271158A
CN111271158A CN201811470817.XA CN201811470817A CN111271158A CN 111271158 A CN111271158 A CN 111271158A CN 201811470817 A CN201811470817 A CN 201811470817A CN 111271158 A CN111271158 A CN 111271158A
Authority
CN
China
Prior art keywords
urea
nozzle
liquid
scr
liquid injection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201811470817.XA
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Chinese (zh)
Inventor
李伟
徐露明
谈秉乾
郗大光
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Fuai Electronics Guizhou Co ltd
Original Assignee
Fuai Electronics Guizhou Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fuai Electronics Guizhou Co ltd filed Critical Fuai Electronics Guizhou Co ltd
Priority to CN201811470817.XA priority Critical patent/CN111271158A/en
Publication of CN111271158A publication Critical patent/CN111271158A/en
Pending legal-status Critical Current

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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]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • 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
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1426—Filtration 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F01N2610/146—Control thereof, e.g. control of injectors or injection valves
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1486—Means to prevent the substance from freezing
    • 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
    • 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
    • Y02T10/40—Engine management systems

Abstract

The utility model provides a SCR liquid injection apparatus, includes the urea case, measures the nozzle, urea liquid level, temperature sensor, urea quality sensor, a feed pipe and the exhaust bubble pipe of connecting measurement nozzle and urea case, its characterized in that: the urea case includes a liquid outlet that is located the bottom, the metering nozzle includes a feed liquor mouth, an electromagnetic drive's pressure device, the feed liquor mouth passes through feed pipe intercommunication urea bottom of the case liquid outlet, and the metering nozzle arrange in SCR liquid injection apparatus's lowest position, liquid relies on gravity to pass through in the urea case by nozzle high pressure blowout behind the feed pipe entering metering nozzle, pipeline and the inside gas of metering nozzle and backward flow liquid pass through exhaust bubble pipe gets into the urea case, exhaust bubble pipe's exit end is located urea case upper portion space, and the pipeline is arranged in order to be favorable to gaseous exhaust mode.

Description

SCR liquid injection device
Technical Field
The invention belongs to the field of engine emission control, and particularly relates to a urea liquid supply metering system of an engine exhaust selective reduction (SCR) technology.
Background
With the increasing prominence of environmental problems, energy conservation and emission reduction become the endless requirements of vehicles and engines, and therefore, various countries have a series of vehicle emission standards and become stricter. In this regard, internal combustion engine powered vehicles require the installation of an exhaust after-treatment system in order to meet the emission requirements. For example, scr (selective Catalytic reduction) technology, which is mainly used for Catalytic treatment of pollutants such as NOx in exhaust gas of diesel engines, has become an essential technology for diesel vehicles and the like. The SCR technology requires that the NOx reducing reagent be quantitatively injected into the exhaust gas of the diesel engine and mixed with the exhaust gas before entering the SCR catalytic converter. The reducing agent is a 32.5 wt% urea aqueous solution (also called Diesel Exhaust Fluid DEF = Diesel Exhaust Fluid, or additive blue), or ammonia gas.
The existing SCR system scheme usually comprises a pressure source and a metering nozzle, wherein the pressure source is arranged independently or integrated in a urea box, and no matter which structure has the problem that the low-temperature environment (urea liquid freezing point-11-12 ℃) is difficult to quickly correspond, and a huge ice melting system is required for auxiliary work.
In order to solve the problems of complex ice melting structure and cost, the prior proposal provides a method of supplying liquid by the self weight of urea, but the proposal can be implemented by adopting a gas auxiliary means, but the consumption of compressed air on a vehicle can bring other problems to the vehicle or other power devices, and the instability of liquid injection atomization can be brought by compressed air source, engine exhaust pressure fluctuation and the like, thus easily causing influence on the injection and atomization of the system; in other cases, such as oil-braking vehicles or off-road machines, it is a challenge to address the source of compressed air itself.
In summary, the prior art is used to solve the problems of cost, air source, vacuum pump capability, noise, etc. in the SCR system, and it is necessary to provide a new technical solution with simple structure, high reliability, and convenient application.
Disclosure of Invention
The present invention is directed to solving the above-mentioned problems, and an object of the present invention is to provide an SCR liquid injection device which has a simple structure and a low cost, and does not require the consumption of compressed air on a vehicle.
In order to achieve the purpose, the invention adopts the following technical scheme that the SCR liquid injection device comprises a urea box, a metering nozzle, a urea liquid level and temperature sensor, a urea quality sensor, a liquid supply pipe and an exhaust bubble pipe, wherein the liquid supply pipe and the exhaust bubble pipe are connected with the metering nozzle and the urea box. The urea box comprises a liquid outlet at the bottom and an exhaust bubble pipe connector. A liquid outlet at the bottom of the urea box is provided with a filter bag, and liquid in the urea box flows into the metering nozzle after being filtered by the filter bag.
The metering nozzle comprises a liquid inlet connector and an electromagnetic driving pressurizing device. Feed liquor spigot joint passes through feed pipe intercommunication urea bottom of the case liquid outlet, and the measurement nozzle arrange in SCR liquid injection device's extreme low position, liquid rely on gravity to pass through in the urea case the feed pipe gets into and is spouted by nozzle high pressure behind the measurement nozzle, pipeline and measurement nozzle inside gas and backward flow liquid pass through exhaust bubble pipe gets into the urea case, exhaust bubble union coupling exhaust bubble pipe connector, exhaust bubble pipe exit end access to urea case upper portion space, the pipeline is arranged in order to be favorable to gas outgoing's mode. The air exhaust bubble pipe is a forming pipeline with the pipe diameter not larger than 5 mm.
The electromagnetic pressurizing device comprises a solenoid driving device, a sleeve component and a self-opening nozzle, wherein the plunger component is driven by the electromagnetic force of the solenoid device to generate high-pressure liquid and atomize and spray the high-pressure liquid from the self-opening nozzle.
The metering nozzle includes a cooling water jacket. The cooling water jacket is provided with a water inlet connector and a water outlet connector, and is connected to the engine cooling water channel through the water inlet connector and the water outlet connector, and the engine cooling water circulation is utilized to protect the nozzle from being damaged by high exhaust temperature.
Further, the SCR liquid injection device is provided with a de-icing device, and comprises an in-tank de-icing device and an injection end de-icing device, wherein the in-tank de-icing device tightly surrounds the filter screen and the sensors in the urea tank, and the injection end de-icing device is arranged on an external pipeline. The ice melting device can be a device which utilizes the circulation heating of engine cooling water, and can also be an electric heating device.
The SCR liquid injection device also comprises a DCU control unit for providing operating signals for the metering nozzle and for processing the sensor signals.
The invention has the advantages of small volume of each part, high integration level, no need of adding other devices, convenient arrangement, low cost and easy popularization and application.
The invention is described in further detail below with reference to the figures and specific embodiments.
Drawings
FIG. 1 is a schematic structural diagram of a metering nozzle according to an embodiment of the present invention.
FIG. 2 is a schematic structural diagram of an SCR liquid injection device according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
Fig. 1 is a schematic structural diagram of an embodiment of the metering nozzle provided by the present invention, which includes an electromagnetic pressurizing device 7, a self-opening nozzle 3, a liquid inlet nozzle 10 and a liquid return nozzle 21.
The electromagnetic pressurizing means 7 comprises an electromagnetic driving means 2 with a solenoid means 11, a yoke 13 and a magnetic resistance 12 and a sleeve assembly 4. The yoke 13 is made of a magnetically permeable material, and the magnetic resistance 12 is made of a non-magnetically permeable material. The sleeve assembly 4 comprises a sleeve 29, a sleeve 20 which is precisely matched with the sleeve 29 and can move relatively, an inlet valve 31, an outlet valve 32 and a return spring 23. The liquid inlet valve 31 is arranged at one end of the sleeve 29 and comprises an oil inlet valve member 27, an oil inlet valve seat 28 and an oil inlet valve spring 26, the liquid outlet valve 32 is arranged at one end of the sleeve 20 and comprises an oil outlet valve member 24, an oil outlet valve seat 25 and an oil outlet valve spring 23, and the valve member (27 or 24) and the conical surface of the valve seat (28 or 25) are correspondingly matched to form a sealing mechanism. The sleeve 29, the sleeve 20, the inlet valve 31 and the outlet valve 32 form a pressure feed space 33. The working liquid enters from the liquid inlet connector 10 and is filled into the liquid space of the whole metering nozzle 1 through the liquid inlet valve 31, the sleeve 29 of the sleeve 20 component 4 is acted by the electromagnetic force of the electromagnetic driving device 2 and the spring force of the return spring 23, so that the volume of the pressure feeding space 33 is changed alternately, high-pressure working liquid is generated, and the liquid enters the self-opening nozzle 3 through the liquid outlet valve 32 and is sprayed into an exhaust pipe of an engine. The liquid return connector 21 comprises a liquid return channel 22, the liquid return channel 22 is communicated with the sleeve movement volume cavity 34, and return liquid generated by the movement of the sleeve 29 flows back to the urea box 7 through the liquid return connector 21. The sleeve 29 includes straight grooves 29a arranged in alternate axial directions to reduce resistance to reciprocating movement.
The cartridge 20 assembly 4 of the electric liquid metering nozzle 1 includes a volume limiting mechanism (35, 36) for the pumping space 33. The volume limiting mechanisms (35, 36) of the pressure feeding space 33 are arranged at the end of the reciprocating stroke of the sleeve 29 and comprise an upper pump end 35 and a lower pump end 36, the sleeve 29 performs reciprocating motion with a fixed stroke under the action of electromagnetic force and the force of the return spring 23, the volume of the pressure feeding space 33 is periodically changed, and the liquid injection quantity generated by each pulse is equal. The upper pump end 35 includes a limit boss 30 for the oil inlet valve 27 to ensure that the oil inlet valve remains open at the end of the movement stroke of the sleeve 29, so that the supply working fluid can smoothly enter the pump body.
The self-opening nozzle 3 is a poppet nozzle and comprises a nozzle valve body 15, a nozzle valve rod 18 and a nozzle valve spring 16, wherein the nozzle valve body 15 and the nozzle valve rod 18 are matched to form a pressure chamber, and the nozzle is opened when the pressure of the pressure chamber is higher than the preset spring force of the nozzle valve spring 16.
Further, the self-opening nozzle 3 further comprises a nozzle cooling device 5, a nozzle anti-freezing device 6 and a filter screen structure 19. Nozzle cooling device 5 is a circulating water-cooling device, including a cooling water course 37 and cooling water connector 14, cooling water course 37 encircles and arranges from 3 front ends of open nozzle, and cooling water connector 14 is connected to engine cooling water return circuit, takes away the heat from 3 bodies of open nozzle through engine cooling water circulation to protection nozzle 3 does not receive exhaust high temperature to damage. The anti-freezing device 6 of the nozzle 3 is an anti-freezing space 17 arranged in the pressure chamber and used for providing space requirements for liquid generated by expansion in a low-temperature environment and preventing the nozzle from being frozen and cracked to fail. The freeze resistant space 17 may be a thin-walled metal cavity of sufficient surface area to meet the liquid expansion space requirements through elastic deformation of the cavity. The filter screen structure 19 is arranged at the liquid inlet end position of the nozzle, and high-pressure liquid enters the pressure chamber of the self-opening nozzle 3 after being filtered by the filter screen 19 so as to prevent liquid dirt from blocking the nozzle.
The high temperature resistant electric liquid metering nozzle 1 further comprises a nozzle gasket 13. The nozzle gasket 13 comprises a projection 13a which is flush with the bottom surface 38 of the metering nozzle 1, and the metering nozzle 1 is sealed by the projection 13a of the gasket deforming against the bottom surface 38. The nozzle gasket 13 is mounted to the bottom of the metering nozzle 1 by means of a hook 13 b.
Fig. 2 is a schematic structural diagram of an embodiment of the SCR liquid injection device provided by the present invention, which includes a urea tank 2, a metering nozzle 1, urea level and temperature sensors (205, 206), a urea quality sensor 208, a liquid supply pipe 213 and an air bubble pipe 211 connecting the metering nozzle 1 and the urea tank 2, and a de-icing device 9.
The urea tank 2 comprises a liquid outlet 214 at the bottom and a bubble discharge pipe connector 210. The metering nozzle 1 comprises an inlet nipple 219. Feed liquor connector 219 passes through feed pipe 213 intercommunication urea bottom of the case portion liquid outlet 214, and metering nozzle 1 arranges in SCR liquid injection device's the lowest position, liquid relies on gravity to pass through in the urea case 2 feed pipe 213 gets into and spouts by the nozzle high pressure behind the metering nozzle 1, pipeline (213) and the gas and the backward flow liquid of 1 inside runner of metering nozzle pass through exhaust bubble pipe 211 gets into the urea case, exhaust bubble pipe 211 connects exhaust bubble pipe connector 210, is provided with the extension section 209 of exhaust bubble pipe 211 in the urea case 2, and the exit end of exhaust bubble pipe extension section 209 accesss to 2 upper portion spaces of urea case, and the pipeline is arranged in order to be favorable to gas outgoing's mode. The air bubble discharging pipes (211, 209) are formed pipelines with the pipe diameter not larger than 5 mm. A filter bag 207 is arranged at a liquid outlet at the bottom of the urea box 2, and liquid in the urea box 2 flows into the metering nozzle 1 after being filtered by the filter bag 207.
The sensors (205, 206, 208) and the filter bag 207 are integrated in the urea tank 2 by a module body 10 and fixed by a bracket 218, the module body 10 itself includes a positioning step 216, and the module body 10 is mounted on the urea tank 2 by the positioning step 216. The ice melting device 9 comprises an in-tank ice melting device 218a and a spray end ice melting device 212, wherein the in-tank ice melting device 218a is a circulating water heating device and is designed in a mode of being capable of tightly surrounding the filter bag 207 and various sensors (205, 206 and 208) in the urea tank. The ice melting device 218a is integrated with the bracket 218 and connected to an engine circulating water path (not shown) through a water inlet and outlet connector 220 on the module body 10, and the ice is melted by engine cooling water at a low temperature. Tip ice-melting device 212 is disposed in the external conduit and is an electrical heating device.
The SCR liquid injection device further includes a DCU control unit 217, and when an engine ECU (not shown) gives a demand signal, the DCU control unit 217 determines signals (205, 206, 208) of sensors in the urea tank, and when a working condition is satisfied, sends a pulse command to the metering nozzle 1, and the metering nozzle 1 outputs a working liquid at a high pressure and injects the working liquid into the exhaust pipe 8 for exhaust gas treatment. When the metering nozzle 1 cannot normally work due to the icing of the working solution, the injection end ice melting device 212 is powered on to heat the nozzle, so that the normal work of the system is ensured.
The metering nozzle 1 is mounted on the exhaust pipe 8 upstream of the SCR catalyst 221, and is fastened and fixed to the exhaust pipe mount 201 by bolts 200.
The above examples are only for illustrating the essence of the present invention, but not for limiting the present invention. Any modifications, simplifications, or other alternatives made without departing from the principles of the invention are intended to be included within the scope of the invention.
The present invention is not concerned with parts which are the same as or can be implemented using prior art techniques.

Claims (9)

1. The utility model provides a SCR liquid injection apparatus, includes the urea case, measures the nozzle, urea liquid level, temperature sensor, urea quality sensor, a feed pipe and the exhaust bubble pipe of connecting measurement nozzle and urea case, its characterized in that: the urea case includes a liquid outlet that is located the bottom, the metering nozzle includes a feed liquor mouth, an electromagnetic drive's pressure device, the feed liquor mouth passes through feed pipe intercommunication urea bottom of the case liquid outlet, and the metering nozzle arrange in SCR liquid injection apparatus's lowest position, liquid relies on gravity to pass through in the urea case by nozzle high pressure blowout behind the feed pipe entering metering nozzle, pipeline and the inside gas of metering nozzle and backward flow liquid pass through exhaust bubble pipe gets into the urea case, exhaust bubble pipe's exit end is located urea case upper portion space, and the pipeline is arranged in order to be favorable to gaseous exhaust mode.
2. The SCR liquid injection device of claim 1, wherein: the pipe diameters of the liquid supply pipe and the air bubble exhaust pipe are larger than 5 mm.
3. The SCR liquid injection device of claim 2, wherein: the metering nozzle includes a cooling water jacket that is cooled with engine circulating water.
4. The SCR liquid injection device of claim 3, wherein: the device comprises a filter bag, wherein the filter bag is arranged at a liquid outlet at the bottom of a urea box, and liquid flows out of the liquid outlet after being filtered.
5. The SCR liquid injection device of claim 4, wherein: the device comprises an in-tank ice melting device, wherein the in-tank ice melting device tightly surrounds a filter screen and sensors in a urea tank.
6. The SCR liquid injection device of claim 5, wherein: the device comprises a spraying end ice melting device, wherein the spraying end ice melting device is arranged on an external pipeline.
7. The SCR liquid injection device of claim 5 or 6, wherein: the ice melting device may be a heating device using cooling water circulation.
8. The SCR liquid injection device of claim 5 or 6, wherein: the ice melting device may be an electrical heating device.
9. The SCR liquid injection device of any one of claims 1-8, wherein: the system comprises a DCU control unit, wherein the DCU control unit is used for receiving signals of all sensors and sending working signals to a metering nozzle.
CN201811470817.XA 2018-12-04 2018-12-04 SCR liquid injection device Pending CN111271158A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811470817.XA CN111271158A (en) 2018-12-04 2018-12-04 SCR liquid injection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811470817.XA CN111271158A (en) 2018-12-04 2018-12-04 SCR liquid injection device

Publications (1)

Publication Number Publication Date
CN111271158A true CN111271158A (en) 2020-06-12

Family

ID=70996623

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811470817.XA Pending CN111271158A (en) 2018-12-04 2018-12-04 SCR liquid injection device

Country Status (1)

Country Link
CN (1) CN111271158A (en)

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