WO2018171214A1 - Système de post-traitement des gaz d'échappement - Google Patents

Système de post-traitement des gaz d'échappement Download PDF

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Publication number
WO2018171214A1
WO2018171214A1 PCT/CN2017/110543 CN2017110543W WO2018171214A1 WO 2018171214 A1 WO2018171214 A1 WO 2018171214A1 CN 2017110543 W CN2017110543 W CN 2017110543W WO 2018171214 A1 WO2018171214 A1 WO 2018171214A1
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WO
WIPO (PCT)
Prior art keywords
urea
pump
assembly
nozzle
gear
Prior art date
Application number
PCT/CN2017/110543
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English (en)
Chinese (zh)
Inventor
杨振球
王学良
樊高峰
彭威波
宋红卫
Original Assignee
天纳克（苏州）排放系统有限公司
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Filing date
Publication date
Application filed by 天纳克（苏州）排放系统有限公司 filed Critical 天纳克（苏州）排放系统有限公司
Publication of WO2018171214A1 publication Critical patent/WO2018171214A1/fr

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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]
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • 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
    • F01N2610/1433—Pumps
    • F01N2610/144—Control thereof
    • 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
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • 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

Definitions

  • the invention relates to an exhaust gas aftertreatment system, and belongs to the technical field of diesel engine exhaust aftertreatment.
  • the post-treatment technology commonly used in the industry is selective catalytic reduction (SCR), and the exhaust gas is installed upstream of the SCR.
  • SCR selective catalytic reduction
  • the urea solution is sprayed in.
  • the urea solution is hydrolyzed and pyrolyzed to generate ammonia gas, and chemically reacts with nitrogen oxides to reduce the concentration of harmful substances.
  • Urea injection systems currently on the market typically include air assist systems and non-air assist systems.
  • any system includes a urea tank assembly, a pump supply unit connected to the urea tank assembly through a low pressure line, a nozzle module connected to the pump supply unit through a high pressure line, and a controller.
  • the pump supply unit includes a urea pump, a pressure sensor, and the like, and the nozzle module includes a urea nozzle or the like.
  • the urea pump is spaced farther from the urea nozzle and is connected by a urea tube.
  • the existing urea injection system contains many components, and the installation is complicated and the cost is high.
  • the present invention adopts the following technical solutions:
  • An exhaust aftertreatment system comprising an exhaust aftertreatment exhaust system and an exhaust aftertreatment encapsulation system
  • the encapsulation system includes a carrier, the injection system including a urea injection system upstream of the carrier and located at the a fuel nozzle upstream of the urea injection system, wherein the urea injection system includes an integrated device of a urea pump and a urea nozzle, wherein the urea pump is configured to pump a urea solution to the urea nozzle, the urea nozzle being used Urea is injected into the exhaust of the engine, the integrated device comprising a housing, a pump assembly at least partially mounted within the housing, and a nozzle assembly cooperating with the pump assembly, wherein the housing includes the pump An inlet passage upstream of the assembly and in communication with the pump assembly and an outlet passage downstream of the pump assembly and in communication with the pump assembly, the outlet passage being in communication with the nozzle assembly; the pump assembly including a motor coil for driving the urea pump, a magnetic body interacting with the
  • the carrier comprises a diesel oxidation catalyst in communication with the exhaust pipe, a diesel particulate filter located downstream of the diesel oxidation catalyst, and a selective catalytic reducing agent located downstream of the diesel particulate filter.
  • the fuel nozzle is located between the diesel oxidation catalyst and the diesel particulate filter, the integrated device being located between the diesel particulate filter and the selective catalytic reduction agent.
  • the exhaust gas aftertreatment system further includes a mixer located downstream of the integrated device and upstream of the selective catalytic reducing agent.
  • the integrated device further includes a controller for independently controlling the urea pump and the urea nozzle, the controller including a circuit board, the motor coil and the nozzle The coils are each connected to the circuit board.
  • the integrated device includes an overflow element connected between the outlet passage and the inlet passage.
  • the present invention also relates to an exhaust aftertreatment system comprising an exhaust aftertreatment exhaust system and an exhaust aftertreatment encapsulation system, wherein the encapsulation system includes a carrier, the injection system including a urea injection system upstream of the carrier And a fuel nozzle located upstream of the urea injection system, wherein the urea injection system includes an integrated device of a urea pump and a urea nozzle, wherein the urea pump is configured to pump a urea solution to the urea nozzle, a urea nozzle for injecting urea into the exhaust of the engine, the integrated device including a pump assembly and a nozzle assembly; the pump assembly including a motor housing assembly, a magnetic cover assembly at least partially located within the motor housing assembly And a pump housing assembly that mates with the motor housing assembly; the motor housing assembly includes an electromagnetic shield and a motor coil at least partially within the electromagnetic shield; the magnetic cover assembly including at least a metal cover partially inserted into the motor coil and a rotor housed in the metal
  • the motor casing assembly includes a controller for independently controlling the urea pump and the urea nozzle, and the controller includes A circuit board, the motor coil and the nozzle coil are both connected to the circuit board.
  • the metal cover is further provided with an anti-freeze body above the rotor, and the anti-freeze body can be compressed to absorb the expansion volume generated by the urea icing.
  • the pump assembly further includes an elastic body housed in the metal cover and located under the rotor, the elastic body being capable of being compressed to absorb an expansion volume generated by urea freezing. .
  • the pump housing assembly further includes a first anti-freeze rod located in the liquid inlet chamber and a second anti-freeze rod located in the liquid discharge chamber, the Both the antifreeze bar and the second antifreeze bar are capable of being compressed when the urea is frozen.
  • the nozzle assembly includes a magnetic portion that interacts with the nozzle coil, a first sleeve that at least partially houses the magnetic portion, and a valve needle portion that is located below the magnetic portion. a second sleeve that at least partially houses the valve needle portion, a spring that acts between the magnetic portion and the valve needle portion, a valve seat that engages with the valve needle portion, and a valve seat that is separate from the valve seat a swirling sheet abutting against the valve seat, the swirling fin being provided with a plurality of swirling grooves.
  • the nozzle coil is located at a periphery of the magnetic portion
  • the valve needle portion is provided with a valve needle
  • the first sleeve is fixed with the second sleeve to form a surrounding a space around a periphery of the valve needle portion
  • the valve needle is provided with a through hole communicating with the space
  • the second sleeve is provided with a communication groove that communicates the space with the swirl groove
  • the valve seat is provided with an injection hole that cooperates with the valve needle.
  • the motor casing assembly is provided with an injection molded connector, the connector is electrically connected to the circuit board, and the circuit board is mounted with a plurality of electronic components,
  • the motor housing assembly also includes a heat sink pad overlying the surface of the electronic component.
  • the magnetic cover assembly includes a plate portion under the metal cover, and the plate portion is fixed to the pump housing assembly by a plurality of screws.
  • the first island portion further includes a first flow guiding groove extending through the first upper surface and communicating with the second positioning hole, and extending through the first upper surface a first outlet hole communicating with the liquid chamber; the first upper surface further provided with a sensor receiving hole located at a side of the first island portion for receiving the sensor, the integrated device including a sensor for detecting temperature and pressure
  • the first housing is further provided with a second outlet hole that communicates with the sensor receiving hole.
  • the first housing is provided with an overflow element receiving groove
  • the integrated device is provided with an overflow element installed in the overflow element receiving groove; when the outlet passage is When the pressure is above a set value, the overflow element opens to return a portion of the urea solution to the inlet passage.
  • the pump housing assembly includes a second housing that is below the first housing and is connected to the first housing, and the second housing includes a second The upper surface and the second lower surface, the gear groove extends through the second upper surface and the second lower surface.
  • the pump housing assembly includes a third housing located below the second housing and connected to the second housing, the third housing including a body portion And a raised portion extending downward from the body portion, wherein the body portion is provided with a third upper surface, the third upper surface is provided with a third annular groove and a third surrounded by the third annular groove Island Department.
  • the nozzle assembly includes a nozzle assembly and a water-cooling base sleeved outside the nozzle assembly, the water-cooling base is provided with a mounting groove, a first cooling passage, and the a second cooling passage spaced apart from the cooling passage and an end cap sealed at a periphery of the mounting groove, the nozzle assembly forming a communication between the end cover and the second sleeve to communicate with the first cooling
  • An annular cooling channel of the passage and the second cooling passage, the first cooling passage is connected to the inlet joint for injection of engine coolant, and the second cooling passage is connected to the outlet joint for the engine coolant to flow out.
  • the integrated device of the pump and the nozzle of the invention integrates the pump and the nozzle well, and has a simple and compact structure, which greatly facilitates the installation of the customer.
  • the pump and nozzle are avoided.
  • the mutual interference between them improves the accuracy of the control.
  • the amount of urea injected into the exhaust gas can be appropriately proportioned with the nitrogen oxides, thereby reducing the excessive injection of urea. Risk of crystallization.
  • Figure 1 is a schematic diagram of the integrated apparatus of the present invention for use in processing engine exhaust.
  • Figure 2 is a schematic diagram of the integrated device of Figure 1.
  • FIG. 3 is a perspective view of an integrated device of the present invention in an embodiment.
  • Figure 4 is a plan view of Figure 3.
  • Figure 5 is a partial exploded perspective view of the integrated device of the present invention with the pump assembly separated from the nozzle assembly.
  • Figure 6 is a partially exploded perspective view of the integrated device of the present invention with the motor housing assembly separated.
  • Figure 7 is a perspective view of the motor housing assembly of Figure 6.
  • Figure 8 is a partially exploded perspective view of the motor housing assembly of Figure 6.
  • Figure 9 is a further exploded perspective view of Figure 8 with the motor coils separated.
  • Figure 10 is a further exploded perspective view of the motor housing assembly of Figure 6 removed.
  • Figure 11 is a further exploded perspective view of Figure 10.
  • Figure 12 is a further exploded perspective view of Figure 11 .
  • Figure 13 is a further exploded perspective view of Figure 12 with the pump housing assembly, nozzle assembly, end caps and the like separated.
  • Figure 14 is a partially exploded perspective view of the pump housing assembly of Figure 13;
  • Figure 15 is an exploded perspective view of the first housing of Figure 14 and the components thereon.
  • Figure 16 is an exploded perspective view of Figure 15 at another angle.
  • Figure 17 is a perspective view of the first housing of Figure 15.
  • Figure 18 is a perspective view of Figure 17 at another angle.
  • Figure 19 is a plan view of Figure 18.
  • Figure 20 is a plan view of Figure 17 .
  • Figure 21 is a schematic cross-sectional view taken along line C-C of Figure 20.
  • Figure 22 is a cross-sectional view taken along line D-D of Figure 20.
  • Figure 23 is a cross-sectional view taken along line E-E of Figure 20.
  • Figure 24 is a cross-sectional view taken along line F-F of Figure 20.
  • Figure 25 is a perspective view showing the first housing of Figure 14 removed.
  • Figure 26 is a partially exploded perspective view of Figure 25.
  • Figure 27 is a plan view of Figure 25.
  • Figure 28 is a further exploded perspective view of Figure 25.
  • Figure 29 is a perspective view of the nozzle assembly of Figure 13;
  • Figure 30 is a cross-sectional view taken along line G-G of Figure 29.
  • Figure 31 is an exploded perspective view of Figure 29.
  • Figure 32 is a further exploded perspective view of Figure 31.
  • Figure 33 is a cross-sectional view taken along line A-A of Figure 4 .
  • Figure 34 is a cross-sectional view taken along line B-B of Figure 4 .
  • Figure 35 is a schematic cross-sectional view taken along line H-H of Figure 33.
  • Figure 36 is an exploded perspective view of the integrated device of the present invention.
  • Figure 37 is a schematic diagram of the exhaust aftertreatment system of the present invention.
  • the present invention discloses an exhaust aftertreatment system 100 that can be applied to treat exhaust gases from engine 10 to reduce emissions of hazardous materials to meet emission regulations.
  • the exhaust aftertreatment system 100 includes an exhaust aftertreatment injection system and an exhaust aftertreatment packaging system 300, wherein the injection system includes a urea injection system 200 and a fuel nozzle 400 located upstream of the urea injection system 200.
  • the fuel nozzle 400 is a hydrocarbon shower (HCI).
  • the urea injection system 200 is used to pump a urea solution (shown by arrow X) from the urea tank 201 and into the intake or exhaust of the engine 10 (eg, into the exhaust pipe 106 or the packaging system 300).
  • An integrated device 1 for injecting a urea solution; the packaging system 300 includes a mixer 301 located downstream of the integrated device 1 and a carrier.
  • the mixer may not be provided, or two or more mixers may be provided.
  • the carrier in the illustrated embodiment of the invention, includes a diesel oxidation catalyst (DOC) 303 in communication with the exhaust pipe 106, a diesel particulate filter (DPF) 304 located downstream of the diesel oxidation catalyst 303, and a location a selective catalytic reduction agent (SCR) 302 downstream of the diesel particulate filter 304, wherein the fuel nozzle 400 is located at the diesel oxidation catalyst 303 and the diesel fuel Between the particulate filters 304, the integrated device 1 is located between the diesel particulate filter 304 and the selective catalytic reducing agent 302.
  • DOC diesel oxidation catalyst
  • DPF diesel particulate filter
  • SCR selective catalytic reduction agent
  • the engine 10 has an engine coolant circulation circuit.
  • the engine coolant circulation circuit includes a first circulation circuit 101 (shown by a thick arrow Y) and a second circulation circuit 102 (refer to a thin arrow Z).
  • the first circulation loop 101 is configured to cool the integrated device 1 to reduce its risk of being burned out by a high temperature engine exhaust; the second circulation loop 102 is used to heat the urea tank 201, To achieve the heating and defrosting function.
  • the integrated device 1 in the first circulation loop 101, is provided with an inlet joint 103 for the engine coolant to flow in and an outlet joint 104 for the engine coolant to flow out; in the second circulation loop 102, it is provided There is a control valve 105 to open or close the control valve 105 under suitable conditions to effect control of the second circulation loop 102.
  • the urea tank 201 is provided with a heating rod 202 connected to the second circulation loop 102 to heat and thaw the urea solution by using the temperature of the engine coolant.
  • the integrated device 1 of the present invention will be described in detail below.
  • the integrated device 1 of the present invention integrates the functions of the urea pump 11 and the urea nozzle 12.
  • the urea pump 11 includes, but is not limited to, a gear pump, a diaphragm pump, a plunger pump, a vane pump, and the like. It should be understood that the term "integrated" as used herein means that the urea pump 11 and the urea nozzle 12 can be mounted as a single device on the intake or exhaust pipe; or the urea pump 11 and the urea nozzle 12 are close to each other and pass through. A shorter connecting pipe is connected and can be regarded as a device as a whole.
  • the exhaust aftertreatment system 100 of the present invention is further provided with a controller 13.
  • the controller 13 is capable of independently controlling the urea pump 11 and the urea nozzle 12.
  • the controller 13 and the fuel nozzle 400 communicate with an engine control unit (ECU) 500 via a CAN bus.
  • ECU engine control unit
  • the controller 13 may be integrated with or separate from the integrated device 1.
  • the controller 13 is integrated in the integrated device 1 to achieve high integration of parts and improve installation convenience of the client.
  • the integrated device 1 is provided with a housing 14 for accommodating the urea pump 11 and the urea nozzle 12.
  • the embodiment shown in Figure 2 is only a rough representation of the housing 14.
  • the housing 14 is shared by the urea pump 11 and the urea nozzle 12; in another embodiment, the housing 14 is divided into a first housing that mates with the urea pump 11. And a second housing that cooperates with the urea nozzle 12, the first housing and the second housing being assembled together to form a unitary body.
  • the housing 14 can also be divided into several to mate with the urea pump 11 and/or the urea nozzle 12.
  • the housing 14 is provided with an inlet passage 15 connected between the urea tank 201 and the urea pump 11, and an outlet passage 16 connected between the urea pump 11 and the urea nozzle 12.
  • inlet in the "inlet passage 15” and “outlet” in the “outlet passage 16" are referenced by the urea pump 11, that is, the upstream of the urea pump 11 is the inlet, and the urea pump 11 The downstream is the exit.
  • the outlet passage 16 is in communication with the urea nozzle 12 to pump a urea solution to the urea nozzle 12. It can be understood that the inlet passage 15 is located upstream of the urea pump 11 and is a low pressure passage; the outlet passage 16 is located downstream of the urea pump 11 and is a high pressure passage.
  • the integrated device 1 is provided with a temperature sensor for detecting the temperature.
  • the temperature sensor may be arranged to communicate with the inlet channel 15 and/or the outlet channel 16; or the temperature sensor may be arranged to be mounted at any location of the integrated device 1.
  • the signal detected by the temperature sensor is transmitted to the controller 13, and the control algorithm designed by the controller 13 based on the input signal and other signals can improve the injection accuracy of the urea nozzle 12.
  • the integrated device 1 is also provided with a pressure sensor for detecting pressure, the pressure sensor being in communication with the outlet passage 16 to detect the pressure in the high pressure passage of the outlet of the urea pump 11.
  • the distance of the internal passage is relatively short, so that the position of the pressure sensor can be considered to be relatively close to the urea nozzle 12.
  • the advantage of this design is that the pressure measured by the pressure sensor is relatively close to the pressure in the urea nozzle 12, which improves the accuracy of the data and thus improves the injection accuracy of the urea nozzle 12.
  • the temperature sensor and the pressure sensor are two components; in another embodiment of the invention, the temperature sensor and the pressure sensor are one component (ie, The sensor 174 is described in detail later, but at the same time has the function of detecting temperature and pressure.
  • the integrated device 1 is further provided with an overflow element 173 connected between the outlet passage 16 and the inlet passage 15.
  • the overflow element 173 includes, but is not limited to, a relief valve, a safety valve, or an electrically controlled valve or the like.
  • the function of the overflow element 173 is to open the overflow element 173 when the pressure in the high pressure passage is higher than the set value, to release the urea solution located in the high pressure passage into the low pressure passage or directly return to the In the urea tank 201, pressure regulation is achieved.
  • the urea pump 11 In order to drive the urea pump 11, the urea pump 11 is provided with a motor coil 111 that communicates with the controller 13. In order to drive the urea nozzle 12, the urea nozzle 12 is provided with a nozzle coil 121 that communicates with the controller 13.
  • the controller 13 communicates with the temperature sensor and the pressure sensor to transmit a temperature signal and a pressure signal to the controller 13.
  • the controller 13 can also receive other signals, such as signals from the CAN bus that are related to engine operating parameters.
  • the controller 13 can also obtain the urine
  • the rotational speed of the prime pump 11, of course, the acquisition of the rotational speed signal can be achieved by a corresponding rotational speed sensor 175 (hardware) or by a control algorithm (software).
  • the controller 13 independently controls the urea pump 11 and the urea nozzle 12. The advantage of such control is that the effect of the action of the urea pump 11 on the urea nozzle 12 can be reduced to achieve a relatively high control accuracy.
  • the integrated device 1 is also provided with a cooling assembly for this purpose, which cools the urea nozzle 12 by means of a cooling medium.
  • the cooling medium includes, but is not limited to, air, and/or engine coolant, and/or lubricating oil, and/or urea, and the like.
  • the illustrated embodiment of the present invention uses water cooling, i.e., cooling the urea nozzle 12 with engine coolant.
  • a cooling passage 141 for circulating the engine coolant is provided in the housing 14.
  • the integrated device 1 is further provided with a mounting seat 107 mounted on the exhaust pipe 106 and a partition fixed to the mounting base 107. Heat shield 109.
  • the main working principle of the integrated device 1 is as follows:
  • the controller 13 drives the urea pump 11 to operate.
  • the urea solution in the urea tank 201 is sucked into the urea pump 11 through the inlet passage 15, and after being pressurized, is sent to the urea nozzle 12 through the outlet passage 16.
  • the controller 13 collects and/or calculates required signals such as temperature, pressure, pump speed, and the like.
  • the controller 13 sends a control signal to the urea nozzle 12, such as energizing the nozzle coil 121, and by controlling the movement of the valve needle to effect urea injection.
  • the controller 13 sends a control signal to the urea pump 11 to control its rotational speed, thereby stabilizing the pressure of the system.
  • the controller 13 independently controls the urea pump 11 and the urea nozzle 12.
  • the integrated device 1 includes a pump assembly 18 and a nozzle assembly 19.
  • the nozzle assembly 19 is at least partially inserted into the pump assembly 18 and welded together.
  • the pump assembly 18 includes a motor housing assembly 181, and a magnetic cover assembly 6 at least partially disposed within the motor housing assembly 181. And a pump housing assembly 182 that mates with the motor housing assembly 181.
  • the motor housing assembly 181 includes an electromagnetic shield 183, a motor coil 111 at least partially located within the electromagnetic shield 183, and a controller 13.
  • the electromagnetic shielding cover 183 is made of a metal material to reduce external interference of internal electronic components and the like, and also reduce the influence of internal electronic components on other external electronic devices.
  • the motor housing assembly 181 also includes a housing 2 that is injection molded at the periphery.
  • the casing 2 A housing cavity 21 for covering the controller 13 and at least a portion of the pump assembly 18, a through hole 22 communicating with the housing cavity 21, and a waterproof venting cover 24 secured in the through hole 22 are included.
  • the motor coil 111 is electrically connected to the controller 13 .
  • the controller 13 includes a circuit board 131 having a plurality of electronic components disposed thereon.
  • the electronic component generates heat during operation, causing the air around it to expand.
  • the present invention solves the problem of crushing the chip and/or the electronic component due to air expansion by providing the waterproof and permeable cover 24, and can also Waterproof effect.
  • the waterproof venting cover 24 can improve the environment in which the controller 13 is placed to enable it to meet operating conditions.
  • the circuit board 131 is annular and is provided with a central aperture 135 in the middle.
  • the cover 2 is injection molded with a connector 132 connected to the circuit board 131.
  • the motor housing assembly 181 further includes a heat dissipation pad 130 covering the surface of the electronic component. In this way, the temperature of the electronic component can be uniformized by the heat dissipation pad 130, thereby avoiding the burning of the electronic component due to local overheating.
  • the magnetic cover assembly 6 includes a metal cover 62 at least partially inserted into the motor coil 111, a plate portion 61 located below the metal cover 62, and a rotor 72 and the like housed in the metal cover 62.
  • the metal cover 62 protrudes upward from the plate portion 61.
  • the metal cover 62 passes upward through the central aperture 135 of the circuit board 131 and is at least partially inserted into the motor coil 111.
  • the plate portion 61 is tightened to the pump housing assembly 182 by a plurality of screws 133 to secure the magnetic cover assembly 6.
  • the metal cover 62 is further provided with an anti-freeze body 70 located above the rotor 72.
  • the anti-freeze body 70 can be compressed when the urea is frozen, and absorbs the expansion volume, thereby avoiding freezing damage.
  • the anti-freeze body 70 is mounted in a sleeve which is then rolled against the top of the metal cover 62 for securing.
  • the pump assembly 18 also includes an elastomer 71 housed within the metal shroud 62 and below the rotor 72, the elastomer 71 being also compressible to absorb the expanded volume created by urea icing.
  • the motor coil 111 is sleeved on the periphery of the metal cover 62.
  • the pump housing assembly 182 includes a first housing 3, a second housing 4, and a third housing 5 that are stacked one above another.
  • the first housing 3, the second housing 4, and the third housing 5 are each made of a metal material.
  • the housing 14 includes the first housing 3, the second housing 4, and the third housing 5.
  • the urea pump 11 is a gear pump including the motor coil 111, the metal cover 62, the elastic body 71 and the rotor 72 located in the metal cover 62, and located at the A first seal ring 73 below the metal cover 62, and a first gear assembly 74 and a second gear assembly 75 that are in mesh with each other are described. Since the gear pump can establish a relatively large working pressure, it is advantageous to increase the flow rate of the urea nozzle 12. In addition, the gear pump can also reverse, which is beneficial to evacuate the residual urea solution. The risk of low urea crystallization.
  • the first housing 3, the second housing 4, and the third housing 5 are machined parts and are fixed by bolts 66. together.
  • the first housing 3 is provided with a card slot 34 on the side and an O-ring 35 held in the slot 34.
  • the first housing 3 and the motor housing assembly 181 are secured together by rolling or welding and are sealed by an O-ring 35.
  • the first housing 3 includes a first upper surface 31, a first lower surface 32, and a first side surface 33, wherein the first upper surface 31 is provided with a first annular groove 311 and surrounded by the first annular groove 311 The first island portion 312.
  • the first annular groove 311 is configured to receive the first sealing ring 73.
  • the sheet portion 61 presses down the first seal ring 73 to effect sealing.
  • the first lower surface 32 is provided with a second annular groove 325 and a second island portion 326 surrounded by the second annular groove 325.
  • the second annular groove 325 is for receiving the second sealing ring 731 (as shown in FIG. 16).
  • the first island portion 312 is provided with a first positioning hole 3121 extending through the first lower surface 32, a second positioning hole 3122 extending through the first lower surface 32, and penetrating the first upper surface 31 and A first outlet hole 3123 communicating with the outlet passage 16 and a first guide groove 3124 penetrating the first upper surface 31 and communicating with the second positioning hole 3122.
  • the urea pump 11 is provided with a first sleeve 76 housed in the first positioning hole 3121 and a second sleeve 77 housed in the second positioning hole 3122.
  • the first housing 3 further includes a plurality of first assembly holes 318 through which the bolts 66 pass, the first assembly holes 318 extending through the first upper surface 31 and the first lower surface 32.
  • the first upper surface 31 further includes a sensor receiving hole 313 located at a side of the first island portion 312 for receiving the sensor 174.
  • the sensor 174 has a function of detecting temperature and pressure.
  • the first housing 3 is further provided with a second outlet hole 3125 that communicates with the outlet passage 16 and the sensor receiving hole 313.
  • the first casing 3 is provided with a liquid inlet passage 332 that penetrates the first side surface 33 to be connected to the urea joint 331.
  • the urea joint 331 includes a filter 3311 near the outer side and an antifreeze element 3312 near the inner side, wherein the filter net 3311 can filter impurities in the urea solution.
  • the antifreeze element 3312 is capable of absorbing the expansion volume as the urea freezes, thereby reducing the risk of freezing.
  • the first housing 3 is provided with a connecting hole 3127 that penetrates the first lower surface 32 and communicates with the liquid inlet passage 332.
  • the first outlet hole 3123 and the connection hole 3127 are both perpendicular to the liquid inlet passage 332.
  • the first positioning hole 3121, the second positioning hole 3122, and the connecting hole 3127 all penetrate downward through the second island portion 326.
  • the first lower surface 32 is provided with a first relief groove 321 that communicates with the first positioning hole 3121 and the second positioning hole 3122 to ensure pressure balance.
  • the first relief groove 321 is located on the second island portion 326.
  • the first housing 3 is further provided with a receiving cavity 322 extending downwardly through the first lower surface 32 for receiving at least a portion of the nozzle assembly 19. Please refer to 21 and 22, the receiving cavity 322 is in communication with the sensor receiving hole 313. At the same time, the receiving cavity 322 is also in communication with the second outlet hole 3125.
  • the second outlet opening 3125 is inclined inside the first housing 3.
  • the first casing 3 is further provided with an overflow element receiving groove 319 that communicates with the liquid inlet passage 332 and the receiving cavity 322 .
  • the overflow element receiving groove 319 extends outward through the first side surface 33 to receive the overflow element 173.
  • the overflow element 173 is a safety valve in the illustrated embodiment of the invention, the purpose of which is to ensure that the pressure in the high pressure passage in the integrated device 1 is within a safe range by means of pressure relief.
  • the first housing 3 is provided with a plug 5122 that fixes the overflow element 173.
  • the urea joint 331 is in communication with the urea tank 201 through a urea connection pipe 333.
  • the exhaust gas aftertreatment system 100 may further be provided with a heating device 334 that heats the urea connection pipe 333.
  • the liquid inlet passage 332 extends horizontally into the interior of the first casing 3.
  • the liquid inlet channel 332 can also be at an angle.
  • the first gear assembly 74 includes a first gear shaft 741 and a first gear 742 fixed to the first gear shaft 741; the second gear assembly 75 includes a second gear shaft. 751 and a second gear 752 fixed to the second gear shaft 751, the first gear 742 and the second gear 752 mesh with each other.
  • the first gear 742 is externally meshed with the second gear 752.
  • the first gear shaft 741 is a drive shaft
  • the second gear shaft 751 is a driven shaft
  • the first gear shaft 741 is higher than the second gear shaft 751.
  • the upper end of the first gear shaft 741 passes through the first sleeve 76 and is fixed to the rotor 72.
  • the upper end of the second gear shaft 751 is positioned in the second boss 77.
  • the motor coil 111 When the motor coil 111 is energized, it interacts with the magnetic body 72, and the electromagnetic force drives the first gear shaft 741 to rotate, thereby driving the first gear 742 and the second gear 752 to rotate.
  • the second housing 4 is located below the first housing 3 and is connected to the first housing 3 .
  • a plurality of positioning pins 328 are further disposed between the first housing 3 and the second housing 4.
  • the second housing 4 includes a second upper surface 41 , a second lower surface 42 , and a second upper surface 41 and a second lower surface 42 for receiving the first gear 742 and the second gear 752 .
  • One side of the gear groove 43 is provided with an inlet chamber 431 communicating with the inlet passage 15, and the other side of the gear groove 43 is provided with an outlet chamber 432 communicating with the outlet passage 16.
  • the liquid inlet chamber 431 is in communication with the connection hole 3127, and the upper end of the liquid outlet chamber 432 is in communication with the first outlet hole 3123.
  • the second housing 4 is further provided with a first anti-freeze rod 441 located in the liquid inlet chamber 431 and located at the The second antifreeze bar 442 in the liquid chamber 432 is described, and both the first antifreeze bar 441 and the second antifreeze bar 442 can be compressed when the urea is frozen.
  • the second housing 4 is further provided with a receiving hole 411 through which at least a part of the nozzle assembly 19 passes.
  • the nozzle assembly 19 protrudes upward from the second upper surface 41 and is received in the receiving cavity 322. With this arrangement, a high pressure urea solution can be delivered to the urea nozzle 12.
  • the second housing 4 further includes a plurality of second assembly holes 418 aligned with the first assembly apertures 318.
  • the third housing 5 is located below the second housing 4 and is connected to the second housing 4.
  • the third housing 5 includes a body portion 51, a boss portion 52 extending downward from the body portion 51, and a flange 53 extending outward from the body portion 51, wherein the flange 53 is provided with the A plurality of third assembly holes 531 are aligned with the second assembly holes 418 for the bolts 66 to pass through.
  • the body portion 51 is provided with a third upper surface 511, and the third upper surface 511 is provided with a third annular groove 512 and a third island portion 513 surrounded by the third annular groove 512.
  • the third annular groove 512 is for receiving the third sealing ring 732 (as shown in FIG. 33).
  • the third island portion 513 is provided with a third positioning hole 5111 penetrating the third upper surface 511 and a fourth positioning hole 5112 penetrating the third upper surface 511.
  • the third housing 5 is provided with a third sleeve 78 received in the third positioning hole 5111 and a fourth sleeve 79 received in the fourth positioning hole 5112 .
  • the lower end of the first gear shaft 741 is positioned in the third bushing 78, and the lower end of the second gear shaft 751 is positioned in the fourth bushing 79.
  • the third island portion 513 is further provided with a second guiding groove 5114 and a third guiding groove 5115 on the third upper surface 511, wherein the second guiding groove 5114 and the third positioning hole 5111 In communication, the third guiding groove 5115 is in communication with the fourth positioning hole 5112.
  • the second guiding groove 5114 and the third guiding groove 5115 are obliquely disposed inside the third casing 5. In the vertical direction, the second guiding groove 5114 and the third guiding groove 5115 are both in communication with the liquid outlet chamber 432, so as to ensure that the urea solution can enter the third positioning hole 5111 and the first
  • the third sleeve 78 and the fourth sleeve 79 are lubricated in the four positioning holes 5112.
  • the urea solution enters the inlet channel 332 from the urea connection tube 333 and enters the inlet chamber 431 through the connection hole 3127; after the pressure of the gear pump, a portion of the high pressure urea solution passes upward through the first outlet port.
  • the overflow element 173 When the pressure is less than the set value of the overflow element 173, the overflow element 173 is closed; and when the pressure is greater than the overflow element 173 At the set point, the overflow element 173 is opened and a portion of the urea solution enters the inlet passage 332 to achieve pressure relief.
  • the inlet passage 15 includes a feed passage 332, a connecting bore 3127, and an inlet chamber 431. Since the inlet passage 15 is located upstream of the urea pump 11, it is called a low pressure passage.
  • the outlet passage 16 includes a liquid outlet chamber 432, a first outlet hole 3123, a second outlet hole 3125, a receiving cavity 322, and the like. Since the outlet passage 16 is located downstream of the urea pump 11, it is referred to as a high pressure passage.
  • the nozzle assembly 19 includes a nozzle assembly 120 and a water-cooled base 190 that is sleeved outside the nozzle assembly 120.
  • the nozzle assembly 120 and the water-cooled base 190 together form a urea nozzle 12.
  • the nozzle assembly 120 includes a nozzle coil 121, a magnetic portion 81 that interacts with the nozzle coil 121, and the magnetic portion 81.
  • the lower needle portion 82 a spring 83 that acts between the magnetic portion 81 and the needle portion 82, and a valve seat 84 (shown in FIG. 30) that is engaged with the valve needle portion 82.
  • the nozzle coil 121 is located at a periphery of the magnetic portion 81.
  • the nozzle assembly 120 further includes a first sleeve 811 at least partially receiving the magnetic portion 81 and a portion at least partially receiving the valve needle portion 82. Two sleeves 812.
  • the nozzle assembly 120 further includes a sleeve portion 122 that is sleeved around the periphery of the nozzle coil 121.
  • the spring 83 is mounted in the magnetic portion 81 and the valve needle portion 82.
  • the valve needle portion 82 is provided with a tapered portion 821 and a valve needle 822 extending downward from the tapered portion 821.
  • the first sleeve 811 is fixed with the second sleeve 812 to form a space 813 surrounding the periphery of the valve needle portion 82, and the valve needle 822 is provided with a communication with the space 813. Hole 814.
  • the nozzle assembly 120 further includes a swirling vane 85 that is formed separately from the valve seat 84 and abuts against the valve seat 84.
  • the swirling vane 85 is provided with a plurality of swirling grooves 851.
  • the second sleeve 812 is provided with a communication groove 815 that communicates the space 813 with the swirl groove 851.
  • the valve seat 84 is provided with an injection hole 841 that cooperates with the valve needle 822.
  • the upper end of the magnetic portion 81 is sleeved with a fourth sealing ring 816 to seal against the inner wall of the receiving cavity 322.
  • the nozzle assembly 120 further includes a terminal encapsulation portion 86 connected to the nozzle coil 121, and the terminal encapsulation portion 86 is sleeved with a fifth sealing ring 817.
  • the water-cooling base 190 includes a main body portion 91, a mounting groove 92 penetrating the main body portion 91 downward, and a mounting flange 93 extending outward from the main body portion 91.
  • the mounting flange 93 is provided with a number of first mounting holes 931 for mounting the integrated device 1 to the exhaust pipe 106 or the packaging system 300.
  • the main body portion 91 is provided with a fourth upper surface 911 and a fourth side surface 912.
  • the fourth upper surface 911 is provided with a receiving cavity 94 for receiving the urea nozzle 12 and a recess 95 for receiving the convex portion 52.
  • the cooling passage 141 located in the water-cooled base 190 includes a first cooling passage 913 penetrating the fourth side surface 912 and a second cooling passage 914 spaced apart from the first cooling passage 913.
  • the first cooling passage 913 is in communication with the inlet joint 103
  • the second cooling passage 914 is in communication with the outlet joint 104.
  • the water-cooling base 190 is provided with an end cap 96 (shown in FIG. 33) sealed to the periphery of the mounting groove 92. In the illustrated embodiment of the invention, the end cap 96 is welded within the mounting groove 92.
  • the water-cooled base 190 forms an annular cooling groove 916 that communicates between the first cooling passage 914 and the second cooling passage 915 between the end cover 96 and the second sleeve 812.
  • the mounting flange 93 is integrally machined with the body portion 91.
  • the mounting flange 93 can also be fabricated separately from the body portion 91 and then welded together.
  • the integrated device 1 of the present invention is an integrated design, which can omit or shorten the prior art urea pipe for connecting the pump and the nozzle, and can also save the prior art pump supply.
  • the connectors between the various sensors and the harness in the unit can also be used without the need to heat the defrosting device, so the reliability is high.
  • the integrated device 1 of the present invention is compact in structure and small in size, and is convenient for installation of various types of vehicles.
  • the internal fluid medium passage is short, the pressure drop is small, the dead volume between the pump and the nozzle is small, and the efficiency is high.
  • the sensor 174 is close to the nozzle and the injection pressure is highly accurate.
  • the integrated device 1 of the present invention can be water-cooled so that the temperature of the urea remaining in the integrated device 1 does not reach the crystallization point, and crystallization is less likely to occur.

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

Abstract

L'invention concerne un système de post-traitement des gaz d'échappement (100), comprenant un système d'injection de post-traitement de gaz d'échappement et un système d'emballage de post-traitement de gaz d'échappement (300). Le système d'injection comprend un dispositif intégré (1) de pompe (11) et de buse (12). Le dispositif intégré (1) comprend un module de pompe (18) et un module de buse (19). Le module de pompe (18) comprend un ensemble carter de moteur (181), un module de couvercle magnétique (6) et un ensemble boitier de pompe (182). L'ensemble carter de moteur (181) comprend un écran électromagnétique (183) et une bobine de moteur (111). L'ensemble carter de moteur (181) et l'ensemble boitier de pompe (182) sont fixés l'un à l'autre par laminage ou soudage. L'ensemble boitier de pompe (182) comprend un canal d'entrée (15) et un canal de sortie (16) en communication avec la pompe (11). Le canal de sortie (16) est en communication avec le module de buse (19). L'ensemble carter de pompe (182) comprend en outre un premier module d'engrenage (74) et un second module d'engrenage (75) l'un en prise avec l'autre. Le système de post-traitement de gaz d'échappement a une structure compacte et une haute précision de commande.
PCT/CN2017/110543 2017-03-20 2017-11-10 Système de post-traitement des gaz d'échappement WO2018171214A1 (fr)

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WO2018171214A1 (fr) * 2017-03-20 2018-09-27 天纳克（苏州）排放系统有限公司 Système de post-traitement des gaz d'échappement
CN108952902A (zh) * 2018-07-17 2018-12-07 山东艾泰克环保科技股份有限公司 一种柴油发动机scr系统喷射装置用防堵塞机构
CN109252928B (zh) * 2018-09-27 2020-03-06 潍柴动力股份有限公司 柴油机排气管路故障检测方法和装置
CN111188673B (zh) * 2019-12-20 2021-08-20 潍柴动力股份有限公司 一种尿素喷射系统及控制方法

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