WO2018171212A1 - 尾气后处理系统 - Google Patents

尾气后处理系统 Download PDF

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Publication number
WO2018171212A1
WO2018171212A1 PCT/CN2017/110541 CN2017110541W WO2018171212A1 WO 2018171212 A1 WO2018171212 A1 WO 2018171212A1 CN 2017110541 W CN2017110541 W CN 2017110541W WO 2018171212 A1 WO2018171212 A1 WO 2018171212A1
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WO
WIPO (PCT)
Prior art keywords
urea
pump
assembly
nozzle
gear
Prior art date
Application number
PCT/CN2017/110541
Other languages
English (en)
French (fr)
Inventor
杨振球
樊高峰
陈国立
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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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 WO2018171212A1 publication Critical patent/WO2018171212A1/zh

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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
    • 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
    • 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
    • F01N2610/1426—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
    • F01N2610/1433—Pumps
    • 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
    • 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
    • F01N2610/1473—Overflow or return means for the substances, e.g. conduits or valves for the return path
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings
    • 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, wherein the encapsulation system includes a carrier, the injection system including a urea injection system upstream of the carrier, the urea
  • the injection system includes a delivery system for pumping urea outwardly from the urea tank, a common rail coupled to the delivery system, and an integrated device of at least one urea pump and urea nozzle coupled to the common rail, wherein the urea a pump for pumping a urea solution to the urea nozzle, the urea nozzle for injecting urea into an exhaust of an engine, the integrated device including a housing, a pump assembly at least partially mounted in the housing, and a chamber A nozzle assembly mated with a pump assembly, wherein the housing includes an inlet passage upstream of the pump assembly and in communication with the pump assembly, and an outlet passage downstream of the pump assembly and in communication with the pump assembly , said An outlet passage is in communication with the nozzle assembly;
  • the delivery system includes a fluid pump and a filter located upstream of the fluid pump.
  • the common rail includes a high pressure chamber connected to the fluid pump, a low pressure chamber connected to the urea tank, and a pressure relief connected between the high pressure chamber and the low pressure chamber a valve, the inlet passage being connected to the high pressure chamber.
  • the integrated devices are at least two and arranged in parallel.
  • the exhaust aftertreatment system further includes a mixer located downstream of the integrated device.
  • 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
  • the urea injection system includes a delivery system for pumping urea outward from the urea tank, a common rail connected to the delivery system, and an integrated device of at least one urea pump and urea nozzle connected to the common rail,
  • the urea pump is configured to pump a urea solution to the urea nozzle, the urea nozzle is for injecting urea into an exhaust gas of an engine
  • the integrated device includes a pump assembly and a nozzle assembly
  • the pump assembly includes a motor machine a housing assembly, a magnetic cover assembly at least partially located within the motor housing assembly, and a pump housing assembly mated with the motor housing assembly;
  • the motor housing assembly including an electromagnetic shield and at least a motor coil partially located within the electromagnetic shield;
  • the motor casing assembly includes a controller for independently controlling the urea pump and the urea nozzle, the controller including a circuit board, the motor coil and the motor The nozzle coils are each 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, and the connector
  • the circuit board is electrically connected, the circuit board is mounted with a plurality of electronic components, and the motor casing assembly further includes a heat dissipation pad covering 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 pump housing assembly includes a first housing, the first housing including a first upper surface, a first lower surface, and a first side, wherein the first upper surface a first annular groove, a first island portion surrounded by the first annular groove, and a first sealing ring received in the first annular groove, the plate portion pressing down against the first seal a first positioning hole penetrating the first lower surface and a second positioning hole penetrating the first lower surface, the urea pump including the first positioning hole a first bushing and a second bushing received in the second positioning hole, wherein the first gear shaft is inserted into the first bushing, and the second gear shaft is inserted into the second bushing in.
  • 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 delivery system includes a fluid pump and a filter located upstream of the fluid pump;
  • the common rail includes a high pressure chamber connected to the fluid pump, and a low pressure connected to the urea tank a chamber and a pressure relief valve connected between the high pressure chamber and the low pressure chamber, the inlet passage being connected to the high pressure chamber.
  • the common rail includes a throttle element connected to the high pressure chamber;
  • the nozzle assembly includes a nozzle assembly and a base sleeved outside the nozzle assembly,
  • the base is provided with a mounting groove, a first cooling passage, a second cooling passage spaced apart from the first cooling passage, and an end cover sealed at a periphery of the mounting groove, the nozzle assembly being at the end cover
  • An annular cooling groove communicating with the first cooling passage and the second cooling passage is formed between the second sleeves, the first cooling passage is connected to the inlet joint, the downstream of the throttling element and the inlet
  • the joint is connected for injection of a urea solution, the second cooling passage is connected to an outlet joint, and the outlet joint is connected to the low pressure chamber.
  • the integrated devices are at least two and arranged in parallel.
  • 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 motor coil and the nozzle coil by controlling the motor coil and the nozzle coil, mutual interference between the pump and the nozzle is avoided, and the accuracy of the control is improved.
  • 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.
  • By setting the common rail it is possible to better stabilize the system pressure and improve the injection accuracy.
  • 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 an exhaust aftertreatment system of the present invention in another embodiment.
  • the present invention discloses an exhaust aftertreatment system 100 that can be applied to treat exhaust gas from engine 10 to reduce emissions of hazardous materials to meet emission regulations.
  • the exhaust aftertreatment system 100 includes an exhaust system for exhaust gas aftertreatment The system 200 and the exhaust aftertreatment package system 300, wherein the injection system 200 includes a urea solution (shown by arrow X) for pumping from the urea tank 201 and intake or exhaust to the engine 10 (eg, An integrated device 1 for injecting a urea solution into the exhaust pipe 106 or within the packaging system 300; the packaging system 300 includes a mixer 301 downstream of the integrated device 1 and a carrier 302 located downstream of the mixer 301.
  • the mixer may not be provided, or two or more mixers may be provided.
  • the carrier 302 can be, for example, a selective catalytic reduction (SCR) or the like.
  • 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. It will be appreciated that the controller 13 may be integrated with or separate from the integrated device 1. Referring to FIG. 2, in the illustrated embodiment of the present invention, 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. Body and A second housing mating 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 will be understood that the inlet passage 15 is located upstream of the urea pump 11 as an opposite "low pressure passage”; the outlet passage 16 is located downstream of the urea pump 11 as an opposite "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 in order to enable precise control.
  • signals from the CAN bus that are related to engine operating parameters.
  • the controller 13 can also obtain the rotational speed of the urea pump 11.
  • 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.
  • one embodiment of the illustrated embodiment of the present invention utilizes 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 cooling medium is urea.
  • 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 shield 183 It is made of metal material to reduce the interference of external factors on internal electronic components, etc., 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 includes a casing cavity 21 for covering the controller 13 and at least a portion of the pump assembly 18, a through hole 22 communicating with the casing cavity 21, and being fixed in the through hole 22. Waterproof venting cover 24.
  • 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 sealing ring 73 below the metal cover 62, And the first gear assembly 74 and the second gear assembly 75 that are in mesh with each other. 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 helps to evacuate the residual urea solution and reduce the risk of 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 connecting the first positioning hole 3121 and the second positioning hole 3122.
  • the drain 321 is vented 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. Referring to FIG. 21 and FIG. 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 inlet chamber 431 is in communication with the connection hole 3127, and the upper end of the outlet chamber 432 is in communication with the first outlet port 3123.
  • the second casing 4 is further provided with a first anti-freeze bar 441 located in the liquid inlet chamber 431 and a second anti-freeze bar located in the liquid outlet chamber 432. 442.
  • the first antifreeze bar 441 and the second antifreeze bar 442 are both compressible 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 set value of the overflow element 173, the overflow element 173 is opened, and part of the urea solution enters the liquid inlet passage 332 to Realize 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 base 190 that is sleeved outside the nozzle assembly 120.
  • the nozzle assembly 120 and the 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 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 to mount the integrated device 1 to the exhaust pipe 106 or the packaging system A plurality of first mounting holes 931 on the 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 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 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 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.
  • Figure 37 illustrates the use of several integrated devices 1 in parallel with one another in an exhaust aftertreatment system.
  • the exhaust aftertreatment system 100 includes an exhaust aftertreatment injection system and an exhaust aftertreatment packaging system 300, wherein the packaging system 300 includes a carrier 302 and a mixer 301.
  • the injection system includes a urea injection system located upstream of the carrier 302.
  • the urea injection system includes a delivery system 203 for pumping urea outwardly from the urea tank 201, a common rail 204 coupled to the delivery system 203, and at least one of the aforementioned integrated devices 1 coupled to the common rail 204.
  • the delivery system 203 includes a fluid pump 2031 and a filter 202 located upstream of the fluid pump 2031.
  • the common rail 204 includes a high pressure chamber 2041 connected to the fluid pump 2031, a low pressure chamber 2042 connected to the urea tank 201, and a pressure relief valve 2043 connected between the high pressure chamber 2041 and the low pressure chamber 2042.
  • the inlet passage 15 of the integrated device 1 is connected to the high pressure chamber 2041.
  • the common rail 204 further includes a throttling element 2044 connected to the high pressure chamber 2041, and the urea solution output after throttling is a urea solution having a lower pressure. Downstream of the throttling element 2044 is coupled to the inlet fitting 103 for injection of a urea solution; the second cooling passage 914 is coupled to an outlet fitting 104, and the outlet fitting 104 is coupled to the low pressure chamber 2042.
  • the integrated devices 1 are at least two and arranged in parallel.
  • the exhaust gas aftertreatment system can have greater processing capacity, thereby reducing the emission of harmful substances and meeting the requirements of emission regulations.
  • 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 in the integrated device 1 of the present invention is short, the pressure drop is small, and between the pump and the nozzle The dead volume 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 cooled by water or urea 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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Abstract

一种尾气后处理系统(100)，其包括尾气后处理的喷射系统(200)以及尾气后处理的封装系统(300)，其中，所述喷射系统(200)包括用以从尿素箱(201)中向外泵送尿素的输送系统(203)、与所述输送系统(203)相连的共轨(204)以及与所述共轨(204)相连的至少一个尿素泵(11)与尿素喷嘴(12)的集成装置(1)，所述集成装置(1)包括泵组件(18)以及喷嘴组件(19)，所述泵组件(18)包括电机机壳总成(181)、磁力罩组件(6)以及泵壳体总成(182)，所述电机机壳总成(181)包括电磁屏蔽罩(183)以及电机线圈(111)，所述电机机壳总成(181)与所述泵壳体总成(182)通过滚压或者焊接的方式固定在一起，所述泵壳体总成(182)包括与所述泵（11）连通的入口通道(15)以及出口通道(16)，所述出口通道(16)与所述喷嘴组件(19)相连通。所述尾气后处理系统(100)处理能力强，控制精确度较高。

Description

尾气后处理系统
本申请要求了申请日为2017年3月20日、申请号为201710164272.9、发明名称为“尾气后处理系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及一种尾气后处理系统，属于柴油发动机尾气后处理技术领域。
背景技术
随着内燃机汽车的排放标准越来越严，为了降低排气中氮氧化合物等有害物质，目前业界通常采用的后处理技术是选择性催化还原(SCR)，并在SCR的上游安装向排气中喷射尿素溶液。尿素溶液发生水解、热解产生氨气，并与氮氧化合物等发生化学反应，进而降低有害物质的浓度。
目前市场上的尿素喷射系统通常包括空气辅助系统和非空气辅助系统。当然，无论哪种系统均包括尿素箱总成、通过低压管道与所述尿素箱总成相连的泵供给单元、通过高压管道与泵供给单元相连的喷嘴模块以及控制器。泵供给单元中包括尿素泵以及压力传感器等，喷嘴模块包括尿素喷嘴等。尿素泵与尿素喷嘴间隔较远的距离，并通过尿素管相连。另外，现有的尿素喷射系统包含较多的零部件，安装复杂，成本较高。
发明内容
本发明的目的在于提供一种控制比较精确的尾气后处理系统。
为实现上述目的，本发明采用如下技术方案：
一种尾气后处理系统，其包括尾气后处理的喷射系统以及尾气后处理的封装系统，其中所述封装系统包括载体，所述喷射系统包括位于所述载体的上游的尿素喷射系统，所述尿素喷射系统包括用以从尿素箱中向外泵送尿素的输送系统、与所述输送系统相连的共轨以及与所述共轨相连的至少一个尿素泵与尿素喷嘴的集成装置，其中所述尿素泵用以向所述尿素喷嘴泵送尿素溶液，所述尿素喷嘴用以向发动机的排气中喷射尿素，所述集成装置包括壳体、至少部分安装于所述壳体内的泵组件以及与所述泵组件相配合的喷嘴组件，其中所述壳体包括位于所述泵组件的上游且与所述泵组件连通的入口通道以及位于所述泵组件的下游且与所述泵组件连通的出口通道，所述 出口通道与所述喷嘴组件连通；所述泵组件包括用以驱动所述尿素泵的电机线圈、与所述电机线圈相互作用的磁性体以及相互啮合的第一齿轮组件与第二齿轮组件，其中所述第一齿轮组件包括第一齿轮，所述第二齿轮组件包括第二齿轮，所述第一齿轮与所述第二齿轮相互啮合，所述壳体设有收容所述第一齿轮与所述第二齿轮的齿轮槽，所述齿轮槽的一侧设有与所述入口通道连通的进液腔，所述齿轮槽的另一侧设有与所述出口通道连通的出液腔；所述喷嘴组件包括用以驱动所述喷嘴的喷嘴线圈。
作为本发明进一步改进的技术方案，所述输送系统包括流体泵以及位于所述流体泵上游的过滤器。
作为本发明进一步改进的技术方案，所述共轨包括与所述流体泵相连的高压腔、与所述尿素箱相连的低压腔以及连接在所述高压腔与所述低压腔之间的泄压阀，所述入口通道与所述高压腔相连。
作为本发明进一步改进的技术方案，所述集成装置至少为两个且并联设置。
作为本发明进一步改进的技术方案，所述尾气后处理系统还包括位于所述集成装置的下游的混合器。
作为本发明进一步改进的技术方案，所述集成装置还设有对所述尿素泵以及所述尿素喷嘴分别进行独立控制的控制器，所述控制器包括电路板，所述电机线圈与所述喷嘴线圈均连接到所述电路板上。
作为本发明进一步改进的技术方案，所述集成装置包括连接在所述出口通道与所述入口通道之间的溢流元件。
本发明还涉及一种尾气后处理系统，其包括尾气后处理的喷射系统以及尾气后处理的封装系统，其中所述封装系统包括载体，所述喷射系统包括位于所述载体的上游的尿素喷射系统，所述尿素喷射系统包括用以从尿素箱中向外泵送尿素的输送系统、与所述输送系统相连的共轨以及与所述共轨相连的至少一个尿素泵与尿素喷嘴的集成装置，其中所述尿素泵用以向所述尿素喷嘴泵送尿素溶液，所述尿素喷嘴用以向发动机的排气中喷射尿素，所述集成装置包括泵组件以及喷嘴组件；所述泵组件包括电机机壳总成、至少部分位于所述电机机壳总成内的磁力罩组件以及与所述电机机壳总成相配合的泵壳体总成；所述电机机壳总成包括电磁屏蔽罩以及至少部分位于所述电磁屏蔽罩内的电机线圈；所述磁力罩组件包括至少部分插入所述电机线圈中的金属罩以及收容 于所述金属罩内的转子；所述泵壳体总成包括位于所述尿素泵的上游且与所述尿素泵连通的入口通道以及位于所述尿素泵的下游且与所述尿素泵连通的出口通道，所述出口通道与所述喷嘴组件相连通；所述泵壳体总成还包括相互啮合的第一齿轮组件与第二齿轮组件，其中所述第一齿轮组件包括第一齿轮轴以及第一齿轮，所述第二齿轮组件包括第二齿轮轴以及第二齿轮，所述第一齿轮与所述第二齿轮相互啮合，所述转子固定在所述第一齿轮轴上；所述泵壳体总成设有收容所述第一齿轮与所述第二齿轮的齿轮槽，所述齿轮槽的一侧设有与所述入口通道连通的进液腔，所述齿轮槽的另一侧设有与所述出口通道连通的出液腔；所述喷嘴组件包括用以驱动所述喷嘴的喷嘴线圈。
作为本发明进一步改进的技术方案，所述电机机壳总成包括对所述尿素泵以及所述尿素喷嘴分别进行独立控制的控制器，所述控制器包括电路板，所述电机线圈与所述喷嘴线圈均连接到所述电路板上。
作为本发明进一步改进的技术方案，所述金属罩内还设有位于所述转子的上方的抗冻体，所述抗冻体能够被压缩以吸收因尿素结冰所产生的膨胀体积。
作为本发明进一步改进的技术方案，所述泵组件还包括收容在所述金属罩内且位于所述转子下方的弹性体，所述弹性体能够被压缩以吸收因尿素结冰所产生的膨胀体积。
作为本发明进一步改进的技术方案，所述泵壳体总成还设有位于所述进液腔中的第一抗冻棒以及位于所述出液腔中的第二抗冻棒，所述第一抗冻棒与所述第二抗冻棒均能够在尿素结冰时被压缩。
作为本发明进一步改进的技术方案，所述喷嘴总成包括与所述喷嘴线圈相互作用的磁性部、至少部分收容所述磁性部的第一套筒、位于所述磁性部下方的阀针部、至少部分收容所述阀针部的第二套筒、作用在所述磁性部与所述阀针部之间的弹簧、与所述阀针部配合的阀座以及与所述阀座分开制作并贴靠在所述阀座上的旋流片，所述旋流片设有若干旋流槽。
作为本发明进一步改进的技术方案，所述喷嘴线圈位于所述磁性部的外围，所述阀针部设有阀针，所述第一套筒与所述第二套筒相固定以形成围绕在所述阀针部的外围的空间，所述阀针设有与所述空间相连通的通孔，所述第二套筒设有连通所述空间与所述旋流槽的连通槽，所述阀座设有与所述阀针相配合的喷射孔。
作为本发明进一步改进的技术方案，所述电机机壳总成设有注塑成型的接插件，所述接插件与 所述电路板电性连接，所述电路板安装有若干电子元器件，所述电机机壳总成还包括覆盖在所述电子元器件表面的散热垫。
作为本发明进一步改进的技术方案，所述磁力罩组件包括位于所述金属罩下方的板片部，所述板片部通过若干螺钉被固定在所述泵壳体总成上。
作为本发明进一步改进的技术方案，所述泵壳体总成包括第一壳体，所述第一壳体包括第一上表面、第一下表面以及第一侧面，其中所述第一上表面设有第一环形槽、被所述第一环形槽包围的第一岛部以及收容在所述第一环形槽中的第一密封圈，所述板片部向下抵压所述第一密封圈；所述第一岛部设有贯穿所述第一下表面的第一定位孔以及贯穿所述第一下表面的第二定位孔，所述尿素泵包括收容在所述第一定位孔中的第一轴套以及收容在所述第二定位孔中的第二轴套，其中所述第一齿轮轴插入所述第一轴套中，所述第二齿轮轴插入所述第二轴套中。
作为本发明进一步改进的技术方案，所述第一岛部还包括贯穿所述第一上表面且与所述第二定位孔连通的第一导流槽以及贯穿所述第一上表面且与出液腔连通的第一出口孔；所述第一上表面还设有位于所述第一岛部的旁侧且用以收容传感器的传感器收容孔，所述集成装置包括传感器用以检测温度和压力；所述第一壳体还设有与所述传感器收容孔相连通的第二出口孔。
作为本发明进一步改进的技术方案，所述第一壳体设有溢流元件收容槽，所述集成装置设有安装于所述溢流元件收容槽内的溢流元件；当所述出口通道的压力高于设定值时，所述溢流元件打开以将部分尿素溶液返回到所述入口通道内。
作为本发明进一步改进的技术方案，所述泵壳体总成包括位于所述第一壳体的下方且与所述第一壳体连接的第二壳体，所述第二壳体包括第二上表面以及第二下表面，所述齿轮槽贯穿所述第二上表面与第二下表面。
作为本发明进一步改进的技术方案，所述泵壳体总成包括位于所述第二壳体的下方且与所述第二壳体连接的第三壳体，所述第三壳体包括本体部以及自所述本体部向下延伸的凸起部，其中所述本体部设有第三上表面，所述第三上表面设有第三环形槽以及被所述第三环形槽包围的第三岛部。
作为本发明进一步改进的技术方案，所述输送系统包括流体泵以及位于所述流体泵上游的过滤器；所述共轨包括与所述流体泵相连的高压腔、与所述尿素箱相连的低压腔以及连接在所述高压腔与所述低压腔之间的泄压阀，所述入口通道与所述高压腔相连。
作为本发明进一步改进的技术方案，所述共轨包括连接在所述高压腔上的节流元件；所述喷嘴组件包括喷嘴总成以及套接在所述喷嘴总成的外部的底座，所述底座设有安装槽、第一冷却通道、与所述第一冷却通道间隔设置的第二冷却通道以及密封在所述安装槽的外围的端盖，所述喷嘴总成在所述端盖与所述第二套筒之间形成了连通所述第一冷却通道与所述第二冷却通道的环形冷却槽，所述第一冷却通道与入口接头连接，所述节流元件的下游与所述入口接头连接用以供尿素溶液注入，所述第二冷却通道与出口接头连接，所述出口接头与所述低压腔相连。
作为本发明进一步改进的技术方案，所述集成装置至少为两个且并联设置。
相较于现有技术，本发明泵与喷嘴的集成装置很好的将泵与喷嘴集成在一起，结构简单、紧凑，极大地方便了客户的安装。另外，通过对电机线圈以及喷嘴线圈进行控制，从而避免了泵与喷嘴之间的相互干扰，提高了控制的精确性。在集成装置集成了尿素泵与尿素喷嘴的基础上，由于控制精度的提高，能够使喷入排气中的尿素的量与氮氧化合物达到合适的比例，降低了因过多喷射尿素而产生的结晶风险。通过设置共轨，能够更好地稳定系统压力，提高喷射精度。
附图说明
图1是本发明的集成装置应用在处理发动机尾气时的原理图。
图2是图1中集成装置的原理图。
图3是本发明的集成装置在一种实施方式中的立体示意图。
图4是图3的俯视图。
图5是本发明集成装置的部分立体分解图，其中泵组件与喷嘴组件分离开来。
图6是本发明集成装置的部分立体分解图，其中电机机壳总成被分离出来。
图7是图6中电机机壳总成的立体示意图。
图8是图6中电机机壳总成的部分立体分解图。
图9是图8进一步的立体分解图，其中电机线圈被分离出来。
图10是去除图6中电机机壳总成后进一步的立体分解图。
图11是图10进一步的立体分解图。
图12是图11进一步的立体分解图。
图13是图12进一步的立体分解图，其中泵壳体总成、喷嘴总成、端盖等被分离出来。
图14是图13中泵壳体总成的部分立体分解图。
图15是图14中第一壳体以及其上元件的立体分解图。
图16是图15于另一角度的立体分解图。
图17是图15中第一壳体的立体图。
图18是图17于另一角度的立体图。
图19是图18的俯视图。
图20是图17的俯视图。
图21是沿图20中C-C线的剖面示意图。
图22是沿图20中D-D线的剖面示意图。
图23是沿图20中E-E线的剖面示意图。
图24是沿图20中F-F线的剖面示意图。
图25是去除图14中第一壳体后的立体示意图。
图26是图25的部分立体分解图。
图27是图25的俯视图。
图28是图25进一步的立体分解图。
图29是图13中喷嘴总成的立体图。
图30是沿图29中G-G线的剖面示意图。
图31是图29的立体分解图。
图32是图31进一步的立体分解图。
图33是沿图4中A-A线的剖面示意图。
图34是沿图4中B-B线的剖面示意图。
图35是沿图33中H-H线的剖面示意图。
图36是本发明集成装置的立体分解图。
图37是本发明的尾气后处理系统在另一实施方式中的原理图。
具体实施方式
请参图1所示，本发明揭示了一种尾气后处理系统100，能够应用于处理发动机10的尾气，降低有害物质的排放以满足排放法规的要求。所述尾气后处理系统100包括尾气后处理的喷射系 统200以及尾气后处理的封装系统300，其中所述喷射系统200包括用以从尿素箱201中泵送尿素溶液(参箭头X所示)以及向所述发动机10的进气或者排气(例如向排气管106或者封装系统300内)中喷射尿素溶液的集成装置1；所述封装系统300包括位于所述集成装置1下游的混合器301以及位于所述混合器301下游的载体302。当然，在某些实施方式中也可以不设置混合器，或者设置两个或者两个以上的混合器。所述载体302可以例如是选择性催化还原(SCR)等。
所述发动机10具有发动机冷却液循环回路。请参图1所示，在本发明图示的实施方式中，所述发动机冷却液循环回路包括第一循环回路101(参粗箭头Y所示)以及第二循环回路102(参细箭头Z所示)，其中所述第一循环回路101用以冷却所述集成装置1，以降低其被高温的发动机排气烧坏的风险；所述第二循环回路102用以加热所述尿素箱201，以实现加热解冻功能。可以理解的是，在第一循环回路101中，所述集成装置1设有供发动机冷却液流入的入口接头103以及供发动机冷却液流出的出口接头104；在第二循环回路102中，其设有控制阀105，以在适宜的条件下打开或者关闭所述控制阀105，实现对第二循环回路102的控制。所述尿素箱201中设有连接在所述第二循环回路102中的加热棒202，以利用发动机冷却液的温度对尿素溶液进行加热解冻。
以下就本发明的集成装置1进行详细描述。
请参图2所示，从原理上看，本发明的集成装置1集成了尿素泵11与尿素喷嘴12的功能。所述尿素泵11包括但不限于齿轮泵、膜片泵、柱塞泵或者叶片泵等。应该理解的是，在此使用的术语“集成”指的是尿素泵11与尿素喷嘴12可以作为单一装置被安装在进气管或者排气管上；或者尿素泵11与尿素喷嘴12相互靠近并通过较短的连接管道进行连接，在整体上可以被视为一个装置。
另外，本发明的尾气后处理系统100还设有控制器13。所述控制器13能够对尿素泵11以及尿素喷嘴12进行独立控制。可以理解，所述控制器13可以与所述集成装置1集成在一起或者与所述集成装置1分开设置。请参图2所示，在本发明图示的实施方式中，所述控制器13集成在所述集成装置1内，以实现零件的高度集成化，提高客户端的安装便利性。
所述集成装置1设有用以容纳所述尿素泵11与所述尿素喷嘴12的壳体14。图2所示的实施方式仅是对壳体14的粗略显示。例如，在一种实施方式中，所述壳体14由尿素泵11以及尿素喷嘴12共享；在另一种实施方式中，所述壳体14被区分为与尿素泵11相配合的第一壳体以及 与尿素喷嘴12相配合的第二壳体，第一壳体与第二壳体装配在一起，以形成一个整体。当然，在其他的实施方式中，所述壳体14也可以被分成若干个以与尿素泵11及/或尿素喷嘴12相配合。所述壳体14设有连接在所述尿素箱201与所述尿素泵11之间的入口通道15以及连接在所述尿素泵11与所述尿素喷嘴12之间的出口通道16。需要说明的是，这里使用的术语“入口通道15”中的“入口”与“出口通道16”中的“出口”是以尿素泵11作为参照，即尿素泵11的上游为入口，尿素泵11的下游为出口。所述出口通道16与所述尿素喷嘴12连通，以向所述尿素喷嘴12泵送尿素溶液。可以理解的是，所述入口通道15位于尿素泵11的上游，为相对的“低压通道”；所述出口通道16位于尿素泵11的下游，为相对的“高压通道”。
另外，所述集成装置1设有用以检测温度的温度传感器。所述温度传感器可以被设置为与所述入口通道15及/或所述出口通道16连通；或者所述温度传感器可以被设置为安装在所述集成装置1的任意位置。所述温度传感器检测到的信号传递给控制器13，控制器13基于该输入信号以及其他信号所设计的控制算法能够提高尿素喷嘴12的喷射精度。所述集成装置1还设有用以检测压力的压力传感器，所述压力传感器与所述出口通道16连通，以检测尿素泵11出口的高压通道中的压力。由于本发明的集成设计，内部通道的距离比较短，因此可以认为所述压力传感器的位置比较靠近所述尿素喷嘴12。这种设计的优点在于压力传感器所测得的压力比较接近尿素喷嘴12中的压力，提高了数据的精确性，进而提高了尿素喷嘴12的喷射精度。在本发明的一种实施方式中，所述温度传感器与所述压力传感器为两个元件；在在本发明的另一种实施方式中，所述温度传感器与所述压力传感器为一个元件(即传感器174，容后详述)，但是同时具有检测温度与压力的功能。
请参图2所示，所述集成装置1还设有连接在所述出口通道16与所述入口通道15之间的溢流元件173。所述溢流元件173包括但不限于溢流阀、安全阀或者电控阀等。所述溢流元件173的功能是当高压通道中的压力高于设定值时，将所述溢流元件173打开，将位于高压通道中的尿素溶液释放到低压通道中或者直接返回到所述尿素箱201中，以实现压力调节。
为了驱动尿素泵11，所述尿素泵11设有与所述控制器13进行通讯的电机线圈111。为了驱动尿素喷嘴12，所述尿素喷嘴12设有与所述控制器13进行通讯的喷嘴线圈121。
所述控制器13与所述温度传感器以及所述压力传感器进行通讯，以将温度信号以及压力信号传送给所述控制器13。当然，为了能够实现精确控制，所述控制器13还可以接收其他信号， 例如来自CAN总线的、与发动机运行参数有关的信号。另外，所述控制器13还可以获得所述尿素泵11的转速，当然，转速信号的采集可以通过相应的转速传感器175(硬件)或者通过控制算法(软件)来实现。所述控制器13分别对所述尿素泵11以及所述尿素喷嘴12进行独立控制。这种控制的优点在于能够降低尿素泵11的动作对尿素喷嘴12的影响，以实现比较高的控制精度。
另外，在某些工况下，由于发动机的排气具有较高的温度，而尿素喷嘴12一般情况下又是安装在排气管上的，因此需要对所述尿素喷嘴12进行冷却及/或隔热。所述集成装置1为此还设有冷却组件，所述冷却组件通过冷却介质对所述尿素喷嘴12进行冷却。所述冷却介质包括但不限于空气、及/或发动机冷却液、及/或润滑油、及/或尿素等。请参图2所示，本发明图示的一种实施方式采用水冷，即采用发动机冷却液对尿素喷嘴12进行冷却。壳体14内设有用以供发动机冷却液流通的冷却通道141。当然，在图37所示的另一种实施方式中，所述冷却介质是尿素。请参图1所示，在本发明图示的实施方式中，所述集成装置1还设有安装在所述排气管106上的安装座107以及与所述安装座107固定在一起的隔热罩109。
请参图2所示，所述集成装置1的主要工作原理如下：
控制器13驱动尿素泵11运转，位于尿素箱201中尿素溶液通过入口通道15被吸入尿素泵11，经过加压之后，再通过出口通道16输送至尿素喷嘴12。其中，控制器13采集及/或计算需要的信号，例如温度、压力、泵转速等。当达到喷射条件时，控制器13发出控制信号给尿素喷嘴12，例如给喷嘴线圈121通电，通过控制阀针的运动来实现尿素喷射。控制器13发出控制信号给尿素泵11以控制其转速，从而稳定系统的压力。在本发明图示的实施方式中，所述控制器13分别对所述尿素泵11以及所述尿素喷嘴12进行独立控制。
请参图3至图36所示，从结构上看，本发明图示的实施方式中，所述集成装置1包括泵组件18以及喷嘴组件19。请参图5所示，所述喷嘴组件19至少部分插入到所述泵组件18中，并焊接固定到一起。
请参图3至图5所示，在本发明图示的实施方式中，所述泵组件18包括电机机壳总成181、至少部分位于所述电机机壳总成181内的磁力罩组件6以及与所述电机机壳总成181相配合的泵壳体总成182。
请参图7至图10所示，所述电机机壳总成181包括电磁屏蔽罩183、至少部分位于所述电磁屏蔽罩183内的电机线圈111以及控制器13。在本发明图示的实施方式中，所述电磁屏蔽罩183 是由金属材料制成以降低外界因素对内部电子元器件等的干扰，同时也能降低内部电子元器件对外部其他电子设备的影响。所述电机机壳总成181还包括注塑成型在外围的罩壳2。所述罩壳2包括用以遮盖所述控制器13以及至少部分泵组件18的罩壳腔体21、与所述罩壳腔体21连通的通孔22以及固定在所述通孔22中的防水透气盖24。所述电机线圈111与控制器13电性连接。在本发明图示的实施方式中，所述控制器13包括其上布置有若干电子元器件的电路板131。电子元器件在工作时会发热，导致其周围的空气膨胀，本发明通过设置防水透气盖24很好地解决了因空气膨胀而压坏芯片及/或电子元器件的问题，同时也能起到防水的功效。另外，所述防水透气盖24能够改善控制器13所处的环境，使其能够满足工作条件。
在本发明图示的实施方式中，所述电路板131呈环状，其设有位于中部的中心孔135。所述罩壳2上注塑成型有与所述电路板131连接的接插件132。另外，所述电机机壳总成181还包括覆盖在所述电子元器件表面的散热垫130。如此设置，通过散热垫130能够把电子元器件的温度均匀化，从而避免因局部过热而烧坏电子元器件。
所述磁力罩组件6包括至少部分插入所述电机线圈111中的金属罩62、位于所述金属罩62下方的板片部61以及收容于所述金属罩62内的转子72等。其中所述金属罩62向上突出于所述板片部61。所述金属罩62向上穿过所述电路板131的中心孔135，并至少部分插入电机线圈111中。请参图10所示，所述板片部61通过若干螺钉133拧紧在泵壳体总成182上，以对所述磁力罩组件6进行固定。另外，所述金属罩62内还设有位于所述转子72的上方的抗冻体70，所述抗冻体70能够在尿素结冰时被压缩，吸收膨胀体积，从而避免被冻坏。在本发明图示的实施方式中，所述抗冻体70被安装在一个套筒中，套筒再与金属罩62的顶部进行滚压，从而进行固定。所述泵组件18还包括收容在所述金属罩62内且位于所述转子72下方的弹性体71，所述弹性体71也能够被压缩以吸收因尿素结冰所产生的膨胀体积。请参图34所示，所述电机线圈111套接在所述金属罩62的外围。
所述泵壳体总成182包括上下依次堆叠在一起的第一壳体3、第二壳体4以及第三壳体5。在本发明图示的实施方式中，所述第一壳体3、第二壳体4以及第三壳体5均由金属材料制成。所述壳体14包括所述第一壳体3、第二壳体4以及第三壳体5。
在本发明图示的实施方式中，所述尿素泵11为齿轮泵，其包括所述电机线圈111、所述金属罩62、位于所述金属罩62内的弹性体71与转子72、位于所述金属罩62下方的第一密封圈73、 以及相互啮合的第一齿轮组件74与第二齿轮组件75等。由于齿轮泵能够建立比较大的工作压力，因此有利于提高尿素喷嘴12的流量。另外，齿轮泵还能够反转，利于抽空残留的尿素溶液，降低尿素结晶的风险。
请参图14至图28所示，在本发明图示的实施方式中，所述第一壳体3、第二壳体4以及第三壳体5是机加工件，并通过螺栓66固定在一起。所述第一壳体3设有位于侧面的卡槽34以及卡持在所述卡槽34中的O形密封圈35。在本发明图示的实施方式中，所述第一壳体3与电机机壳总成181通过滚压或者焊接的方式固定在一起，并通过O形密封圈35进行活塞密封。
所述第一壳体3包括第一上表面31、第一下表面32以及第一侧面33，其中所述第一上表面31设有第一环形槽311以及被所述第一环形槽311包围的第一岛部312。所述第一环形槽311用以收容所述第一密封圈73。所述板片部61向下压住所述第一密封圈73以实现密封。所述第一下表面32设有第二环形槽325以及被所述第二环形槽325包围的第二岛部326。所述第二环形槽325用以收容第二密封圈731(如图16所示)。
所述第一岛部312设有贯穿所述第一下表面32的第一定位孔3121、贯穿所述第一下表面32的第二定位孔3122、贯穿所述第一上表面31且与所述出口通道16连通的第一出口孔3123、以及贯穿所述第一上表面31且与所述第二定位孔3122连通的第一导流槽3124。所述尿素泵11设有收容在所述第一定位孔3121内的第一轴套76以及收容在所述第二定位孔3122内的第二轴套77。所述第一壳体3还包括供螺栓66穿过的若干第一组装孔318，所述第一组装孔318贯穿所述第一上表面31与所述第一下表面32。所述第一上表面31还设有位于所述第一岛部312旁侧且用以收容传感器174的传感器收容孔313，所述传感器174同时具有检测温度与压力的功能。所述第一壳体3还设有连通所述出口通道16与所述传感器收容孔313的第二出口孔3125。
另外，请参图24所示，所述第一壳体3设有贯穿所述第一侧面33以与尿素接头331连接的进液通道332。请参图15、图16及图34所示，所述尿素接头331包括靠近外侧的过滤网3311以及靠近内侧的抗冻元件3312，其中所述过滤网3311能够对尿素溶液中的杂质进行过滤，所述抗冻元件3312能够在尿素结冰时吸收膨胀体积，从而降低被冻坏的风险。所述第一壳体3设有贯穿所述第一下表面32且与所述进液通道332连通的连接孔3127。第一出口孔3123与连接孔3127均垂直于进液通道332。所述第一定位孔3121、第二定位孔3122、连接孔3127均向下贯穿第二岛部326。所述第一下表面32设有连通所述第一定位孔3121与所述第二定位孔3122的第一 泄荷槽321，以确保压力平衡。所述第一泄荷槽321位于第二岛部326上。另外，所述第一壳体3还设有向下贯穿所述第一下表面32的收容腔322，用以收容至少部分的所述喷嘴组件19。请参图21及图22所示，所述收容腔322与所述传感器收容孔313连通。同时，所述收容腔322也与第二出口孔3125连通。在本发明图示的实施方式中，第二出口孔3125在所述第一壳体3的内部是倾斜的。
另外，请参图14至图16、图22以及图24所示，所述第一壳体3还设有与进液通道332以及收容腔322连通的溢流元件收容槽319。所述溢流元件收容槽319向外贯穿第一侧面33，以收容所述溢流元件173。所述溢流元件173在本发明图示的实施方式中为安全阀，其目的是通过泄压的方式以确保所述集成装置1中高压通道中的压力处于安全值范围内。为了固定所述溢流元件173，所述第一壳体3设有固定所述溢流元件173的塞子5122。
请参图1所示，所述尿素接头331通过尿素连接管333与所述尿素箱201连通。为了更好的实现加热解冻功能，所述尾气后处理系统100还可以设有对所述尿素连接管333进行加热的加热装置334。请参图24所示，在本发明图示的实施方式中，所述进液通道332水平延伸入所述第一壳体3的内部。当然，在其他实施方式中，所述进液通道332也可以呈一定的角度。
请参图25至图27所示，所述第一齿轮组件74包括第一齿轮轴741以及固定在第一齿轮轴741上的第一齿轮742；所述第二齿轮组件75包括第二齿轮轴751以及固定在第二齿轮轴751上的第二齿轮752，所述第一齿轮742与所述第二齿轮752相互啮合。请参图25至图27所示，在本发明图示的实施方式中，所述第一齿轮742与所述第二齿轮752外啮合。另外，所述第一齿轮轴741为主动轴，所述第二齿轮轴751为从动轴，所述第一齿轮轴741高于所述第二齿轮轴751。所述第一齿轮轴741的上端穿过所述第一轴套76并与转子72进行固定。所述第二齿轮轴751的上端定位在所述第二轴套77中。当给电机线圈111通电时，其与磁性体72产生相互作用，电磁力会驱动第一齿轮轴741旋转，并由此带动第一齿轮742以及第二齿轮752旋转。
请参图25至图28所示，所述第二壳体4位于所述第一壳体3的下方且与第一壳体3相连接。另外，为了更好的定位，所述第一壳体3与所述第二壳体4之间还设有若干定位销328。所述第二壳体4包括第二上表面41、第二下表面42以及贯穿所述第二上表面41与第二下表面42且用以收容所述第一齿轮742以及第二齿轮752的齿轮槽43。所述齿轮槽43的一侧设有与入口通道15连通的进液腔431，所述齿轮槽43的另一侧设有与所述出口通道16连通的出液腔432。具体 地，进液腔431与连接孔3127连通，出液腔432的上端与第一出口孔3123连通。另外，为了提高产品的抗冻性能，所述第二壳体4还设有位于所述进液腔431中的第一抗冻棒441以及位于所述出液腔432中的第二抗冻棒442，所述第一抗冻棒441与所述第二抗冻棒442均能够在尿素结冰时被压缩。
另外，第二壳体4还设有供至少部分所述喷嘴组件19穿过的容纳孔411。所述喷嘴组件19向上部分凸出所述第二上表面41并收容在所述收容腔322中。如此设置，高压的尿素溶液能够被输送到尿素喷嘴12。所述第二壳体4还包括与所述第一组装孔318对齐的若干第二组装孔418。
请参图28所示，所述第三壳体5位于所述第二壳体4的下方且与第二壳体4相连接。所述第三壳体5包括本体部51、自本体部51向下延伸的凸起部52以及自所述本体部51向外延伸的法兰53，其中所述法兰53设有与所述第二组装孔418对齐的若干第三组装孔531，用以供螺栓66穿过。所述本体部51设有第三上表面511，所述第三上表面511设有第三环形槽512以及被所述第三环形槽512包围的第三岛部513。所述第三环形槽512用以收容第三密封圈732(如图33所示)。第三岛部513设有贯穿第三上表面511的第三定位孔5111以及贯穿第三上表面511的第四定位孔5112。所述第三壳体5设有收容于所述第三定位孔5111中的第三轴套78以及收容于所述第四定位孔5112内的第四轴套79。所述第一齿轮轴741的下端定位在第三轴套78中，所述第二齿轮轴751的下端定位在所述第四轴套79中。
另外，所述第三岛部513还设有位于所述第三上表面511的第二导流槽5114以及第三导流槽5115，其中所述第二导流槽5114与第三定位孔5111连通，第三导流槽5115与第四定位孔5112连通。所述第二导流槽5114与第三导流槽5115在第三壳体5的内部是倾斜设置的。在竖直方向上，所述第二导流槽5114与所述第三导流槽5115均与所述出液腔432相连通，如此设置，以确保尿素溶液能够进入第三定位孔5111以及第四定位孔5112中以对第三轴套78以及第四轴套79进行润滑。
工作时，尿素溶液自所述尿素连接管333进入进液通道332，并通过连接孔3127进入进液腔431中；经过齿轮泵的加压之后，一部分高压的尿素溶液向上穿过第一出口孔3123并进入到金属罩62中，另一部分高压的尿素溶液向下进入第二导流槽5114以及第三导流槽5115中；位于金属罩62内的尿素溶液的一部分自第一导流槽3124进入第二轴套77中，再通过第一泄荷槽321进入第一轴套76中，以提高齿轮泵转动的平稳性，减小磨损；位于金属罩62内的另一部分尿素 溶液自第二出口孔3125进入到收容腔322中以流向喷嘴组件19，同时一部分尿素溶液流向溢流元件173。当压力小于溢流元件173的设定值时，溢流元件173关闭；而当压力大于溢流元件173的设定值时，溢流元件173打开，部分尿素溶液进入进液通道332中，以实现泄压。
可以理解，在本发明图示的实施方式中，入口通道15包括进液通道332、连接孔3127以及进液腔431。因为所述入口通道15位于尿素泵11的上游，所以被称之为低压通道。所述出口通道16包括出液腔432、第一出口孔3123、第二出口孔3125、收容腔322等。因为所述出口通道16位于尿素泵11的下游，所以被称之为高压通道。
请参图29至图36所示，所述喷嘴组件19包括喷嘴总成120以及套接在所述喷嘴总成120的外部的底座190。在本发明图示的实施方式中，所述喷嘴总成120与底座190共同构成了尿素喷嘴12。
请参图29至图32所示，在本发明图示的实施方式中，所述喷嘴总成120包括喷嘴线圈121、与所述喷嘴线圈121相互作用的磁性部81、位于所述磁性部81下方的阀针部82、作用在所述磁性部81与所述阀针部82之间的弹簧83以及与所述阀针部82配合的阀座84(参图30所示)等。其中，所述喷嘴线圈121位于所述磁性部81的外围，所述喷嘴总成120还包括至少部分收容所述磁性部81的第一套筒811以及至少部分收容所述阀针部82的第二套筒812。另外，所述喷嘴总成120还包括套接在所述喷嘴线圈121外围的套筒部122。所述弹簧83安装在所述磁性部81与所述阀针部82内。所述阀针部82设有锥形部821以及自所述锥形部821向下延伸的阀针822。
所述第一套筒811与所述第二套筒812固定在一起以形成围绕在所述阀针部82的外围的空间813，所述阀针822设有与所述空间813相连通的通孔814。所述喷嘴总成120还包括与所述阀座84分开制作并贴靠在所述阀座84上的旋流片85，所述旋流片85设有若干旋流槽851。所述第二套筒812设有连通所述空间813与所述旋流槽851的连通槽815。所述阀座84设有与所述阀针822相配合的喷射孔841。
请参图30所示，所述磁性部81的上端套接有第四密封圈816以与所述收容腔322的内壁实现密封。另外，所述喷嘴总成120还包括与所述喷嘴线圈121连接的端子封装部86，所述端子封装部86上套接有第五密封圈817。
所述底座190包括主体部91、向下贯穿所述主体部91的安装槽92以及自所述主体部91向外延伸的安装法兰93。所述安装法兰93设有将所述集成装置1安装到排气管106或者封装系统 300上的若干第一安装孔931。所述主体部91设有第四上表面911以及第四侧面912。所述第四上表面911设有收容所述尿素喷嘴12的容纳腔94以及收容凸起部52的凹槽95。
位于底座190内的冷却通道141包括贯穿所述第四侧面912的第一冷却通道913以及与所述第一冷却通道913间隔设置的第二冷却通道914。其中，所述第一冷却通道913与所述入口接头103连通，所述第二冷却通道914与所述出口接头104连通。所述底座190设有密封在安装槽92的外围的端盖96(参图33所示)。在本发明图示的实施方式中，所述端盖96焊接在安装槽92内。如此设置，所述底座190在端盖96与所述第二套筒812之间形成了连通第一冷却通道914与第二冷却通道915的环形冷却槽916。
在本发明图示的实施方式中，所述安装法兰93与主体部91一体机加工形成。当然，在其他实施方式中，所述安装法兰93也可以与所述主体部91分开制作，然后焊接在一起。
图37揭示了一种相互并联的若干集成装置1在尾气后处理系统中的应用。在该实施方式中，所述尾气后处理系统100包括尾气后处理的喷射系统以及尾气后处理的封装系统300，其中所述封装系统300包括载体302以及混合器301。所述喷射系统包括位于所述载体302的上游的尿素喷射系统。所述尿素喷射系统包括用以从尿素箱201中向外泵送尿素的输送系统203、与所述输送系统203相连的共轨204以及与所述共轨204相连的至少一个前述集成装置1。所述输送系统203包括流体泵2031以及位于所述流体泵2031上游的过滤器202。所述共轨204包括与所述流体泵2031相连的高压腔2041、与所述尿素箱201相连的低压腔2042以及连接在所述高压腔2041与所述低压腔2042之间的泄压阀2043，所述集成装置1的入口通道15与所述高压腔2041相连。所述共轨204还包括连接在所述高压腔2041上的节流元件2044，节流后输出的尿素溶液为压力较低的尿素溶液。所述节流元件2044的下游与所述入口接头103连接，用以供尿素溶液注入；所述第二冷却通道914与出口接头104连接，所述出口接头104与所述低压腔2042相连。
优选地，所述集成装置1至少为两个且并联设置。如此设置，该尾气后处理系统能够具备更大的处理能力，从而降低有害物质的排放，满足排放法规的要求。
相较于现有技术，本发明的集成装置1是一种集成化的设计，可以省去或缩短现有技术中用以连接泵与喷嘴的尿素管，也可以省去现有技术的泵供给单元中各种传感器与线束之间的插接件，也可以无需加热解冻装置，因此可靠性较高。本发明的集成装置1结构紧凑，体积小，便于各种车型的安装。另外，本发明的集成装置1中内部流体介质通道较短，压降小，泵与喷嘴之间 的死容积小，效率较高。传感器174离喷嘴近，喷射压力精度高。另外，通过分别对泵以及喷嘴进行独立控制，避免了喷嘴的动作是由泵的动作所驱动，从而提高了控制的精确度。由于喷嘴的喷射精度提高了，从而能够使喷入排气中的尿素的量与氮氧化合物达到合适的比例，降低了因过多喷射尿素而产生的结晶风险。本发明的集成装置1可以采用水冷或尿素冷却，使残留在集成装置1中的尿素温度达不到结晶点，不易产生结晶。
以上实施例仅用于说明本发明而并非限制本发明所描述的技术方案，对本说明书的理解应该以所属技术领域的技术人员为基础，尽管本说明书参照上述的实施例对本发明已进行了详细的说明，但是，本领域的普通技术人员应当理解，所属技术领域的技术人员仍然可以对本发明进行修改或者等同替换，而一切不脱离本发明的精神和范围的技术方案及其改进，均应涵盖在本发明的权利要求范围内。

Claims (24)

  1. 一种尾气后处理系统，其包括尾气后处理的喷射系统以及尾气后处理的封装系统，其中所述封装系统包括载体，所述喷射系统包括位于所述载体的上游的尿素喷射系统，所述尿素喷射系统包括用以从尿素箱中向外泵送尿素的输送系统、与所述输送系统相连的共轨以及与所述共轨相连的至少一个尿素泵与尿素喷嘴的集成装置，其中所述尿素泵用以向所述尿素喷嘴泵送尿素溶液，所述尿素喷嘴用以向发动机的排气中喷射尿素，其特征在于：所述集成装置包括壳体、至少部分安装于所述壳体内的泵组件以及与所述泵组件相配合的喷嘴组件，其中所述壳体包括位于所述泵组件的上游且与所述泵组件连通的入口通道以及位于所述泵组件的下游且与所述泵组件连通的出口通道，所述出口通道与所述喷嘴组件连通；所述泵组件包括用以驱动所述尿素泵的电机线圈、与所述电机线圈相互作用的磁性体以及相互啮合的第一齿轮组件与第二齿轮组件，其中所述第一齿轮组件包括第一齿轮，所述第二齿轮组件包括第二齿轮，所述第一齿轮与所述第二齿轮相互啮合，所述壳体设有收容所述第一齿轮与所述第二齿轮的齿轮槽，所述齿轮槽的一侧设有与所述入口通道连通的进液腔，所述齿轮槽的另一侧设有与所述出口通道连通的出液腔；所述喷嘴组件包括用以驱动所述喷嘴的喷嘴线圈。
  2. 如权利要求1所述的尾气后处理系统，其特征在于：所述输送系统包括流体泵以及位于所述流体泵上游的过滤器。
  3. 如权利要求1所述的尾气后处理系统，其特征在于：所述共轨包括与所述流体泵相连的高压腔、与所述尿素箱相连的低压腔以及连接在所述高压腔与所述低压腔之间的泄压阀，所述入口通道与所述高压腔相连。
  4. 如权利要求1所述的尾气后处理系统，其特征在于：所述集成装置至少为两个且并联设置。
  5. 如权利要求1所述的尾气后处理系统，其特征在于：所述尾气后处理系统还包括位于所述集成装置的下游的混合器。
  6. 如权利要求1所述的尾气后处理系统，其特征在于：所述集成装置还设有对所述尿素泵以及所述尿素喷嘴分别进行独立控制的控制器，所述控制器包括电路板，所述电机线圈与所述喷嘴 线圈均连接到所述电路板上。
  7. 如权利要求1所述的尾气后处理系统，其特征在于：所述集成装置包括连接在所述出口通道与所述入口通道之间的溢流元件。
  8. 一种尾气后处理系统，其包括尾气后处理的喷射系统以及尾气后处理的封装系统，其中所述封装系统包括载体，所述喷射系统包括位于所述载体的上游的尿素喷射系统，所述尿素喷射系统包括用以从尿素箱中向外泵送尿素的输送系统、与所述输送系统相连的共轨以及与所述共轨相连的至少一个尿素泵与尿素喷嘴的集成装置，其中所述尿素泵用以向所述尿素喷嘴泵送尿素溶液，所述尿素喷嘴用以向发动机的排气中喷射尿素，其特征在于：所述集成装置包括泵组件以及喷嘴组件；所述泵组件包括电机机壳总成、至少部分位于所述电机机壳总成内的磁力罩组件以及与所述电机机壳总成相配合的泵壳体总成；所述电机机壳总成包括电磁屏蔽罩以及至少部分位于所述电磁屏蔽罩内的电机线圈；所述磁力罩组件包括至少部分插入所述电机线圈中的金属罩以及收容于所述金属罩内的转子；所述泵壳体总成包括位于所述尿素泵的上游且与所述尿素泵连通的入口通道以及位于所述尿素泵的下游且与所述尿素泵连通的出口通道，所述出口通道与所述喷嘴组件相连通；所述泵壳体总成还包括相互啮合的第一齿轮组件与第二齿轮组件，其中所述第一齿轮组件包括第一齿轮轴以及第一齿轮，所述第二齿轮组件包括第二齿轮轴以及第二齿轮，所述第一齿轮与所述第二齿轮相互啮合，所述转子固定在所述第一齿轮轴上；所述泵壳体总成设有收容所述第一齿轮与所述第二齿轮的齿轮槽，所述齿轮槽的一侧设有与所述入口通道连通的进液腔，所述齿轮槽的另一侧设有与所述出口通道连通的出液腔；所述喷嘴组件包括用以驱动所述喷嘴的喷嘴线圈。
  9. 如权利要求8所述的尾气后处理系统，其特征在于：所述电机机壳总成包括对所述尿素泵以及所述尿素喷嘴分别进行独立控制的控制器，所述控制器包括电路板，所述电机线圈与所述喷嘴线圈均连接到所述电路板上。
  10. 如权利要求8所述的尾气后处理系统，其特征在于：所述金属罩内还设有位于所述转子的上方的抗冻体，所述抗冻体能够被压缩以吸收因尿素结冰所产生的膨胀体积。
  11. 如权利要求10所述的尾气后处理系统，其特征在于：所述泵组件还包括收容在所述金属 罩内且位于所述转子下方的弹性体，所述弹性体能够被压缩以吸收因尿素结冰所产生的膨胀体积。
  12. 如权利要求8所述的尾气后处理系统，其特征在于：所述泵壳体总成还设有位于所述进液腔中的第一抗冻棒以及位于所述出液腔中的第二抗冻棒，所述第一抗冻棒与所述第二抗冻棒均能够在尿素结冰时被压缩。
  13. 如权利要求8所述的尾气后处理系统，其特征在于：所述喷嘴总成包括与所述喷嘴线圈相互作用的磁性部、至少部分收容所述磁性部的第一套筒、位于所述磁性部下方的阀针部、至少部分收容所述阀针部的第二套筒、作用在所述磁性部与所述阀针部之间的弹簧、与所述阀针部配合的阀座以及与所述阀座分开制作并贴靠在所述阀座上的旋流片，所述旋流片设有若干旋流槽。
  14. 如权利要求13所述的尾气后处理系统，其特征在于：所述喷嘴线圈位于所述磁性部的外围，所述阀针部设有阀针，所述第一套筒与所述第二套筒相固定以形成围绕在所述阀针部的外围的空间，所述阀针设有与所述空间相连通的通孔，所述第二套筒设有连通所述空间与所述旋流槽的连通槽，所述阀座设有与所述阀针相配合的喷射孔。
  15. 如权利要求8所述的尾气后处理系统，其特征在于：所述电机机壳总成设有注塑成型的接插件，所述接插件与所述电路板电性连接，所述电路板安装有若干电子元器件，所述电机机壳总成还包括覆盖在所述电子元器件表面的散热垫。
  16. 如权利要求8所述的尾气后处理系统，其特征在于：所述磁力罩组件包括位于所述金属罩下方的板片部，所述板片部通过若干螺钉被固定在所述泵壳体总成上。
  17. 如权利要求16所述的尾气后处理系统，其特征在于：所述泵壳体总成包括第一壳体，所述第一壳体包括第一上表面、第一下表面以及第一侧面，其中所述第一上表面设有第一环形槽、被所述第一环形槽包围的第一岛部以及收容在所述第一环形槽中的第一密封圈，所述板片部向下抵压所述第一密封圈；所述第一岛部设有贯穿所述第一下表面的第一定位孔以及贯穿所述第一下表面的第二定位孔，所述尿素泵包括收容在所述第一定位孔中的第一轴套以及收容在所述第二定位孔中的第二轴套，其中所述第一齿轮轴插入所述第一轴套中，所述第二齿轮轴插入所述第二轴套中。
  18. 如权利要求17所述的尾气后处理系统，其特征在于：所述第一岛部还包括贯穿所述第一上表面且与所述第二定位孔连通的第一导流槽以及贯穿所述第一上表面且与出液腔连通的第一出口孔；所述第一上表面还设有位于所述第一岛部的旁侧且用以收容传感器的传感器收容孔，所述集成装置包括传感器用以检测温度和压力；所述第一壳体还设有与所述传感器收容孔相连通的第二出口孔。
  19. 如权利要求18所述的尾气后处理系统，其特征在于：所述第一壳体设有溢流元件收容槽，所述集成装置设有安装于所述溢流元件收容槽内的溢流元件；当所述出口通道的压力高于设定值时，所述溢流元件打开以将部分尿素溶液返回到所述入口通道内。
  20. 如权利要求17所述的尾气后处理系统，其特征在于：所述泵壳体总成包括位于所述第一壳体的下方且与所述第一壳体连接的第二壳体，所述第二壳体包括第二上表面以及第二下表面，所述齿轮槽贯穿所述第二上表面与第二下表面。
  21. 如权利要求20所述的尾气后处理系统，其特征在于：所述泵壳体总成包括位于所述第二壳体的下方且与所述第二壳体连接的第三壳体，所述第三壳体包括本体部以及自所述本体部向下延伸的凸起部，其中所述本体部设有第三上表面，所述第三上表面设有第三环形槽以及被所述第三环形槽包围的第三岛部。
  22. 如权利要求14所述的尾气后处理系统，其特征在于：所述输送系统包括流体泵以及位于所述流体泵上游的过滤器；所述共轨包括与所述流体泵相连的高压腔、与所述尿素箱相连的低压腔以及连接在所述高压腔与所述低压腔之间的泄压阀，所述入口通道与所述高压腔相连。
  23. 如权利要求22所述的尾气后处理系统，其特征在于：所述共轨包括连接在所述高压腔上的节流元件；所述喷嘴组件包括喷嘴总成以及套接在所述喷嘴总成的外部的底座，所述底座设有安装槽、第一冷却通道、与所述第一冷却通道间隔设置的第二冷却通道以及密封在所述安装槽的外围的端盖，所述喷嘴总成在所述端盖与所述第二套筒之间形成了连通所述第一冷却通道与所述第二冷却通道的环形冷却槽，所述第一冷却通道与入口接头连接，所述节流元件的下游与所述入口接头连接用以供尿素溶液注入，所述第二冷却通道与出口接头连接，所述出口接头与所述低压腔相连。
  24. 如权利要求8所述的尾气后处理系统，其特征在于：所述集成装置至少为两个且并联设 置。
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