WO2016095808A1 - 尿素喷射系统 - Google Patents

尿素喷射系统 Download PDF

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Publication number
WO2016095808A1
WO2016095808A1 PCT/CN2015/097422 CN2015097422W WO2016095808A1 WO 2016095808 A1 WO2016095808 A1 WO 2016095808A1 CN 2015097422 W CN2015097422 W CN 2015097422W WO 2016095808 A1 WO2016095808 A1 WO 2016095808A1
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WO
WIPO (PCT)
Prior art keywords
urea
injection system
pump
inlet
outlet
Prior art date
Application number
PCT/CN2015/097422
Other languages
English (en)
French (fr)
Inventor
杨振球
樊高峰
龚超
Original Assignee
天纳克（苏州）排放系统有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 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
Priority to US15/536,985 priority Critical patent/US10443466B2/en
Publication of WO2016095808A1 publication Critical patent/WO2016095808A1/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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • 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
    • F01N9/00—Electrical control of exhaust gas treating 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
    • F01N2610/02—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
    • F01N2610/08—Adding substances to exhaust gases with prior mixing of the substances with a gas, e.g. air
    • F01N2610/085—Controlling the air supply
    • 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
    • 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
    • F01N2610/1453—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
    • F01N2610/148—Arrangement of sensors
    • 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
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1808—Pressure
    • 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

Definitions

  • the invention relates to a urea injection system, belonging to the field of engine exhaust aftertreatment.
  • a urea injection system including a fluid delivery device for extracting a urea solution from a urea tank, a common rail connected to the fluid delivery device, and the a plurality of nozzles connected in common rail and a controller for controlling the urea injection system
  • the common rail comprising a housing, a pressure detecting device mounted on the housing, and a pressure regulating device, the housing comprising An inlet passage for the urea solution to enter, an outlet passage for the urea solution to flow out, a plurality of delivery ports connected to the inlet passage, and a plurality of return ports connected to the outlet passage, the pressure detecting device and the inlet passage Connected, the pressure regulating device is connected between the inlet passage and the outlet passage, the pressure regulating device can connect or cut off the inlet passage and the outlet passage;
  • the urea injection system is simultaneously applicable to Processing exhaust of a plurality of engines, the plurality of nozzles including for injecting urine into
  • the first exhaust pipe and the second exhaust pipe are independent of each other.
  • the urea injection system includes a first inlet pipe connected to the first nozzle and a first return pipe, wherein the first inlet pipe is connected to a corresponding delivery port, the first a return pipe is connected to the corresponding return port; the urea injection system further includes a second inlet pipe connected to the second nozzle and a second return pipe, wherein the second inlet pipe is connected to the corresponding delivery port, The second return conduit is coupled to a corresponding return port; the urea injection system further includes a return conduit connecting the outlet passage to the urea tank.
  • the housing is substantially a rectangular parallelepiped, and includes a first end surface and a second end. a third end surface and a fourth end surface, wherein the first end surface is opposite to the second end surface, the third end surface is opposite to the fourth end surface; and the inlet passage and the outlet passage are penetrated The first end surface and/or the second end surface, the delivery port penetrates the third end surface, and the return port penetrates the fourth end surface.
  • the common rail is provided with a conveying joint connected to each conveying port and a reflow joint connected to each of the return ports, the number of the reflow joints being the same as the number of the conveying joints,
  • the inlet passage and the outlet passage are parallel to each other, the delivery joint is perpendicular to the inlet passage, and the return joint is perpendicular to the outlet passage.
  • the fluid delivery device includes an integrated cabinet, a pump installed in the integrated cabinet, an inlet line connecting the pump, and an outlet line connecting the pump, the pump including a motor at the bottom, a pump head at the top, and a magnetic coupling portion between the motor and the pump head, the pump head, the magnetic coupling portion, and the motor being arranged from top to bottom, the pump A U-shaped flow path is provided in the head and a gear mechanism at the bottom of the flow path.
  • the inlet pipe and the outlet pipe are respectively connected to two ends of the flow channel, and the inlet pipe, the outlet pipe and the pump head are connected to each other. Form an inverted U shape.
  • the integrated cabinet is provided with a bottom wall
  • the inlet pipeline is provided with a pump front monitoring module adjacent to the bottom wall, and an inlet tube connected to the pump front monitoring module and vertically extending
  • an inlet connection pipe connecting the inlet pipe and the pump head
  • the outlet pipe is provided with a post-pump monitoring module adjacent to the bottom wall, an outlet pipe connecting the post-pump detection module and vertically extending, and a connection
  • the outlet pipe is connected to the outlet of the pump head.
  • a negative pressure sensor and a urea temperature sensor are mounted on the pre-pump monitoring module, and a pressure sensor is installed on the post-pump monitoring module, and the pre-pump monitoring module and the pump are monitored.
  • the module passes through the bottom wall, and a urea suction interface is opened on the pump front monitoring module, and a urea output interface is opened on the post-pump monitoring module, and the urea suction interface and the urea output interface are both located a bottom portion of the integrated cabinet;
  • the magnetic coupling portion includes an active magnetic drive and a driven magnetic drive, the driven magnetic drive is provided with a pump head input shaft, and the pump head input shaft is coupled to the gear mechanism,
  • the controller is located within the integrated cabinet.
  • a urea injection system including a fluid delivery device for extracting a urea solution from the urea tank, a plurality of nozzles for injecting a urea solution into the exhaust pipe, and connecting at the same a plurality of urea solution distribution joints between the fluid delivery device and the plurality of nozzles and a controller for controlling the urea injection system, the urea injection system being simultaneously adapted to treat exhaust gases of a plurality of engines, the plurality of nozzles comprising a first nozzle for injecting a urea solution into a first exhaust pipe connected to the first engine; and a second nozzle for injecting a urea solution into a second exhaust pipe connected to the second engine; the urea injection
  • the system includes a first inlet pipe connected to the first nozzle and a first return pipe, and a second inlet pipe connected to the second nozzle and a second return pipe; the plurality of urea solution distribution joints including the first one in series a three-
  • the present invention uses only one set of urine by providing a plurality of nozzles respectively corresponding to a plurality of engines.
  • the exhaust of multiple engines can be processed simultaneously.
  • Figure 1 is a schematic diagram of a urea injection system for use in multiple engine exhaust gas treatments of the present invention.
  • Figure 2 is a perspective view of the fluid delivery device of Figure 1.
  • Fig. 3 is a front view of Fig. 2;
  • Figure 4 is a perspective view of the fluid delivery device of Figure 2 with the front wall removed.
  • Figure 5 is a cross-sectional view of the motor in the fluid delivery device of Figure 4.
  • Figure 6 is a perspective view of the common rail of Figure 1.
  • Figure 7 is a perspective view of another angle of Figure 6.
  • Figure 8 is a front elevational view of the common rail.
  • Figure 9 is a schematic rear view of a common rail.
  • Figure 10 is a schematic cross-sectional view of a common rail.
  • Figure 11 is an exploded perspective view of the common rail after the mounting plate is removed.
  • Figure 12 is an exploded perspective view of another angle of Figure 11.
  • Figure 13 is a schematic diagram of another embodiment of a urea injection system for multiple engine exhaust gas treatments of the present invention.
  • the present invention discloses a urea injection system 100 that is simultaneously applicable to the treatment of exhaust gases from multiple engines.
  • the engine includes a first engine 21, a second engine 22, and a third engine 23.
  • the first engine 21 is connected to the first exhaust pipe 211, and a rear end of the first exhaust pipe 211 is mounted with a selective catalytic reduction device (SCR).
  • the second engine 22 is connected to the second exhaust pipe 221, and the rear end of the second exhaust pipe 221 is also mounted with a selective catalytic reduction device (SCR).
  • the third engine 23 is connected to the third exhaust pipe 231, and the rear end of the third exhaust pipe 231 is also mounted with a selective catalytic reduction device (SCR).
  • the power of the first, second, and third engines 21, 22, 23 may be the same or different.
  • the first exhaust pipe 211 , the second exhaust pipe 221 , and the third exhaust pipe 231 are independent of each other.
  • the first exhaust pipe 211, the second exhaust pipe 221, and the third exhaust pipe 231 may also be merged together, and then the exhaust gas is passed through a selective catalytic reduction (SCR).
  • SCR selective catalytic reduction
  • the urea injection system 100 includes a urea tank 1, a filter 3, a fluid delivery device 4 for extracting the urea solution in the urea tank 1 outward, a common rail 5 connected to the fluid delivery device 4, and A plurality of nozzles connected to the common rail 5 and a controller 7 for controlling the urea injection system 100.
  • the fluid delivery device 4 includes an integrated cabinet 41, a pump 42 installed in the integrated cabinet 41, an inlet line 43 on one side of the pump 42, and a pump. 42 the outlet line 44 on the other side.
  • the controller 7 is mounted to the integrated cabinet 41.
  • the integrated cabinet 41 is substantially rectangular parallelepiped and includes a front wall 411, a rear wall 412, a top wall 413, a bottom wall 414, a first side wall 415, and a second side wall 416.
  • the front wall 411 is a main operation interface
  • the front wall 411 is provided with a human-machine interaction interface 4111, an emergency stop switch 4112, a main power switch 4113, a monitoring indicator 4114, and a door lock. 4115.
  • the human-machine interaction interface 4111, the emergency stop switch 4112, and the main power switch 4113 are disposed in the middle of the front wall 411, and are arranged in order from top to bottom in the vertical direction.
  • the human-computer interaction interface 4111, the emergency stop switch 4112 and the main power switch 4113 are both centered on the front wall 411, and the upper and lower positions follow ergonomic principles to ensure excellent operational line of sight comfort.
  • the emergency stop switch 4112 quickly interrupts the system power source when an unexpected situation occurs in the system, and follows the maximum principle to ensure the safety of the system.
  • the monitoring indicator 4114 can monitor and display the working state of the system in real time and online. In the illustrated embodiment of the invention, the monitoring indicator 4114 is a three color light (eg, red, yellow, green).
  • the three-color lamp is a lamp, and in different working states, the monitoring indicator 4114 performs light display of different colors and frequencies. Through the display of the light, the working state of the system can be known at a glance. Compared with the prior art, three lamps are used to display different colors, and the three-color lamp of the invention can save cost and layout.
  • the door lock 4115 is a yin-yang triangular opening and closing structure in the illustrated embodiment of the present invention, which imparts excellent physical safety characteristics to the system.
  • a plurality of wire harness joints 4151 are mounted on the first side wall 415, and the wire harness joints 4151 are respectively connected inwardly with the controller 7, the pump 42, and various sensors, etc., respectively, outwardly and externally with signals of the system and Power supply and other connections.
  • the harness connector 4151 is both near the bottom of the integrated cabinet 41, reducing the vibration intensity of the harness connector 4151.
  • the controller 7 is located inside the first side wall 415.
  • the pump 42 is a gear pump.
  • the pump 42 includes a motor 421 at the bottom, a pump head 422 at the top, and a magnetic coupling portion 423 between the motor 421 and the pump head 422.
  • the motor 421 includes a motor output shaft 4211.
  • a U-shaped urea flow path 4221 and a gear mechanism 4222 located at the bottom of the urea flow path 4221 are disposed in the pump head 422.
  • the magnetic coupling portion 423 includes an active magnetic disk drive 4231 and a driven magnetic disk drive 4232.
  • the motor shaft 4211 is connected and fixed to the active magnetic disk 4231.
  • the driven magnetic drive 4232 is provided with a pump head input shaft 4233, and the pump head input shaft 4233 is connected and fixed to the gear mechanism 4222.
  • the motor 421 is powered on, the motor output shaft 4211 drives the active magnetic disk drive 4231 to rotate, and then the active magnetic disk drive 4231 drives the pump head input shaft 4233 to rotate, and the pump head input shaft 4233 further drives the gear.
  • the mechanism 4222 rotates to cause the urea solution to flow in the direction of the arrow and increase the outlet pressure of the urea solution.
  • the gear mechanism 4222 since the gear mechanism 4222 is located at the bottom of the urea flow path 4221, it is possible to prevent air bubbles in the urea solution from accumulating inside the pump head 422, thereby ensuring the working efficiency of pumping liquid and Deliver the accuracy of metering control.
  • the inlet line 43 includes a pump front monitoring module 431 at the bottom end, an inlet tube 432 connecting the pump front monitoring module 431, and an inlet connection tube 433 connecting the inlet tube 432 to the pump head 422.
  • the inlet line 43 connected by a plurality of components can provide convenient maintenance.
  • the pre-pump monitoring module 431 has a hexagonal structure and is characterized by high reliability, compactness, and light weight. Installed on the pre-pump monitoring module 431 There are a negative pressure sensor 4311 and a urea temperature sensor, wherein it is possible to judge whether the filter 3 needs to be replaced by monitoring the negative pressure sensor 4311.
  • the outlet line 44 includes a post-pump monitoring module 441 at the bottom end, an outlet tube 442 that connects the post-pump monitoring module 441, and an outlet connection tube 443 that connects the outlet tube 442 to the pump head 422. .
  • the outlet line 44 connected by a plurality of components can provide convenient maintenance.
  • the post-pump monitoring module 441 has a hexagonal structure and is characterized by high reliability, compactness, and weight reduction.
  • a pressure sensor 4411 is mounted on the post-pump monitoring module 441 to detect the pressure of the high pressure section.
  • the pre-pump monitoring module 431 and the post-pump monitoring module 441 are both perforated, that is, the pre-pump monitoring module 431 and the post-pump monitoring module 441 are both traversed.
  • the bottom wall 414 of the integrated cabinet 41 is described.
  • the pre-pump monitoring module 431 is provided with a urea suction interface 4310.
  • the post-pump monitoring module 441 is provided with a urea output interface 4410.
  • the urea suction interface 4310 and the urea output interface 4410 are both located in the integrated cabinet 41.
  • the external urea pipeline is arranged to be fully protected, avoiding mechanical collisions, other liquids and dust pollution.
  • the pre-pump monitoring module 431 and the post-pump monitoring module 441 both adopt parallel urea piping design to minimize pressure loss.
  • the pump 42 is arranged in a vertical direction, the pump head 422 is vertically upward, and on the one hand, the active magnetic drive 4231 and the driven magnetic field can be ensured based on the magnetic drive mechanism.
  • the alignment performance of the drive 4232 improves the transmission efficiency of the magnetic driving force in the pump assembly; on the other hand, it can eliminate the air bubbles accumulated in the urea solution in the pump body, ensure the working efficiency of the pump 42 pumping liquid, and deliver the metering The precision of the control.
  • the integrated cabinet 41 is further provided with a pump driving module 4131 installed inside the top wall 413.
  • This design enables the pump drive module 4131 to be in a higher position to avoid short circuits due to overflow of the urea solution.
  • the pump driving module 4131 is in close contact with the top wall 413. In this way, the heat generated by the operation of the pump driving module 4131 can be dissipated in time to ensure the normal operating temperature of the pump driving module 4131.
  • the pump drive module 4131 is adjacent to the pump head 422, the urea solution within the pump head 422 also carries away some of the thermal energy radiated by the pump drive module 4131.
  • the common rail 5 is used to regulate the pressure in the urea injection system 100.
  • the common rail 5 includes a housing 50, a pressure detecting device 51 mounted on the housing 50, and a pressure regulating device 52, an inlet joint 53 connected to the fluid transporting device 4 through a high pressure conduit, and a return flow.
  • the housing 50 is substantially rectangular parallelepiped and includes a first end surface 501, a second end surface 502, a third end surface 503, a fourth end surface 504, a front surface 505, and a back surface 506 opposite the front surface.
  • the first end surface 501 is opposite to the second end surface 502; the third end surface 503 is opposite to the fourth end surface 504; the front surface 505 and the first end surface 501, the second end surface 502, and the The three end faces 503 and the fourth end faces 504 are all perpendicular.
  • the inlet joint 53 and the outlet joint 54 are mounted on the first end surface 501 and/or the second end surface 502.
  • the inlet fitting 53 and the outlet fitting 54 are mounted on the first end face 501 on.
  • the second end surface 502 is provided with a threaded hole 5021.
  • the pressure detecting device 51 is a pressure sensor mounted on the second end surface 502 and connected to the inlet passage. 531 connected.
  • the pressure regulating device 52 is a pressure control valve that is mounted within the mounting slot 5061 and between the mounting plates 5062. As such, the mounting plate 5062 can provide protection to the pressure control valve.
  • the pressure control valve is coupled between the inlet passage 531 and the outlet passage 541, and the pressure control valve can communicate or interrupt the inlet passage 531 with the outlet passage 541. For example, when the pressure sensor detects that the pressure in the inlet passage 531 is greater than a set value, the controller 7 opens the pressure control valve to achieve a pressure relief function.
  • the common rail 5 of the present invention is very different from the common rail of the existing fuel injection.
  • the common rail 5 used in the urea injection system of the present invention needs to withstand much less pressure than the common rail of the fuel injection.
  • the rectangular casing 50 disclosed in the present invention has good workability. More importantly, this provides a possibility for integrating the exit passage 541 into the common rail 5.
  • the diameter of the inlet passage 531 is greater than the diameter of the outlet passage 541. The reason for this design is that, by scientific analysis, it is found that the pressure required to be received by the inlet passage 531 and the outlet passage 541 is also different.
  • the common rail 5 further includes a fixing piece 58 that is fastened outside the pressure sensor 51.
  • the fixing piece 58 is locked with the screw hole 5021 by a bolt 581 to press the pressure.
  • a sensor 52 is secured to the housing 50.
  • the pressure control valve mounted on the common rail 5 has three functions: first, assisting in establishing pressure in the urea line; second, voltage regulation after pressure establishment; third, stopping in the urea injection system 100 Previously, the air in the urea tank 1 was drawn into the line of the urea injection system by means of the reverse rotation of the pump 42 to evacuate the urea solution in the line.
  • the pressure control valve designed by the present invention skillfully solves such problems.
  • the controller 7 controls to open the pressure control valve (for example, to cause the pressure control valve to be at a certain fixed opening or varying opening degree) when the system first begins to build pressure, and to connect the inlet passage 531 to the
  • the outlet passage 541 communicates to provide a passage for releasing air in the pipeline to facilitate rapid pressure build-up of the pipeline.
  • the controller 7 will quickly adjust the opening of the pressure control valve to control the urea.
  • the return flow of the solution is used to achieve the purpose of regulating the pressure.
  • the controller 7 opens the pressure control valve, and the pump 42 rotates in the reverse direction to draw the air in the urea tank 1 into the pipeline of the urea injection system.
  • the controller 7 has received a signal that the system is about to stop, at which time the nozzle has stopped spraying, but the pump 42 is still rotating (for example, turn).
  • the urea solution in the pipeline is evacuated for the purpose of preventing damage to the system due to freezing and expansion of the urea solution.
  • the housing 50 further includes the inlet passage 531 connected to the inlet joint 53, the outlet passage 541 connected to the outlet joint 54, and at least one delivery port connected to the inlet passage 531. 55. At least one return port 56 connected to the outlet passage 541.
  • the inlet passage 531 and the outlet passage 541 penetrate the first end surface 501 and/or the second end surface 502. In the illustrated embodiment of the present invention, the inlet passage 531 and the outlet passage 541 both penetrate the first end surface 501.
  • the inlet passage 531 and the outlet passage 541 are parallel to each other for easy processing. In the illustrated embodiment of the present invention, the number of the delivery ports 55 is several.
  • the third end surface 503 is provided with three delivery ports 55 and three delivery joints 551 connected to the delivery ports 55.
  • Each delivery joint 551 is perpendicular to the inlet passage 531.
  • the three conveying joints 551 are spaced apart between the first end surface 501 and the second end surface 502.
  • a urea mass sensor 57 is mounted on the delivery joint 551 adjacent the third end surface 503.
  • the urea mass sensor 57 may also be mounted on any one of the delivery joints 551; or all of the three delivery joints 551 may be mounted with a urea mass sensor 57.
  • the number of the return ports 56 is also three, and three return ports 56 and three return joints 561 connected to the return port 56 are disposed on the fourth end face 504.
  • Each of the return connections 561 is perpendicular to the outlet passage 541.
  • the three reflow joints 561 are also spaced apart between the first end surface 501 and the second end surface 502.
  • the delivery port 55 extends through the third end surface 503
  • the return port 56 extends through the fourth end surface 504 .
  • the number of the reflow joints 561 is the same as the number of the delivery joints 551, but the installation direction is reversed.
  • Each of the delivery ports 55 is aligned with a corresponding return port 56.
  • the nozzle includes a first nozzle 61 for injecting a urea solution into the first exhaust pipe 211 of the first engine 21 for A second nozzle 62 that injects a urea solution in the second exhaust pipe 221 of the engine 22, and a third nozzle 63 that injects a urea solution into the third exhaust pipe 231 of the third engine 23 are disposed.
  • the urea injection system 100 includes a first inlet pipe 611 connected to the first nozzle 61 and a first return pipe 612, a second inlet pipe 621 and a second return pipe 622 connected to the second nozzle 62, and A third inlet pipe 631 and a third return pipe 632 are connected to the three nozzles 63.
  • the first, second, and third intake tubes 611, 621, and 631 are connected to the corresponding delivery ports 55, and the first, second, and third return tubes 612, 622, and 632 and the corresponding return ports are connected. 56 connected.
  • the first, second, and third nozzles 61, 62, 63 can inject a urea solution into the first, second, and third exhaust pipes 211, 221, 231 for chemical reaction.
  • the refluxed urea solution is first collected into the common rail 5 through the first, second, and third return lines 612, 622, 632, and then uniformly returned to the urea tank 1 through the return line 300.
  • a scheme of directly introducing the return line into the urea tank 1 is generally employed, which requires a separate return line for each nozzle, which is costly.
  • the length of the line between the urea tank 1 and the nozzle tends to be large, and the existing reflow design cannot meet the requirements.
  • the common rail 5 in the present invention can realize centralized control management of the spray solution under the control of the controller 7, and can achieve the effect of stabilizing the pressure of the urea solution.
  • the inlet pipe and the return pipe are different depending on the number and power of the engine The number will vary.
  • the controller 7 determines the real-time operating conditions of the respective engines based on the intake pressure, intake air temperature, intake air humidity, and engine speed of each engine. According to the different working conditions of each engine, it is decided to inject the amount of urea solution into each exhaust pipe to achieve control and coordination between multiple engines.
  • a plurality of urea solution distribution joints may be used instead of the common rail 5 , and the plurality of urea solution distribution joints are connected to the fluid delivery device. Between the pump nozzle 4 and the pump nozzle, the urea solution pumped from the fluid delivery device 4 is dispensed into a corresponding nozzle.
  • the urea solution distribution joint includes a first three-way joint 81 and a second three-way joint 82, wherein the inlet 811 of the first three-way joint 81 and the fluid
  • the urea output port 4410 of the delivery device 4 is connected, one of the outlets 812 of the first three-way joint 81 is connected to the first inlet tube 611, and the other outlet 813 is connected to the inlet 821 of the second three-way joint 82.
  • one of the outlets 822 of the second three-way joint 82 is connected to the second inlet pipe 621, and the other outlet 823 is connected to the third inlet pipe 631.
  • the urea injection system 100 further includes a third three-way joint 83 and a fourth three-way joint 84 for collecting reflux urea, wherein the third three-way joint
  • the two inlets 831, 832 of the joint 83 are connected to the second and third return pipes 622, 632, respectively, and the outlet 833 is connected to one of the inlets 841 of the fourth three-way joint 84.
  • the other inlet 842 of the fourth three-way joint 84 is connected to the first return pipe 612, and the outlet 843 of the fourth three-way joint 84 is connected to the return pipe 300 to unify the reflux-cooled urea. Said in the urea tank 1.
  • the urea injection system 100 of the present invention is capable of meeting engine exhaust aftertreatment requirements where the total power is not greater than a certain threshold (e.g., 12,000 kW), regardless of the model and power of each engine. In the event that the total power does not exceed the threshold, the number of engines will not affect the operation of the system.
  • a certain threshold e.g. 12,000 kW

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Abstract

一种尿素喷射系统（100），其包括用以从尿素罐（1）中向外抽取尿素溶液的流体输送装置（4）、间接与流体输送装置（4）相连的若干喷嘴以及用以控制尿素喷射系统（100）的控制器（7），该尿素喷射系统（100）同时适用于处理多台发动机的尾气，若干喷嘴包括用以向第一发动机（21）的第一排气管（211）中喷射尿素溶液的第一喷嘴（61）以及用以向第二发动机（22）的第二排气管（221）中喷射尿素溶液的第二喷嘴（62）。本尿素喷射系统（100）通过设置分别对应于多个发动机的多个喷嘴，在仅使用一套尿素喷射系统的情况下就能够同时处理多台发动机的尾气。

Description

尿素喷射系统
本申请要求了申请日为2014年12月16日，申请号为201420794022.5，发明名称为“尿素喷射系统”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
本发明涉及一种尿素喷射系统，属于发动机尾气后处理领域。
背景技术
共轨系统在发动机的燃油喷射系统中的应用由来已久。这种燃油喷射的共轨因为需要承受非常高的压力，其结构是非常受限制的。由于圆筒结构相较于其他结构能够承受较高的压力，因此现有燃油喷射的共轨几乎均采用圆筒结构。
随着各国尾气排放标准的越趋严格，对作为尾气处理的尿素喷射系统提出更高的要求。如何控制尿素喷射系统中的压力成为业界普遍存在的技术问题。
另外，现有技术中通常针对一台发动机配置一套尿素喷射系统，这种配置方式的安装以及控制均比较复杂。
发明内容
本发明的目的在于提供一种能够同时适用于处理多台发动机尾气的尿素喷射系统。
为实现上述目的，本发明采用如下技术方案：一种尿素喷射系统，其包括用以从尿素罐中向外抽取尿素溶液的流体输送装置、与所述流体输送装置相连的共轨、与所述共轨相连的若干喷嘴以及用以控制所述尿素喷射系统的控制器，所述共轨包括壳体、安装在所述壳体上的压力检测装置以及压力调节装置，所述壳体包括用以供尿素溶液进入的进口通道、用以供尿素溶液流出的出口通道、与所述进口通道相连的若干输送口以及与所述出口通道相连的若干回流口，所述压力检测装置与所述进口通道相连，所述压力调节装置被连接在所述进口通道与所述出口通道之间，所述压力调节装置能够将所述进口通道与所述出口通道连通或者截断；所述尿素喷射系统同时适用于处理多台发动机的尾气，所述若干喷嘴包括用以向与第一发动机相连的第一排气管中喷射尿素溶液的第一喷嘴以及用以向与第二发动机相连的第二排气管中喷射尿素溶液的第二喷嘴。
作为本发明进一步改进的技术方案，所述第一排气管与所述第二排气管相互独立。
作为本发明进一步改进的技术方案，所述尿素喷射系统包括与第一喷嘴相连的第一进流管以及第一回流管，其中所述第一进流管与对应的输送口相连，所述第一回流管与对应的回流口相连；所述尿素喷射系统还包括与第二喷嘴相连的第二进流管以及第二回流管，其中所述第二进流管与对应的输送口相连，所述第二回流管与对应的回流口相连；所述尿素喷射系统还包括将所述出口通道与所述尿素罐连接的回流管道。
作为本发明进一步改进的技术方案，所述壳体大致呈长方体，其包括第一端面、第二端 面、第三端面以及第四端面，其中所述第一端面与所述第二端面相对设置，所述第三端面与所述第四端面相对设置；所述进口通道与所述出口通道贯穿所述第一端面及/或第二端面，所述输送口贯穿所述第三端面，所述回流口贯穿所述第四端面。
作为本发明进一步改进的技术方案，所述共轨设有与每一个输送口相连的输送接头以及与每一个回流口相连的回流接头，所述回流接头的数量与所述输送接头的数量相同，所述进口通道与所述出口通道相互平行，所述输送接头垂直于所述进口通道，所述回流接头垂直于所述出口通道。
作为本发明进一步改进的技术方案，所述流体输送装置包括集成柜、安装于所述集成柜内的泵、连接所述泵的进口管路以及连接所述泵的出口管路，所述泵包括位于底部的电机、位于顶部的泵头以及位于所述电机与所述泵头之间的磁性耦合部，所述泵头、所述磁性耦合部以及所述电机自上而下布置，所述泵头内设有U形的流道以及位于所述流道最底部的齿轮机构。
作为本发明进一步改进的技术方案，所述进口管路与所述出口管路分别连接于所述流道的两端，并且所述进口管路、所述出口管路与所述泵头相互连接形成倒U形。
作为本发明进一步改进的技术方案，所述集成柜设有底壁，所述进口管路设有靠近所述底壁的泵前监测模块、连接所述泵前监测模块且竖向延伸的入口管以及连接所述入口管与所述泵头的入口连接管；所述出口管路设有靠近所述底壁的泵后监测模块、连接所述泵后检测模块且竖向延伸的出口管以及连接所述出口管与所述泵头的出口连接管。
作为本发明进一步改进的技术方案，所述泵前监测模块上安装有负压传感器以及尿素温度传感器，所述泵后监测模块上安装有压力传感器，所述泵前监测模块与所述泵后监测模块均穿过所述底壁，所述泵前监测模块上开设有尿素吸取接口，所述泵后监测模块上开设有尿素输出接口，所述尿素吸取接口与所述尿素输出接口均位于所述集成柜的底部；所述磁性耦合部包括主动磁驱及从动磁驱，所述从动磁驱上设有泵头输入轴，所述泵头输入轴与所述齿轮机构相连接，所述控制器位于所述集成柜内。
本发明还可以采用如下技术方案：一种尿素喷射系统，其包括用以从尿素罐中向外抽取尿素溶液的流体输送装置、用以向排气管中喷射尿素溶液的若干喷嘴、连接在所述流体输送装置与所述若干喷嘴之间的若干尿素溶液分配接头以及用以控制所述尿素喷射系统的控制器，所述尿素喷射系统同时适用于处理多台发动机的尾气，所述若干喷嘴包括用以向与第一发动机相连的第一排气管中喷射尿素溶液的第一喷嘴以及用以向与第二发动机相连的第二排气管中喷射尿素溶液的第二喷嘴；所述尿素喷射系统包括与第一喷嘴相连的第一进流管以及第一回流管，以及与第二喷嘴相连的第二进流管以及第二回流管；所述若干尿素溶液分配接头包括相互串联的第一三通接头以及第二三通接头，其中所述第一三通接头设有与所述第一进流管连接的出口，所述第二三通接头设有与所述第二进流管连接的出口。
相较于现有技术，本发明通过设置分别对应于多个发动机的多个喷嘴，在仅使用一套尿 素喷射系统的情况下就能够同时处理多台发动机的尾气。
附图说明
图1是本发明用于多台发动机尾气处理的尿素喷射系统的原理图。
图2是图1中流体输送装置的立体图。
图3是图2的主视图。
图4是图2中的流体输送装置拆除前壁后的立体示意图。
图5是图4中流体输送装置内的电机的剖面图。
图6是图1中共轨的立体示意图。
图7是图6另一角度的立体示意图。
图8是共轨的正面示意图。
图9是共轨的背面示意图。
图10是共轨的剖面示意图。
图11是共轨在拆除安装板后的立体分解图。
图12为图11另一角度的立体分解图。
图13是本发明用于多台发动机尾气处理的尿素喷射系统在另一实施方式中的原理图。
具体实施方式
为了使本发明的目的、技术方案和优点更加清楚，下面结合附图和具体实施例对本发明进行详细描述。
请参图1所示，本发明揭示了一种尿素喷射系统100，其能够同时适用于处理多台发动机的尾气。在本发明图示的实施方式中，所述发动机包括第一发动机21、第二发动机22以及第三发动机23。所述第一发动机21与第一排气管211相连，所述第一排气管211的后端安装有选择性催化还原器(SCR)。所述第二发动机22与第二排气管221相连，所述第二排气管221的后端也安装有选择性催化还原器(SCR)。所述第三发动机23与第三排气管231相连，所述第三排气管231的后端也安装有选择性催化还原器(SCR)。所述第一、第二、第三发动机21、22、23的功率可以相同或者不同。请参图1所示，在本发明图示的实施方式中，所述第一排气管211、第二排气管221以及第三排气管231相互独立。当然，在其他实施方式中，所述第一排气管211、第二排气管221以及第三排气管231也可以汇合到一起，然后再使尾气经过选择性催化还原器(SCR)。
所述尿素喷射系统100包括尿素罐1、过滤器3、用以将所述尿素罐1内的尿素溶液向外抽出的流体输送装置4、与所述流体输送装置4相连的共轨5、与所述共轨5相连的若干喷嘴以及用以控制所述尿素喷射系统100的控制器7。
请参图2至图5所示，所述流体输送装置4包括集成柜41、安装于所述集成柜41内的泵42、位于所述泵42一侧的进口管路43以及位于所述泵42另一侧的出口管路44。请参图4所示，在本发明图示的实施方式中，所述控制器7安装于所述集成柜41。
所述集成柜41大致呈长方体，其包括前壁411、后壁412、顶壁413、底壁414、第一侧壁415以及第二侧壁416。在本发明图示的实施方式中，所述前壁411为主操作界面，所述前壁411上设有人机交互界面4111、急停开关4112、主电源开关4113、监测指示器4114以及门锁4115。所述人机交互界面4111、所述急停开关4112及所述主电源开关4113三者布置在所述前壁411的中部，且沿竖直方向从上到下依次排列。如此设置，所述主操作界面整体满足简洁、对称美学设计。所述人机交互界面4111、所述急停开关4112及所述主电源开关4113在所述前壁411上均左右居中，上下位置遵循人机工程学原则，保证优良的操作视线舒适度。所述急停开关4112在系统发生意外情况时，快速中断系统动力源，遵循最大原则，保证系统的安全。所述监测指示器4114能够实时、在线监控、显示系统的工作状态。在本发明图示的实施方式中，所述监测指示器4114为三色灯(例如红、黄、绿)。所述三色灯是一个灯，其在不同的工作状态，该监测指示器4114进行不同颜色及频率的灯光显示。通过所述灯光显示就能够一目了然的知晓所述系统的工作状态。相较于现有技术中采用三个灯分别显示不同的颜色，本发明的三色灯能够节省成本且布局方便。所述门锁4115在本发明图示的实施方式中为阴阳三角启闭结构，其赋予系统优异的物理安全特性。
所述第一侧壁415上安装有若干线束接头4151，所述线束接头4151向内分别与所述控制器7、所述泵42以及各种传感器等连接，向外分别与系统外部的信号以及电源等连接。在本发明图示的实施方式中，所述线束接头4151均靠近所述集成柜41的底部，降低了所述线束接头4151的振动烈度。所述控制器7位于所述第一侧壁415的内侧。
请参图4所示，在本发明图示的实施方式中，所述泵42为齿轮泵。所述泵42包括位于底部的电机421、位于顶部的泵头422以及位于所述电机421与所述泵头422之间的磁性耦合部423。请参图5所示，所述电机421包括一根电机输出轴4211。所述泵头422内设有一个U形的尿素流道4221以及位于所述尿素流道4221最底部的齿轮机构4222。所述磁性耦合部423包括主动磁驱4231以及从动磁驱4232。所述电机轴4211与所述主动磁驱4231相连接、固定。所述从动磁驱4232设有一根泵头输入轴4233，所述泵头输入轴4233与所述齿轮机构4222相连接、固定。
工作时，所述电机421上电，所述电机输出轴4211带动所述主动磁驱4231旋转，然后所述主动磁驱4231带动泵头输入轴4233旋转，所述泵头输入轴4233进一步带动齿轮机构4222旋转，从而使所述尿素溶液沿箭头的方向流动，且提高尿素溶液的出口压力。在本发明图示的实施方式中，由于所述齿轮机构4222位于所述尿素流道4221最底部，能够避免尿素溶液内的气泡在所述泵头422内部积聚，确保泵送液体的工作效率及投送计量控制的精度。
所述进口管路43包括位于底端的泵前监测模块431、连接所述泵前监测模块431的入口管432以及将所述入口管432连接于所述泵头422的入口连接管433。由多个部件连接的所述进口管路43能够起到便捷的维护性。在本发明图示的实施方式中，所述泵前监测模块431为六角面结构，具有高可靠性、紧凑化、轻量化的特点。所述泵前监测模块431上安装 有负压传感器4311以及尿素温度传感器，其中通过监测所述负压传感器4311能够判断所述过滤器3是否需要更换。
类似地，所述出口管路44包括位于底端的泵后监测模块441、连接所述泵后监测模块441的出口管442以及将所述出口管442连接于所述泵头422的出口连接管443。由多个部件连接的所述出口管路44能够起到便捷的维护性。在本发明图示的实施方式中，所述泵后监测模块441为六角面结构，具有高可靠性、紧凑化、轻量化的特点。所述泵后监测模块441上安装有压力传感器4411，以检测高压段的压力。
在本发明图示的实施方式中，所述泵前监测模块431与所述泵后监测模块441均为穿孔安装，即所述泵前监测模块431与所述泵后监测模块441均穿过所述集成柜41的底壁414。所述泵前监测模块431上开设有尿素吸取接口4310，所述泵后监测模块441上开设有尿素输出接口4410，所述尿素吸取接口4310与所述尿素输出接口4410均位于所述集成柜41的底部，保证外部尿素管道走向布置得到充分保护，避免了机械碰撞、其他液体、灰尘的污染。另外，所述泵前监测模块431与所述泵后监测模块441均采用平行尿素管道设计，以最大限度的降低压损。
在本发明图示的实施方式中，所述泵42沿竖直方向布置，所述泵头422竖直朝上，一方面，基于磁力驱动机构，能够保证所述主动磁驱4231与从动磁驱4232的对中性能，提升泵总成内磁性驱动力的传递效率；另一方面，能够消除积聚在泵体内尿素溶液中的气泡，确保所述泵42泵送液体的工作效率及投送计量控制的精度。
请参图4所示，所述集成柜41内还设有安装在所述顶壁413内侧的泵驱动模块4131。这种设计能够将所述泵驱动模块4131位于较高的位置，从而避免因尿素溶液的溢出而发生短路。所述泵驱动模块4131与所述顶壁413紧密贴合。如此设置，能够及时散热所述泵驱动模块4131工作产生的热量，保证该所述泵驱动模块4131正常的工作温度。另外，因为所述泵驱动模块4131靠近所述泵头422，所述泵头422内的尿素溶液也会带走所述泵驱动模块4131辐射的部分热能。
请参图6至图12所示，所述共轨5用以调节所述尿素喷射系统100中的压力。具体地，所述共轨5包括壳体50、安装在所述壳体50上的压力检测装置51以及压力调节装置52、通过高压管道与所述流体传输装置4连接的进口接头53以及通过回流管道300与所述尿素罐1连接的出口接头54。
请参图10所示，所述壳体50大致呈长方体，其包括第一端面501、第二端面502、第三端面503、第四端面504、正面505以及与所述正面相对的背面506。其中，所述第一端面501与所述第二端面502相对设置；所述第三端面503与第四端面504相对设置；所述正面505与所述第一端面501、第二端面502、第三端面503以及第四端面504均垂直。所述进口接头53与所述出口接头54安装于所述第一端面501及/或所述第二端面502上。在本发明图示的实施方式中，所述进口接头53与所述出口接头54被安装在所述第一端面501 上。所述第二端面502上设有螺纹孔5021，在本发明图示的实施方式中，所述压力检测装置51为压力传感器，其被安装在所述第二端面502上并与所述进口通道531连通。在本发明图示的实施方式中，所述压力调节装置52为压力控制阀，其被安装在所述安装槽5061内且位于安装板5062之间。如此设置，所述安装板5062对所述压力控制阀能够起到保护作用。从功能上讲，所述压力控制阀被连接在所述进口通道531与所述出口通道541之间，所述压力控制阀能够将所述进口通道531与所述出口通道541连通或者截断。例如，当所述压力传感器检测到所述进口通道531内的压力大于设定值时，所述控制器7将所述压力控制阀打开，从而实现泄压功能。
在本发明的共轨5与现有燃油喷射的共轨是非常不同的。首先，经过大量的数据分析，本发明应用在尿素喷射系统中的共轨5所需要承受的压力远小于燃油喷射的共轨。基于这种分析，本发明所揭示的长方形的壳体50具备较好的加工性。更为重要的是，这为将出口通道541集成在所述共轨5中的方案提供了可行性。当然，在本发明图示的实施方式中，所述进口通道531的直径要大于所述出口通道541的直径。这种设计的理由在于，通过科学分析，发现所述进口通道531与所述出口通道541需要承受的压力也是不同的。
请参图7所示，所述共轨5还包括扣持在所述压力传感器51外部的固定片58，所述固定片58通过螺栓581与所述螺纹孔5021锁扣，以将所述压力传感器52固定到所述壳体50上。
安装在所述共轨5上的压力控制阀有三个作用：第一、协助建立尿素管路中的压力；第二、压力建立后的稳压控制；第三、在所述尿素喷射系统100停止之前，借助所述泵42的反向转动，将所述尿素罐1中的空气抽入所述尿素喷射系统的管路中以排空所述管路中的尿素溶液。
具体地，当系统刚开始建立压力时，管路中可能存在大量的空气，而空气的可压缩性容易导致建压失败。本发明所设计的压力控制阀巧妙的解决了此类问题。在系统刚开始建压时，所述控制器7控制打开所述压力控制阀(例如使所述压力控制阀处于某一固定的开度或者变化的开度)，将所述进口通道531与所述出口通道541连通以提供一个通道来释放管路中的空气，便于管路的快速建压。
当系统建压完成后，为了保证所述共轨5中的尿素压力维持在设定的压力附近并基本恒定，所述控制器7会快速调节所述压力控制阀的开度，从而通过控制尿素溶液的回流量来达到调节压力的目的。
在所述尿素喷射系统100停止之前，所述控制器7将所述压力控制阀打开，所述泵42反向转动，将所述尿素罐1中的空气抽入所述尿素喷射系统的管路中以排空所述管路中的尿素溶液。需要说明的是：在所述尿素喷射系统100停止之前是指所述控制器7已经接到系统即将停机的信号，此时所述喷嘴已经停止喷射，但是所述泵42仍然在转动(例如反转)。排空所述管路中的尿素溶液，其目的在于防止因尿素溶液结冰、膨胀而损坏系统。
请参图10所示，所述壳体50还包括与进口接头53相连的所述进口通道531、与出口接头54相连的所述出口通道541、与所述进口通道531相连的至少一个输送口55、与所述出口通道541相连的至少一个回流口56。所述进口通道531与所述出口通道541贯穿所述第一端面501及/或第二端面502。在本发明图示的实施方式中，所述进口通道531与所述出口通道541均贯穿所述第一端面501。所述进口通道531与所述出口通道541相互平行，便于加工。在本发明图示的实施方式中，所述输送口55为若干个，具体地，所述第三端面503上设有三个输送口55及三个与所述输送口55相连的输送接头551。每个输送接头551均垂直于所述进口通道531。三个所述输送接头551间隔的分布在所述第一端面501与第二端面502之间。在本发明图示的实施方式中，靠近所述第三端面503那个输送接头551上安装有尿素质量传感器57。当然，在其他实施方式中，所述尿素质量传感器57也可以被安装于任何一个输送接头551上；或者也可将三个输送接头551上全部安装有尿素质量传感器57。在本发明图示的实施方式中，所述回流口56也为三个，在所述第四端面504上设置三个回流口56及三个与所述回流口56相连的回流接头561。每个回流接头561均垂直于所述出口通道541。三个所述回流接头561也间隔的分布在所述第一端面501与第二端面502之间。所述输送口55贯穿所述第三端面503，所述回流口56贯穿所述第四端面504。所述回流接头561的数量与所述输送接头551的数量相同，但安装方向相反。每一个输送口55与相应的回流口56对齐设置。
请参图1所示，在本发明图示的实施方式中，所述喷嘴包括用以向第一发动机21的第一排气管211中喷射尿素溶液的第一喷嘴61、用以向第二发动机22的第二排气管221中喷射尿素溶液的第二喷嘴62、以及用以向第三发动机23的第三排气管231中喷射尿素溶液的第三喷嘴63。所述尿素喷射系统100包括与第一喷嘴61相连的第一进流管611以及第一回流管612，与第二喷嘴62相连的第二进流管621以及第二回流管622，以及与第三喷嘴63相连的第三进流管631以及第三回流管632。其中，所述第一、第二、第三进流管611、621、631与对应的输送口55相连，所述第一、第二、第三回流管612、622、632与对应的回流口56相连。如此设置，一方面，所述第一、第二、第三喷嘴61、62、63能够将尿素溶液喷射至所述第一、第二、第三排气管211、221、231内进行化学反应；另一方面，又能够利用回流的尿素溶液对所述喷嘴进行冷却。回流的尿素溶液首先通过第一、第二、第三回流管路612、622、632全部汇集到所述共轨5中，然后再通过回流管道300统一回流到所述尿素罐1中。现有技术中，通常采用直接将所述回流管路引入到所述尿素罐1中的方案，这种方案会使每一个喷嘴都需要一根独立的回流管路，成本较高。另外，结合本发明的应用，特别是在大功率发动机的尾气处理系统中，所述尿素罐1与所述喷嘴之间的管路长度往往较大，现有的这种回流设计不能满足要求。
在本发明中的共轨5在所述控制器7的控制下，能够实现喷射溶液的集中控制管理，并且能够达到稳定尿素溶液压力的作用。根据发动机的数量及功率不同，所述进流管及回流管 的数量将伴随改变。另外，所述控制器7根据每台发动机的进气压力、进气温度、进气湿度及发动机转速等，判断各台发动机的实时工况。根据每台发动机的不同工况，决定向每根排气管内喷射尿素溶液量的多少，以实现多台发动机之间的控制及协调。
请参图13所示，在本发明的另一实施方式中，也可以不用共轨5，而用多个尿素溶液分配接头来代替，所述多个尿素溶液分配接头连接在所述流体输送装置4与所述泵嘴之间，以将自所述流体输送装置4泵出的尿素溶液分配到对应的喷嘴中。具体地，在本发明图示的实施方式中，所述尿素溶液分配接头包括第一三通接头81以及第二三通接头82，其中所述第一三通接头81的入口811与所述流体输送装置4的尿素输出接口4410相连，所述第一三通接头81的其中一个出口812与所述第一进流管611相连，另一个出口813与所述第二三通接头82的入口821相连。另外，所述第二三通接头82的其中一个出口822与所述第二进流管621相连，另一个出口823与所述第三进流管631相连。
另外，请参图13所示，在该实施方式中，所述尿素喷射系统100还包括用以收集回流尿素的第三三通接头83以及第四三通接头84，其中所述第三三通接头83的两个入口831、832分别与第二、第三回流管622、632相连，出口833与所述第四三通接头84的其中一个入口841相连。所述第四三通接头84的另外一个入口842与第一回流管612相连，所述第四三通接头84的出口843与所述回流管道300相连，以将回流冷却的尿素统一回到所述尿素罐1中。
本发明的尿素喷射系统100能够满足总功率不大于某个阈值(例如12000KW)的发动机组排放后处理需求，与每台发动机的型号及功率无关。在总功率不超过所述阈值的情况下，发动机数量的多少也不会影响该系统的运行。
另外，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，例如对“前”、“后”、“左”、“右”、“上”、“下”等方向性的描述，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 (10)

  1. 一种尿素喷射系统，其包括用以从尿素罐中向外抽取尿素溶液的流体输送装置、与所述流体输送装置相连的共轨、与所述共轨相连的若干喷嘴以及用以控制所述尿素喷射系统的控制器，其特征在于：所述共轨包括壳体、安装在所述壳体上的压力检测装置以及压力调节装置，所述壳体包括用以供尿素溶液进入的进口通道、用以供尿素溶液流出的出口通道、与所述进口通道相连的若干输送口以及与所述出口通道相连的若干回流口，所述压力检测装置与所述进口通道相连，所述压力调节装置被连接在所述进口通道与所述出口通道之间，所述压力调节装置能够将所述进口通道与所述出口通道连通或者截断；所述尿素喷射系统同时适用于处理多台发动机的尾气，所述若干喷嘴包括用以向与第一发动机相连的第一排气管中喷射尿素溶液的第一喷嘴以及用以向与第二发动机相连的第二排气管中喷射尿素溶液的第二喷嘴。
  2. 如权利要求1所述的尿素喷射系统，其特征在于：所述第一排气管与所述第二排气管相互独立。
  3. 如权利要求1所述的尿素喷射系统，其特征在于：所述尿素喷射系统包括与第一喷嘴相连的第一进流管以及第一回流管，其中所述第一进流管与对应的输送口相连，所述第一回流管与对应的回流口相连；所述尿素喷射系统还包括与第二喷嘴相连的第二进流管以及第二回流管，其中所述第二进流管与对应的输送口相连，所述第二回流管与对应的回流口相连；所述尿素喷射系统还包括将所述出口通道与所述尿素罐连接的回流管道。
  4. 如权利要求1所述的尿素喷射系统，其特征在于：所述壳体大致呈长方体，其包括第一端面、第二端面、第三端面以及第四端面，其中所述第一端面与所述第二端面相对设置，所述第三端面与所述第四端面相对设置；所述进口通道与所述出口通道贯穿所述第一端面及/或第二端面，所述输送口贯穿所述第三端面，所述回流口贯穿所述第四端面。
  5. 如权利要求4所述的尿素喷射系统，其特征在于：所述共轨设有与每一个输送口相连的输送接头以及与每一个回流口相连的回流接头，所述回流接头的数量与所述输送接头的数量相同，所述进口通道与所述出口通道相互平行，所述输送接头垂直于所述进口通道，所述回流接头垂直于所述出口通道。
  6. 如权利要求1所述的尿素喷射系统，其特征在于：所述流体输送装置包括集成柜、安装于所述集成柜内的泵、连接所述泵的进口管路以及连接所述泵的出口管路，所述泵包括位于底部的电机、位于顶部的泵头以及位于所述电机与所述泵头之间的磁性耦合部，所述泵头、所述磁性耦合部以及所述电机自上而下布置，所述泵头内设有U形的流道以及位于所述流道最底部的齿轮机构。
  7. 如权利要求6所述的尿素喷射系统，其特征在于：所述进口管路与所述出口管路分别连接于所述流道的两端，并且所述进口管路、所述出口管路与所述泵头相互连接形成倒U 形。
  8. 如权利要求7所述的尿素喷射系统，其特征在于：所述集成柜设有底壁，所述进口管路设有靠近所述底壁的泵前监测模块、连接所述泵前监测模块且竖向延伸的入口管以及连接所述入口管与所述泵头的入口连接管；所述出口管路设有靠近所述底壁的泵后监测模块、连接所述泵后检测模块且竖向延伸的出口管以及连接所述出口管与所述泵头的出口连接管。
  9. 如权利要求8所述的尿素喷射系统，其特征在于：所述泵前监测模块上安装有负压传感器以及尿素温度传感器，所述泵后监测模块上安装有压力传感器，所述泵前监测模块与所述泵后监测模块均穿过所述底壁，所述泵前监测模块上开设有尿素吸取接口，所述泵后监测模块上开设有尿素输出接口，所述尿素吸取接口与所述尿素输出接口均位于所述集成柜的底部；所述磁性耦合部包括主动磁驱及从动磁驱，所述从动磁驱上设有泵头输入轴，所述泵头输入轴与所述齿轮机构相连接，所述控制器位于所述集成柜内。
  10. 一种尿素喷射系统，其包括用以从尿素罐中向外抽取尿素溶液的流体输送装置、用以向排气管中喷射尿素溶液的若干喷嘴、连接在所述流体输送装置与所述若干喷嘴之间的若干尿素溶液分配接头以及用以控制所述尿素喷射系统的控制器，其特征在于：所述尿素喷射系统同时适用于处理多台发动机的尾气，所述若干喷嘴包括用以向与第一发动机相连的第一排气管中喷射尿素溶液的第一喷嘴以及用以向与第二发动机相连的第二排气管中喷射尿素溶液的第二喷嘴；所述尿素喷射系统包括与第一喷嘴相连的第一进流管以及第一回流管，以及与第二喷嘴相连的第二进流管以及第二回流管；所述若干尿素溶液分配接头包括相互串联的第一三通接头以及第二三通接头，其中所述第一三通接头设有与所述第一进流管连接的出口，所述第二三通接头设有与所述第二进流管连接的出口。
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