CN108625937A - exhaust gas aftertreatment system - Google Patents

Abstract

A kind of exhaust gas aftertreatment system comprising the spraying system of exhaust aftertreatment and the package system of exhaust aftertreatment.The spraying system includes a kind of integrating device of pump and nozzle comprising pump group part and nozzle assembly.The pump group part includes motor case assembly, magnetic force shade assembly and pump case assembly.The motor case assembly includes electro-magnetic shielding cover and electrical-coil.The motor case assembly is fixed together with the pump case assembly by way of rolling or welding.The pump case assembly includes being connected with the nozzle assembly with the access road and exit passageway for pumping and being connected to, the exit passageway.The pump case assembly further includes intermeshing first gear component and second gear component.The exhaust gas aftertreatment system of the present invention is compact, and control accuracy is higher.

Description

Exhaust gas aftertreatment system

Technical field

The present invention relates to a kind of exhaust gas aftertreatment systems, belong to diesel motor exhaust post-processing technology field.

Background technology

It is more and more tighter with the discharge standard of internal-combustion engines vehicle, in order to reduce the harmful substances such as oxynitrides in exhaust, The post-processing technology of industry generally use is selective catalytic reduction (SCR) at present, and installs in the upstream of SCR and sprayed into exhaust Penetrate urea liquid.Hydrolysis occurs for urea liquid, pyrolysis generates ammonia, and is chemically reacted with oxynitrides etc., and then drops The concentration of low harmful substance.

Urea injection system currently on the market generally includes air assist system and non-air auxiliary system.Certainly, nothing By which kind of system include urea box assembly, be connected with the urea box assembly by low pressure pipeline pump feed unit, pass through The nozzle module and controller that pressure piping is connected with pump feed unit.Pump feed unit includes that urea pump and pressure pass Sensor etc., nozzle module include urea nozzle etc..Urea pump and urea nozzle interval larger distance, and pass through urea tube phase Even.In addition, existing urea injection system includes more parts, installation is complicated, and cost is higher.

Invention content

The purpose of the present invention is to provide a kind of exhaust gas aftertreatment systems compact-sized, control is more accurate.

To achieve the above object, the present invention adopts the following technical scheme that：

A kind of exhaust gas aftertreatment system comprising the spraying system of exhaust aftertreatment and the encapsulation system of exhaust aftertreatment System, wherein the package system includes carrier, the spraying system includes the urea injection system positioned at the upstream of the carrier And the fuel nozzle positioned at the upstream of the urea injection system, wherein the urea injection system include a kind of urea pump with The integrating device of urea nozzle, wherein the urea pump to the urea nozzle pump urea liquid, the urea nozzle To spray urea in the exhaust to engine, the integrating device includes shell, is at least partly installed in the shell Pump group part and with the matched nozzle assembly of the pump group part, wherein the shell include positioned at the pump group part upstream and The access road that is connected to the pump group part and positioned at the downstream of the pump group part and the outlet that is connected to the pump group part it is logical Road, the exit passageway are connected to the nozzle assembly；The pump group part include the electrical-coil for driving the urea pump, With the magnetic substance of electrical-coil interaction and intermeshing first gear component and second gear component, wherein institute It includes first gear to state first gear component, and the second gear component includes second gear, the first gear and described the Two gears are intermeshed, and the shell is equipped with the gear grooved for accommodating the first gear and the second gear, the gear grooved Side be equipped with admission chamber with the inlet passage, the other side of the gear grooved is equipped with to be connected to the exit passageway Go out sap cavity；The nozzle assembly includes the nozzle coil for driving the nozzle.

As further improved technical scheme of the present invention, the carrier includes the diesel oil oxidation catalysis being connected to exhaust pipe Agent, positioned at the diesel particulate filter in the diesel oxidation catalyst downstream and positioned at the diesel particulate filter downstream Selective catalytic reducing agent, wherein the fuel nozzle be located at the diesel oxidation catalyst and the diesel particulate filter it Between, the integrating device is between the diesel particulate filter and the selective catalytic reducing agent.

As further improved technical scheme of the present invention, the exhaust gas aftertreatment system further includes being located at the integrated dress The mixer of the upstream in the downstream, the selective catalytic reducing agent set.

As further improved technical scheme of the present invention, the integrating device is additionally provided with to the urea pump and described The controller that urea nozzle is independently controlled respectively, the controller include circuit board, the electrical-coil and the nozzle Coil is all connected on the circuit board.

As further improved technical scheme of the present invention, the integrating device includes being connected to the exit passageway and institute State the overflow element between access road.

The invention further relates to a kind of exhaust gas aftertreatment systems comprising after the spraying system and tail gas of exhaust aftertreatment The package system of reason, wherein the package system includes carrier, the spraying system includes the urine positioned at the upstream of the carrier Plain spraying system and fuel nozzle positioned at the upstream of the urea injection system, wherein the urea injection system includes one The integrating device of kind of urea pump and urea nozzle, wherein the urea pump to the urea nozzle pumping urea liquid, institute Urea nozzle is stated to spray urea in the exhaust to engine, the integrating device includes pump group part and nozzle assembly；Institute State pump group part include motor case assembly, the magnetic force shade assembly that is at least partially disposed in the motor case assembly and with it is described The matched pump case assembly of motor case assembly；The motor case assembly includes electro-magnetic shielding cover and is at least partially disposed at Electrical-coil in the electro-magnetic shielding cover；The magnetic force shade assembly includes the metal being at least partially inserted into the electrical-coil The rotor for covering and being contained in the metal cap；The pump case assembly include positioned at the urea pump upstream and with it is described The access road of urea pump connection and positioned at the downstream of the urea pump and the exit passageway that is connected to the urea pump, it is described Exit passageway is connected with the nozzle assembly；The pump case assembly further includes intermeshing first gear component and second Gear assembly, wherein the first gear component includes first gear axis and first gear, the second gear component includes Second gear axis and second gear, the first gear are intermeshed with the second gear, and the rotor is fixed on described On first gear axis；The pump case assembly is equipped with the gear grooved for accommodating the first gear and the second gear, the tooth The side of race is equipped with the admission chamber with the inlet passage, and the other side of the gear grooved is equipped with and the exit passageway Connection goes out sap cavity；The nozzle assembly includes the nozzle coil for driving the nozzle.

As further improved technical scheme of the present invention, as six further improved technical solution of technical solution, institute It includes the controller being independently controlled respectively to the urea pump and the urea nozzle, the control to state motor case assembly Device processed includes circuit board, and the electrical-coil is all connected to the nozzle coil on the circuit board.

As further improved technical scheme of the present invention, it is additionally provided in the metal cap positioned at the top of the rotor Freeze proof body, the freeze proof body can be compressed to absorb because of swelling volume caused by urea icing.

As further improved technical scheme of the present invention, the pump group part further includes being housed in the metal cap and position Elastomer below the rotor, the elastomer can be compressed to absorb because of swelling volume caused by urea icing.

As further improved technical scheme of the present invention, the pump case assembly is additionally provided in the admission chamber First freeze proof stick and positioned at it is described go out sap cavity in the second freeze proof stick, the first freeze proof stick and the described second freeze proof equal energy of stick It is enough to be compressed when urea freezes.

As further improved technical scheme of the present invention, the injector assembly includes interacting with the nozzle coil Magnetic portion, at least partly accommodate the magnetic portion the first sleeve, the needle portion below the magnetic portion, at least partly It accommodates the second sleeve in the needle portion, act on spring and the needle portion between the magnetic portion and the needle portion The valve seat of cooperation and the spinning disk on the valve seat is fabricated separately and sticked on the valve seat, the spinning disk is equipped with several Eddy flow slot.

As further improved technical scheme of the present invention, the nozzle coil is located at the periphery of the magnetic portion, described Needle portion is equipped with needle, and first sleeve and the second sleeve are mutually fixed is centered around the peripheral of the needle portion to be formed Space, the needle are equipped with the through-hole being connected with the space, and the second sleeve, which is equipped with, is connected to the space and the rotation The connectivity slot of chute, the valve seat are equipped with and the matched spray-hole of the needle.

As further improved technical scheme of the present invention, the motor case assembly is equipped with the connector of injection molding, The connector is electrically connected with the circuit board, and the circuit board is equipped with several electronic components, and the motor case is total At further including the cooling pad for being covered in the electronic component surface.

As further improved technical scheme of the present invention, the magnetic force shade assembly includes being located at below the metal cap Plate portion, the plate portion are fixed on by several screws on the pump case assembly.

As further improved technical scheme of the present invention, the pump case assembly includes first shell, the first shell Body includes the first upper surface, the first lower surface and first side, wherein first upper surface is equipped with first annular slot, by institute State the first island portion that first annular slot surrounds and the first sealing ring being housed in the first annular slot, the plate portion to Under compress first sealing ring；First island portion is equipped with through the first positioning hole of first lower surface and through institute The second location hole of the first lower surface is stated, the urea pump includes the first axle sleeve being housed in the first positioning hole and receipts Hold the second axle sleeve in the second location hole, wherein the first gear axis is inserted into first axle sleeve, described second Gear shaft is inserted into second axle sleeve.

As further improved technical scheme of the present invention, first island portion further include through first upper surface and The first diversion trench for being connected to the second location hole and first go out through first upper surface and with go out that sap cavity is connected to Oral pore；First upper surface is additionally provided with the side positioned at first island portion and to accommodate the sensor receiving of sensor Hole, the integrating device include sensor to detect temperature and pressure；The first shell is additionally provided with to be received with the sensor Hold the second outlet hole that hole is connected.

As further improved technical scheme of the present invention, the first shell is equipped with overflow element container, the collection The overflow element being installed in the overflow element container is equipped at device；When the pressure of the exit passageway is higher than setting value When, the overflow element is opened to return to part urea liquid in the access road.

As further improved technical scheme of the present invention, the pump case assembly includes being located under the first shell Side and the second shell being connect with the first shell, the second shell include the second upper surface and the second lower surface, institute Gear grooved is stated through second upper surface and the second lower surface.

As further improved technical scheme of the present invention, the pump case assembly includes being located under the second shell Side and the third shell that is connect with the second shell, the third shell include body part and from the body part to downward The lug boss stretched, wherein the body part is equipped with third upper surface, the third upper surface is equipped with third annular groove and by institute State the third island portion of third annular groove encirclement.

As further improved technical scheme of the present invention, the nozzle assembly includes injector assembly and is socketed in described The water-cooling subbase of the outside of injector assembly, the water-cooling subbase are equipped with mounting groove, the first cooling duct, lead to first cooling Spaced second cooling duct in road and the peripheral end cap for being sealed in the mounting groove, the injector assembly is at the end It covers and forms the annular cooling bath for being connected to first cooling duct and second cooling duct between the second sleeve, First cooling duct is connect with inlet attack with so that engine coolant injects, and second cooling duct connects with outlet Head connection is flowed out with for engine coolant.

Compared to the prior art, present invention pump and the integrating device of nozzle well integrate pump with nozzle, tie Structure is simple, compact, greatly facilitates the installation of client.In addition, by controlling electrical-coil and nozzle coil, from And interfering with each other between pump and nozzle is avoided, improve the accuracy of control.It is integrated with urea pump and urine in integrating device On the basis of plain nozzle, due to the raising of control accuracy, the amount for the urea that can be sparged into exhaust reaches with oxynitrides Suitable ratio reduces the crystallization risk generated because excessively spraying urea.

Description of the drawings

Fig. 1 is that the integrating device of the present invention applies schematic diagram when handling motor exhaust.

Fig. 2 is the schematic diagram of integrating device in Fig. 1.

Fig. 3 is the stereoscopic schematic diagram of the integrating device of the present invention in one embodiment.

Fig. 4 is the vertical view of Fig. 3.

Fig. 5 is the part isometric exploded view of integrating device of the present invention, and wherein pump group part is separated with nozzle assembly.

Fig. 6 is the part isometric exploded view of integrating device of the present invention, and wherein motor case assembly is separated.

Fig. 7 is the stereoscopic schematic diagram of motor case assembly in Fig. 6.

Fig. 8 is the part isometric exploded view of motor case assembly in Fig. 6.

Fig. 9 is the further stereogram exploded views of Fig. 8, and wherein electrical-coil is separated.

Figure 10 is further stereogram exploded view after motor case assembly in removal Fig. 6.

Figure 11 is the further stereogram exploded views of Figure 10.

Figure 12 is the further stereogram exploded views of Figure 11.

Figure 13 is the further stereogram exploded views of Figure 12, and wherein pump case assembly, injector assembly, end cap etc. is separated Come.

Figure 14 is the part isometric exploded view of pump case assembly in Figure 13.

Figure 15 is first shell and the stereogram exploded view of element thereon in Figure 14.

Figure 16 is Figure 15 in the stereogram exploded view of another angle.

Figure 17 is the stereogram of first shell in Figure 15.

Figure 18 is Figure 17 in the stereogram of another angle.

Figure 19 is the vertical view of Figure 18.

Figure 20 is the vertical view of Figure 17.

Figure 21 is the diagrammatic cross-section of the line C-C along Figure 20.

Figure 22 is the diagrammatic cross-section of the line D-D along Figure 20.

Figure 23 is the diagrammatic cross-section of the E-E lines along Figure 20.

Figure 24 is the diagrammatic cross-section of the F-F lines along Figure 20.

Figure 25 is the stereoscopic schematic diagram removed in Figure 14 after first shell.

Figure 26 is the part isometric exploded view of Figure 25.

Figure 27 is the vertical view of Figure 25.

Figure 28 is the further stereogram exploded views of Figure 25.

Figure 29 is the stereogram of injector assembly in Figure 13.

Figure 30 is the diagrammatic cross-section of the G-G lines along Figure 29.

Figure 31 is the stereogram exploded view of Figure 29.

Figure 32 is the further stereogram exploded views of Figure 31.

Figure 33 is the diagrammatic cross-section of the line A-A along Fig. 4.

Figure 34 is the diagrammatic cross-section of the line B-B along Fig. 4.

Figure 35 is the diagrammatic cross-section of the H-H lines along Figure 33.

Figure 36 is the stereogram exploded view of integrating device of the present invention.

Figure 37 is the schematic diagram of the exhaust gas aftertreatment system of the present invention.

Specific implementation mode

It please join shown in Fig. 1 and Figure 37, present invention is disclosed a kind of exhaust gas aftertreatment systems 100, can be applied to processing hair The tail gas of motivation 10 reduces the discharge of harmful substance to meet the requirement of emission regulation.The exhaust gas aftertreatment system 100 includes The spraying system of exhaust aftertreatment and the package system 300 of exhaust aftertreatment, wherein the spraying system includes urea injection System 200 and fuel nozzle 400 positioned at the upstream of the urea injection system 200.In illustrative embodiments of the present invention In, the fuel nozzle 400 is hydrocarbon nozzle (HCI).The urea injection system 200 is urinated to be pumped from urea box 201 Plain solution (shown in ginseng arrow X) and to the engine 10 air inlet either exhaust (such as to exhaust pipe 106 or encapsulation system System 300 in) in injection urea liquid integrating device 1；The package system 300 includes being located at 1 downstream of the integrating device Mixer 301 and carrier.Certainly, mixer can not also be set in some embodiments, be either arranged two or two A above mixer.The carrier includes the diesel oil being connected to the exhaust pipe 106 in illustrative embodiments of the present invention Oxidation catalyst (DOC) 303, positioned at 303 downstream of the diesel oxidation catalyst diesel particulate filter (DPF) 304 and Selective catalytic reducing agent (SCR) 302 positioned at 304 downstream of the diesel particulate filter, wherein the fuel nozzle 400 Between the diesel oxidation catalyst 303 and the diesel particulate filter 304, the integrating device 1 is located at the diesel oil Between particulate filter 304 and the selective catalytic reducing agent 302.

The engine 10 has engine coolant circulation loop.It please join shown in Fig. 1, in the embodiment party that the present invention illustrates In formula, the engine coolant circulation loop includes that first circulation circuit 101 (shown in ginseng block arrow Y) and second circulation are returned Road 102 (is joined shown in thin arrow Z), wherein the first circulation circuit 101 is to the cooling integrating device 1, to reduce its quilt The risk that the engine exhaust of high temperature is burnt out；The second circulation circuit 102 is added to heat the urea box 201 with realizing Hot defrosting function.It is understood that in first circulation circuit 101, the integrating device 1 is equipped with for engine cool liquid stream The inlet attack 103 entered and the outlet connection 104 flowed out for engine coolant；In second circulation circuit 102, it is equipped with Control valve 105 realizes the control to second circulation circuit 102 to open or close the control valve 105 under appropriate conditions System.The heating rod 202 being connected in the second circulation circuit 102 is equipped in the urea box 201, to utilize engine cool The temperature of liquid carries out heating defrosting to urea liquid.

Just the integrating device 1 of the present invention is described in detail below.

It please join shown in Fig. 2, from principle, integrating device 1 of the invention is integrated with urea pump 11 and urea nozzle 12 Function.The urea pump 11 includes but not limited to gear pump, diaphragm pump, plunger pump or vane pump etc..It should be understood that This term used " integrated " refer to urea pump 11 and urea nozzle 12 can be installed in as single device air inlet pipe or On person's exhaust pipe；Or urea pump 11 is close to each other with urea nozzle 12 and is attached by shorter connecting pipe, whole It can be considered as a device on body.

In addition, the exhaust gas aftertreatment system 100 of the present invention is additionally provided with controller 13.The controller 13 can be to urea pump 11 and urea nozzle 12 be independently controlled.It please join shown in Figure 37, in illustrative embodiments of the present invention, the controller 13 and fuel nozzle 400 communicated by CAN bus and control unit of engine (ECU) 500.It is appreciated that the control Device 13 processed can be integrated with the integrating device 1 or is provided separately with the integrating device 1.It please join shown in Fig. 2, In illustrative embodiments of the present invention, the controller 13 is integrated in the integrating device 1, to realize the highly integrated of part Change, improves the installation convenience of client.

The integrating device 1 is equipped with to accommodate the shell 14 of the urea pump 11 and the urea nozzle 12.Shown in Fig. 2 Embodiment be only rough display to shell 14.For example, in one embodiment, the shell 14 by urea pump 11 with And urea nozzle 12 is shared；In another embodiment, the shell 14 is divided into and urea pump 11 matched first Shell and with 12 matched second shell of urea nozzle, first shell is assembled together with second shell, to form one It is whole.Certainly, in other implementations, the shell 14 can also be divided into several with urea pump 11 and/or urine Plain nozzle 12 matches.The shell 14 is equipped with the access road being connected between the urea box 201 and the urea pump 11 15 and the exit passageway 16 that is connected between the urea pump 11 and the urea nozzle 12.It should be noted that making here Using urea pump 11 as reference, i.e., " outlet " in " entrance " and " exit passageway 16 " in the term " access road 15 " used is The upstream of urea pump 11 is entrance, and the downstream of urea pump 11 is outlet.The exit passageway 16 is connected to the urea nozzle 12, To pump urea liquid to the urea nozzle 12.It is understood that the access road 15 is located at the upstream of urea pump 11, For low-pressure channel；The exit passageway 16 is located at the downstream of urea pump 11, is high-pressure channel.

In addition, the integrating device 1 is equipped with to detect the temperature sensor of temperature.The temperature sensor can be set It is set to and is connected to the access road 15 and/or the exit passageway 16；Or the temperature sensor can be set to pacify Mounted in any position of the integrating device 1.The signal that the temperature sensor detects passes to controller 13, controller 13 The accuracy of spray of urea nozzle 12 can be improved based on the control algolithm designed by the input signal and other signals.The collection It is additionally provided with to detect the pressure sensor of pressure at device 1, the pressure sensor is connected to the exit passageway 16, with inspection Survey the pressure in the high-pressure channel that urea pump 11 exports.Due to the Integrated design of the present invention, the distance of inner passage is shorter, because What this can consider the pressure sensor is located closer to the urea nozzle 12.The advantages of this design, is that pressure passes Pressure measured by the sensor relatively pressure in urea nozzle 12, improves the accuracy of data, and then improve urea The accuracy of spray of nozzle 12.In one embodiment of the invention, the temperature sensor and the pressure sensor are two A element；In another embodiment of the invention, the temperature sensor is an element with the pressure sensor (i.e. sensor 174, be detailed later), but have the function of detecting temperature and pressure simultaneously.

Please join shown in Fig. 2, the integrating device 1 be additionally provided be connected to the exit passageway 16 and the access road 15 it Between overflow element 173.The overflow element 173 includes but not limited to overflow valve, safety valve or electrically-controlled valve etc..The overflow The function of element 173 is to open the overflow element 173 when the pressure in high-pressure channel is higher than setting value, will be located at height Urea liquid in pressure passageway is discharged into low-pressure channel or is returned directly in the urea box 201, to realize pressure tune Section.

In order to drive urea pump 11, the urea pump 11 to be equipped with the electrical-coil 111 communicated with the controller 13. In order to drive urea nozzle 12, the urea nozzle 12 to be equipped with the nozzle coil 121 communicated with the controller 13.

The controller 13 is communicated with the temperature sensor and the pressure sensor, by temperature signal with And pressure signal sends the controller 13 to.Certainly, it is accurately controlled in order to realize, the controller 13 can also receive Other signals, such as from CAN bus, related with engine operating parameter signal.In addition, the controller 13 can be with Obtain the rotating speed of the urea pump 11, certainly, the acquisition of tach signal can by corresponding speed probe 175 (hardware) or Person is realized by control algolithm (software).The controller 13 respectively to the urea pump 11 and the urea nozzle 12 into Row independent control.The advantages of this control, is that influence of the action of urea pump 11 to urea nozzle 12 can be reduced, to realize Relatively high control accuracy.

In addition, under certain operating modes, since the exhaust of engine has a higher temperature, and 12 ordinary circumstance of urea nozzle It is lower to be mounted on exhaust pipe again, it is therefore desirable to the urea nozzle 12 to be carried out cooling and/or heat-insulated.The integrating device 1 is additionally provided with cooling component thus, and the cooling component cools down the urea nozzle 12 by cooling medium.The cooling Medium includes but not limited to air and/or engine coolant and/or lubricating oil and/or urea etc..It please join shown in Fig. 2, this Invention embodiment illustrated uses water cooling, i.e., is cooled down to urea nozzle 12 using engine coolant.It is set in shell 14 The useful cooling duct 141 circulated for engine coolant.It please join shown in Fig. 1, in illustrative embodiments of the present invention, institute State the mounting base 107 and be fixed on one with the mounting base 107 that integrating device 1 is additionally provided on the exhaust pipe 106 The heat shield 109 risen.

It please join shown in Fig. 2, the main operational principle of the integrating device 1 is as follows：

Controller 13 drives urea pump 11 to operate, and urea liquid is inhaled by access road 15 in urea box 201 Urea pump 11, through being overpressurized and then being delivered to urea nozzle 12 by exit passageway 16.Wherein, controller 13 acquisition and/or Calculate the signal, such as temperature, pressure, revolution speed etc. needed.When reaching injection conditions, controller 13 send out control signal to Urea nozzle 12, such as be powered to nozzle coil 121, realize that urea sprays by controlling the movement of needle.Controller 13 is sent out Go out to control signal to urea pump 11 to control its rotating speed, to the pressure of systems stabilisation.In illustrative embodiments of the present invention, The controller 13 is respectively independently controlled the urea pump 11 and the urea nozzle 12.

It please join shown in Fig. 3 to Figure 36, structurally, in illustrative embodiments of the present invention, the integrating device 1 includes Pump group part 18 and nozzle assembly 19.It please join shown in Fig. 5, the nozzle assembly 19 is at least partially inserted into the pump group part 18 In, and be welded and fixed together.

It please join shown in Fig. 3 to Fig. 5, in illustrative embodiments of the present invention, the pump group part 18 includes that motor case is total At 181, the magnetic force shade assembly 6 that is at least partially disposed in the motor case assembly 181 and with the motor case assembly 181 Matched pump case assembly 182.

It please join shown in Fig. 7 to Figure 10, the motor case assembly 181 includes electro-magnetic shielding cover 183, is at least partially disposed at institute State the electrical-coil 111 and controller 13 in electro-magnetic shielding cover 183.In illustrative embodiments of the present invention, the electromagnetism Shielding case 183 is to be made of metal material to reduce interference of the extraneous factor to internal electronic component etc., while can also reduce Influence of the internal electronic component to other external electronic equipments.The motor case assembly 181 further include injection molding outside The case 2 enclosed.The case 2 include cover the controller 13 and at least partly the case cavity 21 of pump group part 18, The through-hole 22 being connected to the case cavity 21 and the waterproof and breathable lid 24 being fixed in the through-hole 22.The electrical-coil 111 are electrically connected with controller 13.In illustrative embodiments of the present invention, the controller 13 is several including being disposed with thereon The circuit board 131 of electronic component.Electronic component can generate heat at work, and surrounding air is caused to expand, and the present invention is logical Cross setting waterproof and breathable lid 24 well solved because air expands damage chip and/or electronic component by pressure the problem of, simultaneously Also the effect of waterproof can be played.In addition, the waterproof and breathable lid 24 can improve the environment residing for controller 13, can expire Sufficient operating condition.

In illustrative embodiments of the present invention, the circuit board 131 is annular in shape, is equipped with the centre bore positioned at middle part 135.The connector 132 being connect with the circuit board 131 is injection molded on the case 2.In addition, the motor case assembly 181 further include the cooling pad 130 for being covered in the electronic component surface.So set, can be electronics by cooling pad 130 The equalizing temperature of component, to avoid burning out electronic component because of hot-spot.

The magnetic force shade assembly 6 includes the metal cap 62 being at least partially inserted into the electrical-coil 111, is located at the gold The rotor 72 etc. for belonging to the plate portion 61 of 62 lower section of cover and being contained in the metal cap 62.The wherein described metal cap 62 is prominent upwards For the plate portion 61.The metal cap 62 is upward through the centre bore 135 of the circuit board 131, and is at least partially inserted into In electrical-coil 111.It please join shown in Figure 10, the plate portion 61 is tightened in by several screws 133 on pump case assembly 182, The magnetic force shade assembly 6 to be fixed.In addition, being additionally provided in the metal cap 62 positioned at the anti-of the top of the rotor 72 Freeze body 70, the freeze proof body 70 can be compressed when urea freezes, and swelling volume be absorbed, to avoid being damaged by frost.In this hair In bright embodiment illustrated, the freeze proof body 70 is installed in a sleeve, and sleeve is carried out with the top of metal cap 62 again Rolling, to be fixed.The pump group part 18 further includes being housed in the metal cap 62 and positioned at 72 lower section of the rotor Elastomer 71, the elastomer 71 can also be compressed with absorb because urea freeze caused by swelling volume.It please join Figure 34 Shown, the electrical-coil 111 is socketed in the periphery of the metal cap 62.

The pump case assembly 182 includes first shell 3, second shell 4 and the third stacked gradually up and down together Shell 5.In illustrative embodiments of the present invention, the first shell 3, second shell 4 and third shell 5 are by metal material Material is made.The shell 14 includes the first shell 3, second shell 4 and third shell 5.

In illustrative embodiments of the present invention, the urea pump 11 is gear pump comprising the electrical-coil 111, The metal cap 62, the elastomer 71 in the metal cap 62 and rotor 72, first positioned at 62 lower section of the metal cap Sealing ring 73 and intermeshing first gear component 74 and second gear component 75 etc..Since gear pump can establish ratio Larger operating pressure, therefore be conducive to improve the flow of urea nozzle 12.In addition, gear pump can also invert, it is conducive to evacuate Remaining urea liquid reduces the risk of urea crystals.

Please join shown in Figure 14 to Figure 28, in illustrative embodiments of the present invention, the first shell 3, second shell 4 with And third shell 5 is machined piece, and be fixed together by bolt 66.The first shell 3 is equipped with the card slot positioned at side 34 and the O-ring seals 35 that are held in the card slot 34.In illustrative embodiments of the present invention, the first shell 3 It is fixed together by way of rolling or welding with motor case assembly 181, and close by the progress piston of O-ring seals 35 Envelope.

The first shell 3 includes the first upper surface 31, the first lower surface 32 and first side 33, wherein described first The first island portion 312 that upper surface 31 is equipped with first annular slot 311 and is surrounded by the first annular slot 311.First ring Shape slot 311 is accommodating first sealing ring 73.The plate portion 61 is close to realize downwardly against first sealing ring 73 Envelope.The second island portion 326 that first lower surface 32 is equipped with the second annular groove 325 and is surrounded by second annular groove 325. Second annular groove 325 is accommodating the second sealing ring 731 (as shown in figure 16).

First island portion 312 is equipped with the first positioning hole 3121 through first lower surface 32, runs through described first The second location hole 3122 of lower surface 32, through first upper surface 31 and the first outlet that is connected to the exit passageway 16 Hole 3123 and the first diversion trench 3124 being connected to through first upper surface 31 and with the second location hole 3122.Institute Urea pump 11 is stated to be equipped with the first axle sleeve 76 being housed in the first positioning hole 3121 and be housed in the second location hole The second axle sleeve 77 in 3122.The first shell 3 further includes several first assembly holes 318 passed through for bolt 66, and described One assembly hole 318 is through first upper surface 31 and first lower surface 32.First upper surface 31, which is additionally provided with, to be located at First island portion, 312 side and to accommodate the sensor accepting hole 313 of sensor 174, the sensor 174 has simultaneously Detect the function of temperature and pressure.The first shell 3 is additionally provided with the connection exit passageway 16 and the sensor accepting hole 313 second outlet hole 3125.

In addition, please join shown in Figure 24, the first shell 3 be equipped with through the first side 33 with urea connector 331 The feed pathway 332 of connection.It please join shown in Figure 15, Figure 16 and Figure 34, the urea connector 331 includes the filter screen close to outside 3311 and close to inside freeze proof element 3312, wherein the filter screen 3311 can carry out the impurity in urea liquid Filter, the freeze proof element 3312 can absorb swelling volume when urea freezes, to reduce the risk being damaged by frost.Described first Shell 3 is equipped with the connecting hole 3127 for running through first lower surface 32 and being connected to the feed pathway 332.First outlet hole 3123 are each perpendicular to feed pathway 332 with connecting hole 3127.The first positioning hole 3121, second location hole 3122, connecting hole 3127 downward through the second island portion 326.First lower surface 32, which is equipped with, is connected to the first positioning hole 3121 and described the First drain charge slot 321 of two location holes 3122, to ensure pressure balance.The first drain charge slot 321 is located at the second island portion 326 On.In addition, the first shell 3 is additionally provided with the host cavity 322 downward through first lower surface 32, to accommodate at least portion The nozzle assembly 19 divided.It please join shown in Figure 21 and Figure 22, the host cavity 322 is connected to the sensor accepting hole 313. Meanwhile the host cavity 322 is also connected to second outlet hole 3125.In illustrative embodiments of the present invention, second outlet hole 3125 in the inside of the first shell 3 be inclined.

In addition, please join shown in Figure 14 to Figure 16, Figure 22 and Figure 24, the first shell 3 is additionally provided with and feed pathway 332 And the overflow element container 319 that host cavity 322 is connected to.The overflow element container 319 runs through first side 33 outward, To accommodate the overflow element 173.The overflow element 173 is safety valve, purpose in illustrative embodiments of the present invention It is by way of pressure release to ensure that the pressure in 1 mesohigh channel of the integrating device is within the scope of safety value.In order to solid The fixed overflow element 173, the first shell 3 are equipped with the plug 5122 of the fixed overflow element 173.

It please join shown in Fig. 1, the urea connector 331 is connected to by urea connecting tube 333 with the urea box 201.In order to Preferably realize heating defrosting function, the exhaust gas aftertreatment system 100, which is also provided with, carries out the urea connecting tube 333 The heating device 334 of heating.It please join shown in Figure 24, in illustrative embodiments of the present invention, 332 level of the feed pathway is prolonged Stretch into the inside of the first shell 3.Certainly, in other embodiments, the feed pathway 332 can also be in certain angle Degree.

It please join shown in Figure 25 to Figure 27, the first gear component 74 includes first gear axis 741 and is fixed on first First gear 742 on gear shaft 741；The second gear component 75 is including second gear axis 751 and is fixed on the second tooth Second gear 752 on wheel shaft 751, the first gear 742 are intermeshed with the second gear 752.It please join Figure 25 to figure Shown in 27, in illustrative embodiments of the present invention, the first gear 742 and 752 external toothing of the second gear.In addition, The first gear axis 741 is driving shaft, and the second gear axis 751 is driven shaft, and the first gear axis 741 is higher than described Second gear axis 751.The upper end of the first gear axis 741 passes through first axle sleeve 76 and is fixed with rotor 72.Institute The upper end for stating second gear axis 751 is located in second axle sleeve 77.When being powered to electrical-coil 111, with magnetic substance 72 generate interaction, and electromagnetic force can drive first gear axis 741 to rotate, and thus drive first gear 742 and the second tooth 752 rotation of wheel.

Please join shown in Figure 25 to Figure 28, the second shell 4 be located at the lower section of the first shell 3 and with first shell 3 It is connected.In addition, in order to preferably position, several positioning pins are additionally provided between the first shell 3 and the second shell 4 328.The second shell 4 is including the second upper surface 41, the second lower surface 42 and runs through second upper surface 41 and second Lower surface 42 and to accommodate the gear grooved 43 of the first gear 742 and second gear 752.The side of the gear grooved 43 Equipped with the admission chamber 431 being connected to access road 15, the other side of the gear grooved 43 is equipped with to be connected to the exit passageway 16 Go out sap cavity 432.Specifically, admission chamber 431 is connected to connecting hole 3127, goes out upper end and the first outlet hole 3123 of sap cavity 432 Connection.In addition, in order to improve the anti-freezing property of product, the second shell 4 is additionally provided with first in the admission chamber 431 Freeze proof stick 441 and positioned at it is described go out sap cavity 432 in the second freeze proof stick 442, the first freeze proof stick 441 and described second anti- Freezing stick 442 can be compressed when urea freezes.

In addition, second shell 4 is additionally provided with for receiving hole 411 that at least partly nozzle assembly 19 passes through.The nozzle Component 19 partly protrudes second upper surface 41 and is housed in the host cavity 322 upwards.So set, the urea of high pressure Solution can be transported to urea nozzle 12.The second shell 4 further includes several be aligned with first assembly hole 318 Two assembly holes 418.

It please join shown in Figure 28, the third shell 5 is located at the lower section of the second shell 4 and is connected with second shell 4. The third shell 5 is outside including body part 51, the lug boss 52 extended downwardly from body part 51 and from the body part 51 The flange 53 of extension is used wherein the flange 53 is equipped with several third assembly holes 531 being aligned with second assembly hole 418 So that bolt 66 passes through.The body part 51 is equipped with third upper surface 511, and the third upper surface 511 is equipped with third annular groove 512 and the third island portion 513 surrounded by the third annular groove 512.The third annular groove 512 seals to accommodate third Enclose 732 (as shown in figure 33).Third island portion 513 is equipped with through the third location hole 5111 of third upper surface 511 and through the 4th location hole 5112 of three upper surfaces 511.The third shell 5 is equipped with the third being contained in the third location hole 5111 Axle sleeve 78 and the 4th axle sleeve 79 being contained in the 4th location hole 5112.The lower end of the first gear axis 741 positions In third axle sleeve 78, the lower end of the second gear axis 751 is located in the 4th axle sleeve 79.

In addition, the third island portion 513 is additionally provided with the second diversion trench 5114 and positioned at the third upper surface 511 Three diversion trenches 5115, wherein second diversion trench 5114 is connected to third location hole 5111, third diversion trench 5115 and the 4th Location hole 5112 is connected to.Second diversion trench 5114 is to be obliquely installed in the inside of third shell 5 with third diversion trench 5115 's.In the vertical direction, second diversion trench 5114 and the third diversion trench 5115 with it is described go out sap cavity 432 be connected It is logical, so set, to ensure that urea liquid can enter in third location hole 5111 and the 4th location hole 5112 with to third Axle sleeve 78 and the 4th axle sleeve 79 are lubricated.

When work, urea liquid from the urea connecting tube 333 enter feed pathway 332, and by connecting hole 3127 into Enter in admission chamber 431；After the pressurization of gear pump, the urea liquid of a part of high pressure is upward through first outlet hole 3123 And enter in metal cap 62, the urea liquid of another part high pressure is downwardly into the second diversion trench 5114 and third diversion trench In 5115；A part for urea liquid in metal cap 62 enters from the first diversion trench 3124 in the second axle sleeve 77, then leads to It crosses the first drain charge slot 321 to enter in the first axle sleeve 76, to improve the stationarity of gear pump rotation, reduces abrasion；Positioned at metal cap Another part urea liquid in 62 is entered to flow to nozzle assembly 19 in host cavity 322, simultaneously from second outlet hole 3125 A part of urea liquid flows to overflow element 173.When pressure is less than the setting value of overflow element 173, overflow element 173 closes It closes；And when pressure is more than the setting value of overflow element 173, overflow element 173 is opened, and part urea liquid enters feed pathway In 332, to realize pressure release.

It is appreciated that in illustrative embodiments of the present invention, access road 15 includes feed pathway 332, connecting hole 3127 and admission chamber 431.Because the access road 15 is located at the upstream of urea pump 11, it is referred to as low-pressure channel. The exit passageway 16 includes sap cavity 432, first outlet hole 3123, second outlet hole 3125, host cavity 322 etc..Because institute The downstream that exit passageway 16 is located at urea pump 11 is stated, so being referred to as high-pressure channel.

It please join shown in Figure 29 to Figure 36, the nozzle assembly 19 includes injector assembly 120 and to be socketed in the nozzle total At the water-cooling subbase 190 of 120 outside.In illustrative embodiments of the present invention, the injector assembly 120 and water-cooling subbase 190 together constitute urea nozzle 12.

It please join shown in Figure 29 to Figure 32, in illustrative embodiments of the present invention, the injector assembly 120 includes nozzle line Circle 121, the magnetic portion 81 to interact with the nozzle coil 121, the needle portion 82 positioned at 81 lower section of the magnetic portion, effect Spring 83 between the magnetic portion 81 and the needle portion 82 and (ginseng Figure 30 of valve seat 84 with the needle portion 82 cooperation It is shown) etc..Wherein, the nozzle coil 121 is located at the periphery of the magnetic portion 81, and the injector assembly 120 further includes at least First sleeve 811 of magnetic portion 81 described in partial receipt and the second sleeve 812 at least partly accommodating the needle portion 82.Separately Outside, the injector assembly 120 further includes the sleeve part 122 for being socketed in 121 periphery of the nozzle coil.The spring 83 is mounted on In the magnetic portion 81 and the needle portion 82.The needle portion 82 is downward equipped with tapered portion 821 and from the tapered portion 821 The needle 822 of extension.

First sleeve 811 is secured together to be centered around the needle portion 82 with the second sleeve 812 The space 813 of periphery, the needle 822 are equipped with the through-hole 814 being connected with the space 813.The injector assembly 120 also wraps The spinning disk 85 for being fabricated separately and sticking on the valve seat 84 on the valve seat 84 is included, the spinning disk 85 is equipped with several eddy flows Slot 851.The second sleeve 812 is equipped with the connectivity slot 815 for being connected to the space 813 and the eddy flow slot 851.The valve seat 84 Equipped with 822 matched spray-hole 841 of the needle.

Please join shown in Figure 30, the upper end of the magnetic portion 81 be socketed with the 4th sealing ring 816 with the host cavity 322 Inner wall realizes sealing.In addition, the injector assembly 120 further includes the terminal package portion 86 being connect with the nozzle coil 121, institute It states and is socketed with the 5th sealing ring 817 in terminal package portion 86.

The water-cooling subbase 190 includes main part 91, downward through the mounting groove 92 of the main part 91 and described in 91 outwardly extending mounting flange 93 of main part.The mounting flange 93 is equipped with is installed to exhaust pipe 106 by the integrating device 1 Or several first mounting holes 931 on package system 300.The main part 91 is equipped with the 4th upper surface 911 and the 4th side Face 912.4th upper surface 911 is equipped with the accommodating chamber 94 for accommodating the urea nozzle 12 and accommodates the groove of lug boss 52 95。

Cooling duct 141 in water-cooling subbase 190 includes through the first cooling duct of the 4th side 912 913 and with first cooling duct, 913 spaced second cooling duct 914.Wherein, first cooling duct 913 are connected to the inlet attack 103, and second cooling duct 914 is connected to the outlet connection 104.The Water-cooled bottom Seat 190 is equipped with the end cap 96 for the periphery for being sealed in mounting groove 92 (shown in ginseng Figure 33).In illustrative embodiments of the present invention, institute End cap 96 is stated to be welded in mounting groove 92.So set, the water-cooling subbase 190 end cap 96 and the second sleeve 812 it Between form connection the first cooling duct 914 and the second cooling duct 915 annular cooling bath 916.

In illustrative embodiments of the present invention, the mounting flange 93 is formed with 91 one machining of main part.Certainly, In other embodiments, the mounting flange 93 can also be fabricated separately with the main part 91, then be welded together.

Compared to the prior art, integrating device 1 of the invention is a kind of integrated design, can save or shorten existing To connect the urea tube of pump and nozzle in technology, various sensors and line in the pump feed unit of the prior art can also be saved Plug connector between beam can also be not necessarily to heat thawing apparatus, therefore reliability is higher.1 structure of integrating device of the present invention is tight It gathers, it is small, it is convenient for the installation of a variety of models.In addition, interior fluid mediums channel is shorter in the integrating device 1 of the present invention, pressure Drop it is small, pump nozzle between dead volume it is small, efficiency is higher.Sensor 174 is close from nozzle, and injection pressure precision is high.In addition, logical It crosses and pump and nozzle is independently controlled respectively, the action for avoiding nozzle is driven by the action pumped, to improve The accuracy of control.Since the accuracy of spray of nozzle improves, so as to be sparged into the amount and nitrogen oxidation of the urea in exhaust It closes object and reaches suitable ratio, reduce the crystallization risk generated because excessively spraying urea.The integrating device 1 of the present invention can be with Using water cooling, make the urea temperature remained in integrating device 1 that crystalline temperature be not achieved, is not likely to produce crystallization.

Above example is merely to illustrate the present invention and not limits technical solution described in the invention, to this specification Understanding should based on person of ordinary skill in the field, although this specification with reference to the above embodiments to the present invention Detailed description is had been carried out, still, it will be understood by those of ordinary skill in the art that, person of ordinary skill in the field is still Can so modify or equivalently replace the present invention, and all do not depart from the spirit and scope of the present invention technical solution and It is improved, and should all be covered in scope of the presently claimed invention.

Claims (20)

1. a kind of exhaust gas aftertreatment system comprising the spraying system of exhaust aftertreatment and the package system of exhaust aftertreatment, The wherein described package system includes carrier, the spraying system include positioned at the carrier upstream urea injection system and Fuel nozzle positioned at the upstream of the urea injection system, wherein the urea injection system includes a kind of urea pump and urea The integrating device of nozzle, wherein the urea pump to the urea nozzle pump urea liquid, the urea nozzle to Urea is sprayed into the exhaust of engine, it is characterised in that：The integrating device includes shell, is at least partly installed on the shell Internal pump group part and with the matched nozzle assembly of the pump group part, wherein the shell includes being located at the pump group part It upstream and the access road being connected to the pump group part and is connected to positioned at the downstream of the pump group part and with the pump group part Exit passageway, the exit passageway are connected to the nozzle assembly；The pump group part includes driving the electricity of the urea pump Machine coil, the magnetic substance to interact with the electrical-coil and intermeshing first gear component and second gear group Part, wherein the first gear component includes first gear, the second gear component includes second gear, the first gear It is intermeshed with the second gear, the shell is equipped with the gear grooved for accommodating the first gear and the second gear, institute The side of gear grooved is stated equipped with the admission chamber with the inlet passage, the other side of the gear grooved is equipped with and the outlet Channel connection goes out sap cavity；The nozzle assembly includes the nozzle coil for driving the nozzle.

2. exhaust gas aftertreatment system as described in claim 1, it is characterised in that：The carrier includes the bavin being connected to exhaust pipe Oily oxidation catalyst, positioned at the diesel oxidation catalyst downstream diesel particulate filter and be located at the diesel particulate mistake The selective catalytic reducing agent in filter downstream, wherein the fuel nozzle is located at the diesel oxidation catalyst and the diesel oil Between grain filter, the integrating device is between the diesel particulate filter and the selective catalytic reducing agent.

3. exhaust gas aftertreatment system as described in claim 1, it is characterised in that：The exhaust gas aftertreatment system further includes being located at The downstream of the integrating device, the selective catalytic reducing agent upstream mixer.

4. exhaust gas aftertreatment system as described in claim 1, it is characterised in that：The integrating device is additionally provided with to the urea The controller that pump and the urea nozzle are independently controlled respectively, the controller includes circuit board, the electrical-coil It is all connected on the circuit board with the nozzle coil.

5. exhaust gas aftertreatment system as described in claim 1, it is characterised in that：The integrating device include be connected to it is described go out Overflow element between mouth channel and the access road.

6. a kind of exhaust gas aftertreatment system comprising the spraying system of exhaust aftertreatment and the package system of exhaust aftertreatment, The wherein described package system includes carrier, the spraying system include positioned at the carrier upstream urea injection system and Fuel nozzle positioned at the upstream of the urea injection system, wherein the urea injection system includes a kind of urea pump and urea The integrating device of nozzle, wherein the urea pump to the urea nozzle pump urea liquid, the urea nozzle to Urea is sprayed into the exhaust of engine, it is characterised in that：The integrating device includes pump group part and nozzle assembly；The pump Component includes motor case assembly, is at least partially disposed in the motor case assembly magnetic force shade assembly and with the motor The matched pump case assembly of casing assembly；The motor case assembly includes electro-magnetic shielding cover and is at least partially disposed at described Electrical-coil in electro-magnetic shielding cover；The magnetic force shade assembly include the metal cap that is at least partially inserted into the electrical-coil with And it is contained in the rotor in the metal cap；The pump case assembly include positioned at the urea pump upstream and with the urea Pump the access road of connection and positioned at the downstream of the urea pump and the exit passageway that is connected to the urea pump, the outlet Channel is connected with the nozzle assembly；The pump case assembly further includes intermeshing first gear component and second gear Component, wherein the first gear component includes first gear axis and first gear, the second gear component includes second Gear shaft and second gear, the first gear are intermeshed with the second gear, and the rotor is fixed on described first On gear shaft；The pump case assembly is equipped with the gear grooved for accommodating the first gear and the second gear, the gear grooved Side be equipped with admission chamber with the inlet passage, the other side of the gear grooved is equipped with to be connected to the exit passageway Go out sap cavity；The nozzle assembly includes the nozzle coil for driving the nozzle.

7. exhaust gas aftertreatment system as claimed in claim 6, it is characterised in that：The motor case assembly includes to the urine The controller that element pump and the urea nozzle are independently controlled respectively, the controller includes circuit board, the motor lines Circle is all connected to the nozzle coil on the circuit board.

8. exhaust gas aftertreatment system as claimed in claim 6, it is characterised in that：It is additionally provided in the metal cap and turns positioned at described The freeze proof body of the top of son, the freeze proof body can be compressed to absorb because of swelling volume caused by urea icing.

9. exhaust gas aftertreatment system as claimed in claim 8, it is characterised in that：The pump group part further includes being housed in the gold In category cover and the elastomer below the rotor, the elastomer can be compressed to absorb because caused by urea icing Swelling volume.

10. exhaust gas aftertreatment system as claimed in claim 6, it is characterised in that：The pump case assembly is additionally provided with positioned at institute State the first freeze proof stick in admission chamber and positioned at it is described go out sap cavity in the second freeze proof stick, the first freeze proof stick and described the Two freeze proof sticks can be compressed when urea freezes.

11. exhaust gas aftertreatment system as claimed in claim 6, it is characterised in that：The injector assembly includes and the nozzle The magnetic portion of coil interaction, the first sleeve, the valve below the magnetic portion at least partly accommodating the magnetic portion Needle portion, the second sleeve at least partly accommodating the needle portion, act on spring between the magnetic portion and the needle portion, With the needle portion cooperation valve seat and the spinning disk on the valve seat, the rotation are fabricated separately and sticked on the valve seat Flow is equipped with several eddy flow slots.

12. exhaust gas aftertreatment system as claimed in claim 11, it is characterised in that：The nozzle coil is located at the magnetic portion Periphery, the needle portion is equipped with needle, and mutually fixation is centered around the valve to be formed for first sleeve and the second sleeve The space of the periphery in needle portion, the needle are equipped with the through-hole being connected with the space, and the second sleeve is equipped with described in connection The connectivity slot in space and the eddy flow slot, the valve seat are equipped with and the matched spray-hole of the needle.

13. exhaust gas aftertreatment system as claimed in claim 6, it is characterised in that：The motor case assembly is equipped with and is molded into The connector of type, the connector are electrically connected with the circuit board, and the circuit board is equipped with several electronic components, described Motor case assembly further includes the cooling pad for being covered in the electronic component surface.

14. exhaust gas aftertreatment system as claimed in claim 6, it is characterised in that：The magnetic force shade assembly includes positioned at described Plate portion below metal cap, the plate portion are fixed on by several screws on the pump case assembly.

15. exhaust gas aftertreatment system as claimed in claim 14, it is characterised in that：The pump case assembly includes first shell Body, the first shell includes the first upper surface, the first lower surface and first side, wherein first upper surface is equipped with the One annular groove, by the first island portion that the first annular slot surrounds and the first sealing being housed in the first annular slot Circle, the plate portion compresses downwards first sealing ring；First island portion is equipped with first through first lower surface Location hole and second location hole through first lower surface, the urea pump include being housed in the first positioning hole The first axle sleeve and the second axle sleeve for being housed in the second location hole, wherein the first gear axis is inserted into described first In axle sleeve, the second gear axis is inserted into second axle sleeve.

16. exhaust gas aftertreatment system as claimed in claim 15, it is characterised in that：First island portion further includes through described First upper surface and the first diversion trench for being connected to the second location hole and through first upper surface and with go out sap cavity The first outlet hole of connection；First upper surface is additionally provided with the side positioned at first island portion and to accommodate sensor Sensor accepting hole, the integrating device include sensor to detect temperature and pressure；The first shell is additionally provided with and institute State the second outlet hole that sensor accepting hole is connected.

17. exhaust gas aftertreatment system as claimed in claim 16, it is characterised in that：The first shell is received equipped with overflow element Tank, the integrating device are equipped with the overflow element being installed in the overflow element container；When the pressure of the exit passageway When power is higher than setting value, the overflow element is opened to return to part urea liquid in the access road.

18. exhaust gas aftertreatment system as claimed in claim 15, it is characterised in that：The pump case assembly includes positioned at described The lower section of first shell and the second shell being connect with the first shell, the second shell include the second upper surface and the Two lower surfaces, the gear grooved is through second upper surface and the second lower surface.

19. exhaust gas aftertreatment system as claimed in claim 18, it is characterised in that：The pump case assembly includes positioned at described The lower section of second shell and the third shell being connect with the second shell, the third shell include body part and from described in The lug boss that body part extends downwardly, wherein the body part is equipped with third upper surface, the third upper surface is equipped with third ring Shape slot and the third island portion surrounded by the third annular groove.

20. exhaust gas aftertreatment system as claimed in claim 12, it is characterised in that：The nozzle assembly include injector assembly with And it is socketed in the water-cooling subbase of the outside of the injector assembly, the water-cooling subbase is equipped with mounting groove, the first cooling duct and institute It states spaced second cooling duct in the first cooling duct and is sealed in the end cap of the periphery of the mounting groove, the nozzle Assembly forms between the end cap and the second sleeve is connected to first cooling duct and second cooling duct Annular cooling bath, first cooling duct connect with inlet attack with so that engine coolant injects, and described second is cold But channel is connect with outlet connection with so that engine coolant flows out.