CN106150621B - Urea ejection assemblies - Google Patents

Abstract

A kind of urea ejection assemblies, it includes shell, wire harness assembly and pump assembly, the pump assembly includes pump case and the pump in the pump case, the pump case includes the lug boss upwardly extended, and the lug boss includes upper and lower perforative groove, the stopper section positioned at the groove side and the second jack for extending upward through；The shell is equipped with installation base, and the installation base includes recess, the stop wall above the recess and the first jack below the recess；The wire harness assembly includes the first pressure sensor being mounted on the lug boss and the second pressure sensor being mounted on the installation base, it is buckled in the groove after the first pressure sensor rotation, it is buckled in the recess after the second pressure sensor rotation, solves the problems, such as sensor installation positioning.

Description

Urea ejection assemblies

Technical field

The present invention relates to a kind of urea ejection assemblies, belong to motor exhaust post-processing technology field.

Background technique

Existing urea injection system include air-assisted and non-air assist type.Wherein, non-air assist type Urea injection system generally include pump, filter, with pump connection metering jet and several sensors.This urea injection system It unites often very high to the requirement of metering jet, since metering jet is mounted on exhaust pipe, is easy shadow due to by the high temperature being vented Measuring accuracy is rung, or even is burnt out by high temperature.In addition, urea liquid can freeze under cold conditions, and volume expansion, thus it is how right Remaining urea liquid is emptied in system, the risk and this system problem to be solved that reduction system is damaged by frost.

The urea injection system of air-assisted introduces compressed air into, to improve the effect of urea atomization, Obtain the favor of numerous manufacturers.

But because number of sensors is more, how technology existing for installation positioning and industry is carried out to them and asked Topic.

Summary of the invention

The purpose of the present invention is to provide the urea ejection assemblies that a kind of sensor is easily installed positioning.

To achieve the above object, the present invention adopts the following technical scheme: a kind of urea ejection assemblies comprising shell, line It tread assembly and is installed in the shell and the pump assembly to pump urea liquid, the shell include bottom wall, the first side Wall and be fixed on the first side wall and extend outwardly beyond the urea inlet union of the first side wall, urea outlet connect Head, gas inlet adapter, gas outlet joint and wiring harness connector, wherein the wiring harness connector is connected with the wire harness assembly, The pump assembly is mounted on the bottom wall, and the pump assembly includes pump case and the pump in the pump case, and the pump is set There are import and outlet, the pump case includes the lug boss upwardly extended, and the lug boss includes upper and lower perforative groove, is located at The stopper section of the groove side and the second jack extended upward through；The shell is equipped with installation base, the installation base Including recess, the stop wall above the recess and the first jack below the recess；The wire harness assembly It is sensed including the first pressure sensor being mounted on the lug boss and the second pressure being mounted on the installation base Device, the first pressure sensor include the first main part, extend downward beyond the first test section of first main part with And the first positioning protrusion extended downwardly from first main part, first test section are housed in second jack, It is buckled in the groove after the first positioning protrusion rotation, the stopper section limits first positioning in the vertical direction Protrusion moves upwards；The second pressure sensor includes the second main part, extends downward beyond the of second main part Two test sections and the second positioning protrusion extended downwardly from second main part, second test section are housed in described In one jack, it is buckled in the recess after the second positioning protrusion rotation, the stop wall limits institute in the vertical direction The second positioning protrusion is stated to move upwards.

Technical solution as a further improvement of that present invention, the second pressure sensor include from second main part The third positioning protrusion to extend back, the shell be additionally provided with positioned at first jack lower right screw hole and be mounted on Screw in the screw hole, the screw can interfere with the third positioning protrusion, to prevent the second pressure from sensing Device rotation.

Technical solution as a further improvement of that present invention, the first pressure sensor and the second pressure sensor Structure it is identical.

Technical solution as a further improvement of that present invention, the shell are rectangle, and the pump assembly edge is parallel to this Rectangular diagonal line inclination installation.

Technical solution as a further improvement of that present invention, the pump case include the first pump case and with first pump case The second pump case matched, first pump case include the first auxiliary section and extend forward from first auxiliary section first Extension, the lug boss are upwardly extended from first extension, and first auxiliary section includes on its interior Chamber, the first recessed portion for being connected with the chamber and the air flue below first recessed portion, described first prolongs Extending portion is equipped with channel that is pre-and post perforative and being connected to first recessed portion, and the outlet of the pump is connected with the channel, and Second jack is also connected with the channel.

Technical solution as a further improvement of that present invention, first pump case are made of metal material, second pump Shell is made of insulating material.

Technical solution as a further improvement of that present invention, it is described pump be plunger pump comprising reset spring, with it is described multiple Position spring be pressed against each other piston component, positioned at the piston component front end check valve assembly, be wrapped in outside the piston component The connected contact pin of the coil and the coil enclosed；Second pump case includes contact pin portion, and the contact pin passes through the contact pin portion.

Technical solution as a further improvement of that present invention, second pump case include mutually fixing with first auxiliary section The second auxiliary section and the second extension for extending back from second auxiliary section, second extension, which is equipped with, runs through institute The first adapter tube and the second adapter tube stating the second recessed portion of the second auxiliary section and extending back from second recessed portion, wherein First adapter tube is connected with the import of the pump, and second adapter tube is matched with the air flue.

Technical solution as a further improvement of that present invention, the shell are equipped with the installation to accommodate filter assemblies Portion, the mounting portion be equipped with first first through hole that matches of adapter tube and be located at below the first through hole and with institute State the second through-hole that the second adapter tube matches.

Technical solution as a further improvement of that present invention, the urea ejection assemblies include being located at first extension The rubber sheet gasket of lower section, the pump assembly include the fixed ring to be fixed to the pump case on the bottom wall.

Compared to the prior art, first pressure sensor and second pressure sensor are separately mounted to lug boss by the present invention And on installation base, and fixed by rotation, solves the problems, such as installation positioning.

Detailed description of the invention

Fig. 1 is the stereoscopic schematic diagram of urea ejection assemblies of the present invention.

Fig. 2 is the stereoscopic schematic diagram of another angle of Fig. 1.

Fig. 3 is the part isometric schematic diagram of Fig. 1, wherein not showing upper housing.

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

Fig. 5 is the part isometric exploded view of Fig. 3.

Fig. 6 is the part isometric exploded view of another angle of Fig. 5.

Fig. 7 is the further stereogram exploded view of Fig. 6.

Fig. 8 is the further stereogram exploded view of Fig. 7.

Fig. 9 is the part isometric exploded view of Fig. 3.

Figure 10 is the top view of lower case in Fig. 3.

Figure 11 is the perspective view of rubber sheet gasket in Fig. 6.

Figure 12 is the perspective view of pump assembly in Fig. 3.

Figure 13 is the perspective view of another angle of Figure 12.

Figure 14 is the perspective view of the another angle of Figure 12.

Figure 15 is the stereogram exploded view of Figure 12.

Figure 16 is the diagrammatic cross-section of Figure 15.

Figure 17 is the diagrammatic cross-section of pump assembly in Figure 12.

Figure 18 is the perspective view of first pressure sensor in Fig. 3.

Figure 19 is the perspective view of second pressure sensor in Fig. 3.

Figure 20 is top view of first, second pressure sensor at initial makeup location in Fig. 3.

Figure 21 is top view of the first, second pressure sensor in Fig. 3 in final installed position.

Figure 22 is the cross-sectional view of the line A-A along Fig. 4, and has marked flow direction.

Figure 23 is the partial enlarged view of circled portion in Figure 22.

Figure 24 is Figure 23 similar, but does not show the first connecting pipe component.

Figure 25 is the cross-sectional view of the line B-B along Fig. 4, and has marked flow direction.

Figure 26 is the cross-sectional view of the line C-C along Fig. 4, and has marked flow direction.

Figure 27 is the cross-sectional view of the line D-D along Fig. 4, and has marked flow direction.

Specific embodiment

Please join shown in Fig. 1 to Fig. 9, present invention discloses a kind of urea ejection assemblies 100 comprising shell 1, be located at it is described Filter assemblies 2 in shell 1, the pump assembly 3 to pump urea liquid, have heating defrosting function heating component 4, with And wire harness assembly 6 etc..In illustrative embodiments of the present invention, the urea ejection assemblies 100 are applied to air-assisted In urea ejection assemblies comprising fluid path 101(joins shown in the filled arrows in Fig. 4) and gas circuit 102(join it is hollow in Fig. 4 Shown in arrow).It is sprayed it is appreciated that the fluid path 101 is finally pooled at nozzle (not shown) with gas circuit 102 into exhaust pipe The urea liquid of atomization carries out purified treatment to exhaust.It is generally included as the binding mode of the fluid path 101 and gas circuit 102 Mixed two ways outside interior mixing, these be for person of ordinary skill in the field it is well known, details are not described herein.

In illustrative embodiments of the present invention, the shell 1 includes lower case 11 and passes through spiral shell with the lower case The upper housing 12 that silk 10 is assembled.It please join shown in Fig. 3, the top of the lower case 11 is equipped with annular notch 111 and clamping Sealing ring 112 in the annular notch 111, to improve upper housing 12 and the sealing performance of lower case 11 after assembling.

It please join shown in Fig. 5, the lower case 11 substantially cuboid comprising bottom wall 13 and be connected with the bottom wall 13 Four side walls.Four side walls include the first side wall 14, the second sidewall 15 opposite with the first side wall 14, connect institute State the first side wall 14 and the third side wall 16 of the second sidewall 15 and fourth side wall 17 opposite with the third side wall 16. The bottom wall 13 surrounds an accommodating space 18 with four side walls jointly, to accommodate filter assemblies 2, pump assembly 3, add Hot component 4 and wire harness assembly 6 etc..The first side wall 14 is equipped with the first mounting hole 141, the second mounting hole 142, third installation Hole 143 and harness hole 144.In illustrative embodiments of the present invention, first mounting hole 141, the second mounting hole 142 with And third mounting hole 143 is round hole, the harness hole 144 is square hole.Wherein, first mounting hole 141 is to install Urea outlet connection 145, second mounting hole 142 are used to install gas inlet adapter 146, the third mounting hole 143 To install gas outlet joint 147, the harness hole 144 is to installation wiring connector 148.In addition, the lower case 11 is also set There is the urea inlet union 149 with 14 injection molding of the first side wall.

In illustrative embodiments of the present invention, the urea outlet connection 145, gas inlet adapter 146, gas vent Connector 147, wiring harness connector 148 and urea inlet union 149 are respectively positioned on the same side of the shell 1, in order to assemble.Separately Outside, the urea inlet union 149 is close to the third side wall 16, and the urea outlet connection 145 is close to the 4th side wall 17.The gas inlet adapter 146 is located at the urea outlet connection 145 and the urea with the gas outlet joint 147 Between inlet union 149, wherein the gas inlet adapter 146, close to the urea outlet connection 145, the gas vent connects First 147 close to the urea inlet union 149, moves towards phase with generally make the trend of the fluid path 101 and the gas circuit 102 Instead.The wiring harness connector 148 is between the urea outlet connection 145 and the gas inlet adapter 146.

It please join shown in Fig. 6, Figure 10 and Figure 24, the urea outlet connection 145 includes head 1451, from the head 1451 necks 1452 extended downwardly, the latch portion 1453 that extends downwardly from the neck 1452 and from the latch portion 1453 The outlet 1454 extended downwardly.The head 1451 is wider than other parts, in order to pacify when other parts by described first When filling hole 141, fix the head 1451 in the inside of the first side wall 14.The head 1451 is equipped with the first recess 1455.The neck 1452 is held in first mounting hole 141, and the neck 1452 is equipped with and first recess 1455 Second recess 1456 of connection.The periphery of the latch portion 1453 is equipped with and matches external screw thread 1457, the lock with nut 1459 The inside of buckle 1453 is equipped with the accepting hole 1458 being connected to the outlet 1454.

It please join shown in Fig. 6, the bottom wall 13 is equipped with spaced a pair of of convex block 131 and is formed in this to convex block 131 Between holding tank 132, wherein each convex block 131 be all provided with the inclined concave surface 133 of the oriented holding tank 132 and be located at institute State the fixation hole 134 in 133 outside of concave surface.In illustrative embodiments of the present invention, the bottom of the holding tank 132 just with institute The upper surface for stating bottom wall 13 is concordant.The holding tank 132 is substantially arranged along 45 degree of overturning angles.

The lower case 11 further includes the mounting portion 19 close to the third side wall 16, and the mounting portion 19 connects described the One side wall 14 and the second sidewall 15.The mounting portion 19 is equipped with the accommodating chamber being connected to the urea inlet union 149 191, and the accommodating chamber 191 runs through the second sidewall 15.The mounting portion 19 is additionally provided with close to the second sidewall 15 And the second through-hole 193 towards the first through hole 192 of the holding tank 132 and positioned at 192 lower section of first through hole, wherein The first through hole 192 is arranged side by side in the vertical direction with second through-hole 193.In illustrative embodiments of the present invention In, the first through hole 192 is equally arranged along 45 degree of overturning angles with second through-hole 193.In addition, the mounting portion 19 also wraps The outlet passageway 194 being connected to second through-hole 193 is included, the outlet passageway 194 connects with the gas outlet joint 147 It is logical.The mounting portion 19 is equipped with the installation base 195 close to the first side wall 14.The installation base 195 includes to described The open recess 1951 of 4th side wall 17 and the stop wall 1952 above the recess 1951, the recess 1951 be to It is upper perforative.The mounting portion 19 be additionally provided with the first jack 1953 for being connected to and extending upward through with the outlet passageway 194 and Screw hole 1954 positioned at 1953 lower right of the first jack.

It please join shown in Fig. 7 and Figure 25, the filter assemblies 2 include the filling being successively housed in the accommodating chamber 191 Block 21, the filter core 22 above the filling block 21 and the lid 23 matched with the filter core 22.It is illustrated in the present invention Embodiment in, the lid 23 and the mounting portion 19 are using being threadedly engaged, with easy to disassemble, be conveniently replaceable filter core 22, Save maintenance cost.It please join shown in Figure 20, filter assemblies 2 of the invention are outside into interior formula out, i.e., when in use, urea liquid It circulates upwards from the gap between the filling block 21 and the accommodating chamber 191, then ecto-entad permeates urea liquid again The filter core 22 is crossed, is finally left from outlet 231, into the first through hole 192.

It should be noted that under cold conditions, urea liquid can freeze, volume expansion.Exist to reduce urea liquid The risk of the mounting portion 19 may be burst after icing, present invention employs anti-freeze designs, that is, increase the filling block 21. In addition, correspondingly, just becoming in the accommodating chamber 191 to accommodate the volume of urea liquid because increasing the filling block 21 Small, this reduces the requirements of the pumpability to pump assembly 3, simplify design.In illustrative embodiments of the present invention, The filling block 21 is non-deformable duroplasts, to save cost.It will be appreciated, of course, that in other embodiments, it is described Filling block 21 can also be using the soft material with certain elasticity.

It please join shown in Fig. 4, the pump assembly 3 is inclined in the shell 1, substantially right with one of the shell 1 Linea angulata is parallel.Please join shown in Figure 12 to Figure 17, the pump assembly 3 include pump case 31, the pump 32 in the pump case 31 and To the fixed ring 33 being fixed to the pump case 31 on the bottom wall 13.The pump case 31 can play the pump 32 in it good Good protective effect.

The pump case 31 includes the first pump case 311 and the second pump case 312 matched with first pump case 311.? In illustrative embodiments of the present invention, first pump case 311 is made of metal material, and is on the one hand able to bear at pump discharge High pressure；On the other hand convenient for heat dissipation, to reduce influence of the heat to the precision of pump 32；Second pump case 312 is substantially by exhausted Edge material (such as plastics) is made, and the contact pin 321 convenient for pump 32 passes through, and avoids short circuit, is detailed later.Though it should be noted that Right second pump case 312 is substantially made of insulating material, but in order to improve assembly intensity, it can be in the position of screw hole Place's insertion tool internal thread metal nuts.

First pump case 311 includes the first auxiliary section 313, integrally extend forward from first auxiliary section 313 the One extension 314 and the lug boss 315 upwardly extended from first extension 314.First auxiliary section 313 includes position The chamber 3131 in portion, the first recessed portion 3132 for being connected with the chamber 3131 and it is located at first recessed portion in the inner The air flue 3133 of 3132 lower sections.It please join shown in Figure 14, first auxiliary section 313 further includes positioned at the protrusion 3134 of side, institute Stating protrusion 3134 includes being located in the middle air inlet 3135 and the threaded hole positioned at the upper and lower two sides of the air inlet 3135 3136.In illustrative embodiments of the present invention, the air inlet 3135 is connected to the chamber 3131, and the chamber 3131 is again It is connected to the air flue 3133, is connected to the air inlet 3135 with the air flue 3133.It please join shown in Figure 15 and Figure 16, First pump case 311 further includes the check valve 3137 being contained in the air flue 3133.It please join shown in Figure 17, scheme in the present invention In the embodiment shown, the air flue 3133 includes horizontal air flue 3138 and vertical air flue 3139, wherein the check valve 3137 are housed in the horizontal air flue 3138.

First extension 314 is equipped with channel 3141 that is pre-and post perforative and being connected to first recessed portion 3132. The air flue 3133 forward and upwardly extends, to be connected to channel 3141.In addition, first extension 314 is additionally provided with and is located at The recess 3142 of 3133 two sides of air flue.The lug boss 315 include the groove 3151 that is opened to the 4th side wall 17 with And the stopper section 3152 positioned at 3151 side of groove, the groove 3151 are perforative up and down.The lug boss 315 is also set There is the second jack 3153 for being connected to and extending upward through with the channel 3141.

Second pump case 312 includes the second auxiliary section 316, extends back from the upper end of second auxiliary section 316 Contact pin portion 317 and the second extension that 317 lower section of contact pin portion is extended back and be located at from second auxiliary section 316 318.Connection is realized by being located at the bolt 319 in four corners with first auxiliary section 313 in second auxiliary section 316.For Reinforcement leakproofness, second auxiliary section 316 are equipped with the mounting groove 3161 for being looped around its end face and are held in the installation Sealing ring 3162 in slot 3161.Second extension 318 is equipped with the second recessed portion through second auxiliary section 316 3181, the first adapter tube 3182 and the second adapter tube 3183 to extend back from second recessed portion 3181, wherein described first Adapter tube 3182 is located at the upper end of second adapter tube 3183, and second adapter tube 3183 is connected with the air flue 3133.

It please join shown in Figure 16 and Figure 17, in illustrative embodiments of the present invention, the pump 32 is plunger pump comprising multiple Position spring 322, be pressed against each other with the reset spring 322 piston component 323, positioned at the unidirectional of 323 front end of piston component Valve module 324 and the coil 325 for being wrapped in 323 periphery of piston component, the contact pin 321 are connected with the coil 325, To provide electric power.The pump 32 is equipped with the outlet 327 positioned at the import 326 of its rear end and positioned at its front end.

It please join shown in Fig. 9, the fixed ring 33 includes that the first press section 331 and first press section 331 interval are arranged The second press section 332 and connection first press section 331 and second press section 332 a pair of of department of assembly 333, Wherein first press section 331 all has the inner surface of arc-shaped with second press section 332 to extend with described first Portion 314 matches.The centre of first press section 331 and second press section 332 has hollow-out parts 334, the protrusion Portion 315 extends up through the hollow-out parts 334.The department of assembly 333 is substantially in tabular comprising with the fixation hole 134 corresponding mounting holes 335.

It please join shown in Figure 17, when assembling, the front end of the pump 32 is contained in first recessed portion 3132, the pump 32 Rear end be contained in second recessed portion 3181, it is described pump 32 import 326 be connected to first adapter tube 3182, it is described The outlet 327 of pump 32 is connected to the channel 3141.

Further, when the pump case 31 to be installed in the lower case 11, first adapter tube 3182 is contained in In the first through hole 192, second adapter tube 3183 is contained in second through-hole 193.Finally, being worn using screw 336 The mounting hole 335 and corresponding fixation hole 134 are crossed, the pump case 31 is fixed by the fixed ring 33.

It should be noted that in illustrative embodiments of the present invention, when the pump case 31 is installed to the lower case When on 11, it may be implemented to position by first adapter tube 3182 and second adapter tube 3183.In order to avoid excessively fixed Position, in illustrative embodiments of the present invention, the shell 1 further includes being located at 132 top of holding tank and being supported on described Rubber sheet gasket 135 on concave surface 133.The rubber sheet gasket 135 has the upper surface 1351 of arc-shaped and is located at the upper table The first positioning region 1352 and the second positioning region 1353 of 1351 two sides of face.The upper surface 1351 of the arc-shaped is to support State the first extension 314 of pump case 31.First positioning region 1352 and second positioning region 1353 extend downwardly, and Respectively to be held in the rear and front end of each convex block 131.The rubber sheet gasket 135 has certain elasticity, can absorb Vibration, avoided positioning etc..

It please join shown in Fig. 4 to Fig. 9, Figure 23, Figure 24, the urea ejection assemblies 100 further include connecting the channel 3141 With the first connecting pipe component 51 of the urea outlet connection 145.First connecting pipe component 51 includes being contained in the receipts Hold the throttle valve 511 in hole 1458, be contained in first recess 1455 and first end 512 in the second recess 1456, The first of the second end 513 and the connection first end 512 and the second end 513 that are contained in the channel 3141 Connecting tube 514.In order to reinforce sealing, sealing ring 515 is equipped on the first end 512 and the second end 513.In this hair In bright embodiment illustrated, the first end 512 and first connecting tube 514 are two elements being provided separately, institute It states first end 512 and is equipped with the first hangnail portion 5121 being inserted into first connecting tube 514；Similarly, the second end 513 are equipped with insertion described first with first connecting tube 514 and two elements being provided separately, the second end 513 The second hangnail portion 5131 in connecting tube 514.

Please join shown in Figure 23, the urea outlet connection 145 is connected to first connecting pipe component 51, with for The urea liquid being pumped out passes through.32 are pumped at the initial stage for building pressure due to described, the pressure of pump discharge is smaller, therefore in order to The pressure of enough quickly identification pump discharges, is provided with throttle valve 511 in illustrative embodiments of the present invention.It is appreciated that when setting Outlet pressure can be improved later by setting throttle valve 511.

In addition, please join shown in Fig. 4 to Fig. 9 and Figure 26, the urea ejection assemblies 100 further include connecing with the gas feed Second connecting pipe component 52 of first 146 connection.

Please join shown in Fig. 4 to Fig. 9, the heating component 4 be coated on the first heating blanket 41 on the mounting portion 19, The second heating blanket 42 and third heating blanket 43 being connected by harness 40 with first heating blanket 41, wherein described first adds Hot blanket 41, second heating blanket 42 and the third heating blanket 43 are arranged in series.The heating component 4 finally with the line Tread assembly 6 connects, to provide electric power.In illustrative embodiments of the present invention, first heating blanket 41, which is additionally provided with, to be coated on The first through hole 192 and the shoulder 411 on second through-hole 193.Second heating blanket 42 is wrapped in first pump In the recess 3142 of 311 two sides of shell, is heated, thawed with the urea liquid to pump discharge.The third heating blanket 43 wraps up In first connecting tube 514, to realize heating, thaw.It please join shown in Fig. 3, the heating component 4 further includes positioned at described The gasket 44 of the upper/lower terminal of first heating blanket 41, the gasket 44 can be in 12 groups of the lower cases 11 and the upper housing First heating blanket 41 is fixed after dress.

The wire harness assembly 6 includes the air pressure valve 61 being mounted on the pump case 31, is mounted on the lug boss 315 First pressure sensor 62 and the second pressure sensor 63 being mounted on the installation base 195.The wherein air pressure valve 61 screw by being fixed in the threaded hole 3136 realizes fixation.The air pressure valve 61 is connected to the air inlet 3135, One end of second connecting pipe component 52 is connect with the gas inlet adapter 146, and the other end is connect with the air pressure valve 61.

It please join shown in Fig. 4 and Figure 18, the first pressure sensor 62 is mounted on the exit of fluid path 101, to detect Mouth pressure.The first pressure sensor 62 includes the first main part 621, extends downward beyond first main part 621 First test section 622, the sealing ring 623 being socketed on first test section 622 and from first main part 621 to First positioning protrusion 624 of lower extension.Please join shown in Figure 20 and Figure 21, when assembling, first by first test section 622 together with Sealing ring 623 is inserted into second jack 3153, then rotates the first pressure sensor 62 to the groove 3151, It is buckled in first positioning protrusion 624 in the groove 3151.At this point, the stopper section 3152 can be in the vertical direction It limits first positioning protrusion 624 to move upwards, to play limit function.

Similarly, please join shown in Fig. 4 and Figure 19, the second pressure sensor 63 is mounted on the exit of gas circuit 102, with Detect outlet pressure.The second pressure sensor 63 includes the second main part 631, extends downward beyond second main part 631 the second test section 632, the sealing ring 633 being socketed on second test section 632, from second main part 631 to Second positioning protrusion 634 of lower extension and the third positioning protrusion 635 to extend back from second main part 631.It please join Shown in Figure 20 and Figure 21, when assembling, second test section 632 is inserted into first jack together with sealing ring 633 first In 1953, the second pressure sensor 63 is then rotated into (such as rotating clockwise) to the recess 1951, makes described Two positioning protrusion 634 are buckled in the recess 1951.At this point, the stop wall 1952 can limit in the vertical direction it is described Second positioning protrusion 634 moves upwards, to play limit function.Then, screw 1955 is fixed on the screw hole 1954 In.So set, the screw 1955 can interfere with the third positioning protrusion 635, to prevent the second pressure from sensing The rotation of device 63 (such as rotation counterclockwise), is detached from the stop wall 1952.

It please join shown in Figure 18 to Figure 21, in illustrative embodiments of the present invention, the first pressure sensor 62 and institute It is identical to state 63 structure of second pressure sensor, to save cost.The air pressure valve 61, the first pressure sensor 62 and institute The circuit part for stating second pressure sensor 63 passes through winding displacement and connect with the wiring harness connector 148.

It please join shown in Figure 22, Figure 25 to Figure 27, wherein block arrow represents the flow direction of urea liquid, and solid thin arrows represent The flow direction of air, thin dotted arrow represent the flow direction of air when emptying.When the urea ejection assemblies 100 work, For the trend of fluid path 101, under the drive of the pump 32, urea liquid enters the filtering from urea inlet union 149 Then device assembly 2 enters back into first through hole 192, and is pressurized and is output in channel 3141 under the action of the pump 32, then Into the first connecting tube 514, by throttle valve 511, finally left from the urea outlet connection 145.

For the trend of gas circuit 102, compressed air enters from gas inlet adapter 146, by air pressure valve 61, from air inlet Hole 3135 enters chamber 3131.(non-clear) in general, the check valve 3137 are closed, i.e., the described air flue 3133 closes It closes.It please join shown in Figure 22, at this point, compressed air can only enter the second adapter tube 3183, it is logical subsequently into the second through-hole 193 and outlet Road 194 finally leaves from gas outlet joint 147.

Under empty, it please join shown in Figure 22, check valve 3137 is opened at this time, and at least part compressed air enters institute State shown in air flue 3133(ginseng dotted arrow), the channel 3141 is then imported, is gone out to pump is located on urea flow direction The subsequent pipeline of mouth is emptied, and the risk that urea freezes is reduced.

It should be noted that due to increasing filling block 21 in the present invention, to accommodate urea in the accommodating chamber 191 The volume of solution just becomes smaller, and in this case, even if not emptying to the pipeline of the outlet front of pump, can also pass through Low-temperature test thus greatly reduces the cost of system design.

Above embodiments are merely to illustrate the present invention and not limit the technical scheme described by the invention, to this specification Understanding should be based on person of ordinary skill in the field, such as to "front", "rear", "left", "right", "upper", "lower" The description of isotropy, although this specification is referring to the above embodiments, the present invention has been described in detail, this Field it is to be appreciated by one skilled in the art that person of ordinary skill in the field still can modify to the present invention or Equivalent replacement, and all do not depart from the technical solution and its improvement of the spirit and scope of the present invention, should all cover of the invention In scope of the claims.

Claims (10)

1. a kind of urea ejection assemblies comprising shell, wire harness assembly and be installed in the shell and to pump urea The pump assembly of solution, the shell include bottom wall, the first side wall and are fixed on the first side wall and extend outwardly beyond Urea inlet union, urea outlet connection, gas inlet adapter, gas outlet joint and the harness of the first side wall connect Head, wherein the wiring harness connector is connected with the wire harness assembly, the pump assembly is mounted on the bottom wall, it is characterised in that: The pump assembly includes pump case and the pump in the pump case, and the pump is equipped with import and outlet, and the pump case includes The lug boss upwardly extended, the lug boss include upper and lower perforative groove, positioned at the groove side stopper section and to Upper perforative second jack；The shell is equipped with installation base, and the installation base includes recess, above the recess Stop wall and the first jack below the recess；The wire harness assembly includes first be mounted on the lug boss Pressure sensor and the second pressure sensor being mounted on the installation base, the first pressure sensor include first Main part, the first test section for extending downward beyond first main part and extended downwardly from first main part Positioning protrusion, first test section are housed in second jack, are buckled in institute after the first positioning protrusion rotation It states in groove, the stopper section limits first positioning protrusion in the vertical direction and moves upwards；The second pressure sensing Device include the second main part, extend downward beyond second main part the second test section and from second main part to Second positioning protrusion of lower extension, second test section are housed in first jack, the second positioning protrusion rotation After be buckled in the recess, the stop wall limits second positioning protrusion in the vertical direction and moves upwards.

2. urea ejection assemblies as described in claim 1, it is characterised in that: the second pressure sensor includes from described The third positioning protrusion that two main parts extend back, the shell be additionally provided with the screw hole positioned at first jack lower right with And it is mounted on the screw in the screw hole, the screw can interfere with the third positioning protrusion, to prevent described second Pressure sensor rotation.

3. urea ejection assemblies as described in claim 1, it is characterised in that: the first pressure sensor and second pressure The structure of force snesor is identical.

4. urea ejection assemblies as described in claim 1, it is characterised in that: the shell is rectangle, the pump assembly edge It is parallel to the rectangular diagonal line inclination installation.

5. urea ejection assemblies as claimed in claim 4, it is characterised in that: the pump case include the first pump case and with it is described The second pump case that first pump case matches, first pump case include the first auxiliary section and prolong forward from first auxiliary section The first extension stretched, the lug boss are upwardly extended from first extension, and first auxiliary section includes position The chamber in portion, the first recessed portion for being connected with the chamber and the air flue below first recessed portion in the inner, institute It states the first extension and is equipped with channel that is pre-and post perforative and being connected to first recessed portion, the outlet of the pump and the channel It is connected, and second jack is also connected with the channel.

6. urea ejection assemblies as claimed in claim 5, it is characterised in that: first pump case is made of metal material, institute The second pump case is stated to be made of insulating material.

7. urea ejection assemblies as claimed in claim 6, it is characterised in that: the pump is plunger pump comprising reset spring, The piston component that is pressed against each other with the reset spring, positioned at the piston component front end check valve assembly, be wrapped in the work The coil of plug assembly periphery and the contact pin being connected with the coil；Second pump case includes contact pin portion, and the contact pin passes through The contact pin portion.

8. urea ejection assemblies as claimed in claim 5, it is characterised in that: second pump case includes and described first cooperates The second auxiliary section and the second extension to extend back from second auxiliary section, second extension that portion is mutually fixed are set The first adapter tube and second for having the second recessed portion for running through second auxiliary section and extending back from second recessed portion Adapter tube, wherein first adapter tube is connected with the import of the pump, second adapter tube is matched with the air flue.

9. urea ejection assemblies as claimed in claim 8, it is characterised in that: the shell is equipped with to accommodate filter assemblies Mounting portion, the mounting portion is equipped with and first first through hole that matches of adapter tube and is located at below the first through hole And the second through-hole matched with second adapter tube.

10. urea ejection assemblies as claimed in claim 5, it is characterised in that: the urea ejection assemblies include positioned at described Rubber sheet gasket below first extension, the pump assembly include the fixation to be fixed to the pump case on the bottom wall Ring.