CN106762048A - Pumping unit and the urea liquid feed system and method for SCR system crystallization-preventive - Google Patents
Pumping unit and the urea liquid feed system and method for SCR system crystallization-preventive Download PDFInfo
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- CN106762048A CN106762048A CN201710038041.3A CN201710038041A CN106762048A CN 106762048 A CN106762048 A CN 106762048A CN 201710038041 A CN201710038041 A CN 201710038041A CN 106762048 A CN106762048 A CN 106762048A
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- Prior art keywords
- check valve
- urea liquid
- unit
- fluid hole
- pumping unit
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1433—Pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The present invention provides a kind of pumping unit, it is made up of check valve upper body and check valve lower body, check valve lower body is provided with the first inlet opening and the first fluid hole communicated with the external world away from one end of check valve upper body, and check valve upper body is provided with hydraulic structure away from one end of check valve lower body；Check valve diaphragm is set between check valve upper body and check valve lower body, it is formed with the gap for making the first inlet opening be connected with the second inlet opening when being contacted with check valve upper body, when being contacted with check valve lower body, it is formed with the gap for making the first fluid hole be connected with the second fluid hole between the two, therefore this pumping unit is the characteristics of have precise control dosage.In urea liquid feed system and method for SCR system crystallization-preventive that the present invention is also provided, due to being provided with reversing unit, pipeline can be made carries out suck-back more by the urea liquid for absorbing in pipeline before, crystallization is produced during unnecessary urea liquid remains in pipeline and jet module so as to avoid, the risk of pipeline blockage is reduced.
Description
Technical field
The present invention relates to vehicle-mounted SCR system, more particularly to a kind of pumping unit and a kind of urine for SCR system crystallization-preventive
Plain solution feeding system and method.
Background technology
SCR (Selective Catalytic Reduction) is a kind of SCR technology, and SCR technology makes
It is water-soluble using ammonia or urea under uniform temperature and catalyst action with ammonia or aqueous solution of urea as reducing substances
Liquid is by NOXIt is reduced to the nitrogen and water of environmental sound.Due to the preferential reduction NO of ammonia selectivity in the presence of catalystX
Without prior to O2Reaction, therefore it is called " SCR ".Ammonia is good reducing agent, but has very strong stimulation
Property, is not easy to directly be used on automobile, and aqueous solution of urea is nontoxic, harmless, stable performance during storage, convenient transportation and does not have
Irritant smell, therefore generally use reducing agent of the aqueous solution of urea as vehicle-mounted SCR system.
Using SCR technology, then it is required to the exhaust pipe of engine for being ejected into automobile of aqueous solution of urea accurate quantification
In, and it is allowed to efficient and NOXEmission reacts in the presence of catalyst.Therefore being accomplished by offer atomising device makes urine
The plain aqueous solution is atomized in waste pipe.
Traditional air-assisted SCR technology being used current diesel motor exhaust after-treatment system more, not only need car
Carry compressed air come help spraying system carry out catalysis reduction work, and when spray end-of-job when, compressed air can be by system
Unnecessary aqueous solution of urea is blown in blast pipe in pipeline.Which is only applicable to the Medium or severe type vehicle equipped with air accumulator,
Cannot be used on light, medium sized vehicle without gas, both limit the application surface of SCR technology, also allow blast pipe water-soluble because of unnecessary urea
Liquid is piled up because of high temperature crystallization, and has the risk for blocking.
The content of the invention
The present invention provides a kind of pumping unit and a kind of for the urea liquid feed system of SCR system crystallization-preventive and side
Method, for solving the above problems.
To reach above-mentioned purpose, the invention provides a kind of pumping unit, for absorbing and spraying liquid, including：
One pumping check valve, is made up of check valve upper body and check valve lower body, and the check valve lower body is away from described unidirectional
One end of valve upper body is provided with the first inlet opening and the first fluid hole communicated with the external world, and the check valve upper body is away from the list
One end of valve lower body is provided with hydraulic structure；
Connection cavity is set between the check valve upper body and the check valve lower body, list is provided with the connection cavity
To valve film, the connection cavity is divided into left chamber body corresponding with first inlet opening and corresponding with first fluid hole
Right chamber body, the left chamber body and the right chamber body are mutually isolated, and enter by second between the left chamber body and the hydraulic structure
Fluid apertures is connected, and when the check valve diaphragm is contacted with the check valve upper body, be formed with makes first inlet opening between the two
The gap connected with second inlet opening, is connected, institute between the right chamber body and the hydraulic structure by the second fluid hole
When stating check valve diaphragm and being contacted with the check valve lower body, be formed with makes first fluid hole go out with described second between the two
The gap of fluid apertures connection.
Preferably, the hydraulic structure is made up of check valve upper body and pump diaphragm, the check valve upper body is away from institute
The one end for stating check valve lower body sets fluted, and the pump diaphragm is movably connected and is covered in described recessed with the check valve upper body
On groove, and moved up near and away from the side of the groove, second inlet opening and second fluid hole all with institute
State groove connection.
Preferably, the pump diaphragm is also associated with driver element, for drive pump diaphragm near and away from described recessed
The side of groove moves up.
Preferably, the driver element includes the connecting rod being connected with the pump diaphragm, the connecting rod is away from the pumping diaphragm
One end of piece through there is eccentric shaft mechanism, the direction run through perpendicular to the connecting rod length direction, the eccentric shaft mechanism from
It is outer to include rolling bearing, eccentric shaft and motor successively inwards.
Preferably, being connected by an abaculus between the connecting rod and the pump diaphragm, abaculus one end insertion is described
Pump diaphragm, the other end is embedded in the end of the connecting rod.
The present invention also provides a kind of urea liquid for SCR system crystallization-preventive and supplies solution system, including
One urea liquid feed unit, including pumping unit as described above and the commutation list of pumping unit connection
Temperature sensor, pressure sensor between unit, the setting reversing unit and the jet module；
One jet module, including the injection electromagnetic valve being connected with the urea liquid feed unit；
One control unit, is connected with engine, all connects with the urea liquid feed unit, jet module and engine
Connect, the data for receiving the engine, the temperature sensor and the pressure sensor, and controlled according to the data
The urea liquid feed unit, the injection electromagnetic valve.
Preferably, the reversing unit includes
One base, installed in the pumping unit bottom, is internally provided with four passages for mutually staggering, respectively first
Passage, second channel, third channel and fourth lane, the first passage and the second channel all with the pumping unit
First inlet opening is connected, and the third channel and the fourth lane are all connected with first fluid hole；
One inlet side two-bit triplet magnetic valve, including import and two outlets, two inlet side two-position three-way valves
Outlet passes through first inlet opening and first fluid hole of first passage and the third channel and the pumping unit respectively
Connection；
One goes out to hold two-bit triplet magnetic valve, described to go out to hold import and the institute of triple valve also including two outlets of an import
Injection electromagnetic valve connection is stated, goes out to hold the outlet of two-bit triplet magnetic valve to pass through second channel and the four-way respectively described in two
Road is connected with first inlet opening and first fluid hole of the pumping unit.
Preferably, the import of the inlet side two-bit triplet magnetic valve and urea liquid pipeline connection.
A kind of urea liquid using the urea liquid feed system for being used for SCR system crystallization-preventive as described above of the present invention
Supply method, comprises the following steps
After control unit receives the signal that urea liquid is provided the need for the engine sends, control unit control
The urea liquid feed unit absorbs urea liquid and is conveyed to the jet module, and the jet module sprays urea liquid；
After control unit receives the signal of the stopping offer urea liquid that the engine sends, control unit control
Reversing unit in the urea liquid feed unit so that the urea liquid flow direction in the urea liquid feed unit changes
Become, urea liquid feed unit suck-back urea liquid from the injection electromagnetic valve.
Compared with prior art, the beneficial effects of the invention are as follows：
The present invention provides a kind of pumping unit, and it is made up of check valve upper body and check valve lower body, the check valve lower body
One end away from the check valve upper body is provided with the first inlet opening and the first fluid hole that are communicated with the external world, on the check valve
Body is provided with hydraulic structure away from one end of the check valve lower body；
Connection cavity is set between the check valve upper body and the check valve lower body, list is provided with the connection cavity
To valve film, the connection cavity is divided into left chamber body corresponding with first inlet opening and corresponding with first fluid hole
Right chamber body, the left chamber body and the right chamber body are mutually isolated, and enter by second between the left chamber body and the hydraulic structure
Fluid apertures is connected, and when the check valve diaphragm is contacted with the check valve upper body, be formed with makes first inlet opening between the two
The gap connected with second inlet opening, is connected, institute between the right chamber body and the hydraulic structure by the second fluid hole
When stating check valve diaphragm and being contacted with the check valve lower body, be formed with makes first fluid hole go out with described second between the two
The gap of fluid apertures connection.Using this pumping unit, when feed liquor is needed, form negative pressure in hydraulic structure, check valve diaphragm with
Check valve upper body contact, the first inlet opening be suction urea liquid, urea liquid enter connection cavity in from check valve diaphragm with
During gap between check valve upper body enters the second inlet opening hence into hydraulic structure, when pumping unit sucks enough urea
After solution, malleation is formed in hydraulic structure, check valve diaphragm is contacted with check valve lower body, check valve diaphragm and check valve lower body it
Between form gap, the urea liquid in hydraulic structure carries out connection cavity by the second fluid hole, and by check valve diaphragm with
The gap formed between check valve lower body enters the first fluid hole, so as to discharge pumping unit.Therefore this pumping unit can
The preferably absorption of control urea liquid and discharge, will not cause the disposable excessive urea liquid more than needs injection of absorption,
Therefore the characteristics of there is precise control dosage.
In provided by the present invention for the urea liquid feed system and method for SCR system crystallization-preventive, due to pumping unit
In be provided with reversing unit, therefore when need to the exhaust pipe of engine in spray urea liquid when, do not use reversing unit will
The flow direction commutation of urea liquid in pipeline, can make pipeline that the urea liquid for absorbing in pipeline before is carried out into suck-back more, so as to keep away
Exempt to produce crystallization during unnecessary urea liquid remains in pipeline and jet module, reduced the risk of pipeline blockage.
Brief description of the drawings
The profile of the pumping unit that Fig. 1 is provided for the present invention；
Fig. 2 is the structural representation of the urea liquid feed system provided by the present invention for SCR system crystallization-preventive.
In figure：1- pumping units, 11- pumpings check valve, 111- check valves lower body, 1111- grooves, the feed liquors of 112- first
Hole, the fluid holes of 113- first, 114- connection cavity, the gaps of 1141- first, the gaps of 1142- second, 115- check valves diaphragm,
The inlet openings of 116- second, the fluid holes of 117- second, 118- check valves upper body, 119- pump diaphragms, 12- connecting rods, 13- abaculus, 14- rollings
Dynamic bearing, 15- eccentric shafts, 16- motors；
2- inlet sides two-bit triplets magnetic valve, 3- go out to hold two-bit triplet magnetic valve, 4- temperature sensors, 5- pressure sensors,
6- control units, 7- injection electromagnetic valves, 8- urea liquids pipeline, 9- engines；
The import of A1- inlet sides two-bit triplet magnetic valve, P1- inlet sides first outlet, T1- inlet sides second outlet, A2- go out end two
The import of position-3-way solenoid valve, P2- go out to hold first outlet, T2- to go out to hold second outlet.
Specific embodiment
To enable the above objects, features and advantages of the present invention more obvious understandable, below in conjunction with the accompanying drawings to the present invention
Specific embodiment be described in detail.
Fig. 1 is refer to, the invention provides a kind of pumping unit 1, for absorbing urea liquid, temporary transient stored urea solution
And urea liquid is discharged, include the pumping check valve 11 being connected with each other successively from bottom to up and for driving pumping check valve 11
The driver element of work.
Pumping check valve 11, is made up of check valve upper body 118 and check valve lower body 111, the check valve lower body 111 away from
One end of the check valve upper body 118 is provided with the first inlet opening 112 and the first fluid hole 113 communicated with the external world, the list
One end of the check valve lower body 111 is provided with hydraulic structure to valve upper body 118, hydraulic structure is and the first inlet opening
112 connect with the first fluid hole 113, and the urea liquid for so being absorbed from the first inlet opening 112 is temporarily stored within hydraulic structure
In, after storage is finished, then urea liquid is discharged from the first fluid hole 113.
Hydraulic structure is specially check valve upper body 118 and forms groove 1111, and pump diaphragm 119 is coated with groove 1111,
Pump diaphragm 119 is movably connected with check valve upper body 118, that is to say, that pump diaphragm 119 can be moved in groove 1111 so that groove
1111 volume changes, so that air pressure inside and hydraulic pressure change.Specifically, can be in 1111 mouthfuls of settings of groove
Snap fit, pump diaphragm 119 is fixed on snap fit lower section, and its edge is moved along the groove walls of groove 1111, but spacing due to snap fit,
It is only moved in groove 1111, it is impossible to be moved to outside groove 1111.
Between the check valve upper body 118 and the check valve lower body 111 set connection cavity 114, connection cavity 114 with
First inlet opening 112 is connected with the first fluid hole 113, and check valve diaphragm 115, the company are provided with the connection cavity 114
114 points of cavity body be left chamber body corresponding with first inlet opening 113 and with the corresponding right chamber of first fluid hole 113
Although body, the left chamber body connects with the right chamber body, but due to the presence of check valve diaphragm 115 so that two cavitys are mutual
It is isolated, connectivity structure is provided between connection cavity 114 and groove 1111, specially passes through between left chamber body and groove 1111
Second inlet opening 116 is connected, and is connected by the second fluid hole 117 between right chamber body and groove 1111, in left chamber body, check valve
The first gap 1141 is provided with upper body 118, in right chamber body, the second gap 1142 is provided with check valve lower body 111, unidirectionally
When valve film 115 is contacted with check valve upper body 118, the first gap 1141 cannot be blocked by unidirectional valve film 115, so connect chamber
Liquid in body 114 can only enter the second inlet opening 116, check valve diaphragm 115 and check valve lower body 111 from the first gap 1141
During contact, the second gap 1142 cannot be blocked by unidirectional valve film 115, and the liquid so connected in cavity 114 can only be from second
Gap 1142 enters the first fluid hole 113.
Driver element includes the connecting rod 12 being movably connected with pump diaphragm 119, using embedding between the connecting rod 12 and pump diaphragm 119
Block 13 is connected, and the two ends of abaculus 13 are respectively embedded into the end of connecting rod 12 and pump diaphragm 119, after abaculus 13 enters pump diaphragm 119
Width with the end of connecting rod 12 increases, and so as to snap in inside pump diaphragm 119 and connecting rod 12, abaculus 13 is kept stabilization, and connects
When pulling pump diaphragm 119 to move up and down, abaculus 13 plays certain cushioning effect to bar 12.
Connecting rod 12 is toroidal away from one end of pump diaphragm 119, through there is eccentric shaft structure in annulus, specifically from outer
Be inwardly rolling bearing 14, eccentric shaft 15 and motor 16, motor 16 drives eccentric shaft 15 to make spinning motion, eccentric shaft 15 from
Turn to form cam driving structure and rolling bearing 14 between, drive link 12 moves up and down during 14 rotation of rolling bearing.
The motion mode of pumping unit 1 is：When needing pumping unit 1 to absorb urea liquid, motor 16 drives eccentric shaft
15 are rotated so that connecting rod 12 is moved up, and pump diaphragm 119 is driven and moves up so that negative pressure is formed in groove 1111, unidirectionally
Valve film 115 is contacted by upward air-breathing in the presence of negative pressure with check valve upper body 118, work of first inlet opening 112 in negative pressure
With lower absorption urea liquid, urea liquid by the first gap 1141 after the entrance connection cavity 114 of the first inlet opening 112 by being entered
Enter the second inlet opening 116 so as to be temporarily stored in groove 1111；
When 1 emission of urea solution of pumping unit is needed, motor 16 drives eccentric shaft 15 to rotate so that connecting rod 12 is to moving down
Dynamic, pump diaphragm 119 is driven and moves down so that malleation is formed in groove 1111, and the urea liquid in groove 1111 is by the
Two fluid hole 117 enters connection cavity 114 so that check valve diaphragm 115 is close to downwards check valve lower body 111, and urea liquid leads to
Cross the second gap 1142 and enter the first fluid hole 113, so as to discharge pumping unit 1.
Fig. 1 is refer to, the present invention also provides a kind of urea liquid for SCR system crystallization-preventive and supplies solution system, bag
Include
One urea liquid feed unit, including the commutation that pumping unit as described above 1 and the pumping unit 1 are connected
Unit, the temperature sensor 4 being arranged between the reversing unit and the jet module, pressure sensor 5；
One jet module, including the injection electromagnetic valve 7 being connected with the urea liquid feed unit；
One control unit 6, and pumping unit 1, inlet side two-bit triplet magnetic valve 2 and goes out to hold two-bit triplet magnetic valve 3, injection
Module and engine 9 are all connected, for receiving the engine 9, the temperature sensor 4 and the pressure sensor 5
Data, and control the urea liquid feed unit, the injection electromagnetic valve 7 according to the data.Control unit 6 and engine
9 connections, can receive the signal whether engine 9 starts to start, to start to start, then after control unit 6 receives signal, and control
Urea liquid feed unit starts the program for absorbing urea liquid, starts absorption urea liquid and is transported to jet module, by
Injection electromagnetic valve 7 in jet module is to engine exhaust pipe inspection urea liquid；If the stop motion of engine 9, controls
After unit 6 receives signal, control urea liquid feed unit starts the program of suck-back urea liquid, starts suck-back injection electromagnetic valve
Urea liquid in 7 so that the urea liquid in injection electromagnetic valve 7 is reversely transported, by returning to urea liquid after pumping unit 1
In pipeline 8.
Control unit 6 is connected with the motor 16 in pumping unit 1, the speed for controlling it to move, so as to control eccentric shaft 15
Slewing rate, and then the frequency that controls connecting rod 12 is moved up and down.
Preferably, the reversing unit includes
One base (not shown), installed in the bottom of the pumping unit 1, is internally provided with four passages for mutually staggering,
Respectively first passage, second channel, third channel and fourth lane, the first passage and the second channel all with it is described
First inlet opening 112 of pumping unit 1 is connected, the third channel and the fourth lane all with first fluid hole 113
Connection；
One inlet side two-bit triplet magnetic valve 2, including an import and two outlets, respectively inlet side two-bit triplet magnetic valve
Import A1 and inlet side first outlet P1, wherein inlet side second outlet T1, the import A1 and urea of inlet side two-bit triplet magnetic valve
Solution line 8 is connected, and urea liquid pipeline 8 provides urea liquid, inlet side first to the import A1 of inlet side two-bit triplet magnetic valve
Outlet P1 is connected by first passage with the first inlet opening 112 of pumping unit 1, inlet side second outlet T1 by thirdly through with
First fluid hole 113 of pumping unit 1 is connected；When inlet side two-bit triplet magnetic valve 2 is in off-position, inlet side two-bit triplet
The import A1 of magnetic valve is communicated with inlet side first outlet P1, and inlet side second outlet T1 is in closed state；When inlet side two-bit triplet
When magnetic valve 2 is in "on" position, the import A1 of inlet side two-bit triplet magnetic valve is communicated with inlet side second outlet T1, inlet side second
Outlet P1 is in closed state.
One goes out to hold two-bit triplet magnetic valve 3, also including two outlets of an import, is respectively out end two-bit triplet magnetic valve
Import A2, go out to hold first outlet P2, go out to hold second outlet T2, wherein going out to hold the import A2 of two-bit triplet magnetic valve and the spray
Radio magnet valve 7 is connected, and goes out to hold first outlet P2 to be connected with the first fluid hole 112 of pumping unit 1 by second channel, goes out end
Two outlet T2 are connected by fourth lane with the first inlet opening 113 of pumping unit 1；It is in when going out to hold two-bit triplet magnetic valve 3
During off-position, go out to hold the import A2 of two-bit triplet magnetic valve to be communicated with going out to hold first outlet P2, go out to hold second outlet T2 to be in
Closed state；When going out to hold two-bit triplet magnetic valve 3 to be in "on" position, go out to hold the import A2 of two-bit triplet magnetic valve and go out end
Second outlet T2 is communicated, and goes out to hold first outlet P2 to be in closed state.
Temperature sensor 4 and pressure sensor 5 are arranged on out the import A2 and injection electromagnetic valve 7 of end two-bit triplet magnetic valve
On the pipeline of connection.Inlet side two-bit triplet magnetic valve 2, go out to hold two-bit triplet magnetic valve 3, pumping unit 1, temperature sensor 4 with
And pressure sensor 5 is all connected with the signal of control unit 6, control unit 6 can control inlet side two-bit triplet magnetic valve 2 power-off and
"on" position.
The present invention provides a kind of urea using the urea liquid feed system for being used for SCR system crystallization-preventive as described above
Solution supply method, comprises the following steps：
After control unit 6 receives the enabling signal that engine 9 sends, the control of control unit 6 makes inlet side two-bit triplet
Magnetic valve 2 and go out to hold two-bit triplet magnetic valve 3 to be in off-position, now inlet side two three in inlet side two-bit triplet magnetic valve 2
The import A1 of three-way electromagnetic valve is communicated with inlet side first outlet P1, and inlet side second outlet T1 is in closed state, urea liquid pipeline 8
In urea liquid pass sequentially through the import A1 of inlet side two-bit triplet magnetic valve, inlet side first outlet P1 and lead to by the first of base
Road enters the first inlet opening 112 of pumping unit 1, by after the temporary transient storage of the groove 1111 in pumping unit 1, being discharged the
One fluid hole 113, now goes out to hold the import A2 for going out to hold two-bit triplet magnetic valve in two-bit triplet magnetic valve 3 to go out with end first is gone out
Mouth P2 connections, go out to hold second outlet T2 to be in closed state, and the urea liquid for being discharged the first fluid hole 113 passes sequentially through out end
First outlet P2 and go out to hold the import A2 of two-bit triplet magnetic valve to enter in injection electromagnetic valve 7, so as to in the exhaust pipe of engine
Injection.In the process, temperature sensor 4 and pressure sensor 5 are used to detect the urea liquid to the conveying of injection electromagnetic valve 7
Temperature and pressure, so as to control the movement rate of motor 16 in pumping unit 1.
When control unit 6 receive that engine 9 sends shut down signal after, the control of control unit 6 makes inlet side two
Three-way magnetic valve 2 and go out to hold two-bit triplet magnetic valve 3 to be in "on" position, now go out to hold in two-bit triplet magnetic valve 3 and go out end
The import A2 of two-bit triplet magnetic valve is connected with going out to hold second outlet T2, goes out to hold second outlet P2 to be in closed state, is now sprayed
Urea liquid in radio magnet valve 7 passes sequentially through out the import A2 of end two-bit triplet magnetic valve, goes out to hold second outlet T2 to enter pump
The first inlet opening 112 of unit 1 is inhaled, by after the temporary transient storage of the groove 1111 in pumping unit 1, from the first fluid hole 113
Discharge, now the import A1 of inlet side two-bit triplet magnetic valve is communicated with inlet side second outlet T1 in inlet side two-bit triplet magnetic valve 2,
Inlet side first outlet P1 is in closed state, and inlet side second outlet is passed sequentially through from the urea liquid of the discharge of the first fluid hole 113
T1, the import A1 of inlet side two-bit triplet magnetic valve are hence into urea liquid pipeline 8 so that the urea in injection electromagnetic valve 7
Solution suck-back is returned in urea liquid pipeline 8, prevents urea liquid from remaining in and crystallization is produced in injection electromagnetic valve 7, reduce pipeline with
And the risk that injection oral area is blocked.
In sum, the pumping unit 1 that the present invention is provided can preferably control the absorption and discharge of urea liquid, will not
Cause it is disposable absorb the excessive urea liquid sprayed more than needs, therefore the characteristics of with precise control dosage.
In provided by the present invention for the urea liquid feed system and method for SCR system crystallization-preventive, due to pumping unit 1
In be provided with reversing unit, therefore when in no longer needing to the exhaust pipe of engine spray urea liquid when, use reversing unit will
The flow direction commutation of urea liquid in pipeline, can carry out suck-back more by the urea liquid for absorbing in pipeline before, many so as to avoid
Remaining urea liquid produces crystallization in remaining in pipeline and jet module, reduces the risk of pipeline blockage.
Obviously, those skilled in the art can carry out various changes and modification without deviating from spirit of the invention to invention
And scope.If these modifications of the invention and modification belong within the scope of the claims in the present invention and its equivalent technologies, this
Invention is also intended to including including these changes and modification.
Claims (9)
1. a kind of pumping unit, for absorbing and spraying liquid, it is characterised in that including：
One pumping check valve, is made up of check valve upper body and check valve lower body, and the check valve lower body is away from the check valve
One end of body is provided with the first inlet opening and the first fluid hole communicated with the external world, and the check valve upper body is away from the check valve
One end of lower body is provided with hydraulic structure；
Connection cavity is set between the check valve upper body and the check valve lower body, check valve is provided with the connection cavity
Diaphragm, the connection cavity is divided into left chamber body corresponding with first inlet opening and right chamber corresponding with first fluid hole
Body, the left chamber body and the right chamber body are mutually isolated, and the second inlet opening is passed through between the left chamber body and the hydraulic structure
Connection, when the check valve diaphragm is contacted with the check valve upper body, be formed with makes first inlet opening and institute between the two
The gap of the second inlet opening connection is stated, is connected by the second fluid hole between the right chamber body and the hydraulic structure, the list
When being contacted with the check valve lower body to valve film, be formed with makes first fluid hole with second fluid hole between the two
The gap of connection.
2. pumping unit as claimed in claim 1, it is characterised in that the hydraulic structure is by check valve upper body and pump diaphragm structure
Set fluted in the one end away from the check valve lower body into, the check valve upper body, the pump diaphragm and the check valve
Upper body movably connects and is covered on the groove, and is moved up in the side near and away from the groove, and described second enters
Fluid apertures and second fluid hole are all connected with the groove.
3. pumping unit as claimed in claim 2, it is characterised in that the pump diaphragm is also associated with driver element, for driving
Dynamic pump diaphragm is moved up in the side near and away from the groove.
4. pumping unit as claimed in claim 3, it is characterised in that the driver element includes what is be connected with the pump diaphragm
Connecting rod, the connecting rod runs through away from one end of the pump diaphragm eccentric shaft mechanism, and the direction run through is perpendicular to the connecting rod
Length direction, the eccentric shaft mechanism includes rolling bearing, eccentric shaft and motor successively outside in.
5. pumping unit as claimed in claim 4, it is characterised in that pass through an abaculus between the connecting rod and the pump diaphragm
Connection, described abaculus one end is embedded in the pump diaphragm, and the other end is embedded in the end of the connecting rod.
6. a kind of urea liquid for SCR system crystallization-preventive supplies solution system, it is characterised in that including
One urea liquid feed unit, including pumping unit and the pumping as described in any one in Claims 1 to 5
The reversing unit of unit connection, temperature sensor, the pressure sensing being arranged between the reversing unit and the jet module
Device；
One jet module, including the injection electromagnetic valve being connected with the urea liquid feed unit；
One control unit, is all connected, with the urea liquid feed unit, jet module and engine for receiving the hair
The data of motivation, the temperature sensor and the pressure sensor, and control the urea liquid supply according to the data
Unit, the injection electromagnetic valve.
7. the urea liquid feed system of SCR system crystallization-preventive is used for as claimed in claim 6, it is characterised in that described to change
Include to unit
One base, installed in the pumping unit bottom, is internally provided with four passages for mutually staggering, and respectively first leads to
Road, second channel, third channel and fourth lane, the first passage and the second channel are all with the of the pumping unit
One inlet opening is connected, and the third channel and the fourth lane are all connected with first fluid hole；
One inlet side two-bit triplet magnetic valve, including an import and two outlets, two outlets of the inlet side two-position three-way valve
Connected with first inlet opening and first fluid hole of the pumping unit by first passage and the third channel respectively；
One goes out to hold two-bit triplet magnetic valve, described to go out to hold the import and the spray of triple valve also including two outlets of an import
Radio magnet valve is connected, go out to hold described in two the outlet of two-bit triplet magnetic valve respectively by second channel and the fourth lane with
First inlet opening of the pumping unit is connected with first fluid hole.
8. the as claimed in claim 7 urea liquid feed system for being used for SCR system crystallization-preventive, it is characterised in that it is described enter
Hold import and the urea liquid pipeline connection of two-bit triplet magnetic valve.
9. a kind of urea liquid of urea liquid feed system for SCR system crystallization-preventive using as described in right wants 6 is supplied
To method, it is characterised in that comprise the following steps：
After control unit receives the signal that urea liquid is provided the need for the engine sends, control unit control is described
Urea liquid feed unit absorbs urea liquid and is conveyed to the jet module, and the jet module sprays urea liquid；
After control unit receives the signal of the stopping offer urea liquid that the engine sends, control unit control is described
Reversing unit in urea liquid feed unit so that the urea liquid flow direction in the urea liquid feed unit changes, institute
State urea liquid feed unit suck-back urea liquid from the injection electromagnetic valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710038041.3A CN106762048A (en) | 2017-01-18 | 2017-01-18 | Pumping unit and the urea liquid feed system and method for SCR system crystallization-preventive |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710038041.3A CN106762048A (en) | 2017-01-18 | 2017-01-18 | Pumping unit and the urea liquid feed system and method for SCR system crystallization-preventive |
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| CN109268112A (en) * | 2018-09-18 | 2019-01-25 | 浙江锦佳汽车零部件有限公司 | High adaptive on-demand feed flow urea pump assembly |
| CN109386352A (en) * | 2017-08-09 | 2019-02-26 | 博世汽车柴油系统有限公司 | Supplying module and tail-gas after treatment apparatus for exhaust aftertreatment |
| CN112943419A (en) * | 2021-03-09 | 2021-06-11 | 广西卡迪亚科技有限公司 | Anti-crystallization control method for diesel engine SCR tail gas after-treatment system |
| CN113606018A (en) * | 2021-08-05 | 2021-11-05 | 宁波楷世环保科技有限公司 | Urea solution back-pumping control device and fault diagnosis method thereof |
| CN109386352B (en) * | 2017-08-09 | 2024-05-03 | 博世动力总成有限公司 | Supply module for exhaust gas aftertreatment and exhaust gas aftertreatment device |
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Application publication date: 20170531 |