CN109386352A - Supplying module and tail-gas after treatment apparatus for exhaust aftertreatment - Google Patents
Supplying module and tail-gas after treatment apparatus for exhaust aftertreatment Download PDFInfo
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- CN109386352A CN109386352A CN201710675298.XA CN201710675298A CN109386352A CN 109386352 A CN109386352 A CN 109386352A CN 201710675298 A CN201710675298 A CN 201710675298A CN 109386352 A CN109386352 A CN 109386352A
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- valve
- supplying module
- pressure
- exhaust aftertreatment
- pump
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- 238000012546 transfer Methods 0.000 claims abstract description 67
- 230000008859 change Effects 0.000 claims abstract description 7
- 238000005086 pumping Methods 0.000 claims description 7
- 230000005484 gravity Effects 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 description 37
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 10
- 239000007864 aqueous solution Substances 0.000 description 10
- 239000004202 carbamide Substances 0.000 description 10
- 230000007423 decrease Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- 238000010009 beating Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- -1 however Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
Classifications
-
- 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
- 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
- F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1433—Pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
This application involves a kind of supplying module for exhaust aftertreatment, the supplying module includes: pump, and the pump is configured to convey exhaust aftertreatment agent between suction pipeline and pressure piping；Reversing valve, the reversing valve are configured to make the exhaust aftertreatment agent flow to the normal operating phase of the pressure piping from the suction pipeline and switching the exhaust aftertreatment agent between the empty stage that the pressure piping flows to the suction pipeline；Transfer valve, the transfer valve are used to make to suck the pump or unidirectionally pass through from the exhaust aftertreatment agent of the pump discharge；Wherein, the transfer valve is configured to open in the case where opening pressure, and the opening pressure is that the temperature change being subjected to after empty stage based on the supplying module is obtained.The application further relates to a kind of tail-gas after treatment apparatus including above-mentioned supplying module.According to the application, the risk of supplying module damage can be eliminated, and simple and reliable for structure.
Description
Technical field
This application involves the exhaust aftertreatment field of engine more particularly to a kind of supplying modules for exhaust aftertreatment
With the tail-gas after treatment apparatus including the supplying module.
Background technique
In order to reduce pollution of the motor exhaust to air, tail-gas after treatment apparatus is widely used, tail gas is carried out further
Processing.Existing tail-gas after treatment apparatus is usually to pass through supplying module when system detection is exceeded to tail gas for exhaust aftertreatment
Agent (for example, aqueous solution of urea) is transported to jet module, is then sprayed exhaust aftertreatment agent to offgas duct by jet module, made
Catalytic reduction reaction occurs in offgas duct for itself and tail gas, to reduce the pernicious gas content in tail gas.For this purpose, vent gas treatment
Device generally comprises exhaust aftertreatment agent storage tank, suction pipeline, supplying module, pressure piping and jet module.Supplying module will
Vent gas treatment agent is sucked out through suction pipeline from storage tank, and is delivered to jet module through pressure piping.In addition, in order to adjust pressure pipe
Pressure in road simultaneously makes extra exhaust aftertreatment agent return to storage tank, is typically provided the return pipe for leading to storage tank from supplying module
Road.In this way, flowing to pressure piping all the way from the fluid that supplying module is discharged, another way flows to return line.
Common exhaust aftertreatment agent is aqueous solution of urea, however, aqueous solution of urea will become ice and volume at low temperature
Expansion, is easily damaged tail-gas after treatment apparatus.So needing to control supplying module keeps it reversed when needing to close engine
Operation, to draw back in storage tank the residual urea aqueous solution in pressure piping from jet module, pressure piping and supplying module.
However, internal duct will be isolated with external environment without air exchange after whole system is closed.With inside and outside temperature
The decline of degree, compared with external pressure, decline is generated negative pressure by air pressure in system.The negative pressure will lead to aqueous solution of urea warp
Suction pipeline is refilled with supplying module.Therefore, at low ambient temperatures, this phenomenon can damage supplying module etc..
To solve this problem, two schemes are disclosed at present.A kind of scheme is to remove the check valve in return line,
So that the pressure in system is always balanced with external pressure.It thus would be desirable to even if at low ambient temperatures, will not occur to fill out again
The phenomenon that filling.However, the shortcomings that this scheme, is: when the length of return line is shorter compared with pressure piping, be not enough to by
Pressure piping is emptied completely.Another scheme is to increase the valve for being used to open or closing suction pipeline in suction pipeline.
When it is shut off, which is also switched off, to prevent from being refilled with supplying module.However, the shortcomings that this scheme, is: working as use
When electronic mode controls, control system is increasingly complex；When using manual mode control, user be easy to forget to close valve and still
In the presence of the risk of damage supplying module.
Therefore, it is necessary to a kind of simple, reliable supplying module and tail-gas after treatment apparatus.
Summary of the invention
The purpose of the application seeks to overcome the problems, such as at least one present in existing tail-gas after treatment apparatus, proposes one kind
Improved supplying module and tail-gas after treatment apparatus including this supplying module supply to be eliminated with simple, reliable way
It is risk of damage to module.
For this purpose, providing a kind of supplying module for exhaust aftertreatment, the supply mould according to the one side of the application
Block includes:
Pump, the pump are configured to convey exhaust aftertreatment agent between suction pipeline and pressure piping；
Reversing valve, the reversing valve are configured to that the exhaust aftertreatment agent is made to flow to the pressure from the suction pipeline
The normal operating phase on solenoid road and the emptying for making the exhaust aftertreatment agent flow to the suction pipeline from the pressure piping
Switch between stage；
Transfer valve, the transfer valve are used to make to suck the pump or unidirectional from the exhaust aftertreatment agent of the pump discharge
Pass through；
Wherein, the transfer valve is configured to open in the case where opening pressure, and the opening pressure is based on the supply mould
What the temperature change that block is subjected to after empty stage obtained.
According to the another aspect of the application, a kind of tail-gas after treatment apparatus is provided, comprising:
For storing the storage tank of exhaust aftertreatment agent；
Jet module, the jet module is for ejecting the exhaust aftertreatment agent；
Supplying module as described above, the supplying module is for the exhaust aftertreatment agent to be supplied to from the storage tank
The jet module；
Suction pipeline, the suction pipeline are connected between the storage tank and the supplying module；With
Pressure piping, the pressure piping are connected between the supplying module and the jet module.
Compared with prior art, it is provided at transfer valve of the application in supplying module and opens pressure, so that transfer valve
It could only open under pressure.In this way, after empty stage, when being in transfer valve downstream in normal operating phase
When the air in enclosed volume that pipeline or component are formed is shunk as temperature declines, if air shrinks the pressure generated not
It is enough to open transfer valve, then does not will lead to exhaust aftertreatment agent along suction pipeline and enter supplying module.Therefore, confession is eliminated
To the risk of module damage.The structure of the application is simple, does not need the structure for largely changing existing supplying module.
Detailed description of the invention
The exemplary embodiment of the application is described in detail with reference to the accompanying drawing and the application is explained further.In the accompanying drawings:
Fig. 1 is the functional block diagram according to the tail-gas after treatment apparatus of one embodiment of the application；
Fig. 2 is an exemplary show in schematic partial sections of supplying module shown in FIG. 1.
Specific embodiment
Preferred embodiment of the present application is described in detail below with reference to example.In a preferred embodiment of the present application, to include
The application is described for the supplying module of diaphragm pump.But it will be understood by those skilled in the art that these are exemplary
Embodiment is not meant to form any restrictions to the application.In addition, in the absence of conflict, embodiments herein and reality
The feature applied in example can be combined with each other.In the accompanying drawings, for simplicity, other components are omitted, but this does not indicate this
The supplying module and tail-gas after treatment apparatus of application not may include other components.
Fig. 1 is the functional block diagram according to the tail-gas after treatment apparatus of one embodiment of the application.As shown in Figure 1, except supply mould
Except 20 difference of block, other components of the tail-gas after treatment apparatus of the application are conventional configurations.Tail-gas after treatment apparatus includes
For storing the storage tank 10 of exhaust aftertreatment agent, the jet module 40 for spraying exhaust aftertreatment agent, for will be after tail gas
Reason agent is delivered to the supplying module 20 of jet module 40 from storage tank 10.Correspondingly, tail-gas after treatment apparatus further includes suction pipeline
70 and pressure piping 30, wherein suction pipeline 70 is connected between storage tank 10 and supplying module 20, and pressure piping 30 is connected to confession
To between module 20 and jet module 40.
In addition, in the embodiment shown in fig. 1, tail-gas after treatment apparatus further includes return line 60.Return line 60
It connects between supplying module 20 and storage tank 10, the exhaust aftertreatment agent being discharged from supplying module 20 can be returned to storage tank 10.
In return line 60, it is additionally provided with backflow fittings 50 comprising throttle valve and check valve are stablized with the pressure in control system.
Supplying module 20 is further described referring to Fig. 1.Dotted portion as shown in Figure 1, supplying module 20 include pump
23, reversing valve 21, inlet valve 22 and transfer valve 24.Pump 23 is configured to convey tail between suction pipeline 70 and pressure piping 30
Gas post-treatment agent.Reversing valve 21 is configured in the normal fortune for making exhaust aftertreatment agent flow to from suction pipeline 70 pressure piping 30
Row order section and switch exhaust aftertreatment agent between the empty stage that pressure piping 30 flows to suction pipeline 70.In an embodiment
In, reversing valve 21 includes spring force position and electromagnetic force position.When reversing valve 21 is in spring force position, after tail gas capable of being made
Inorganic agent flows into pump 23 from suction pipeline 70, and from feed pressure pipeline 30 after the discharge of pump 23, thus after realizing normal tail gas
Processing operation, i.e. normal operating phase.When reversing valve 21 is in electromagnetic force position, i.e. empty stage, after tail gas capable of being made
It manages agent and flows into pump 23 from pressure piping 30, and flow into suction pipeline 70 after the discharge of pump 23, to realize tail-gas after treatment apparatus
Emptying operation.Because reversing valve 21 is the common components in existing supplying module, no longer it is described in further detail herein.It inhales
Entering valve 22 and transfer valve 24 is all check valve, for making to flow into pump 22 or unidirectionally pass through from the exhaust aftertreatment agent that pump 22 is discharged.
In addition, supplying module 20 is also generally included in just to be filtered before exhaust aftertreatment agent enters jet module 40 to it
The normal operation phase is in the filter (not shown) in 24 downstream of transfer valve.The filter is connected with pressure piping 30.Institute as above
State, normal operating phase be in 24 downstream of transfer valve component and pipeline include pressure piping 30 and supplying module 20 filtering
Device.In addition, also being wrapped in another embodiment for including return line in the pipeline that normal operating phase is in 24 downstream of transfer valve
Include return line 60.Certainly, according to different applications, it may also be arranged on normal operating phase and be in the other of 24 downstream of transfer valve
Component or pipeline.
Structure described above and the structure of conventional supplying module are essentially identical.For the purpose for simplifying description, below
In the pipe in 24 downstream of transfer valve is only in normal operating phase to represent with the filter of pressure piping 30 and supplying module 20
Road and component, wherein not including return line 60 and other pipelines and/or component.However, the principles described herein is equally applicable
In the other embodiments including return line 60 and other pipelines and/or component.
In general, in conventional supplying module (describing referring to Fig.1, but transfer valve 24 is different), in the system down periods,
I.e. after empty stage, injection valve is closed in jet module 40, and transfer valve 24 is closed, so that in pressure piping 30 and supply mould
Closed volume is formed in the filter of block 20.When the air in the filter of pressure piping 30 and supplying module 20 is with temperature
When declining and shrinking, will appear negative pressure in pressure piping 30 and supplying module 20, thus pressure piping 30 and storage tank 10 it
Between form pressure difference, cause inlet valve 22 and transfer valve 24 to open.It will appear exhaust aftertreatment agent in this way and pass through suction pipeline 70
The phenomenon that being refilled with supplying module 20.If suction pipeline 70 is too short, the exhaust aftertreatment agent refilled can be full of pumping
Suction pipe road 70 simultaneously enters in supplying module 20, for example, the region of reversing valve 21.With the decline of environment temperature, after tail gas
When managing the temperature of agent lower than its freezing point temperature, exhaust aftertreatment agent will be expanded because of icing, to damage supplying module 20.Logical
Normal Vehicular exhaust after-treatment system pipeline arrangement in, pressure piping 30 generally can it is longer than suction pipeline 70 very much, and supply
The volume of the filter of module 20 is larger, therefore the sum of volume in pressure piping 30 and the volume of filter of supplying module 20
Much larger than the volume of suction pipeline 70.The negative pressure generated in the filter of pressure piping 30 and supplying module 20 is that occur filling out again
Fill the major influence factors of phenomenon.Certainly, there is also suction pipelines 70 in Some vehicles exhaust gas aftertreatment system pipeline arrangement
Longer situation, even if being then refilled with phenomenon at this time, the exhaust aftertreatment agent being refilled with also is merely resting on suction
In pipeline 70, without being packed into supplying module 20.Therefore, if only considering that the air in suction pipeline 70 is shunk, no matter
Length, which will not result in, there is the phenomenon that being refilled with supplying module.
It is worth noting that, the supplying module of the application is the difference is that the structure of transfer valve 24 is different.Transfer valve
24 are configured to open in the case where opening pressure p.That is, transfer valve 24 is set to by the pressure for being more than opening pressure p
It is just opened when power.In this way, even if the air in low temperature environment in the filter of pressure piping 30 and supplying module 20 is shunk, institute
The negative pressure of generation is also insufficient to allow transfer valve 24 to open, thus by pressure piping 30 and the filter and suction tube of supplying module 20
Road 70 separates.This avoid suction function of the exhaust aftertreatment agent in the filter of pressure piping 30 and supplying module 20
Under the problem of being refilled with supplying module 20.
To realize the filter and suction pipeline 70 that separate pressure piping 30 and supplying module 20 well, transfer valve 24
It opens pressure p and has to pass through stringent calculating.As described above, after empty stage, in pressure piping 30 and supplying module 20
Filter in form closed volume, internal air is shunk with the temperature change that supplying module 20 is subjected to, by
This negative pressure generated is that occur being refilled with the principal element of phenomenon.For the filter in pressure piping 30 and supplying module 20
For interior air, under the premise of not being refilled with phenomenon, volume is fixed.Therefore, the supplying module of the application
The opening pressure p of transfer valve 24 in 20 is obtained based on the temperature change that supplying module 20 is subjected to after empty stage
's.
A kind of illustrative methods that the opening pressure p of transfer valve 24 is obtained by way of calculating are given below.Many institute's weeks
Know, for a certain amount of gas, can use existing The Ideal-Gas Equation (alternatively, Charles' law) to calculate it
Temperature and pressure:
P*V=n*R*T
Wherein: P is the pressure of gas, and V is the volume of gas, and n is the amount of the substance of gas, and R is constant (R=8.314),
T is the temperature of gas.
After executing emptying operation (that is, empty stage), enter in the filter of pressure piping 30 and supplying module 20
Gas, the pressure of entered gas are external atmosphere pressure P (for example, 101KPa), and temperature is the Current Temperatures (example of supplying module 20
Such as, 40 DEG C), and the amount n of volume V and substance is fixed value.So equation (1) can be obtained:
101*V=n*R* (40+273) (1)
With the decline of environment temperature, for example, the temperature of supplying module 20 drops to -15 DEG C, then equation (2) can be obtained:
P*V=nR* (- 15+273) (2)
By basic mathematic(al) manipulation, can be obtained at -15 DEG C in the filter of pressure piping 30 and supplying module 20
Pressure is about P=83.3KPa.Because the storage tank of exhaust aftertreatment agent is connected to ambient atmosphere, the pressure that transfer valve 24 is subject to
Strong poor Δ P is about 17.7KPa.So far, according to the compression area S of transfer valve 24 (for example, 100mm2), transfer valve can be calculated
Pressure F suffered by 24 (F=Δ P*S, for example, 1.77N).Opening pressure p by setting transfer valve 24 is greater than calculated
Pressure F can ensure that transfer valve 24 is just opened when by being more than to open the pressure of pressure p.
Being given above is only illustrative calculation method, and the difference of valve arrangement is arranged and conveyed according to pipeline, can be with
There are other calculation methods.Pressure p is opened required for transfer valve 24 alternatively, it is also possible to directly measure by way of test.
But no matter which kind of method is used, for above-described embodiment, the opening pressure p of transfer valve 24 is all based on supplying module 20 and exists
What the temperature change being subjected to after empty stage obtained.
Referring to Fig. 2 detailed description according to the supplying module of the embodiment of the application comprising diaphragm pump.Such as Fig. 2
Shown, pump 23 is diaphragm pump, and upper part structure includes connecting rod 231, bearing 232 and eccentric wheel 233.Eccentric wheel 233 is fixedly
It installs to the drive shaft 234 of motor, and is installed in rotation in the bore of connecting rod 231 by bearing 232.When the drive of motor
When moving axis 234 rotates, the internal part of eccentric wheel 233 and bearing 232 can correspondingly rotate.Because of the eccentric structure of eccentric wheel 233
It makes, so will lead to the external component of bearing 232 and connecting rod 231 moves in a certain angle.Pump 23 substructure include
Pump diaphragm 235, pumping diaphragm plate rack 237 and pump supporting element 236, pump diaphragm 235 pass through pumping diaphragm plate rack 237 and pump at its periphery
Supporting element 236 is fixed, and is attached to connecting rod 231 at its center and with the movement of connecting rod 231 and along the vertical direction
Movement.In this way, forming pump chambers 238 between pump diaphragm 235 and pumping diaphragm plate rack 237.After the machine has started, pump diaphragm
235 can it is vertically moving with the movement of connecting rod 231, thus make pump chambers 238 pump diaphragm 235 along the vertical direction
Expansion is once in a cycle of movement and compression is primary.
Pumping diaphragm plate rack 236 is connected in its other side and inlet valve 22 and transfer valve 24.As shown in Fig. 2, inlet valve 22
The entrance side of pump 23 is set, and the outlet side of pump 23 is arranged in transfer valve 24.Inlet valve 22 includes sucking valve film 221, sucking
Valve inlet 222 and sucking valve outlet 223, sucking valve film 221 are fixed at sucking valve outlet 223.Transfer valve 24 includes conveying
Valve film 241, conveying valve inlet 243 and conveying valve outlet 242, conveying valve film 241 are fixed at conveying valve inlet 243.It inhales
Enter valve 22 and transfer valve 24 is arranged in same housing 230, certainly, inlet valve 22 and transfer valve 24 can also respectively include individually
Shell.In addition, transfer valve 24 further includes opening pressure setting device 240, it is positioned adjacent to the position of conveying valve film 241.
In the expansion stage of pump chambers 238, valve film 221 is sucked under pressure and is deformed, so that the suction channel of inlet valve 22 is beaten
It opens, while remains turned-off conveying valve film 241.In this way, exhaust aftertreatment agent is flowed into from sucking valve inlet 222, and through sucking
Valve film 221 flows into pump chambers 238 from sucking valve outlet 223.Referring again to Fig. 2, in the compression stage of pump chambers 238, pump chamber
Exhaust aftertreatment agent in room 238 forces sucking valve film 221 to be closed, and the opening pressure p of transfer valve 24 is overcome to make transfer valve
Diaphragm 241 is opened, so that exhaust aftertreatment agent be made to flow into from conveying valve inlet 243, and is gone out through conveying valve film 241 from transfer valve
242 feed pressure pipelines 30 of mouth.
In the embodiment shown in Figure 2, sucking valve film 221 and conveying valve film 241 can be integrated into a monomer film
Piece, it is of course also possible to be individual diaphragm.During pump 23 operates, it is only necessary to ensure the expansion stage in pump chambers 238, only
Inlet valve 22 is opened and transfer valve 24 is closed, and in the compression stage of pump chambers 238, only transfer valve 24 is opened and inlet valve 22
Closing, and the specific flow passage structure of inlet valve 22 and transfer valve 24 is not particularly limited.
In an illustrated embodiment, open pressure setting device 240 be spring, set by be elastic force.Certainly, it opens
Pressure setting device 240 is also possible to other structures, such as provides gravity, magnetic force etc. as the device for opening pressure.In addition, beating
Open pressure setting device 240 be it is adjustable, the opening pressure p of transfer valve 24 can be adjusted according to demand.
In embodiments herein, provide be include the supplying module of diaphragm pump, but tail-gas after treatment apparatus can also
Using other pumping installations, such as plunger pump, gear pump etc..Correspondingly, according to different pump configurations, can only be arranged defeated
Valve 24 is sent, and is not provided with inlet valve 22.In these cases, the entrance side or outlet side in pump can be set in transfer valve 24.
In embodiments herein, exhaust aftertreatment agent is aqueous solution of urea, however is also possible to other and tail gas
The catalytic reducer or arbitrary substance to react.
The supplying module and tail-gas after treatment apparatus for exhaust aftertreatment of the application is described referring to Fig. 1 and 2
Operational process.
When onboard system detect vehicle tail gas it is exceeded when, it is necessary to start tail-gas after treatment apparatus.That is, wanting
Aqueous solution of urea is sprayed into offgas duct by tail-gas after treatment apparatus, so that aqueous solution of urea reacts with tail gas.
When tail-gas after treatment apparatus operates normally, the reversing valve 21 of supplying module 20 is in elastic force position.Urea is water-soluble
Liquid enters pump chambers 238 from storage tank 10 through suction pipeline 70, reversing valve 21, inlet valve 22 under the suction force effect of pump 23, and
It is discharged from transfer valve 24, feed pressure pipeline 30, and flows into jet module 40 in turn.
When onboard system detects that engine has been switched off or for example needs to close exhaust aftertreatment because others report an error
When device, system control reversing valve 21 is in electromagnetic force position, and the injection valve in jet module 40 is opened, and pumps 23 operations.Urine
Plain aqueous solution flows back to storage tank 10 from jet module 40, pressure piping 30 and supplying module 20 under the swabbing action of pump 23, makes whole
A system evacuation, is then shut off tail-gas after treatment apparatus.
When whole system is closed, in addition to storage tank 10, tail-gas after treatment apparatus is isolated with external environment, is handed over without air
It changes.With the decline of temperature, compared with the air pressure of external environment, internal air pressure decline.Cause in this way in pressure pipe
Negative pressure is generated in road 30, supplying module 20 and suction pipeline 70, and may cause and occur being refilled with phenomenon.Because of pressure piping
30 and supplying module 20 filter it is bigger than 70 volume of suction pipeline, so in the filter of pressure piping 30 and supplying module 20
Negative pressure can occur being refilled with the major influence factors of phenomenon.However, because the transfer valve 24 of the application is configured to
It is just opened when opening pressure p, so the negative pressure in the filter of pressure piping 30 and supplying module 20 generates on transfer valve 24
Power must be over and open pressure p and can just be applied to aqueous solution of urea in storage tank 10.Therefore, beating by setting transfer valve 24
Open pressure p, it can be ensured that the negative pressure in the filter of pressure piping 30 and supplying module 20 is insufficient to allow transfer valve 24 to open, from
And it avoids being refilled with phenomenon.
According to an embodiment of the present application, pressure is opened by the transfer valve setting to supplying module, so that exhaust aftertreatment
Negative pressure in the pipeline of device is insufficient to allow transfer valve to open, so that exhaust aftertreatment agent will not be caused to enter along suction pipeline
Supplying module.Therefore, the generation for being refilled with phenomenon is avoided, while eliminating the risk of supplying module damage.The application's
Structure is simple, it is only necessary to change the structure of transfer valve, or addition transfer valve described herein in existing supplying module.
The application is described in detail in conjunction with specific embodiments above.Obviously, above description and show in the accompanying drawings
Embodiment out should be construed as illustratively, without constituting the limitation to the application.For example, in a preferred embodiment with
The application is described for supplying module and tail-gas after treatment apparatus for motor exhaust post-processing, still, no
Only in engine art, in the field that any need post-processes tail gas, all available applications.For those skilled in the art
For member, various variations or modifications can be carried out to it in the case where not departing from spirit herein, these variations or modifications
All without departing from scope of the present application.
Claims (10)
1. a kind of supplying module (20) for exhaust aftertreatment, the supplying module include:
It pumps (22), the pump is configured to convey exhaust aftertreatment agent between suction pipeline (70) and pressure piping (30)；
Reversing valve (21), the reversing valve are configured to that the exhaust aftertreatment agent is made to flow to institute from the suction pipeline (70)
It states the normal operating phase of pressure piping (30) and the exhaust aftertreatment agent is made to flow to the pumping from the pressure piping (30)
Switch between the empty stage on suction pipe road (70)；
Transfer valve (24), the transfer valve are used to make to suck the pump (22) or after the tail gas that the pump (22) is discharged
Reason agent unidirectionally passes through；
It is characterized in that, the transfer valve (24) is configured to open in the case where opening pressure, the opening pressure is based on described
What the temperature change that supplying module (20) is subjected to after empty stage obtained.
2. supplying module (20) according to claim 1, which is characterized in that the transfer valve valve (24) includes opening pressure
Setting device (240), the pressure setting device of opening can adjust the opening pressure of the transfer valve.
3. supplying module (20) according to claim 1 or 2, which is characterized in that the supplying module (20) further includes inhaling
Enter valve (22), the inlet valve (22) is arranged on the entrance side of the pump (22), and the transfer valve (24) is arranged on institute
State the outlet side of pump (22).
4. supplying module (20) according to claim 1 or 2, which is characterized in that the supplying module (20) further include
Normal operating phase is in the filter in the transfer valve (24) downstream, and the filter is connected to the pressure piping (30).
5. supplying module (20) according to claim 3, which is characterized in that the pump (22) is diaphragm pump, and the suction
Entering valve (22) and the transfer valve (24) is diaphragm valve.
6. supplying module (20) according to claim 1 or 2, which is characterized in that the opening pressure be gravity, elastic force,
At least one of magnetic force.
7. supplying module (20) according to claim 1, which is characterized in that the transfer valve (24) includes: shell
(230), the shell is equipped with conveying valve inlet (243) and conveying valve outlet (242)；It conveys valve film (241), the transfer valve
Diaphragm is fixed at the conveying valve inlet (243)；Spring (240), the spring are disposed adjacent to the conveying valve film
(241) to provide the opening pressure.
8. a kind of tail-gas after treatment apparatus, comprising:
For storing the storage tank (10) of exhaust aftertreatment agent；
Jet module (40), the jet module is for ejecting the exhaust aftertreatment agent；
Supplying module (20) as described in any one of claim 1-7, the supplying module is used for will be after the tail gas
It manages agent and is supplied to the jet module (40) from the storage tank (10)；
Suction pipeline (70), the suction pipeline are connected between the storage tank (10) and the supplying module (20)；With
Pressure piping (30), the pressure piping are connected between the supplying module (20) and the jet module (40).
9. tail-gas after treatment apparatus according to claim 8, which is characterized in that described device further includes return line
(60), the return line (60) is connected between the supplying module (20) and the storage tank (10).
10. tail-gas after treatment apparatus according to claim 9, which is characterized in that be equipped with back in the return line (60)
It flows connector (50), the backflow fittings (50) include throttle valve and check valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710675298.XA CN109386352B (en) | 2017-08-09 | 2017-08-09 | Supply module for exhaust gas aftertreatment and exhaust gas aftertreatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710675298.XA CN109386352B (en) | 2017-08-09 | 2017-08-09 | Supply module for exhaust gas aftertreatment and exhaust gas aftertreatment device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109386352A true CN109386352A (en) | 2019-02-26 |
| CN109386352B CN109386352B (en) | 2024-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710675298.XA Active CN109386352B (en) | 2017-08-09 | 2017-08-09 | Supply module for exhaust gas aftertreatment and exhaust gas aftertreatment device |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6358412B1 (en) * | 1999-01-21 | 2002-03-19 | Robert Bosch Gmbh | Feed system for fuel |
| DE102012214369A1 (en) * | 2012-08-13 | 2014-02-13 | Robert Bosch Gmbh | Exhaust aftertreatment arrangement for internal combustion engine of motor vehicle, has storage with piston arranged between conveying unit and injection valve, where reducing agent is conveyed from storage in direction of exhaust line |
| CN105121800A (en) * | 2013-02-13 | 2015-12-02 | 大陆汽车有限责任公司 | Method for providing a liquid additive |
| DE102015208565A1 (en) * | 2015-05-08 | 2016-11-10 | Robert Bosch Gmbh | Hydraulic conveying and dosing system and method for operating the hydraulic conveying and dosing system |
| CN106762048A (en) * | 2017-01-18 | 2017-05-31 | 重庆凯瑞伟柯斯环保科技有限公司 | Pumping unit and the urea liquid feed system and method for SCR system crystallization-preventive |
| CN207145038U (en) * | 2017-08-09 | 2018-03-27 | 博世汽车柴油系统有限公司 | Supplying module and tail-gas after treatment apparatus for exhaust aftertreatment |
-
2017
- 2017-08-09 CN CN201710675298.XA patent/CN109386352B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6358412B1 (en) * | 1999-01-21 | 2002-03-19 | Robert Bosch Gmbh | Feed system for fuel |
| DE102012214369A1 (en) * | 2012-08-13 | 2014-02-13 | Robert Bosch Gmbh | Exhaust aftertreatment arrangement for internal combustion engine of motor vehicle, has storage with piston arranged between conveying unit and injection valve, where reducing agent is conveyed from storage in direction of exhaust line |
| CN105121800A (en) * | 2013-02-13 | 2015-12-02 | 大陆汽车有限责任公司 | Method for providing a liquid additive |
| DE102015208565A1 (en) * | 2015-05-08 | 2016-11-10 | Robert Bosch Gmbh | Hydraulic conveying and dosing system and method for operating the hydraulic conveying and dosing system |
| CN106762048A (en) * | 2017-01-18 | 2017-05-31 | 重庆凯瑞伟柯斯环保科技有限公司 | Pumping unit and the urea liquid feed system and method for SCR system crystallization-preventive |
| CN207145038U (en) * | 2017-08-09 | 2018-03-27 | 博世汽车柴油系统有限公司 | Supplying module and tail-gas after treatment apparatus for exhaust aftertreatment |
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| Publication number | Publication date |
|---|---|
| CN109386352B (en) | 2024-05-03 |
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Address after: 214028 No.17 Xinhua Road, national high tech Industrial Development Zone, Wuxi City, Jiangsu Province Applicant after: Bosch powertrain Co.,Ltd. Address before: 214028 No.17 Xinhua Road, national high tech Industrial Development Zone, Wuxi City, Jiangsu Province Applicant before: Bosch Automotive Diesel Systems Co.,Ltd. |
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