CN102996529B - The measuring apparatus of the compressed air-driven of purifying internal combustion engine tail gas after-treatment system - Google Patents
The measuring apparatus of the compressed air-driven of purifying internal combustion engine tail gas after-treatment system Download PDFInfo
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- CN102996529B CN102996529B CN201210472641.8A CN201210472641A CN102996529B CN 102996529 B CN102996529 B CN 102996529B CN 201210472641 A CN201210472641 A CN 201210472641A CN 102996529 B CN102996529 B CN 102996529B
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 98
- 239000000376 reactant Substances 0.000 claims abstract description 57
- 239000012530 fluid Substances 0.000 claims abstract description 31
- 230000006837 decompression Effects 0.000 claims abstract description 3
- 230000007717 exclusion Effects 0.000 claims abstract description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 230000002528 anti-freeze Effects 0.000 abstract description 4
- 238000007789 sealing Methods 0.000 abstract description 4
- 239000007921 spray Substances 0.000 description 7
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 6
- 239000004202 carbamide Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000005507 spraying Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 239000002826 coolant Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009429 electrical wiring Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
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- Exhaust Gas After Treatment (AREA)
Abstract
The measuring apparatus of the compressed air-driven of purifying internal combustion engine tail gas after-treatment system, this device adopts pressurized air Direct driver liquid; This device adopts two sap cavities, by an air shut-off valve, alternately to these two sap cavity supply pressurized air, by the liquid exclusion in sap cavity to a metering valve, carrys out releasing liquid by metering valve; When a sap cavity supplies liquid to metering valve, another sap cavity then liquid make-up, such two sap cavity rotations to metering valve feed fluid incessantly, drive the same source of the gas of liquid intracavity liquid through decompression further, the liquid for being discharged by metering valve brings to nozzle ejection and enters in engine exhaust pipe.Structure of the present invention is simple, reliable, durable, insensitive to working medium, with low cost; Fluctuation impact on measuring accuracy of resisting bleed pressure easier than every other measuring apparatus; Accessible site, in reactant storage tank, saves installing space, avoids the problems such as waterproof and dustproof, sealing, antifreeze, crystallization-preventive.
Description
Technical field
The present invention relates to a kind of metering pump, especially relate to a kind of measuring apparatus of compressed air-driven of purifying internal combustion engine tail gas after-treatment system.
Background technique
The current urea injection system for diesel engine after treatment, is especially applied on medium-weight vehicle for main flow with gas auxiliary system.Gas helps urea injection system to adopt brake compression air on vehicle to be source of the gas.Common way is that pressurized air (helping spray air) is caused urea metering pump, and the urea liquid discharged by metering pump is carried into nozzle, finally sprays into engine exhaust pipe.
What come into operation at present mainly contains three kinds of metering pumps: plunger pump, diaphragm pump and gear pump.All there is following defect in all above metering pumps: 1) mechanical structure relative complex, and the complexity of structure causes reliability poor very naturally, easily goes wrong; 2) have relative mechanical motion (rotating or to-and-fro motion) to need Electromagnetic Drive or electromagnetism to combine driving with spring between some parts, these factors cause higher manufacture cost and shorter working life; 3) and some pump for working medium clarity require higher; 4) these pumps use in varying degrees under vehicle-mounted rugged environment in addition, often there will be various defect, such as in the blocking of antifreeze, crystallization-preventive, sealing, anti-ly to help in spray air pressure impacts etc.
Summary of the invention
First technical problem that the present invention will solve is to provide a kind of measuring apparatus of compressed air-driven of purifying internal combustion engine tail gas after-treatment system; This measuring apparatus structure is simple, reliable, durable, insensitive to working medium, with low cost; Owing to helping the power of spraying with the supply pressure fluctation driving liquid, fluctuation impact on measuring accuracy of resisting bleed pressure easier than every other measuring apparatus; This measuring apparatus accessible site, in reactant storage tank, also saves installing space like this, avoids some row problems such as waterproof and dustproof, sealing, antifreeze, crystallization-preventive.
For solving above-mentioned first technical problem, the present invention adopts following technological scheme:
A measuring apparatus for the compressed air-driven of purifying internal combustion engine tail gas after-treatment system, this device adopts pressurized air Direct driver liquid; This device adopts two sap cavities, by an air shut-off valve, alternately to these two sap cavity supply pressurized air, by the liquid exclusion in sap cavity to a metering valve, carrys out releasing liquid by metering valve; When a sap cavity supplies liquid to metering valve, another sap cavity then liquid make-up, such two sap cavity rotations to metering valve feed fluid incessantly, drive the same source of the gas of liquid intracavity liquid through decompression (namely helping the power of spraying) further, the liquid for being discharged by metering valve brings to nozzle ejection and enters in engine exhaust pipe.Concrete scheme is as follows:
A measuring apparatus for the compressed air-driven of purifying internal combustion engine tail gas after-treatment system, comprises air shut-off valve, the first sap cavity, the second sap cavity, the first decompressor, metering valve and controller;
Described air shut-off valve by the first pipeline external compressed air, is communicated with air by second pipe, to be connected to communicate by the 3rd pipeline with the first sap cavity, to be connected to communicate by the 4th pipeline with the second sap cavity, to be connected to communicate by the 5th pipeline with the first decompressor;
Described first sap cavity is provided with the first feed liquor one-way valve and the first fluid one-way valve, and described second sap cavity is provided with the second feed liquor one-way valve and the second fluid one-way valve; Sap cavity is communicated with reactant storage tank by feed liquor one-way valve, and when containing reactant in reactant storage tank, reactant can enter sap cavity by feed liquor one-way valve; The outlet of described first fluid one-way valve and the second fluid one-way valve to be connected with the import of metering valve by reactant delivery pipe and to communicate;
Injection pipe is entered after the outlet conduit of described metering valve and the outlet conduit of the first decompressor converge; Injection pipe sprays reactant to the exhaust duct started by nozzle;
Described controller is connected with air shut-off valve and metering valve respectively by guide line.
Preferably, described first pipeline is provided with the second decompressor; Because the pressure of current vehicle air braking system generation is mostly between 8 ~ 12bar, inconvenience directly adopts, and conveniently uses the pressurized air that vehicle air braking system produces, needs to set up the second decompressor.
Preferably, described air shut-off valve is also communicated with air by second pipe (102).
Preferably, the inlet of the first described feed liquor one-way valve and the inlet of the second feed liquor one-way valve are provided with shared filter; Make the reactant entering one-way valve not because of the blocking pipe containing granule foreign.
Preferably, as long as the mounting point of the liquid feed valve of sap cavity and liquid valve is bottom sap cavity; Such as, liquid valve also can be arranged on bottom, and liquid feed valve also can be arranged on side, also both can be arranged on bottom or side.Most preferably, described first feed liquor one-way valve is arranged on the bottom of the first sap cavity, and the first fluid one-way valve is arranged on the sidewall bottom the first sap cavity; Described second feed liquor one-way valve is arranged on the bottom of the second sap cavity, and the second fluid one-way valve is arranged on the sidewall bottom the second sap cavity.
Preferably, described first sap cavity and the second sap cavity inwall are all installed with liquid sensor, and this liquid sensor is connected with controller by datawire; Liquid sensor is used for the liquid level of assaying reaction agent.Described liquid sensor, can have two kinds, can reach same effect: 1) liquid level sensor, directly measures the liquid level in sap cavity; 2) whether there is sensor in liquid, detect and exist at the local liquid of lower dead center.If do not have liquid, that is exactly that sap cavity liquid level reaches bottom dead center position.
Preferably, described first decompressor and the second decompressor are reduction valve.
Preferably, described controller is by datawire coupled reaction agent temperature transducer and reactant liquid level sensor; For the reactant temperature in assaying reaction agent flow container and liquid level.
Preferably, described air shut-off valve is Electromagnetically driven valve, is provided with three control positions: when first position, air controls overall closed condition, the first pipeline, second pipe, the 3rd pipeline, not connected between the 4th pipeline and the 5th pipeline; When second position, the first pipeline communicates with the 3rd pipeline and the 5th pipeline respectively, and second pipe communicates with the 4th pipeline; When the 3rd position, the first pipeline communicates with the 4th pipeline and the 5th pipeline respectively, and second pipe communicates with the 3rd pipeline.
Preferably, described air shut-off valve, decompressor and metering valve are integrated into a valve island.
The present invention has following beneficial effect:
Measuring apparatus structure of the present invention is simple, reliable, durable, insensitive to working medium, with low cost; Owing to helping the power of spraying with the supply pressure fluctation driving liquid, fluctuation impact on measuring accuracy of resisting bleed pressure easier than every other measuring apparatus; This measuring apparatus accessible site, in reactant storage tank, also saves installing space like this, avoids some row problems such as waterproof and dustproof, sealing, antifreeze, crystallization-preventive.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail
Fig. 1 is a kind of example structure schematic diagram of measuring apparatus of the present invention;
Fig. 2 is the another kind of example structure schematic diagram of measuring apparatus of the present invention;
Fig. 3 is another example structure schematic diagram of measuring apparatus of the present invention;
Fig. 4 is a kind of concrete structure schematic diagram of sap cavity structure;
Fig. 5 is the another kind of concrete structure schematic diagram of sap cavity structure;
Fig. 6 is another concrete structure schematic diagram of sap cavity structure;
Fig. 7 is the automobile after-treatment system structural representation comprising measuring apparatus.
Embodiment
Embodiment 1
Shown in Figure 1, a kind of measuring apparatus of compressed air-driven of purifying internal combustion engine tail gas after-treatment system, comprises air shut-off valve 100, first sap cavity 200, second sap cavity 300, first decompressor 400, metering valve 500 and controller 600;
Described air shut-off valve 100 is by the first pipeline 101 external compressed air, air is communicated with (or by other devices by second pipe 102, such as reactant storage tank, indirect communication air), to be connected with the first sap cavity 200 by the 3rd pipeline 103 and to communicate, to be connected with the second sap cavity 300 by the 4th pipeline 104 and to communicate, to be connected with the first decompressor 400 by the 5th pipeline 105 and to communicate;
Described first sap cavity 200 is provided with the first feed liquor one-way valve 201 and the first fluid one-way valve 202, and described second sap cavity 300 is provided with the second feed liquor one-way valve 301 and the second fluid one-way valve 302; Sap cavity 200,300 is communicated with reactant storage tank 700 by feed liquor one-way valve 201,301, when containing reactant 701 in reactant storage tank 700, reactant 701 can pass through feed liquor one-way valve 201, enters sap cavity 200, can enter sap cavity 300 by feed liquor one-way valve 301; The outlet of described first fluid one-way valve 202 and the second fluid one-way valve 302 to be connected with the import of metering valve 500 by reactant delivery pipe 203 and to communicate; All one-way valves are are all opened and closed automatically by pressure-driven, adopt spring-assist to open if desired or close (not shown);
Injection pipe 402 is entered after the outlet conduit 501 of described metering valve 500 and the outlet conduit 401 of the first decompressor 400 converge; Injection pipe 402 sprays reactant to the exhaust duct started by nozzle 607;
Described controller 600 is connected with air shut-off valve 100 and metering valve 500 respectively by guide line;
Described first decompressor 400 and the second decompressor 410 are reduction valve.
Embodiment 2
Shown in Figure 3, repeat embodiment 1, difference is, described measuring apparatus also comprises following technical characteristics:
Described first pipeline 101 is provided with the second decompressor 410; Because the pressure of current vehicle air braking system generation is mostly between 8 ~ 12bar, inconvenience directly adopts, and conveniently uses the pressurized air that vehicle air braking system produces, sets up the second decompressor 410.
Embodiment 3
Shown in Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6, repeat embodiment 2, its difference is that described measuring apparatus also comprises following technical characteristics:
The inlet of the first described feed liquor one-way valve 201 and the inlet of the second feed liquor one-way valve 301 are provided with shared filter 204; Make the reactant entering one-way valve 201,301 not because of the blocking pipe containing granule foreign.
Embodiment 4
Shown in Figure 4, repeat embodiment 3, its difference is, described measuring apparatus also comprises following technical characteristics:
Described first feed liquor one-way valve 201 is arranged on the bottom of the first sap cavity 200, and the first fluid one-way valve 202 is arranged on the first sap cavity 200 on sidewall; Described second feed liquor one-way valve 301 is arranged on the bottom of the second sap cavity 300, and the second fluid one-way valve 302 is arranged on the second sap cavity 300 on sidewall;
Described first sap cavity 200 and the second sap cavity 300 inwall are all installed with liquid sensor 205, and this liquid sensor 205 is connected with controller 600 by datawire; Whether liquid sensor 205 reaches bottom dead center position for the liquid level measuring reactant in sap cavity, and namely controller 600 thinks the position of sap cavity " sky "; Liquid sensor 205 can be liquid level sensor, also can be the sensor whether relatively simple detection exists (namely with or without) liquid;
Shown in Figure 3, described controller 600 is by datawire coupled reaction agent temperature transducer 601 and reactant liquid level sensor 602; For the reactant temperature in assaying reaction agent storage tank and liquid level.
Embodiment 5
Shown in Fig. 3, Fig. 4, repeat embodiment 1 ~ 4, its difference is:
Described air shut-off valve 100 is Electromagnetically driven valves, is provided with three control positions:
When first position, air controls overall closed condition, the first pipeline 101, second pipe 102, the 3rd pipeline 103, not connected between the 4th pipeline 104 and the 5th pipeline 105;
When second position, the first pipeline 101 communicates with the 3rd pipeline 103 and the 5th pipeline 105 respectively, and second pipe 102 communicates with the 4th pipeline 104; Now, pressurized air is introduced at the same time the first decompressor 400 and the first sap cavity 200, and this intracavity liquid is pressurized to the pressure identical with the pressurized air of above-mentioned introducing; Meanwhile, the second sap cavity 300 communicates with ambient atmosphere environment, and cavity pressure is discharged, consistent with external atmospheric pressure; Under pressure-driven, first feed liquor one-way valve 201 of the first sap cavity 200 and the second fluid one-way valve 302 of the second sap cavity 300 are closed, first fluid one-way valve 202 of the first sap cavity 200 and the second feed liquor one-way valve 301 of the second sap cavity 300 are opened, and the liquid in the first sap cavity 200 is driven to metering valve 500 by reactant delivery pipe 203; Now, because the second sap cavity 300 is the same with ambient atmosphere external pressure, liquid is entered by the second feed liquor one-way valve 301 under the force of gravity and is full of the second sap cavity 300; The liquid level that this process lasts detects in the first sap cavity 200 to liquid sensor 205 drops to lower dead center, and namely controller 600 thinks the position of sap cavity 200 " sky "; At this moment, controller 600 sends signal, by air shut-off valve 100 dozens to the 3rd position;
When the 3rd position, the first pipeline 101 communicates with the 4th pipeline 104 and the 5th pipeline 105 respectively, and second pipe 102 communicates with the 3rd pipeline 103; Now, pressurized air is introduced at the same time the first decompressor 400 and the second sap cavity 300, and this intracavity liquid is pressurized to the pressure identical with the pressurized air of above-mentioned introducing; Meanwhile, the first sap cavity 200 communicates with ambient atmosphere environment, and cavity pressure is discharged, consistent with external atmospheric pressure; Under pressure-driven, second feed liquor one-way valve 301 of the second sap cavity 300 and the first fluid one-way valve 202 of the first sap cavity 200 are closed, second fluid one-way valve 302 of the second sap cavity 300 and the first feed liquor one-way valve 201 of the first sap cavity 200 are opened, and the liquid in the second sap cavity 300 is driven to metering valve 500 by reactant delivery pipe 203; Now, because the first sap cavity 200 is the same with ambient atmosphere external pressure, liquid is entered by the first feed liquor one-way valve 201 under the force of gravity and is full of the first sap cavity 200; The liquid level that this process lasts detects in the second sap cavity 300 to liquid sensor 205 drops to lower dead center, and namely controller 600 thinks the position of sap cavity 300 " sky "; At this moment, controller 600 sends signal, air shut-off valve 100 is returned again second position, and a new circulation starts; So continuous circulation is gone down, and the first sap cavity 200 and the mutual alternately alternately of the second sap cavity 300 supply the liquid with the pressurized air uniform pressure introducing sap cavity 200, sap cavity 300 and the first decompressor 400 to metering valve 500;
Described air shut-off valve 100, first decompressor 400, second decompressor 410 and metering valve 500 are integrated into a valve island;
When using installation, described controller 600, first decompressor 400, second decompressor 410, air shut-off valve 100 form first portion's (i.e. upper half part) with metering valve 500, are arranged on the top of reactant storage tank 700; Remaining reaction agent temperature transducer 601, reactant liquid level sensor 602, reactant filter 204, first sap cavity 200 and the second sap cavity 300 form second portion (i.e. lower half portion), be arranged on the inside of reactant storage tank 700, partly or entirely soak in a liquid.
Working principle is as follows:
Shown in Fig. 1, Fig. 2, Fig. 3, Fig. 7, measuring apparatus of the present invention is connected with source of compressed air (such as motor vehicle braking system compressed air storage tank) by the first pipeline 101, is connected with reactant nozzle 607 by injection pipe 402; Controller 600 is connected with Engine ECU and car load electric system by electrical wiring harness, and signal transmission also obtains power supply; In addition, controller 600 is also connected with other subtense angle of DeNOx system or component, before such as SCR, temperature transducer 603 is connected with temperature transducer after SCR 604, NOx sensor 605, engine coolant circulation control valve 606 etc., for obtaining information and send control signal;
Described air shut-off valve 100 is by the first pipeline 101 external compressed air, and pressurized air is first decompressed to the pressure (hydraulic pressure) driven required for reactant liquid through the second decompressor 410, i.e. metering valve 500 inlet pressure; Then the pressurized air of air shut-off valve 100 is transported to the first decompressor 400 again, pressurized air is decompressed to and helps spray air pressure by the first decompressor 400 further, namely metering valve 500 exports and enters the pressure (helping the power of spraying) of nozzle 607, the liquid joint discharged with metering valve 500, and liquid is carried into nozzle 607, finally liquid is sprayed in motor 608 outlet pipe 609.If in some applications, bleed pressure is lower, just need not 2 grades reduced pressure, directly can adopt, that is can save the second decompressor 410, just as described in Example 1.
Shown in Figure 4, in the present embodiment, controller 600 is whether the liquid level detected respectively in the first sap cavity 200 and the second sap cavity 300 according to liquid sensor 205 have decreased to lower dead center; Here liquid level minimum permission position (i.e. lower dead center) in determining positions the first sap cavity 200 of installing of liquid sensor 205 and the second sap cavity 300; When the liquid level of a certain sap cavity arrives this position, controller 600 thinks this sap cavity " sky ", can not again to metering valve 500 feed fluid, commander's air shut-off valve 100 change of location, taken over by another sap cavity and continue to metering valve 500 feed fluid, the sap cavity of this " sky " starts liquid make-up.
Except adopting except liquid sensor 205 judges lower dead center, another kind of way is exactly that the amount of being full of by calculating each sap cavity and discharge capacity are determined.In a certain circulation, the amount of being full of of sap cavity (namely sap cavity liquid make-up complete after liquid level position) be determined by the position of reactant storage tank liquid level at that time.Controller 600 can know liquid level height at that time by the liquid level sensor 602 read in reactant storage tank 700.Be aware of the position of the height of liquid level in reactant storage tank 700, sap cavity geometrical shape, sap cavity sectional area and sap cavity lower dead center, what we just can calculate that sap cavity stored specifically can be used for the amount of reactant; Start to just starting accumulative liquid releasing quantity during metering valve 500 feed fluid at this sap cavity, when metering valve 500 Cumulative release amount reach this sap cavity can be used for amount time, controller 600 can judge: this sap cavity " sky ", air shut-off valve 100 should be allowed to change position;
The first more satisfactory decompressor 400 can produce a constant pressure drop, although can be changed with the input air pressure change of the first decompressor 400 by the pressure (helping the power of spraying) after the first decompressor 400 step-down, but because this input air pressure is consistent with the hydraulic pressure of input metering valve all the time, so the liquid gas pressure power missionary society relative constancy between metering valve entrance and outlet, namely hydraulic pressure remains a constant pressure reduction with helping the power of spraying; At this moment, if fixed in the gap that metering valve 500 is opened, the time just can opened by controlling metering valve 500 accurately controls reactant releasing quantity.
Implement 6
Repeat embodiment 5, its difference is only:
In some applications, the first sap cavity 200 and the second sap cavity 300 can be replaced with pipeline, as shown in Figure 5.In the example as shown in fig. 5, in fact the first sap cavity 200 and the second sap cavity 300 are replaced by two U-shaped pipes respectively; In the bottom of left side U-shaped pipe, the first feed liquor one-way valve 201 is installed, in the bottom of right side U-shaped pipe, the second feed liquor one-way valve 301 is installed; At U-shaped pipe outlet end top, left side, the first fluid one-way valve 202 is installed, at U-shaped pipe outlet end top, right side, the second fluid one-way valve 302 is installed; Metering valve 500 is flowed to by a common reactant delivery pipe 203 after liquid leaves fluid one-way valve 202,302.
In the above example, we can notice a phenomenon, if these sap cavities all stand and put, the liquid level (i.e. liquid level) that the degree that in sap cavity, each liquid is full of can be subject to reactant storage tank (flow container) affects.That is, time flow container is full, each sap cavity will fill full, and time flow container is more empty, the liquid supplemented in each sap cavity will lack.Under normal conditions, this can not the normal work of influential system.In some applications, if this is a problem, sap cavity can be designed to lie low bottom flow container.Even if such sap cavity also can fill with to obtain relatively fuller (shown in Figure 6) when liquid level of tank is lower.
If sap cavity sectional area is excessive, the sap cavity of such as horizontal lying-type, freeze at cold snap to prevent reactant, sap cavity is damaged due to volumetric expansion, (not shown) that is that the wall of sap cavity can be designed to ripple or wrinkle, allows sap cavity having a certain amount of resiliently deformable considerably beyond time normal operating pressure (requiring pressure height point).
The shape of sap cavity can be any shape, according to requirements with manufacture, easy for installationly to determine, with cylindric (tubulose), square tube shape or the relatively good manufacture of rectangular tubular when general.
Embodiment 7
Shown in Figure 7, the system and device of measuring apparatus in Vehicular exhaust reprocessing of a kind of embodiment of utilization 1 ~ 6: comprise measuring apparatus 1000 arbitrary in temperature transducer 604, NOx sensor 605, liquid circulation control valve 606, reactant storage tank 700, heat exchanger 612 and embodiment 1 ~ 6 after temperature transducer 603 before motor 608, exhaust duct 609, nozzle 607, SCR baffler 610, SCR catalyst 611, SCR, SCR;
Before described nozzle 607, SCR baffler 610, SCR, after temperature transducer 603, SCR catalyst 611, SCR, temperature transducer 604 and NOx sensor 605 are successively set on exhaust duct 609;
Described measuring apparatus 1000 connects nozzle 607 by pipeline 402;
The liquid circulation pipeline of described motor 608 is as the heating pipe of heat exchanger 612; When cold snap, heat exchanger 612, for heating the reactant 701 in reactant storage tank 700, controls heat exchange by liquid circulation control valve 606; In this example, measuring apparatus 1000 and reactant storage tank 700 integrate.
Wherein reactant storage tank 700 top is also provided with reactant filler (not shown) and pressure regulator valve 613; The pressure that pressure regulator valve 613 makes the inside and outside maintenance of reactant storage tank 700 identical.Whenever, when having pressure difference inside and outside reactant storage tank 700, this valve is just opened; Reactant storage tank 700 is built-in with heat exchanger 612, be connected with engine cooling circulating liquid, when arctic weather needs heating reactant, controller 600 opens engine coolant circulation control valve 606, engine coolant is made to circulate through heat exchanger 612, heating reactant;
Reactant measuring apparatus 1000, from the agent of reactant storage tank 700 abstraction reaction, measures according to motor 608 operating conditions and discharges the reactant of appropriate amount; The reactant discharged sprays into engine exhaust pipe 609 by nozzle 607, under the help of SCR catalyst 611, chemical reaction is produced with the NOx in engine exhaust after mixing with exhaust, reach and reduce NOx emission effect, current normally used reactant is the aqueous solution of urea of (aqueous solution of urea eutectic point) 32.5% concentration.
The word in above adopted description orientation " on ", D score, "left", "right" etc. are all convenience in order to illustrate based on the orientation in accompanying drawing shown in drawing, in actual device, these orientation may be different due to the disposing way of device.
Obviously, the above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here cannot give exhaustive to all mode of executions.Every belong to technological scheme of the present invention the apparent change of extending out or variation be still in the row of protection scope of the present invention.
Claims (9)
1. the measuring apparatus of the compressed air-driven of purifying internal combustion engine tail gas after-treatment system, is characterized in that:
This device adopts pressurized air Direct driver liquid; This device adopts two sap cavities, by least one air shut-off valve, alternately to these two sap cavity supply pressurized air, by the liquid exclusion in sap cavity to metering valve, carrys out releasing liquid by metering valve; When a sap cavity supplies liquid to metering valve, another sap cavity then liquid make-up, such two sap cavity rotations to metering valve feed fluid incessantly, drive the same source of the gas of liquid intracavity liquid through decompression further, the liquid for being discharged by metering valve brings to nozzle ejection and enters in engine exhaust pipe;
This device specifically comprises air shut-off valve (100), the first sap cavity (200), the second sap cavity (300), the first decompressor (400), metering valve (500) and controller (600);
Described air shut-off valve (100) is by the first pipeline (101) external compressed air, to be connected with the first sap cavity (200) by the 3rd pipeline (103) and to communicate, to be connected with the second sap cavity (300) by the 4th pipeline (104) and to communicate, to be connected with the first decompressor (400) by the 5th pipeline (105) and to communicate;
Described first sap cavity (200) is provided with the first feed liquor one-way valve (201) and the first fluid one-way valve (202), and described second sap cavity (300) is provided with the second feed liquor one-way valve (301) and the second fluid one-way valve (302); The outlet of described first fluid one-way valve (202) and the second fluid one-way valve (302) to be connected with the import of metering valve (500) by reactant delivery pipe (203) and to communicate;
Injection pipe (402) is entered after the outlet conduit (501) of described metering valve (500) and the outlet conduit (401) of the first decompressor converge;
Described controller (600) is connected with air shut-off valve (100) and metering valve (500) respectively by guide line;
First decompressor can produce a constant pressure drop.
2. measuring apparatus according to claim 1, is characterized in that: described first pipeline (101) is provided with the second decompressor (410); Described air shut-off valve is also communicated with air by second pipe (102).
3. measuring apparatus according to claim 1, is characterized in that: the inlet of the first described feed liquor one-way valve (201) and the inlet of the second feed liquor one-way valve (301) are provided with shared filter (204).
4. measuring apparatus according to claim 3, it is characterized in that: described first feed liquor one-way valve (201) is arranged on the bottom of the first sap cavity (200), the first fluid one-way valve (202) is arranged on the first sap cavity (200) on sidewall; Described second feed liquor one-way valve (301) is arranged on the bottom of the second sap cavity (300), and the second fluid one-way valve (302) is arranged on the second sap cavity (300) on sidewall.
5. measuring apparatus according to claim 3, it is characterized in that: described first sap cavity (200) and the second sap cavity (300) inwall are all installed with liquid sensor (205), and liquid sensor (205) is connected with controller (600) by datawire.
6. measuring apparatus according to claim 3, is characterized in that: described controller (600) is by datawire coupled reaction agent temperature transducer (601) and reactant liquid level sensor (602).
7., according to described measuring apparatus arbitrary in claims 1 to 3, it is characterized in that: described air shut-off valve (100) is Electromagnetically driven valve, be provided with three control positions:
When first position, air shut-off valve (100) overall closed condition, the first pipeline (101), second pipe (102), the 3rd pipeline (103), not connected between the 4th pipeline (104) and the 5th pipeline (105);
When second position, the first pipeline (101) communicates with the 3rd pipeline (103) and the 5th pipeline (105) respectively, and second pipe (102) communicates with the 4th pipeline (104);
When the 3rd position, the first pipeline (101) communicates with the 4th pipeline (104) and the 5th pipeline (105) respectively, and second pipe (102) communicates with the 3rd pipeline (103).
8. measuring apparatus according to claim 2, is characterized in that: described first decompressor (400) and the second decompressor (410) are reduction valve.
9., according to described measuring apparatus arbitrary in claims 1 to 3, it is characterized in that: described air shut-off valve (100), decompressor and metering valve (500) are integrated into valve island.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210472641.8A CN102996529B (en) | 2012-11-20 | 2012-11-20 | The measuring apparatus of the compressed air-driven of purifying internal combustion engine tail gas after-treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN104632333B (en) * | 2013-11-08 | 2017-09-26 | 武汉芙源生环保技术有限公司 | The metering device of the compressed air-driven of purifying internal combustion engine tail gas after-treatment system |
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| DE102005002318A1 (en) * | 2005-01-17 | 2006-07-27 | Robert Bosch Gmbh | Exhaust gas aftertreatment process and device for this purpose |
| CN101158306A (en) * | 2006-02-10 | 2008-04-09 | 张家口百通环保科技有限公司 | Internal-combustion engines exhaust gas purifying device and working method thereof |
| US8943808B2 (en) * | 2010-09-27 | 2015-02-03 | Caterpillar Inc. | Reductant dosing system |
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