CN102979604A - Reducing agent spraying and metering device - Google Patents
Reducing agent spraying and metering device Download PDFInfo
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- CN102979604A CN102979604A CN2012104934942A CN201210493494A CN102979604A CN 102979604 A CN102979604 A CN 102979604A CN 2012104934942 A CN2012104934942 A CN 2012104934942A CN 201210493494 A CN201210493494 A CN 201210493494A CN 102979604 A CN102979604 A CN 102979604A
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- reducing agent
- supply pump
- pump
- sprays
- pressure air
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a reducing agent spraying and metering device, which comprises a reducing agent storing box, a supply pump, a metering valve, a mixing cavity, an atomizing nozzle, a controller, a switching valve and a low-pressure air pump, wherein a reducing agent of the reducing agent storing box is mixed in the mixing cavity through the supply pump and the metering valve, is then atomized through the atomizing nozzle, is sprayed into an exhaust pipe, is mixed with waste gas, and is reduced and purified; the low-pressure air pump is used for supplying pressure air to the mixing cavity during working of an engine, and sweeping the reducing agent in the supply pump and a pipeline behind the supply pump back into the reducing agent storing box when the engine stops working; and the switching valve is used for controlling and switching the reducing agent storing box to supply the reducing agent and pressure gas of the low-pressure air pump to sweep the supply pump and the pipeline behind the supply pump. An independent air source is adopted, so that the pressure is stable and does not fluctuate along with the change of the working condition of the engine, automobile compressed air is not consumed, and the potential safety hazard of compressed air leakage is eliminated. A cleaning method of the spraying and metering device is simple, and a complete effect is achieved.
Description
Technical field
The present invention relates to a kind of reducing agent and spray measuring apparatus, be used for liquid reducing agent is mixed into waste gas streams.
Background technique
Increasingly serious along with environmental problem and energy crisis; the Abgasgesetz increasingly stringent; increasing energy-conserving and emission-cutting technology is applied in the vehicle; SCR(selective catalytic reduction wherein) technology is a kind of method that reduces oxynitride discharge, and the SCR technology is exactly with urea liquid, a kind of reducing agent; be injected in the waste gas streams of motor; discharge ammonia, ammonia in the SCR catalytic converter with waste gas in oxynitrides reaction generate the nitrogen G﹠W, thereby reach the purification purpose.This reducing agent of urea liquid can cause crystallization with contact with air, and spraying needs to empty after measuring apparatus uses end, avoids the device inner passage to stop up.
The SCR system mainly contains air-assisted and sprays measuring apparatus without air-assisted two classes at present.Emptying of residual urea solution without the auxiliary urea-spray device of air is to adopt the fluid power pipeline to switch to realize, system is comparatively complicated, referenced patent DE102006033027.And air-assisted urea-spray measuring apparatus adopts compressed air units in cars that the pipeline after the mixing chamber is cleaned, specifically can referenced patent CN100587263C, the defective of this method is to consume compressed air units in cars, has potential safety hazard, cleans not exclusively in addition.
Summary of the invention
The object of the invention is a kind of reliability height to be provided, to empty completely reducing agent injection of effect measuring apparatus for the defective of prior art.
The present invention adopts following technological scheme for achieving the above object:
A kind of reducing agent sprays measuring apparatus, comprises reducing agent storage tank, supply pump, metering valve, mixing chamber, atomizer nozzle and controller; The reducing agent of reducing agent storage tank sprays into outlet pipe and waste gas mixing reduction purification by the atomizer nozzle atomizing after mixing through metering valve by supply pump again in mixing chamber, it is characterized in that: described device also comprises switching valve and low pressure air pump; When providing pressure air and engine stop work to mixing chamber when described low pressure air pump is used for engine operation with described supply pump and thereafter the reducing agent in the pipeline purge back the reducing agent storage tank; Described switching valve provides reducing agent and low pressure gas pumping pressure gas to reach thereafter to supply pump for control switching reducing agent storage tank to supply pump, and pipeline purges.
It is further characterized in that: described switching valve is two-position three-way valve; During no electric circuit, reducing agent directly flows to supply pump by two-position three-way valve; After the energising, the low pressure air pump purges used pressed gas for supply pump provides.
Further: described low pressure gas delivery side of pump gas pressure is not less than 50KPa.
Preferred scheme: between described supply delivery side of pump and metering valve, be provided with filter.
Described filter is provided with pressure transducer, is used for pressure signal is fed back to controller the rotating speed of control supply pump.
The difference of the technical solution adopted in the present invention and prior art is that when needs sprayed metering, reducing agent directly passed through the normal open pipeline of two-bit triplet solenoid valve, by entering filter behind the supply pump supercharging reducing agent; When this device needs to clean, two-bit triplet closed electromagnetic valve normal open pipeline, switch the inlet passage that is communicated with low pressure gas delivery side of pump and supply pump, pressed gas enters supply pump spatial pipeline system inner and that originally contact with reducing agent afterwards, under the effect that pressed gas washes away, residual reducing agent is blown back the reducing agent storage tank, thus the emptying fully of implement device.
The present invention adopt one independently the low pressure air pump provide pressed gas for spraying measuring apparatus, pressed gas mixes with reductant solution in mixing chamber, then by Pipeline transport to atomizer nozzle, the atomizing of realization reducing agent.Be mixing chamber and afterwards pipeline and atomizer nozzle feeds air under pressure in the course of the work, in order to keep the unimpeded of whole injection line always.
Good effect of the present invention is: independent bleed pressure is stable, can not fluctuate along with the working conditions change of motor, does not consume compressed air units in cars, has eliminated the potential safety hazard that pressurized air is revealed.The cleaning method of this injection measuring apparatus is simple, and effect is complete.
Description of drawings
Fig. 1 is the principle schematic that reducing agent of the present invention sprays measuring apparatus.
Among the figure: 1-reducing agent storage tank, 2-two-position three-way valve, 3-supply pump drive motor, 4-low pressure air pump, 5-low pressure air pump drive motor, 6-controller, 7-NOx sensor, 8-exhaust gas temperature sensor, 9-outlet pipe, 10-catalytic converter, 11-atomizer nozzle, 12-mixing chamber, 13-metering valve, 14-pressure transducer, 15-filter, 16-throttle valve, 17-supply pump.
Embodiment
At first according to the principle schematic of Fig. 1, the fundamental function of spraying measuring apparatus is described.Reducing agent preferably adopts urea liquid, is stored in advance in the reducing agent storage tank 1.The core component of this injection measuring apparatus is supply pump 17 and low pressure air pump 4.When engine operation, supply pump 17 in this injection measuring apparatus is with the normal open path direct sucking-off of the urea liquid in the reducing agent storage tank 1 by two-position three-way valve 2, then be pumped out in the filter 15, urea liquid part in the filter 15 flows back in the reducing agent storage tank 1 through throttle valve 16, and a part enters into mixing chamber 12 by metering valve 13.Carry out pressure feedback by the pressure transducer 14 that is installed on the filter 15, change the rotating speed of supply pump drive motor 3, be used for regulating the delivery volume of supply pump 17, so that the urea liquid pressure in the filter 15 is kept stable all the time.By pulse width modulation controlled metering valve 13 emitted doses, reach the consumption that needs to transform the oxynitrides in the waste gas.The low pressure air pump 4 that is driven by low pressure air pump drive motor 5 simultaneously is transported to pressed gas in the mixing chamber 12, and pressed gas will form the back pressure of mixing chamber 12, and goal-setting is at 50kpa.When spraying urea liquid, metering valve 13 enters in mixing chamber 12, urea liquid will be pre-mixed with pressed gas, delivering to atomizer nozzle 11 by delivery line atomizes, in outlet pipe 9, mix mutually with the waste gas of motor subsequently, the direction of arrow catalytic converter 10 of flowing through as shown in Figure 1, reaction generates the nitrogen G﹠W, thereby realizes purifying the purpose of oxynitrides.
When engine stop is worked, device enters the cleaning state automatically, two-bit triplet solenoid valve 2 cuts out the normal open pipeline, switch the outlet of connection low pressure air pump 4 and the inlet passage of supply pump 17, then pressed gas enters in the supply pump 17, along with pressed gas passes through supply pump 17, filter 15 and throttle valve 16, the urea liquid that remains in the device will blow back in the reducing agent storage tank 1.Exhaust gas temperature sensor 8 is arranged in the upstream near catalytic converter 10, is used for the reaction temperature of estimation catalytic converter 10.NOx sensor 7 is arranged between outlet pipe 9 and the catalytic converter 10, for the content of the NOx that measures waste gas.Controller 6 calculates the urea amount of needs according to the engine operating condition data, and the driving pulsewidth of control metering valve 13 realizes the metering of reducing agent.
Claims (5)
1. a reducing agent sprays measuring apparatus, comprises reducing agent storage tank, supply pump, metering valve, mixing chamber, atomizer nozzle and controller; The reducing agent of reducing agent storage tank sprays into outlet pipe and waste gas mixing reduction purification by the atomizer nozzle atomizing after mixing through metering valve by supply pump again in mixing chamber, it is characterized in that: described device also comprises switching valve and low pressure air pump; When providing pressure air and engine stop work to mixing chamber when described low pressure air pump is used for engine operation with described supply pump and thereafter the reducing agent in the pipeline purge back the reducing agent storage tank; Described switching valve provides reducing agent and low pressure gas pumping pressure gas to reach thereafter to supply pump for control switching reducing agent storage tank to supply pump, and pipeline purges.
2. reducing agent as claimed in claim 1 sprays measuring apparatus, and it is characterized in that: described switching valve is two-position three-way valve; During no electric circuit, reducing agent directly flows to supply pump by two-position three-way valve; After the energising, the low pressure air pump purges used pressed gas for supply pump provides.
3. reducing agent as claimed in claim 1 sprays measuring apparatus, and it is characterized in that: described low pressure gas delivery side of pump gas pressure is not less than 50KPa.
4. reducing agent as claimed in claim 1 sprays measuring apparatus, it is characterized in that: be provided with filter between described supply delivery side of pump and the metering valve.
5. reducing agent as claimed in claim 4 sprays measuring apparatus, and it is characterized in that: described filter is provided with pressure transducer, is used for pressure signal is fed back to controller the rotating speed of control supply pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210493494.2A CN102979604B (en) | 2012-11-28 | 2012-11-28 | Reducing agent spraying and metering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210493494.2A CN102979604B (en) | 2012-11-28 | 2012-11-28 | Reducing agent spraying and metering device |
Publications (2)
| Publication Number | Publication Date |
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| CN102979604A true CN102979604A (en) | 2013-03-20 |
| CN102979604B CN102979604B (en) | 2015-07-01 |
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| CN201210493494.2A Active CN102979604B (en) | 2012-11-28 | 2012-11-28 | Reducing agent spraying and metering device |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103266937A (en) * | 2013-05-21 | 2013-08-28 | 中国第一汽车股份有限公司 | Gas-assisted urea injection system utilizing gravity metering method |
| CN103352745A (en) * | 2013-06-20 | 2013-10-16 | 厚德融智(北京)云计算技术研究院 | Air assisted type urea pump system |
| CN103511044A (en) * | 2013-09-30 | 2014-01-15 | 天津亿利汽车环保科技有限公司 | Scr temperature control system |
| CN104819039A (en) * | 2015-04-27 | 2015-08-05 | 东莞正扬电子机械有限公司 | Urea pump and urea system containing same |
| CN105464761A (en) * | 2016-01-11 | 2016-04-06 | 南京中船绿洲环保有限公司 | Urea injection system for boat and injection method of urea injection system |
| CN105464762A (en) * | 2014-07-01 | 2016-04-06 | 博世汽车柴油系统有限公司 | Selective catalytic reduction system |
| CN106285851A (en) * | 2016-09-22 | 2017-01-04 | 凯龙高科技股份有限公司 | A kind of dosing pump fluid path blow device |
| CN106437959A (en) * | 2015-08-04 | 2017-02-22 | 浙江福爱电子有限公司 | Gas-liquid mixing type SCR spraying device |
| CN106555646A (en) * | 2016-11-16 | 2017-04-05 | 中国北方发动机研究所(天津) | A kind of metering atomising spraying system of SCR |
| CN109983206A (en) * | 2016-11-22 | 2019-07-05 | 沃尔沃卡车集团 | Equipment for exhaust after treatment system |
| CN113090362A (en) * | 2021-04-27 | 2021-07-09 | 广西卡迪亚科技有限公司 | Urea supersonic jet ejector structure and engine SCR tail gas emission post-treatment system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH716216A1 (en) * | 2019-05-22 | 2020-11-30 | Liebherr Machines Bulle Sa | System for injecting a liquid into a pipe. |
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| US6041594A (en) * | 1997-06-21 | 2000-03-28 | Robert Bosch Gmbh | Mixture delivery device for internal combustion engines |
| WO2000079108A1 (en) * | 1999-06-22 | 2000-12-28 | Robert Bosch Gmbh | Device for dosing a reducing agent |
| JP2007327377A (en) * | 2006-06-07 | 2007-12-20 | Hitachi Ltd | Exhaust emission control device |
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| CN101405489A (en) * | 2006-03-21 | 2009-04-08 | 罗伯特·博世有限公司 | Method and metering system for reducing pollutants in motor vehicle exhaust gases |
-
2012
- 2012-11-28 CN CN201210493494.2A patent/CN102979604B/en active Active
Patent Citations (5)
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| US6041594A (en) * | 1997-06-21 | 2000-03-28 | Robert Bosch Gmbh | Mixture delivery device for internal combustion engines |
| WO2000079108A1 (en) * | 1999-06-22 | 2000-12-28 | Robert Bosch Gmbh | Device for dosing a reducing agent |
| CN101103184A (en) * | 2004-12-15 | 2008-01-09 | 因勒纪汽车系统研究公司 | System for storing an additive and for injecting it into engine exhaust gases |
| CN101405489A (en) * | 2006-03-21 | 2009-04-08 | 罗伯特·博世有限公司 | Method and metering system for reducing pollutants in motor vehicle exhaust gases |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103266937A (en) * | 2013-05-21 | 2013-08-28 | 中国第一汽车股份有限公司 | Gas-assisted urea injection system utilizing gravity metering method |
| CN103352745A (en) * | 2013-06-20 | 2013-10-16 | 厚德融智(北京)云计算技术研究院 | Air assisted type urea pump system |
| CN103511044A (en) * | 2013-09-30 | 2014-01-15 | 天津亿利汽车环保科技有限公司 | Scr temperature control system |
| CN103511044B (en) * | 2013-09-30 | 2015-12-02 | 天津亿利汽车环保科技有限公司 | Scr temperature control system |
| CN105464762A (en) * | 2014-07-01 | 2016-04-06 | 博世汽车柴油系统有限公司 | Selective catalytic reduction system |
| CN104819039A (en) * | 2015-04-27 | 2015-08-05 | 东莞正扬电子机械有限公司 | Urea pump and urea system containing same |
| CN106437959A (en) * | 2015-08-04 | 2017-02-22 | 浙江福爱电子有限公司 | Gas-liquid mixing type SCR spraying device |
| CN106437959B (en) * | 2015-08-04 | 2019-01-01 | 浙江福爱电子有限公司 | A kind of gas-liquid mixed SCR injection apparatus |
| CN105464761A (en) * | 2016-01-11 | 2016-04-06 | 南京中船绿洲环保有限公司 | Urea injection system for boat and injection method of urea injection system |
| CN105464761B (en) * | 2016-01-11 | 2017-11-03 | 南京中船绿洲环保有限公司 | A kind of urea injection system peculiar to vessel and its injection method |
| CN106285851A (en) * | 2016-09-22 | 2017-01-04 | 凯龙高科技股份有限公司 | A kind of dosing pump fluid path blow device |
| CN106555646A (en) * | 2016-11-16 | 2017-04-05 | 中国北方发动机研究所(天津) | A kind of metering atomising spraying system of SCR |
| CN106555646B (en) * | 2016-11-16 | 2018-08-10 | 中国北方发动机研究所(天津) | A kind of metering atomising spraying systems of SCR |
| CN109983206A (en) * | 2016-11-22 | 2019-07-05 | 沃尔沃卡车集团 | Equipment for exhaust after treatment system |
| CN109983206B (en) * | 2016-11-22 | 2021-12-03 | 沃尔沃卡车集团 | Device for an exhaust gas aftertreatment system and method for controlling a flow of a reducing agent in a device for an engine exhaust gas aftertreatment system |
| CN113090362A (en) * | 2021-04-27 | 2021-07-09 | 广西卡迪亚科技有限公司 | Urea supersonic jet ejector structure and engine SCR tail gas emission post-treatment system |
| CN113090362B (en) * | 2021-04-27 | 2024-04-16 | 广西沃宾电子科技有限责任公司 | Urea supersonic jet ejector structure and engine SCR exhaust emission aftertreatment system |
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| CN102979604B (en) | 2015-07-01 |
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Effective date of registration: 20170613 Address after: 214063 Jiangsu province Binhu District of Wuxi City Qian Rong Lu No. 15 Patentee after: China FAW Group Corporation Address before: 214063 Jiangsu province Binhu District of Wuxi City Qian Rong Lu No. 15 Patentee before: Wuxi Oil Pump Nozzle Institute of First Automobile Works |