CN212535820U - Novel air-assisted urea injection system - Google Patents
Novel air-assisted urea injection system Download PDFInfo
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- CN212535820U CN212535820U CN202021364257.2U CN202021364257U CN212535820U CN 212535820 U CN212535820 U CN 212535820U CN 202021364257 U CN202021364257 U CN 202021364257U CN 212535820 U CN212535820 U CN 212535820U
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
The utility model relates to a motor vehicle exhaust emission control technical field especially relates to a novel gas-assisted urea injection system, take urea pump assembly including SCR aftertreatment assembly, urea nozzle, oil and gas separator, whole car braking gas holder, pressure-limiting valve, urea pipe, urea case, whole car braking gas holder, pressure-limiting valve, oil and gas separator and urea case take the urea pump assembly to loop through first trachea, second trachea and third trachea and be connected, the urea case take the urea pump assembly pass through the urea pipe with the urea nozzle is connected, the urea nozzle set up in the upper reaches of SCR aftertreatment assembly. The whole vehicle adopts an air-assisted urea injection system and shares an air storage cylinder with an air brake type braking system. Under the limit condition of frequent braking on a long downhill, the air pressure is reduced too fast to be lower than the normal working pressure of a braking system, so that the stable work of the braking system is influenced, and the potential safety hazard that the vehicle cannot be braked in time possibly exists.
Description
Technical Field
The utility model relates to a motor vehicle exhaust emission control technical field especially relates to a novel gas-assisted urea injection system.
Background
With the increasing requirements of domestic and foreign laws and regulations on the emission limit of automobiles, particularly after the implementation of national five-stage emission laws and regulations, part of diesel vehicles have to adopt an SCR system mode to reduce NOx in exhaust emission. The Selective Catalytic Reduction (SCR) technology consists of an aftertreatment catalyst and a urea injection system. And urea aqueous solution with the concentration of 32.5% is sprayed into the exhaust pipe, the urea aqueous solution is hydrolyzed into NH3 under the action of high temperature of exhaust gas, and NOx in the exhaust gas is reduced into N2 and H2O under the action of a catalyst.
Urea injection systems are classified into air-assisted injection systems and non-air-assisted injection systems according to the difference in power source of urea injection. The air-assisted urea injection system has air source from air cylinder installed in the vehicle and timing inflation of the air cylinder with the engine inflating pump to maintain the air cylinder in certain pressure range. To reduce costs, urea injection systems typically share the air reservoir of the brake system. The brake system and the urea injection system use gas simultaneously, so that the pressure fluctuation of a gas source is caused, and great challenge is brought to the stable work of the whole vehicle brake system and the urea system.
Based on the above reason, the utility model provides a novel air-assisted urea injection system.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's not enough, provide a novel air-assisted urea injection system, under the condition in the face of diesel state five-stage emission regulation, whole car adopts air-assisted urea injection system, with the gas receiver of braking system sharing of formula of stopping. The brake system and the urea injection system use air simultaneously, which may cause the air pressure to fluctuate up and down, and influence the stable work of the urea injection system. Under the limit condition of frequent braking on a long downhill, the air pressure is reduced too fast to be lower than the normal working pressure of a braking system, so that the stable work of the braking system is influenced, and the potential safety hazard that the vehicle cannot be braked in time possibly exists.
In order to realize the utility model discloses a purpose, the utility model discloses a technical scheme do:
the utility model discloses a novel gas-assisted urea injection system, including SCR aftertreatment assembly, urea nozzle, oil-gas separator, whole car braking gas holder, pressure-limiting valve, urea pipe, urea case area urea pump assembly, whole car braking gas holder, pressure-limiting valve, oil-gas separator and urea case area urea pump assembly loop through first trachea, second trachea and third trachea and are connected, urea case area urea pump assembly pass through the urea pipe with the urea nozzle is connected, the urea nozzle set up in the upper reaches of SCR aftertreatment assembly; the urea injection system is characterized in that when the air pressure of the brake air storage tank of the whole vehicle is lower than the normal working pressure of the brake system, the pressure limiting valve is closed, the working air pressure of the brake system is ensured to be higher than the normal working air pressure, the brake system is ensured to work normally, and potential safety hazards are avoided.
According to the urea injection system, urea aqueous solution is injected twice, so that the urea injection atomization effect can be ensured to the maximum extent, and the influence of air pressure fluctuation on the normal work of the urea injection system is avoided. The urea water solution is sprayed into the mixing cavity for the first time through the urea metering valve for the first time to be atomized and is fully mixed with the compressed air. And the urea reaches a urea nozzle arranged on the SCR post-treatment assembly through a urea pipe, and the urea is sprayed for the second time into an exhaust pipeline for the second time of atomization.
The urea box with urea pump assembly comprises a diaphragm pump, a urea filter element, a urea metering valve, a mixing cavity, an air electromagnetic valve, a backflow valve, a urea box and a urea box filter element, wherein one end of the electromagnetic valve is connected with the oil-gas separator through a third air pipe, the other end of the electromagnetic valve is connected with one end of the mixing cavity, and the other end of the mixing cavity is connected with the urea nozzle through the urea pipe; mixing chamber, urea metering valve, urea filter core, backward flow valve, urea case filter core and urea case loop through the tube coupling, the diaphragm pump set up in the urea filter core with between the urea case filter core with the backward flow valve is parallelly connected.
The beneficial effects of the utility model reside in that:
(1) the utility model discloses whole car adopts gas to help formula urea injection system, with air brake formula braking system sharing gas receiver. The brake system and the urea injection system use air simultaneously, which may cause the air pressure to fluctuate up and down, and influence the stable work of the urea injection system. Under the limit condition of frequent braking on a long downhill, the air pressure is reduced too fast to be lower than the normal working pressure of a braking system, so that the stable work of the braking system is influenced, and the potential safety hazard that the vehicle cannot be braked in time possibly exists.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1. SCR aftertreatment assembly, 2, urea nozzle, 3, oil-gas separator, 4, whole car braking gas holder, 5, pressure limiting valve, 6, first trachea, 7, second trachea, 8, third trachea, 9, urea pipe, 10, urea case area urea pump assembly, A, diaphragm pump, B, urea filter core, C, urea metering valve, D, mixing chamber, E, air solenoid valve, F, backward flow valve, G, urea case, H, urea case filter core.
Detailed Description
The following further description of the present invention:
referring to fig. 1 of the drawings, a drawing,
the utility model discloses a novel air-assisted urea injection system, including SCR aftertreatment assembly 1, urea nozzle 2, oil and gas separator 3, whole car braking gas holder 4, pressure-limiting valve 5, urea pipe 9, urea case area urea pump assembly 10, whole car braking gas holder 4, pressure-limiting valve 5, oil and gas separator 3 and urea case area urea pump assembly 10 loop through first trachea 6, second trachea 7 and third trachea 8 and are connected, urea case area urea pump assembly 10 pass through urea pipe 9 with urea nozzle 2 connects, urea nozzle 2 set up in SCR aftertreatment assembly 1's upper reaches.
The urea box with urea pump assembly 10 comprises a diaphragm pump A, a urea filter element B, a urea metering valve C, a mixing cavity D, an air electromagnetic valve E, a reflux valve F, a urea box G and a urea box filter element H, wherein one end of the electromagnetic valve E is connected with the oil-gas separator 3 through a third air pipe 8, the other end of the electromagnetic valve E is connected with one end of the mixing cavity D, and the other end of the mixing cavity D is connected with the urea nozzle 2 through a urea pipe 9; mixing chamber D, urea metering valve C, urea filter core B, backward flow valve F, urea case filter core H and urea case G loop through the tube coupling, the diaphragm pump set up in urea filter core B with between the urea case filter core H with backward flow valve F is parallelly connected.
After the vehicle is started, the air solenoid valve E is kept normally open, the whole vehicle brake air storage tank 4 provides an air source, and compressed air continuously ventilates to the exhaust pipeline through the pressure limiting valve 5, the oil-gas separator 3, the air solenoid valve E, the mixing cavity D and the urea pipe 9 to the urea nozzle 2. Air has the following functions: bringing the urea aqueous solution into an exhaust system, assisting the atomization of the urea aqueous solution, preventing the nozzle from being blocked, and cooling the nozzle.
Before the work (and after the work), the diaphragm pump A is opened to the return valve F and is out of work, and compressed air passes through mixing chamber D, metering valve C, urea filter core B, return valve F, urea case filter core H to urea case G, empties the urea aqueous solution that probably remains in the passageway to urea case G in, avoids urea crystallization, jam to appear in the passageway that urea case area urea pump assembly 10 is inside, can practice thrift urea aqueous solution simultaneously.
When the inlet temperature of the SCR aftertreatment assembly 1 exceeds a certain temperature, the urea injection system works normally. During operation, the reflux valve F closes the diaphragm pump A to operate, urea is extracted through a passage connected with the urea box G and the urea box filter element H, and the urea reaches the urea metering valve C through the diaphragm pump A and the urea filter element B. The urea metering valve C sprays urea aqueous solution into the mixing cavity D for the first atomization, and the urea aqueous solution is fully mixed with compressed air in the mixing cavity D. The atomized gas reaches the urea nozzle 2 through the urea pipe 9, is sprayed into the SCR post-treatment assembly 1 for secondary atomization, and decomposes and reduces NOx under the action of the SCR post-treatment assembly 1.
Under normal conditions, the air pressure of the whole vehicle brake air storage tank 4 is greater than the opening pressure of the pressure limiting valve 5 and is in a normally open state. When the vehicle is in the limit working condition of long downhill and frequent braking, the braking air consumption is overlarge, so that the air pressure is lower than the opening pressure of the pressure limiting valve 5, the pressure limiting valve is closed, and the urea injection system stops working. At the moment, the brake air is preferentially ensured, and the brake safety is ensured. Meanwhile, under the working condition, the engine is in idle speed for a long time, the inlet temperature of the SCR post-treatment assembly 1 does not reach a specific temperature, and the urea system does not need to spray urea and can meet the emission requirement only through the action of the SCR post-treatment assembly 1.
The above mentioned is only the embodiment of the present invention, not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings or the direct or indirect application in the related technical field are included in the patent protection scope of the present invention.
Claims (2)
1. A novel air-assisted urea injection system is characterized in that: including SCR aftertreatment assembly (1), urea nozzle (2), oil and gas separator (3), whole car braking gas holder (4), pressure limiting valve (5), urea pipe (9), urea case area urea pump assembly (10), whole car braking gas holder (4), pressure limiting valve (5), oil and gas separator (3) and urea case area urea pump assembly (10) loop through first trachea (6), second trachea (7) and third trachea (8) and are connected, urea case area urea pump assembly (10) through urea pipe (9) with urea nozzle (2) are connected, urea nozzle (2) set up in the upper reaches of SCR aftertreatment assembly (1).
2. The novel gas-assisted urea injection system of claim 1, further comprising: the urea box with urea pump assembly (10) comprises a diaphragm pump (A), a urea filter element (B), a urea metering valve (C), a mixing cavity (D), an air electromagnetic valve (E), a reflux valve (F), a urea box (G) and a urea box filter element (H), one end of the air electromagnetic valve (E) is connected with the oil-gas separator (3) through a third air pipe (8), the other end of the air electromagnetic valve (E) is connected with one end of the mixing cavity (D), and the other end of the mixing cavity (D) is connected with the urea nozzle (2) through a urea pipe (9); mixing chamber (D), urea metering valve (C), urea filter core (B), reflux valve (F), urea case filter core (H) and urea case (G) loop through the tube coupling, diaphragm pump (A) set up in between urea filter core (B) and urea case filter core (H) with reflux valve (F) is parallelly connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021364257.2U CN212535820U (en) | 2020-07-13 | 2020-07-13 | Novel air-assisted urea injection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021364257.2U CN212535820U (en) | 2020-07-13 | 2020-07-13 | Novel air-assisted urea injection system |
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| CN212535820U true CN212535820U (en) | 2021-02-12 |
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| CN202021364257.2U Active CN212535820U (en) | 2020-07-13 | 2020-07-13 | Novel air-assisted urea injection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114215629A (en) * | 2021-12-02 | 2022-03-22 | 江铃汽车股份有限公司 | Emptying method of electronic control type urea injection system |
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2020
- 2020-07-13 CN CN202021364257.2U patent/CN212535820U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114215629A (en) * | 2021-12-02 | 2022-03-22 | 江铃汽车股份有限公司 | Emptying method of electronic control type urea injection system |
| CN114215629B (en) * | 2021-12-02 | 2023-01-31 | 江铃汽车股份有限公司 | Emptying method of electronic control type urea injection system |
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