CN109139202B - Urea pump and SCR injection system - Google Patents
Urea pump and SCR injection system Download PDFInfo
- Publication number
- CN109139202B CN109139202B CN201811061871.9A CN201811061871A CN109139202B CN 109139202 B CN109139202 B CN 109139202B CN 201811061871 A CN201811061871 A CN 201811061871A CN 109139202 B CN109139202 B CN 109139202B
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- Prior art keywords
- urea
- liquid
- metering
- cavity
- urea pump
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—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 constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
- F01N2610/1426—Filtration means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1433—Pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- 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
The invention discloses a urea pump and an SCR injection system, wherein the urea pump comprises: the urea box, a liquid absorption cavity communicated with the urea box through a liquid inlet pipe, and a metering cavity communicated with the liquid absorption cavity; wherein the liquid suction chamber is higher than the metering chamber. According to the urea pump disclosed by the invention, the liquid absorption cavity is arranged, so that urea firstly enters the liquid absorption cavity from the urea box through the liquid inlet pipe and then enters the metering cavity through the liquid absorption cavity, and gas carried by the urea is accumulated in the liquid absorption cavity because the liquid absorption cavity is higher than the metering cavity, so that the gas in the metering cavity is reduced or even eliminated, the metering precision of the urea is prevented from being reduced due to the gas absorption, and the emission effect is improved.
Description
Technical Field
The invention relates to the technical field of tail gas aftertreatment, in particular to a urea pump and an SCR (selective catalytic reduction) injection system.
Background
In order to reduce the environmental pollution caused by the exhaust gas discharged by the engine, a set of device for treating pollutants such as nitrogen oxides and the like is connected to the exhaust pipe of the engine, and the treatment of the pollutants in the exhaust gas is mainly realized by an SCR (selective catalytic reduction) technology, a DOC (catalyst controlled oxidation) technology and the like. The SCR injection system is the key in the SCR technology, and the SCR injection system comprises a controller, a urea pump, a nozzle, a connecting pipeline and other components, and mainly realizes the functions of accurately metering and atomizing urea solution.
Whether the SCR injection system is operating properly directly affects the conversion efficiency of exhaust pollutants and the problem of urea crystallization. At present, in an air-assisted system matched with an SCR injection system, sucked urea has bubbles, and gas exists in a metering cavity, so that the metering precision of the urea is poor, the emission exceeds the standard, and the emission effect is poor.
In addition, impurities can easily enter the liquid inlet pipe, so that the phenomenon of pollution and clamping stagnation of the check valve and the diaphragm in the metering cavity is caused, the SCR box is crystallized, the vehicle torque limitation can be caused, and the normal use of a user is influenced.
Disclosure of Invention
The invention aims to provide a urea pump, which is used for avoiding the reduction of the metering precision of urea due to gas suction and ensuring the emission effect. It is another object of the present invention to provide an SCR injection system having the above-described urea pump.
In order to achieve the above purpose, the invention provides the following technical scheme:
a urea pump comprising: the urea box, a liquid absorption cavity communicated with the urea box through a liquid inlet pipe, and a metering cavity communicated with the liquid absorption cavity; wherein the liquid suction cavity is higher than the metering cavity.
Preferably, the volume of the aspirating chamber is greater than the volume of the metering chamber.
Preferably, the liquid suction cavity is provided with a liquid suction return port, and the urea pump further comprises: and the first liquid return pipe is communicated with the liquid suction and return port and the urea box.
Preferably, a first check valve is connected in series to the first liquid return pipe, and the first check valve is communicated with the urea tank from the liquid suction and return port.
Preferably, the metering cavity is communicated with the first liquid return pipe through a liquid conveying pipe, a second one-way valve is connected to the liquid conveying pipe in series, and the second one-way valve is communicated with the metering cavity from the communication position of the liquid conveying pipe and the first liquid return pipe.
Preferably, a third one-way valve is connected in series with the first liquid return pipe;
the communication position of the infusion tube and the first liquid return tube is positioned at the upstream of the third one-way valve along the liquid return direction of the first liquid return tube; and the third one-way valve is communicated with the urea box from the communication position of the infusion tube and the first liquid return tube.
Preferably, the metering chamber is an electromagnetic diaphragm metering pump structure.
Preferably, the urea pump further comprises a filtering device capable of filtering urea, the filtering device being located upstream of the metering chamber in the direction of feed of the feed pipe.
Preferably, the filter device is arranged at the outlet liquid of the liquid suction cavity.
Preferably, the filtering device is a filter screen.
Based on the urea pump, the invention further provides an SCR injection system, which comprises the urea pump, wherein the urea pump is any one of the urea pumps.
According to the urea pump provided by the invention, the liquid absorption cavity is arranged, so that urea firstly enters the liquid absorption cavity from the urea box through the liquid inlet pipe and then enters the metering cavity through the liquid absorption cavity, and gas carried by the urea is accumulated in the liquid absorption cavity because the liquid absorption cavity is higher than the metering cavity, so that the gas in the metering cavity is reduced or even eliminated, the metering precision of the urea is prevented from being reduced due to the gas absorption, and the emission effect is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic flow chart of a urea pump according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a urea pump according to an embodiment of the present invention includes: urea case 1, through the measurement chamber 8 of feed liquor pipe 2 with urea case 1 intercommunication, its characterized in that, urea pump still including the imbibition chamber 5 of concatenating on feed liquor pipe 2, and imbibition chamber 5 is higher than measurement chamber 8.
According to the urea pump provided by the embodiment of the invention, the liquid suction cavity 5 is arranged, so that urea firstly enters the liquid suction cavity 5 from the urea box 1 through the liquid inlet pipe 2 and then enters the metering cavity 8 through the liquid suction cavity 5, and gas carried by the urea is accumulated in the liquid suction cavity 5 because the liquid suction cavity 5 is higher than the metering cavity 8, so that the gas in the metering cavity 8 is reduced or even eliminated, the metering precision of the urea is prevented from being reduced due to the gas suction, and the emission effect is improved.
In the above embodiment, the height difference between the liquid suction chamber 5 and the metering chamber 8 can be designed according to actual needs, which is not limited in the embodiment of the present invention.
In order to ensure that there is sufficient urea in the metering chamber 8, the volume of the aspiration chamber 5 is greater than the volume of the metering chamber 8.
Specifically, the volume of the liquid suction chamber 5 is not less than 1.3 times the volume of the measurement chamber 8, and further, the volume of the liquid suction chamber 5 is twice the volume of the measurement chamber 8. Of course, the volume of the aspiration chamber 5 may be selected to be other multiples of the volume of the metering chamber 8, and is not limited thereto.
Because the volume of the liquid suction cavity 5 is larger than that of the metering cavity 8, the urea amount in the metering cavity 8 is easy to be excessive, namely, the urea amount in the metering cavity 8 is larger than the required amount. In order to avoid excessive urea entering the mixing chamber 14, the liquid suction chamber 5 is provided with a liquid suction return port, and the urea pump further comprises: and a first liquid return pipe 6 for communicating the liquid suction and return port with the urea box 1.
In order to avoid the urea backflow, the first backflow pipe is connected in series with a first one-way valve 4, and the first one-way valve 4 is communicated with the urea tank 1 from a liquid suction and backflow port.
Preferably, the measuring chamber 8 is communicated with the first liquid return pipe 6 through a liquid conveying pipe 10, a second one-way valve 9 is connected in series to the liquid conveying pipe 10, and the second one-way valve 9 is communicated with the measuring chamber 8 from the communication position of the liquid conveying pipe 10 and the first liquid return pipe 6.
It will be appreciated that the connection of the infusion tube 10 to the first return tube 6 is downstream of the first non return valve 4 in the return direction of the first return tube 6.
Further, a third check valve 11 is connected in series with the first liquid return pipe 6; wherein, along the liquid return direction of the first liquid return pipe 6, the communication position of the liquid conveying pipe 10 and the first liquid return pipe 6 is positioned at the upstream of the third one-way valve 11; and the third check valve 11 is communicated with the urea box 1 from the communication part of the infusion tube 10 and the first liquid return tube 6.
In order to facilitate liquid return and liquid discharge, a liquid suction port in the liquid suction cavity 5, which is communicated with the urea tank 1, is lower than a liquid outlet in the liquid suction cavity 5, which is communicated with the metering cavity 8, and the liquid outlet is lower than a liquid suction liquid return port.
For avoiding the feed liquor backward flow, have concatenated fourth check valve 3 on the above-mentioned feed liquor pipe 2, and fourth check valve 3 is located the upper reaches of imbibition chamber 5, and fourth check valve 3 switches on to imbibition chamber 5 from urea case 1.
In the urea pump, the metering cavity 8 is preferably selected to be an electromagnetic diaphragm metering pump structure, so that the structure is simplified and the control is convenient. Specifically, under the drive of the electromagnet 7, urea enters the liquid inlet pipe 2 from the urea box 1, then enters the liquid absorption cavity 5 through the liquid inlet pipe 2, then enters the metering cavity 8 through the liquid absorption cavity 5, and then enters the mixing cavity 14 through the metering cavity 8 to be mixed with compressed air, and finally is sprayed out through the spraying pipe 13.
It should be noted that the compressed air enters the mixing chamber 14 through a gas transmission pipeline, and a pressure stabilizing valve 12 is connected in series to the gas transmission pipeline in order to ensure stable pressure.
Of course, the metering chamber 8 may be selected to have other structures, such as a mechanical diaphragm metering pump structure, a hydraulic diaphragm metering pump structure, or the like, and is not limited to the above embodiment.
In order to further optimize the above technical solution, the above urea pump further comprises a filtering device capable of filtering urea, the filtering device being located upstream of the metering chamber 8 along the liquid inlet direction of the liquid inlet pipe 2.
In the structure, impurities carried by the urea are filtered by the filtering device, so that the cleanness of the urea entering the metering cavity 8 is improved, and the probability of the impurities entering the metering cavity 8 is reduced, so that the probability of pollution and clamping stagnation of a check valve and a diaphragm in the metering cavity 8 is reduced, the metering accuracy of the urea in the metering cavity 8 is ensured, and the precision and the reliability of the urea pump are ensured; the crystallization probability of the SCR box and the torsion limiting probability of the vehicle are reduced, the influence on normal use of a user is reduced, and the reliability of the whole urea pump is improved.
The position of the filtering device can be designed according to actual requirements. Preferably, the above-mentioned filtering means are arranged at the outlet liquid of the suction chamber 5. Of course, the filtering device can be arranged on the liquid inlet pipe 2, and is not limited to this.
The specific structure and type of the filtering device are selected according to actual needs. In order to reduce the cost and simplify the structure, the filtering device is preferably selected as a filtering net.
Based on the urea pump provided by the above embodiment, an embodiment of the present invention further provides an SCR injection system, which includes the urea pump, and the urea pump is the urea pump described in the above embodiment.
Since the urea pump has the technical effects and the SCR injection system includes the urea pump, the SCR injection system also has corresponding technical effects, which are not described herein again.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A urea pump, comprising: the device comprises a urea box (1), a liquid suction cavity (5) communicated with the urea box (1) through a liquid inlet pipe (2), and a metering cavity (8) communicated with the liquid suction cavity (5); wherein the aspirating chamber (5) is higher than the metering chamber (8);
inhale liquid chamber (5) and be provided with imbibition liquid return port, the urea pump still includes: a first liquid return pipe (6) for communicating the liquid suction and return port with the urea tank (1);
first check valve (4) have concatenated on first liquid return pipe (6), and first check valve (4) from imbibition liquid return mouth to urea case (1) switch on.
2. Urea pump according to claim 1, characterized in that the volume of the suction chamber (5) is larger than the volume of the metering chamber (8).
3. The urea pump of claim 1,
the metering cavity (8) is communicated with the first liquid return pipe (6) through a liquid conveying pipe (10), a second one-way valve (9) is connected to the liquid conveying pipe (10) in series, and the second one-way valve (9) is communicated with the metering cavity (8) from the communication position of the liquid conveying pipe (10) and the first liquid return pipe (6).
4. A urea pump according to claim 3, characterized in that a third non-return valve (11) is connected in series with the first return line (6);
wherein the communication position of the infusion tube (10) and the first liquid return tube (6) is positioned at the upstream of the third one-way valve (11) along the liquid return direction of the first liquid return tube (6); and the third one-way valve (11) is communicated with the urea box (1) from the communication position of the infusion tube (10) and the first liquid return tube (6).
5. Urea pump according to claim 1, characterized in that the metering chamber (8) is of the electromagnetic diaphragm metering pump construction.
6. Urea pump according to any one of claims 1-5, characterized in that it also comprises a filtering device capable of filtering urea, which is located upstream of the metering chamber (8) in the direction of feed of the feed pipe (2).
7. Urea pump according to claim 6, characterized in that the filter means are arranged at the outlet of the suction chamber (5).
8. The urea pump of claim 6, wherein the filter device is a filter screen.
9. An SCR injection system comprising a urea pump, characterized in that the urea pump is a urea pump according to any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811061871.9A CN109139202B (en) | 2018-09-12 | 2018-09-12 | Urea pump and SCR injection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811061871.9A CN109139202B (en) | 2018-09-12 | 2018-09-12 | Urea pump and SCR injection system |
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| Publication Number | Publication Date |
|---|---|
| CN109139202A CN109139202A (en) | 2019-01-04 |
| CN109139202B true CN109139202B (en) | 2020-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811061871.9A Active CN109139202B (en) | 2018-09-12 | 2018-09-12 | Urea pump and SCR injection system |
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| Country | Link |
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| CN (1) | CN109139202B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118188116A (en) * | 2019-09-03 | 2024-06-14 | 武汉洛特福动力技术有限公司 | Urea injection system for diesel engine aftertreatment system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205559025U (en) * | 2016-03-15 | 2016-09-07 | 茵卡排放控制系统（江苏）有限公司 | A differential urea pump for SCR exhaust aftertreatment |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200989269Y (en) * | 2005-01-26 | 2007-12-12 | 浙江飞亚电子有限公司 | Engine fuel tank |
| CN2818842Y (en) * | 2005-09-27 | 2006-09-20 | 罗献尧 | Electromagnetic diaphragm metering pump |
| DE102011003912B4 (en) * | 2011-02-10 | 2023-08-03 | Robert Bosch Gmbh | Device and method for metering a liquid into the exhaust system of an internal combustion engine |
| CN103133097B (en) * | 2013-02-26 | 2014-10-01 | 西安秦泰汽车配件有限公司 | Outside gas-liquid mixing injection system and method for exhaust after-treatment of diesel engines |
| CN204386852U (en) * | 2014-12-26 | 2015-06-10 | 陈庆东 | A kind of urea pump control system |
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2018
- 2018-09-12 CN CN201811061871.9A patent/CN109139202B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205559025U (en) * | 2016-03-15 | 2016-09-07 | 茵卡排放控制系统（江苏）有限公司 | A differential urea pump for SCR exhaust aftertreatment |
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| CN109139202A (en) | 2019-01-04 |
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