CN215633255U - Urea injection device adopting gear pump to extract solution - Google Patents
Urea injection device adopting gear pump to extract solution Download PDFInfo
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- CN215633255U CN215633255U CN202121474178.1U CN202121474178U CN215633255U CN 215633255 U CN215633255 U CN 215633255U CN 202121474178 U CN202121474178 U CN 202121474178U CN 215633255 U CN215633255 U CN 215633255U
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- urea
- gear pump
- solution
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- nozzle
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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 discloses a urea injection device for extracting solution by adopting a gear pump, wherein the gear pump is connected with a urea box through a liquid inlet pipeline, the gear pump switches the rotation direction through current control to realize extraction and reverse pumping of the urea solution, a urea nozzle is connected with the gear pump through a liquid conveying pipeline, a DCU controller is connected with the gear pump, and a pressure sensor is arranged on the liquid conveying pipeline. The utility model effectively improves the precision of urea solution quantitative injection, the precision can reach mg level, and the gear pump responds quickly by controlling the current without delay.
Description
Technical Field
The utility model relates to the field of tail gas aftertreatment, wherein vehicle types such as light and heavy trucks, pick-ups and school buses meet the national sixth-stage emission standard. More specifically, the present invention relates to a urea injection device that pumps a solution using a gear pump.
Background
During operation of internal combustion engines, such as diesel engines, in motor vehicles, Nitrogen Oxides (NO) are frequently formed with an excess of oxygenx) And thus may cause environmental pollution. To meet increasingly stringent emissions requirementsTo reduce the emission of nitrogen oxides, it is necessary to reduce NO in the exhaust gasxReduction to nitrogen and water is usually achieved by injecting an aqueous urea solution as a reductant into the exhaust gas before it enters the catalyst to effect the reduction of NOxThe urea supply pump plays a fundamental role in the whole process and needs to adapt to various extreme conditions, such as the working capacity under the conditions of extremely cold regions and low temperature.
SUMMERY OF THE UTILITY MODEL
To achieve these objects and other advantages and in accordance with the purpose of the utility model, a urea injection apparatus for pumping a solution using a gear pump is provided, the gear pump is connected to a urea tank through a liquid inlet pipe, the gear pump switches a rotation direction through current control to achieve extraction and reverse pumping of the urea solution, a urea nozzle is connected to the gear pump through a liquid delivery pipe, a DCU controller is connected to the gear pump, and a pressure sensor is provided on the liquid delivery pipe.
Preferably, the urea nozzle is an electrically controlled nozzle.
Preferably, the infusion pipeline is connected with a return pipeline with a valve, and the other end of the return pipeline is communicated with the urea tank.
Preferably, at least one filter element is arranged on the liquid inlet pipeline.
Preferably, still include the shell, gear pump and pressure sensor set up in the shell, the shell sets up in the urea case, just the urea nozzle is located shell and urea case outsidely.
Preferably, still include the shell, gear pump and pressure sensor set up in the shell, the shell sets up outside the urea case, just the urea nozzle is located outside the shell.
The utility model at least comprises the following beneficial effects:
1. the gear pump and the DCU control end are adopted to realize the accurate control of the urea solution pressure, the urea solution quantitative injection precision is effectively improved, the precision can reach the mg level, the gear pump responds quickly by controlling the current, and no delay exists.
2. The gear rotation direction in the gear pump is controlled by the positive and negative of the current of the input end, the gear rotation direction can be easily switched, the gear rotates in the reverse direction, the gear pump has a suck-back function, residual solution in the pipeline after the suck-back injection is stopped can be pumped out and discharged back to the urea box, and the problems that the residual solution in the injection system forms urea crystals in the pipeline, the gear pump is abraded due to the crystals, a nozzle is blocked and the like can be avoided. Under extremely cold conditions, when the temperature is lower than-11 ℃, the residual solution is frozen in the pipeline, when the system is started at low temperature, ice can block the urea conveying pipeline, and the frozen urea solution expands in volume, so that the risk of cracking the pipeline is caused, and the system breaks down; however, after the engine is flamed out, the gear pump with the back suction function controls the gear to reversely rotate, the gear pump is switched to the back suction state, the residual solution in the pipeline can be quickly pumped out, the risk of crystallization and icing of the urea solution is eliminated, and the risk resistance of the injection system is improved.
Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model.
Drawings
FIG. 1 is a schematic view of a urea injection device according to embodiment 1;
FIG. 2 is a schematic view of a urea injection device according to embodiment 2.
Description of reference numerals: 1. urea case, 2, pressure sensor, 3, gear pump, 4, filter core, 5, urea nozzle, 6, backflow pipeline, 7, liquid inlet pipe way, 8, infusion pipeline.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the utility model with reference to the description.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example 1
As urea injection apparatus shown in figure 1, the gear pump passes through inlet channel 7 and is connected with urea case 1, and urea case 1 is used for splendid attire urea solution, and urea nozzle 5 passes through infusion pipeline 8 and is connected with gear pump 3, and the DCU controller is connected with gear pump 3, be provided with pressure sensor 2 on the infusion pipeline. A housing, gear pump 3 and pressure sensor 2 set up in the housing, the housing sets up in urea case 1, just urea nozzle 5 is located outside housing and urea case 1. The urea nozzle 5 is an electrically controlled nozzle.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: the infusion pipeline 8 is connected with a return pipeline 6 with a valve, and the other end of the return pipeline 6 is communicated with the urea box 1.
The rotation direction of the gear in the gear pump 3 is controlled by the positive and negative of the current of the input end, the switching of the rotation direction of the gear can be easily realized, the positive and negative rotation of the gear can make the gear pump 3 have the suck-back function, the residual solution in the pipeline after the spray stop can be sucked back, and the residual solution is evacuated and discharged back to the urea box 1, so that the problems that the residual solution in the spray system forms urea crystals in the pipeline, the abrasion of the gear pump 3 can be caused by the crystals, the nozzle is blocked and the like can be avoided; secondly, under the extremely cold condition, when the temperature is lower than minus 11 ℃, the residual solution is frozen in the pipeline, when the system is started at low temperature, ice can block the urea conveying pipeline, and the frozen urea solution expands in volume, so that the risk of cracking the pipeline is caused, and the system is in failure; however, after the engine is shut down, the gear pump 3 with the back suction function controls the gear to rotate reversely, the gear pump 3 is switched to the back suction function, residual solution in the pipeline can be evacuated rapidly, the risk of crystallization and icing of the urea solution is eliminated, and the risk resistance of the injection system is improved.
The back suction function that gear pump 3 had has realized the function of two-way controllable transport urea solution of single pump, and other parts such as other pumps or diverter valves of not realizing the back suction function through the second, effectively shortened the time of starting the back suction function, reduced urea injection apparatus's part quantity and volume size, simplified urea injection apparatus's structure, effectively reduced urea injection apparatus's fault rate, improved the reliability of device, also reduced urea injection apparatus's manufacturing cost and production cycle.
And the liquid inlet pipeline 7 is provided with a filter element 4. The gear pump 3 absorbs the urea solution filtered by the filter element 4 from the urea box 1, and the filter element 4 is used for filtering particulate matters in the urea solution to protect the system.
Example 2
As shown in figure 2, a urea injection apparatus adopting a gear pump to extract solution, the gear pump is connected with a urea box 1 through a liquid inlet pipeline 7, the urea box 1 is used for containing urea solution, a urea nozzle 5 is connected with the gear pump 3 through a liquid inlet pipeline 8, a DCU controller is connected with the gear pump 3, and a pressure sensor 2 is arranged on the liquid inlet pipeline. A housing, gear pump 3 and pressure sensor 2 set up in the housing, the housing sets up outside urea case 1, just urea nozzle 5 is located outside the housing. The urea nozzle 5 is an electrically controlled nozzle.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: the infusion pipeline 8 is connected with a return pipeline 6 with a valve, and the other end of the return pipeline 6 is communicated with the urea box 1. The rotation direction of the gear in the gear pump 3 is controlled by the positive and negative of the current of the input end, the switching of the rotation direction of the gear can be easily realized, the positive and negative rotation of the gear can make the gear pump 3 have the suck-back function, the residual solution in the pipeline after the spray stop can be sucked back, and the residual solution is evacuated and discharged back to the urea box 1, so that the problems that the residual solution in the spray system forms urea crystals in the pipeline, the abrasion of the gear pump 3 can be caused by the crystals, the nozzle is blocked and the like can be avoided; secondly, under the extremely cold condition, when the temperature is lower than minus 11 ℃, the residual solution is frozen in the pipeline, when the system is started at low temperature, ice can block the urea conveying pipeline, and the frozen urea solution expands in volume, so that the risk of cracking the pipeline is caused, and the system is in failure; however, after the engine is shut down, the gear pump 3 with the back suction function controls the gear to rotate reversely, the gear pump 3 is switched to the back suction function, residual solution in the pipeline can be evacuated rapidly, the risk of crystallization and icing of the urea solution is eliminated, and the risk resistance of the injection system is improved.
The back suction function that gear pump 3 had has realized the function of two-way controllable transport urea solution of single pump, and other parts such as other pumps or diverter valves of not realizing the back suction function through the second, effectively shortened the time of starting the back suction function, reduced urea injection apparatus's part quantity and volume size, simplified urea injection apparatus's structure, effectively reduced urea injection apparatus's fault rate, improved the reliability of device, also reduced urea injection apparatus's manufacturing cost and cycle.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: be provided with two filter cores 4 on the inlet channel 7, the filtration grade of two filter cores 4 is different, and the filter core 4 grade that is located urea case 1 is less than the filter core 4 grade that is located the supply pump. The gear pump 3 absorbs the urea solution filtered by the filter element 4 from the urea box 1, and the filter element 4 is used for filtering particulate matters in the urea solution to protect the system.
In the above technical scheme, adopt gear pump 3 as urea injection apparatus's feed pump, gear pump 3 absorbs the urea solution through filter core 4 filterable from urea case 1, filter core 4 is used for filtering particulate matter in the urea solution, play the guard action to the system, the urea solution through pump pressurization is carried to pressure sensor 2 along the pipeline, pressure sensor 2 detects solution pressure, feed back to DCU control end, DCU is according to the opening of relevant parameter control nozzle such as solution pressure, the nozzle sprays quantitative urea solution in the tail gas, participate in the tail gas purification, and unnecessary solution returns to urea case 1 through pipe-line system. The gear pump 3 pressurizes the urea solution through rotation of the gears, and compared with other types of pumps such as a diaphragm pump and the like, the gear pump is simple in structure and high in reliability. The DCU controls the current input to the gear pump 3 to realize the accurate control of the rotating speed of the gear pump 3, so that the accurate control of the pressure of the urea solution is realized, the accuracy of the urea solution quantitative injection is effectively improved, the accuracy can reach the mg level, and the gear pump 3 is enabled to respond quickly by a method for controlling the current, and no delay exists.
The working principle of the device is as follows:
an engine ECU sends a signal to a DCU controller in a urea supply pump, the DCU controller controls a gear pump 3 to be started to provide suction for urea solution in a urea tank 1, the urea solution in the urea tank 1 enters the supply pump, the urea solution is conveyed to pass through a pressure sensor 2, one end of the urea solution is sprayed back to the urea tank 1 through a return pipeline 6, the other end of the urea solution flows into an electric control nozzle through a joint of a liquid conveying pipeline 8, the pressure in the pipeline is stable at the moment, and when the nozzle receives a quantitative urea flow electric signal, the nozzle is opened to a corresponding opening degree to spray the specified urea solution flow; after the engine is flamed out, the DCU controller controls the input current of the gear pump 3, the gear pump 3 is rapidly switched to the suck-back function, and the residual urea solution in the supply pump is pumped out.
While embodiments of the utility model have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the utility model may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the utility model is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.
Claims (6)
1. The utility model provides an adopt urea injection apparatus of gear pump extraction solution, its characterized in that, the gear pump passes through the inlet channel and is connected with the urea case, and the gear pump passes through current control and switches the direction of rotation, and the urea nozzle passes through the infusion pipeline to be connected with the gear pump, and the DCU controller is connected with the gear pump, be provided with pressure sensor on the infusion pipeline.
2. The urea injection apparatus with a gear pump for pumping a solution according to claim 1, wherein the urea injection nozzle is an electronically controlled nozzle.
3. The urea injection apparatus with a gear pump for extracting solution as claimed in claim 1, wherein a return line having a valve is connected to the feeding line, and the other end of the return line is connected to the urea tank.
4. The urea injection apparatus with gear pump for pumping solution of claim 1, wherein said inlet conduit is provided with at least one filter element.
5. The urea injection apparatus using a gear pump for pumping a solution according to any one of claims 1 to 4, further comprising a housing, wherein the gear pump and the pressure sensor are disposed in the housing, the housing is disposed in the urea tank, and the urea nozzle is disposed outside the housing and the urea tank.
6. The urea injection apparatus using a gear pump to pump solution according to claims 1-4, further comprising a housing, wherein the gear pump and the pressure sensor are disposed inside the housing, the housing is disposed outside the urea tank, and the urea nozzle is disposed outside the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121474178.1U CN215633255U (en) | 2021-06-30 | 2021-06-30 | Urea injection device adopting gear pump to extract solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121474178.1U CN215633255U (en) | 2021-06-30 | 2021-06-30 | Urea injection device adopting gear pump to extract solution |
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| Publication Number | Publication Date |
|---|---|
| CN215633255U true CN215633255U (en) | 2022-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121474178.1U Active CN215633255U (en) | 2021-06-30 | 2021-06-30 | Urea injection device adopting gear pump to extract solution |
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| CN (1) | CN215633255U (en) |
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2021
- 2021-06-30 CN CN202121474178.1U patent/CN215633255U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Urea injection device using gear pump to extract solution Effective date of registration: 20230809 Granted publication date: 20220125 Pledgee: Guanggu Branch of Wuhan Rural Commercial Bank Co.,Ltd. Pledgor: LOTUSFAIRY POWER TECHNOLOGIES Corp. Registration number: Y2023420000327 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |