CN215633256U - Pipeline system applied to urea injection device - Google Patents
Pipeline system applied to urea injection device Download PDFInfo
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- CN215633256U CN215633256U CN202121478159.6U CN202121478159U CN215633256U CN 215633256 U CN215633256 U CN 215633256U CN 202121478159 U CN202121478159 U CN 202121478159U CN 215633256 U CN215633256 U CN 215633256U
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Abstract
The utility model discloses a pipeline system applied to a urea injection device, which is arranged in a urea box, wherein urea solution is filled in the urea box, and the pipeline system is characterized by comprising a pump body and a control unit, wherein the pump body is provided with a liquid inlet end and a liquid outlet end, the liquid inlet end is communicated with the urea box through a pipeline and used for absorbing the urea solution in the urea box, the liquid outlet end is respectively communicated with a first liquid outlet channel and a second liquid outlet channel, one end of the first liquid outlet channel extends out of the urea box, a nozzle is arranged, and the second liquid outlet channel is communicated with the urea box and used for enabling the urea solution to flow back into the urea box; the second liquid outlet channel is provided with a filter element A, a one-way valve and an overflow valve; the opening degree of the nozzle is adjustable, and the control unit is electrically connected with the nozzle and used for controlling the opening degree of the nozzle. The urea spraying precision is improved, the size of a conveying pipeline and the number of parts are reduced, and the later maintenance cost and difficulty are reduced.
Description
Technical Field
The utility model relates to the field of pipeline systems applied to urea injection devices. More particularly, the present invention relates to a piping system for a urea injection device that can achieve a fixed-quantity injection.
Background
When an internal combustion engine of an automobile, such as a diesel engine, is operated, nitrogen oxides (NOx) are generated with an excessive amount of oxygen in many cases, thereby causing environmental pollution. In order to meet increasingly stringent emission requirements and reduce emission of nitrogen oxides, NOx in exhaust gas needs to be reduced into nitrogen and water, usually, before the exhaust gas enters a catalyst, urea aqueous solution is injected into the exhaust gas as a reducing agent to reduce the NOx, and the operation is specifically realized by pumping the urea solution into the exhaust gas of an exhaust pipeline after the urea solution is absorbed from a urea tank by a urea supply pump, wherein the urea pump plays an important role in the whole process, but the urea pump simply injects all the urea solution pumped into the urea pump, and cannot realize accurate quantitative injection.
SUMMERY OF THE UTILITY MODEL
To achieve these objects and other advantages and in accordance with the purpose of the utility model, a piping system for a urea injection apparatus is provided, which is installed in a urea tank containing a urea solution, and includes a pump body having an inlet end and an outlet end, the inlet end being connected to the urea tank through a pipe for sucking the urea solution in the urea tank, and a control unit,
the liquid outlet end is respectively communicated with a first liquid outlet channel and a second liquid outlet channel, one end of the first liquid outlet channel extends out of the urea box and is provided with a nozzle, and the second liquid outlet channel is communicated with the urea box and is used for enabling the urea solution to flow back into the urea box;
the opening degree of the nozzle is adjustable, and the control unit is electrically connected with the nozzle and used for controlling the opening degree of the nozzle.
According to a preferred embodiment of the present invention, in the piping system for urea injection device,
and a pressure sensor is arranged on the first liquid outlet channel.
According to a preferred embodiment of the present invention, in the piping system for urea injection device,
the nozzle is an electrically controlled nozzle.
According to a preferred embodiment of the present invention, in the piping system for urea injection device,
the control unit is also electrically connected with the pump body and controls the rotating speed, the input current value and the current direction of the pump body.
According to a preferred embodiment of the present invention, in the piping system for urea injection device,
and the second liquid outlet channel is provided with a filter element A, a one-way valve and an overflow valve.
According to a preferred embodiment of the present invention, in the piping system for urea injection device,
and a filter element B is arranged on the pipeline connected with the liquid inlet end.
According to a preferred embodiment of the present invention, in the piping system for urea injection device,
the pump body, the control unit, the pressure sensor, the filter element A, the one-way valve and the overflow valve are all arranged in the shell.
According to a preferred embodiment of the present invention, in the piping system for urea injection device,
the pressure sensor is electrically connected to the control unit.
The utility model at least comprises the following beneficial effects:
1. in the urea injection device, not all the solution pumped by the pump is injected into the tail gas to participate in reaction, and part of the urea solution needs to be discharged back to the urea tank; the pump absorbs the filterable urea solution of filter core from the urea case, in order to avoid impurity to get into injection system and lead to the pump wearing and tearing in the solution, the nozzle blocks up, the urea solution through pump pressurization is carried to pressure sensor along the pipeline, pressure sensor detects solution pressure, feedback to the control unit, the control unit controls the nozzle according to relevant parameters such as solution pressure and starts, the nozzle sprays quantitative urea solution to the tail gas in, participate in tail gas purification, and remaining solution is behind filter core and check valve, arrange back to the urea case through the regulation of overflow valve at last, the effect at this place of filter core A is for filtering urea solution, the protection overflow valve is not blockked up by the particulate matter, the overflow valve has played the effect of stationary flow pressurize here, discharge unnecessary solution, make the solution pressure in the pipeline remain stable, thereby guarantee the precision of urea injection.
2. After the engine is shut down, the system stops spraying the urea solution, but the solution remained in the system pipeline needs to be sucked back and discharged out of the system pipeline in time, so that the unfavorable phenomena of precipitation and crystallization of the urea solution or icing of the solution under an extremely cold condition are avoided, parts such as a nozzle, a pump gear and the like are broken down, and the reliability of the system is improved; after the back-pumping function is opened, residual solution in the urea solution in the pipeline is discharged back to the urea tank from the liquid inlet under the back-pumping action of the pump, but in the process, the solution in the urea tank cannot enter the device from the overflow valve end due to the directional passing function of the check valve, so that only residual urea solution in the pipeline is ensured, the situation that the solution is not fed from the overflow valve and is higher than the liquid level of the liquid outlet of the overflow valve in order to realize that the solution is not fed from the overflow valve is avoided, the size of a conveying pipeline is reduced, and the production cost and the maintenance difficulty are reduced.
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 structural view of a piping system applied to a urea injection device in the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the utility model by referring to the description text.
The following description is presented to disclose the utility model so as to enable any person skilled in the art to practice the utility model. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the utility model, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the utility model.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
As shown in fig. 1, a preferred embodiment of the present invention provides a pipeline system applied to a urea injection device, which is installed in a urea tank 1, wherein a urea solution is contained in the urea tank 1, the pipeline system includes a pump body 2 and a control unit, the pump body 2 has an inlet end and an outlet end, the inlet end is communicated with the urea tank 1 through a pipeline 3 for sucking the urea solution in the urea tank 1,
the liquid outlet end is respectively communicated with a first liquid outlet channel 4 and a second liquid outlet channel 5, one end of the first liquid outlet channel 4 extends out of the urea box 1 and is provided with a nozzle 6, and the second liquid outlet channel 5 is communicated with the urea box 1 and is used for enabling urea solution to flow back into the urea box 1;
the opening degree of the nozzle 6 is adjustable, and the control unit is electrically connected to the nozzle 6 and controls the opening degree of the nozzle 6. And a pressure sensor 7 is arranged on the first liquid outlet channel 4. And the second liquid outlet channel 5 is provided with a filter element A8, a one-way valve 9 and an overflow valve 10.
In the above embodiment, the control unit controls the pump body 2 (urea supply pump) to start, so as to provide suction for the urea solution in the urea tank, the urea solution in the urea tank enters the urea supply pump body 2, after the urea solution is conveyed through the pressure sensor 7, one end of the urea solution is sprayed back to the urea tank 1 through the pipeline, the other end of the urea solution flows into the nozzle 6 through the liquid outlet pipe joint, at this time, the pressure in the pipeline is stable, and when the nozzle 6 receives a quantitative urea flow electric signal, the nozzle 6 opens corresponding opening to spray the specified urea solution flow; after the engine is flamed out, the control unit controls the input current of the pump body 2, the pump body 2 is rapidly switched to a suck-back function, residual urea solution in the pump is supplied in an evacuated mode, and the pump body 2 is a gear pump.
In the urea injection device, not all the solution pumped by the pump is injected into the tail gas to participate in reaction, and part of the urea solution needs to be discharged back to the urea tank; the pump absorbs the filterable urea solution of filter core from the urea case, in order to avoid impurity to get into injection system and lead to the pump wearing and tearing in the solution, the nozzle blocks up, the urea solution through pump pressurization is carried to pressure sensor along the pipeline, pressure sensor detects solution pressure, feedback to the control unit, the control unit controls the nozzle according to relevant parameters such as solution pressure and starts, the nozzle sprays quantitative urea solution to the tail gas in, participate in tail gas purification, and remaining solution is behind filter core A8 and check valve 9, at last arrange back to the urea case through the regulation of overflow valve 10, the effect at this place of filter core A8 is for filtering urea solution, protection overflow valve 10 is not blockked by the particulate matter, overflow valve 10 has played the effect of stationary flow pressurize here, discharge unnecessary solution, make the solution pressure in the pipeline keep invariable, thereby improve the precision of urea injection. And the filter element A8 is arranged at the front end of the overflow valve 10 along the direction that the liquid outlet end is connected with the urea pump through a second liquid outlet channel 5.
In another embodiment, the nozzle 6 is an electrically controlled nozzle, and the opening degree thereof can be controlled by the control unit.
In another embodiment, the control unit is also electrically connected to the pump body 2 and controls its rotation speed and its input current value and current direction.
After the engine is shut down, the system stops spraying the urea solution, but the solution remained in the system pipeline needs to be sucked back and discharged out of the system pipeline in time, so that the unfavorable phenomena of precipitation and crystallization of the urea solution or icing of the solution under an extremely cold condition are avoided, parts such as a nozzle, a pump gear and the like are broken down, and the reliability of the system is improved; after the reverse pumping function is started, residual solution in the urea solution in the pipeline is discharged back to the urea tank from the liquid inlet under the reverse pumping action of the pump, but in the process, the solution in the urea tank cannot enter the device from the overflow valve 10 due to the directional passing function of the check valve, so that the residual urea solution in the pipeline is ensured only when the pump reversely pumps, the condition that the solution is higher than the liquid level of the liquid outlet of the overflow valve due to the fact that the solution cannot enter from the overflow valve is avoided, the size of a conveying pipeline is reduced, and the production cost and the maintenance difficulty are reduced. A check valve 9 is arranged between the overflow valve 10 and the filter element A8.
In another embodiment, a pipeline connected to the liquid inlet end is provided with a filter element B11, and urea is filtered and then pumped into the pump body 2, so that the influence of impurities on the pump body 2 is avoided.
In another embodiment, the pump body 2, the control unit, the pressure sensor 7, the filter element A8, the check valve 9 and the overflow valve 10 are all disposed in a casing 12, so that the whole facility is protected in the casing 12, forming a whole, and placed in the urea tank 1.
In another embodiment, the pressure sensor 7 is electrically connected to the control unit.
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 in various fields of endeavor to which the utility model pertains, and further modifications may readily be made by those skilled in the art, it being understood that the utility model is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (7)
1. A pipeline system applied to a urea injection device is arranged in a urea box, and urea solution is filled in the urea box, and the pipeline system is characterized by comprising a pump body and a control unit, wherein the pump body is provided with a liquid inlet end and a liquid outlet end, the liquid inlet end is communicated with the urea box through a pipeline and is used for absorbing the urea solution in the urea box,
the liquid outlet end is respectively communicated with a first liquid outlet channel and a second liquid outlet channel, one end of the first liquid outlet channel extends out of the urea box and is provided with a nozzle, and the second liquid outlet channel is communicated with the urea box and is used for enabling the urea solution to flow back into the urea box; the second liquid outlet channel is provided with a filter element A, a one-way valve and an overflow valve;
the opening degree of the nozzle is adjustable, and the control unit is electrically connected with the nozzle and used for controlling the opening degree of the nozzle.
2. The piping system for a urea injection apparatus according to claim 1,
and a pressure sensor is arranged on the first liquid outlet channel.
3. The piping system for a urea injection apparatus according to claim 1,
the nozzle is an electrically controlled nozzle.
4. The piping system for a urea injection apparatus according to claim 1,
the control unit is also electrically connected with the pump body and controls the rotating speed, the input current value and the current direction of the pump body.
5. The piping system for a urea injection apparatus according to claim 1,
and a filter element B is arranged on the pipeline connected with the liquid inlet end.
6. The piping system for a urea injection apparatus according to claim 1,
the pump body, the control unit, the pressure sensor, the filter element A, the one-way valve and the overflow valve are all arranged in the shell.
7. The piping system for a urea injection apparatus according to claim 2,
the pressure sensor is electrically connected to the control unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121478159.6U CN215633256U (en) | 2021-06-30 | 2021-06-30 | Pipeline system applied to urea injection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121478159.6U CN215633256U (en) | 2021-06-30 | 2021-06-30 | Pipeline system applied to urea injection device |
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| Publication Number | Publication Date |
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| CN215633256U true CN215633256U (en) | 2022-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121478159.6U Active CN215633256U (en) | 2021-06-30 | 2021-06-30 | Pipeline system applied to urea injection device |
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| CN (1) | CN215633256U (en) |
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2021
- 2021-06-30 CN CN202121478159.6U patent/CN215633256U/en active Active
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