CN218266069U - Prevent pipe-line system of urea solution crystallization - Google Patents
Prevent pipe-line system of urea solution crystallization Download PDFInfo
- Publication number
- CN218266069U CN218266069U CN202222727000.4U CN202222727000U CN218266069U CN 218266069 U CN218266069 U CN 218266069U CN 202222727000 U CN202222727000 U CN 202222727000U CN 218266069 U CN218266069 U CN 218266069U
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- China
- Prior art keywords
- pipeline
- urea
- pump
- urea solution
- liquid
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 239000004202 carbamide Substances 0.000 title claims abstract description 69
- 238000002425 crystallisation Methods 0.000 title claims abstract description 12
- 230000008025 crystallization Effects 0.000 title claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 58
- 238000011045 prefiltration Methods 0.000 claims 1
- 239000000243 solution Substances 0.000 abstract description 40
- 238000002347 injection Methods 0.000 abstract description 11
- 239000007924 injection Substances 0.000 abstract description 11
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 15
- 239000007789 gas Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
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- Exhaust Gas After Treatment (AREA)
Abstract
The utility model discloses a pipeline system for preventing crystallization of urea solution, which comprises a diaphragm pump and a reverse pump, wherein the liquid inlet end of the diaphragm pump and the liquid outlet end of the reverse pump are both communicated with one end of a liquid inlet pipeline, the other end of the liquid inlet pipeline is communicated with a urea box, and the urea box is filled with urea solution; the liquid outlet end of the diaphragm pump and the liquid inlet end of the back suction pump are both connected with one end of a connecting pipeline, the other end of the connecting pipeline is divided into two paths, one path is connected with the nozzle through a liquid outlet pipeline, and the other path is communicated with the urea box through a liquid return pipeline; and the liquid return pipeline is provided with a one-way valve. The utility model discloses can effectively improve urea injection apparatus's work efficiency and stability to remaining solution takes place the urea crystallization and then leads to pipe-line system to block up in avoiding the pipeline, makes injection apparatus normal operating.
Description
Technical Field
The utility model relates to a urea injection apparatus's pipe-line system field. More specifically, the present invention relates to a piping system for preventing crystallization of urea solution.
Background
When an internal combustion engine of an automobile, such as a diesel engine, is operated, nitrogen oxide (NOx) is generated with an excessive amount of oxygen in many cases, thereby causing environmental pollution. In order to meet the increasingly stringent emission requirements and reduce the emission of nitrogen oxides, NOx in the exhaust gas needs to be reduced into nitrogen and water, and usually, before the exhaust gas enters a catalyst, a urea aqueous solution is sprayed into the exhaust gas as a reducing agent to reduce the NOx. However, after the engine is shut down, urea crystallization can occur in the residual solution in the pipeline, so that the pipeline system is blocked, and the injection device cannot normally operate.
SUMMERY OF THE UTILITY MODEL
It is an object of the present invention to solve at least the above problems and to provide at least the advantages which will be described later.
In order to achieve these objects and other advantages in accordance with the present invention, a piping system for preventing crystallization of urea solution is provided, comprising a diaphragm pump and a back pump, wherein a liquid inlet end of the diaphragm pump and a liquid outlet end of the back pump are both communicated with one end of a liquid inlet pipe, the other end of the liquid inlet pipe is communicated with a urea tank, and urea solution is filled in the urea tank; the liquid outlet end of the diaphragm pump and the liquid inlet end of the reverse pump are both connected with one end of a connecting pipeline, the other end of the connecting pipeline is divided into two paths, one path is connected with the nozzle through a liquid outlet pipeline, and the other path is communicated with the urea box through a liquid return pipeline; and the liquid return pipeline is provided with a one-way valve.
Preferably, a preposed filter element is arranged on the liquid inlet pipeline, and a postpositive main filter element is arranged on the connecting pipeline.
Preferably, the diaphragm pump, the reverse pump, the check valve, the front filter element and the rear main filter element are all arranged in a shell.
Preferably, an S-shaped pipeline is arranged between the liquid return pipeline and the connecting pipeline, and the S-shaped pipeline is arranged in the shell.
Preferably, a pressure sensor is installed at one end of the liquid return pipeline close to the connecting pipeline.
The utility model discloses at least, include following beneficial effect:
the utility model provides a prevent pipe-line system of urea solution crystallization is parallelly connected through diaphragm pump and anti-pump suction and is placed, and liquid inlet pipe way, return liquid pipeline and drain pipe are shared, realize urea solution's injection and anti-function of taking out. When the urea solution is sprayed, the diaphragm pump is started, the urea solution in the urea box enters the diaphragm pump through the liquid inlet pipeline, then enters the liquid outlet pipeline through the connecting pipeline, and finally is atomized and sprayed by the nozzle to be mixed with tail gas; when the internal pressure of the pipeline exceeds the preset pressure, the check valve is opened, and part of urea solution is discharged into the urea box through the check valve and the return pipeline, so that the working efficiency and the stability of the urea injection device can be effectively improved. After the engine is flamed out, the urea solution remained in the liquid outlet pipeline is reversely pumped by the reverse pumping pump and is discharged back to the urea box through the liquid inlet pipeline, so that the problem that the residual solution in the pipeline is crystallized to cause the blockage of a pipeline system and cause the abnormal operation of the injection device is avoided.
Additional advantages, objects, and features of the invention 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 invention.
Drawings
FIG. 1 is a schematic diagram of a piping system for preventing crystallization of a urea solution according to the present invention;
fig. 2 is a schematic structural view of the housing of the present invention;
fig. 3 is a schematic view of the internal structure of the housing according to the present invention.
Detailed Description
The present invention is described in further detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring 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 described therein are commercially available unless otherwise specified; 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, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
As shown in fig. 1, the utility model provides a pipeline system for preventing crystallization of urea solution, including diaphragm pump 5 and back-suction pump 4, the feed liquor end of diaphragm pump 5 and the liquid outlet end of back-suction pump 4 all communicate with one end of feed liquor pipeline 2, the other end of feed liquor pipeline 2 communicates with urea case 1, urea solution is filled in urea case 1; the liquid outlet end of the diaphragm pump 5 and the liquid inlet end of the back suction pump 4 are both connected with one end of a connecting pipeline 6, the other end of the connecting pipeline 6 is divided into two paths, one path is connected with a nozzle 13 through a liquid outlet pipeline 12, and the other path is communicated with the urea box 1 through a liquid return pipeline 10; the liquid return pipeline 10 is provided with a one-way valve 11.
In this technical solution, the diaphragm pump 5 and the back-suction pump 4 are placed in parallel, and share the liquid inlet pipeline 2, the liquid return pipeline 10 and the liquid outlet pipeline 12, so as to realize the injection and back-suction functions of the urea solution. When the urea solution is sprayed, the diaphragm pump 5 is started, the reverse pump 4 is not started, and the urea solution does not pass through the reverse pump 4 at the moment due to a one-way valve arranged in the reverse pump 4. Under the action of the diaphragm pump 5, after entering the diaphragm pump 5 through the liquid inlet pipeline 2, the urea solution in the urea tank 1 enters the liquid outlet pipeline 12 through the connecting pipeline 6, and is finally atomized and sprayed by the nozzle 13, so as to be mixed with the tail gas. In order to maintain the pressure of the urea solution in the pipeline at the preset pressure and ensure the atomization quality of the urea solution, when the internal pressure of the pipeline exceeds the preset pressure, the one-way valve 11 is opened, part of the urea solution is discharged to the urea box 1 through the one-way valve 11 via the return pipeline 10, the pressure of the solution in the pipeline is reduced, and the working efficiency and the stability of the urea injection device can be effectively improved. After the engine stalls, diaphragm pump 5 stops to pump the urea solution, reverse pump 4 opens, remains the urea solution in the play liquid pipeline 12 is reversely taken out, the warp advance liquid pipeline 2 arrange back to urea case 1 avoids remaining solution in the pipeline to take place the urea crystallization and then leads to pipe-line system to block up, makes injection apparatus unable normal operating.
In another embodiment, a front filter element 3 is installed on the liquid inlet pipeline 2, and a rear main filter element 7 is arranged on the connecting pipeline 6. The urea solution is filtered by the front filter element 3 and the rear main filter element 7, so that the situation that impurities in the urea solution enter an injection system to cause abrasion of the diaphragm pump 5 and the back suction pump 4 and blockage of the nozzle 13 is avoided. When the back-suction pump 4 is used for back suction, the residual urea solution in the post-positioned main filter element 7 is also back-sucked and discharged back to the urea tank 1 through the liquid inlet pipeline 2.
In another embodiment, referring to fig. 2 and 3, the diaphragm pump 5, the reverse pump 4, the one-way valve 11, the front filter cartridge 3 and the rear main filter cartridge 7 are all disposed within a housing 14. The shell 14 is a closed shell, and the liquid inlet pipeline 2, the liquid return pipeline 10 and the liquid outlet pipeline 12 extend out of the shell 14. The various structures of the piping system are integrated into a whole by the housing 14, which provides protection and also facilitates installation.
In another embodiment, an S-shaped pipeline 8 is arranged between the return pipeline 10 and the connecting pipeline 6. The S-shaped pipe 8 may be such that part of the urea solution remains in the S-shaped pipe after the back pumping of the urea solution is finished. The S-shaped pipeline 8 is arranged in the shell 14, so that moisture in the urea solution in the S-shaped pipeline is not easy to evaporate, and urea is not easy to crystallize; when the vehicle is not operated for a long time, the check valve 11 can be ensured to be in a sealed and moist environment, and the check valve 11 is prevented from being blocked due to the precipitation of urea crystals caused by the evaporation of water in the urea solution in the liquid return pipeline 10.
In another embodiment, a pressure sensor 9 is installed at one end of the liquid return pipeline 10 close to the connecting pipeline 6. The pressure of the urea solution flowing out from the connecting pipeline 6 is detected by the pressure sensor 9, so that the one-way valve 11 is opened in time, the urea solution in the liquid outlet pipeline 12 is always maintained within a preset pressure range, and the atomization quality of the urea solution through the nozzle 13 is ensured. The pressure sensor 9 is likewise arranged in the housing 14.
While the embodiments of the invention have been described above, it is not intended to be limited to the details shown, or described, but rather to cover all modifications, which would come within the scope of the appended claims, and all changes which come within the meaning and range of equivalency of the art are therefore intended to be embraced therein.
Claims (5)
1. A pipeline system for preventing urea solution from crystallizing is characterized by comprising a diaphragm pump and a reverse pump, wherein a liquid inlet end of the diaphragm pump and a liquid outlet end of the reverse pump are both communicated with one end of a liquid inlet pipeline, the other end of the liquid inlet pipeline is communicated with a urea box, and the urea box is filled with urea solution; the liquid outlet end of the diaphragm pump and the liquid inlet end of the back suction pump are both connected with one end of a connecting pipeline, the other end of the connecting pipeline is divided into two paths, one path is connected with the nozzle through a liquid outlet pipeline, and the other path is communicated with the urea box through a liquid return pipeline; and the liquid return pipeline is provided with a one-way valve.
2. The pipeline system for preventing urea solution from crystallizing as claimed in claim 1, wherein a front filter element is installed on the liquid inlet pipeline, and a rear main filter element is installed on the connecting pipeline.
3. The conduit system according to claim 2, wherein the diaphragm pump, the back-pump, the check valve, the pre-filter, and the post-main filter are disposed in a housing.
4. Pipeline system for preventing urea solution from crystallizing according to claim 3, characterized in that an S-shaped pipeline is arranged between the return pipeline and the connecting pipeline, and the S-shaped pipeline is arranged in the shell.
5. Pipeline system for preventing the crystallization of urea solution according to claim 1, characterized in that the end of the return line close to the connecting line is equipped with a pressure sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222727000.4U CN218266069U (en) | 2022-10-17 | 2022-10-17 | Prevent pipe-line system of urea solution crystallization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222727000.4U CN218266069U (en) | 2022-10-17 | 2022-10-17 | Prevent pipe-line system of urea solution crystallization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218266069U true CN218266069U (en) | 2023-01-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222727000.4U Active CN218266069U (en) | 2022-10-17 | 2022-10-17 | Prevent pipe-line system of urea solution crystallization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218266069U (en) |
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2022
- 2022-10-17 CN CN202222727000.4U patent/CN218266069U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A Pipeline System to Prevent Crystallization of Urea Solution Effective date of registration: 20230809 Granted publication date: 20230110 Pledgee: Guanggu Branch of Wuhan Rural Commercial Bank Co.,Ltd. Pledgor: LOTUSFAIRY POWER TECHNOLOGIES Corp. Registration number: Y2023420000327 |