CN219654763U - Urea injection device with back pump - Google Patents
Urea injection device with back pump Download PDFInfo
- Publication number
- CN219654763U CN219654763U CN202320771501.4U CN202320771501U CN219654763U CN 219654763 U CN219654763 U CN 219654763U CN 202320771501 U CN202320771501 U CN 202320771501U CN 219654763 U CN219654763 U CN 219654763U
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- Prior art keywords
- urea
- pump
- pipeline
- liquid outlet
- liquid inlet
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 121
- 239000004202 carbamide Substances 0.000 title claims abstract description 121
- 238000002347 injection Methods 0.000 title claims abstract description 43
- 239000007924 injection Substances 0.000 title claims abstract description 43
- 239000007788 liquid Substances 0.000 claims abstract description 55
- 230000000087 stabilizing effect Effects 0.000 claims description 27
- 238000003780 insertion Methods 0.000 claims description 18
- 230000037431 insertion Effects 0.000 claims description 18
- 239000000243 solution Substances 0.000 abstract description 40
- 238000005086 pumping Methods 0.000 abstract description 14
- 238000001914 filtration Methods 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 12
- 230000001276 controlling effect Effects 0.000 description 9
- 230000001105 regulatory effect Effects 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000605 extraction Methods 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
- 239000002245 particle Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Landscapes
- Exhaust Gas After Treatment (AREA)
Abstract
The utility model discloses a urea injection device with a reverse pumping pump, which comprises a urea box; the liquid inlet end of the main diaphragm pump is connected with the urea box through a liquid inlet pipeline, and the liquid outlet end of the main diaphragm pump is connected with the urea nozzle through a liquid outlet pipeline; the liquid inlet end of the back-pumping pump is connected with the urea nozzle through the liquid outlet pipeline, and the liquid outlet end of the back-pumping pump is connected with the urea tank through the liquid inlet pipeline; a pressure sensor is arranged on the liquid outlet pipeline; and the controller is connected with the main diaphragm pump and the back-pumping pump and is also connected with the pressure sensor. According to the utility model, the accurate control of the urea solution pressure is realized by adopting the main diaphragm pump and the DCU control end, the accuracy of urea solution quantitative injection is effectively improved, the diaphragm pump responds rapidly without delay by controlling the current, the filter element arranged in front is used as a filter device of the supply pump, the filtering accuracy of urea solution is effectively improved, the accuracy can reach the mu m level, the diaphragm pump is protected, and the maintenance time of the urea injection device is prolonged.
Description
Technical Field
The utility model relates to the field of urea injection devices. More particularly, the utility model relates to a urea injection device with a counter pump.
Background
In the operation of internal combustion engines of motor vehicles, such as diesel engines, nitrogen Oxides (NO) are often produced with an excess of oxygen x ) Thereby causing environmental pollution. In order to meet the increasingly stringent emission requirements and reduce the emission of nitrogen oxides, it is necessary to reduce the NO in the tail gas x Reducing to nitrogen and water, typically by injecting an aqueous urea solution as a reducing agent into the exhaust gas before it enters the catalyst to effect NO x The work is realized by pumping urea solution from a urea tank into tail gas of an exhaust pipeline after the urea solution is sucked by a urea supply pump, the urea supply pump plays a fundamental role in the whole process, and the supply pump is required to adapt to various extreme conditions, such as working capacity under low-temperature conditions in extremely cold regions. However, the urea injection device currently on the market has one problem: the urea solution remained in the pipeline is crystallized, damage is caused to the pipeline, and when the temperature is too low, the urea solution remained in the pipeline is frozen to block the pipeline, so that the system is problematic.
Disclosure of Invention
To achieve these objects and other advantages and in accordance with the purpose of the utility model, as embodied and broadly described herein, a urea injection device with a reverse pumping pump is provided, comprising:
a urea tank;
the main diaphragm pump and the back pump are arranged in parallel and are respectively connected with the urea tank and the urea nozzle through pipelines;
the liquid inlet end of the main diaphragm pump is connected with the urea box through a liquid inlet pipeline, a preposed large filter element is arranged on the liquid inlet pipeline, and the liquid outlet end of the main diaphragm pump is connected with the urea nozzle through a liquid outlet pipeline; the liquid inlet end of the back suction pump is connected with the urea nozzle through the liquid outlet pipeline, and the liquid outlet end of the back suction pump is connected with the urea tank through the liquid inlet pipeline; a pressure sensor is arranged on the liquid outlet pipeline;
and the controller is connected with the main diaphragm pump and the back-pumping pump, and is also connected with the pressure sensor.
Preferably, the urea injection device further comprises a shell, wherein the main diaphragm pump, the back pump, the pressure sensor and the urea box are all arranged in the shell, and the urea injection nozzle is arranged outside the shell.
Preferably, the urea box further comprises a liquid inlet small filter element which is placed in the urea box and is positioned at the bottom end of the liquid inlet pipeline.
Preferably, the controller is a DCU controller.
Preferably, the liquid outlet pipeline is connected with one end of a backflow pipeline, a one-way valve is arranged on the backflow pipeline, and the other end of the backflow pipeline is connected with the urea box.
Preferably, the return pipe is provided with an overflow member.
Preferably, the urea nozzle is an electronically controlled nozzle.
Preferably, the urea injection device with the back pump further comprises a pressure stabilizing structure, wherein the pressure stabilizing structure is arranged between the main diaphragm pump and the liquid outlet pipeline, and the pressure stabilizing structure is embedded in the shell.
Preferably, the voltage stabilizing structure includes:
the spring seat A is provided with a cover plate and an insertion section, and an open insertion space is downwards arranged in the insertion section of the spring seat A;
the pressure stabilizing bag is internally provided with an inner cavity, and the insertion section of the spring seat A extends into the inner cavity of the pressure stabilizing bag;
a spring seat B which is provided with an insertion section, wherein the insertion section of the spring seat B extends upwards into the insertion space of the spring seat A;
and the pressure stabilizing spring is sleeved on the spring seat A and the spring seat B at the same time.
The utility model at least comprises the following beneficial effects:
1. according to the utility model, the accurate control of the urea solution pressure is realized by adopting the main diaphragm pump and the DCU control end, the accuracy of urea solution quantitative injection is effectively improved, the diaphragm pump responds rapidly without delay by controlling the current, the filter element arranged in front is used as a filter device of the supply pump, the filtering accuracy of urea solution is effectively improved, the accuracy can reach the mu m level, the diaphragm pump is protected, and the maintenance time of the urea injection device is prolonged.
2. According to the utility model, the rotating speed of the main diaphragm pump is regulated by controlling the current of the input end, so that the urea solution can be easily extracted, and the pressure is stable by regulating the DCU control end according to the signal fed back by the pressure sensor. The frequency of the back-pumping pump is regulated by controlling the current of the input end, so that the system has a back-suction emptying function, residual solution in a pipeline after the back-suction injection is stopped can be pumped out and discharged back to the urea tank, and the problems that the residual solution in the injection system forms urea crystals in the pipeline, the diaphragm pump is worn and the nozzle is blocked due to the crystals are avoided. In extremely cold conditions, when the temperature is lower than-11 ℃, the residual solution freezes in the pipeline, when the system is started at low temperature, the urea conveying pipeline is blocked by the ice, and meanwhile, the frozen urea solution expands in volume, so that the pipeline is broken in a swelling manner, and the system is in fault; but the back-pumping pump with the back-suction emptying function can rapidly evacuate residual solution in the pipeline after the engine is shut down by controlling the back-pumping pump to operate, so that the risks of crystallization and icing of urea solution are 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 diagram of a urea injection apparatus with a counter pump according to the present utility model.
Fig. 2 is a schematic structural diagram of a voltage stabilizing structure in the present utility model.
Detailed Description
The present utility model is described in further detail below with reference to the drawings to enable those skilled in the art to practice the utility model by referring to the description.
The following description is presented to enable one of ordinary skill in the art to make and use the utility model. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art. The basic principles of the utility model 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 appreciated by those skilled in the art that in the present disclosure, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. refer to an orientation or positional relationship based on that shown in the drawings, which is merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore the above terms should not be construed as limiting the present utility model.
It will be understood that the terms "a" and "an" should be interpreted as referring to "at least one" or "one or more," i.e., in one embodiment, the number of elements may be one, while in another embodiment, the number of elements may be plural, and the term "a" should not be interpreted as limiting the number.
As shown in fig. 1-2, a preferred embodiment of the present utility model provides a urea injection apparatus with a counter pump, comprising:
a urea tank 1;
the main diaphragm pump 4 and the back-pumping pump 11 are arranged in parallel and are respectively connected with the urea tank 1 and the urea nozzle 6 through pipelines; the urea nozzle 6 is an electric control nozzle.
The liquid inlet end of the main diaphragm pump 4 is connected with the urea box 1 through a liquid inlet pipeline 13, a preposed large filter element 3 is arranged on the liquid inlet pipeline 13, and the liquid outlet end of the main diaphragm pump 4 is connected with the urea nozzle 6 through a liquid outlet pipeline 12; the liquid inlet end of the back suction pump 11 is connected with the urea box 1 through the liquid outlet pipeline 12, and the liquid outlet end of the back suction pump 11 is connected with the urea nozzle 6 through the liquid inlet pipeline 13; the liquid outlet pipeline 12 is provided with a pressure sensor 8;
a controller connected to the main diaphragm pump 4 and the backpumping pump 11, the controller also being connected to the pressure sensor 8. The controller is a DCU controller.
In the above technical scheme, the front filter element is installed on the liquid inlet pipeline 11, the accuracy of the front filter element can reach the mu m level, so that the filtering accuracy of urea solution can be effectively improved, the main diaphragm pump is protected, and the maintenance time of the urea injection device is prolonged. The main diaphragm pump 4 adjusts the rotation speed by controlling the current of the input end, so that the urea solution can be easily extracted, and the DCU control end adjusts the current of the input end according to the signal fed back by the pressure sensor, thereby controlling the rotation speed of the main diaphragm pump 4, and further achieving pressure stability.
That is, the technical proposal adopts the main diaphragm pump 4 and the DCU control end to realize the accurate control of the pressure of the urea solution, effectively improves the quantitative injection precision of the urea solution, has the precision reaching mg level, and has rapid response and no hysteresis by the method of controlling the current,
in addition, in the above technical scheme, the frequency of the back-pumping pump 11 is regulated by controlling the current of the input end, so that the system has a back-suction emptying function, and residual solution in a pipeline after back-suction injection is stopped can be pumped out and discharged back to the urea tank 1, thereby avoiding the problems that the residual solution in the injection system forms urea crystals in the pipeline, and the diaphragm pump is worn and the nozzle is blocked due to the crystallization. In extremely cold conditions, when the temperature is lower than-11 ℃, the residual solution freezes in the pipeline, when the system is started at low temperature, the urea conveying pipeline is blocked by the ice, and meanwhile, the frozen urea solution expands in volume, so that the pipeline is broken in a swelling manner, and the system is in fault; but the back-pumping pump 11 with the back-suction emptying function can rapidly evacuate residual solution in the pipeline after the engine is shut down by controlling the back-pumping pump to operate, so that the risks of urea solution crystallization and icing are eliminated, and the risk resistance of the injection system is improved.
The reverse suction function of the reverse suction pump 11 realizes the function of conveying urea solution reversely to the main diaphragm pump 4, and the up-and-down motion of the diaphragm sheet is driven by the electromagnet to realize the extraction and conveying of the urea solution, so that the structure is simple, the processing cost of the urea injection device is reduced, the structure of the urea injection device is simplified, the failure rate of the urea injection device is effectively reduced, the reliability of the device is improved, and the production cost and the production period of the urea injection device are also reduced.
In another technical scheme, the urea injection device further comprises a housing, the main diaphragm pump 4, the back pump 11, the pressure sensor 8 and the urea tank 1 are all arranged in the housing, and the urea nozzle 6 is arranged outside the housing.
In another technical scheme, the urea injection device further comprises a liquid inlet small filter element 2 which is placed in the urea box and is positioned at the bottom end of the liquid inlet pipeline. The urea solution pumped from the urea box through the liquid inlet pipeline is subjected to preliminary filtration, so that particles in the urea solution are filtered, and the system is protected.
In another technical scheme, the liquid outlet pipe 12 is connected with one end of the backflow pipe 14, a one-way valve is arranged on the backflow pipe 14, and the other end of the backflow pipe 14 is connected with the urea tank 1. The return line 14 is provided with an overflow 10.
The engine ECU sends signals to a DCU controller in a urea supply pump, the DCU controller controls the supply pump to start, suction is provided 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 8, one end of the urea solution returns to the urea tank 1 through an overflow part 10 and a return pipeline, the other end of the urea solution flows into an electric control nozzle 6 through a liquid outlet pipeline joint, at the moment, the pressure in the pipeline is stable, and when the nozzle receives a quantitative urea flow electric signal, the nozzle opens a corresponding opening to inject specified urea solution flow; after the engine is shut down, the DCU controller controls the input current of the back pump 11, at the moment, the main diaphragm pump 4 stops working, the back pump 11 rapidly starts to operate, and residual urea solution in the supply pump is pumped out.
In another technical scheme, the urea injection device with the back pump further comprises a pressure stabilizing structure, wherein the pressure stabilizing structure is arranged between the main diaphragm pump and the liquid outlet pipeline, and the pressure stabilizing structure is embedded in the shell.
In another technical scheme, the voltage stabilizing structure comprises: the spring seat A151, the pressure stabilizing bag 152, the spring seat B153 and the pressure stabilizing spring 154 are provided with cover plates and insertion sections, and an open insertion space is downwards arranged in the insertion section of the spring seat A151; the inside of the pressure stabilizing bag 152 is provided with an inner cavity, and the insertion section of the spring seat A151 extends into the inner cavity of the pressure stabilizing bag 152; the pressure stabilizing bladder 152 is made of rubber. The spring seat B153 is provided with an inserting section, and the inserting section of the spring seat B153 extends upwards into the inserting space of the spring seat A151; the pressure stabilizing spring 154 is sleeved on the spring seat A151 and the spring seat B153 at the same time.
The pressure stabilizing structure is positioned in a high-pressure area in the urea injection device and is used for maintaining the pressure stability of the urea injection device during operation and reducing pressure fluctuation caused by severe pressure change. In the running process of the urea injection device, the liquid pressure can continuously impact the rubber pressure stabilizing bag 152, the pressure stabilizing spring 154 can continuously stretch out and draw back to adjust the pressure, the spring seat B154 at the bottom can compress the spring, the top end of the spring seat B154 continuously moves up and down in the spring seat A151, so that the purpose of buffering the water pressure is achieved, the top end of the spring seat B154 is provided with a sharp corner spigot, and the sharp corner spigot contacts with the bottom of the spring seat A151 to play a limiting role.
Although embodiments of the present utility model have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the utility model would be readily apparent to those skilled in the art, and accordingly, the utility model is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (9)
1. The urea injection device of taking back pump, characterized by that includes:
a urea tank;
the main diaphragm pump and the back pump are arranged in parallel and are respectively connected with the urea tank and the urea nozzle through pipelines;
the liquid inlet end of the main diaphragm pump is connected with the urea box through a liquid inlet pipeline, a preposed large filter element is arranged on the liquid inlet pipeline, and the liquid outlet end of the main diaphragm pump is connected with the urea nozzle through a liquid outlet pipeline; the liquid inlet end of the back suction pump is connected with the urea nozzle through the liquid outlet pipeline, and the liquid outlet end of the back suction pump is connected with the urea tank through the liquid inlet pipeline; and a pressure sensor is arranged on the liquid outlet pipeline.
2. The urea injection device with a counter pump of claim 1, further comprising a housing, wherein the main diaphragm pump, the counter pump, the pressure sensor, and the urea tank are all disposed within the housing, and wherein the urea nozzle is disposed outside the housing.
3. The urea injection apparatus with a counter pump of claim 1, further comprising a small liquid inlet filter element disposed in the urea tank and positioned at the bottom end of the liquid inlet pipe.
4. The urea injection apparatus with a counter pump of claim 1, further comprising a controller connected to the main diaphragm pump and the counter pump, the controller further connected to the pressure sensor, the controller being a DCU controller.
5. The urea injection device with the back pump according to claim 1, wherein the liquid outlet pipeline is connected with one end of a backflow pipeline, a one-way valve is arranged on the backflow pipeline, and the other end of the backflow pipeline is connected with the urea box.
6. The urea injection device with a reverse pump according to claim 5, wherein the backflow pipe is provided with an overflow member.
7. The urea injection device with a counter pump of claim 1, wherein the urea nozzle is an electronically controlled nozzle.
8. The urea injection device with a counter pump of claim 2, further comprising a pressure stabilizing structure disposed between the main diaphragm pump and the liquid outlet conduit, and the pressure stabilizing structure is embedded within the housing.
9. The urea injection apparatus with a counter pump of claim 8, wherein the pressure stabilizing structure comprises:
the spring seat A is provided with a cover plate and an insertion section, and an open insertion space is downwards arranged in the insertion section of the spring seat A;
the pressure stabilizing bag is internally provided with an inner cavity, and the insertion section of the spring seat A extends into the inner cavity of the pressure stabilizing bag;
a spring seat B which is provided with an insertion section, wherein the insertion section of the spring seat B extends upwards into the insertion space of the spring seat A;
and the pressure stabilizing spring is sleeved on the spring seat A and the spring seat B at the same time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320771501.4U CN219654763U (en) | 2023-04-10 | 2023-04-10 | Urea injection device with back pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320771501.4U CN219654763U (en) | 2023-04-10 | 2023-04-10 | Urea injection device with back pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219654763U true CN219654763U (en) | 2023-09-08 |
Family
ID=87853885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320771501.4U Active CN219654763U (en) | 2023-04-10 | 2023-04-10 | Urea injection device with back pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219654763U (en) |
-
2023
- 2023-04-10 CN CN202320771501.4U patent/CN219654763U/en active Active
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