CN219654764U - Urea injection device with diaphragm pump and reversing valve - Google Patents
Urea injection device with diaphragm pump and reversing valve Download PDFInfo
- Publication number
- CN219654764U CN219654764U CN202320771545.7U CN202320771545U CN219654764U CN 219654764 U CN219654764 U CN 219654764U CN 202320771545 U CN202320771545 U CN 202320771545U CN 219654764 U CN219654764 U CN 219654764U
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- Prior art keywords
- urea
- diaphragm pump
- reversing valve
- liquid inlet
- liquid outlet
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 96
- 239000004202 carbamide Substances 0.000 title claims abstract description 96
- 238000002347 injection Methods 0.000 title claims abstract description 32
- 239000007924 injection Substances 0.000 title claims abstract description 32
- 239000007788 liquid Substances 0.000 claims abstract description 67
- 238000007789 sealing Methods 0.000 claims description 13
- 239000000243 solution Substances 0.000 description 38
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 12
- 230000001276 controlling effect Effects 0.000 description 7
- 238000002425 crystallisation Methods 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000008961 swelling Effects 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
- 239000003054 catalyst Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000003912 environmental pollution 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
- 238000005086 pumping Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Reciprocating Pumps (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The utility model discloses a urea injection device with a diaphragm pump and a reversing valve, which comprises: a urea tank; the liquid inlet end of the diaphragm pump is connected with the urea box through a liquid inlet pipeline, and a front filter element is arranged on the liquid inlet pipeline; the liquid inlet end of the reversing valve is connected with the liquid outlet end of the diaphragm pump, and the liquid outlet end of the reversing valve is connected with the urea nozzle; a pressure sensor is arranged on the liquid outlet pipeline; the control end is connected with the diaphragm pump and the reversing valve, and is also connected with the pressure sensor.
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 diaphragm pump and a reversing valve.
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, a preferred embodiment of the utility model provides a urea injection device with a diaphragm pump and a reversing valve, comprising:
a urea tank;
the liquid inlet end of the diaphragm pump is connected with the urea box through a liquid inlet pipeline;
the liquid inlet end of the reversing valve is connected with the liquid outlet end of the diaphragm pump, and the liquid outlet end of the reversing valve is connected with the urea nozzle;
the liquid inlet pipeline is provided with a preposed filter element, and the liquid outlet pipeline is provided with a pressure sensor;
and the control end is connected with the diaphragm pump and the reversing valve, and is also connected with the pressure sensor.
Preferably, the urea injection device with the diaphragm pump and the reversing valve further comprises a housing, wherein the diaphragm pump, the reversing valve, the pressure sensor and the urea tank are all arranged in the housing, and the urea nozzle is arranged outside the housing.
Preferably, the urea tank further comprises a liquid inlet filter element which is placed in the urea tank and is positioned at the bottom end of the liquid inlet pipeline.
Preferably, the control terminal is a DCU control terminal.
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 diaphragm pump comprises a shell, a magnet, a coil assembly, a shaft, a bracket, a small bearing, a connecting rod, a large bearing, an eccentric wheel, a diaphragm assembly, a pump body, a liquid inlet valve core, a liquid outlet valve core and a spring;
the inside of the shell is hollow, the magnet and the coil assembly are annular and are arranged in the inner space of the shell, and the shaft part penetrates through the shell and is fixedly connected with the shell; the eccentric wheel is sleeved on the outer surface of the shaft, the connecting rod is sleeved on the outer surface of the eccentric wheel through a large bearing, two brackets are respectively positioned at two sides of the connecting rod, the two brackets are sleeved on the outer surface of the shaft through small bearings, the pump body is arranged at the outer sides of the brackets and the connecting rod, a sealing space is formed between the two brackets and the connecting rod and between the two brackets and the pump body, so as to be used for accommodating the diaphragm assembly, the size of the sealing space is slightly larger than that of the diaphragm assembly, a liquid inlet valve core is arranged at the bottom of the pump body and is communicated with the sealing space, a liquid outlet valve core is also arranged at the bottom of the pump body and is communicated with the sealing space, a spring is sleeved outside the liquid outlet valve core, the liquid outlet valve core is lower than the liquid inlet valve core,
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 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 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 reversing valve is controlled by the current of the input end, after the reversing valve is electrified, the diaphragm pump operates to enable the system to have a back suction emptying function, residual solution in the pipeline after 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 due to the crystallization, the nozzle is blocked and the like 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 reversing valve with the back suction emptying function can rapidly evacuate residual solution in the pipeline after the engine is shut down by controlling the operation of the reversing valve by the system, eliminate the risks of crystallization and icing of urea solution and improve the anti-risk capability of the injection system.
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 device with a diaphragm pump and a reversing valve according to the present utility model.
Fig. 2 is a schematic structural view of a diaphragm pump according to 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 diaphragm pump and a reversing valve, comprising:
a urea tank 1;
the liquid inlet end of the diaphragm pump 4 is connected with the urea box 1 through a liquid inlet pipeline 13;
the liquid inlet end of the reversing valve 11 is connected with the liquid outlet end of the diaphragm pump 4, and the liquid outlet end of the reversing valve 11 is connected with the urea nozzle 6; the urea nozzle 6 is an electric control nozzle.
The liquid inlet pipeline 13 is provided with a preposed filter element 3, and the liquid outlet pipeline 12 is provided with a pressure sensor 8;
a control terminal connected to the diaphragm pump 44 and the reversing valve 11, the control terminal being further connected to the pressure sensor 8. The control end is a DCU control end.
In the technical scheme, the preposed filter element 3 is arranged on the liquid inlet pipeline 11, the precision of the preposed filter element can reach the mu m level, and thus, the filtering precision of urea solution can be effectively improved, the diaphragm pump is protected, and the maintenance time of the urea injection device is prolonged. The rotation speed of the diaphragm pump 4 is regulated by controlling the current of the input end, so that the urea solution can be easily extracted, and the DCU control end regulates the current of the input end according to the signal fed back by the pressure sensor, thereby controlling the rotation speed of the diaphragm pump 4, and further achieving pressure stability.
That is, the technical proposal adopts the diaphragm pump 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, has rapid response and no hysteresis by the method of controlling the current,
in addition, in the above technical scheme, the reversing valve 11 is controlled by the current of the input end, after the reversing valve 11 is electrified, the diaphragm pump 4 operates to enable the system to have a back suction emptying function, so that residual solution in a pipeline after back suction injection is stopped can be pumped out and discharged back to the urea tank 1, and the problems that urea crystals are formed in the pipeline by the residual solution in the injection system, the diaphragm pump is worn and blocked due to the crystallization and the like 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 reversing valve 11 with the back suction emptying function can quickly evacuate residual solution in the pipeline after the engine is shut down by controlling the operation of the reversing valve 11 by the system, so that the risks of crystallization and icing of urea solution are eliminated, and the risk resistance of the injection system is improved.
The reversing valve 11 has a back suction function, realizes the function of conveying urea solution reversely to the diaphragm pump 4, realizes the exchange of an inlet and an outlet of the diaphragm pump by driving the valve core to move up and down by the rear electromagnet, has a simple structure, reduces the processing cost of the urea injection device, simplifies the structure of the urea injection device, effectively reduces the failure rate of the urea injection device, improves the reliability of the device, and also reduces the production cost and the production period of the urea injection device.
In another embodiment, the urea tank further comprises a housing, wherein the diaphragm pump 44, the reversing valve 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. The shell can play a good role in protecting the parts of the equipment.
In another technical scheme, the liquid inlet filter element 2 is placed in the urea box and is positioned at the bottom end of the liquid inlet pipeline, and is used for carrying out preliminary filtration on urea solution pumped from the urea box through the liquid inlet pipeline, so as to filter out particulate matters in the urea solution and protect the system.
In another technical scheme, the liquid outlet pipe 12 is connected with one end of the backflow pipe 14, the backflow pipe 14 is provided with a one-way valve 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 diaphragm pump 4 stops working, the DCU controller controls the reversing valve 11 to be electrified, at the moment, the diaphragm pump 4 restarts to rapidly start to operate, and residual urea solution in the supply pump is pumped out.
In another technical solution, a specific structure of the diaphragm pump is provided, the diaphragm pump 4 includes a housing 410, a magnet 420, a coil assembly 430, a shaft 450, a bracket 460, a small bearing 470, a connecting rod 480, a large bearing 490, an eccentric wheel 410, a diaphragm assembly 413, a pump body 414, a liquid inlet valve core 415, a liquid outlet valve core 416, a spring 417, and an outlet valve seat 418, wherein,
the housing 410 is hollow, the magnet 420 and the coil assembly 430 are both ring-shaped and are both disposed in the inner space of the housing 410, and the shaft 450 partially penetrates through the housing 410 and is fixedly connected with the housing 410; the eccentric wheel 410 is sleeved on the outer surface of the shaft 450, the connecting rod 480 is sleeved on the outer surface of the eccentric wheel 410 through a large bearing 490, two brackets 460 are respectively positioned on two sides of the connecting rod 480, the two brackets 460 are sleeved on the outer surface of the shaft 450 through small bearings 460, the pump body 414 is arranged on the outer sides of the brackets 460 and the connecting rod 480, a sealing space is formed between the two brackets 460, the connecting rod 480 and the pump body 414, so as to be used for accommodating the diaphragm assembly 413, the size of the sealing space is slightly larger than that of the diaphragm assembly 413,
and the bottom of the pump body 414 is provided with a liquid inlet valve core 415 which is communicated with the sealing space, the bottom of the pump body 414 is also provided with a liquid outlet valve core 416 which is communicated with the sealing space, a spring 417 is sleeved outside the liquid outlet valve core 416, and the liquid outlet valve core is lower than the liquid inlet valve core.
In the above technical solution, after the urea spraying device is powered on, the DCU controller controls the main diaphragm pump PCB through current, the housing 410 and the magnet 420 start to rotate under the electromagnetic induction effect of the coil current, the shaft 450 and the eccentric wheel 410 start to rotate under the driving of the housing, the eccentric wheel 410 drives the connecting rod 480 to reciprocate up and down due to the eccentric amount relation, the diaphragm assembly 413 is driven by the connecting rod 480 to reciprocate up and down, the periphery of the diaphragm assembly 413 and the pump body 414 form a cavity in the middle during the upward movement due to the end face compression seal, and negative pressure is generated to drive the liquid inlet valve core 415 to open up, so that liquid enters the pump body 414 and the cavity of the diaphragm assembly 413; when the diaphragm 413 moves downward, the liquid is compressed, and a pressure compression spring 417 is generated to open the liquid outlet valve element 416, at this time, the liquid flows out from the outlet, and the liquid inlet valve element 415 seals the inlet under pressure to prevent the liquid from flowing out from the inlet. The outlet valve seat 418 serves as a support.
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 (8)
1. A urea injection device with a diaphragm pump and a reversing valve, comprising:
a urea tank;
the liquid inlet end of the diaphragm pump is connected with the urea box through a liquid inlet pipeline, and a front filter element is arranged on the liquid inlet pipeline;
the liquid inlet end of the reversing valve is connected with the liquid outlet end of the diaphragm pump, and the liquid outlet end of the reversing valve is connected with the urea nozzle through a liquid outlet pipeline; and a pressure sensor is arranged on the liquid outlet pipeline.
2. The urea injection device with a diaphragm pump and a directional valve of claim 1, further comprising a housing, wherein the diaphragm pump, the directional valve, 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 diaphragm pump and a reversing valve of claim 1, further comprising a liquid inlet filter element disposed in the urea tank and positioned at a bottom end of the liquid inlet line.
4. The urea injection apparatus with a diaphragm pump and a reversing valve of claim 1, further comprising a control terminal connected to the diaphragm pump and the reversing valve, the control terminal further connected to the pressure sensor, the control terminal being a DCU control terminal.
5. The urea injection device with a diaphragm pump and a reversing valve according to claim 1, wherein the liquid outlet pipe is connected to one end of a return pipe, a check valve is arranged on the return pipe, and the other end of the return pipe is connected to the urea tank.
6. The urea injection apparatus with a diaphragm pump and a reversing valve according to claim 5, wherein the return line is provided with an overflow member.
7. The urea injection device with a diaphragm pump and a reversing valve of claim 1, wherein the urea nozzle is an electronically controlled nozzle.
8. The urea injection apparatus with a diaphragm pump and a reversing valve of claim 1, wherein the diaphragm pump comprises a housing, a magnet, a coil assembly, a shaft, a bracket, a small bearing, a connecting rod, a large bearing, an eccentric, a diaphragm assembly, a pump body, a liquid inlet valve core, a liquid outlet valve core, and a spring; wherein the inside of the shell is hollow, the magnet and the coil assembly are annular and are arranged in the inner space of the shell, and the shaft part penetrates through the shell and is fixedly connected with the shell; the eccentric wheel is sleeved on the outer surface of the shaft, the connecting rod is sleeved on the outer surface of the eccentric wheel through a large bearing, two supports are respectively positioned on two sides of the connecting rod, the two supports are sleeved on the outer surface of the shaft through small bearings, the pump body is arranged on the outer side of the support and the connecting rod, a sealing space is formed between the two supports and the connecting rod and between the pump body, the sealing space is used for accommodating the diaphragm assembly, the size of the sealing space is larger than that of the diaphragm assembly, a liquid inlet valve core is arranged at the bottom of the pump body and is communicated with the sealing space, a liquid outlet valve core is further arranged at the bottom of the pump body and is communicated with the sealing space, and a spring is sleeved outside the liquid outlet valve core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320771545.7U CN219654764U (en) | 2023-04-10 | 2023-04-10 | Urea injection device with diaphragm pump and reversing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320771545.7U CN219654764U (en) | 2023-04-10 | 2023-04-10 | Urea injection device with diaphragm pump and reversing valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219654764U true CN219654764U (en) | 2023-09-08 |
Family
ID=87879637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320771545.7U Active CN219654764U (en) | 2023-04-10 | 2023-04-10 | Urea injection device with diaphragm pump and reversing valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219654764U (en) |
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2023
- 2023-04-10 CN CN202320771545.7U patent/CN219654764U/en active Active
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