CN220185844U - Prevent urea injection valve, urea injection system and vehicle of inhalation impurity - Google Patents
Prevent urea injection valve, urea injection system and vehicle of inhalation impurity Download PDFInfo
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- CN220185844U CN220185844U CN202321705119.XU CN202321705119U CN220185844U CN 220185844 U CN220185844 U CN 220185844U CN 202321705119 U CN202321705119 U CN 202321705119U CN 220185844 U CN220185844 U CN 220185844U
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 148
- 239000004202 carbamide Substances 0.000 title claims abstract description 147
- 238000002347 injection Methods 0.000 title claims abstract description 61
- 239000007924 injection Substances 0.000 title claims abstract description 61
- 239000012535 impurity Substances 0.000 title claims abstract description 20
- 238000007789 sealing Methods 0.000 claims abstract description 23
- 230000037406 food intake Effects 0.000 claims description 2
- 238000005086 pumping Methods 0.000 description 13
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- 239000000243 solution Substances 0.000 description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Landscapes
- Exhaust Gas After Treatment (AREA)
Abstract
The utility model relates to the technical field of tail gas treatment, in particular to a urea injection valve, a urea injection system and a vehicle for preventing impurities from being inhaled. A urea injection valve comprising: a valve housing, a valve seat and a valve stem; the valve sleeve is provided with a cavity, the valve seat is arranged at the bottom of the cavity in a sealing way, the valve seat is provided with a nozzle, and the valve rod is arranged in the cavity of the valve sleeve and can seal the nozzle; the valve sleeve is characterized in that an air passage communicated with the outside is arranged in the valve sleeve shell wall, an air vent communicated with the air passage is arranged on the side wall of the valve seat, and the other end of the air vent is communicated with the valve sleeve cavity. The utility model solves the problems of nozzle orifice reduction or blockage and pollution to the urea pump and the urea box.
Description
Technical Field
The utility model relates to the technical field of tail gas treatment, in particular to a urea injection valve, a urea injection system and a vehicle for preventing impurities from being inhaled.
Background
Aiming at the problem of NOx in the tail gas emission of an internal combustion engine, SCR is widely used in the industry for eliminating NOx. The reductant selected was a 32.5% urea solution, the urea pump pressure was stabilized at 9bar using an injection system (urea tank + urea pump + urea nozzle combination) in combination with a control strategy, and dosing of the urea solution was achieved by varying the duty cycle of the nozzle.
In order to avoid the situation that the residual urea aqueous solution in the injection system is frozen when the temperature is low and the pump or the pipeline is damaged, the urea pump is usually selected to pump reversely after the power is turned off so as to empty urea in the injection system. However, since the nozzle needs to be opened during back pumping, carbon and other impurities enter the injection system through the nozzle, not only can the nozzle spray hole become small or blocked, but also a urea pump and a urea box can be polluted, so that the emission is deteriorated, and the market problem frequently occurs.
Disclosure of Invention
Aiming at the defects of the prior art, the embodiment of the utility model aims to provide a urea injection valve for preventing impurities from being inhaled, so as to solve the problems that nozzle orifices become smaller or blocked and a urea pump and a urea box are polluted.
In order to achieve the above object, the embodiment of the present utility model provides the following technical solutions:
a urea injection valve that prevents the ingestion of impurities, comprising: a valve housing, a valve seat and a valve stem; the valve sleeve is provided with a cavity, the valve seat is arranged at the bottom of the cavity in a sealing way, the valve seat is provided with a nozzle, and the valve rod is arranged in the cavity of the valve sleeve and can seal the nozzle; the valve sleeve is characterized in that an air passage communicated with the outside is arranged in the valve sleeve shell wall, an air vent communicated with the air passage is arranged on the side wall of the valve seat, and the other end of the air vent is communicated with the valve sleeve cavity.
Preferably, the air path comprises a channel and an air cavity, the channel is in a round hole shape, the air cavity is an annular cavity, one end of the channel is communicated with outside air, the other end of the channel is communicated with the air cavity, a plurality of vent holes are uniformly distributed on the valve seat along the axis, and a plurality of vent holes are communicated with the air cavity.
Preferably, a one-way valve is arranged in the round hole-shaped channel, the one-way valve can enable the channel to be conducted in the direction from the air cavity to the channel, and the air cavity is cut off in the direction from the air cavity to the channel.
Preferably, the channel and the outer wall of the valve sleeve form an air inlet, and an air filter is arranged at the air inlet.
Preferably, the upper side of the valve sleeve is provided with a urea inlet, the upper end of the valve rod is provided with a hollow pipe, the urea inlet is communicated with the inside of the hollow pipe, the pipe wall of the hollow pipe is provided with a through hole, and the through hole communicates the inside of the hollow pipe with the cavity of the valve sleeve.
Preferably, the lower end of the valve rod is provided with a first sealing surface, the valve seat is provided with a second sealing surface, the first sealing surface and the second sealing surface are both spherical surfaces, and the nozzle is arranged in the center of the second sealing surface.
Preferably, a spring is arranged in the valve sleeve, one end of the spring is propped against the convex ring of the valve sleeve, one end of the spring is propped against the valve rod, and an electromagnetic coil is also arranged in the valve sleeve.
The embodiment of the utility model also provides a urea injection system which comprises a urea pump, a urea tank and the urea injection valve for preventing impurities from being sucked.
Preferably, the urea pump is communicated with the urea inlet of the urea injection valve through a first pipeline, and is communicated with the urea pump through a second pipeline and a third pipeline, wherein the urea flow direction in the second pipeline is from the urea pump to a urea tank, and the urea flow direction in the third pipeline is from the urea tank to the urea pump.
The embodiment of the utility model also provides a vehicle comprising the urea injection system.
One or more technical solutions provided in the embodiments of the present utility model at least have the following technical effects or advantages:
after stopping and powering down, the urea pump is reversely pumped, and is communicated with the outside air through the air passage in the valve sleeve, so that urea is pumped back into the urea box again, and the residual urea is prevented from freezing. Therefore, when the urea injection valve is used for pumping the urea pump reversely, the valve rod does not need to be lifted to open the nozzle, so that impurities are prevented from being sucked into the nozzle, and the problems that the spray hole of the nozzle is small or blocked and the urea pump and the urea box are polluted are solved. The urea can be smoothly and thoroughly emptied in the back-pumping stage without the action of a nozzle, and the problems of pollution or blockage of an injection system caused by back-pumping can be avoided.
Additional aspects of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.
FIG. 1 is a cross-sectional view of a urea injection valve provided by an embodiment of the present utility model;
FIG. 2 is a schematic view of a valve seat provided in an embodiment of the present utility model;
FIG. 3 is a perspective cross-sectional view of a valve seat provided by an embodiment of the present utility model;
FIG. 4 is a schematic illustration of a valve stem provided by an embodiment of the present utility model;
FIG. 5 is a schematic diagram of a urea injection system provided by an embodiment of the present utility model;
FIG. 6 is a reverse flow chart of a urea injection system provided by an embodiment of the present utility model;
in the figure: 1. a valve sleeve; 11. an electromagnetic coil; 12. an air cavity; 13. a channel; 14. a urea inlet; 2. a valve stem; 21. a through hole; 22. a first sealing surface; 3. a valve seat; 31. a nozzle; 32. a vent hole; 33. a second sealing surface; 4. a spring; 5. a one-way valve; 6. an air filter; 01. a urea injection valve; 02. a urea pump; 03. a urea tank; 04. a first pipeline; 05. a second pipeline; 06. a third pipeline;
the mutual spacing or dimensions are exaggerated for the purpose of showing the positions of the various parts, and the schematic illustrations are used for illustration only.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the utility model. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the utility model clearly indicates otherwise, and it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Basic working principle of SCR system: exhaust gas flows out of the turbine of the supercharger and then enters the exhaust pipe, and meanwhile, a quantitative urea aqueous solution is sprayed into the exhaust pipe in a mist form through a urea injection valve arranged on the exhaust pipe, and urea liquid drops undergo hydrolysis and pyrolysis reaction under the action of high-temperature exhaust gas to generate required reducer ammonia (NH) 3 ) Ammonia (NH) 3 ) Selective reduction of nitrogen oxides (NOx) to nitrogen (N) by means of a catalyst 2 )。
In order to avoid the situation that residual urea aqueous solution in the injection system freezes when the temperature is low after the power-down is stopped, the urea pump is usually used for pumping down after the power-down, the nozzle is opened when the pumping down is carried out, and the nozzle is closed after the pumping down is completed. Negative pressure can be formed when the injection system is reversely pumped, at the moment, the nozzle is opened, and impurities in the exhaust pipe can block the spray hole or make the spray hole smaller, and even pollute the whole injection system. In order to solve the technical problems, the utility model provides a urea injection valve for preventing impurities from being inhaled.
As shown in fig. 1 to 4, an embodiment of the present utility model provides a urea injection valve 01 for preventing the inhalation of impurities, comprising: a valve housing 1, a valve seat 3 and a valve stem 2; the valve sleeve 1 is provided with a cavity, the valve seat 3 is arranged at the bottom of the cavity in a sealing way, the valve seat 3 is provided with a nozzle 31, and the valve rod 2 is arranged in the cavity of the valve sleeve 1 and can seal the nozzle 31; the valve sleeve 1 is characterized in that an air passage communicated with the outside is arranged in the shell wall of the valve sleeve 1, an air vent 32 communicated with the air passage is arranged on the side wall of the valve seat 3, and the other end of the air vent 32 is communicated with the cavity of the valve sleeve 1.
After stopping and powering down, the urea pump 02 is reversely pumped, and the air path in the valve sleeve 1 is communicated with the outside air, so that urea is pumped back into the urea box 03 again, and the residual urea is prevented from freezing. Therefore, when the urea injection valve 01 of the utility model is used for pumping the urea pump 02 reversely, the valve rod 2 does not need to be lifted to open the nozzle 31, so that the impurity is prevented from being sucked into the nozzle 31, and the problems that the nozzle 31 is small or blocked and the urea pump 02 and the urea tank 03 are polluted are solved. Namely, the urea can be smoothly and thoroughly emptied in the back-pumping stage without the action of the nozzle 31, and the problems of pollution or blockage of an injection system caused by back-pumping can be avoided.
As shown in fig. 1, the air path includes a channel 13 and an air cavity 12, the channel 13 is at the upper end of the valve sleeve 1, the longitudinal section is a circular hole with a Z-shaped cross section, the air cavity 12 is an annular cavity at the lower end, the upper end of the channel 13 is communicated with the outside air, the lower end is communicated with the air cavity 12, the valve seat 3 is uniformly provided with a plurality of air vents 32 along the axis, as shown in fig. 2 and 3, in this embodiment, 4 air vents 32 are provided, and 4 air vents 32 are all communicated with the air cavity 12. When the urea pump 02 is reversely pumped, the valve rod 2 is abutted against the nozzle 31 of the valve seat 3, and external air enters the cavity of the valve sleeve 1 through the channel 13, the air cavity 12 and the vent hole 32, so that the urea is thoroughly emptied.
As shown in fig. 1, a one-way valve 5 is arranged in the circular hole-shaped channel 13, and the one-way valve 5 can lead the channel 13 to be conducted to the direction of the air cavity 12, and lead the air cavity 12 to be blocked to the direction of the channel 13. When the urea injection valve 01 works normally, the one-way valve 5 is closed, so that urea is prevented from being injected from the channel 13; when the power-off urea pump 02 is turned off and is reversely pumped, the one-way valve 5 is conducted, so that external air enters the cavity of the valve sleeve 1, and urea can be emptied without opening the nozzle 31. The one-way valve 5 not only avoids the problems of blockage of the nozzle 31, but also avoids the problem of urea spraying when the urea injection valve 01 works normally.
The channel 13 and the outer wall of the valve sleeve 1 form an air inlet, an air filter 6 is arranged at the air inlet, dust and other impurities in the air are filtered through the air filter 6, and the impurities in the outside air are prevented from entering the injection system to cause urea pollution.
The valve sleeve 1 is matched with other positions of the valve rod 2 and the valve seat 3 and the action relation is just the prior art, and the utility model is not limited in particular. In one embodiment, the upper side of the valve sleeve 1 is provided with a urea inlet 14, the upper end of the valve rod 2 is a hollow pipe, as shown in fig. 4, the urea inlet 14 is communicated with the inside of the hollow pipe, the wall of the hollow pipe is provided with a through hole 21, and the inside of the hollow pipe is communicated with the cavity of the valve sleeve 1 by the through hole 21. The lower end of the valve rod 2 is provided with a first sealing surface 22, the valve seat 3 is provided with a second sealing surface 33, the first sealing surface 22 and the second sealing surface 33 are spherical, and the nozzle 31 is arranged at the center of the second sealing surface 33. A spring 4 is arranged in the valve sleeve 1, one end of the spring 4 is propped against a convex ring of the valve sleeve 1, one end of the spring is propped against the valve rod 2, and an electromagnetic coil 11 is further arranged in the valve sleeve 1. When the coil is electrified, an upward suction force is generated on the valve rod 2, the valve rod 2 moves upwards against the elastic force of the spring 4, so that the first sealing surface 22 of the valve rod 2 is separated from the second sealing surface 33 of the valve seat 3, and urea is sprayed out from the nozzle 31 from the urea inlet 14 through the hollow tube, the through hole 21 and the cavity of the valve rod 2; when the coil is de-energized, the valve rod 2 is reset under the action of the spring 4, so that the valve rod 2 moves downwards to block the nozzle 31.
Based on the urea injection valve 01, the embodiment of the utility model also provides a urea injection system, as shown in fig. 5, comprising a urea pump 02, a urea tank 03 and the urea injection valve 01. The urea tank 03 is used for storing urea and is connected with a urea pump 02. The urea pump 02 is used for pumping urea solution in the urea box 03, maintaining certain pressure, and then delivering the urea solution to the urea injection valve 01, so as to meet the requirements of an injection metering system on flow and pressure. The urea injection valve 01 realizes the quantitative injection of urea.
The urea pump 02 is communicated with the urea inlet 14 of the urea injection valve 01 through a first pipeline 04, the urea pump 02 is communicated with the urea pump 02 through a second pipeline 05 and a third pipeline 06, wherein the flow direction of urea in the second pipeline 05 is from the urea pump 02 to the urea tank 03, and the flow direction of urea in the third pipeline 06 is from the urea tank 03 to the urea pump 02.
As shown in fig. 6, the present routine is entered when the vehicle T15 is powered down. The urea evacuation time t1 is calibrated. When the vehicle T15 is detected to be powered down, the urea pump 02 is depressurized, enters an emptying stage, and starts to reversely pump, and is communicated with the atmosphere at the moment, after the reverse pumping for the time T1, urea residues are avoided, and the reverse pumping is finished.
Based on the above urea injection system, the embodiment of the present utility model further provides a vehicle, in which the urea injection system described in the above embodiment is provided, and since the urea injection system (urea injection valve 01) has the above technical effects, the technical effects of the vehicle adopting the urea injection system are referred to the above embodiment.
While the foregoing description of the embodiments of the present utility model has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the utility model, but rather, it is intended to cover all modifications or variations within the scope of the utility model as defined by the claims of the present utility model.
Claims (10)
1. A urea injection valve that prevents the ingestion of impurities, comprising: a valve housing, a valve seat and a valve stem;
the valve sleeve is provided with a cavity, the valve seat is arranged at the bottom of the cavity in a sealing way, the valve seat is provided with a nozzle, and the valve rod is arranged in the cavity of the valve sleeve and can seal the nozzle;
the valve sleeve is characterized in that an air passage communicated with the outside is arranged in the valve sleeve shell wall, an air vent communicated with the air passage is arranged on the side wall of the valve seat, and the other end of the air vent is communicated with the valve sleeve cavity.
2. The urea injection valve for preventing impurity inhalation according to claim 1, wherein the air path comprises a channel and an air cavity, the channel is round-hole-shaped, the air cavity is an annular cavity, one end of the channel is communicated with the outside air, the other end of the channel is communicated with the air cavity, a plurality of vent holes are uniformly distributed on the valve seat along the axis, and a plurality of vent holes are communicated with the air cavity.
3. The urea injection valve for preventing impurity inhalation according to claim 2, wherein a one-way valve is arranged in the circular hole-shaped channel, and the one-way valve can conduct the channel to the air cavity direction, and the air cavity is blocked to the channel direction.
4. A urea injection valve according to claim 2, wherein said channel forms an air inlet with the outer wall of said valve housing, said air inlet being provided with an air filter.
5. The urea injection valve for preventing impurity inhalation according to claim 1, wherein a urea inlet is arranged on the upper side of the valve sleeve, a hollow tube is arranged at the upper end of the valve rod, the urea inlet is communicated with the inside of the hollow tube, through holes are arranged on the wall of the hollow tube, and the through holes are communicated with the inside of the hollow tube and the cavity of the valve sleeve.
6. The urea injection valve of claim 5, wherein the lower end of the valve stem has a first sealing surface, the valve seat has a second sealing surface, the first sealing surface and the second sealing surface are both spherical surfaces, and the nozzle is disposed in the center of the second sealing surface.
7. The urea injection valve of claim 6, wherein a spring is disposed within the valve housing, one end of the spring being disposed against the collar of the valve housing and one end being disposed against the valve stem, and an electromagnetic coil being disposed within the valve housing.
8. A urea injection system comprising a urea pump, a urea tank and a urea injection valve according to any one of claims 1-7 that prevents the inhalation of impurities.
9. The urea injection system of claim 8, wherein the urea pump is in communication with the urea inlet of the urea injection valve via a first line, the urea pump is in communication with the urea pump via a second line and a third line, wherein the direction of urea flow in the second line is from the urea pump to a urea tank, and the direction of urea flow in the third line is from the urea tank to the urea pump.
10. A vehicle comprising the urea injection system of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321705119.XU CN220185844U (en) | 2023-06-30 | 2023-06-30 | Prevent urea injection valve, urea injection system and vehicle of inhalation impurity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321705119.XU CN220185844U (en) | 2023-06-30 | 2023-06-30 | Prevent urea injection valve, urea injection system and vehicle of inhalation impurity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220185844U true CN220185844U (en) | 2023-12-15 |
Family
ID=89109847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321705119.XU Active CN220185844U (en) | 2023-06-30 | 2023-06-30 | Prevent urea injection valve, urea injection system and vehicle of inhalation impurity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220185844U (en) |
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2023
- 2023-06-30 CN CN202321705119.XU patent/CN220185844U/en active Active
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