CN201862508U - Pressure stabilizer of urea spraying and metering system of internal combustion engine - Google Patents
Pressure stabilizer of urea spraying and metering system of internal combustion engine Download PDFInfo
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- CN201862508U CN201862508U CN2010206574280U CN201020657428U CN201862508U CN 201862508 U CN201862508 U CN 201862508U CN 2010206574280 U CN2010206574280 U CN 2010206574280U CN 201020657428 U CN201020657428 U CN 201020657428U CN 201862508 U CN201862508 U CN 201862508U
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- stablizer
- spring
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
The utility model discloses a pressure stabilizer suitable for a urea spraying and metering system of an internal combustion engine. The pressure stabilizer adopts an upper-and-lower split structure and mainly comprises a diaphragm assembly, an upper spring, a lower spring and a pressure sensor. The pressure stabilizer is divided into a cavity and a pressure stabilization cavity from top to bottom by the diaphragm assembly; and a diaphragm fluctuates along with the pressure of urea solution and correspondingly moves to become balance, so that the volume of the pressure stabilization cavity is changed to reduce the pressure fluctuation of a spraying container. As the diaphragm is made of fabric strengthening rubber, the spring is made of stainless steel, and the upper body and the lower body are made of metallic aluminium, and the pressure stabilizer has the capability of resisting urea corrosion. The pressure stabilizer is provided with a pressure sensor; the pressure of the urea spraying system can be more accurately controlled by an electric control system; and the measuring precision of the urea spraying in the range of small flow is obviously improved. The pressure stabilizer not only can increase the working pressure, but also has better pressure stabilization effect, and simultaneously has the advantages of high response speed, small volume and low cost.
Description
Technical field
The utility model relates to the internal-combustion engines exhaust gas purifying system, particularly a kind of stable-pressure device that is used for the urea-spray system of diesel engine reduction NOx discharging.
Background technology
In the present internal-combustion engines exhaust gas purifying system, particularly diesel engine extensively adopts SCR (Selective Catalyst Reduction) SCR technology in order further to reduce the NOx discharging in the waste gas.This SCR technology adopts the method for metered injection urea liquid in the exhaust pipe of engine, utilizes urea to make NOx be reduced into nitrogen as catalyst, reaches the effect that reduces the NOx discharging.The pressure oscillation of urea liquid is controlled in necessary strictness in this system, accurately controls the emitted dose of urea liquid.
The stable-pressure device that is used for SCR urea-spray system in the prior art has bladder energy storage equipment (seeing U.S. Pat 650250B2) and spring diaphragm chip stable-pressure device (seeing U.S. Pat 629315B1).Though bladder energy storage equipment voltage regulation result is good, volume is big, and the gas of the certain pressure of need substituting the bad for the good in leather bag in advance, adaptability and manipulate very inconvenient; The result of use of spring diaphragm chip stable-pressure device is pretty good, but bring up under the situation of 1000kPa from 500kPa at urea-spray pressure, the volume of putting spring diaphragm chip stable-pressure device on existing increases obviously, can not satisfy the structure and the performance requirement of urea-spray system.SCR urea-spray system requirements expulsion pressure fluctuation range is less than ± 5kPa..
SCR urea-spray system is a kind of low discharge accurate measurement spraying system.The degree of stability of expulsion pressure has a significant impact its measuring accuracy.Urea liquid is through flowing into pressure stabilizing cavity after the pressurization of urea pump, is issued to system design temperature in the effect of pressure-regulating valve, do not having under the situation of stable-pressure device, and the pressure oscillation of pressure stabilizing cavity is often bigger, causes the reduction of spraymeter accuracy of measurement.In addition, in order to improve the atomization of urea solution jet,, improve expulsion pressure and be effective means as not adopting the gas secondary injection.Under higher expulsion pressure, the adaptability of stable-pressure device is very big for the structural design influence of SCR system.Under the prerequisite that does not increase the stable-pressure device volume, still satisfy the stability requirement after system works pressure improves, just this patent problem to be solved.
Summary of the invention
In order to improve the pulverability of internal combustion engine urea-spray system, improve the measuring accuracy of urea-spray and the pressure stability of system, the utility model proposes a kind of stable-pressure device of new internal combustion engine urea-spray system.The urea liquid flow of this stable-pressure device is 5L/h～20L/h, it is characterized in that: a spring diaphragm chip voltage-stablizer is arranged in the above-mentioned stable-pressure device, this voltage-stablizer adopts the body structure of being made by the metal material of anti-urea corrosion of branch up and down, diaphragm unit is installed between voltage-stablizer upper body and the voltage-stablizer lower body, install respectively in the both sides up and down of diaphragm unit and to put spring and underlying spring, the voltage-stablizer upper body communicates with cavity and atmosphere that the top of diaphragm unit forms, the below of voltage-stablizer lower body and diaphragm unit forms pressure stabilizing cavity, is full of urea liquid in the pressure stabilizing cavity; The voltage-stablizer lower body has three passages, is respectively and the outlet of pressure sensor, urea nozzle threeway and the interface that pressure regulator valve is connected; The working pressure range of voltage-stablizer is 300kPa～1000kPa, and the pressure oscillation scope is less than ± 5kPa.
Other technologies feature of the present utility model is: the stroke that (1) above-mentioned diaphragm unit moves up and down in voltage-stablizer is 0～8 millimeter.The pretightning force of putting spring and underlying spring on (2) in the described voltage-stablizer is by changing the thickness of going up lower spring cup and adjusting packing ring or adopting the adjustment screw to adjust.(3) described voltage-stablizer upper body and voltage-stablizer lower body adopt the metal aluminum or aluminum alloy manufacturing of anti-urea corrosion, put the stainless steel wire manufacturing that spring and underlying spring adopt anti-urea corrosion on described.(4) described diaphragm unit is made up of diaphragm and spring base, and the material of diaphragm is the fabric reinforcing rubber, and the material of making spring base is a stainless steel.
The beneficial effects of the utility model are to satisfy the needs that the diesel exhaust cleaning system further reduces the NOx discharging, for providing a kind of, the urea-spray system can improve operating pressure, the stable-pressure device that can have better voltage regulation result again, it is fast to have response speed simultaneously, volume is little, the advantage that cost is low.
Description of drawings
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Fig. 1 is the schematic diagram that has adopted a kind of internal combustion engine urea-spray of the present utility model system.
Fig. 2 is spring diaphragm chip stabilizator structure figure of the present utility model.
Fig. 3 is an enforcement illustration of the present utility model.
Among the figure, 1, pressure regulator valve, 2, voltage-stablizer, 3, pressure sensor, 4, the urea liquid case, 5, check valve, 6, membrane pump, 7, cleaner, 8, motor, 9, temperature sensor, 10, the nozzle threeway, 11, urea nozzle, 12, the SCR ECU, 13, exhaust gas temperature sensor, 14, the SCR catalytic converter, 15, the NOx sensor, 16, the pressure sensor passage, 17, diaphragm unit, 18, the voltage-stablizer lower body, 19, the voltage-stablizer upper body, 20, screwed hole, 21, upper spring seat, 22, on put spring, 23, cavity, 24, adjust packing ring, 25, the pressure regulator valve passage, 26, pressure stabilizing cavity, 27, the underlying spring, 28, lower spring cup, 29, the voltage stabilizing passage, 30, voltage stabilizing inlet ductwork joint
The specific embodiment
Among Fig. 1, motor 8 drives membrane pump 6, behind the urea liquid of extracted urea liquor box 4, is introduced into cleaner 7, and the solution of pressurization is connected cleaner 7, urea nozzle 11 and voltage-stablizer 2 successively by pipeline and nozzle threeway 10.Urea liquid enters pressure regulator valve 1 after flowing through voltage-stablizer 2, makes that the pipe-line system pressure between membrane pump 6 and the pressure regulator valve 1 remains on design load.Urea nozzle 11 is placed between cleaner 7 and the voltage-stablizer 2, can make the turnover loine pressure that connects urea nozzle 11 keep stable.Temperature sensor 9 is housed on cleaner 7 in addition, is used to monitor the injection temperation of urea liquid; Pressure sensor 3 is housed on voltage-stablizer, and sampled signal is handled through going into SCR ECU 12, the ability to work that SCR ECU 12 passes through the speed controlling and adjusted membrane pump 6 of motor 8, and it is stable to make that expulsion pressure remains in the SCR system work process; Check valve 5 can make this urea hydraulic systems possess the ability that oppositely empties urea liquid; The emitted dose of urea nozzle 11 is to determine according to the signal of the signal of the exhaust gas temperature sensor 13 of the waste gas that enters SCR catalytic converter 14 and NOx sensor 15 is common.
Fig. 2 is the structure chart of this spring diaphragm chip voltage-stablizer.In Fig. 2, diaphragm unit 17 is installed between voltage-stablizer upper body 19 and the voltage-stablizer lower body 18.The stroke that diaphragm unit 17 moves up and down in voltage-stablizer is 0～8 millimeter, and present embodiment is chosen as 6 millimeters.Install respectively in the both sides up and down of diaphragm unit and to put spring 22 and underlying spring 27.The cavity 23 that the top of voltage-stablizer upper body 19 and diaphragm unit 17 forms communicates through screwed hole 20 and atmosphere.The below of voltage-stablizer lower body 18 and diaphragm unit 17 forms pressure stabilizing cavity 26, is full of urea liquid during pressure stabilizing cavity 26 inherent work.Voltage-stablizer lower body 18 has three through holes, is respectively three passages 16,29,25 that are connected with pressure sensor 3, voltage stabilizing inlet ductwork joint 30 and pressure regulator valve 1.The pretightning force of putting spring 22 and underlying spring 27 in the voltage-stablizer can be by changing upper spring seat 21, lower spring cup 28 and adjusting the thickness adjustment of packing ring 24 or add the adjustment screw on screwed hole 20 and adjust.
Fig. 3 is a kind of embodiment of the present utility model, and the installment state of voltage-stablizer is put spring 22 and underlying spring 27 reaches dynamic balance on this moment as shown in Figure 3, and diaphragm unit 17 is in the equilbrium position, lower end.When urea liquid enters voltage-stablizer from passage 29, diaphragm unit 17 moves up, and (for example 500kPa) reaches the equilbrium position, center under design pressure, puts spring 22 on this moment and underlying spring 27 still is in compressive state.Be the duty of voltage-stablizer this moment, and diaphragm unit 17 is subjected to the acting in conjunction of the pressure of urea liquid, two spring forces and atmospheric environment pressure.
Voltage-stablizer of the present utility model can reach the effect of steady pressure automatically.When fluctuation took place pressure, diaphragm unit 17 can correspondingly move up and down the equilbrium position and change the volume of pressure stabilizing cavity 26.Specifically, when the pressure of urea liquid increases suddenly, move on the diaphragm unit 17, the volume of pressure stabilizing cavity 26 increases, and urea pressure reduces.When the pressure of urea liquid reduced suddenly, diaphragm moved down, and the volume of pressure stabilizing cavity reduces, and urea pressure increases.This shows that diaphragm unit 17 is experienced the fluctuation of pressure by the variation of equilbrium position, has played the degenerative effect of pressure.Pressure stabilizing cavity 26 and nozzle threeway 10 are connected by pipeline, and the therefore pressure of reactive spray cavity volume variation has rapidly improved the measuring accuracy of urea-spray system.
Voltage-stablizer 2 should adopt the material manufacturing of anti-urea corrosion.Voltage-stablizer upper body 19, voltage-stablizer lower body 18 adopt the manufacturing of metal aluminum or aluminum alloy in the present embodiment, and parts such as spring and spring base adopt the stainless steel manufacturing.Diaphragm unit 17 is made up of diaphragm and spring base, and the material of diaphragm is the fabric reinforcing rubber, and the material of making spring base is a stainless steel.
Claims (6)
1. the stable-pressure device of an internal combustion engine urea-spray system, the urea liquid flow 5L/h～20L/h of this stable-pressure device, it is characterized in that: a spring diaphragm chip voltage-stablizer is arranged in the above-mentioned stable-pressure device, this voltage-stablizer adopts the body structure of being made by the metal material of anti-urea corrosion of branch up and down, diaphragm unit is installed between voltage-stablizer upper body and the voltage-stablizer lower body, install respectively in the both sides up and down of diaphragm unit and to put spring and underlying spring, the voltage-stablizer upper body communicates with cavity and atmosphere that the top of diaphragm unit forms, the below of voltage-stablizer lower body and diaphragm unit forms pressure stabilizing cavity, is full of urea liquid in the pressure stabilizing cavity; The voltage-stablizer lower body has three passages, is respectively and the outlet of pressure sensor, urea nozzle threeway and the interface that pressure regulator valve is connected; Working pressure range 300kPa～the 1000kPa of voltage-stablizer, the pressure oscillation scope is less than ± 5kPa.
2. the stable-pressure device of internal combustion engine urea-spray according to claim 1 system, it is characterized in that: the stroke that wherein said diaphragm unit moves up and down in voltage-stablizer is 0～8 millimeter.
3. the stable-pressure device of internal combustion engine urea-spray according to claim 1 system is characterized in that: the pretightning force of putting spring and underlying spring in the described voltage-stablizer is adjusted screw and is adjusted by changing the thickness of going up lower spring cup and adjusting packing ring or adopting.
4. the stable-pressure device of internal combustion engine urea-spray according to claim 1 system is characterized in that: wherein said voltage-stablizer upper body and voltage-stablizer lower body adopt the metal aluminum or aluminum alloy manufacturing of anti-urea corrosion.
5. the stable-pressure device of internal combustion engine urea-spray according to claim 1 system is characterized in that: put the stainless steel wire manufacturing that spring and underlying spring adopt anti-urea corrosion on wherein said.
6. the stable-pressure device of internal combustion engine urea-spray according to claim 1 system, it is characterized in that: wherein said diaphragm unit is made up of diaphragm and spring base, and the material of diaphragm is the fabric reinforcing rubber, and the material of making spring base is a stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206574280U CN201862508U (en) | 2010-12-07 | 2010-12-07 | Pressure stabilizer of urea spraying and metering system of internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206574280U CN201862508U (en) | 2010-12-07 | 2010-12-07 | Pressure stabilizer of urea spraying and metering system of internal combustion engine |
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| Publication Number | Publication Date |
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| CN201862508U true CN201862508U (en) | 2011-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206574280U Expired - Lifetime CN201862508U (en) | 2010-12-07 | 2010-12-07 | Pressure stabilizer of urea spraying and metering system of internal combustion engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106903005A (en) * | 2017-04-10 | 2017-06-30 | 农业部南京农业机械化研究所 | A kind of secondary gas-liquid two-phase flow electrostatic sprayer |
-
2010
- 2010-12-07 CN CN2010206574280U patent/CN201862508U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106903005A (en) * | 2017-04-10 | 2017-06-30 | 农业部南京农业机械化研究所 | A kind of secondary gas-liquid two-phase flow electrostatic sprayer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170719 Address after: 214063 Jiangsu city of Wuxi province Qian Rong Lu No. 15 Patentee after: China FAW Group Corporation Address before: 214063 Jiangsu city of Wuxi province Qian Rong Lu No. 15 Patentee before: Wuxi Fuel Injection Equipment Institute, China FAW Group Corporation |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110615 |