CN201982159U - Gas-liquid mixing device of urea metering pump of SCR (selective catalyst reaction) system - Google Patents
Gas-liquid mixing device of urea metering pump of SCR (selective catalyst reaction) system Download PDFInfo
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- CN201982159U CN201982159U CN2011200298898U CN201120029889U CN201982159U CN 201982159 U CN201982159 U CN 201982159U CN 2011200298898 U CN2011200298898 U CN 2011200298898U CN 201120029889 U CN201120029889 U CN 201120029889U CN 201982159 U CN201982159 U CN 201982159U
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Abstract
The utility model discloses a gas-liquid mixing device of a urea metering pump of an SCR (selective catalyst reaction) system, which is applied in one-step spraying of liquid reducing agent to form uniform suspension. The device comprises a metering valve, a mixing chamber and a spraying connector, the mixing chamber is connected with the metering valve and the spraying connector, the spraying connector is lower than the metering valve, and an acute angle is formed between the axial line of the mixing chamber and the axial line of the spraying connector or the metering valve. The gas-liquid mixing device has a delicate design and good gas-liquid mixing effect. The metering valve and air shutoff holes can be prevented from being blocked as a result of returning of the reducing agent.
Description
Technical field
The utility model relates to a kind of exhaust gas from diesel vehicle post-processing purifying system, relates in particular to the Liqiud-gas mixing device of urea metering pump in a kind of SCR system.
Background technique
Existing known, by the nitrogen oxide in selective catalytic reduction technology (SCR) the minimizing internal-combustion engine especially diesel engine vent gas is a kind of general technology path, that is: with reducing agent (aqueous solution of urea) process atomizing quantitative injection intake and exhaust pipeline, and under the effect of SCR catalyzer, the main harmful gas NOX in the waste gas is reduced to the discharge of nitrogen G﹠W, reach the purpose of tail gas clean-up.
Wherein, reducing agent is accurately to control injection by the measuring fixed amount valve, the reducing agent valve that is measured is ejected in the mixing chamber in its downstream, spray in the air inlet-outlet pipe through gas-liquid mixed atomizing back, and in real work a kind of situation is arranged: promptly pressurized air interrupts suddenly, does not purge the residual liquid in mixing chamber and the injection line, be higher than at atomizer nozzle under the situation of mixing chamber, residual liquid in the pipeline is known from experience and is back in the mixing chamber, and at mixing chamber intercrystalline/freeze, and causes that spray next time to stop up.There is the plain metering pump of pneumaturia generally to adopt the secondary-atomizing technology, promptly realizes primary atomization, aqueous solution of urea is become uniform suspension at mixing chamber; By injection pipe suspension is delivered to atomizer nozzle place on the outlet pipe, realize secondary-atomizing.If the secondary-atomizing effect is bad in the mixing chamber, can't form uniform suspension, also can't form uniform spraying at the atomizer nozzle place so, thereby influence emission reduction effect.
The model utility content
The purpose of this utility model is to have overcome above-mentioned shortcoming of the prior art, provide that a kind of design is ingenious, gas-liquid mixed is effective, and can avoid stopping up the dam Liqiud-gas mixing device of the urea metering pump in the SCR system of hole phenomenon of metering valve and air because of reducing agent backflows.
The purpose of this utility model is to reach by following measure, the Liqiud-gas mixing device of urea metering pump in the SCR system that the utility model provides, the primary atomization that is used for reducing agent liquid, to form uniform suspension, this device comprises metering valve, mixing chamber and jet-sub, described mixing chamber connects described metering valve and jet-sub, the position of described jet-sub is lower than the position of described metering valve, and the axial direction at described mixing chamber place axis and described jet-sub or described metering valve place forms an acute angle angle.
Described mixing chamber place axis and substantially horizontal form 20 ° of angles.
The Liqiud-gas mixing device of urea metering pump also comprises the air throttle orifice in the described SCR system, and described air throttle orifice is communicated with described mixing chamber.
Described air throttle orifice is formed on the tangent direction of described mixing chamber cross-sectional periphery.
Described air throttle orifice is arranged on an end of close described metering valve in the described mixing chamber.
The Liqiud-gas mixing device of urea metering pump also comprises pressure tap in the described SCR system, and described pressure tap is communicated with described mixing chamber, is used to measure the pressure in the mixing chamber.
Urea metering pump Liqiud-gas mixing device is simple in structure in the utility model SCR system, design is ingenious, the air throttle orifice is arranged on and optimizes the gas-liquid mixed effect on the mixing chamber tangent direction, metering valve and mixing chamber are arranged to several angle, avoided stopping up the phenomenon of metering valve because of reducing agent backflows, the air throttle orifice also is located at the highest point of mixing chamber inclined hole, the reductant solution crystallization that difficult quilt backflows/freeze and stop up.
Description of drawings:
Fig. 1 is a urea metering pump Liqiud-gas mixing device structural representation in the utility model SCR system
Fig. 2 is the sectional view of A-A direction among Fig. 1
Embodiment:
In order more to be expressly understood technology contents of the present utility model, describe in detail especially exemplified by following examples.
As shown in Figure 1, the Liqiud-gas mixing device of urea metering pump comprises metering valve 3 in the utility model SCR system, mixing chamber 4 and jet-sub 5, use SCR urea metering pump of the present utility model also to comprise inner panel 1 and outside plate 2, described metering valve 3 and described jet-sub 5 be separately positioned on described inner panel 1 and outside plate 2 away from two surfaces on, form a columned cavity passage between described inner panel 1 and the outside plate 2, described mixing chamber is formed at the cavity passage between described metering valve 3 and the jet-sub 5, the reducing agent that is used for metering valve 3 is ejected carries out primary atomization, reducing agent after the atomizing sprays air inlet-outlet pipe through other pipeline in jet-sub 5 and the SCR system and atomizer nozzle, and carry out catalytic reduction reaction with reducing agent in the outlet pipe, reach the purpose of tail gas clean-up.
As shown in Figure 1, the position of described jet-sub 5 is lower than the position of described metering valve 3, described mixing chamber 4 place axis and substantially horizontal form an acute angle angle, and promptly described mixing chamber 4 is obliquely installed, and it is good forming 20 ° of angles with substantially horizontal in this preferred embodiment, like this, after injection action finishes, even have remaining reducing agent, gravitate in the mixing chamber, reducing agent also downwards (being the jet-sub direction) flow, stop up the spray orifice of metering valve and can not backflow.
As shown in Figure 1, the Liqiud-gas mixing device setting of urea metering pump also comprises air throttle orifice 6 in the utility model SCR system, described air throttle orifice one end connects the source of the gas (not shown), the other end is communicated with described mixing chamber 4, in the process of metering valve 3 injection reduction agent, high velocity air tangentially enters in the mixing chamber 4 by air throttle orifice 6, carries out primary atomization to spraying the reducing agent that advances, to form uniform suspension.
Preferably, described air throttle orifice 6 is formed on the tangent direction of described mixing chamber 4 cross-sectional periphery (as shown in Figure 2), because air throttle orifice 6 and mixing chamber 4 tangent settings, according to the cyclone separator principle, in the time of in tangential gas flow enters mixing chamber 4, rotational gas flow and interior rotational gas flow outside can in the chamber, forming, because jet-sub 5 is arranged on described mixing chamber 4 bottoms, outer rotational gas flow can attach chamber wall rotation, and towards blowing away from the direction of jet-sub 5, promptly the direction to metering valve 3 blows, when reaching the mixing chamber top, can form interior rotational gas flow again, with export-oriented air-flow reversing motion, simultaneously, when air-flow collects in the metering valve spray orifice, under the jet pressure effect of metering valve 3, the reducing agent that ejects is fully stirred by interior rotational gas flow, and blows downwards, is blown into the outlet pipe (not shown) through jet-sub 5 and carries out selective catalytic reduction reaction; In mixing chamber,, reduce the crystallization risk, and help forming uniform spraying, improve the catalytic reduction reaction effect at the atomizer nozzle (not shown) place in jet-sub downstream because stirring action can form aqueous solution of urea uniform suspension.
Preferably, described air throttle orifice is arranged on an end of close described metering valve in the described mixing chamber, promptly is opened in the highest point of mixing chamber, and the reductant solution that difficult quilt backflows freezes/the crystallization obstruction.
As shown in Figure 1, the Liqiud-gas mixing device of urea metering pump also comprises pressure tap 7 in the described SCR system, described pressure tap 7 is communicated with described mixing chamber 4, be used to measure the pressure transducer of described mixing chamber 4 internal pressures, accurately control the emitted dose of metering valve by the measured value of pressure transducer, reach stable injection action, improve the purpose of accuracy of spray.
In the utility model, pressure tap 7 is arranged on the more stable position of mixing chamber internal pressure value, promptly near the position of described jet-sub 5, because the position air-flow near metering valve 3 is stronger, force value is often stable inadequately, and after the metered injection pump was installed, described pressure tap will be difficult for being stopped up by urea liquid, reduced the risk that do not detect force value next time.
To sum up, ingenious, metering valve of the Liqiud-gas mixing device of urea metering pump design and mixing chamber are arranged to several angle in the utility model SCR system, avoided stopping up the phenomenon of metering valve and air throttle orifice because of reducing agent backflows, the air throttle orifice is arranged on optimizes the gas-liquid mixed effect on the mixing chamber tangent direction.
In this specification, the utility model only is described with reference to its certain embodiments, still, still can make various modifications and conversion obviously and does not deviate from spirit and scope of the present utility model, therefore, the utility model specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (7)
1.SCR the Liqiud-gas mixing device of urea metering pump in the system, comprise metering valve, mixing chamber and jet-sub, described mixing chamber connects described metering valve and jet-sub, it is characterized in that: the position of described jet-sub is lower than the position of described metering valve, and described mixing chamber place axis and substantially horizontal form an acute angle angle.
2. the Liqiud-gas mixing device of urea metering pump in the SCR according to claim 1 system is characterized in that: described mixing chamber place axis and substantially horizontal form 20 ° of angles.
3. the Liqiud-gas mixing device of urea metering pump in the SCR according to claim 1 and 2 system is characterized in that: the Liqiud-gas mixing device of urea metering pump also comprises the air throttle orifice in the described SCR system, and described air throttle orifice is communicated with described mixing chamber.
4. the Liqiud-gas mixing device of urea metering pump in the SCR according to claim 1 and 2 system, it is characterized in that: described air throttle orifice is formed on the tangent direction of described mixing chamber cross-sectional periphery.
5. the Liqiud-gas mixing device of urea metering pump in the SCR according to claim 4 system is characterized in that: described air throttle orifice is arranged in the described mixing chamber end near described metering valve.
6. the Liqiud-gas mixing device of urea metering pump in the SCR system according to claim 1 or 5 is characterized in that: the Liqiud-gas mixing device of urea metering pump also comprises pressure tap in the described SCR system, and described pressure tap is communicated with described mixing chamber.
7. the Liqiud-gas mixing device of urea metering pump in the SCR according to claim 6 system is characterized in that: described pressure tap is arranged on the position near described jet-sub.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200298898U CN201982159U (en) | 2011-01-28 | 2011-01-28 | Gas-liquid mixing device of urea metering pump of SCR (selective catalyst reaction) system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200298898U CN201982159U (en) | 2011-01-28 | 2011-01-28 | Gas-liquid mixing device of urea metering pump of SCR (selective catalyst reaction) system |
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| CN201982159U true CN201982159U (en) | 2011-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200298898U Expired - Fee Related CN201982159U (en) | 2011-01-28 | 2011-01-28 | Gas-liquid mixing device of urea metering pump of SCR (selective catalyst reaction) system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103615300A (en) * | 2013-11-12 | 2014-03-05 | 北京工业大学 | Device and method for performance testing of SCR (selective catalytic reduction) postprocessing system or component of diesel engine |
| CN106151021A (en) * | 2016-09-22 | 2016-11-23 | 凯龙高科技股份有限公司 | A kind of urea pump of tilting air valve |
| CN106362271A (en) * | 2016-08-29 | 2017-02-01 | 名高医疗器械（昆山）有限公司 | Medicine sprayer |
| CN106437959A (en) * | 2015-08-04 | 2017-02-22 | 浙江福爱电子有限公司 | Gas-liquid mixing type SCR spraying device |
-
2011
- 2011-01-28 CN CN2011200298898U patent/CN201982159U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103615300A (en) * | 2013-11-12 | 2014-03-05 | 北京工业大学 | Device and method for performance testing of SCR (selective catalytic reduction) postprocessing system or component of diesel engine |
| CN103615300B (en) * | 2013-11-12 | 2017-01-11 | 北京工业大学 | Device and method for performance testing of SCR (selective catalytic reduction) postprocessing system or component of diesel engine |
| CN106437959A (en) * | 2015-08-04 | 2017-02-22 | 浙江福爱电子有限公司 | Gas-liquid mixing type SCR spraying device |
| CN106437959B (en) * | 2015-08-04 | 2019-01-01 | 浙江福爱电子有限公司 | A kind of gas-liquid mixed SCR injection apparatus |
| CN106362271A (en) * | 2016-08-29 | 2017-02-01 | 名高医疗器械（昆山）有限公司 | Medicine sprayer |
| CN106151021A (en) * | 2016-09-22 | 2016-11-23 | 凯龙高科技股份有限公司 | A kind of urea pump of tilting air valve |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 215211, No. 666 Fen Lu, Fen Hu Town, Wujiang City, Jiangsu, Suzhou Patentee after: Suzhou PowerGreen Emission Solution System Co., Ltd. Address before: 215211 Wujiang City, Jiangsu province FENHU Economic Development Zone, the community Fen Road No. 666 Patentee before: Suzhou PowerGreen Emission Solution System Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110921 Termination date: 20170128 |