CN201738998U - Constant-pressure metered jetting system - Google Patents
Constant-pressure metered jetting system Download PDFInfo
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- CN201738998U CN201738998U CN201020265501XU CN201020265501U CN201738998U CN 201738998 U CN201738998 U CN 201738998U CN 201020265501X U CN201020265501X U CN 201020265501XU CN 201020265501 U CN201020265501 U CN 201020265501U CN 201738998 U CN201738998 U CN 201738998U
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Abstract
The utility model relates to a constant-pressure metered jetting system comprising a liquid reserve tank, a pump motor assembly, a metered jetting device and a mixing chamber, wherein the liquid reserve tank, the pump motor assembly, the metered jetting device and the mixing chamber are sequentially connected through pipelines; and the constant-pressure metered jetting system also comprises a pressure-regulating valve connected in series between the pump motor assembly and the metered jetting device, or the pressure-regulating valve and the metered jetting device are connected in parallel with the downstream of the pump motor assembly. The constant-pressure metered jetting system has the advantages of skillful design, accurate control, simplicity and convenience, and by constantly metering the pressure difference between the upstream and the downstream of the metered jetting device, the jet volume can be controlled just by controlling the pulse width (the opening time t) of the metered jetting device.
Description
Technical field
The utility model relates to a kind of exhaust gas from diesel vehicle post-processing purifying system, relates in particular to a kind of constant voltage type metering injection system.
Background technique
Along with improving constantly of vehicular emission standard, the vehicle tai-gas clean-up system is the day by day extremely concern of vehicle manufacturers also, and wherein the diesel engine vent gas after-treatment device is as an important component part of diesel-oil vehicle, and various technology paths are also ripe gradually.
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, be about to reducing agent (aqueous solution of urea) through atomizing quantitative injection intake and exhaust pipeline, and by the SCR catalyzer the main harmful gas NOX in the waste gas is changed into the nitrogen G﹠W and discharge, reach the purpose of tail gas clean-up.
In the prior art, the SCR technology generally all is by a pump motor assembly reducing agent to be flowed to the metered injection device, the metered injection device is mapped to injection of reducing agent in the mixing chamber by accurate measurement, in mixing chamber, mix by high velocity air, and formation suspension is delivered to nozzle realization atomizing, the accurate control of metered injection is the key technology of exhaust aftertreatment in the metered injection process, because reducing agent sprays the waste that too much can cause reducing agent on the one hand, can cause reaction inhomogeneous on the other hand, even ammonia is revealed the formation secondary pollution; The reducing agent injection is very few then reacts insufficient, does not reach good purifying effect.
In course of injection, changing can appear in the pressure in metered injection device downstream, and then causes that the pressure reduction in metered injection device upstream and downstream changes, if do not adjust the opening time length of metered injection device, can cause that emitted dose changes.In the prior art in order to reach the effect of accurate injection, often the upstream and downstream at the metered injection device respectively is provided with a pressure transducer, accurately control emitted dose by pressure reduction and pulse-width controlled, promptly formed the pressure reduction and the function of opening burst length length of emitted dose with the injection apparatus upstream and downstream, be Q=F (Δ P, t), wherein total amount is sprayed in the Q representative, Δ P represents the pressure difference in metered injection device upstream and downstream, the time of pulse is opened in the t representative, under this structure, owing to be subjected to the influence of two parameters, control is difficulty, and precision is relatively poor.
The model utility content
The purpose of this utility model is to have overcome above-mentioned shortcoming of the prior art, and a kind of constant voltage type metering injection system is provided, and the utility model design is ingenious, control is convenient, and cost is lower, and can reach accurate control accuracy.
To achieve these goals, the utility model provides a kind of constant voltage type metering injection system, comprise liquid tank, pump motor assembly, metered injection device and mixing chamber, described liquid tank, pump motor assembly, metered injection device and mixing chamber pipeline successively are connected, described constant voltage type metering injection system also comprises pressure regulator valve, described pressure regulator valve is connected between described pump motor assembly and the described metered injection device, perhaps, described pressure regulator valve and described metered injection device are connected in parallel on the downstream of described pump motor assembly.
Described pressure regulator valve comprises diaphragm and is arranged on the elastic element and the movable post of diaphragm both sides, described diaphragm is divided into described pressure regulator valve in first chamber and second chamber of mutual sealing, described elastic element is arranged in first chamber, one end by pressure strip against described diaphragm, in the fixedly connected described pressure regulator valve of the other end first chamber away from an end of described diaphragm; The end plate that described movable post is wholely set by its upper end near an end of described diaphragm is against described diaphragm, away from an end of described diaphragm, pressure regulator valve can effectively be stablized pressure difference in first chamber and second chamber by automatic adjusting to the described movable post the other end in described pressure regulator valve second chamber.
Preferably, described pressure regulator valve by second chamber respectively with described pump motor assembly and described metered injection device pipeline connection.
Preferably, end away from described diaphragm in described pressure regulator valve second chamber is provided with a refluxing opening, described refluxing opening is by described movable post sealing, described pressure regulator valve and described liquid tank pipeline connection, one end of described pipeline is arranged on reducing agent liquid level upside in the described liquid tank, the other end of described pipeline is communicated with described pressure regulator valve second chamber by described refluxing opening, this pipeline can balance first chamber and second chamber in pressure difference.
Preferably, described pressure regulator valve first chamber is communicated with described mixing chamber pipeline, forms the air pressure feedback pipe.
Preferably, the pressure transducer of connecting between described pressure regulator valve and the described metered injection device can be responded to the hydraulic pressure in this pipeline.
More preferably, described pressure regulator valve periphery is provided with an electromagnetic coil, can produce magnetic force after the energising of described electromagnetic coil, and described movable post is opened return port under the effect of magnetic force, the air in can the emptying return line before injection.
Described pump motor assembly, electromagnetic coil, pressure transducer and metered injection device circuit respectively connect measurement control unit (DCU)
The utlity model has following beneficial effect: by the pressure difference of constant metering injection apparatus upstream and downstream, emitted dose only need be controlled by the pulsewidth (opening time t) of control dosage injection apparatus, i.e. Q=F (t), and the utility model design is ingenious, control accurately, and is simple and convenient.
Description of drawings:
Fig. 1 is the utility model constant voltage type metering injection system preferred embodiment control graph.
Fig. 2 is a pressure regulator valve stereogram in the utility model preferred embodiment.
Fig. 3 is a pressure regulator valve sectional view in the utility model preferred embodiment.
Fig. 4 is the utility model constant voltage type metering injection system embodiment two control schematic representation.
Fig. 5 is a pressure regulator valve stereogram among the utility model embodiment two.
Embodiment:
In order more to be expressly understood technology contents of the present utility model, describe in detail especially exemplified by following examples.
Wherein, Fig. 1-Fig. 3 is the utility model preferred embodiment.
As shown in Figure 1, the utility model relates to a kind of constant voltage type metering injection system, comprise liquid tank 1, pump motor assembly 2, pressure regulator valve 3, filter 4, metered injection device 5 and mixing chamber 6, described liquid tank 1, pump motor assembly 2, pressure regulator valve 3, filter 4, metered injection device 5 is connected with mixing chamber 6 series pipe successively, there is reducing agent (aqueous solution of urea) in the liquid tank, pump motor assembly 2 is pumped into reducing agent in the pressure regulator valve 3 by pipeline 7-1,4 pairs of reducing agents of filter play the filtering effect, 5 pairs of reducing agents of metered injection element carry out metered injection, mixing chamber 6 pipelines series connection compressed gas source 21, the high velocity air that compressed gas source 21 forms in mixing chamber 6 mixes the reducing agent that ejects, and form suspension and deliver to nozzle and realize atomizing, and in being discharged into outlet pipe 23, nozzle 22 carries out selective catalytic reduction reaction.
Described pump motor assembly 2 is diaphragm pump or an electromagnetic pump common in the prior art.
As Fig. 2, shown in Figure 3, described pressure regulator valve 3 comprises diaphragm 8 and is separately positioned on the diaphragm elastic element 9 and the movable post 10 of both sides up and down, described diaphragm 8 is divided into described pressure regulator valve 3 in first chamber 11 and second chamber 12 of mutual sealing, described elastic element 9 is arranged in first chamber 11, the fixedly connected pressure strip 19 of one end, described pressure strip 19 be against diaphragm 8, the end face in the fixedly connected described pressure regulator valve of the other end of described elastic element 93 first chambeies 11; The integrally formed end plate 14 in described movable post 10 tops, described end plate 14 are against described diaphragm 8, and described movable post 10 ends are against the bottom in described pressure regulator valve 3 second chambeies 12; The end plate 14 of pressure strip 19 and movable post 10 separates by diaphragm 8, and forms first chamber 11 and second chamber 12 of sealing mutually, and described pressure strip 19 and movable post 10 can move in first chamber 11 and second chamber 12 respectively mutually.
Described movable post 10 is made by the metallic material of magnetic conduction and anti-urea liquid corrosion, or the coating of the anti-urea corrosion of plating on the magnetic conductive metal material, as polytetrafluoroethylene etc.
Described pressure regulator valve 3 bottoms are provided with a refluxing opening 13, pressure regulator valve second chamber 12 is communicated with described liquid tank by refluxing opening 13 and pipeline 7-2, the other end of pipeline 7-2 is arranged on reducing agent liquid level upside in the described liquid tank, under static state, described movable post 10 seals described refluxing opening 13 under the effect of elastic element 9.
As shown in Figure 1-Figure 3, in this preferred embodiment, on described pressure regulator valve 3 sidewalls liquid entering hole 16 and liquid outlet 17 are set, described liquid entering hole 16 and liquid outlet 17 are communicated with described second chamber 12, described pressure regulator valve 3 is by liquid entering hole 16 and described pump motor assembly 2 pipeline connections, described pressure regulator valve 3 is by liquid outlet 17 and described metered injection device 5 pipeline connections, the hydraulic pressure P of metered injection device 5 upstreams like this
1Form reponse system with the hydraulic pressure in second chamber 12.
On the sidewall in described pressure regulator valve 3 first chambeies 11 pressure feedback mouth 18 is set also, described pressure regulator valve first chamber 11 is communicated with by pressure feedback mouth 18 and pipeline 7-3 with mixing chamber 6, like this air pressure P in the mixing chamber 6
2Form the air pressure feedback with the air pressure in first chamber 11.
Preferably, the pressure transducer 25 of connecting between described pressure regulator valve 3 and the described metered injection device 5, described pressure transducer 25 are used to respond to the hydraulic pressure in the pipeline 7-4, i.e. P among Fig. 1
1Pressure.
More preferably, described metered injection device 5 peripheries are provided with an electromagnetic coil 24, and described electromagnetic coil 24 is electrically connected described measurement control unit 15, forms magnetic field by circuit control, described movable post 10 magnetic field force induced effects are up and down, and then open or close described refluxing opening 13.
The circuit pack solid line is represented pipeline among the figure, the dotted line indication circuit; Described pump motor assembly 2, electromagnetic coil 24, pressure transducer 25 and metered injection device 5 circuit respectively connect measurement control unit 15 (DCU).
The utility model constant voltage type metering injection system control principle is as follows:
As Fig. 1, shown in Figure 2, at first by electromagnetic coil 24 is switched on, described movable post 10 is opened return port 13 under the effect of electromagnetic force, finish the emptying of pipeline 7-2 by the air-flow pumping, when control system receives injection signal, by outage closing volume hole 13, pump motor assembly 2 is started working simultaneously, reducing agent in the liquid tank 1 is pumped in second chamber 12 in the pressure regulator valve 3, because return port 13 is not opened, pressure in second chamber 12 and the pipeline 7-4 can continue to increase, and begins to spray when metered injection device 5 receives injection signal, and the hydraulic pressure of metered injection device 5 upstreams and the air pressure in the mixing chamber 6 can form a pressure difference Δ P at this moment.
Simultaneously, in reducing agent pumping process, if pressure are greater than in first chamber 11 during pressure in pressure regulator valve 3 second chambeies 12, pressure can be resisted the elastic force of elastic element 9, move on the diaphragm 8 drive activity posts 10, this moment, return port 13 was opened, because emptying in the pipeline 7-2, therefore the reducing agent in second chamber 12 is back to liquid tank 1 under pressure, lasting backflow has also reduced second chamber, 12 internal pressures, when pressure equals in first chamber 11 pressure in second chamber 12, the equation of pressure formation in the movable post 10 automatic closed reflux holes 13, this moment first chamber and second chamber:
P
1×A
1＝P
2×A
2+K×X
P
1The pressure that reducing agent in-the second chamber 12 forms diaphragm 8
P
2The pressure that reducing agent in-the first chamber 11 forms diaphragm 8
A
1-the second chamber 12 interior diaphragms, 8 compression areas
A
2-the first chamber 11 interior diaphragms, 8 compression areas
The spring rate of K-elastic element 9
The spring predeformation amount of X-elastic element 9
Because A
1, A
2, F
3With K, X be definite value, so P
1-P
2Be definite value.
Because pressure regulator valve first chamber 11 is communicated with by pipeline 7-3 with mixing chamber 6, second chamber 12 is communicated with by pipeline 7-4 with metered injection device 5, so the pressure difference Δ P that the air pressure in the hydraulic pressure of metered injection device 5 upstreams and the mixing chamber 6 forms is P
1-P
2Value, therefore, the pressure difference when pressure regulator valve 3 has been stablized 5 injections of metered injection device by automatic adjusting, an elasticity coefficient that only needs to change elastic element 9 is provided with different pressure differences.
Therefore whole ejecting system only needs to control interior emitted dose of unit time by control pulsewidth (promptly spraying duration), reaches accurate control effect.
Simultaneously, the P that senses by pressure transducer 25
1Value also can be predicted the crystallization blockage of pipeline in the whole system, promptly shows by DCU, if P
1Be worth excessively,, then can predict the pressure P in metered injection device 5 downstreams because Δ P is constant
2Be worth too highly, promptly the crystallization blocking phenomenon may occur in the pipeline in metered injection device 5 downstreams or the mixing chamber 6, can take to clean measure accordingly, prevent that congestion affects jeting effect and " big back pressure " environment from damaging pipe-line system down.
Fig. 4, Fig. 5 is the utility model embodiment two schematic representation, described pressure regulator valve 3 and described metered injection device 5 are connected in parallel on the pipeline in described pump motor assembly 2 downstreams, described pressure regulator valve 3 is three hole structures, the liquid entering hole 16 and the liquid outlet 17 that are about to connection second chamber 12 in the above preferred embodiment are merged into hydraulic regulation inlet 20, described pipeline 7-1 pipeline 7-4 direct and metered injection device 5 upstreams are communicated with, form three-way pipeline, promptly, described pressure regulator valve second chamber 12 is communicated with pipeline 7-1 and pipeline 7-4 respectively by hydraulic regulation inlet 20, and this control mode can form the hydraulic pressure P of metered injection device 5 upstreams
1Form feedback with the hydraulic pressure in described second chamber 12, other structure is the same with above preferred embodiment, and control principle is the same, and can reach same control effect, does not repeat them here.
To sum up, the design of the utility model constant voltage type metering injection system is ingenious, simple in structure, control is convenient, do not need to use a plurality of pressure transducers, save cost, pressure difference by the stable metering injection apparatus of being provided with of pressure regulator valve upstream and downstream, the pulsewidth (injection interval) that only needs to control the dosage injection apparatus is controlled emitted dose, reaches the effect of accurate control, can survey the crystalline condition of pipeline simultaneously.
In this specification, the utility model is described with reference to its certain embodiments.But, still can make various modifications and conversion obviously and do not deviate from spirit and scope of the present utility model, therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (9)
1. constant voltage type metering injection system, comprise liquid tank, pump motor assembly, metered injection device and mixing chamber, described liquid tank, pump motor assembly, metered injection device and mixing chamber pipeline successively are connected, it is characterized in that: described constant voltage type metering injection system also comprises pressure regulator valve, described pressure regulator valve is connected between described pump motor assembly and the described metered injection device, perhaps, described pressure regulator valve and described metered injection device are connected in parallel on the downstream of described pump motor assembly.
2. constant voltage type metering injection system according to claim 1, it is characterized in that: described pressure regulator valve comprises diaphragm and is arranged on the elastic element and the movable post of diaphragm both sides, described diaphragm is divided into described pressure regulator valve in first chamber and second chamber of mutual sealing, described elastic element is arranged in first chamber, one end is against described diaphragm, and the fixedly connected described pressure regulator valve of the other end first chamber is away from an end of described diaphragm; Described movable post one end is against described diaphragm, the described movable post the other end in described pressure regulator valve second chamber away from an end of described diaphragm.
3. constant voltage type metering injection system according to claim 2 is characterized in that: the end away from described diaphragm in described pressure regulator valve second chamber is provided with a refluxing opening, and described refluxing opening is by described movable post sealing.
4. constant voltage type metering injection system according to claim 3, it is characterized in that: described pressure regulator valve and described liquid tank pipeline connection, one end of described pipeline is arranged on reducing agent liquid level upside in the described liquid tank, and the other end of described pipeline is communicated with described pressure regulator valve second chamber by described refluxing opening.
5. constant voltage type metering injection system according to claim 2, it is characterized in that: described elastic element by pressure strip against described diaphragm, the end plate that described movable post is wholely set by its top is against described diaphragm, and described pressure strip and end plate can slide up and down in described first chamber and second chamber respectively.
6. according to claim 1 or the described constant voltage type of claim 2 metering injection system, it is characterized in that: described pressure regulator valve first chamber is communicated with described mixing chamber pipeline.
7. according to claim 1 or the described constant voltage type of claim 2 metering injection system, it is characterized in that: described pressure regulator valve by second chamber respectively with described pump motor assembly and described metered injection device pipeline connection.
8. constant voltage type metering injection system according to claim 1 is characterized in that: series connection one pressure transducer between described pressure regulator valve and the described metered injection device.
9. according to the described constant voltage type of the arbitrary claim metering injection system in the aforementioned claim, it is characterized in that: described pressure regulator valve periphery is provided with an electromagnetic coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020265501XU CN201738998U (en) | 2010-07-21 | 2010-07-21 | Constant-pressure metered jetting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020265501XU CN201738998U (en) | 2010-07-21 | 2010-07-21 | Constant-pressure metered jetting system |
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| Publication Number | Publication Date |
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| CN201738998U true CN201738998U (en) | 2011-02-09 |
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|---|---|---|---|
| CN201020265501XU Expired - Lifetime CN201738998U (en) | 2010-07-21 | 2010-07-21 | Constant-pressure metered jetting system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116188A (en) * | 2010-07-21 | 2011-07-06 | 苏州派格力减排系统有限公司 | Constant-pressure type metering injection system |
| CN102357439A (en) * | 2011-10-28 | 2012-02-22 | 中国农业科学院农田灌溉研究所 | fluid pulse spraying device |
| CN106555646A (en) * | 2016-11-16 | 2017-04-05 | 中国北方发动机研究所(天津) | A kind of metering atomising spraying system of SCR |
| CN112024153A (en) * | 2020-09-18 | 2020-12-04 | 北京瑞奎德工业技术有限公司 | Extensible gas-liquid mixed spraying device and gas-liquid mixed spraying system |
| CN112024310A (en) * | 2020-07-31 | 2020-12-04 | 中国科学院微电子研究所 | Control method and control system of glue spreader |
-
2010
- 2010-07-21 CN CN201020265501XU patent/CN201738998U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116188A (en) * | 2010-07-21 | 2011-07-06 | 苏州派格力减排系统有限公司 | Constant-pressure type metering injection system |
| CN102116188B (en) * | 2010-07-21 | 2013-01-09 | 苏州派格力减排系统有限公司 | Constant-pressure type metering injection system |
| CN102357439A (en) * | 2011-10-28 | 2012-02-22 | 中国农业科学院农田灌溉研究所 | fluid pulse spraying device |
| CN106555646A (en) * | 2016-11-16 | 2017-04-05 | 中国北方发动机研究所(天津) | A kind of metering atomising spraying system of SCR |
| CN106555646B (en) * | 2016-11-16 | 2018-08-10 | 中国北方发动机研究所(天津) | A kind of metering atomising spraying systems of SCR |
| CN112024310A (en) * | 2020-07-31 | 2020-12-04 | 中国科学院微电子研究所 | Control method and control system of glue spreader |
| CN112024153A (en) * | 2020-09-18 | 2020-12-04 | 北京瑞奎德工业技术有限公司 | Extensible gas-liquid mixed spraying device and gas-liquid mixed spraying system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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. |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20110209 Effective date of abandoning: 20130306 |
|
| RGAV | Abandon patent right to avoid regrant |